[IA64] Itanium MC Error Injection Tool: Kernel configuration

This patch has kenrel configuration changes for the MC Error Injection
Tool.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] Itanium MC Error Injection Tool: Doc and sample application

This patch contains a documention and sample application. Since the sample
application has ~1000 lines of code, it might not be suitable in a kernel
documention in kenrel tree. If you think this is not good place to hold
the sample application, please let me know and I'm open to other choices
e.g. sourceforge etc.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] Itanium MC Error Injection Tool: Driver sysfs interface

This kernel driver patch provides sysfs interface for user application to
call pal_mc_error_inject() procedure.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] Itanium MC Error Injection Tool: Makefile changes

This patch has Makefile changes.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] Itanium MC Error Injection Tool: pal_mc_error_inject() interface

This patch implements pal_mc_error_inject() interface in kernel. Both physical
mode and virtual mode are supported.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] Fix example error injection program

Progam accessed using /sys/devices/system/node/node0/cpu%d/err_inject/
This path only exists for CONFIG_NUMA=y systems.  Better to use
/sys/devices/system/cpu/cpu%d/err_inject/ which is available on all
systems.

Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] remove per-cpu ia64_phys_stacked_size_p8

It's not efficient to use a per-cpu variable just to store
how many physical stack register a cpu has.  Ever since the
incarnation of ia64 up till upcoming Montecito processor, that
variable has "glued" to 96. Having a variable in memory means
that the kernel is burning an extra cacheline access on every
syscall and kernel exit path.  Such "static" value is better
served with the instruction patching utility exists today.
Convert ia64_phys_stacked_size_p8 into dynamic insn patching.

This also has a pleasant side effect of eliminating access to
per-cpu area while psr.ic=0 in the kernel exit path. (fixable
for per-cpu DTC work, but why bother?)

There are some concerns with the default value that the instruc-
tion encoded in the kernel image.  It shouldn't be concerned.
The reasons are:

(1) cpu_init() is called at CPU initialization.  In there, we
    find out physical stack register size from PAL and patch
    two instructions in kernel exit code.  The code in question
    can not be executed before the patching is done.

(2) current implementation stores zero in ia64_phys_stacked_size_p8,
    and that's what the current kernel exit path loads the value with.
    With the new code, it is equivalent that we store reg size 96
    in ia64_phys_stacked_size_p8, thus creating a better safety net.
    Given (1) above can never fail, having (2) is just a bonus.

All in all, this patch allow one less memory reference in the kernel
exit path, thus reducing syscall and interrupt return latency; and
avoid polluting potential useful data in the CPU cache.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[IA64] relax per-cpu TLB requirement to DTC

Instead of pinning per-cpu TLB into a DTR, use DTC.  This will free up
one TLB entry for application, or even kernel if access pattern to
per-cpu data area has high temporal locality.

Since per-cpu is mapped at the top of region 7 address, we just need to
add special case in alt_dtlb_miss.  The physical address of per-cpu data
is already conveniently stored in IA64_KR(PER_CPU_DATA).  Latency for
alt_dtlb_miss is not affected as we can hide all the latency.  It was
measured that alt_dtlb_miss handler has 23 cycles latency before and
after the patch.

The performance effect is massive for applications that put lots of tlb
pressure on CPU.  Workload environment like database online transaction
processing or application uses tera-byte of memory would benefit the most.
Measurement with industry standard database benchmark shown an upward
of 1.6% gain.  While smaller workloads like cpu, java also showing small
improvement.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
drm: remove unused exports

This patch removes two unused exports.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: update README.drm (bugzilla #7933)

Update URLs in drivers/char/drm/README.drm, to take care of kernel bugzilla

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: Use ARRAY_SIZE macro when appropriate

Use ARRAY_SIZE macro already defined in kernel.h

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: move protection stuff into separate function

Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: bring bufs code from git tree.

This checks the AGP mappings are in a valid place and also fixes the size
check in the vm..

Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: fix crash with fops lock and fixup sarea/page size locking

Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: port over use_vmalloc code from git hashtab

Signed-off-by: Dave Airlie <airlied@linux.ie>
drm/radeon: Fix u32 overflows when determining AGP base address in card space.

The overflows could lead to the AGP aperture overlapping the framebuffer are    in the card's address space when the latter is located at the very end of th    32 bit address space, which would result in a freeze on X server startup,
probably because the card read commands from the framebuffer instead of from    AGP.

See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=392915 .

Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: add missing NULL assignment

Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: remove via_mm.h

Delete apparently unused header file drivers/char/drm/via_mm.h.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
drm: make drm_io_prot static.

This patch makes the needlessly global drm_io_prot() static.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave Airlie <airlied@linux.ie>
via: fix CX700 pci id

Signed-off-by: Dave Airlie <airlied@linux.ie>