This adds the PTE and pgtable format definitions, along with changes
to the kernel memory map and other definitions related to implementing
support for 64-bit Book3E. This also shields some asm-offset bits that
are currently only relevant on 32-bit
We also move the definition of the "linux" page size constants to
the common mmu.h file and add a few sizes that are relevant to
embedded processors.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This adds various SPRs defined on 64-bit BookE, along with changes
to the definition of the base MSR values to add the values needed
for 64-bit Book3E.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
That patch used to just add a hook to page table flushing but
pulling that string brought out a whole bunch of issues, so it
now does that and more:
- We now make the RCU batching of page freeing SMP only, as I
believe it was intended initially. We make a few more things compile
to nothing on !CONFIG_SMP
- Some macros are turned into functions, though that forced me to
out of line a few stuffs due to unsolvable include depenencies,
however it's probably better that way anyway, it's not -that-
critical code path.
- 32-bit didn't call pte_free_finish() on tlb_flush() which means
that it wouldn't push out the batch to RCU for delayed freeing when
a bunch of page tables have been freed, they would just stay in there
until the batch gets full.
64-bit BookE will use that hook to maintain the virtually linear
page tables or the indirect entries in the TLB when using the
HW loader.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Those definitions are currently declared extern in the .c file where
they are used, move them to a header file instead.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Currently, a single ifdef covers SLB related bits and more generic ppc64
related bits, split this in two separate ifdef's since 64-bit BookE will
need one but not the other.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Our 64-bit hash context handling has no init function, but 64-bit Book3E
will use the common mmu_context_nohash.c code which does, so define an
empty inline mmu_context_init() for 64-bit server and call it from
our 64-bit setup_arch()
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
We need to pass down whether the page is direct or indirect and we'll
need to pass the page size to _tlbil_va and _tlbivax_bcast
We also add a new low level _tlbil_pid_noind() which does a TLB flush
by PID but avoids flushing indirect entries if possible
This implements those new prototypes but defines them with inlines
or macros so that no additional arguments are actually passed on current
processors.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The way I intend to use tophys/tovirt on 64-bit BookE is different
from the "trick" that we currently play for 32-bit BookE so change
the condition of definition of these macros to make it so.
Also, make sure we only use rfid and mtmsrd instead of rfi and mtmsr
for 64-bit server processors, not all 64-bit processors.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
This adds some code to do early ioremap's using page tables instead of
bolting entries in the hash table. This will be used by the upcoming
64-bits BookE port.
The patch also changes the test for early vs. late ioremap to use
slab_is_available() instead of our old hackish mem_init_done.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This adds various additional bit definitions for various MMU related
SPRs used on Book3E.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This adds the opcode definitions to ppc-opcode.h for the two instructions
tlbivax and tlbsrx. as defined by Book3E 2.06
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The current "no hash" MMU context management code is written with
the assumption that one CPU == one TLB. This is not the case on
implementations that support HW multithreading, where several
linux CPUs can share the same TLB.
This adds some basic support for this to our context management
and our TLB flushing code.
It also cleans up the optional debugging output a bit
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
enter_prom() used to save and restore registers such as CTR, XER etc..
which are volatile, or SRR0,1... which we don't care about. This
removes a bunch of useless code and while at it turns an mtmsrd into
an MTMSRD macro which will be useful to Book3E.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
A misplaced #endif causes more definitions than intended to be
protected by #ifndef __ASSEMBLY__. This breaks upcoming 64-bit
BookE support patch when using 64k pages.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The truncate syscall has a signed long parameter, so when using a 32-
bit userspace with a 64-bit kernel the argument is zero-extended
instead of sign-extended. Adding the compat_sys_truncate function
fixes the issue.
This was noticed during an LSB truncate test failure. The test was
checking for the correct error number set when truncate is called with
a length of -1. The test can be found at:
http://bzr.linuxfoundation.org/lsb/devel/runtime-test?cmd=inventory;rev=stewb%40linux-foundation.org-20090626205411-sfb23cc0tjj7jzgm;path=modules/vsx-pcts/tset/POSIX.os/files/truncate/
BenH: Added compat_sys_ftruncate() as well, same issue.
Signed-off-by: Chase Douglas <cndougla@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
dtc was moved in 9fffb55f66 from
arch/powerpc/boot/ to scripts/dtc/
This patch updates the wrapper script to point to the new location of dtc.
Signed-off-by: Lucian Adrian Grijincu <lgrijincu@ixiacom.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Frans Pop <elendil@planet.nl>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This change the SPRG used to store the PACA on ppc64 from
SPRG3 to SPRG1. SPRG3 is user readable on most processors
and we want to use it for other things. We change the scratch
SPRG used by exception vectors from SRPG1 to SPRG2.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The code for setting up the IPIs for SMP PowerSurge marchines bitrot,
it needs to properly map the HW interrupt number
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The current definitions set ranges and defaults for 32 and 64-bit
only using "PPC_STD_MMU" which means hash based MMU. This uselessly
restrict the usefulness for the upcoming 64-bit BookE port, but more
than that, it's broken on 32-bit since the only 32-bit platform
supporting multiple page sizes currently is 44x which does -not-
have PPC_STD_MMU_32 set.
This fixes it by using PPC64 and PPC32 instead.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Replace strncpy() and explicit null-termination by strlcpy()
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The STAB code used on Power3 and RS/64 uses a second scratch SPRG to
save a GPR in order to decide whether to go to do_stab_bolted_* or
to handle a normal data access exception.
This prevents our scheme of freeing SPRG3 which is user visible for
user uses since we cannot use SPRG0 which, on RS/64, seems to be
read-only for supervisor mode (like POWER4).
This reworks the STAB exception entry to use the PACA as temporary
storage instead.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The kernel uses SPRG registers for various purposes, typically in
low level assembly code as scratch registers or to hold per-cpu
global infos such as the PACA or the current thread_info pointer.
We want to be able to easily shuffle the usage of those registers
as some implementations have specific constraints realted to some
of them, for example, some have userspace readable aliases, etc..
and the current choice isn't always the best.
This patch should not change any code generation, and replaces the
usage of SPRN_SPRGn everywhere in the kernel with a named replacement
and adds documentation next to the definition of the names as to
what those are used for on each processor family.
The only parts that still use the original numbers are bits of KVM
or suspend/resume code that just blindly needs to save/restore all
the SPRGs.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The file include/asm/exception.h contains definitions
that are specific to exception handling on 64-bit server
type processors.
This renames the file to exception-64s.h to reflect that
fact and avoid confusion.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
TASK_UNMAPPED_BASE is not used with the new top down mmap layout. We can
reuse this preload slot by loading in the segment at 0x10000000, where almost
all PowerPC binaries are linked at.
On a microbenchmark that bounces a token between two 64bit processes over pipes
and calls gettimeofday each iteration (to access the VDSO), both the 32bit and
64bit context switch rate improves (tested on a 4GHz POWER6):
32bit: 273k/sec -> 283k/sec
64bit: 277k/sec -> 284k/sec
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
With the new top down layout it is likely that the pc and stack will be in the
same segment, because the pc is most likely in a library allocated via a top
down mmap. Right now we bail out early if these segments match.
Rearrange the SLB preload code to sanity check all SLB preload addresses
are not in the kernel, then check all addresses for conflicts.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO
is position independent we can remove the hint and let get_unmapped_area pick
an area. This will mean the vdso will be near other mmaps and will share
an SLB entry:
10000000-10001000 r-xp 00000000 08:06 5778459 /root/context_switch_64
10010000-10011000 r--p 00000000 08:06 5778459 /root/context_switch_64
10011000-10012000 rw-p 00001000 08:06 5778459 /root/context_switch_64
fffa92ae000-fffa92b0000 rw-p 00000000 00:00 0
fffa92b0000-fffa9453000 r-xp 00000000 08:06 4334051 /lib64/power6/libc-2.9.so
fffa9453000-fffa9462000 ---p 001a3000 08:06 4334051 /lib64/power6/libc-2.9.so
fffa9462000-fffa9466000 r--p 001a2000 08:06 4334051 /lib64/power6/libc-2.9.so
fffa9466000-fffa947c000 rw-p 001a6000 08:06 4334051 /lib64/power6/libc-2.9.so
fffa947c000-fffa9480000 rw-p 00000000 00:00 0
fffa9480000-fffa94a8000 r-xp 00000000 08:06 4333852 /lib64/ld-2.9.so
fffa94b3000-fffa94b4000 rw-p 00000000 00:00 0
fffa94b4000-fffa94b7000 r-xp 00000000 00:00 0 [vdso] <----- here I am
fffa94b7000-fffa94b8000 r--p 00027000 08:06 4333852 /lib64/ld-2.9.so
fffa94b8000-fffa94bb000 rw-p 00028000 08:06 4333852 /lib64/ld-2.9.so
fffa94bb000-fffa94bc000 rw-p 00000000 00:00 0
fffe4c10000-fffe4c25000 rw-p 00000000 00:00 0 [stack]
On a microbenchmark that bounces a token between two 64bit processes over pipes
and calls gettimeofday each iteration (to access the VDSO), our context switch
rate goes from 268k to 277k ctx switches/sec (tested on a 4GHz POWER6).
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The bitops.h functions that operate on a single bit in a bitfield are
implemented by operating on the corresponding word location. In all
cases the inner logic is valid if the mask being applied has more than
one bit set, so this patch exposes those inner operations. Indeed,
set_bits() was already available, but it duplicated code from
set_bit() (rather than making the latter a wrapper) - it was also
missing the PPC405_ERR77() workaround and the "volatile" address
qualifier present in other APIs. This corrects that, and exposes the
other multi-bit equivalents.
One advantage of these multi-bit forms is that they allow word-sized
variables to essentially be their own spinlocks, eg. very useful for
state machines where an atomic "flags" variable can obviate the need
for any additional locking.
Signed-off-by: Geoff Thorpe <geoff@geoffthorpe.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The workaround enabled by CONFIG_MPIC_BROKEN_REGREAD does not work
on non-broken MPICs. The symptom is no interrupts being received.
The fix is twofold. Firstly the code was broken for multiple isus,
we need to index into the shadow array with the src_no, not the idx.
Secondly, we always do the read, but only use the VECPRI_MASK and
VECPRI_ACTIVITY bits from the hardware, the rest of "val" comes
from the shadow.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This allows to remove the ppc_md.init() hook in the setup code.
Signed-off-by: Gerhard Pircher <gerhard_pircher@gmx.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Make sure the stack-protector segment registers are properly set up
before calling any functions which may have stack-protection compiled
into them.
[ Impact: prevent Xen early-boot crash when stack-protector is enabled ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
load_percpu_segment() is used to set up the per-cpu segment registers,
which are also used for -fstack-protector. Make sure that the
load_percpu_segment() function doesn't have stackprotector enabled.
[ Impact: allow percpu setup before calling stack-protected functions ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
generic_file_direct_write() no longer calls generic_osync_inode() so remove the
comment.
CC: linux-nfs@vger.kernel.org
CC: Neil Brown <neilb@suse.de>
CC: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Otherwise we Oops if the module containing the cache detail is removed
before all cache readers have closed the file.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
In the referral code, use it to look up the new server's ip address if the
fs_locations attribute contains a hostname.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
The NFSv4 and NFSv4.1 protocols both allow for the redirection of a client
from one server to another in order to support filesystem migration and
replication. For full protocol support, we need to add the ability to
convert a DNS host name into an IP address that we can feed to the RPC
client.
We'll reuse the sunrpc cache, now that it has been converted to work with
rpc_pipefs.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
It's too stupid to see that we always set flen to something
before we use it in ppp_mp_explode():
drivers/net/ppp_generic.c: In function 'ppp_push':
drivers/net/ppp_generic.c:1314: warning: 'flen' may be used uninitialized in this function
drivers/net/ppp_generic.c:1314: note: 'flen' was declared here
This started warning after commit a53a8b5682
("ppp: fix lost fragments in ppp_mp_explode() (resubmit)")
So just put an explicit unconditional initialization there to
hush it up.
Signed-off-by: David S. Miller <davem@davemloft.net>
Used for applications such as direct bluetooth connections on
smartphones which don't go via the CPU. This used to be supported
before the refactoring to share code but this check was removed
during that move.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Fix build errors due to missing Kconfig select of CRC32:
ks8851.c:(.text+0x7d2ee): undefined reference to `crc32_le'
ks8851.c:(.text+0x7d2f5): undefined reference to `bitrev32'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There are not maste devices in mac802154 anymore, so drop
ARPHRD_IEEE802154_PHY definition.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
IEEE 802.15.4-2006 adds new concept: channel pages, which can contain several
channels. Add support for channel pages in the API and in the fakehard driver.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Make fakehard create and maintain wpan-phy node, thus representing
it's phy in the sysfs.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
There are many variants of Toshiba laptops with ALC268 codec, and
it seems that a few of them don't work with model=toshiba preset
since they have the secondary ALC268 codec just for HDMI output.
This is a regression due to the previous clean-up work to merge all
Toshiba quirk entries into a single check.
This patch adds the identification of such laptops to apply the
standard BIOS-probing method. Unfortunately, Toshiba laptops have
all the same PCI SSID, so we need to check the codec SSID to identify
each device.
Tested-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
