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- 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN

Browse Source 
walkers") is known to cause a performance regression
   (https://lore.kernel.org/all/3acefad9-96e5-4681-8014-827d6be71c7a@linux.ibm.com/T/#mfa809800a7862fb5bdf834c6f71a3a5113eb83ff).
   Yu has a fix which I'll send along later via the hotfixes branch.
 
 - In the series "mm: Avoid possible overflows in dirty throttling" Jan
   Kara addresses a couple of issues in the writeback throttling code.
   These fixes are also targetted at -stable kernels.
 
 - Ryusuke Konishi's series "nilfs2: fix potential issues related to
   reserved inodes" does that.  This should actually be in the
   mm-nonmm-stable tree, along with the many other nilfs2 patches.  My bad.
 
 - More folio conversions from Kefeng Wang in the series "mm: convert to
   folio_alloc_mpol()"
 
 - Kemeng Shi has sent some cleanups to the writeback code in the series
   "Add helper functions to remove repeated code and improve readability of
   cgroup writeback"
 
 - Kairui Song has made the swap code a little smaller and a little
   faster in the series "mm/swap: clean up and optimize swap cache index".
 
 - In the series "mm/memory: cleanly support zeropage in
   vm_insert_page*(), vm_map_pages*() and vmf_insert_mixed()" David
   Hildenbrand has reworked the rather sketchy handling of the use of the
   zeropage in MAP_SHARED mappings.  I don't see any runtime effects here -
   more a cleanup/understandability/maintainablity thing.
 
 - Dev Jain has improved selftests/mm/va_high_addr_switch.c's handling of
   higher addresses, for aarch64.  The (poorly named) series is
   "Restructure va_high_addr_switch".
 
 - The core TLB handling code gets some cleanups and possible slight
   optimizations in Bang Li's series "Add update_mmu_tlb_range() to
   simplify code".
 
 - Jane Chu has improved the handling of our
   fake-an-unrecoverable-memory-error testing feature MADV_HWPOISON in the
   series "Enhance soft hwpoison handling and injection".
 
 - Jeff Johnson has sent a billion patches everywhere to add
   MODULE_DESCRIPTION() to everything.  Some landed in this pull.
 
 - In the series "mm: cleanup MIGRATE_SYNC_NO_COPY mode", Kefeng Wang has
   simplified migration's use of hardware-offload memory copying.
 
 - Yosry Ahmed performs more folio API conversions in his series "mm:
   zswap: trivial folio conversions".
 
 - In the series "large folios swap-in: handle refault cases first",
   Chuanhua Han inches us forward in the handling of large pages in the
   swap code.  This is a cleanup and optimization, working toward the end
   objective of full support of large folio swapin/out.
 
 - In the series "mm,swap: cleanup VMA based swap readahead window
   calculation", Huang Ying has contributed some cleanups and a possible
   fixlet to his VMA based swap readahead code.
 
 - In the series "add mTHP support for anonymous shmem" Baolin Wang has
   taught anonymous shmem mappings to use multisize THP.  By default this
   is a no-op - users must opt in vis sysfs controls.  Dramatic
   improvements in pagefault latency are realized.
 
 - David Hildenbrand has some cleanups to our remaining use of
   page_mapcount() in the series "fs/proc: move page_mapcount() to
   fs/proc/internal.h".
 
 - David also has some highmem accounting cleanups in the series
   "mm/highmem: don't track highmem pages manually".
 
 - Build-time fixes and cleanups from John Hubbard in the series
   "cleanups, fixes, and progress towards avoiding "make headers"".
 
 - Cleanups and consolidation of the core pagemap handling from Barry
   Song in the series "mm: introduce pmd|pte_needs_soft_dirty_wp helpers
   and utilize them".
 
 - Lance Yang's series "Reclaim lazyfree THP without splitting" has
   reduced the latency of the reclaim of pmd-mapped THPs under fairly
   common circumstances.  A 10x speedup is seen in a microbenchmark.
 
   It does this by punting to aother CPU but I guess that's a win unless
   all CPUs are pegged.
 
 - hugetlb_cgroup cleanups from Xiu Jianfeng in the series
   "mm/hugetlb_cgroup: rework on cftypes".
 
 - Miaohe Lin's series "Some cleanups for memory-failure" does just that
   thing.
 
 - Is anyone reading this stuff?  If so, email me!
 
 - Someone other than SeongJae has developed a DAMON feature in Honggyu
   Kim's series "DAMON based tiered memory management for CXL memory".
   This adds DAMON features which may be used to help determine the
   efficiency of our placement of CXL/PCIe attached DRAM.
 
 - DAMON user API centralization and simplificatio work in SeongJae
   Park's series "mm/damon: introduce DAMON parameters online commit
   function".
 
 - In the series "mm: page_type, zsmalloc and page_mapcount_reset()"
   David Hildenbrand does some maintenance work on zsmalloc - partially
   modernizing its use of pageframe fields.
 
 - Kefeng Wang provides more folio conversions in the series "mm: remove
   page_maybe_dma_pinned() and page_mkclean()".
 
 - More cleanup from David Hildenbrand, this time in the series
   "mm/memory_hotplug: use PageOffline() instead of PageReserved() for
   !ZONE_DEVICE".  It "enlightens memory hotplug more about PageOffline()
   pages" and permits the removal of some virtio-mem hacks.
 
 - Barry Song's series "mm: clarify folio_add_new_anon_rmap() and
   __folio_add_anon_rmap()" is a cleanup to the anon folio handling in
   preparation for mTHP (multisize THP) swapin.
 
 - Kefeng Wang's series "mm: improve clear and copy user folio"
   implements more folio conversions, this time in the area of large folio
   userspace copying.
 
 - The series "Docs/mm/damon/maintaier-profile: document a mailing tool
   and community meetup series" tells people how to get better involved
   with other DAMON developers.  From SeongJae Park.
 
 - A large series ("kmsan: Enable on s390") from Ilya Leoshkevich does
   that.
 
 - David Hildenbrand sends along more cleanups, this time against the
   migration code.  The series is "mm/migrate: move NUMA hinting fault
   folio isolation + checks under PTL".
 
 - Jan Kara has found quite a lot of strangenesses and minor errors in
   the readahead code.  He addresses this in the series "mm: Fix various
   readahead quirks".
 
 - SeongJae Park's series "selftests/damon: test DAMOS tried regions and
   {min,max}_nr_regions" adds features and addresses errors in DAMON's self
   testing code.
 
 - Gavin Shan has found a userspace-triggerable WARN in the pagecache
   code.  The series "mm/filemap: Limit page cache size to that supported
   by xarray" addresses this.  The series is marked cc:stable.
 
 - Chengming Zhou's series "mm/ksm: cmp_and_merge_page() optimizations
   and cleanup" cleans up and slightly optimizes KSM.
 
 - Roman Gushchin has separated the memcg-v1 and memcg-v2 code - lots of
   code motion.  The series (which also makes the memcg-v1 code
   Kconfigurable) are
 
   "mm: memcg: separate legacy cgroup v1 code and put under config
   option" and
   "mm: memcg: put cgroup v1-specific memcg data under CONFIG_MEMCG_V1"
 
 - Dan Schatzberg's series "Add swappiness argument to memory.reclaim"
   adds an additional feature to this cgroup-v2 control file.
 
 - The series "Userspace controls soft-offline pages" from Jiaqi Yan
   permits userspace to stop the kernel's automatic treatment of excessive
   correctable memory errors.  In order to permit userspace to monitor and
   handle this situation.
 
 - Kefeng Wang's series "mm: migrate: support poison recover from migrate
   folio" teaches the kernel to appropriately handle migration from
   poisoned source folios rather than simply panicing.
 
 - SeongJae Park's series "Docs/damon: minor fixups and improvements"
   does those things.
 
 - In the series "mm/zsmalloc: change back to per-size_class lock"
   Chengming Zhou improves zsmalloc's scalability and memory utilization.
 
 - Vivek Kasireddy's series "mm/gup: Introduce memfd_pin_folios() for
   pinning memfd folios" makes the GUP code use FOLL_PIN rather than bare
   refcount increments.  So these paes can first be moved aside if they
   reside in the movable zone or a CMA block.
 
 - Andrii Nakryiko has added a binary ioctl()-based API to /proc/pid/maps
   for much faster reading of vma information.  The series is "query VMAs
   from /proc/<pid>/maps".
 
 - In the series "mm: introduce per-order mTHP split counters" Lance Yang
   improves the kernel's presentation of developer information related to
   multisize THP splitting.
 
 - Michael Ellerman has developed the series "Reimplement huge pages
   without hugepd on powerpc (8xx, e500, book3s/64)".  This permits
   userspace to use all available huge page sizes.
 
 - In the series "revert unconditional slab and page allocator fault
   injection calls" Vlastimil Babka removes a performance-affecting and not
   very useful feature from slab fault injection.
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Merge tag 'mm-stable-2024-07-21-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - In the series "mm: Avoid possible overflows in dirty throttling" Jan
   Kara addresses a couple of issues in the writeback throttling code.
   These fixes are also targetted at -stable kernels.

 - Ryusuke Konishi's series "nilfs2: fix potential issues related to
   reserved inodes" does that. This should actually be in the
   mm-nonmm-stable tree, along with the many other nilfs2 patches. My
   bad.

 - More folio conversions from Kefeng Wang in the series "mm: convert to
   folio_alloc_mpol()"

 - Kemeng Shi has sent some cleanups to the writeback code in the series
   "Add helper functions to remove repeated code and improve readability
   of cgroup writeback"

 - Kairui Song has made the swap code a little smaller and a little
   faster in the series "mm/swap: clean up and optimize swap cache
   index".

 - In the series "mm/memory: cleanly support zeropage in
   vm_insert_page*(), vm_map_pages*() and vmf_insert_mixed()" David
   Hildenbrand has reworked the rather sketchy handling of the use of
   the zeropage in MAP_SHARED mappings. I don't see any runtime effects
   here - more a cleanup/understandability/maintainablity thing.

 - Dev Jain has improved selftests/mm/va_high_addr_switch.c's handling
   of higher addresses, for aarch64. The (poorly named) series is
   "Restructure va_high_addr_switch".

 - The core TLB handling code gets some cleanups and possible slight
   optimizations in Bang Li's series "Add update_mmu_tlb_range() to
   simplify code".

 - Jane Chu has improved the handling of our
   fake-an-unrecoverable-memory-error testing feature MADV_HWPOISON in
   the series "Enhance soft hwpoison handling and injection".

 - Jeff Johnson has sent a billion patches everywhere to add
   MODULE_DESCRIPTION() to everything. Some landed in this pull.

 - In the series "mm: cleanup MIGRATE_SYNC_NO_COPY mode", Kefeng Wang
   has simplified migration's use of hardware-offload memory copying.

 - Yosry Ahmed performs more folio API conversions in his series "mm:
   zswap: trivial folio conversions".

 - In the series "large folios swap-in: handle refault cases first",
   Chuanhua Han inches us forward in the handling of large pages in the
   swap code. This is a cleanup and optimization, working toward the end
   objective of full support of large folio swapin/out.

 - In the series "mm,swap: cleanup VMA based swap readahead window
   calculation", Huang Ying has contributed some cleanups and a possible
   fixlet to his VMA based swap readahead code.

 - In the series "add mTHP support for anonymous shmem" Baolin Wang has
   taught anonymous shmem mappings to use multisize THP. By default this
   is a no-op - users must opt in vis sysfs controls. Dramatic
   improvements in pagefault latency are realized.

 - David Hildenbrand has some cleanups to our remaining use of
   page_mapcount() in the series "fs/proc: move page_mapcount() to
   fs/proc/internal.h".

 - David also has some highmem accounting cleanups in the series
   "mm/highmem: don't track highmem pages manually".

 - Build-time fixes and cleanups from John Hubbard in the series
   "cleanups, fixes, and progress towards avoiding "make headers"".

 - Cleanups and consolidation of the core pagemap handling from Barry
   Song in the series "mm: introduce pmd|pte_needs_soft_dirty_wp helpers
   and utilize them".

 - Lance Yang's series "Reclaim lazyfree THP without splitting" has
   reduced the latency of the reclaim of pmd-mapped THPs under fairly
   common circumstances. A 10x speedup is seen in a microbenchmark.

   It does this by punting to aother CPU but I guess that's a win unless
   all CPUs are pegged.

 - hugetlb_cgroup cleanups from Xiu Jianfeng in the series
   "mm/hugetlb_cgroup: rework on cftypes".

 - Miaohe Lin's series "Some cleanups for memory-failure" does just that
   thing.

 - Someone other than SeongJae has developed a DAMON feature in Honggyu
   Kim's series "DAMON based tiered memory management for CXL memory".
   This adds DAMON features which may be used to help determine the
   efficiency of our placement of CXL/PCIe attached DRAM.

 - DAMON user API centralization and simplificatio work in SeongJae
   Park's series "mm/damon: introduce DAMON parameters online commit
   function".

 - In the series "mm: page_type, zsmalloc and page_mapcount_reset()"
   David Hildenbrand does some maintenance work on zsmalloc - partially
   modernizing its use of pageframe fields.

 - Kefeng Wang provides more folio conversions in the series "mm: remove
   page_maybe_dma_pinned() and page_mkclean()".

 - More cleanup from David Hildenbrand, this time in the series
   "mm/memory_hotplug: use PageOffline() instead of PageReserved() for
   !ZONE_DEVICE". It "enlightens memory hotplug more about PageOffline()
   pages" and permits the removal of some virtio-mem hacks.

 - Barry Song's series "mm: clarify folio_add_new_anon_rmap() and
   __folio_add_anon_rmap()" is a cleanup to the anon folio handling in
   preparation for mTHP (multisize THP) swapin.

 - Kefeng Wang's series "mm: improve clear and copy user folio"
   implements more folio conversions, this time in the area of large
   folio userspace copying.

 - The series "Docs/mm/damon/maintaier-profile: document a mailing tool
   and community meetup series" tells people how to get better involved
   with other DAMON developers. From SeongJae Park.

 - A large series ("kmsan: Enable on s390") from Ilya Leoshkevich does
   that.

 - David Hildenbrand sends along more cleanups, this time against the
   migration code. The series is "mm/migrate: move NUMA hinting fault
   folio isolation + checks under PTL".

 - Jan Kara has found quite a lot of strangenesses and minor errors in
   the readahead code. He addresses this in the series "mm: Fix various
   readahead quirks".

 - SeongJae Park's series "selftests/damon: test DAMOS tried regions and
   {min,max}_nr_regions" adds features and addresses errors in DAMON's
   self testing code.

 - Gavin Shan has found a userspace-triggerable WARN in the pagecache
   code. The series "mm/filemap: Limit page cache size to that supported
   by xarray" addresses this. The series is marked cc:stable.

 - Chengming Zhou's series "mm/ksm: cmp_and_merge_page() optimizations
   and cleanup" cleans up and slightly optimizes KSM.

 - Roman Gushchin has separated the memcg-v1 and memcg-v2 code - lots of
   code motion. The series (which also makes the memcg-v1 code
   Kconfigurable) are "mm: memcg: separate legacy cgroup v1 code and put
   under config option" and "mm: memcg: put cgroup v1-specific memcg
   data under CONFIG_MEMCG_V1"

 - Dan Schatzberg's series "Add swappiness argument to memory.reclaim"
   adds an additional feature to this cgroup-v2 control file.

 - The series "Userspace controls soft-offline pages" from Jiaqi Yan
   permits userspace to stop the kernel's automatic treatment of
   excessive correctable memory errors. In order to permit userspace to
   monitor and handle this situation.

 - Kefeng Wang's series "mm: migrate: support poison recover from
   migrate folio" teaches the kernel to appropriately handle migration
   from poisoned source folios rather than simply panicing.

 - SeongJae Park's series "Docs/damon: minor fixups and improvements"
   does those things.

 - In the series "mm/zsmalloc: change back to per-size_class lock"
   Chengming Zhou improves zsmalloc's scalability and memory
   utilization.

 - Vivek Kasireddy's series "mm/gup: Introduce memfd_pin_folios() for
   pinning memfd folios" makes the GUP code use FOLL_PIN rather than
   bare refcount increments. So these paes can first be moved aside if
   they reside in the movable zone or a CMA block.

 - Andrii Nakryiko has added a binary ioctl()-based API to
   /proc/pid/maps for much faster reading of vma information. The series
   is "query VMAs from /proc/<pid>/maps".

 - In the series "mm: introduce per-order mTHP split counters" Lance
   Yang improves the kernel's presentation of developer information
   related to multisize THP splitting.

 - Michael Ellerman has developed the series "Reimplement huge pages
   without hugepd on powerpc (8xx, e500, book3s/64)". This permits
   userspace to use all available huge page sizes.

 - In the series "revert unconditional slab and page allocator fault
   injection calls" Vlastimil Babka removes a performance-affecting and
   not very useful feature from slab fault injection.

* tag 'mm-stable-2024-07-21-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (411 commits)
  mm/mglru: fix ineffective protection calculation
  mm/zswap: fix a white space issue
  mm/hugetlb: fix kernel NULL pointer dereference when migrating hugetlb folio
  mm/hugetlb: fix possible recursive locking detected warning
  mm/gup: clear the LRU flag of a page before adding to LRU batch
  mm/numa_balancing: teach mpol_to_str about the balancing mode
  mm: memcg1: convert charge move flags to unsigned long long
  alloc_tag: fix page_ext_get/page_ext_put sequence during page splitting
  lib: reuse page_ext_data() to obtain codetag_ref
  lib: add missing newline character in the warning message
  mm/mglru: fix overshooting shrinker memory
  mm/mglru: fix div-by-zero in vmpressure_calc_level()
  mm/kmemleak: replace strncpy() with strscpy()
  mm, page_alloc: put should_fail_alloc_page() back behing CONFIG_FAIL_PAGE_ALLOC
  mm, slab: put should_failslab() back behind CONFIG_SHOULD_FAILSLAB
  mm: ignore data-race in __swap_writepage
  hugetlbfs: ensure generic_hugetlb_get_unmapped_area() returns higher address than mmap_min_addr
  mm: shmem: rename mTHP shmem counters
  mm: swap_state: use folio_alloc_mpol() in __read_swap_cache_async()
  mm/migrate: putback split folios when numa hint migration fails
  ...
This commit is contained in:
Linus Torvalds 2024-07-21 17:15:46 -07:00
commit fbc90c042c
328 changed files with 12459 additions and 9219 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/ABI/testing/sysfs-kernel-mm-damon
View File

@ -155,6 +155,12 @@ Contact: SeongJae Park <sj@kernel.org>
Description: Writing to and reading from this file sets and gets the action
of the scheme.
What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/target_nid
Date: Jun 2024
Contact: SeongJae Park <sj@kernel.org>
Description: Action's target NUMA node id. Supported by only relevant
actions.
What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/apply_interval_us
Date: Sep 2023
Contact: SeongJae Park <sj@kernel.org>

18
Documentation/admin-guide/cgroup-v2.rst
View File

@ -1306,17 +1306,10 @@ PAGE_SIZE multiple when read back.
This is a simple interface to trigger memory reclaim in the
target cgroup.
This file accepts a single key, the number of bytes to reclaim.
No nested keys are currently supported.
Example::
echo "1G" > memory.reclaim
The interface can be later extended with nested keys to
configure the reclaim behavior. For example, specify the
type of memory to reclaim from (anon, file, ..).
Please note that the kernel can over or under reclaim from
the target cgroup. If less bytes are reclaimed than the
specified amount, -EAGAIN is returned.
@ -1328,6 +1321,17 @@ PAGE_SIZE multiple when read back.
This means that the networking layer will not adapt based on
reclaim induced by memory.reclaim.
The following nested keys are defined.
========== ================================
swappiness Swappiness value to reclaim with
========== ================================
Specifying a swappiness value instructs the kernel to perform
the reclaim with that swappiness value. Note that this has the
same semantics as vm.swappiness applied to memcg reclaim with
all the existing limitations and potential future extensions.
memory.peak
A read-only single value file which exists on non-root
cgroups.

9
Documentation/admin-guide/kernel-parameters.txt
View File

@ -7239,9 +7239,12 @@
vmalloc=nn[KMG] [KNL,BOOT,EARLY] Forces the vmalloc area to have an
exact size of <nn>. This can be used to increase
the minimum size (128MB on x86). It can also be
used to decrease the size and leave more room
for directly mapped kernel RAM.
the minimum size (128MB on x86, arm32 platforms).
It can also be used to decrease the size and leave more room
for directly mapped kernel RAM. Note that this parameter does
not exist on many other platforms (including arm64, alpha,
loongarch, arc, csky, hexagon, microblaze, mips, nios2, openrisc,
parisc, m64k, powerpc, riscv, sh, um, xtensa, s390, sparc).
vmcp_cma=nn[MG] [KNL,S390,EARLY]
Sets the memory size reserved for contiguous memory

46
Documentation/admin-guide/mm/damon/start.rst
View File

@ -34,18 +34,56 @@ detail) of DAMON, you should ensure :doc:`sysfs </filesystems/sysfs>` is
mounted.
Snapshot Data Access Patterns
=============================
The commands below show the memory access pattern of a program at the moment of
the execution. ::
$ git clone https://github.com/sjp38/masim; cd masim; make
$ sudo damo start "./masim ./configs/stairs.cfg --quiet"
$ sudo ./damo show
0 addr [85.541 TiB , 85.541 TiB ) (57.707 MiB ) access 0 % age 10.400 s
1 addr [85.541 TiB , 85.542 TiB ) (413.285 MiB) access 0 % age 11.400 s
2 addr [127.649 TiB , 127.649 TiB) (57.500 MiB ) access 0 % age 1.600 s
3 addr [127.649 TiB , 127.649 TiB) (32.500 MiB ) access 0 % age 500 ms
4 addr [127.649 TiB , 127.649 TiB) (9.535 MiB ) access 100 % age 300 ms
5 addr [127.649 TiB , 127.649 TiB) (8.000 KiB ) access 60 % age 0 ns
6 addr [127.649 TiB , 127.649 TiB) (6.926 MiB ) access 0 % age 1 s
7 addr [127.998 TiB , 127.998 TiB) (120.000 KiB) access 0 % age 11.100 s
8 addr [127.998 TiB , 127.998 TiB) (8.000 KiB ) access 40 % age 100 ms
9 addr [127.998 TiB , 127.998 TiB) (4.000 KiB ) access 0 % age 11 s
total size: 577.590 MiB
$ sudo ./damo stop
The first command of the above example downloads and builds an artificial
memory access generator program called ``masim``. The second command asks DAMO
to execute the artificial generator process start via the given command and
make DAMON monitors the generator process. The third command retrieves the
current snapshot of the monitored access pattern of the process from DAMON and
shows the pattern in a human readable format.
Each line of the output shows which virtual address range (``addr [XX, XX)``)
of the process is how frequently (``access XX %``) accessed for how long time
(``age XX``). For example, the fifth region of ~9 MiB size is being most
frequently accessed for last 300 milliseconds. Finally, the fourth command
stops DAMON.
Note that DAMON can monitor not only virtual address spaces but multiple types
of address spaces including the physical address space.
Recording Data Access Patterns
==============================
The commands below record the memory access patterns of a program and save the
monitoring results to a file. ::
$ git clone https://github.com/sjp38/masim
$ cd masim; make; ./masim ./configs/zigzag.cfg &
$ ./masim ./configs/zigzag.cfg &
$ sudo damo record -o damon.data $(pidof masim)
The first two lines of the commands download an artificial memory access
generator program and run it in the background. The generator will repeatedly
The line of the commands run the artificial memory access
generator program again. The generator will repeatedly
access two 100 MiB sized memory regions one by one. You can substitute this
with your real workload. The last line asks ``damo`` to record the access
pattern in the ``damon.data`` file.

10
Documentation/admin-guide/mm/damon/usage.rst
View File

@ -78,7 +78,7 @@ comma (",").
│ │ │ │ │ │ │ │ ...
│ │ │ │ │ │ ...
│ │ │ │ │ :ref:`schemes <sysfs_schemes>`/nr_schemes
│ │ │ │ │ │ :ref:`0 <sysfs_scheme>`/action,apply_interval_us
│ │ │ │ │ │ :ref:`0 <sysfs_scheme>`/action,target_nid,apply_interval_us
│ │ │ │ │ │ │ :ref:`access_pattern <sysfs_access_pattern>`/
│ │ │ │ │ │ │ │ sz/min,max
│ │ │ │ │ │ │ │ nr_accesses/min,max
@ -289,14 +289,18 @@ schemes/<N>/
------------
In each scheme directory, five directories (``access_pattern``, ``quotas``,
``watermarks``, ``filters``, ``stats``, and ``tried_regions``) and two files
(``action`` and ``apply_interval``) exist.
``watermarks``, ``filters``, ``stats``, and ``tried_regions``) and three files
(``action``, ``target_nid`` and ``apply_interval``) exist.
The ``action`` file is for setting and getting the scheme's :ref:`action
<damon_design_damos_action>`. The keywords that can be written to and read
from the file and their meaning are same to those of the list on
:ref:`design doc <damon_design_damos_action>`.
The ``target_nid`` file is for setting the migration target node, which is
only meaningful when the ``action`` is either ``migrate_hot`` or
``migrate_cold``.
The ``apply_interval_us`` file is for setting and getting the scheme's
:ref:`apply_interval <damon_design_damos>` in microseconds.

25
Documentation/admin-guide/mm/pagemap.rst
View File

@ -118,7 +118,7 @@ Short descriptions to the page flags
21 - KSM
Identical memory pages dynamically shared between one or more processes.
22 - THP
Contiguous pages which construct transparent hugepages.
Contiguous pages which construct THP of any size and mapped by any granularity.
23 - OFFLINE
The page is logically offline.
24 - ZERO_PAGE
@ -173,27 +173,6 @@ LRU related page flags
The page-types tool in the tools/mm directory can be used to query the
above flags.
Using pagemap to do something useful
====================================
The general procedure for using pagemap to find out about a process' memory
usage goes like this:
1. Read ``/proc/pid/maps`` to determine which parts of the memory space are
mapped to what.
2. Select the maps you are interested in -- all of them, or a particular
library, or the stack or the heap, etc.
3. Open ``/proc/pid/pagemap`` and seek to the pages you would like to examine.
4. Read a u64 for each page from pagemap.
5. Open ``/proc/kpagecount`` and/or ``/proc/kpageflags``. For each PFN you
just read, seek to that entry in the file, and read the data you want.
For example, to find the "unique set size" (USS), which is the amount of
memory that a process is using that is not shared with any other process,
you can go through every map in the process, find the PFNs, look those up
in kpagecount, and tally up the number of pages that are only referenced
once.
Exceptions for Shared Memory
============================
@ -252,7 +231,7 @@ Following flags about pages are currently supported:
- ``PAGE_IS_PRESENT`` - Page is present in the memory
- ``PAGE_IS_SWAPPED`` - Page is in swapped
- ``PAGE_IS_PFNZERO`` - Page has zero PFN
- ``PAGE_IS_HUGE`` - Page is THP or Hugetlb backed
- ``PAGE_IS_HUGE`` - Page is PMD-mapped THP or Hugetlb backed
- ``PAGE_IS_SOFT_DIRTY`` - Page is soft-dirty
The ``struct pm_scan_arg`` is used as the argument of the IOCTL.

85
Documentation/admin-guide/mm/transhuge.rst
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@ -202,12 +202,11 @@ PMD-mappable transparent hugepage::
cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size
khugepaged will be automatically started when one or more hugepage
sizes are enabled (either by directly setting "always" or "madvise",
or by setting "inherit" while the top-level enabled is set to "always"
or "madvise"), and it'll be automatically shutdown when the last
hugepage size is disabled (either by directly setting "never", or by
setting "inherit" while the top-level enabled is set to "never").
khugepaged will be automatically started when PMD-sized THP is enabled
(either of the per-size anon control or the top-level control are set
to "always" or "madvise"), and it'll be automatically shutdown when
PMD-sized THP is disabled (when both the per-size anon control and the
top-level control are "never")
Khugepaged controls
-------------------
@ -332,6 +331,31 @@ deny
force
Force the huge option on for all - very useful for testing;
Shmem can also use "multi-size THP" (mTHP) by adding a new sysfs knob to
control mTHP allocation:
'/sys/kernel/mm/transparent_hugepage/hugepages-<size>kB/shmem_enabled',
and its value for each mTHP is essentially consistent with the global
setting. An 'inherit' option is added to ensure compatibility with these
global settings. Conversely, the options 'force' and 'deny' are dropped,
which are rather testing artifacts from the old ages.
always
Attempt to allocate <size> huge pages every time we need a new page;
inherit
Inherit the top-level "shmem_enabled" value. By default, PMD-sized hugepages
have enabled="inherit" and all other hugepage sizes have enabled="never";
never
Do not allocate <size> huge pages;
within_size
Only allocate <size> huge page if it will be fully within i_size.
Also respect fadvise()/madvise() hints;
advise
Only allocate <size> huge pages if requested with fadvise()/madvise();
Need of application restart
===========================
@ -344,10 +368,6 @@ also applies to the regions registered in khugepaged.
Monitoring usage
================
.. note::
Currently the below counters only record events relating to
PMD-sized THP. Events relating to other THP sizes are not included.
The number of PMD-sized anonymous transparent huge pages currently used by the
system is available by reading the AnonHugePages field in ``/proc/meminfo``.
To identify what applications are using PMD-sized anonymous transparent huge
@ -392,20 +412,23 @@ thp_collapse_alloc_failed
the allocation.
thp_file_alloc
is incremented every time a file huge page is successfully
allocated.
is incremented every time a shmem huge page is successfully
allocated (Note that despite being named after "file", the counter
measures only shmem).
thp_file_fallback
is incremented if a file huge page is attempted to be allocated
but fails and instead falls back to using small pages.
is incremented if a shmem huge page is attempted to be allocated
but fails and instead falls back to using small pages. (Note that
despite being named after "file", the counter measures only shmem).
thp_file_fallback_charge
is incremented if a file huge page cannot be charged and instead
is incremented if a shmem huge page cannot be charged and instead
falls back to using small pages even though the allocation was
successful.
successful. (Note that despite being named after "file", the
counter measures only shmem).
thp_file_mapped
is incremented every time a file huge page is mapped into
is incremented every time a file or shmem huge page is mapped into
user address space.
thp_split_page
@ -476,6 +499,34 @@ swpout_fallback
Usually because failed to allocate some continuous swap space
for the huge page.
shmem_alloc
is incremented every time a shmem huge page is successfully
allocated.
shmem_fallback
is incremented if a shmem huge page is attempted to be allocated
but fails and instead falls back to using small pages.
shmem_fallback_charge
is incremented if a shmem huge page cannot be charged and instead
falls back to using small pages even though the allocation was
successful.
split
is incremented every time a huge page is successfully split into
smaller orders. This can happen for a variety of reasons but a
common reason is that a huge page is old and is being reclaimed.
split_failed
is incremented if kernel fails to split huge
page. This can happen if the page was pinned by somebody.
split_deferred
is incremented when a huge page is put onto split queue.
This happens when a huge page is partially unmapped and splitting
it would free up some memory. Pages on split queue are going to
be split under memory pressure, if splitting is possible.
As the system ages, allocating huge pages may be expensive as the
system uses memory compaction to copy data around memory to free a
huge page for use. There are some counters in ``/proc/vmstat`` to help

38
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@ -36,6 +36,7 @@ Currently, these files are in /proc/sys/vm:
- dirtytime_expire_seconds
- dirty_writeback_centisecs
- drop_caches
- enable_soft_offline
- extfrag_threshold
- highmem_is_dirtyable
- hugetlb_shm_group
@ -267,6 +268,43 @@ used::
These are informational only. They do not mean that anything is wrong
with your system. To disable them, echo 4 (bit 2) into drop_caches.
enable_soft_offline
===================
Correctable memory errors are very common on servers. Soft-offline is kernel's
solution for memory pages having (excessive) corrected memory errors.
For different types of page, soft-offline has different behaviors / costs.
- For a raw error page, soft-offline migrates the in-use page's content to
a new raw page.
- For a page that is part of a transparent hugepage, soft-offline splits the
transparent hugepage into raw pages, then migrates only the raw error page.
As a result, user is transparently backed by 1 less hugepage, impacting
memory access performance.
- For a page that is part of a HugeTLB hugepage, soft-offline first migrates
the entire HugeTLB hugepage, during which a free hugepage will be consumed
as migration target. Then the original hugepage is dissolved into raw
pages without compensation, reducing the capacity of the HugeTLB pool by 1.
It is user's call to choose between reliability (staying away from fragile
physical memory) vs performance / capacity implications in transparent and
HugeTLB cases.
For all architectures, enable_soft_offline controls whether to soft offline
memory pages. When set to 1, kernel attempts to soft offline the pages
whenever it thinks needed. When set to 0, kernel returns EOPNOTSUPP to
the request to soft offline the pages. Its default value is 1.
It is worth mentioning that after setting enable_soft_offline to 0, the
following requests to soft offline pages will not be performed:
- Request to soft offline pages from RAS Correctable Errors Collector.
- On ARM, the request to soft offline pages from GHES driver.
- On PARISC, the request to soft offline pages from Page Deallocation Table.
extfrag_threshold
=================

18
Documentation/core-api/pin_user_pages.rst
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@ -132,7 +132,7 @@ CASE 1: Direct IO (DIO)
-----------------------
There are GUP references to pages that are serving
as DIO buffers. These buffers are needed for a relatively short time (so they
are not "long term"). No special synchronization with page_mkclean() or
are not "long term"). No special synchronization with folio_mkclean() or
munmap() is provided. Therefore, flags to set at the call site are: ::
FOLL_PIN
@ -144,7 +144,7 @@ CASE 2: RDMA
------------
There are GUP references to pages that are serving as DMA
buffers. These buffers are needed for a long time ("long term"). No special
synchronization with page_mkclean() or munmap() is provided. Therefore, flags
synchronization with folio_mkclean() or munmap() is provided. Therefore, flags
to set at the call site are: ::
FOLL_PIN | FOLL_LONGTERM
@ -170,7 +170,7 @@ callback, simply remove the range from the device's page tables.
Either way, as long as the driver unpins the pages upon mmu notifier callback,
then there is proper synchronization with both filesystem and mm
(page_mkclean(), munmap(), etc). Therefore, neither flag needs to be set.
(folio_mkclean(), munmap(), etc). Therefore, neither flag needs to be set.
CASE 4: Pinning for struct page manipulation only
-------------------------------------------------
@ -196,20 +196,20 @@ INCORRECT (uses FOLL_GET calls):
write to the data within the pages
put_page()
page_maybe_dma_pinned(): the whole point of pinning
===================================================
folio_maybe_dma_pinned(): the whole point of pinning
====================================================
The whole point of marking pages as "DMA-pinned" or "gup-pinned" is to be able
to query, "is this page DMA-pinned?" That allows code such as page_mkclean()
The whole point of marking folios as "DMA-pinned" or "gup-pinned" is to be able
to query, "is this folio DMA-pinned?" That allows code such as folio_mkclean()
(and file system writeback code in general) to make informed decisions about
what to do when a page cannot be unmapped due to such pins.
what to do when a folio cannot be unmapped due to such pins.
What to do in those cases is the subject of a years-long series of discussions
and debates (see the References at the end of this document). It's a TODO item
here: fill in the details once that's worked out. Meanwhile, it's safe to say
that having this available: ::
static inline bool page_maybe_dma_pinned(struct page *page)
static inline bool folio_maybe_dma_pinned(struct folio *folio)
...is a prerequisite to solving the long-running gup+DMA problem.

11
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@ -110,6 +110,13 @@ in the Makefile. Think of this as applying ``__no_sanitize_memory`` to every
function in the file or directory. Most users won't need KMSAN_SANITIZE, unless
their code gets broken by KMSAN (e.g. runs at early boot time).
KMSAN checks can also be temporarily disabled for the current task using
``kmsan_disable_current()`` and ``kmsan_enable_current()`` calls. Each
``kmsan_enable_current()`` call must be preceded by a
``kmsan_disable_current()`` call; these call pairs may be nested. One needs to
be careful with these calls, keeping the regions short and preferring other
ways to disable instrumentation, where possible.
Support
=======
@ -338,11 +345,11 @@ Per-task KMSAN state
~~~~~~~~~~~~~~~~~~~~
Every task_struct has an associated KMSAN task state that holds the KMSAN
context (see above) and a per-task flag disallowing KMSAN reports::
context (see above) and a per-task counter disallowing KMSAN reports::
struct kmsan_context {
...
bool allow_reporting;
unsigned int depth;
struct kmsan_context_state cstate;
...
}

9
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@ -443,6 +443,15 @@ is not associated with a file:
or if empty, the mapping is anonymous.
Starting with 6.11 kernel, /proc/PID/maps provides an alternative
ioctl()-based API that gives ability to flexibly and efficiently query and
filter individual VMAs. This interface is binary and is meant for more
efficient and easy programmatic use. `struct procmap_query`, defined in
linux/fs.h UAPI header, serves as an input/output argument to the
`PROCMAP_QUERY` ioctl() command. See comments in linus/fs.h UAPI header for
details on query semantics, supported flags, data returned, and general API
usage information.
The /proc/PID/smaps is an extension based on maps, showing the memory
consumption for each of the process's mappings. For each mapping (aka Virtual
Memory Area, or VMA) there is a series of lines such as the following::

4
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View File

@ -90,8 +90,6 @@ PMD Page Table Helpers
+---------------------------+--------------------------------------------------+
| pmd_leaf | Tests a leaf mapped PMD |
+---------------------------+--------------------------------------------------+
| pmd_huge | Tests a HugeTLB mapped PMD |
+---------------------------+--------------------------------------------------+
| pmd_trans_huge | Tests a Transparent Huge Page (THP) at PMD |
+---------------------------+--------------------------------------------------+
| pmd_present | Tests whether pmd_page() points to valid memory |
@ -169,8 +167,6 @@ PUD Page Table Helpers
+---------------------------+--------------------------------------------------+
| pud_leaf | Tests a leaf mapped PUD |
+---------------------------+--------------------------------------------------+
| pud_huge | Tests a HugeTLB mapped PUD |
+---------------------------+--------------------------------------------------+
| pud_trans_huge | Tests a Transparent Huge Page (THP) at PUD |
+---------------------------+--------------------------------------------------+
| pud_present | Tests a valid mapped PUD |

149
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@ -16,53 +16,24 @@ called DAMON ``context``. DAMON executes each context with a kernel thread
called ``kdamond``. Multiple kdamonds could run in parallel, for different
types of monitoring.
To know how user-space can do the configurations and start/stop DAMON, refer to
:ref:`DAMON sysfs interface <sysfs_interface>` documentation.
Overall Architecture
====================
DAMON subsystem is configured with three layers including
- Operations Set: Implements fundamental operations for DAMON that depends on
the given monitoring target address-space and available set of
software/hardware primitives,
- Core: Implements core logics including monitoring overhead/accurach control
and access-aware system operations on top of the operations set layer, and
- Modules: Implements kernel modules for various purposes that provides
interfaces for the user space, on top of the core layer.
.. _damon_design_configurable_operations_set:
Configurable Operations Set
---------------------------
For data access monitoring and additional low level work, DAMON needs a set of
implementations for specific operations that are dependent on and optimized for
the given target address space. On the other hand, the accuracy and overhead
tradeoff mechanism, which is the core logic of DAMON, is in the pure logic
space. DAMON separates the two parts in different layers, namely DAMON
Operations Set and DAMON Core Logics Layers, respectively. It further defines
the interface between the layers to allow various operations sets to be
configured with the core logic.
Due to this design, users can extend DAMON for any address space by configuring
the core logic to use the appropriate operations set. If any appropriate set
is unavailable, users can implement one on their own.
For example, physical memory, virtual memory, swap space, those for specific
processes, NUMA nodes, files, and backing memory devices would be supportable.
Also, if some architectures or devices supporting special optimized access
check primitives, those will be easily configurable.
Programmable Modules
--------------------
Core layer of DAMON is implemented as a framework, and exposes its application
programming interface to all kernel space components such as subsystems and
modules. For common use cases of DAMON, DAMON subsystem provides kernel
modules that built on top of the core layer using the API, which can be easily
used by the user space end users.
- :ref:`Operations Set <damon_operations_set>`: Implements fundamental
operations for DAMON that depends on the given monitoring target
address-space and available set of software/hardware primitives,
- :ref:`Core <damon_core_logic>`: Implements core logics including monitoring
overhead/accuracy control and access-aware system operations on top of the
operations set layer, and
- :ref:`Modules <damon_modules>`: Implements kernel modules for various
purposes that provides interfaces for the user space, on top of the core
layer.
.. _damon_operations_set:
@ -70,11 +41,32 @@ used by the user space end users.
Operations Set Layer
====================
The monitoring operations are defined in two parts:
.. _damon_design_configurable_operations_set:
For data access monitoring and additional low level work, DAMON needs a set of
implementations for specific operations that are dependent on and optimized for
the given target address space. For example, below two operations for access
monitoring are address-space dependent.
1. Identification of the monitoring target address range for the address space.
2. Access check of specific address range in the target space.
DAMON consolidates these implementations in a layer called DAMON Operations
Set, and defines the interface between it and the upper layer. The upper layer
is dedicated for DAMON's core logics including the mechanism for control of the
monitoring accruracy and the overhead.
Hence, DAMON can easily be extended for any address space and/or available
hardware features by configuring the core logic to use the appropriate
operations set. If there is no available operations set for a given purpose, a
new operations set can be implemented following the interface between the
layers.
For example, physical memory, virtual memory, swap space, those for specific
processes, NUMA nodes, files, and backing memory devices would be supportable.
Also, if some architectures or devices support special optimized access check
features, those will be easily configurable.
DAMON currently provides below three operation sets. Below two subsections
describe how those work.
@ -82,6 +74,10 @@ describe how those work.
- fvaddr: Monitor fixed virtual address ranges
- paddr: Monitor the physical address space of the system
To know how user-space can do the configuration via :ref:`DAMON sysfs interface
<sysfs_interface>`, refer to :ref:`operations <sysfs_context>` file part of the
documentation.
.. _damon_design_vaddr_target_regions_construction:
@ -140,9 +136,12 @@ conflict with the reclaim logic using ``PG_idle`` and ``PG_young`` page flags,
as Idle page tracking does.
.. _damon_core_logic:
Core Logics
===========
.. _damon_design_monitoring:
Monitoring
----------
@ -152,6 +151,10 @@ monitoring attributes, ``sampling interval``, ``aggregation interval``,
``update interval``, ``minimum number of regions``, and ``maximum number of
regions``.
To know how user-space can set the attributes via :ref:`DAMON sysfs interface
<sysfs_interface>`, refer to :ref:`monitoring_attrs <sysfs_monitoring_attrs>`
part of the documentation.
Access Frequency Monitoring
~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -192,7 +195,7 @@ one page in the region is required to be checked. Thus, for each ``sampling
interval``, DAMON randomly picks one page in each region, waits for one
``sampling interval``, checks whether the page is accessed meanwhile, and
increases the access frequency counter of the region if so. The counter is
called ``nr_regions`` of the region. Therefore, the monitoring overhead is
called ``nr_accesses`` of the region. Therefore, the monitoring overhead is
controllable by setting the number of regions. DAMON allows users to set the
minimum and the maximum number of regions for the trade-off.
@ -209,11 +212,18 @@ the data access pattern can be dynamically changed. This will result in low
monitoring quality. To keep the assumption as much as possible, DAMON
adaptively merges and splits each region based on their access frequency.
For each ``aggregation interval``, it compares the access frequencies of
adjacent regions and merges those if the frequency difference is small. Then,
after it reports and clears the aggregated access frequency of each region, it
splits each region into two or three regions if the total number of regions
will not exceed the user-specified maximum number of regions after the split.
For each ``aggregation interval``, it compares the access frequencies
(``nr_accesses``) of adjacent regions. If the difference is small, and if the
sum of the two regions' sizes is smaller than the size of total regions divided
by the ``minimum number of regions``, DAMON merges the two regions. If the
resulting number of total regions is still higher than ``maximum number of
regions``, it repeats the merging with increasing access frequenceis difference
threshold until the upper-limit of the number of regions is met, or the
threshold becomes higher than possible maximum value (``aggregation interval``
divided by ``sampling interval``). Then, after it reports and clears the
aggregated access frequency of each region, it splits each region into two or
three regions if the total number of regions will not exceed the user-specified
maximum number of regions after the split.
In this way, DAMON provides its best-effort quality and minimal overhead while
keeping the bounds users set for their trade-off.
@ -248,6 +258,11 @@ and applies it to monitoring operations-related data structures such as the
abstracted monitoring target memory area only for each of a user-specified time
interval (``update interval``).
User-space can get the monitoring results via DAMON sysfs interface and/or
tracepoints. For more details, please refer to the documentations for
:ref:`DAMOS tried regions <sysfs_schemes_tried_regions>` and :ref:`tracepoint`,
respectively.
.. _damon_design_damos:
@ -288,6 +303,10 @@ the access pattern of interest, and applies the user-desired operation actions
to the regions, for every user-specified time interval called
``apply_interval``.
To know how user-space can set ``apply_interval`` via :ref:`DAMON sysfs
interface <sysfs_interface>`, refer to :ref:`apply_interval_us <sysfs_scheme>`
part of the documentation.
.. _damon_design_damos_action:
@ -325,6 +344,10 @@ that supports each action are as below.
Supported by ``paddr`` operations set.
- ``lru_deprio``: Deprioritize the region on its LRU lists.
Supported by ``paddr`` operations set.
- ``migrate_hot``: Migrate the regions prioritizing warmer regions.
Supported by ``paddr`` operations set.
- ``migrate_cold``: Migrate the regions prioritizing colder regions.
Supported by ``paddr`` operations set.
- ``stat``: Do nothing but count the statistics.
Supported by all operations sets.
@ -332,6 +355,10 @@ Applying the actions except ``stat`` to a region is considered as changing the
region's characteristics. Hence, DAMOS resets the age of regions when any such
actions are applied to those.
To know how user-space can set the action via :ref:`DAMON sysfs interface
<sysfs_interface>`, refer to :ref:`action <sysfs_scheme>` part of the
documentation.
.. _damon_design_damos_access_pattern:
@ -345,6 +372,10 @@ interest by setting minimum and maximum values of the three properties. If a
region's three properties are in the ranges, DAMOS classifies it as one of the
regions that the scheme is having an interest in.
To know how user-space can set the access pattern via :ref:`DAMON sysfs
interface <sysfs_interface>`, refer to :ref:`access_pattern
<sysfs_access_pattern>` part of the documentation.
.. _damon_design_damos_quotas:
@ -364,6 +395,10 @@ feature called quotas. It lets users specify an upper limit of time that DAMOS
can use for applying the action, and/or a maximum bytes of memory regions that
the action can be applied within a user-specified time duration.
To know how user-space can set the basic quotas via :ref:`DAMON sysfs interface
<sysfs_interface>`, refer to :ref:`quotas <sysfs_quotas>` part of the
documentation.
.. _damon_design_damos_quotas_prioritization:
@ -391,6 +426,10 @@ information to the underlying mechanism. Nevertheless, how and even whether
the weight will be respected are up to the underlying prioritization mechanism
implementation.
To know how user-space can set the prioritization weights via :ref:`DAMON sysfs
interface <sysfs_interface>`, refer to :ref:`weights <sysfs_quotas>` part of
the documentation.
.. _damon_design_damos_quotas_auto_tuning:
@ -420,6 +459,10 @@ Currently, two ``target_metric`` are provided.
DAMOS does the measurement on its own, so only ``target_value`` need to be
set by users at the initial time. In other words, DAMOS does self-feedback.
To know how user-space can set the tuning goal metric, the target value, and/or
the current value via :ref:`DAMON sysfs interface <sysfs_interface>`, refer to
:ref:`quota goals <sysfs_schemes_quota_goals>` part of the documentation.
.. _damon_design_damos_watermarks:
@ -442,6 +485,10 @@ is activated. If all schemes are deactivated by the watermarks, the monitoring
is also deactivated. In this case, the DAMON worker thread only periodically
checks the watermarks and therefore incurs nearly zero overhead.
To know how user-space can set the watermarks via :ref:`DAMON sysfs interface
<sysfs_interface>`, refer to :ref:`watermarks <sysfs_watermarks>` part of the
documentation.
.. _damon_design_damos_filters:
@ -488,6 +535,10 @@ Below types of filters are currently supported.
- Applied to pages that belonging to a given DAMON monitoring target.
- Handled by the core logic.
To know how user-space can set the watermarks via :ref:`DAMON sysfs interface
<sysfs_interface>`, refer to :ref:`filters <sysfs_filters>` part of the
documentation.
Application Programming Interface
---------------------------------
@ -501,6 +552,8 @@ interface, namely ``include/linux/damon.h``. Please refer to the API
:doc:`document </mm/damon/api>` for details of the interface.
.. _damon_modules:
Modules
=======

22
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@ -6,7 +6,7 @@ DAMON: Data Access MONitor
DAMON is a Linux kernel subsystem that provides a framework for data access
monitoring and the monitoring results based system operations. The core
monitoring mechanisms of DAMON (refer to :doc:`design` for the detail) make it
monitoring :ref:`mechanisms <damon_design_monitoring>` of DAMON make it
- *accurate* (the monitoring output is useful enough for DRAM level memory
management; It might not appropriate for CPU Cache levels, though),
@ -16,15 +16,16 @@ monitoring mechanisms of DAMON (refer to :doc:`design` for the detail) make it
of the size of target workloads).
Using this framework, therefore, the kernel can operate system in an
access-aware fashion. Because the features are also exposed to the user space,
users who have special information about their workloads can write personalized
applications for better understanding and optimizations of their workloads and
systems.
access-aware fashion. Because the features are also exposed to the :doc:`user
space </admin-guide/mm/damon/index>`, users who have special information about
their workloads can write personalized applications for better understanding
and optimizations of their workloads and systems.
For easier development of such systems, DAMON provides a feature called DAMOS
(DAMon-based Operation Schemes) in addition to the monitoring. Using the
feature, DAMON users in both kernel and user spaces can do access-aware system
operations with no code but simple configurations.
For easier development of such systems, DAMON provides a feature called
:ref:`DAMOS <damon_design_damos>` (DAMon-based Operation Schemes) in addition
to the monitoring. Using the feature, DAMON users in both kernel and :doc:`user
spaces </admin-guide/mm/damon/index>` can do access-aware system operations
with no code but simple configurations.
.. toctree::
:maxdepth: 2
@ -33,3 +34,6 @@ operations with no code but simple configurations.
design
api
maintainer-profile
To utilize and control DAMON from the user-space, please refer to the
administration :doc:`guide </admin-guide/mm/damon/index>`.

36
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@ -53,6 +53,40 @@ Mon-Fri) in PT (Pacific Time). The response to patches will occasionally be
slow. Do not hesitate to send a ping if you have not heard back within a week
of sending a patch.
Mailing tool
------------
Like many other Linux kernel subsystems, DAMON uses the mailing lists
(damon@lists.linux.dev and linux-mm@kvack.org) as the major communication
channel. There is a simple tool called HacKerMaiL (``hkml``) [8]_ , which is
for people who are not very familiar with the mailing lists based
communication. The tool could be particularly helpful for DAMON community
members since it is developed and maintained by DAMON maintainer. The tool is
also officially announced to support DAMON and general Linux kernel development
workflow.
In other words, ``hkml`` [8]_ is a mailing tool for DAMON community, which
DAMON maintainer is committed to support. Please feel free to try and report
issues or feature requests for the tool to the maintainer.
Community meetup
----------------
DAMON community is maintaining two bi-weekly meetup series for community
members who prefer synchronous conversations over mails.
The first one is for any discussion between every community member. No
reservation is needed.
The seconds one is for discussions on specific topics between restricted
members including the maintainer. The maintainer shares the available time
slots, and attendees should reserve one of those at least 24 hours before the
time slot, by reaching out to the maintainer.
Schedules and available reservation time slots are available at the Google doc
[9]_ . DAMON maintainer will also provide periodic reminder to the mailing
list (damon@lists.linux.dev).
.. [1] https://git.kernel.org/akpm/mm/h/mm-unstable
.. [2] https://git.kernel.org/sj/h/damon/next
@ -61,3 +95,5 @@ of sending a patch.
.. [5] https://github.com/awslabs/damon-tests/blob/master/corr/tests/kunit.sh
.. [6] https://github.com/awslabs/damon-tests/tree/master/corr
.. [7] https://github.com/awslabs/damon-tests/tree/master/perf
.. [8] https://github.com/damonitor/hackermail
.. [9] https://docs.google.com/document/d/1v43Kcj3ly4CYqmAkMaZzLiM2GEnWfgdGbZAH3mi2vpM/edit?usp=sharing

10
Documentation/mm/unevictable-lru.rst
View File

@ -191,13 +191,13 @@ have become evictable again (via munlock() for example) and have been "rescued"
from the unevictable list. However, there may be situations where we decide,
for the sake of expediency, to leave an unevictable folio on one of the regular
active/inactive LRU lists for vmscan to deal with. vmscan checks for such
folios in all of the shrink_{active|inactive|page}_list() functions and will
folios in all of the shrink_{active|inactive|folio}_list() functions and will
"cull" such folios that it encounters: that is, it diverts those folios to the
unevictable list for the memory cgroup and node being scanned.
There may be situations where a folio is mapped into a VM_LOCKED VMA,
but the folio does not have the mlocked flag set. Such folios will make
it all the way to shrink_active_list() or shrink_page_list() where they
it all the way to shrink_active_list() or shrink_folio_list() where they
will be detected when vmscan walks the reverse map in folio_referenced()
or try_to_unmap(). The folio is culled to the unevictable list when it
is released by the shrinker.
@ -269,7 +269,7 @@ the LRU. Such pages can be "noticed" by memory management in several places:
(4) in the fault path and when a VM_LOCKED stack segment is expanded; or
(5) as mentioned above, in vmscan:shrink_page_list() when attempting to
(5) as mentioned above, in vmscan:shrink_folio_list() when attempting to
reclaim a page in a VM_LOCKED VMA by folio_referenced() or try_to_unmap().
mlocked pages become unlocked and rescued from the unevictable list when:
@ -548,12 +548,12 @@ Some examples of these unevictable pages on the LRU lists are:
(3) pages still mapped into VM_LOCKED VMAs, which should be marked mlocked,
but events left mlock_count too low, so they were munlocked too early.
vmscan's shrink_inactive_list() and shrink_page_list() also divert obviously
vmscan's shrink_inactive_list() and shrink_folio_list() also divert obviously
unevictable pages found on the inactive lists to the appropriate memory cgroup
and node unevictable list.
rmap's folio_referenced_one(), called via vmscan's shrink_active_list() or
shrink_page_list(), and rmap's try_to_unmap_one() called via shrink_page_list(),
shrink_folio_list(), and rmap's try_to_unmap_one() called via shrink_folio_list(),
check for (3) pages still mapped into VM_LOCKED VMAs, and call mlock_vma_folio()
to correct them. Such pages are culled to the unevictable list when released
by the shrinker.

2
MAINTAINERS
View File

@ -5701,6 +5701,8 @@ L: linux-mm@kvack.org
S: Maintained
F: include/linux/memcontrol.h
F: mm/memcontrol.c
F: mm/memcontrol-v1.c
F: mm/memcontrol-v1.h
F: mm/swap_cgroup.c
F: samples/cgroup/*
F: tools/testing/selftests/cgroup/memcg_protection.m

2
arch/arm/include/asm/cacheflush.h
View File

@ -283,7 +283,7 @@ void flush_cache_pages(struct vm_area_struct *vma, unsigned long user_addr,
* flush_dcache_page is used when the kernel has written to the page
* cache page at virtual address page->virtual.
*
* If this page isn't mapped (ie, page_mapping == NULL), or it might
* If this page isn't mapped (ie, folio_mapping == NULL), or it might
* have userspace mappings, then we _must_ always clean + invalidate
* the dcache entries associated with the kernel mapping.
*

4
arch/arm/include/asm/hugetlb-3level.h
View File

@ -13,12 +13,12 @@
/*
* If our huge pte is non-zero then mark the valid bit.
* This allows pte_present(huge_ptep_get(ptep)) to return true for non-zero
* This allows pte_present(huge_ptep_get(mm,addr,ptep)) to return true for non-zero
* ptes.
* (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes).
*/
#define __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(pte_t *ptep)
static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_t retval = *ptep;
if (pte_val(retval))

2
arch/arm64/include/asm/cacheflush.h
View File

@ -117,7 +117,7 @@ extern void copy_to_user_page(struct vm_area_struct *, struct page *,
* flush_dcache_folio is used when the kernel has written to the page
* cache page at virtual address page->virtual.
*
* If this page isn't mapped (ie, page_mapping == NULL), or it might
* If this page isn't mapped (ie, folio_mapping == NULL), or it might
* have userspace mappings, then we _must_ always clean + invalidate
* the dcache entries associated with the kernel mapping.
*

2
arch/arm64/include/asm/hugetlb.h
View File

@ -46,7 +46,7 @@ extern pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz);
#define __HAVE_ARCH_HUGE_PTEP_GET
extern pte_t huge_ptep_get(pte_t *ptep);
extern pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
void __init arm64_hugetlb_cma_reserve(void);

2
arch/arm64/mm/hugetlbpage.c
View File

@ -127,7 +127,7 @@ static inline int num_contig_ptes(unsigned long size, size_t *pgsize)
return contig_ptes;
}
pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
int ncontig, i;
size_t pgsize;

4
arch/loongarch/include/asm/pgtable.h
View File

@ -467,8 +467,8 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
#define update_mmu_cache(vma, addr, ptep) \
update_mmu_cache_range(NULL, vma, addr, ptep, 1)
#define __HAVE_ARCH_UPDATE_MMU_TLB
#define update_mmu_tlb update_mmu_cache
#define update_mmu_tlb_range(vma, addr, ptep, nr) \
update_mmu_cache_range(NULL, vma, addr, ptep, nr)
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)

4
arch/mips/include/asm/pgtable.h
View File

@ -594,8 +594,8 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
#define update_mmu_cache(vma, address, ptep) \
update_mmu_cache_range(NULL, vma, address, ptep, 1)
#define __HAVE_ARCH_UPDATE_MMU_TLB
#define update_mmu_tlb update_mmu_cache
#define update_mmu_tlb_range(vma, address, ptep, nr) \
update_mmu_cache_range(NULL, vma, address, ptep, nr)
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)

2
arch/mips/mm/cache.c
View File

@ -112,7 +112,7 @@ void __flush_dcache_pages(struct page *page, unsigned int nr)
}
/*
* We could delay the flush for the !page_mapping case too. But that
* We could delay the flush for the !folio_mapping case too. But that
* case is for exec env/arg pages and those are %99 certainly going to
* get faulted into the tlb (and thus flushed) anyways.
*/

1
arch/powerpc/Kconfig
View File

@ -135,7 +135,6 @@ config PPC
select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_HUGEPD if HUGETLB_PAGE
select ARCH_HAS_KCOV
select ARCH_HAS_KERNEL_FPU_SUPPORT if PPC64 && PPC_FPU
select ARCH_HAS_MEMBARRIER_CALLBACKS

2
arch/powerpc/include/asm/book3s/32/pgalloc.h
View File

@ -47,8 +47,6 @@ static inline void pgtable_free(void *table, unsigned index_size)
}
}
#define get_hugepd_cache_index(x) (x)
static inline void pgtable_free_tlb(struct mmu_gather *tlb,
void *table, int shift)
{

15
arch/powerpc/include/asm/book3s/64/hash-4k.h
View File

@ -74,21 +74,6 @@
#define remap_4k_pfn(vma, addr, pfn, prot) \
remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
#ifdef CONFIG_HUGETLB_PAGE
static inline int hash__hugepd_ok(hugepd_t hpd)
{
unsigned long hpdval = hpd_val(hpd);
/*
* if it is not a pte and have hugepd shift mask
* set, then it is a hugepd directory pointer
*/
if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) &&
((hpdval & HUGEPD_SHIFT_MASK) != 0))
return true;
return false;
}
#endif
/*
* 4K PTE format is different from 64K PTE format. Saving the hash_slot is just
* a matter of returning the PTE bits that need to be modified. On 64K PTE,

40
arch/powerpc/include/asm/book3s/64/hash.h
View File

@ -4,6 +4,7 @@
#ifdef __KERNEL__
#include <asm/asm-const.h>
#include <asm/book3s/64/slice.h>
/*
* Common bits between 4K and 64K pages in a linux-style PTE.
@ -161,14 +162,10 @@ extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long pte, int huge);
unsigned long htab_convert_pte_flags(unsigned long pteflags, unsigned long flags);
/* Atomic PTE updates */
static inline unsigned long hash__pte_update(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep, unsigned long clr,
unsigned long set,
int huge)
static inline unsigned long hash__pte_update_one(pte_t *ptep, unsigned long clr,
unsigned long set)
{
__be64 old_be, tmp_be;
unsigned long old;
__asm__ __volatile__(
"1: ldarx %0,0,%3 # pte_update\n\
@ -182,11 +179,40 @@ static inline unsigned long hash__pte_update(struct mm_struct *mm,
: "r" (ptep), "r" (cpu_to_be64(clr)), "m" (*ptep),
"r" (cpu_to_be64(H_PAGE_BUSY)), "r" (cpu_to_be64(set))
: "cc" );
return be64_to_cpu(old_be);
}
static inline unsigned long hash__pte_update(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep, unsigned long clr,
unsigned long set,
int huge)
{
unsigned long old;
old = hash__pte_update_one(ptep, clr, set);
if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && huge) {
unsigned int psize = get_slice_psize(mm, addr);
int nb, i;
if (psize == MMU_PAGE_16M)
nb = SZ_16M / PMD_SIZE;
else if (psize == MMU_PAGE_16G)
nb = SZ_16G / PUD_SIZE;
else
nb = 1;
WARN_ON_ONCE(nb == 1); /* Should never happen */
for (i = 1; i < nb; i++)
hash__pte_update_one(ptep + i, clr, set);
}
/* huge pages use the old page table lock */
if (!huge)
assert_pte_locked(mm, addr);
old = be64_to_cpu(old_be);
if (old & H_PAGE_HASHPTE)
hpte_need_flush(mm, addr, ptep, old, huge);

38
arch/powerpc/include/asm/book3s/64/hugetlb.h
View File

@ -49,9 +49,6 @@ static inline bool gigantic_page_runtime_supported(void)
return true;
}
/* hugepd entry valid bit */
#define HUGEPD_VAL_BITS (0x8000000000000000UL)
#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep);
@ -60,29 +57,7 @@ extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t old_pte, pte_t new_pte);
/*
* This should work for other subarchs too. But right now we use the
* new format only for 64bit book3s
*/
static inline pte_t *hugepd_page(hugepd_t hpd)
{
BUG_ON(!hugepd_ok(hpd));
/*
* We have only four bits to encode, MMU page size
*/
BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
}
static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
{
return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
}
static inline unsigned int hugepd_shift(hugepd_t hpd)
{
return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
}
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
@ -90,19 +65,6 @@ static inline void flush_hugetlb_page(struct vm_area_struct *vma,
return radix__flush_hugetlb_page(vma, vmaddr);
}
static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
unsigned int pdshift)
{
unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
return hugepd_page(hpd) + idx;
}
static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
{
*hpdp = __hugepd(__pa(new) | HUGEPD_VAL_BITS | (shift_to_mmu_psize(pshift) << 2));
}
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
static inline int check_and_get_huge_psize(int shift)

47
arch/powerpc/include/asm/book3s/64/pgtable-4k.h
View File

@ -1,47 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_4K_H
#define _ASM_POWERPC_BOOK3S_64_PGTABLE_4K_H
/*
* hash 4k can't share hugetlb and also doesn't support THP
*/
#ifndef __ASSEMBLY__
#ifdef CONFIG_HUGETLB_PAGE
/*
* With radix , we have hugepage ptes in the pud and pmd entries. We don't
* need to setup hugepage directory for them. Our pte and page directory format
* enable us to have this enabled.
*/
static inline int hugepd_ok(hugepd_t hpd)
{
if (radix_enabled())
return 0;
return hash__hugepd_ok(hpd);
}
#define is_hugepd(hpd) (hugepd_ok(hpd))
/*
* 16M and 16G huge page directory tables are allocated from slab cache
*
*/
#define H_16M_CACHE_INDEX (PAGE_SHIFT + H_PTE_INDEX_SIZE + H_PMD_INDEX_SIZE - 24)
#define H_16G_CACHE_INDEX \
(PAGE_SHIFT + H_PTE_INDEX_SIZE + H_PMD_INDEX_SIZE + H_PUD_INDEX_SIZE - 34)
static inline int get_hugepd_cache_index(int index)
{
switch (index) {
case H_16M_CACHE_INDEX:
return HTLB_16M_INDEX;
case H_16G_CACHE_INDEX:
return HTLB_16G_INDEX;
default:
BUG();
}
/* should not reach */
}
#endif /* CONFIG_HUGETLB_PAGE */
#endif /* __ASSEMBLY__ */
#endif /*_ASM_POWERPC_BOOK3S_64_PGTABLE_4K_H */

20
arch/powerpc/include/asm/book3s/64/pgtable-64k.h
View File

@ -5,26 +5,6 @@
#ifndef __ASSEMBLY__
#ifdef CONFIG_HUGETLB_PAGE
/*
* With 64k page size, we have hugepage ptes in the pgd and pmd entries. We don't
* need to setup hugepage directory for them. Our pte and page directory format
* enable us to have this enabled.
*/
static inline int hugepd_ok(hugepd_t hpd)
{
return 0;
}
#define is_hugepd(pdep) 0
/*
* This should never get called
*/
static __always_inline int get_hugepd_cache_index(int index)
{
BUILD_BUG();
}
#endif /* CONFIG_HUGETLB_PAGE */
static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,

22
arch/powerpc/include/asm/book3s/64/pgtable.h
View File

@ -274,6 +274,24 @@ static inline bool pud_leaf(pud_t pud)
{
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
}
#define pmd_leaf_size pmd_leaf_size
static inline unsigned long pmd_leaf_size(pmd_t pmd)
{
if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !radix_enabled())
return SZ_16M;
else
return PMD_SIZE;
}
#define pud_leaf_size pud_leaf_size
static inline unsigned long pud_leaf_size(pud_t pud)
{
if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !radix_enabled())
return SZ_16G;
else
return PUD_SIZE;
}
#endif /* __ASSEMBLY__ */
#include <asm/book3s/64/hash.h>
@ -285,11 +303,9 @@ static inline bool pud_leaf(pud_t pud)
#define MAX_PHYSMEM_BITS R_MAX_PHYSMEM_BITS
#endif
/* hash 4k can't share hugetlb and also doesn't support THP */
#ifdef CONFIG_PPC_64K_PAGES
#include <asm/book3s/64/pgtable-64k.h>
#else
#include <asm/book3s/64/pgtable-4k.h>
#endif
#include <asm/barrier.h>

15
arch/powerpc/include/asm/hugetlb.h
View File

@ -30,10 +30,9 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
}
#define is_hugepage_only_range is_hugepage_only_range
#define __HAVE_ARCH_HUGETLB_FREE_PGD_RANGE
void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
unsigned long end, unsigned long floor,
unsigned long ceiling);
#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
pte_t pte, unsigned long sz);
#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
@ -67,14 +66,6 @@ static inline void flush_hugetlb_page(struct vm_area_struct *vma,
{
}
#define hugepd_shift(x) 0
static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
unsigned pdshift)
{
return NULL;
}
static inline void __init gigantic_hugetlb_cma_reserve(void)
{
}

38
arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h
View File

@ -4,42 +4,12 @@
#define PAGE_SHIFT_8M 23
static inline pte_t *hugepd_page(hugepd_t hpd)
{
BUG_ON(!hugepd_ok(hpd));
return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
}
static inline unsigned int hugepd_shift(hugepd_t hpd)
{
return PAGE_SHIFT_8M;
}
static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
unsigned int pdshift)
{
unsigned long idx = (addr & (SZ_4M - 1)) >> PAGE_SHIFT;
return hugepd_page(hpd) + idx;
}
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
flush_tlb_page(vma, vmaddr);
}
static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
{
*hpdp = __hugepd(__pa(new) | _PMD_USER | _PMD_PRESENT | _PMD_PAGE_8M);
}
static inline void hugepd_populate_kernel(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
{
*hpdp = __hugepd(__pa(new) | _PMD_PRESENT | _PMD_PAGE_8M);
}
static inline int check_and_get_huge_psize(int shift)
{
return shift_to_mmu_psize(shift);
@ -49,6 +19,14 @@ static inline int check_and_get_huge_psize(int shift)
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
pte_t pte, unsigned long sz);
#define __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
if (ptep_is_8m_pmdp(mm, addr, ptep))
ptep = pte_offset_kernel((pmd_t *)ptep, ALIGN_DOWN(addr, SZ_8M));
return ptep_get(ptep);
}
#define __HAVE_ARCH_HUGE_PTE_CLEAR
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz)

9
arch/powerpc/include/asm/nohash/32/mmu-8xx.h
View File

@ -189,19 +189,14 @@ typedef struct {
#define PHYS_IMMR_BASE (mfspr(SPRN_IMMR) & 0xfff80000)
/* Page size definitions, common between 32 and 64-bit
/*
* Page size definitions for 8xx
*
* shift : is the "PAGE_SHIFT" value for that page size
* penc : is the pte encoding mask
*
*/
struct mmu_psize_def {
unsigned int shift; /* number of bits */
unsigned int enc; /* PTE encoding */
unsigned int ind; /* Corresponding indirect page size shift */
unsigned int flags;
#define MMU_PAGE_SIZE_DIRECT 0x1 /* Supported as a direct size */
#define MMU_PAGE_SIZE_INDIRECT 0x2 /* Supported as an indirect size */
};
extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];

3
arch/powerpc/include/asm/nohash/32/pte-44x.h
View File

@ -75,9 +75,6 @@
#define _PAGE_NO_CACHE 0x00000400 /* H: I bit */
#define _PAGE_WRITETHRU 0x00000800 /* H: W bit */
/* No page size encoding in the linux PTE */
#define _PAGE_PSIZE 0
/* TODO: Add large page lowmem mapping support */
#define _PMD_PRESENT 0
#define _PMD_PRESENT_MASK (PAGE_MASK)

3
arch/powerpc/include/asm/nohash/32/pte-85xx.h
View File

@ -31,9 +31,6 @@
#define _PAGE_WRITETHRU 0x00400 /* H: W bit */
#define _PAGE_SPECIAL 0x00800 /* S: Special page */
/* No page size encoding in the linux PTE */
#define _PAGE_PSIZE 0
#define _PMD_PRESENT 0
#define _PMD_PRESENT_MASK (PAGE_MASK)
#define _PMD_BAD (~PAGE_MASK)

56
arch/powerpc/include/asm/nohash/32/pte-8xx.h
View File

@ -74,12 +74,11 @@
#define _PTE_NONE_MASK 0
#ifdef CONFIG_PPC_16K_PAGES
#define _PAGE_PSIZE _PAGE_SPS
#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_SPS)
#else
#define _PAGE_PSIZE 0
#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED)
#endif
#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
#define _PAGE_BASE (_PAGE_BASE_NC)
#include <asm/pgtable-masks.h>
@ -120,7 +119,7 @@ static inline pte_t pte_mkhuge(pte_t pte)
#define pte_mkhuge pte_mkhuge
static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
unsigned long clr, unsigned long set, int huge);
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@ -142,19 +141,12 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma, pte_t *pt
}
#define __ptep_set_access_flags __ptep_set_access_flags
static inline unsigned long pgd_leaf_size(pgd_t pgd)
{
if (pgd_val(pgd) & _PMD_PAGE_8M)
return SZ_8M;
return SZ_4M;
}
#define pgd_leaf_size pgd_leaf_size
static inline unsigned long pte_leaf_size(pte_t pte)
static inline unsigned long __pte_leaf_size(pmd_t pmd, pte_t pte)
{
pte_basic_t val = pte_val(pte);
if (pmd_val(pmd) & _PMD_PAGE_8M)
return SZ_8M;
if (val & _PAGE_HUGE)
return SZ_512K;
if (val & _PAGE_SPS)
@ -162,30 +154,37 @@ static inline unsigned long pte_leaf_size(pte_t pte)
return SZ_4K;
}
#define pte_leaf_size pte_leaf_size
#define __pte_leaf_size __pte_leaf_size
/*
* On the 8xx, the page tables are a bit special. For 16k pages, we have
* 4 identical entries. For 512k pages, we have 128 entries as if it was
* 4k pages, but they are flagged as 512k pages for the hardware.
* For other page sizes, we have a single entry in the table.
* For 8M pages, we have 1024 entries as if it was 4M pages (PMD_SIZE)
* but they are flagged as 8M pages for the hardware.
* For 4k pages, we have a single entry in the table.
*/
static pmd_t *pmd_off(struct mm_struct *mm, unsigned long addr);
static int hugepd_ok(hugepd_t hpd);
static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address);
static inline bool ptep_is_8m_pmdp(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
return (pmd_t *)ptep == pmd_off(mm, ALIGN_DOWN(addr, SZ_8M));
}
static inline int number_of_cells_per_pte(pmd_t *pmd, pte_basic_t val, int huge)
{
if (!huge)
return PAGE_SIZE / SZ_4K;
else if (hugepd_ok(*((hugepd_t *)pmd)))
return 1;
else if ((pmd_val(*pmd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M)
return SZ_4M / SZ_4K;
else if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !(val & _PAGE_HUGE))
return SZ_16K / SZ_4K;
else
return SZ_512K / SZ_4K;
}
static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
static inline pte_basic_t __pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
unsigned long clr, unsigned long set, int huge)
{
pte_basic_t *entry = (pte_basic_t *)p;
@ -198,7 +197,7 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
for (i = 0; i < num; i += PAGE_SIZE / SZ_4K, new += PAGE_SIZE) {
*entry++ = new;
if (IS_ENABLED(CONFIG_PPC_16K_PAGES) && num != 1) {
if (IS_ENABLED(CONFIG_PPC_16K_PAGES)) {
*entry++ = new;
*entry++ = new;
*entry++ = new;
@ -208,6 +207,21 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
return old;
}
static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
unsigned long clr, unsigned long set, int huge)
{
pte_basic_t old;
if (huge && ptep_is_8m_pmdp(mm, addr, ptep)) {
pmd_t *pmdp = (pmd_t *)ptep;
old = __pte_update(mm, addr, pte_offset_kernel(pmdp, 0), clr, set, huge);
__pte_update(mm, addr, pte_offset_kernel(pmdp + 1, 0), clr, set, huge);
} else {
old = __pte_update(mm, addr, ptep, clr, set, huge);
}
return old;
}
#define pte_update pte_update
#ifdef CONFIG_PPC_16K_PAGES

39
arch/powerpc/include/asm/nohash/hugetlb-e500.h
View File

@ -2,38 +2,8 @@
#ifndef _ASM_POWERPC_NOHASH_HUGETLB_E500_H
#define _ASM_POWERPC_NOHASH_HUGETLB_E500_H
static inline pte_t *hugepd_page(hugepd_t hpd)
{
if (WARN_ON(!hugepd_ok(hpd)))
return NULL;
return (pte_t *)((hpd_val(hpd) & ~HUGEPD_SHIFT_MASK) | PD_HUGE);
}
static inline unsigned int hugepd_shift(hugepd_t hpd)
{
return hpd_val(hpd) & HUGEPD_SHIFT_MASK;
}
static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
unsigned int pdshift)
{
/*
* On FSL BookE, we have multiple higher-level table entries that
* point to the same hugepte. Just use the first one since they're all
* identical. So for that case, idx=0.
*/
return hugepd_page(hpd);
}
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
{
/* We use the old format for PPC_E500 */
*hpdp = __hugepd(((unsigned long)new & ~PD_HUGE) | pshift);
}
static inline int check_and_get_huge_psize(int shift)
{
if (shift & 1) /* Not a power of 4 */
@ -42,4 +12,13 @@ static inline int check_and_get_huge_psize(int shift)
return shift_to_mmu_psize(shift);
}
static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
{
unsigned int tsize = shift - _PAGE_PSIZE_SHIFT_OFFSET;
pte_basic_t val = (tsize << _PAGE_PSIZE_SHIFT) & _PAGE_PSIZE_MSK;
return __pte((pte_val(entry) & ~(pte_basic_t)_PAGE_PSIZE_MSK) | val);
}
#define arch_make_huge_pte arch_make_huge_pte
#endif /* _ASM_POWERPC_NOHASH_HUGETLB_E500_H */

6
arch/powerpc/include/asm/nohash/mmu-e500.h
View File

@ -244,14 +244,11 @@ typedef struct {
/* Page size definitions, common between 32 and 64-bit
*
* shift : is the "PAGE_SHIFT" value for that page size
* penc : is the pte encoding mask
*
*/
struct mmu_psize_def
{
unsigned int shift; /* number of bits */
unsigned int enc; /* PTE encoding */
unsigned int ind; /* Corresponding indirect page size shift */
unsigned int flags;
#define MMU_PAGE_SIZE_DIRECT 0x1 /* Supported as a direct size */
#define MMU_PAGE_SIZE_INDIRECT 0x2 /* Supported as an indirect size */
@ -303,8 +300,7 @@ extern unsigned long linear_map_top;
extern int book3e_htw_mode;
#define PPC_HTW_NONE 0
#define PPC_HTW_IBM 1
#define PPC_HTW_E6500 2
#define PPC_HTW_E6500 1
/*
* 64-bit booke platforms don't load the tlb in the tlb miss handler code.

2
arch/powerpc/include/asm/nohash/pgalloc.h
View File

@ -44,8 +44,6 @@ static inline void pgtable_free(void *table, int shift)
}
}
#define get_hugepd_cache_index(x) (x)
static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
{
unsigned long pgf = (unsigned long)table;

44
arch/powerpc/include/asm/nohash/pgtable.h
View File

@ -31,6 +31,13 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
extern int icache_44x_need_flush;
#ifndef pte_huge_size
static inline unsigned long pte_huge_size(pte_t pte)
{
return PAGE_SIZE;
}
#endif
/*
* PTE updates. This function is called whenever an existing
* valid PTE is updated. This does -not- include set_pte_at()
@ -52,11 +59,34 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
{
pte_basic_t old = pte_val(*p);
pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
unsigned long sz;
unsigned long pdsize;
int i;
if (new == old)
return old;
if (huge)
sz = pte_huge_size(__pte(old));
else
sz = PAGE_SIZE;
if (sz < PMD_SIZE)
pdsize = PAGE_SIZE;
else if (sz < PUD_SIZE)
pdsize = PMD_SIZE;
else if (sz < P4D_SIZE)
pdsize = PUD_SIZE;
else if (sz < PGDIR_SIZE)
pdsize = P4D_SIZE;
else
pdsize = PGDIR_SIZE;
for (i = 0; i < sz / pdsize; i++, p++) {
*p = __pte(new);
if (new)
new += (unsigned long long)(pdsize / PAGE_SIZE) << PTE_RPN_SHIFT;
}
if (IS_ENABLED(CONFIG_44x) && !is_kernel_addr(addr) && (old & _PAGE_EXEC))
icache_44x_need_flush = 1;
@ -340,20 +370,6 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
#define pgprot_writecombine pgprot_noncached_wc
#ifdef CONFIG_HUGETLB_PAGE
static inline int hugepd_ok(hugepd_t hpd)
{
#ifdef CONFIG_PPC_8xx
return ((hpd_val(hpd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M);
#else
/* We clear the top bit to indicate hugepd */
return (hpd_val(hpd) && (hpd_val(hpd) & PD_HUGE) == 0);
#endif
}
#define is_hugepd(hpd) (hugepd_ok(hpd))
#endif
int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
void unmap_kernel_page(unsigned long va);

63
arch/powerpc/include/asm/nohash/pte-e500.h
View File

@ -19,20 +19,7 @@
#define _PAGE_BAP_SX 0x000040
#define _PAGE_BAP_UX 0x000080
#define _PAGE_PSIZE_MSK 0x000f00
#define _PAGE_PSIZE_4K 0x000200
#define _PAGE_PSIZE_8K 0x000300
#define _PAGE_PSIZE_16K 0x000400
#define _PAGE_PSIZE_32K 0x000500
#define _PAGE_PSIZE_64K 0x000600
#define _PAGE_PSIZE_128K 0x000700
#define _PAGE_PSIZE_256K 0x000800
#define _PAGE_PSIZE_512K 0x000900
#define _PAGE_PSIZE_1M 0x000a00
#define _PAGE_PSIZE_2M 0x000b00
#define _PAGE_PSIZE_4M 0x000c00
#define _PAGE_PSIZE_8M 0x000d00
#define _PAGE_PSIZE_16M 0x000e00
#define _PAGE_PSIZE_32M 0x000f00
#define _PAGE_TSIZE_4K 0x000100
#define _PAGE_DIRTY 0x001000 /* C: page changed */
#define _PAGE_SW0 0x002000
#define _PAGE_U3 0x004000
@ -46,6 +33,9 @@
#define _PAGE_NO_CACHE 0x400000 /* I: cache inhibit */
#define _PAGE_WRITETHRU 0x800000 /* W: cache write-through */
#define _PAGE_PSIZE_SHIFT 7
#define _PAGE_PSIZE_SHIFT_OFFSET 10
/* "Higher level" linux bit combinations */
#define _PAGE_EXEC (_PAGE_BAP_SX | _PAGE_BAP_UX) /* .. and was cache cleaned */
#define _PAGE_READ (_PAGE_BAP_SR | _PAGE_BAP_UR) /* User read permission */
@ -65,8 +55,6 @@
#define _PAGE_SPECIAL _PAGE_SW0
/* Base page size */
#define _PAGE_PSIZE _PAGE_PSIZE_4K
#define PTE_RPN_SHIFT (24)
#define PTE_WIMGE_SHIFT (19)
@ -89,7 +77,7 @@
* pages. We always set _PAGE_COHERENT when SMP is enabled or
* the processor might need it for DMA coherency.
*/
#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_TSIZE_4K)
#if defined(CONFIG_SMP)
#define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
#else
@ -105,6 +93,47 @@ static inline pte_t pte_mkexec(pte_t pte)
}
#define pte_mkexec pte_mkexec
static inline unsigned long pte_huge_size(pte_t pte)
{
pte_basic_t val = pte_val(pte);
return 1UL << (((val & _PAGE_PSIZE_MSK) >> _PAGE_PSIZE_SHIFT) + _PAGE_PSIZE_SHIFT_OFFSET);
}
#define pte_huge_size pte_huge_size
static inline int pmd_leaf(pmd_t pmd)
{
if (IS_ENABLED(CONFIG_PPC64))
return (long)pmd_val(pmd) > 0;
else
return pmd_val(pmd) & _PAGE_PSIZE_MSK;
}
#define pmd_leaf pmd_leaf
static inline unsigned long pmd_leaf_size(pmd_t pmd)
{
return pte_huge_size(__pte(pmd_val(pmd)));
}
#define pmd_leaf_size pmd_leaf_size
#ifdef CONFIG_PPC64
static inline int pud_leaf(pud_t pud)
{
if (IS_ENABLED(CONFIG_PPC64))
return (long)pud_val(pud) > 0;
else
return pud_val(pud) & _PAGE_PSIZE_MSK;
}
#define pud_leaf pud_leaf
static inline unsigned long pud_leaf_size(pud_t pud)
{
return pte_huge_size(__pte(pud_val(pud)));
}
#define pud_leaf_size pud_leaf_size
#endif
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */

32
arch/powerpc/include/asm/page.h
View File

@ -269,38 +269,6 @@ static inline const void *pfn_to_kaddr(unsigned long pfn)
#define is_kernel_addr(x) ((x) >= TASK_SIZE)
#endif
#ifndef CONFIG_PPC_BOOK3S_64
/*
* Use the top bit of the higher-level page table entries to indicate whether
* the entries we point to contain hugepages. This works because we know that
* the page tables live in kernel space. If we ever decide to support having
* page tables at arbitrary addresses, this breaks and will have to change.
*/
#ifdef CONFIG_PPC64
#define PD_HUGE 0x8000000000000000UL
#else
#define PD_HUGE 0x80000000
#endif
#else /* CONFIG_PPC_BOOK3S_64 */
/*
* Book3S 64 stores real addresses in the hugepd entries to
* avoid overlaps with _PAGE_PRESENT and _PAGE_PTE.
*/
#define HUGEPD_ADDR_MASK (0x0ffffffffffffffful & ~HUGEPD_SHIFT_MASK)
#endif /* CONFIG_PPC_BOOK3S_64 */
/*
* Some number of bits at the level of the page table that points to
* a hugepte are used to encode the size. This masks those bits.
* On 8xx, HW assistance requires 4k alignment for the hugepte.
*/
#ifdef CONFIG_PPC_8xx
#define HUGEPD_SHIFT_MASK 0xfff
#else
#define HUGEPD_SHIFT_MASK 0x3f
#endif
#ifndef __ASSEMBLY__
#ifdef CONFIG_PPC_BOOK3S_64

10
arch/powerpc/include/asm/pgtable-be-types.h
View File

@ -101,14 +101,4 @@ static inline bool pmd_xchg(pmd_t *pmdp, pmd_t old, pmd_t new)
return pmd_raw(old) == prev;
}
#ifdef CONFIG_ARCH_HAS_HUGEPD
typedef struct { __be64 pdbe; } hugepd_t;
#define __hugepd(x) ((hugepd_t) { cpu_to_be64(x) })
static inline unsigned long hpd_val(hugepd_t x)
{
return be64_to_cpu(x.pdbe);
}
#endif
#endif /* _ASM_POWERPC_PGTABLE_BE_TYPES_H */

13
arch/powerpc/include/asm/pgtable-types.h
View File

@ -49,7 +49,11 @@ static inline unsigned long pud_val(pud_t x)
#endif /* CONFIG_PPC64 */
/* PGD level */
#if defined(CONFIG_PPC_E500) && defined(CONFIG_PTE_64BIT)
typedef struct { unsigned long long pgd; } pgd_t;
#else
typedef struct { unsigned long pgd; } pgd_t;
#endif
#define __pgd(x) ((pgd_t) { (x) })
static inline unsigned long pgd_val(pgd_t x)
{
@ -83,13 +87,4 @@ static inline bool pte_xchg(pte_t *ptep, pte_t old, pte_t new)
}
#endif
#ifdef CONFIG_ARCH_HAS_HUGEPD
typedef struct { unsigned long pd; } hugepd_t;
#define __hugepd(x) ((hugepd_t) { (x) })
static inline unsigned long hpd_val(hugepd_t x)
{
return x.pd;
}
#endif
#endif /* _ASM_POWERPC_PGTABLE_TYPES_H */

3
arch/powerpc/include/asm/pgtable.h
View File

@ -106,6 +106,9 @@ unsigned long vmalloc_to_phys(void *vmalloc_addr);
void pgtable_cache_add(unsigned int shift);
#ifdef CONFIG_PPC32
void __init *early_alloc_pgtable(unsigned long size);
#endif
pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)

4
arch/powerpc/kernel/exceptions-64e.S
View File

@ -485,8 +485,8 @@ interrupt_base_book3e: /* fake trap */
EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
EXCEPTION_STUB(0x1c0, data_tlb_miss)
EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
EXCEPTION_STUB(0x1c0, data_tlb_miss_bolted)
EXCEPTION_STUB(0x1e0, instruction_tlb_miss_bolted)
EXCEPTION_STUB(0x200, altivec_unavailable)
EXCEPTION_STUB(0x220, altivec_assist)
EXCEPTION_STUB(0x260, perfmon)

70
arch/powerpc/kernel/head_85xx.S
View File

@ -294,9 +294,10 @@ set_ivor:
/* Macros to hide the PTE size differences
*
* FIND_PTE -- walks the page tables given EA & pgdir pointer
* r10 -- EA of fault
* r10 -- free
* r11 -- PGDIR pointer
* r12 -- free
* r13 -- EA of fault
* label 2: is the bailout case
*
* if we find the pte (fall through):
@ -307,34 +308,34 @@ set_ivor:
#ifdef CONFIG_PTE_64BIT
#ifdef CONFIG_HUGETLB_PAGE
#define FIND_PTE \
rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
rlwinm r12, r13, 14, 18, 28; /* Compute pgdir/pmd offset */ \
add r12, r11, r12; \
lwz r11, 4(r12); /* Get pgd/pmd entry */ \
rlwinm. r10, r11, 32 - _PAGE_PSIZE_SHIFT, 0x1e; /* get tsize*/ \
bne 1000f; /* Huge page (leaf entry) */ \
rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
blt 1000f; /* Normal non-huge page */ \
beq 2f; /* Bail if no table */ \
oris r11, r11, PD_HUGE@h; /* Put back address bit */ \
andi. r10, r11, HUGEPD_SHIFT_MASK@l; /* extract size field */ \
xor r12, r10, r11; /* drop size bits from pointer */ \
b 1001f; \
1000: rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
rlwimi r12, r13, 23, 20, 28; /* Compute pte address */ \
li r10, 0; /* clear r10 */ \
1001: lwz r11, 4(r12); /* Get pte entry */
lwz r11, 4(r12); /* Get pte entry */ \
1000:
#else
#define FIND_PTE \
rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
rlwinm r12, r13, 14, 18, 28; /* Compute pgdir/pmd offset */ \
add r12, r11, r12; \
lwz r11, 4(r12); /* Get pgd/pmd entry */ \
rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
beq 2f; /* Bail if no table */ \
rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
rlwimi r12, r13, 23, 20, 28; /* Compute pte address */ \
lwz r11, 4(r12); /* Get pte entry */
#endif /* HUGEPAGE */
#else /* !PTE_64BIT */
#define FIND_PTE \
rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
rlwimi r11, r13, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
lwz r11, 0(r11); /* Get L1 entry */ \
rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \
beq 2f; /* Bail if no table */ \
rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \
rlwimi r12, r13, 22, 20, 29; /* Compute PTE address */ \
lwz r11, 0(r12); /* Get Linux PTE */
#endif
@ -441,13 +442,13 @@ START_BTB_FLUSH_SECTION
BTB_FLUSH(r10)
1:
END_BTB_FLUSH_SECTION
mfspr r10, SPRN_DEAR /* Get faulting address */
mfspr r13, SPRN_DEAR /* Get faulting address */
/* If we are faulting a kernel address, we have to use the
* kernel page tables.
*/
lis r11, PAGE_OFFSET@h
cmplw 5, r10, r11
cmplw 5, r13, r11
blt 5, 3f
lis r11, swapper_pg_dir@h
ori r11, r11, swapper_pg_dir@l
@ -470,29 +471,14 @@ END_BTB_FLUSH_SECTION
#endif
4:
/* Mask of required permission bits. Note that while we
* do copy ESR:ST to _PAGE_WRITE position as trying to write
* to an RO page is pretty common, we don't do it with
* _PAGE_DIRTY. We could do it, but it's a fairly rare
* event so I'd rather take the overhead when it happens
* rather than adding an instruction here. We should measure
* whether the whole thing is worth it in the first place
* as we could avoid loading SPRN_ESR completely in the first
* place...
*
* TODO: Is it worth doing that mfspr & rlwimi in the first
* place or can we save a couple of instructions here ?
*/
mfspr r12,SPRN_ESR
FIND_PTE
#ifdef CONFIG_PTE_64BIT
li r13,_PAGE_PRESENT|_PAGE_BAP_SR
oris r13,r13,_PAGE_ACCESSED@h
#else
li r13,_PAGE_PRESENT|_PAGE_READ|_PAGE_ACCESSED
#endif
rlwimi r13,r12,11,29,29
FIND_PTE
andc. r13,r13,r11 /* Check permission */
#ifdef CONFIG_PTE_64BIT
@ -549,13 +535,13 @@ START_BTB_FLUSH_SECTION
1:
END_BTB_FLUSH_SECTION
mfspr r10, SPRN_SRR0 /* Get faulting address */
mfspr r13, SPRN_SRR0 /* Get faulting address */
/* If we are faulting a kernel address, we have to use the
* kernel page tables.
*/
lis r11, PAGE_OFFSET@h
cmplw 5, r10, r11
cmplw 5, r13, r11
blt 5, 3f
lis r11, swapper_pg_dir@h
ori r11, r11, swapper_pg_dir@l
@ -564,6 +550,7 @@ END_BTB_FLUSH_SECTION
rlwinm r12,r12,0,16,1
mtspr SPRN_MAS1,r12
FIND_PTE
/* Make up the required permissions for kernel code */
#ifdef CONFIG_PTE_64BIT
li r13,_PAGE_PRESENT | _PAGE_BAP_SX
@ -584,6 +571,7 @@ END_BTB_FLUSH_SECTION
beq 2f /* KUAP fault */
#endif
FIND_PTE
/* Make up the required permissions for user code */
#ifdef CONFIG_PTE_64BIT
li r13,_PAGE_PRESENT | _PAGE_BAP_UX
@ -593,7 +581,6 @@ END_BTB_FLUSH_SECTION
#endif
4:
FIND_PTE
andc. r13,r13,r11 /* Check permission */
#ifdef CONFIG_PTE_64BIT
@ -746,17 +733,12 @@ finish_tlb_load:
lwz r15, 0(r14)
100: stw r15, 0(r17)
/*
* Calc MAS1_TSIZE from r10 (which has pshift encoded)
* tlb_enc = (pshift - 10).
*/
subi r15, r10, 10
mfspr r16, SPRN_MAS1
rlwimi r16, r15, 7, 20, 24
rlwimi r16, r10, MAS1_TSIZE_SHIFT, MAS1_TSIZE_MASK
mtspr SPRN_MAS1, r16
/* copy the pshift for use later */
mr r14, r10
addi r14, r10, _PAGE_PSIZE_SHIFT_OFFSET
/* fall through */

10
arch/powerpc/kernel/head_8xx.S
View File

@ -415,14 +415,13 @@ FixupDAR:/* Entry point for dcbx workaround. */
oris r11, r11, (swapper_pg_dir - PAGE_OFFSET)@ha
3:
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
rlwinm r11, r11, 0, ~_PMD_PAGE_8M
mtspr SPRN_MD_TWC, r11
mtcrf 0x01, r11
mfspr r11, SPRN_MD_TWC
lwz r11, 0(r11) /* Get the pte */
bt 28,200f /* bit 28 = Large page (8M) */
/* concat physical page address(r11) and page offset(r10) */
rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31
201: lwz r11,0(r11)
lwz r11,0(r11)
/* Check if it really is a dcbx instruction. */
/* dcbt and dcbtst does not generate DTLB Misses/Errors,
* no need to include them here */
@ -441,11 +440,6 @@ FixupDAR:/* Entry point for dcbx workaround. */
141: mfspr r10,SPRN_M_TW
b DARFixed /* Nope, go back to normal TLB processing */
200:
/* concat physical page address(r11) and page offset(r10) */
rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31
b 201b
144: mfspr r10, SPRN_DSISR
rlwinm r10, r10,0,7,5 /* Clear store bit for buggy dcbst insn */
mtspr SPRN_DSISR, r10

4
arch/powerpc/kernel/setup_64.c
View File

@ -696,11 +696,7 @@ __init u64 ppc64_bolted_size(void)
{
#ifdef CONFIG_PPC_BOOK3E_64
/* Freescale BookE bolts the entire linear mapping */
/* XXX: BookE ppc64_rma_limit setup seems to disagree? */
if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E))
return linear_map_top;
/* Other BookE, we assume the first GB is bolted */
return 1ul << 30;
#else
/* BookS radix, does not take faults on linear mapping */
if (early_radix_enabled())

11
arch/powerpc/mm/book3s64/hash_utils.c
View File

@ -1233,10 +1233,6 @@ void __init hash__early_init_mmu(void)
__pmd_table_size = H_PMD_TABLE_SIZE;
__pud_table_size = H_PUD_TABLE_SIZE;
__pgd_table_size = H_PGD_TABLE_SIZE;
/*
* 4k use hugepd format, so for hash set then to
* zero
*/
__pmd_val_bits = HASH_PMD_VAL_BITS;
__pud_val_bits = HASH_PUD_VAL_BITS;
__pgd_val_bits = HASH_PGD_VAL_BITS;
@ -1546,6 +1542,13 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea,
goto bail;
}
if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !radix_enabled()) {
if (hugeshift == PMD_SHIFT && psize == MMU_PAGE_16M)
hugeshift = mmu_psize_defs[MMU_PAGE_16M].shift;
if (hugeshift == PUD_SHIFT && psize == MMU_PAGE_16G)
hugeshift = mmu_psize_defs[MMU_PAGE_16G].shift;
}
/*
* Add _PAGE_PRESENT to the required access perm. If there are parallel
* updates to the pte that can possibly clear _PAGE_PTE, catch that too.

10
arch/powerpc/mm/book3s64/hugetlbpage.c
View File

@ -53,6 +53,16 @@ int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
/* If PTE permissions don't match, take page fault */
if (unlikely(!check_pte_access(access, old_pte)))
return 1;
/*
* If hash-4k, hugepages use seeral contiguous PxD entries
* so bail out and let mm make the page young or dirty
*/
if (IS_ENABLED(CONFIG_PPC_4K_PAGES)) {
if (!(old_pte & _PAGE_ACCESSED))
return 1;
if ((access & _PAGE_WRITE) && !(old_pte & _PAGE_DIRTY))
return 1;
}
/*
* Try to lock the PTE, add ACCESSED and DIRTY if it was

12
arch/powerpc/mm/book3s64/pgtable.c
View File

@ -461,18 +461,6 @@ static inline void pgtable_free(void *table, int index)
case PUD_INDEX:
__pud_free(table);
break;
#if defined(CONFIG_PPC_4K_PAGES) && defined(CONFIG_HUGETLB_PAGE)
/* 16M hugepd directory at pud level */
case HTLB_16M_INDEX:
BUILD_BUG_ON(H_16M_CACHE_INDEX <= 0);
kmem_cache_free(PGT_CACHE(H_16M_CACHE_INDEX), table);
break;
/* 16G hugepd directory at the pgd level */
case HTLB_16G_INDEX:
BUILD_BUG_ON(H_16G_CACHE_INDEX <= 0);
kmem_cache_free(PGT_CACHE(H_16G_CACHE_INDEX), table);
break;
#endif
/* We don't free pgd table via RCU callback */
default:
BUG();

453
arch/powerpc/mm/hugetlbpage.c
View File

@ -28,8 +28,6 @@
bool hugetlb_disabled = false;
#define hugepd_none(hpd) (hpd_val(hpd) == 0)
#define PTE_T_ORDER (__builtin_ffs(sizeof(pte_basic_t)) - \
__builtin_ffs(sizeof(void *)))
@ -42,156 +40,43 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long s
return __find_linux_pte(mm->pgd, addr, NULL, NULL);
}
static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
unsigned long address, unsigned int pdshift,
unsigned int pshift, spinlock_t *ptl)
{
struct kmem_cache *cachep;
pte_t *new;
int i;
int num_hugepd;
if (pshift >= pdshift) {
cachep = PGT_CACHE(PTE_T_ORDER);
num_hugepd = 1 << (pshift - pdshift);
} else {
cachep = PGT_CACHE(pdshift - pshift);
num_hugepd = 1;
}
if (!cachep) {
WARN_ONCE(1, "No page table cache created for hugetlb tables");
return -ENOMEM;
}
new = kmem_cache_alloc(cachep, pgtable_gfp_flags(mm, GFP_KERNEL));
BUG_ON(pshift > HUGEPD_SHIFT_MASK);
BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK);
if (!new)
return -ENOMEM;
/*
* Make sure other cpus find the hugepd set only after a
* properly initialized page table is visible to them.
* For more details look for comment in __pte_alloc().
*/
smp_wmb();
spin_lock(ptl);
/*
* We have multiple higher-level entries that point to the same
* actual pte location. Fill in each as we go and backtrack on error.
* We need all of these so the DTLB pgtable walk code can find the
* right higher-level entry without knowing if it's a hugepage or not.
*/
for (i = 0; i < num_hugepd; i++, hpdp++) {
if (unlikely(!hugepd_none(*hpdp)))
break;
hugepd_populate(hpdp, new, pshift);
}
/* If we bailed from the for loop early, an error occurred, clean up */
if (i < num_hugepd) {
for (i = i - 1 ; i >= 0; i--, hpdp--)
*hpdp = __hugepd(0);
kmem_cache_free(cachep, new);
} else {
kmemleak_ignore(new);
}
spin_unlock(ptl);
return 0;
}
/*
* At this point we do the placement change only for BOOK3S 64. This would
* possibly work on other subarchs.
*/
pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pg;
p4d_t *p4;
pud_t *pu;
pmd_t *pm;
hugepd_t *hpdp = NULL;
unsigned pshift = __ffs(sz);
unsigned pdshift = PGDIR_SHIFT;
spinlock_t *ptl;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
addr &= ~(sz - 1);
pg = pgd_offset(mm, addr);
p4 = p4d_offset(pg, addr);
#ifdef CONFIG_PPC_BOOK3S_64
if (pshift == PGDIR_SHIFT)
/* 16GB huge page */
return (pte_t *) p4;
else if (pshift > PUD_SHIFT) {
/*
* We need to use hugepd table
*/
ptl = &mm->page_table_lock;
hpdp = (hugepd_t *)p4;
} else {
pdshift = PUD_SHIFT;
pu = pud_alloc(mm, p4, addr);
if (!pu)
p4d = p4d_offset(pgd_offset(mm, addr), addr);
if (!mm_pud_folded(mm) && sz >= P4D_SIZE)
return (pte_t *)p4d;
pud = pud_alloc(mm, p4d, addr);
if (!pud)
return NULL;
if (pshift == PUD_SHIFT)
return (pte_t *)pu;
else if (pshift > PMD_SHIFT) {
ptl = pud_lockptr(mm, pu);
hpdp = (hugepd_t *)pu;
} else {
pdshift = PMD_SHIFT;
pm = pmd_alloc(mm, pu, addr);
if (!pm)
return NULL;
if (pshift == PMD_SHIFT)
/* 16MB hugepage */
return (pte_t *)pm;
else {
ptl = pmd_lockptr(mm, pm);
hpdp = (hugepd_t *)pm;
}
}
}
#else
if (pshift >= PGDIR_SHIFT) {
ptl = &mm->page_table_lock;
hpdp = (hugepd_t *)p4;
} else {
pdshift = PUD_SHIFT;
pu = pud_alloc(mm, p4, addr);
if (!pu)
return NULL;
if (pshift >= PUD_SHIFT) {
ptl = pud_lockptr(mm, pu);
hpdp = (hugepd_t *)pu;
} else {
pdshift = PMD_SHIFT;
pm = pmd_alloc(mm, pu, addr);
if (!pm)
return NULL;
ptl = pmd_lockptr(mm, pm);
hpdp = (hugepd_t *)pm;
}
}
#endif
if (!hpdp)
if (!mm_pmd_folded(mm) && sz >= PUD_SIZE)
return (pte_t *)pud;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return NULL;
if (IS_ENABLED(CONFIG_PPC_8xx) && pshift < PMD_SHIFT)
return pte_alloc_huge(mm, (pmd_t *)hpdp, addr);
if (sz >= PMD_SIZE) {
/* On 8xx, all hugepages are handled as contiguous PTEs */
if (IS_ENABLED(CONFIG_PPC_8xx)) {
int i;
BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp));
if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr,
pdshift, pshift, ptl))
for (i = 0; i < sz / PMD_SIZE; i++) {
if (!pte_alloc_huge(mm, pmd + i, addr))
return NULL;
}
}
return (pte_t *)pmd;
}
return hugepte_offset(*hpdp, addr, pdshift);
return pte_alloc_huge(mm, pmd, addr);
}
#ifdef CONFIG_PPC_BOOK3S_64
@ -248,264 +133,6 @@ int __init alloc_bootmem_huge_page(struct hstate *h, int nid)
return __alloc_bootmem_huge_page(h, nid);
}
#ifndef CONFIG_PPC_BOOK3S_64
#define HUGEPD_FREELIST_SIZE \
((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t))
struct hugepd_freelist {
struct rcu_head rcu;
unsigned int index;
void *ptes[];
};
static DEFINE_PER_CPU(struct hugepd_freelist *, hugepd_freelist_cur);
static void hugepd_free_rcu_callback(struct rcu_head *head)
{
struct hugepd_freelist *batch =
container_of(head, struct hugepd_freelist, rcu);
unsigned int i;
for (i = 0; i < batch->index; i++)
kmem_cache_free(PGT_CACHE(PTE_T_ORDER), batch->ptes[i]);
free_page((unsigned long)batch);
}
static void hugepd_free(struct mmu_gather *tlb, void *hugepte)
{
struct hugepd_freelist **batchp;
batchp = &get_cpu_var(hugepd_freelist_cur);
if (atomic_read(&tlb->mm->mm_users) < 2 ||
mm_is_thread_local(tlb->mm)) {
kmem_cache_free(PGT_CACHE(PTE_T_ORDER), hugepte);
put_cpu_var(hugepd_freelist_cur);
return;
}
if (*batchp == NULL) {
*batchp = (struct hugepd_freelist *)__get_free_page(GFP_ATOMIC);
(*batchp)->index = 0;
}
(*batchp)->ptes[(*batchp)->index++] = hugepte;
if ((*batchp)->index == HUGEPD_FREELIST_SIZE) {
call_rcu(&(*batchp)->rcu, hugepd_free_rcu_callback);
*batchp = NULL;
}
put_cpu_var(hugepd_freelist_cur);
}
#else
static inline void hugepd_free(struct mmu_gather *tlb, void *hugepte) {}
#endif
/* Return true when the entry to be freed maps more than the area being freed */
static bool range_is_outside_limits(unsigned long start, unsigned long end,
unsigned long floor, unsigned long ceiling,
unsigned long mask)
{
if ((start & mask) < floor)
return true;
if (ceiling) {
ceiling &= mask;
if (!ceiling)
return true;
}
return end - 1 > ceiling - 1;
}
static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift,
unsigned long start, unsigned long end,
unsigned long floor, unsigned long ceiling)
{
pte_t *hugepte = hugepd_page(*hpdp);
int i;
unsigned long pdmask = ~((1UL << pdshift) - 1);
unsigned int num_hugepd = 1;
unsigned int shift = hugepd_shift(*hpdp);
/* Note: On fsl the hpdp may be the first of several */
if (shift > pdshift)
num_hugepd = 1 << (shift - pdshift);
if (range_is_outside_limits(start, end, floor, ceiling, pdmask))
return;
for (i = 0; i < num_hugepd; i++, hpdp++)
*hpdp = __hugepd(0);
if (shift >= pdshift)
hugepd_free(tlb, hugepte);
else
pgtable_free_tlb(tlb, hugepte,
get_hugepd_cache_index(pdshift - shift));
}
static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)
{
pgtable_t token = pmd_pgtable(*pmd);
if (range_is_outside_limits(addr, end, floor, ceiling, PMD_MASK))
return;
pmd_clear(pmd);
pte_free_tlb(tlb, token, addr);
mm_dec_nr_ptes(tlb->mm);
}
static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)
{
pmd_t *pmd;
unsigned long next;
unsigned long start;
start = addr;
do {
unsigned long more;
pmd = pmd_offset(pud, addr);
next = pmd_addr_end(addr, end);
if (!is_hugepd(__hugepd(pmd_val(*pmd)))) {
if (pmd_none_or_clear_bad(pmd))
continue;
/*
* if it is not hugepd pointer, we should already find
* it cleared.
*/
WARN_ON(!IS_ENABLED(CONFIG_PPC_8xx));
hugetlb_free_pte_range(tlb, pmd, addr, end, floor, ceiling);
continue;
}
/*
* Increment next by the size of the huge mapping since
* there may be more than one entry at this level for a
* single hugepage, but all of them point to
* the same kmem cache that holds the hugepte.
*/
more = addr + (1UL << hugepd_shift(*(hugepd_t *)pmd));
if (more > next)
next = more;
free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT,
addr, next, floor, ceiling);
} while (addr = next, addr != end);
if (range_is_outside_limits(start, end, floor, ceiling, PUD_MASK))
return;
pmd = pmd_offset(pud, start & PUD_MASK);
pud_clear(pud);
pmd_free_tlb(tlb, pmd, start & PUD_MASK);
mm_dec_nr_pmds(tlb->mm);
}
static void hugetlb_free_pud_range(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)
{
pud_t *pud;
unsigned long next;
unsigned long start;
start = addr;
do {
pud = pud_offset(p4d, addr);
next = pud_addr_end(addr, end);
if (!is_hugepd(__hugepd(pud_val(*pud)))) {
if (pud_none_or_clear_bad(pud))
continue;
hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
ceiling);
} else {
unsigned long more;
/*
* Increment next by the size of the huge mapping since
* there may be more than one entry at this level for a
* single hugepage, but all of them point to
* the same kmem cache that holds the hugepte.
*/
more = addr + (1UL << hugepd_shift(*(hugepd_t *)pud));
if (more > next)
next = more;
free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT,
addr, next, floor, ceiling);
}
} while (addr = next, addr != end);
if (range_is_outside_limits(start, end, floor, ceiling, PGDIR_MASK))
return;
pud = pud_offset(p4d, start & PGDIR_MASK);
p4d_clear(p4d);
pud_free_tlb(tlb, pud, start & PGDIR_MASK);
mm_dec_nr_puds(tlb->mm);
}
/*
* This function frees user-level page tables of a process.
*/
void hugetlb_free_pgd_range(struct mmu_gather *tlb,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)
{
pgd_t *pgd;
p4d_t *p4d;
unsigned long next;
/*
* Because there are a number of different possible pagetable
* layouts for hugepage ranges, we limit knowledge of how
* things should be laid out to the allocation path
* (huge_pte_alloc(), above). Everything else works out the
* structure as it goes from information in the hugepd
* pointers. That means that we can't here use the
* optimization used in the normal page free_pgd_range(), of
* checking whether we're actually covering a large enough
* range to have to do anything at the top level of the walk
* instead of at the bottom.
*
* To make sense of this, you should probably go read the big
* block comment at the top of the normal free_pgd_range(),
* too.
*/
do {
next = pgd_addr_end(addr, end);
pgd = pgd_offset(tlb->mm, addr);
p4d = p4d_offset(pgd, addr);
if (!is_hugepd(__hugepd(pgd_val(*pgd)))) {
if (p4d_none_or_clear_bad(p4d))
continue;
hugetlb_free_pud_range(tlb, p4d, addr, next, floor, ceiling);
} else {
unsigned long more;
/*
* Increment next by the size of the huge mapping since
* there may be more than one entry at the pgd level
* for a single hugepage, but all of them point to the
* same kmem cache that holds the hugepte.
*/
more = addr + (1UL << hugepd_shift(*(hugepd_t *)pgd));
if (more > next)
next = more;
free_hugepd_range(tlb, (hugepd_t *)p4d, PGDIR_SHIFT,
addr, next, floor, ceiling);
}
} while (addr = next, addr != end);
}
bool __init arch_hugetlb_valid_size(unsigned long size)
{
int shift = __ffs(size);
@ -552,44 +179,14 @@ static int __init hugetlbpage_init(void)
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
unsigned shift;
unsigned pdshift;
if (!mmu_psize_defs[psize].shift)
continue;
shift = mmu_psize_to_shift(psize);
#ifdef CONFIG_PPC_BOOK3S_64
if (shift > PGDIR_SHIFT)
continue;
else if (shift > PUD_SHIFT)
pdshift = PGDIR_SHIFT;
else if (shift > PMD_SHIFT)
pdshift = PUD_SHIFT;
else
pdshift = PMD_SHIFT;
#else
if (shift < PUD_SHIFT)
pdshift = PMD_SHIFT;
else if (shift < PGDIR_SHIFT)
pdshift = PUD_SHIFT;
else
pdshift = PGDIR_SHIFT;
#endif
if (add_huge_page_size(1ULL << shift) < 0)
continue;
/*
* if we have pdshift and shift value same, we don't
* use pgt cache for hugepd.
*/
if (pdshift > shift) {
if (!IS_ENABLED(CONFIG_PPC_8xx))
pgtable_cache_add(pdshift - shift);
} else if (IS_ENABLED(CONFIG_PPC_E500) ||
IS_ENABLED(CONFIG_PPC_8xx)) {
pgtable_cache_add(PTE_T_ORDER);
}
configured = true;
}

8
arch/powerpc/mm/init-common.c
View File

@ -123,12 +123,8 @@ void pgtable_cache_add(unsigned int shift)
/* When batching pgtable pointers for RCU freeing, we store
* the index size in the low bits. Table alignment must be
* big enough to fit it.
*
* Likewise, hugeapge pagetable pointers contain a (different)
* shift value in the low bits. All tables must be aligned so
* as to leave enough 0 bits in the address to contain it. */
unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1,
HUGEPD_SHIFT_MASK + 1);
*/
unsigned long minalign = MAX_PGTABLE_INDEX_SIZE + 1;
struct kmem_cache *new = NULL;
/* It would be nice if this was a BUILD_BUG_ON(), but at the

21
arch/powerpc/mm/kasan/8xx.c
View File

@ -6,28 +6,33 @@
#include <linux/memblock.h>
#include <linux/hugetlb.h>
#include <asm/pgalloc.h>
static int __init
kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block)
{
pmd_t *pmd = pmd_off_k(k_start);
unsigned long k_cur, k_next;
for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) {
pte_basic_t *new;
for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++, block += SZ_4M) {
pte_t *ptep;
int i;
k_next = pgd_addr_end(k_cur, k_end);
k_next = pgd_addr_end(k_next, k_end);
if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
continue;
new = memblock_alloc(sizeof(pte_basic_t), SZ_4K);
if (!new)
ptep = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE);
if (!ptep)
return -ENOMEM;
*new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL)));
for (i = 0; i < PTRS_PER_PTE; i++) {
pte_t pte = pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block + i * PAGE_SIZE)), PAGE_KERNEL));
hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M);
hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M);
__set_pte_at(&init_mm, k_cur, ptep + i, pte, 1);
}
pmd_populate_kernel(&init_mm, pmd, ptep);
*pmd = __pmd(pmd_val(*pmd) | _PMD_PAGE_8M);
}
return 0;
}

43
arch/powerpc/mm/nohash/8xx.c
View File

@ -11,6 +11,7 @@
#include <linux/hugetlb.h>
#include <asm/fixmap.h>
#include <asm/pgalloc.h>
#include <mm/mmu_decl.h>
@ -48,20 +49,6 @@ unsigned long p_block_mapped(phys_addr_t pa)
return 0;
}
static pte_t __init *early_hugepd_alloc_kernel(hugepd_t *pmdp, unsigned long va)
{
if (hpd_val(*pmdp) == 0) {
pte_t *ptep = memblock_alloc(sizeof(pte_basic_t), SZ_4K);
if (!ptep)
return NULL;
hugepd_populate_kernel((hugepd_t *)pmdp, ptep, PAGE_SHIFT_8M);
hugepd_populate_kernel((hugepd_t *)pmdp + 1, ptep, PAGE_SHIFT_8M);
}
return hugepte_offset(*(hugepd_t *)pmdp, va, PGDIR_SHIFT);
}
static int __ref __early_map_kernel_hugepage(unsigned long va, phys_addr_t pa,
pgprot_t prot, int psize, bool new)
{
@ -75,26 +62,36 @@ static int __ref __early_map_kernel_hugepage(unsigned long va, phys_addr_t pa,
if (WARN_ON(slab_is_available()))
return -EINVAL;
if (psize == MMU_PAGE_512K)
if (psize == MMU_PAGE_512K) {
ptep = early_pte_alloc_kernel(pmdp, va);
else
ptep = early_hugepd_alloc_kernel((hugepd_t *)pmdp, va);
/* The PTE should never be already present */
if (WARN_ON(pte_present(*ptep) && pgprot_val(prot)))
return -EINVAL;
} else {
if (WARN_ON(!pmd_none(*pmdp) || !pmd_none(*(pmdp + 1))))
return -EINVAL;
ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
pmd_populate_kernel(&init_mm, pmdp, ptep);
ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
pmd_populate_kernel(&init_mm, pmdp + 1, ptep);
ptep = (pte_t *)pmdp;
}
} else {
if (psize == MMU_PAGE_512K)
ptep = pte_offset_kernel(pmdp, va);
else
ptep = hugepte_offset(*(hugepd_t *)pmdp, va, PGDIR_SHIFT);
ptep = (pte_t *)pmdp;
}
if (WARN_ON(!ptep))
return -ENOMEM;
/* The PTE should never be already present */
if (new && WARN_ON(pte_present(*ptep) && pgprot_val(prot)))
return -EINVAL;
set_huge_pte_at(&init_mm, va, ptep,
pte_mkhuge(pfn_pte(pa >> PAGE_SHIFT, prot)), psize);
pte_mkhuge(pfn_pte(pa >> PAGE_SHIFT, prot)),
1UL << mmu_psize_to_shift(psize));
return 0;
}

2
arch/powerpc/mm/nohash/Makefile
View File

@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += mmu_context.o tlb.o tlb_low.o kup.o
obj-$(CONFIG_PPC_BOOK3E_64) += tlb_low_64e.o book3e_pgtable.o
obj-$(CONFIG_PPC_BOOK3E_64) += tlb_64e.o tlb_low_64e.o book3e_pgtable.o
obj-$(CONFIG_44x) += 44x.o
obj-$(CONFIG_PPC_8xx) += 8xx.o
obj-$(CONFIG_PPC_E500) += e500.o

4
arch/powerpc/mm/nohash/book3e_pgtable.c
View File

@ -29,10 +29,10 @@ int __meminit vmemmap_create_mapping(unsigned long start,
_PAGE_KERNEL_RW;
/* PTEs only contain page size encodings up to 32M */
BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf);
BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].shift - 10 > 0xf);
/* Encode the size in the PTE */
flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8;
flags |= (mmu_psize_defs[mmu_vmemmap_psize].shift - 10) << 8;
/* For each PTE for that area, map things. Note that we don't
* increment phys because all PTEs are of the large size and

407
arch/powerpc/mm/nohash/tlb.c
View File

@ -53,37 +53,30 @@
struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
[MMU_PAGE_4K] = {
.shift = 12,
.enc = BOOK3E_PAGESZ_4K,
},
[MMU_PAGE_2M] = {
.shift = 21,
.enc = BOOK3E_PAGESZ_2M,
},
[MMU_PAGE_4M] = {
.shift = 22,
.enc = BOOK3E_PAGESZ_4M,
},
[MMU_PAGE_16M] = {
.shift = 24,
.enc = BOOK3E_PAGESZ_16M,
},
[MMU_PAGE_64M] = {
.shift = 26,
.enc = BOOK3E_PAGESZ_64M,
},
[MMU_PAGE_256M] = {
.shift = 28,
.enc = BOOK3E_PAGESZ_256M,
},
[MMU_PAGE_1G] = {
.shift = 30,
.enc = BOOK3E_PAGESZ_1GB,
},
};
static inline int mmu_get_tsize(int psize)
{
return mmu_psize_defs[psize].enc;
return mmu_psize_defs[psize].shift - 10;
}
#else
static inline int mmu_get_tsize(int psize)
@ -110,28 +103,6 @@ struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT] = {
};
#endif
/* The variables below are currently only used on 64-bit Book3E
* though this will probably be made common with other nohash
* implementations at some point
*/
#ifdef CONFIG_PPC64
int mmu_pte_psize; /* Page size used for PTE pages */
int mmu_vmemmap_psize; /* Page size used for the virtual mem map */
int book3e_htw_mode; /* HW tablewalk? Value is PPC_HTW_* */
unsigned long linear_map_top; /* Top of linear mapping */
/*
* Number of bytes to add to SPRN_SPRG_TLB_EXFRAME on crit/mcheck/debug
* exceptions. This is used for bolted and e6500 TLB miss handlers which
* do not modify this SPRG in the TLB miss code; for other TLB miss handlers,
* this is set to zero.
*/
int extlb_level_exc;
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC_E500
/* next_tlbcam_idx is used to round-robin tlbcam entry assignment */
DEFINE_PER_CPU(int, next_tlbcam_idx);
@ -358,381 +329,7 @@ void tlb_flush(struct mmu_gather *tlb)
flush_tlb_mm(tlb->mm);
}
/*
* Below are functions specific to the 64-bit variant of Book3E though that
* may change in the future
*/
#ifdef CONFIG_PPC64
/*
* Handling of virtual linear page tables or indirect TLB entries
* flushing when PTE pages are freed
*/
void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address)
{
int tsize = mmu_psize_defs[mmu_pte_psize].enc;
if (book3e_htw_mode != PPC_HTW_NONE) {
unsigned long start = address & PMD_MASK;
unsigned long end = address + PMD_SIZE;
unsigned long size = 1UL << mmu_psize_defs[mmu_pte_psize].shift;
/* This isn't the most optimal, ideally we would factor out the
* while preempt & CPU mask mucking around, or even the IPI but
* it will do for now
*/
while (start < end) {
__flush_tlb_page(tlb->mm, start, tsize, 1);
start += size;
}
} else {
unsigned long rmask = 0xf000000000000000ul;
unsigned long rid = (address & rmask) | 0x1000000000000000ul;
unsigned long vpte = address & ~rmask;
vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful;
vpte |= rid;
__flush_tlb_page(tlb->mm, vpte, tsize, 0);
}
}
static void __init setup_page_sizes(void)
{
unsigned int tlb0cfg;
unsigned int tlb0ps;
unsigned int eptcfg;
int i, psize;
#ifdef CONFIG_PPC_E500
unsigned int mmucfg = mfspr(SPRN_MMUCFG);
int fsl_mmu = mmu_has_feature(MMU_FTR_TYPE_FSL_E);
if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG);
unsigned int min_pg, max_pg;
min_pg = (tlb1cfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT;
max_pg = (tlb1cfg & TLBnCFG_MAXSIZE) >> TLBnCFG_MAXSIZE_SHIFT;
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def;
unsigned int shift;
def = &mmu_psize_defs[psize];
shift = def->shift;
if (shift == 0 || shift & 1)
continue;
/* adjust to be in terms of 4^shift Kb */
shift = (shift - 10) >> 1;
if ((shift >= min_pg) && (shift <= max_pg))
def->flags |= MMU_PAGE_SIZE_DIRECT;
}
goto out;
}
if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) {
u32 tlb1cfg, tlb1ps;
tlb0cfg = mfspr(SPRN_TLB0CFG);
tlb1cfg = mfspr(SPRN_TLB1CFG);
tlb1ps = mfspr(SPRN_TLB1PS);
eptcfg = mfspr(SPRN_EPTCFG);
if ((tlb1cfg & TLBnCFG_IND) && (tlb0cfg & TLBnCFG_PT))
book3e_htw_mode = PPC_HTW_E6500;
/*
* We expect 4K subpage size and unrestricted indirect size.
* The lack of a restriction on indirect size is a Freescale
* extension, indicated by PSn = 0 but SPSn != 0.
*/
if (eptcfg != 2)
book3e_htw_mode = PPC_HTW_NONE;
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def = &mmu_psize_defs[psize];
if (!def->shift)
continue;
if (tlb1ps & (1U << (def->shift - 10))) {
def->flags |= MMU_PAGE_SIZE_DIRECT;
if (book3e_htw_mode && psize == MMU_PAGE_2M)
def->flags |= MMU_PAGE_SIZE_INDIRECT;
}
}
goto out;
}
#endif
tlb0cfg = mfspr(SPRN_TLB0CFG);
tlb0ps = mfspr(SPRN_TLB0PS);
eptcfg = mfspr(SPRN_EPTCFG);
/* Look for supported direct sizes */
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def = &mmu_psize_defs[psize];
if (tlb0ps & (1U << (def->shift - 10)))
def->flags |= MMU_PAGE_SIZE_DIRECT;
}
/* Indirect page sizes supported ? */
if ((tlb0cfg & TLBnCFG_IND) == 0 ||
(tlb0cfg & TLBnCFG_PT) == 0)
goto out;
book3e_htw_mode = PPC_HTW_IBM;
/* Now, we only deal with one IND page size for each
* direct size. Hopefully all implementations today are
* unambiguous, but we might want to be careful in the
* future.
*/
for (i = 0; i < 3; i++) {
unsigned int ps, sps;
sps = eptcfg & 0x1f;
eptcfg >>= 5;
ps = eptcfg & 0x1f;
eptcfg >>= 5;
if (!ps || !sps)
continue;
for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
struct mmu_psize_def *def = &mmu_psize_defs[psize];
if (ps == (def->shift - 10))
def->flags |= MMU_PAGE_SIZE_INDIRECT;
if (sps == (def->shift - 10))
def->ind = ps + 10;
}
}
out:
/* Cleanup array and print summary */
pr_info("MMU: Supported page sizes\n");
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def = &mmu_psize_defs[psize];
const char *__page_type_names[] = {
"unsupported",
"direct",
"indirect",
"direct & indirect"
};
if (def->flags == 0) {
def->shift = 0;
continue;
}
pr_info(" %8ld KB as %s\n", 1ul << (def->shift - 10),
__page_type_names[def->flags & 0x3]);
}
}
static void __init setup_mmu_htw(void)
{
/*
* If we want to use HW tablewalk, enable it by patching the TLB miss
* handlers to branch to the one dedicated to it.
*/
switch (book3e_htw_mode) {
case PPC_HTW_IBM:
patch_exception(0x1c0, exc_data_tlb_miss_htw_book3e);
patch_exception(0x1e0, exc_instruction_tlb_miss_htw_book3e);
break;
#ifdef CONFIG_PPC_E500
case PPC_HTW_E6500:
extlb_level_exc = EX_TLB_SIZE;
patch_exception(0x1c0, exc_data_tlb_miss_e6500_book3e);
patch_exception(0x1e0, exc_instruction_tlb_miss_e6500_book3e);
break;
#endif
}
pr_info("MMU: Book3E HW tablewalk %s\n",
book3e_htw_mode != PPC_HTW_NONE ? "enabled" : "not supported");
}
/*
* Early initialization of the MMU TLB code
*/
static void early_init_this_mmu(void)
{
unsigned int mas4;
/* Set MAS4 based on page table setting */
mas4 = 0x4 << MAS4_WIMGED_SHIFT;
switch (book3e_htw_mode) {
case PPC_HTW_E6500:
mas4 |= MAS4_INDD;
mas4 |= BOOK3E_PAGESZ_2M << MAS4_TSIZED_SHIFT;
mas4 |= MAS4_TLBSELD(1);
mmu_pte_psize = MMU_PAGE_2M;
break;
case PPC_HTW_IBM:
mas4 |= MAS4_INDD;
mas4 |= BOOK3E_PAGESZ_1M << MAS4_TSIZED_SHIFT;
mmu_pte_psize = MMU_PAGE_1M;
break;
case PPC_HTW_NONE:
mas4 |= BOOK3E_PAGESZ_4K << MAS4_TSIZED_SHIFT;
mmu_pte_psize = mmu_virtual_psize;
break;
}
mtspr(SPRN_MAS4, mas4);
#ifdef CONFIG_PPC_E500
if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
unsigned int num_cams;
bool map = true;
/* use a quarter of the TLBCAM for bolted linear map */
num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
/*
* Only do the mapping once per core, or else the
* transient mapping would cause problems.
*/
#ifdef CONFIG_SMP
if (hweight32(get_tensr()) > 1)
map = false;
#endif
if (map)
linear_map_top = map_mem_in_cams(linear_map_top,
num_cams, false, true);
}
#endif
/* A sync won't hurt us after mucking around with
* the MMU configuration
*/
mb();
}
static void __init early_init_mmu_global(void)
{
/* XXX This should be decided at runtime based on supported
* page sizes in the TLB, but for now let's assume 16M is
* always there and a good fit (which it probably is)
*
* Freescale booke only supports 4K pages in TLB0, so use that.
*/
if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
mmu_vmemmap_psize = MMU_PAGE_4K;
else
mmu_vmemmap_psize = MMU_PAGE_16M;
/* XXX This code only checks for TLB 0 capabilities and doesn't
* check what page size combos are supported by the HW. It
* also doesn't handle the case where a separate array holds
* the IND entries from the array loaded by the PT.
*/
/* Look for supported page sizes */
setup_page_sizes();
/* Look for HW tablewalk support */
setup_mmu_htw();
#ifdef CONFIG_PPC_E500
if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
if (book3e_htw_mode == PPC_HTW_NONE) {
extlb_level_exc = EX_TLB_SIZE;
patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
patch_exception(0x1e0,
exc_instruction_tlb_miss_bolted_book3e);
}
}
#endif
/* Set the global containing the top of the linear mapping
* for use by the TLB miss code
*/
linear_map_top = memblock_end_of_DRAM();
ioremap_bot = IOREMAP_BASE;
}
static void __init early_mmu_set_memory_limit(void)
{
#ifdef CONFIG_PPC_E500
if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
/*
* Limit memory so we dont have linear faults.
* Unlike memblock_set_current_limit, which limits
* memory available during early boot, this permanently
* reduces the memory available to Linux. We need to
* do this because highmem is not supported on 64-bit.
*/
memblock_enforce_memory_limit(linear_map_top);
}
#endif
memblock_set_current_limit(linear_map_top);
}
/* boot cpu only */
void __init early_init_mmu(void)
{
early_init_mmu_global();
early_init_this_mmu();
early_mmu_set_memory_limit();
}
void early_init_mmu_secondary(void)
{
early_init_this_mmu();
}
void setup_initial_memory_limit(phys_addr_t first_memblock_base,
phys_addr_t first_memblock_size)
{
/* On non-FSL Embedded 64-bit, we adjust the RMA size to match
* the bolted TLB entry. We know for now that only 1G
* entries are supported though that may eventually
* change.
*
* on FSL Embedded 64-bit, usually all RAM is bolted, but with
* unusual memory sizes it's possible for some RAM to not be mapped
* (such RAM is not used at all by Linux, since we don't support
* highmem on 64-bit). We limit ppc64_rma_size to what would be
* mappable if this memblock is the only one. Additional memblocks
* can only increase, not decrease, the amount that ends up getting
* mapped. We still limit max to 1G even if we'll eventually map
* more. This is due to what the early init code is set up to do.
*
* We crop it to the size of the first MEMBLOCK to
* avoid going over total available memory just in case...
*/
#ifdef CONFIG_PPC_E500
if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
unsigned long linear_sz;
unsigned int num_cams;
/* use a quarter of the TLBCAM for bolted linear map */
num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
linear_sz = map_mem_in_cams(first_memblock_size, num_cams,
true, true);
ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
} else
#endif
ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000);
/* Finally limit subsequent allocations */
memblock_set_current_limit(first_memblock_base + ppc64_rma_size);
}
#else /* ! CONFIG_PPC64 */
#ifndef CONFIG_PPC64
void __init early_init_mmu(void)
{
unsigned long root = of_get_flat_dt_root();

314
arch/powerpc/mm/nohash/tlb_64e.c Normal file
View File

@ -0,0 +1,314 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2008,2009 Ben Herrenschmidt <benh@kernel.crashing.org>
* IBM Corp.
*
* Derived from arch/ppc/mm/init.c:
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/memblock.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/tlb.h>
#include <asm/code-patching.h>
#include <asm/cputhreads.h>
#include <mm/mmu_decl.h>
/* The variables below are currently only used on 64-bit Book3E
* though this will probably be made common with other nohash
* implementations at some point
*/
int mmu_pte_psize; /* Page size used for PTE pages */
int mmu_vmemmap_psize; /* Page size used for the virtual mem map */
int book3e_htw_mode; /* HW tablewalk? Value is PPC_HTW_* */
unsigned long linear_map_top; /* Top of linear mapping */
/*
* Number of bytes to add to SPRN_SPRG_TLB_EXFRAME on crit/mcheck/debug
* exceptions. This is used for bolted and e6500 TLB miss handlers which
* do not modify this SPRG in the TLB miss code; for other TLB miss handlers,
* this is set to zero.
*/
int extlb_level_exc;
/*
* Handling of virtual linear page tables or indirect TLB entries
* flushing when PTE pages are freed
*/
void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address)
{
int tsize = mmu_psize_defs[mmu_pte_psize].shift - 10;
if (book3e_htw_mode != PPC_HTW_NONE) {
unsigned long start = address & PMD_MASK;
unsigned long end = address + PMD_SIZE;
unsigned long size = 1UL << mmu_psize_defs[mmu_pte_psize].shift;
/* This isn't the most optimal, ideally we would factor out the
* while preempt & CPU mask mucking around, or even the IPI but
* it will do for now
*/
while (start < end) {
__flush_tlb_page(tlb->mm, start, tsize, 1);
start += size;
}
} else {
unsigned long rmask = 0xf000000000000000ul;
unsigned long rid = (address & rmask) | 0x1000000000000000ul;
unsigned long vpte = address & ~rmask;
vpte = (vpte >> (PAGE_SHIFT - 3)) & ~0xffful;
vpte |= rid;
__flush_tlb_page(tlb->mm, vpte, tsize, 0);
}
}
static void __init setup_page_sizes(void)
{
unsigned int tlb0cfg;
unsigned int eptcfg;
int psize;
unsigned int mmucfg = mfspr(SPRN_MMUCFG);
if ((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG);
unsigned int min_pg, max_pg;
min_pg = (tlb1cfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT;
max_pg = (tlb1cfg & TLBnCFG_MAXSIZE) >> TLBnCFG_MAXSIZE_SHIFT;
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def;
unsigned int shift;
def = &mmu_psize_defs[psize];
shift = def->shift;
if (shift == 0 || shift & 1)
continue;
/* adjust to be in terms of 4^shift Kb */
shift = (shift - 10) >> 1;
if ((shift >= min_pg) && (shift <= max_pg))
def->flags |= MMU_PAGE_SIZE_DIRECT;
}
goto out;
}
if ((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) {
u32 tlb1cfg, tlb1ps;
tlb0cfg = mfspr(SPRN_TLB0CFG);
tlb1cfg = mfspr(SPRN_TLB1CFG);
tlb1ps = mfspr(SPRN_TLB1PS);
eptcfg = mfspr(SPRN_EPTCFG);
if ((tlb1cfg & TLBnCFG_IND) && (tlb0cfg & TLBnCFG_PT))
book3e_htw_mode = PPC_HTW_E6500;
/*
* We expect 4K subpage size and unrestricted indirect size.
* The lack of a restriction on indirect size is a Freescale
* extension, indicated by PSn = 0 but SPSn != 0.
*/
if (eptcfg != 2)
book3e_htw_mode = PPC_HTW_NONE;
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def = &mmu_psize_defs[psize];
if (!def->shift)
continue;
if (tlb1ps & (1U << (def->shift - 10))) {
def->flags |= MMU_PAGE_SIZE_DIRECT;
if (book3e_htw_mode && psize == MMU_PAGE_2M)
def->flags |= MMU_PAGE_SIZE_INDIRECT;
}
}
goto out;
}
out:
/* Cleanup array and print summary */
pr_info("MMU: Supported page sizes\n");
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
struct mmu_psize_def *def = &mmu_psize_defs[psize];
const char *__page_type_names[] = {
"unsupported",
"direct",
"indirect",
"direct & indirect"
};
if (def->flags == 0) {
def->shift = 0;
continue;
}
pr_info(" %8ld KB as %s\n", 1ul << (def->shift - 10),
__page_type_names[def->flags & 0x3]);
}
}
/*
* Early initialization of the MMU TLB code
*/
static void early_init_this_mmu(void)
{
unsigned int mas4;
/* Set MAS4 based on page table setting */
mas4 = 0x4 << MAS4_WIMGED_SHIFT;
switch (book3e_htw_mode) {
case PPC_HTW_E6500:
mas4 |= MAS4_INDD;
mas4 |= BOOK3E_PAGESZ_2M << MAS4_TSIZED_SHIFT;
mas4 |= MAS4_TLBSELD(1);
mmu_pte_psize = MMU_PAGE_2M;
break;
case PPC_HTW_NONE:
mas4 |= BOOK3E_PAGESZ_4K << MAS4_TSIZED_SHIFT;
mmu_pte_psize = mmu_virtual_psize;
break;
}
mtspr(SPRN_MAS4, mas4);
unsigned int num_cams;
bool map = true;
/* use a quarter of the TLBCAM for bolted linear map */
num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
/*
* Only do the mapping once per core, or else the
* transient mapping would cause problems.
*/
#ifdef CONFIG_SMP
if (hweight32(get_tensr()) > 1)
map = false;
#endif
if (map)
linear_map_top = map_mem_in_cams(linear_map_top,
num_cams, false, true);
/* A sync won't hurt us after mucking around with
* the MMU configuration
*/
mb();
}
static void __init early_init_mmu_global(void)
{
/*
* Freescale booke only supports 4K pages in TLB0, so use that.
*/
mmu_vmemmap_psize = MMU_PAGE_4K;
/* XXX This code only checks for TLB 0 capabilities and doesn't
* check what page size combos are supported by the HW. It
* also doesn't handle the case where a separate array holds
* the IND entries from the array loaded by the PT.
*/
/* Look for supported page sizes */
setup_page_sizes();
/*
* If we want to use HW tablewalk, enable it by patching the TLB miss
* handlers to branch to the one dedicated to it.
*/
extlb_level_exc = EX_TLB_SIZE;
switch (book3e_htw_mode) {
case PPC_HTW_E6500:
patch_exception(0x1c0, exc_data_tlb_miss_e6500_book3e);
patch_exception(0x1e0, exc_instruction_tlb_miss_e6500_book3e);
break;
}
pr_info("MMU: Book3E HW tablewalk %s\n",
book3e_htw_mode != PPC_HTW_NONE ? "enabled" : "not supported");
/* Set the global containing the top of the linear mapping
* for use by the TLB miss code
*/
linear_map_top = memblock_end_of_DRAM();
ioremap_bot = IOREMAP_BASE;
}
static void __init early_mmu_set_memory_limit(void)
{
/*
* Limit memory so we dont have linear faults.
* Unlike memblock_set_current_limit, which limits
* memory available during early boot, this permanently
* reduces the memory available to Linux. We need to
* do this because highmem is not supported on 64-bit.
*/
memblock_enforce_memory_limit(linear_map_top);
memblock_set_current_limit(linear_map_top);
}
/* boot cpu only */
void __init early_init_mmu(void)
{
early_init_mmu_global();
early_init_this_mmu();
early_mmu_set_memory_limit();
}
void early_init_mmu_secondary(void)
{
early_init_this_mmu();
}
void setup_initial_memory_limit(phys_addr_t first_memblock_base,
phys_addr_t first_memblock_size)
{
/*
* On FSL Embedded 64-bit, usually all RAM is bolted, but with
* unusual memory sizes it's possible for some RAM to not be mapped
* (such RAM is not used at all by Linux, since we don't support
* highmem on 64-bit). We limit ppc64_rma_size to what would be
* mappable if this memblock is the only one. Additional memblocks
* can only increase, not decrease, the amount that ends up getting
* mapped. We still limit max to 1G even if we'll eventually map
* more. This is due to what the early init code is set up to do.
*
* We crop it to the size of the first MEMBLOCK to
* avoid going over total available memory just in case...
*/
unsigned long linear_sz;
unsigned int num_cams;
/* use a quarter of the TLBCAM for bolted linear map */
num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
linear_sz = map_mem_in_cams(first_memblock_size, num_cams, true, true);
ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
/* Finally limit subsequent allocations */
memblock_set_current_limit(first_memblock_base + ppc64_rma_size);
}

428
arch/powerpc/mm/nohash/tlb_low_64e.S
View File

@ -450,11 +450,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SMT)
tlb_miss_huge_e6500:
beq tlb_miss_fault_e6500
li r10,1
andi. r15,r14,HUGEPD_SHIFT_MASK@l /* r15 = psize */
rldimi r14,r10,63,0 /* Set PD_HUGE */
xor r14,r14,r15 /* Clear size bits */
ldx r14,0,r14
rlwinm r15,r14,32-_PAGE_PSIZE_SHIFT,0x1e
/*
* Now we build the MAS for a huge page.
@ -465,7 +461,6 @@ tlb_miss_huge_e6500:
* MAS 2,3+7: Needs to be redone similar to non-tablewalk handler
*/
subi r15,r15,10 /* Convert psize to tsize */
mfspr r10,SPRN_MAS1
rlwinm r10,r10,0,~MAS1_IND
rlwimi r10,r15,MAS1_TSIZE_SHIFT,MAS1_TSIZE_MASK
@ -511,232 +506,6 @@ itlb_miss_fault_e6500:
tlb_epilog_bolted
b exc_instruction_storage_book3e
/**********************************************************************
* *
* TLB miss handling for Book3E with TLB reservation and HES support *
* *
**********************************************************************/
/* Data TLB miss */
START_EXCEPTION(data_tlb_miss)
TLB_MISS_PROLOG
/* Now we handle the fault proper. We only save DEAR in normal
* fault case since that's the only interesting values here.
* We could probably also optimize by not saving SRR0/1 in the
* linear mapping case but I'll leave that for later
*/
mfspr r14,SPRN_ESR
mfspr r16,SPRN_DEAR /* get faulting address */
srdi r15,r16,44 /* get region */
xoris r15,r15,0xc
cmpldi cr0,r15,0 /* linear mapping ? */
beq tlb_load_linear /* yes -> go to linear map load */
cmpldi cr1,r15,1 /* vmalloc mapping ? */
/* The page tables are mapped virtually linear. At this point, though,
* we don't know whether we are trying to fault in a first level
* virtual address or a virtual page table address. We can get that
* from bit 0x1 of the region ID which we have set for a page table
*/
andis. r10,r15,0x1
bne- virt_page_table_tlb_miss
std r14,EX_TLB_ESR(r12); /* save ESR */
std r16,EX_TLB_DEAR(r12); /* save DEAR */
/* We need _PAGE_PRESENT and _PAGE_ACCESSED set */
li r11,_PAGE_PRESENT
oris r11,r11,_PAGE_ACCESSED@h
/* We do the user/kernel test for the PID here along with the RW test
*/
srdi. r15,r16,60 /* Check for user region */
/* We pre-test some combination of permissions to avoid double
* faults:
*
* We move the ESR:ST bit into the position of _PAGE_BAP_SW in the PTE
* ESR_ST is 0x00800000
* _PAGE_BAP_SW is 0x00000010
* So the shift is >> 19. This tests for supervisor writeability.
* If the page happens to be supervisor writeable and not user
* writeable, we will take a new fault later, but that should be
* a rare enough case.
*
* We also move ESR_ST in _PAGE_DIRTY position
* _PAGE_DIRTY is 0x00001000 so the shift is >> 11
*
* MAS1 is preset for all we need except for TID that needs to
* be cleared for kernel translations
*/
rlwimi r11,r14,32-19,27,27
rlwimi r11,r14,32-16,19,19
beq normal_tlb_miss_user
/* XXX replace the RMW cycles with immediate loads + writes */
1: mfspr r10,SPRN_MAS1
rlwinm r10,r10,0,16,1 /* Clear TID */
mtspr SPRN_MAS1,r10
beq+ cr1,normal_tlb_miss
/* We got a crappy address, just fault with whatever DEAR and ESR
* are here
*/
TLB_MISS_EPILOG_ERROR
b exc_data_storage_book3e
/* Instruction TLB miss */
START_EXCEPTION(instruction_tlb_miss)
TLB_MISS_PROLOG
/* If we take a recursive fault, the second level handler may need
* to know whether we are handling a data or instruction fault in
* order to get to the right store fault handler. We provide that
* info by writing a crazy value in ESR in our exception frame
*/
li r14,-1 /* store to exception frame is done later */
/* Now we handle the fault proper. We only save DEAR in the non
* linear mapping case since we know the linear mapping case will
* not re-enter. We could indeed optimize and also not save SRR0/1
* in the linear mapping case but I'll leave that for later
*
* Faulting address is SRR0 which is already in r16
*/
srdi r15,r16,44 /* get region */
xoris r15,r15,0xc
cmpldi cr0,r15,0 /* linear mapping ? */
beq tlb_load_linear /* yes -> go to linear map load */
cmpldi cr1,r15,1 /* vmalloc mapping ? */
/* We do the user/kernel test for the PID here along with the RW test
*/
li r11,_PAGE_PRESENT|_PAGE_BAP_UX /* Base perm */
oris r11,r11,_PAGE_ACCESSED@h
srdi. r15,r16,60 /* Check for user region */
std r14,EX_TLB_ESR(r12) /* write crazy -1 to frame */
beq normal_tlb_miss_user
li r11,_PAGE_PRESENT|_PAGE_BAP_SX /* Base perm */
oris r11,r11,_PAGE_ACCESSED@h
/* XXX replace the RMW cycles with immediate loads + writes */
mfspr r10,SPRN_MAS1
rlwinm r10,r10,0,16,1 /* Clear TID */
mtspr SPRN_MAS1,r10
beq+ cr1,normal_tlb_miss
/* We got a crappy address, just fault */
TLB_MISS_EPILOG_ERROR
b exc_instruction_storage_book3e
/*
* This is the guts of the first-level TLB miss handler for direct
* misses. We are entered with:
*
* r16 = faulting address
* r15 = region ID
* r14 = crap (free to use)
* r13 = PACA
* r12 = TLB exception frame in PACA
* r11 = PTE permission mask
* r10 = crap (free to use)
*/
normal_tlb_miss_user:
#ifdef CONFIG_PPC_KUAP
mfspr r14,SPRN_MAS1
rlwinm. r14,r14,0,0x3fff0000
beq- normal_tlb_miss_access_fault /* KUAP fault */
#endif
normal_tlb_miss:
/* So we first construct the page table address. We do that by
* shifting the bottom of the address (not the region ID) by
* PAGE_SHIFT-3, clearing the bottom 3 bits (get a PTE ptr) and
* or'ing the fourth high bit.
*
* NOTE: For 64K pages, we do things slightly differently in
* order to handle the weird page table format used by linux
*/
srdi r15,r16,44
oris r10,r15,0x1
rldicl r14,r16,64-(PAGE_SHIFT-3),PAGE_SHIFT-3+4
sldi r15,r10,44
clrrdi r14,r14,19
or r10,r15,r14
ld r14,0(r10)
finish_normal_tlb_miss:
/* Check if required permissions are met */
andc. r15,r11,r14
bne- normal_tlb_miss_access_fault
/* Now we build the MAS:
*
* MAS 0 : Fully setup with defaults in MAS4 and TLBnCFG
* MAS 1 : Almost fully setup
* - PID already updated by caller if necessary
* - TSIZE need change if !base page size, not
* yet implemented for now
* MAS 2 : Defaults not useful, need to be redone
* MAS 3+7 : Needs to be done
*
* TODO: mix up code below for better scheduling
*/
clrrdi r10,r16,12 /* Clear low crap in EA */
rlwimi r10,r14,32-19,27,31 /* Insert WIMGE */
mtspr SPRN_MAS2,r10
/* Check page size, if not standard, update MAS1 */
rldicl r10,r14,64-8,64-8
cmpldi cr0,r10,BOOK3E_PAGESZ_4K
beq- 1f
mfspr r11,SPRN_MAS1
rlwimi r11,r14,31,21,24
rlwinm r11,r11,0,21,19
mtspr SPRN_MAS1,r11
1:
/* Move RPN in position */
rldicr r11,r14,64-(PTE_RPN_SHIFT-PAGE_SHIFT),63-PAGE_SHIFT
clrldi r15,r11,12 /* Clear crap at the top */
rlwimi r15,r14,32-8,22,25 /* Move in U bits */
rlwimi r15,r14,32-2,26,31 /* Move in BAP bits */
/* Mask out SW and UW if !DIRTY (XXX optimize this !) */
andi. r11,r14,_PAGE_DIRTY
bne 1f
li r11,MAS3_SW|MAS3_UW
andc r15,r15,r11
1:
srdi r16,r15,32
mtspr SPRN_MAS3,r15
mtspr SPRN_MAS7,r16
tlbwe
normal_tlb_miss_done:
/* We don't bother with restoring DEAR or ESR since we know we are
* level 0 and just going back to userland. They are only needed
* if you are going to take an access fault
*/
TLB_MISS_EPILOG_SUCCESS
rfi
normal_tlb_miss_access_fault:
/* We need to check if it was an instruction miss */
andi. r10,r11,_PAGE_BAP_UX
bne 1f
ld r14,EX_TLB_DEAR(r12)
ld r15,EX_TLB_ESR(r12)
mtspr SPRN_DEAR,r14
mtspr SPRN_ESR,r15
TLB_MISS_EPILOG_ERROR
b exc_data_storage_book3e
1: TLB_MISS_EPILOG_ERROR
b exc_instruction_storage_book3e
/*
* This is the guts of the second-level TLB miss handler for direct
* misses. We are entered with:
@ -893,201 +662,6 @@ virt_page_table_tlb_miss_whacko_fault:
TLB_MISS_EPILOG_ERROR
b exc_data_storage_book3e
/**************************************************************
* *
* TLB miss handling for Book3E with hw page table support *
* *
**************************************************************/
/* Data TLB miss */
START_EXCEPTION(data_tlb_miss_htw)
TLB_MISS_PROLOG
/* Now we handle the fault proper. We only save DEAR in normal
* fault case since that's the only interesting values here.
* We could probably also optimize by not saving SRR0/1 in the
* linear mapping case but I'll leave that for later
*/
mfspr r14,SPRN_ESR
mfspr r16,SPRN_DEAR /* get faulting address */
srdi r11,r16,44 /* get region */
xoris r11,r11,0xc
cmpldi cr0,r11,0 /* linear mapping ? */
beq tlb_load_linear /* yes -> go to linear map load */
cmpldi cr1,r11,1 /* vmalloc mapping ? */
/* We do the user/kernel test for the PID here along with the RW test
*/
srdi. r11,r16,60 /* Check for user region */
ld r15,PACAPGD(r13) /* Load user pgdir */
beq htw_tlb_miss
/* XXX replace the RMW cycles with immediate loads + writes */
1: mfspr r10,SPRN_MAS1
rlwinm r10,r10,0,16,1 /* Clear TID */
mtspr SPRN_MAS1,r10
ld r15,PACA_KERNELPGD(r13) /* Load kernel pgdir */
beq+ cr1,htw_tlb_miss
/* We got a crappy address, just fault with whatever DEAR and ESR
* are here
*/
TLB_MISS_EPILOG_ERROR
b exc_data_storage_book3e
/* Instruction TLB miss */
START_EXCEPTION(instruction_tlb_miss_htw)
TLB_MISS_PROLOG
/* If we take a recursive fault, the second level handler may need
* to know whether we are handling a data or instruction fault in
* order to get to the right store fault handler. We provide that
* info by keeping a crazy value for ESR in r14
*/
li r14,-1 /* store to exception frame is done later */
/* Now we handle the fault proper. We only save DEAR in the non
* linear mapping case since we know the linear mapping case will
* not re-enter. We could indeed optimize and also not save SRR0/1
* in the linear mapping case but I'll leave that for later
*
* Faulting address is SRR0 which is already in r16
*/
srdi r11,r16,44 /* get region */
xoris r11,r11,0xc
cmpldi cr0,r11,0 /* linear mapping ? */
beq tlb_load_linear /* yes -> go to linear map load */
cmpldi cr1,r11,1 /* vmalloc mapping ? */
/* We do the user/kernel test for the PID here along with the RW test
*/
srdi. r11,r16,60 /* Check for user region */
ld r15,PACAPGD(r13) /* Load user pgdir */
beq htw_tlb_miss
/* XXX replace the RMW cycles with immediate loads + writes */
1: mfspr r10,SPRN_MAS1
rlwinm r10,r10,0,16,1 /* Clear TID */
mtspr SPRN_MAS1,r10
ld r15,PACA_KERNELPGD(r13) /* Load kernel pgdir */
beq+ htw_tlb_miss
/* We got a crappy address, just fault */
TLB_MISS_EPILOG_ERROR
b exc_instruction_storage_book3e
/*
* This is the guts of the second-level TLB miss handler for direct
* misses. We are entered with:
*
* r16 = virtual page table faulting address
* r15 = PGD pointer
* r14 = ESR
* r13 = PACA
* r12 = TLB exception frame in PACA
* r11 = crap (free to use)
* r10 = crap (free to use)
*
* It can be re-entered by the linear mapping miss handler. However, to
* avoid too much complication, it will save/restore things for us
*/
htw_tlb_miss:
#ifdef CONFIG_PPC_KUAP
mfspr r10,SPRN_MAS1
rlwinm. r10,r10,0,0x3fff0000
beq- htw_tlb_miss_fault /* KUAP fault */
#endif
/* Search if we already have a TLB entry for that virtual address, and
* if we do, bail out.
*
* MAS1:IND should be already set based on MAS4
*/
PPC_TLBSRX_DOT(0,R16)
beq htw_tlb_miss_done
/* Now, we need to walk the page tables. First check if we are in
* range.
*/
rldicl. r10,r16,64-PGTABLE_EADDR_SIZE,PGTABLE_EADDR_SIZE+4
bne- htw_tlb_miss_fault
/* Get the PGD pointer */
cmpldi cr0,r15,0
beq- htw_tlb_miss_fault
/* Get to PGD entry */
rldicl r11,r16,64-(PGDIR_SHIFT-3),64-PGD_INDEX_SIZE-3
clrrdi r10,r11,3
ldx r15,r10,r15
cmpdi cr0,r15,0
bge htw_tlb_miss_fault
/* Get to PUD entry */
rldicl r11,r16,64-(PUD_SHIFT-3),64-PUD_INDEX_SIZE-3
clrrdi r10,r11,3
ldx r15,r10,r15
cmpdi cr0,r15,0
bge htw_tlb_miss_fault
/* Get to PMD entry */
rldicl r11,r16,64-(PMD_SHIFT-3),64-PMD_INDEX_SIZE-3
clrrdi r10,r11,3
ldx r15,r10,r15
cmpdi cr0,r15,0
bge htw_tlb_miss_fault
/* Ok, we're all right, we can now create an indirect entry for
* a 1M or 256M page.
*
* The last trick is now that because we use "half" pages for
* the HTW (1M IND is 2K and 256M IND is 32K) we need to account
* for an added LSB bit to the RPN. For 64K pages, there is no
* problem as we already use 32K arrays (half PTE pages), but for
* 4K page we need to extract a bit from the virtual address and
* insert it into the "PA52" bit of the RPN.
*/
rlwimi r15,r16,32-9,20,20
/* Now we build the MAS:
*
* MAS 0 : Fully setup with defaults in MAS4 and TLBnCFG
* MAS 1 : Almost fully setup
* - PID already updated by caller if necessary
* - TSIZE for now is base ind page size always
* MAS 2 : Use defaults
* MAS 3+7 : Needs to be done
*/
ori r10,r15,(BOOK3E_PAGESZ_4K << MAS3_SPSIZE_SHIFT)
srdi r16,r10,32
mtspr SPRN_MAS3,r10
mtspr SPRN_MAS7,r16
tlbwe
htw_tlb_miss_done:
/* We don't bother with restoring DEAR or ESR since we know we are
* level 0 and just going back to userland. They are only needed
* if you are going to take an access fault
*/
TLB_MISS_EPILOG_SUCCESS
rfi
htw_tlb_miss_fault:
/* We need to check if it was an instruction miss. We know this
* though because r14 would contain -1
*/
cmpdi cr0,r14,-1
beq 1f
mtspr SPRN_DEAR,r16
mtspr SPRN_ESR,r14
TLB_MISS_EPILOG_ERROR
b exc_data_storage_book3e
1: TLB_MISS_EPILOG_ERROR
b exc_instruction_storage_book3e
/*
* This is the guts of "any" level TLB miss handler for kernel linear
* mapping misses. We are entered with:

94
arch/powerpc/mm/pgtable.c
View File

@ -297,11 +297,8 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
}
#if defined(CONFIG_PPC_8xx)
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
pte_t pte, unsigned long sz)
static void __set_huge_pte_at(pmd_t *pmd, pte_t *ptep, pte_basic_t val)
{
pmd_t *pmd = pmd_off(mm, addr);
pte_basic_t val;
pte_basic_t *entry = (pte_basic_t *)ptep;
int num, i;
@ -311,15 +308,60 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
*/
VM_WARN_ON(pte_hw_valid(*ptep) && !pte_protnone(*ptep));
pte = set_pte_filter(pte, addr);
val = pte_val(pte);
num = number_of_cells_per_pte(pmd, val, 1);
for (i = 0; i < num; i++, entry++, val += SZ_4K)
*entry = val;
}
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
pte_t pte, unsigned long sz)
{
pmd_t *pmdp = pmd_off(mm, addr);
pte = set_pte_filter(pte, addr);
if (sz == SZ_8M) { /* Flag both PMD entries as 8M and fill both page tables */
*pmdp = __pmd(pmd_val(*pmdp) | _PMD_PAGE_8M);
*(pmdp + 1) = __pmd(pmd_val(*(pmdp + 1)) | _PMD_PAGE_8M);
__set_huge_pte_at(pmdp, pte_offset_kernel(pmdp, 0), pte_val(pte));
__set_huge_pte_at(pmdp, pte_offset_kernel(pmdp + 1, 0), pte_val(pte) + SZ_4M);
} else {
__set_huge_pte_at(pmdp, ptep, pte_val(pte));
}
}
#else
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
pte_t pte, unsigned long sz)
{
unsigned long pdsize;
int i;
pte = set_pte_filter(pte, addr);
/*
* Make sure hardware valid bit is not set. We don't do
* tlb flush for this update.
*/
VM_WARN_ON(pte_hw_valid(*ptep) && !pte_protnone(*ptep));
if (sz < PMD_SIZE)
pdsize = PAGE_SIZE;
else if (sz < PUD_SIZE)
pdsize = PMD_SIZE;
else if (sz < P4D_SIZE)
pdsize = PUD_SIZE;
else if (sz < PGDIR_SIZE)
pdsize = P4D_SIZE;
else
pdsize = PGDIR_SIZE;
for (i = 0; i < sz / pdsize; i++, ptep++, addr += pdsize) {
__set_pte_at(mm, addr, ptep, pte, 0);
pte = __pte(pte_val(pte) + ((unsigned long long)pdsize / PAGE_SIZE << PFN_PTE_SHIFT));
}
}
#endif
#endif /* CONFIG_HUGETLB_PAGE */
@ -367,11 +409,10 @@ unsigned long vmalloc_to_phys(void *va)
EXPORT_SYMBOL_GPL(vmalloc_to_phys);
/*
* We have 4 cases for pgds and pmds:
* We have 3 cases for pgds and pmds:
* (1) invalid (all zeroes)
* (2) pointer to next table, as normal; bottom 6 bits == 0
* (3) leaf pte for huge page _PAGE_PTE set
* (4) hugepd pointer, _PAGE_PTE = 0 and bits [2..6] indicate size of table
*
* So long as we atomically load page table pointers we are safe against teardown,
* we can follow the address down to the page and take a ref on it.
@ -382,11 +423,12 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hpage_shift)
{
pgd_t *pgdp;
#ifdef CONFIG_PPC64
p4d_t p4d, *p4dp;
pud_t pud, *pudp;
#endif
pmd_t pmd, *pmdp;
pte_t *ret_pte;
hugepd_t *hpdp = NULL;
unsigned pdshift;
if (hpage_shift)
@ -401,8 +443,12 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
* page fault or a page unmap. The return pte_t * is still not
* stable. So should be checked there for above conditions.
* Top level is an exception because it is folded into p4d.
*
* On PPC32, P4D/PUD/PMD are folded into PGD so go straight to
* PMD level.
*/
pgdp = pgdir + pgd_index(ea);
#ifdef CONFIG_PPC64
p4dp = p4d_offset(pgdp, ea);
p4d = READ_ONCE(*p4dp);
pdshift = P4D_SHIFT;
@ -415,11 +461,6 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
goto out;
}
if (is_hugepd(__hugepd(p4d_val(p4d)))) {
hpdp = (hugepd_t *)&p4d;
goto out_huge;
}
/*
* Even if we end up with an unmap, the pgtable will not
* be freed, because we do an rcu free and here we are
@ -437,13 +478,11 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
goto out;
}
if (is_hugepd(__hugepd(pud_val(pud)))) {
hpdp = (hugepd_t *)&pud;
goto out_huge;
}
pdshift = PMD_SHIFT;
pmdp = pmd_offset(&pud, ea);
#else
pmdp = pmd_offset(pud_offset(p4d_offset(pgdp, ea), ea), ea);
#endif
pdshift = PMD_SHIFT;
pmd = READ_ONCE(*pmdp);
/*
@ -476,19 +515,8 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
goto out;
}
if (is_hugepd(__hugepd(pmd_val(pmd)))) {
hpdp = (hugepd_t *)&pmd;
goto out_huge;
}
return pte_offset_kernel(&pmd, ea);
out_huge:
if (!hpdp)
return NULL;
ret_pte = hugepte_offset(*hpdp, ea, pdshift);
pdshift = hugepd_shift(*hpdp);
out:
if (hpage_shift)
*hpage_shift = pdshift;

2
arch/powerpc/mm/pgtable_32.c
View File

@ -48,7 +48,7 @@ notrace void __init early_ioremap_init(void)
early_ioremap_setup();
}
static void __init *early_alloc_pgtable(unsigned long size)
void __init *early_alloc_pgtable(unsigned long size)
{
void *ptr = memblock_alloc(size, size);

2
arch/riscv/include/asm/hugetlb.h
View File

@ -44,7 +44,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
pte_t pte, int dirty);
#define __HAVE_ARCH_HUGE_PTEP_GET
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
#define arch_make_huge_pte arch_make_huge_pte

4
arch/riscv/include/asm/pgtable.h
View File

@ -514,8 +514,8 @@ static inline void update_mmu_cache_range(struct vm_fault *vmf,
#define update_mmu_cache(vma, addr, ptep) \
update_mmu_cache_range(NULL, vma, addr, ptep, 1)
#define __HAVE_ARCH_UPDATE_MMU_TLB
#define update_mmu_tlb update_mmu_cache
#define update_mmu_tlb_range(vma, addr, ptep, nr) \
update_mmu_cache_range(NULL, vma, addr, ptep, nr)
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)

2
arch/riscv/mm/hugetlbpage.c
View File

@ -3,7 +3,7 @@
#include <linux/err.h>
#ifdef CONFIG_RISCV_ISA_SVNAPOT
pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
unsigned long pte_num;
int i;

1
arch/s390/Kconfig
View File

@ -159,6 +159,7 @@ config S390
select HAVE_ARCH_KASAN
select HAVE_ARCH_KASAN_VMALLOC
select HAVE_ARCH_KCSAN
select HAVE_ARCH_KMSAN
select HAVE_ARCH_KFENCE
select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
select HAVE_ARCH_SECCOMP_FILTER

2
arch/s390/Makefile
View File

@ -36,7 +36,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option
KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
UTS_MACHINE := s390x
STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
STACK_SIZE := $(if $(CONFIG_KASAN),65536,$(if $(CONFIG_KMSAN),65536,16384))
CHECKFLAGS += -D__s390__ -D__s390x__
export LD_BFD

3
arch/s390/boot/Makefile
View File

@ -3,11 +3,13 @@
# Makefile for the linux s390-specific parts of the memory manager.
#
# Tooling runtimes are unavailable and cannot be linked for early boot code
KCOV_INSTRUMENT := n
GCOV_PROFILE := n
UBSAN_SANITIZE := n
KASAN_SANITIZE := n
KCSAN_SANITIZE := n
KMSAN_SANITIZE := n
KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
@ -42,6 +44,7 @@ obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE)) +=
obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
obj-y += $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) info.o
obj-$(CONFIG_KERNEL_ZSTD) += clz_ctz.o
obj-$(CONFIG_KMSAN) += kmsan.o
obj-all := $(obj-y) piggy.o syms.o
targets := bzImage section_cmp.boot.data section_cmp.boot.preserved.data $(obj-y)

6
arch/s390/boot/kmsan.c Normal file
View File

@ -0,0 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/kmsan-checks.h>
void kmsan_unpoison_memory(const void *address, size_t size)
{
}

7
arch/s390/boot/startup.c
View File

@ -304,11 +304,18 @@ static unsigned long setup_kernel_memory_layout(unsigned long kernel_size)
MODULES_END = round_down(kernel_start, _SEGMENT_SIZE);
MODULES_VADDR = MODULES_END - MODULES_LEN;
VMALLOC_END = MODULES_VADDR;
if (IS_ENABLED(CONFIG_KMSAN))
VMALLOC_END -= MODULES_LEN * 2;
/* allow vmalloc area to occupy up to about 1/2 of the rest virtual space left */
vsize = (VMALLOC_END - FIXMAP_SIZE) / 2;
vsize = round_down(vsize, _SEGMENT_SIZE);
vmalloc_size = min(vmalloc_size, vsize);
if (IS_ENABLED(CONFIG_KMSAN)) {
/* take 2/3 of vmalloc area for KMSAN shadow and origins */
vmalloc_size = round_down(vmalloc_size / 3, _SEGMENT_SIZE);
VMALLOC_END -= vmalloc_size * 2;
}
VMALLOC_START = VMALLOC_END - vmalloc_size;
__memcpy_real_area = round_down(VMALLOC_START - MEMCPY_REAL_SIZE, PAGE_SIZE);

16
arch/s390/boot/string.c
View File

@ -1,11 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
#define IN_BOOT_STRING_C 1
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#undef CONFIG_KASAN
#undef CONFIG_KASAN_GENERIC
#undef CONFIG_KMSAN
#include "../lib/string.c"
/*
* Duplicate some functions from the common lib/string.c
* instead of fully including it.
*/
int strncmp(const char *cs, const char *ct, size_t count)
{
unsigned char c1, c2;
@ -22,6 +29,15 @@ int strncmp(const char *cs, const char *ct, size_t count)
return 0;
}
void *memset64(uint64_t *s, uint64_t v, size_t count)
{
uint64_t *xs = s;
while (count--)
*xs++ = v;
return s;
}
char *skip_spaces(const char *str)
{
while (isspace(*str))

2
arch/s390/include/asm/checksum.h
View File

@ -13,6 +13,7 @@
#define _S390_CHECKSUM_H
#include <linux/instrumented.h>
#include <linux/kmsan-checks.h>
#include <linux/in6.h>
static inline __wsum cksm(const void *buff, int len, __wsum sum)
@ -23,6 +24,7 @@ static inline __wsum cksm(const void *buff, int len, __wsum sum)
};
instrument_read(buff, len);
kmsan_check_memory(buff, len);
asm volatile("\n"
"0: cksm %[sum],%[rp]\n"
" jo 0b\n"

3
arch/s390/include/asm/cpacf.h
View File

@ -12,6 +12,7 @@
#define _ASM_S390_CPACF_H
#include <asm/facility.h>
#include <linux/kmsan-checks.h>
/*
* Instruction opcodes for the CPACF instructions
@ -542,6 +543,8 @@ static inline void cpacf_trng(u8 *ucbuf, unsigned long ucbuf_len,
: [ucbuf] "+&d" (u.pair), [cbuf] "+&d" (c.pair)
: [fc] "K" (CPACF_PRNO_TRNG), [opc] "i" (CPACF_PRNO)
: "cc", "memory", "0");
kmsan_unpoison_memory(ucbuf, ucbuf_len);
kmsan_unpoison_memory(cbuf, cbuf_len);
}
/**

6
arch/s390/include/asm/cpu_mf.h
View File

@ -10,6 +10,7 @@
#define _ASM_S390_CPU_MF_H
#include <linux/errno.h>
#include <linux/kmsan-checks.h>
#include <asm/asm-extable.h>
#include <asm/facility.h>
@ -239,6 +240,11 @@ static __always_inline int stcctm(enum stcctm_ctr_set set, u64 range, u64 *dest)
: "=d" (cc)
: "Q" (*dest), "d" (range), "i" (set)
: "cc", "memory");
/*
* If cc == 2, less than RANGE counters are stored, but it's not easy
* to tell how many. Always unpoison the whole range for simplicity.
*/
kmsan_unpoison_memory(dest, range * sizeof(u64));
return cc;
}

4
arch/s390/include/asm/hugetlb.h
View File

@ -19,7 +19,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte, unsigned long sz);
void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
pte_t huge_ptep_get(pte_t *ptep);
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep);
@ -64,7 +64,7 @@ static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty)
{
int changed = !pte_same(huge_ptep_get(ptep), pte);
int changed = !pte_same(huge_ptep_get(vma->vm_mm, addr, ptep), pte);
if (changed) {
huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
__set_huge_pte_at(vma->vm_mm, addr, ptep, pte);

17
arch/s390/include/asm/irqflags.h
View File

@ -37,12 +37,18 @@ static __always_inline void __arch_local_irq_ssm(unsigned long flags)
asm volatile("ssm %0" : : "Q" (flags) : "memory");
}
static __always_inline unsigned long arch_local_save_flags(void)
#ifdef CONFIG_KMSAN
#define arch_local_irq_attributes noinline notrace __no_sanitize_memory __maybe_unused
#else
#define arch_local_irq_attributes __always_inline
#endif
static arch_local_irq_attributes unsigned long arch_local_save_flags(void)
{
return __arch_local_irq_stnsm(0xff);
}
static __always_inline unsigned long arch_local_irq_save(void)
static arch_local_irq_attributes unsigned long arch_local_irq_save(void)
{
return __arch_local_irq_stnsm(0xfc);
}
@ -52,7 +58,12 @@ static __always_inline void arch_local_irq_disable(void)
arch_local_irq_save();
}
static __always_inline void arch_local_irq_enable(void)
static arch_local_irq_attributes void arch_local_irq_enable_external(void)
{
__arch_local_irq_stosm(0x01);
}
static arch_local_irq_attributes void arch_local_irq_enable(void)
{
__arch_local_irq_stosm(0x03);
}

59
arch/s390/include/asm/kmsan.h Normal file
View File

@ -0,0 +1,59 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_KMSAN_H
#define _ASM_S390_KMSAN_H
#include <asm/lowcore.h>
#include <asm/page.h>
#include <linux/kmsan.h>
#include <linux/mmzone.h>
#include <linux/stddef.h>
#ifndef MODULE
static inline bool is_lowcore_addr(void *addr)
{
return addr >= (void *)&S390_lowcore &&
addr < (void *)(&S390_lowcore + 1);
}
static inline void *arch_kmsan_get_meta_or_null(void *addr, bool is_origin)
{
if (is_lowcore_addr(addr)) {
/*
* Different lowcores accessed via S390_lowcore are described
* by the same struct page. Resolve the prefix manually in
* order to get a distinct struct page.
*/
addr += (void *)lowcore_ptr[raw_smp_processor_id()] -
(void *)&S390_lowcore;
if (KMSAN_WARN_ON(is_lowcore_addr(addr)))
return NULL;
return kmsan_get_metadata(addr, is_origin);
}
return NULL;
}
static inline bool kmsan_virt_addr_valid(void *addr)
{
bool ret;
/*
* pfn_valid() relies on RCU, and may call into the scheduler on exiting
* the critical section. However, this would result in recursion with
* KMSAN. Therefore, disable preemption here, and re-enable preemption
* below while suppressing reschedules to avoid recursion.
*
* Note, this sacrifices occasionally breaking scheduling guarantees.
* Although, a kernel compiled with KMSAN has already given up on any
* performance guarantees due to being heavily instrumented.
*/
preempt_disable();
ret = virt_addr_valid(addr);
preempt_enable_no_resched();
return ret;
}
#endif /* !MODULE */
#endif /* _ASM_S390_KMSAN_H */

12
arch/s390/include/asm/pgtable.h
View File

@ -107,6 +107,18 @@ static inline int is_module_addr(void *addr)
return 1;
}
#ifdef CONFIG_KMSAN
#define KMSAN_VMALLOC_SIZE (VMALLOC_END - VMALLOC_START)
#define KMSAN_VMALLOC_SHADOW_START VMALLOC_END
#define KMSAN_VMALLOC_SHADOW_END (KMSAN_VMALLOC_SHADOW_START + KMSAN_VMALLOC_SIZE)
#define KMSAN_VMALLOC_ORIGIN_START KMSAN_VMALLOC_SHADOW_END
#define KMSAN_VMALLOC_ORIGIN_END (KMSAN_VMALLOC_ORIGIN_START + KMSAN_VMALLOC_SIZE)
#define KMSAN_MODULES_SHADOW_START KMSAN_VMALLOC_ORIGIN_END
#define KMSAN_MODULES_SHADOW_END (KMSAN_MODULES_SHADOW_START + MODULES_LEN)
#define KMSAN_MODULES_ORIGIN_START KMSAN_MODULES_SHADOW_END
#define KMSAN_MODULES_ORIGIN_END (KMSAN_MODULES_ORIGIN_START + MODULES_LEN)
#endif
#ifdef CONFIG_RANDOMIZE_BASE
#define KASLR_LEN (1UL << 31)
#else

20
arch/s390/include/asm/string.h
View File

@ -15,15 +15,12 @@
#define __HAVE_ARCH_MEMCPY /* gcc builtin & arch function */
#define __HAVE_ARCH_MEMMOVE /* gcc builtin & arch function */
#define __HAVE_ARCH_MEMSET /* gcc builtin & arch function */
#define __HAVE_ARCH_MEMSET16 /* arch function */
#define __HAVE_ARCH_MEMSET32 /* arch function */
#define __HAVE_ARCH_MEMSET64 /* arch function */
void *memcpy(void *dest, const void *src, size_t n);
void *memset(void *s, int c, size_t n);
void *memmove(void *dest, const void *src, size_t n);
#ifndef CONFIG_KASAN
#if !defined(CONFIG_KASAN) && !defined(CONFIG_KMSAN)
#define __HAVE_ARCH_MEMCHR /* inline & arch function */
#define __HAVE_ARCH_MEMCMP /* arch function */
#define __HAVE_ARCH_MEMSCAN /* inline & arch function */
@ -36,6 +33,9 @@ void *memmove(void *dest, const void *src, size_t n);
#define __HAVE_ARCH_STRNCPY /* arch function */
#define __HAVE_ARCH_STRNLEN /* inline & arch function */
#define __HAVE_ARCH_STRSTR /* arch function */
#define __HAVE_ARCH_MEMSET16 /* arch function */
#define __HAVE_ARCH_MEMSET32 /* arch function */
#define __HAVE_ARCH_MEMSET64 /* arch function */
/* Prototypes for non-inlined arch strings functions. */
int memcmp(const void *s1, const void *s2, size_t n);
@ -44,7 +44,7 @@ size_t strlcat(char *dest, const char *src, size_t n);
char *strncat(char *dest, const char *src, size_t n);
char *strncpy(char *dest, const char *src, size_t n);
char *strstr(const char *s1, const char *s2);
#endif /* !CONFIG_KASAN */
#endif /* !defined(CONFIG_KASAN) && !defined(CONFIG_KMSAN) */
#undef __HAVE_ARCH_STRCHR
#undef __HAVE_ARCH_STRNCHR
@ -74,20 +74,30 @@ void *__memset16(uint16_t *s, uint16_t v, size_t count);
void *__memset32(uint32_t *s, uint32_t v, size_t count);
void *__memset64(uint64_t *s, uint64_t v, size_t count);
#ifdef __HAVE_ARCH_MEMSET16
static inline void *memset16(uint16_t *s, uint16_t v, size_t count)
{
return __memset16(s, v, count * sizeof(v));
}
#endif
#ifdef __HAVE_ARCH_MEMSET32
static inline void *memset32(uint32_t *s, uint32_t v, size_t count)
{
return __memset32(s, v, count * sizeof(v));
}
#endif
#ifdef __HAVE_ARCH_MEMSET64
#ifdef IN_BOOT_STRING_C
void *memset64(uint64_t *s, uint64_t v, size_t count);
#else
static inline void *memset64(uint64_t *s, uint64_t v, size_t count)
{
return __memset64(s, v, count * sizeof(v));
}
#endif
#endif
#if !defined(IN_ARCH_STRING_C) && (!defined(CONFIG_FORTIFY_SOURCE) || defined(__NO_FORTIFY))

2
arch/s390/include/asm/thread_info.h
View File

@ -16,7 +16,7 @@
/*
* General size of kernel stacks
*/
#ifdef CONFIG_KASAN
#if defined(CONFIG_KASAN) || defined(CONFIG_KMSAN)
#define THREAD_SIZE_ORDER 4
#else
#define THREAD_SIZE_ORDER 2

88
arch/s390/include/asm/uaccess.h
View File

@ -18,6 +18,7 @@
#include <asm/extable.h>
#include <asm/facility.h>
#include <asm-generic/access_ok.h>
#include <linux/instrumented.h>
void debug_user_asce(int exit);
@ -78,13 +79,24 @@ union oac {
int __noreturn __put_user_bad(void);
#define __put_user_asm(to, from, size) \
({ \
#ifdef CONFIG_KMSAN
#define get_put_user_noinstr_attributes \
noinline __maybe_unused __no_sanitize_memory
#else
#define get_put_user_noinstr_attributes __always_inline
#endif
#define DEFINE_PUT_USER(type) \
static get_put_user_noinstr_attributes int \
__put_user_##type##_noinstr(unsigned type __user *to, \
unsigned type *from, \
unsigned long size) \
{ \
union oac __oac_spec = { \
.oac1.as = PSW_BITS_AS_SECONDARY, \
.oac1.a = 1, \
}; \
int __rc; \
int rc; \
\
asm volatile( \
" lr 0,%[spec]\n" \
@ -93,12 +105,28 @@ int __noreturn __put_user_bad(void);
"2:\n" \
EX_TABLE_UA_STORE(0b, 2b, %[rc]) \
EX_TABLE_UA_STORE(1b, 2b, %[rc]) \
: [rc] "=&d" (__rc), [_to] "+Q" (*(to)) \
: [rc] "=&d" (rc), [_to] "+Q" (*(to)) \
: [_size] "d" (size), [_from] "Q" (*(from)), \
[spec] "d" (__oac_spec.val) \
: "cc", "0"); \
__rc; \
})
return rc; \
} \
\
static __always_inline int \
__put_user_##type(unsigned type __user *to, unsigned type *from, \
unsigned long size) \
{ \
int rc; \
\
rc = __put_user_##type##_noinstr(to, from, size); \
instrument_put_user(*from, to, size); \
return rc; \
}
DEFINE_PUT_USER(char);
DEFINE_PUT_USER(short);
DEFINE_PUT_USER(int);
DEFINE_PUT_USER(long);
static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
@ -106,22 +134,22 @@ static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned lon
switch (size) {
case 1:
rc = __put_user_asm((unsigned char __user *)ptr,
rc = __put_user_char((unsigned char __user *)ptr,
(unsigned char *)x,
size);
break;
case 2:
rc = __put_user_asm((unsigned short __user *)ptr,
rc = __put_user_short((unsigned short __user *)ptr,
(unsigned short *)x,
size);
break;
case 4:
rc = __put_user_asm((unsigned int __user *)ptr,
rc = __put_user_int((unsigned int __user *)ptr,
(unsigned int *)x,
size);
break;
case 8:
rc = __put_user_asm((unsigned long __user *)ptr,
rc = __put_user_long((unsigned long __user *)ptr,
(unsigned long *)x,
size);
break;
@ -134,13 +162,17 @@ static __always_inline int __put_user_fn(void *x, void __user *ptr, unsigned lon
int __noreturn __get_user_bad(void);
#define __get_user_asm(to, from, size) \
({ \
#define DEFINE_GET_USER(type) \
static get_put_user_noinstr_attributes int \
__get_user_##type##_noinstr(unsigned type *to, \
unsigned type __user *from, \
unsigned long size) \
{ \
union oac __oac_spec = { \
.oac2.as = PSW_BITS_AS_SECONDARY, \
.oac2.a = 1, \
}; \
int __rc; \
int rc; \
\
asm volatile( \
" lr 0,%[spec]\n" \
@ -149,13 +181,29 @@ int __noreturn __get_user_bad(void);
"2:\n" \
EX_TABLE_UA_LOAD_MEM(0b, 2b, %[rc], %[_to], %[_ksize]) \
EX_TABLE_UA_LOAD_MEM(1b, 2b, %[rc], %[_to], %[_ksize]) \
: [rc] "=&d" (__rc), "=Q" (*(to)) \
: [rc] "=&d" (rc), "=Q" (*(to)) \
: [_size] "d" (size), [_from] "Q" (*(from)), \
[spec] "d" (__oac_spec.val), [_to] "a" (to), \
[_ksize] "K" (size) \
: "cc", "0"); \
__rc; \
})
return rc; \
} \
\
static __always_inline int \
__get_user_##type(unsigned type *to, unsigned type __user *from, \
unsigned long size) \
{ \
int rc; \
\
rc = __get_user_##type##_noinstr(to, from, size); \
instrument_get_user(*to); \
return rc; \
}
DEFINE_GET_USER(char);
DEFINE_GET_USER(short);
DEFINE_GET_USER(int);
DEFINE_GET_USER(long);
static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
@ -163,22 +211,22 @@ static __always_inline int __get_user_fn(void *x, const void __user *ptr, unsign
switch (size) {
case 1:
rc = __get_user_asm((unsigned char *)x,
rc = __get_user_char((unsigned char *)x,
(unsigned char __user *)ptr,
size);
break;
case 2:
rc = __get_user_asm((unsigned short *)x,
rc = __get_user_short((unsigned short *)x,
(unsigned short __user *)ptr,
size);
break;
case 4:
rc = __get_user_asm((unsigned int *)x,
rc = __get_user_int((unsigned int *)x,
(unsigned int __user *)ptr,
size);
break;
case 8:
rc = __get_user_asm((unsigned long *)x,
rc = __get_user_long((unsigned long *)x,
(unsigned long __user *)ptr,
size);
break;

10
arch/s390/kernel/diag.c
View File

@ -282,12 +282,14 @@ int diag224(void *ptr)
int rc = -EOPNOTSUPP;
diag_stat_inc(DIAG_STAT_X224);
asm volatile(
" diag %1,%2,0x224\n"
"0: lhi %0,0x0\n"
asm volatile("\n"
" diag %[type],%[addr],0x224\n"
"0: lhi %[rc],0\n"
"1:\n"
EX_TABLE(0b,1b)
: "+d" (rc) :"d" (0), "d" (addr) : "memory");
: [rc] "+d" (rc)
, "=m" (*(struct { char buf[PAGE_SIZE]; } *)ptr)
: [type] "d" (0), [addr] "d" (addr));
return rc;
}
EXPORT_SYMBOL(diag224);

2
arch/s390/kernel/ftrace.c
View File

@ -12,6 +12,7 @@
#include <linux/ftrace.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/kmsan-checks.h>
#include <linux/kprobes.h>
#include <linux/execmem.h>
#include <trace/syscall.h>
@ -303,6 +304,7 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
if (bit < 0)
return;
kmsan_unpoison_memory(fregs, sizeof(*fregs));
regs = ftrace_get_regs(fregs);
p = get_kprobe((kprobe_opcode_t *)ip);
if (!regs || unlikely(!p) || kprobe_disabled(p))

6
arch/s390/kernel/traps.c
View File

@ -27,6 +27,7 @@
#include <linux/uaccess.h>
#include <linux/cpu.h>
#include <linux/entry-common.h>
#include <linux/kmsan.h>
#include <asm/asm-extable.h>
#include <asm/vtime.h>
#include <asm/fpu.h>
@ -262,6 +263,11 @@ static void monitor_event_exception(struct pt_regs *regs)
void kernel_stack_overflow(struct pt_regs *regs)
{
/*
* Normally regs are unpoisoned by the generic entry code, but
* kernel_stack_overflow() is a rare case that is called bypassing it.
*/
kmsan_unpoison_entry_regs(regs);
bust_spinlocks(1);
printk("Kernel stack overflow.\n");
show_regs(regs);

4
arch/s390/kernel/unwind_bc.c
View File

@ -49,6 +49,8 @@ static inline bool is_final_pt_regs(struct unwind_state *state,
READ_ONCE_NOCHECK(regs->psw.mask) & PSW_MASK_PSTATE;
}
/* Avoid KMSAN false positives from touching uninitialized frames. */
__no_kmsan_checks
bool unwind_next_frame(struct unwind_state *state)
{
struct stack_info *info = &state->stack_info;
@ -118,6 +120,8 @@ out_stop:
}
EXPORT_SYMBOL_GPL(unwind_next_frame);
/* Avoid KMSAN false positives from touching uninitialized frames. */
__no_kmsan_checks
void __unwind_start(struct unwind_state *state, struct task_struct *task,
struct pt_regs *regs, unsigned long first_frame)
{

4
arch/s390/mm/hugetlbpage.c
View File

@ -169,7 +169,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
__set_huge_pte_at(mm, addr, ptep, pte);
}
pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
return __rste_to_pte(pte_val(*ptep));
}
@ -177,7 +177,7 @@ pte_t huge_ptep_get(pte_t *ptep)
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
pte_t pte = huge_ptep_get(ptep);
pte_t pte = huge_ptep_get(mm, addr, ptep);
pmd_t *pmdp = (pmd_t *) ptep;
pud_t *pudp = (pud_t *) ptep;

2
arch/sparc/mm/init_64.c
View File

@ -490,7 +490,7 @@ void flush_dcache_folio(struct folio *folio)
}
set_dcache_dirty(folio, this_cpu);
} else {
/* We could delay the flush for the !page_mapping
/* We could delay the flush for the !folio_mapping
* case too. But that case is for exec env/arg
* pages and those are %99 certainly going to get
* faulted into the tlb (and thus flushed) anyways.

14
arch/x86/mm/init_64.c
View File

@ -988,8 +988,6 @@ static void __meminit free_pagetable(struct page *page, int order)
/* bootmem page has reserved flag */
if (PageReserved(page)) {
__ClearPageReserved(page);
magic = page->index;
if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
while (nr_pages--)
@ -1362,18 +1360,6 @@ void __init mem_init(void)
preallocate_vmalloc_pages();
}
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask)
{
/*
* More CPUs always led to greater speedups on tested systems, up to
* all the nodes' CPUs. Use all since the system is otherwise idle
* now.
*/
return max_t(int, cpumask_weight(node_cpumask), 1);
}
#endif
int kernel_set_to_readonly;
void mark_rodata_ro(void)

4
arch/x86/mm/pat/set_memory.c
View File

@ -1119,8 +1119,8 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
lpinc = PMD_SIZE;
/*
* Clear the PSE flags if the PRESENT flag is not set
* otherwise pmd_present/pmd_huge will return true
* even on a non present pmd.
* otherwise pmd_present() will return true even on a non
* present pmd.
*/
if (!(pgprot_val(ref_prot) & _PAGE_PRESENT))
pgprot_val(ref_prot) &= ~_PAGE_PSE;

6
arch/xtensa/include/asm/pgtable.h
View File

@ -410,9 +410,9 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
typedef pte_t *pte_addr_t;
void update_mmu_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep);
#define __HAVE_ARCH_UPDATE_MMU_TLB
void update_mmu_tlb_range(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep, unsigned int nr);
#define update_mmu_tlb_range update_mmu_tlb_range
#endif /* !defined (__ASSEMBLY__) */

6
arch/xtensa/mm/tlb.c
View File

@ -163,10 +163,10 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
}
}
void update_mmu_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
void update_mmu_tlb_range(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep, unsigned int nr)
{
local_flush_tlb_page(vma, address);
local_flush_tlb_range(vma, address, address + PAGE_SIZE * nr);
}
#ifdef CONFIG_DEBUG_TLB_SANITY

7
drivers/acpi/numa/hmat.c
View File

@ -933,17 +933,14 @@ static int hmat_callback(struct notifier_block *self,
return NOTIFY_OK;
}
static int hmat_set_default_dram_perf(void)
static int __init hmat_set_default_dram_perf(void)
{
int rc;
int nid, pxm;
struct memory_target *target;
struct access_coordinate *attrs;
if (!default_dram_type)
return -EIO;
for_each_node_mask(nid, default_dram_type->nodes) {
for_each_node_mask(nid, default_dram_nodes) {
pxm = node_to_pxm(nid);
target = find_mem_target(pxm);
if (!target)

1
drivers/block/zram/Kconfig
View File

@ -2,6 +2,7 @@
config ZRAM
tristate "Compressed RAM block device support"
depends on BLOCK && SYSFS && MMU
depends on HAVE_ZSMALLOC
depends on CRYPTO_LZO || CRYPTO_ZSTD || CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_842
select ZSMALLOC
help

1
drivers/dma-buf/Kconfig
View File

@ -35,6 +35,7 @@ config UDMABUF
default n
depends on DMA_SHARED_BUFFER
depends on MEMFD_CREATE || COMPILE_TEST
depends on MMU
help
A driver to let userspace turn memfd regions into dma-bufs.
Qemu can use this to create host dmabufs for guest framebuffers.

232
drivers/dma-buf/udmabuf.c
View File

@ -10,6 +10,7 @@
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/shmem_fs.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/udmabuf.h>
#include <linux/vmalloc.h>
@ -25,9 +26,16 @@ MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is
struct udmabuf {
pgoff_t pagecount;
struct page **pages;
struct folio **folios;
struct sg_table *sg;
struct miscdevice *device;
pgoff_t *offsets;
struct list_head unpin_list;
};
struct udmabuf_folio {
struct folio *folio;
struct list_head list;
};
static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf)
@ -35,12 +43,15 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf)
struct vm_area_struct *vma = vmf->vma;
struct udmabuf *ubuf = vma->vm_private_data;
pgoff_t pgoff = vmf->pgoff;
unsigned long pfn;
if (pgoff >= ubuf->pagecount)
return VM_FAULT_SIGBUS;
vmf->page = ubuf->pages[pgoff];
get_page(vmf->page);
return 0;
pfn = folio_pfn(ubuf->folios[pgoff]);
pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT;
return vmf_insert_pfn(vma, vmf->address, pfn);
}
static const struct vm_operations_struct udmabuf_vm_ops = {
@ -56,17 +67,28 @@ static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
vma->vm_ops = &udmabuf_vm_ops;
vma->vm_private_data = ubuf;
vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
return 0;
}
static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map)
{
struct udmabuf *ubuf = buf->priv;
struct page **pages;
void *vaddr;
pgoff_t pg;
dma_resv_assert_held(buf->resv);
vaddr = vm_map_ram(ubuf->pages, ubuf->pagecount, -1);
pages = kmalloc_array(ubuf->pagecount, sizeof(*pages), GFP_KERNEL);
if (!pages)
return -ENOMEM;
for (pg = 0; pg < ubuf->pagecount; pg++)
pages[pg] = &ubuf->folios[pg]->page;
vaddr = vm_map_ram(pages, ubuf->pagecount, -1);
kfree(pages);
if (!vaddr)
return -EINVAL;
@ -88,23 +110,30 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf,
{
struct udmabuf *ubuf = buf->priv;
struct sg_table *sg;
struct scatterlist *sgl;
unsigned int i = 0;
int ret;
sg = kzalloc(sizeof(*sg), GFP_KERNEL);
if (!sg)
return ERR_PTR(-ENOMEM);
ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->pagecount,
0, ubuf->pagecount << PAGE_SHIFT,
GFP_KERNEL);
ret = sg_alloc_table(sg, ubuf->pagecount, GFP_KERNEL);
if (ret < 0)
goto err;
goto err_alloc;
for_each_sg(sg->sgl, sgl, ubuf->pagecount, i)
sg_set_folio(sgl, ubuf->folios[i], PAGE_SIZE,
ubuf->offsets[i]);
ret = dma_map_sgtable(dev, sg, direction, 0);
if (ret < 0)
goto err;
goto err_map;
return sg;
err:
err_map:
sg_free_table(sg);
err_alloc:
kfree(sg);
return ERR_PTR(ret);
}
@ -130,18 +159,45 @@ static void unmap_udmabuf(struct dma_buf_attachment *at,
return put_sg_table(at->dev, sg, direction);
}
static void unpin_all_folios(struct list_head *unpin_list)
{
struct udmabuf_folio *ubuf_folio;
while (!list_empty(unpin_list)) {
ubuf_folio = list_first_entry(unpin_list,
struct udmabuf_folio, list);
unpin_folio(ubuf_folio->folio);
list_del(&ubuf_folio->list);
kfree(ubuf_folio);
}
}
static int add_to_unpin_list(struct list_head *unpin_list,
struct folio *folio)
{
struct udmabuf_folio *ubuf_folio;
ubuf_folio = kzalloc(sizeof(*ubuf_folio), GFP_KERNEL);
if (!ubuf_folio)
return -ENOMEM;
ubuf_folio->folio = folio;
list_add_tail(&ubuf_folio->list, unpin_list);
return 0;
}
static void release_udmabuf(struct dma_buf *buf)
{
struct udmabuf *ubuf = buf->priv;
struct device *dev = ubuf->device->this_device;
pgoff_t pg;
if (ubuf->sg)
put_sg_table(dev, ubuf->sg, DMA_BIDIRECTIONAL);
for (pg = 0; pg < ubuf->pagecount; pg++)
put_page(ubuf->pages[pg]);
kfree(ubuf->pages);
unpin_all_folios(&ubuf->unpin_list);
kfree(ubuf->offsets);
kfree(ubuf->folios);
kfree(ubuf);
}
@ -194,24 +250,64 @@ static const struct dma_buf_ops udmabuf_ops = {
#define SEALS_WANTED (F_SEAL_SHRINK)
#define SEALS_DENIED (F_SEAL_WRITE)
static int check_memfd_seals(struct file *memfd)
{
int seals;
if (!memfd)
return -EBADFD;
if (!shmem_file(memfd) && !is_file_hugepages(memfd))
return -EBADFD;
seals = memfd_fcntl(memfd, F_GET_SEALS, 0);
if (seals == -EINVAL)
return -EBADFD;
if ((seals & SEALS_WANTED) != SEALS_WANTED ||
(seals & SEALS_DENIED) != 0)
return -EINVAL;
return 0;
}
static int export_udmabuf(struct udmabuf *ubuf,
struct miscdevice *device,
u32 flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
struct dma_buf *buf;
ubuf->device = device;
exp_info.ops = &udmabuf_ops;
exp_info.size = ubuf->pagecount << PAGE_SHIFT;
exp_info.priv = ubuf;
exp_info.flags = O_RDWR;
buf = dma_buf_export(&exp_info);
if (IS_ERR(buf))
return PTR_ERR(buf);
return dma_buf_fd(buf, flags);
}
static long udmabuf_create(struct miscdevice *device,
struct udmabuf_create_list *head,
struct udmabuf_create_item *list)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
pgoff_t pgoff, pgcnt, pglimit, pgbuf = 0;
long nr_folios, ret = -EINVAL;
struct file *memfd = NULL;
struct address_space *mapping = NULL;
struct folio **folios;
struct udmabuf *ubuf;
struct dma_buf *buf;
pgoff_t pgoff, pgcnt, pgidx, pgbuf = 0, pglimit;
struct page *page;
int seals, ret = -EINVAL;
u32 i, flags;
u32 i, j, k, flags;
loff_t end;
ubuf = kzalloc(sizeof(*ubuf), GFP_KERNEL);
if (!ubuf)
return -ENOMEM;
INIT_LIST_HEAD(&ubuf->unpin_list);
pglimit = (size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
for (i = 0; i < head->count; i++) {
if (!IS_ALIGNED(list[i].offset, PAGE_SIZE))
@ -226,66 +322,84 @@ static long udmabuf_create(struct miscdevice *device,
if (!ubuf->pagecount)
goto err;
ubuf->pages = kmalloc_array(ubuf->pagecount, sizeof(*ubuf->pages),
ubuf->folios = kmalloc_array(ubuf->pagecount, sizeof(*ubuf->folios),
GFP_KERNEL);
if (!ubuf->pages) {
if (!ubuf->folios) {
ret = -ENOMEM;
goto err;
}
ubuf->offsets = kcalloc(ubuf->pagecount, sizeof(*ubuf->offsets),
GFP_KERNEL);
if (!ubuf->offsets) {
ret = -ENOMEM;
goto err;
}
pgbuf = 0;
for (i = 0; i < head->count; i++) {
ret = -EBADFD;
memfd = fget(list[i].memfd);
if (!memfd)
ret = check_memfd_seals(memfd);
if (ret < 0)
goto err;
mapping = memfd->f_mapping;
if (!shmem_mapping(mapping))
goto err;
seals = memfd_fcntl(memfd, F_GET_SEALS, 0);
if (seals == -EINVAL)
goto err;
ret = -EINVAL;
if ((seals & SEALS_WANTED) != SEALS_WANTED ||
(seals & SEALS_DENIED) != 0)
goto err;
pgoff = list[i].offset >> PAGE_SHIFT;
pgcnt = list[i].size >> PAGE_SHIFT;
for (pgidx = 0; pgidx < pgcnt; pgidx++) {
page = shmem_read_mapping_page(mapping, pgoff + pgidx);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
folios = kmalloc_array(pgcnt, sizeof(*folios), GFP_KERNEL);
if (!folios) {
ret = -ENOMEM;
goto err;
}
ubuf->pages[pgbuf++] = page;
end = list[i].offset + (pgcnt << PAGE_SHIFT) - 1;
ret = memfd_pin_folios(memfd, list[i].offset, end,
folios, pgcnt, &pgoff);
if (ret <= 0) {
kfree(folios);
if (!ret)
ret = -EINVAL;
goto err;
}
nr_folios = ret;
pgoff >>= PAGE_SHIFT;
for (j = 0, k = 0; j < pgcnt; j++) {
ubuf->folios[pgbuf] = folios[k];
ubuf->offsets[pgbuf] = pgoff << PAGE_SHIFT;
if (j == 0 || ubuf->folios[pgbuf-1] != folios[k]) {
ret = add_to_unpin_list(&ubuf->unpin_list,
folios[k]);
if (ret < 0) {
kfree(folios);
goto err;
}
}
pgbuf++;
if (++pgoff == folio_nr_pages(folios[k])) {
pgoff = 0;
if (++k == nr_folios)
break;
}
}
kfree(folios);
fput(memfd);
memfd = NULL;
}
exp_info.ops = &udmabuf_ops;
exp_info.size = ubuf->pagecount << PAGE_SHIFT;
exp_info.priv = ubuf;
exp_info.flags = O_RDWR;
ubuf->device = device;
buf = dma_buf_export(&exp_info);
if (IS_ERR(buf)) {
ret = PTR_ERR(buf);
flags = head->flags & UDMABUF_FLAGS_CLOEXEC ? O_CLOEXEC : 0;
ret = export_udmabuf(ubuf, device, flags);
if (ret < 0)
goto err;
}
flags = 0;
if (head->flags & UDMABUF_FLAGS_CLOEXEC)
flags |= O_CLOEXEC;
return dma_buf_fd(buf, flags);
return ret;
err:
while (pgbuf > 0)
put_page(ubuf->pages[--pgbuf]);
if (memfd)
fput(memfd);
kfree(ubuf->pages);
unpin_all_folios(&ubuf->unpin_list);
kfree(ubuf->offsets);
kfree(ubuf->folios);
kfree(ubuf);
return ret;
}

5
drivers/hv/hv_balloon.c
View File

@ -683,9 +683,8 @@ static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg)
if (!PageOffline(pg))
__SetPageOffline(pg);
return;
}
if (PageOffline(pg))
__ClearPageOffline(pg);
} else if (!PageOffline(pg))
return;
/* This frame is currently backed; online the page. */
generic_online_page(pg, 0);

Some files were not shown because too many files have changed in this diff Show More