2005-04-16 22:20:36 +00:00
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/*
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* S390 version
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2012-07-20 09:15:04 +00:00
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* Copyright IBM Corp. 1999
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2005-04-16 22:20:36 +00:00
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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2013-05-02 07:15:58 +00:00
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#include <linux/memory.h>
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2006-07-01 11:36:31 +00:00
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#include <linux/pfn.h>
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2006-12-08 14:56:13 +00:00
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#include <linux/poison.h>
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2007-02-05 20:16:47 +00:00
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#include <linux/initrd.h>
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2011-07-30 07:25:15 +00:00
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#include <linux/export.h>
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2017-08-07 13:16:15 +00:00
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#include <linux/cma.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/gfp.h>
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2015-05-08 15:40:43 +00:00
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#include <linux/memblock.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/processor.h>
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2016-12-24 19:46:01 +00:00
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#include <linux/uaccess.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/lowcore.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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2006-07-01 11:36:31 +00:00
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#include <asm/sections.h>
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2012-03-28 17:30:02 +00:00
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#include <asm/ctl_reg.h>
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2013-05-02 07:15:58 +00:00
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#include <asm/sclp.h>
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2017-05-08 22:58:08 +00:00
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#include <asm/set_memory.h>
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2005-04-16 22:20:36 +00:00
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2016-05-28 08:03:55 +00:00
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
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2009-03-26 14:24:04 +00:00
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2010-10-25 14:10:07 +00:00
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unsigned long empty_zero_page, zero_page_mask;
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2009-03-26 14:24:04 +00:00
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EXPORT_SYMBOL(empty_zero_page);
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2014-09-12 20:17:23 +00:00
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EXPORT_SYMBOL(zero_page_mask);
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2005-04-16 22:20:36 +00:00
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2013-04-29 22:06:48 +00:00
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static void __init setup_zero_pages(void)
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2010-10-25 14:10:07 +00:00
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{
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unsigned int order;
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struct page *page;
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int i;
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2015-11-10 11:30:28 +00:00
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/* Latest machines require a mapping granularity of 512KB */
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order = 7;
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2013-02-28 10:08:54 +00:00
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/* Limit number of empty zero pages for small memory sizes */
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2015-01-14 16:51:17 +00:00
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while (order > 2 && (totalram_pages >> 10) < (1UL << order))
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order--;
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2010-10-25 14:10:07 +00:00
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empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
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if (!empty_zero_page)
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panic("Out of memory in setup_zero_pages");
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page = virt_to_page((void *) empty_zero_page);
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split_page(page, order);
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for (i = 1 << order; i > 0; i--) {
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2013-04-29 22:06:48 +00:00
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mark_page_reserved(page);
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2010-10-25 14:10:07 +00:00
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page++;
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}
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2013-04-29 22:06:48 +00:00
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zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
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2010-10-25 14:10:07 +00:00
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}
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2005-04-16 22:20:36 +00:00
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/*
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* paging_init() sets up the page tables
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*/
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void __init paging_init(void)
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{
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2006-12-08 14:56:10 +00:00
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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2011-12-27 10:27:07 +00:00
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unsigned long pgd_type, asce_bits;
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2017-06-01 09:04:04 +00:00
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psw_t psw;
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2006-07-01 11:36:31 +00:00
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2007-10-22 10:52:47 +00:00
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init_mm.pgd = swapper_pg_dir;
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2017-07-05 05:37:27 +00:00
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if (VMALLOC_END > _REGION2_SIZE) {
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2011-12-27 10:27:07 +00:00
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asce_bits = _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
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pgd_type = _REGION2_ENTRY_EMPTY;
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} else {
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asce_bits = _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
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pgd_type = _REGION3_ENTRY_EMPTY;
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}
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s390/mm: fix asce_bits handling with dynamic pagetable levels
There is a race with multi-threaded applications between context switch and
pagetable upgrade. In switch_mm() a new user_asce is built from mm->pgd and
mm->context.asce_bits, w/o holding any locks. A concurrent mmap with a
pagetable upgrade on another thread in crst_table_upgrade() could already
have set new asce_bits, but not yet the new mm->pgd. This would result in a
corrupt user_asce in switch_mm(), and eventually in a kernel panic from a
translation exception.
Fix this by storing the complete asce instead of just the asce_bits, which
can then be read atomically from switch_mm(), so that it either sees the
old value or the new value, but no mixture. Both cases are OK. Having the
old value would result in a page fault on access to the higher level memory,
but the fault handler would see the new mm->pgd, if it was a valid access
after the mmap on the other thread has completed. So as worst-case scenario
we would have a page fault loop for the racing thread until the next time
slice.
Also remove dead code and simplify the upgrade/downgrade path, there are no
upgrades from 2 levels, and only downgrades from 3 levels for compat tasks.
There are also no concurrent upgrades, because the mmap_sem is held with
down_write() in do_mmap, so the flush and table checks during upgrade can
be removed.
Reported-by: Michael Munday <munday@ca.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-04-15 14:38:40 +00:00
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init_mm.context.asce = (__pa(init_mm.pgd) & PAGE_MASK) | asce_bits;
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S390_lowcore.kernel_asce = init_mm.context.asce;
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2017-07-05 05:37:27 +00:00
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crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
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2006-12-08 14:56:07 +00:00
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vmem_map_init();
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2005-04-16 22:20:36 +00:00
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/* enable virtual mapping in kernel mode */
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2007-10-22 10:52:47 +00:00
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__ctl_load(S390_lowcore.kernel_asce, 1, 1);
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__ctl_load(S390_lowcore.kernel_asce, 7, 7);
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__ctl_load(S390_lowcore.kernel_asce, 13, 13);
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2017-06-01 09:04:04 +00:00
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psw.mask = __extract_psw();
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2017-06-03 08:56:07 +00:00
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psw_bits(psw).dat = 1;
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2017-06-03 08:19:55 +00:00
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psw_bits(psw).as = PSW_BITS_AS_HOME;
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2017-06-01 09:04:04 +00:00
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__load_psw_mask(psw.mask);
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2005-04-16 22:20:36 +00:00
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2008-04-30 11:38:47 +00:00
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sparse_memory_present_with_active_regions(MAX_NUMNODES);
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sparse_init();
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2006-12-08 14:56:10 +00:00
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init_nodes(max_zone_pfns);
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2005-04-16 22:20:36 +00:00
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}
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2016-03-17 11:47:12 +00:00
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void mark_rodata_ro(void)
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{
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2016-06-07 08:12:55 +00:00
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unsigned long size = __end_ro_after_init - __start_ro_after_init;
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set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT);
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pr_info("Write protected read-only-after-init data: %luk\n", size >> 10);
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2016-03-17 11:47:12 +00:00
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}
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2005-04-16 22:20:36 +00:00
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void __init mem_init(void)
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{
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2016-05-25 07:45:26 +00:00
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cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
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2014-04-03 11:55:01 +00:00
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cpumask_set_cpu(0, mm_cpumask(&init_mm));
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2014-03-06 17:25:13 +00:00
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set_max_mapnr(max_low_pfn);
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2005-04-16 22:20:36 +00:00
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
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2008-05-07 07:22:59 +00:00
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/* Setup guest page hinting */
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cmma_init();
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2005-04-16 22:20:36 +00:00
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/* this will put all low memory onto the freelists */
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2013-07-03 22:03:24 +00:00
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free_all_bootmem();
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2013-04-29 22:06:48 +00:00
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setup_zero_pages(); /* Setup zeroed pages. */
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2005-04-16 22:20:36 +00:00
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2016-06-14 10:56:01 +00:00
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cmma_init_nodat();
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2013-07-03 22:04:10 +00:00
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mem_init_print_info(NULL);
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2005-04-16 22:20:36 +00:00
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}
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2010-02-26 21:37:42 +00:00
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void free_initmem(void)
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{
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2016-03-22 09:54:24 +00:00
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__set_memory((unsigned long) _sinittext,
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(_einittext - _sinittext) >> PAGE_SHIFT,
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SET_MEMORY_RW | SET_MEMORY_NX);
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2013-07-03 22:02:51 +00:00
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free_initmem_default(POISON_FREE_INITMEM);
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2005-04-16 22:20:36 +00:00
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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2012-09-24 06:17:58 +00:00
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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2005-04-16 22:20:36 +00:00
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{
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mm: change signature of free_reserved_area() to fix building warnings
Change signature of free_reserved_area() according to Russell King's
suggestion to fix following build warnings:
arch/arm/mm/init.c: In function 'mem_init':
arch/arm/mm/init.c:603:2: warning: passing argument 1 of 'free_reserved_area' makes integer from pointer without a cast [enabled by default]
free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL);
^
In file included from include/linux/mman.h:4:0,
from arch/arm/mm/init.c:15:
include/linux/mm.h:1301:22: note: expected 'long unsigned int' but argument is of type 'void *'
extern unsigned long free_reserved_area(unsigned long start, unsigned long end,
mm/page_alloc.c: In function 'free_reserved_area':
>> mm/page_alloc.c:5134:3: warning: passing argument 1 of 'virt_to_phys' makes pointer from integer without a cast [enabled by default]
In file included from arch/mips/include/asm/page.h:49:0,
from include/linux/mmzone.h:20,
from include/linux/gfp.h:4,
from include/linux/mm.h:8,
from mm/page_alloc.c:18:
arch/mips/include/asm/io.h:119:29: note: expected 'const volatile void *' but argument is of type 'long unsigned int'
mm/page_alloc.c: In function 'free_area_init_nodes':
mm/page_alloc.c:5030:34: warning: array subscript is below array bounds [-Warray-bounds]
Also address some minor code review comments.
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: <sworddragon2@aol.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Michel Lespinasse <walken@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03 22:02:48 +00:00
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free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
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"initrd");
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2005-04-16 22:20:36 +00:00
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}
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#endif
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2008-07-14 07:59:18 +00:00
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2017-02-13 13:58:36 +00:00
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unsigned long memory_block_size_bytes(void)
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{
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/*
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* Make sure the memory block size is always greater
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* or equal than the memory increment size.
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*/
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return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp.rzm);
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}
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2008-07-14 07:59:18 +00:00
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#ifdef CONFIG_MEMORY_HOTPLUG
|
2017-08-07 13:16:15 +00:00
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#ifdef CONFIG_CMA
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/* Prevent memory blocks which contain cma regions from going offline */
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struct s390_cma_mem_data {
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unsigned long start;
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unsigned long end;
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};
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static int s390_cma_check_range(struct cma *cma, void *data)
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{
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struct s390_cma_mem_data *mem_data;
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unsigned long start, end;
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|
|
mem_data = data;
|
|
|
|
start = cma_get_base(cma);
|
|
|
|
end = start + cma_get_size(cma);
|
|
|
|
if (end < mem_data->start)
|
|
|
|
return 0;
|
|
|
|
if (start >= mem_data->end)
|
|
|
|
return 0;
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int s390_cma_mem_notifier(struct notifier_block *nb,
|
|
|
|
unsigned long action, void *data)
|
|
|
|
{
|
|
|
|
struct s390_cma_mem_data mem_data;
|
|
|
|
struct memory_notify *arg;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
arg = data;
|
|
|
|
mem_data.start = arg->start_pfn << PAGE_SHIFT;
|
|
|
|
mem_data.end = mem_data.start + (arg->nr_pages << PAGE_SHIFT);
|
|
|
|
if (action == MEM_GOING_OFFLINE)
|
|
|
|
rc = cma_for_each_area(s390_cma_check_range, &mem_data);
|
|
|
|
return notifier_from_errno(rc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block s390_cma_mem_nb = {
|
|
|
|
.notifier_call = s390_cma_mem_notifier,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init s390_cma_mem_init(void)
|
|
|
|
{
|
|
|
|
return register_memory_notifier(&s390_cma_mem_nb);
|
|
|
|
}
|
|
|
|
device_initcall(s390_cma_mem_init);
|
|
|
|
|
|
|
|
#endif /* CONFIG_CMA */
|
|
|
|
|
2017-07-06 22:38:21 +00:00
|
|
|
int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
|
2008-07-14 07:59:18 +00:00
|
|
|
{
|
2012-02-24 17:01:29 +00:00
|
|
|
unsigned long start_pfn = PFN_DOWN(start);
|
|
|
|
unsigned long size_pages = PFN_DOWN(size);
|
2017-07-06 22:38:11 +00:00
|
|
|
int rc;
|
2008-07-14 07:59:18 +00:00
|
|
|
|
|
|
|
rc = vmem_add_mapping(start, size);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
2015-05-08 15:40:43 +00:00
|
|
|
|
2017-07-06 22:38:21 +00:00
|
|
|
rc = __add_pages(nid, start_pfn, size_pages, want_memblock);
|
2008-07-14 07:59:18 +00:00
|
|
|
if (rc)
|
|
|
|
vmem_remove_mapping(start, size);
|
|
|
|
return rc;
|
|
|
|
}
|
2013-02-23 00:32:58 +00:00
|
|
|
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
|
|
int arch_remove_memory(u64 start, u64 size)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* There is no hardware or firmware interface which could trigger a
|
|
|
|
* hot memory remove on s390. So there is nothing that needs to be
|
|
|
|
* implemented.
|
|
|
|
*/
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
#endif
|
2008-07-14 07:59:18 +00:00
|
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|