linux-stable.git/arch/x86/kernel/cpu/amd.c, branch v3.3

x86: Simplify code by removing a !SMP #ifdefs from 'struct cpuinfo_x86'

2011-12-21T08:25:09+00:00

Several fields in struct cpuinfo_x86 were not defined for the
!SMP case, likely to save space.  However, those fields still
have some meaning for UP, and keeping them allows some #ifdef
removal from other files.  The additional size of the UP kernel
from this change is not significant enough to worry about
keeping up the distinction:

	   text    data     bss     dec     hex filename
	4737168	 506459	 972040	6215667	 5ed7f3	vmlinux.o.before
	4737444	 506459	 972040	6215943	 5ed907	vmlinux.o.after

for a difference of 276 bytes for an example UP config.

If someone wants those 276 bytes back badly then it should
be implemented in a cleaner way.

Signed-off-by: Kevin Winchester 
Cc: Steffen Persvold 
Link: http://lkml.kernel.org/r/1324428742-12498-1-git-send-email-kjwinchester@gmail.com
Signed-off-by: Ingo Molnar

x86: Add x86_init platform override to fix up NUMA core numbering

2011-12-05T16:17:21+00:00

Add an x86_init vector for handling inconsistent core numbering.
This is useful for multi-fabric platforms, such as Numascale
NumaConnect.

v2:
 - use struct x86_cpuinit_ops
 - provide default fall-back function to warn

Signed-off-by: Daniel J Blueman 
Cc: Steffen Persvold 
Cc: Jesse Barnes 
Link: http://lkml.kernel.org/r/1323073238-32686-2-git-send-email-daniel@numascale-asia.com
Signed-off-by: Ingo Molnar

x86: Fix boot failures on older AMD CPU's

2011-12-04T19:57:09+00:00

People with old AMD chips are getting hung boots, because commit
bcb80e53877c ("x86, microcode, AMD: Add microcode revision to
/proc/cpuinfo") moved the microcode detection too early into
"early_init_amd()".

At that point we are *so* early in the booth that the exception tables
haven't even been set up yet, so the whole

	rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);

doesn't actually work: if the rdmsr does a GP fault (due to non-existant
MSR register on older CPU's), we can't fix it up yet, and the boot fails.

Fix it by simply moving the code to a slightly later point in the boot
(init_amd() instead of early_init_amd()), since the kernel itself
doesn't even really care about the microcode patchlevel at this point
(or really ever: it's made available to user space in /proc/cpuinfo, and
updated if you do a microcode load).

Reported-tested-and-bisected-by:  Larry Finger 
Tested-by: Bob Tracy 
Acked-by: Borislav Petkov 
Cc: Ingo Molnar 
Cc: Srivatsa S. Bhat 
Signed-off-by: Linus Torvalds

x86: Fix files explicitly requiring export.h for EXPORT_SYMBOL/THIS_MODULE

2011-10-31T23:30:35+00:00

These files were implicitly getting EXPORT_SYMBOL via device.h
which was including module.h, but that will be fixed up shortly.

By fixing these now, we can avoid seeing things like:

arch/x86/kernel/rtc.c:29: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL’
arch/x86/kernel/pci-dma.c:20: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL’
arch/x86/kernel/e820.c:69: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL_GPL’

[ with input from Randy Dunlap  and also
  from Stephen Rothwell  ]

Signed-off-by: Paul Gortmaker

Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2011-10-28T12:14:48+00:00

* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, microcode, AMD: Add microcode revision to /proc/cpuinfo
  x86, microcode: Correct microcode revision format
  coretemp: Get microcode revision from cpu_data
  x86, intel: Use c->microcode for Atom errata check
  x86, intel: Output microcode revision in /proc/cpuinfo
  x86, microcode: Don't request microcode from userspace unnecessarily

Fix up trivial conflicts in arch/x86/kernel/cpu/amd.c (conflict between
moving AMD BSP code to cpu_dev helper function and adding AMD microcode
revision to /proc/cpuinfo code)

x86, microcode, AMD: Add microcode revision to /proc/cpuinfo

2011-10-19T14:07:30+00:00

Enable microcode revision output for AMD after 506ed6b53e00 ("x86,
intel: Output microcode revision in /proc/cpuinfo") did it for Intel.

Signed-off-by: Borislav Petkov

x86, amd: Include elf.h explicitly, prepare the code for the module.h split

2011-08-10T08:14:09+00:00

When the moduleu.h splitting tree is merged to the latest
tip:x86/cpu tree, the x86_64 allmodconfig build fails like this:

 arch/x86/kernel/cpu/amd.c: In function 'bsp_init_amd':
 arch/x86/kernel/cpu/amd.c:437:3: error: 'va_align' undeclared (first use in this function)
 arch/x86/kernel/cpu/amd.c:438:23: error: 'ALIGN_VA_32' undeclared (first use in this function)
 arch/x86/kernel/cpu/amd.c:438:37: error: 'ALIGN_VA_64' undeclared (first use in this function)

This is caused by the module.h split up intreacting with commit
dfb09f9b7ab0 ("x86, amd: Avoid cache aliasing penalties on AMD
family 15h") from the tip:x86/cpu tree.

I have added the following patch for today (this, or something
similar, could be applied to the tip tree directly - the
export.h include below was added by the module.h splitup).

So include elf.h to use va_align and remove this implicit
dependency on module.h doing it for us.

Signed-off-by: Stephen Rothwell 
Cc: Borislav Petkov 
Cc: Peter Zijlstra 
Cc: Paul Gortmaker 
Link: http://lkml.kernel.org/r/20110810114956.238d66772883636e3040d29f@canb.auug.org.au
Signed-off-by: Ingo Molnar

x86, amd: Move BSP code to cpu_dev helper

2011-08-05T19:32:33+00:00

Move code which is run once on the BSP during boot into the cpu_dev
helper.

[ hpa: removed bogus cpu_has -> static_cpu_has conversion ]

Signed-off-by: Borislav Petkov 
Link: http://lkml.kernel.org/r/20110805180409.GC26217@aftab
Signed-off-by: H. Peter Anvin

x86, amd: Avoid cache aliasing penalties on AMD family 15h

2011-08-05T19:26:44+00:00

This patch provides performance tuning for the "Bulldozer" CPU. With its
shared instruction cache there is a chance of generating an excessive
number of cache cross-invalidates when running specific workloads on the
cores of a compute module.

This excessive amount of cross-invalidations can be observed if cache
lines backed by shared physical memory alias in bits [14:12] of their
virtual addresses, as those bits are used for the index generation.

This patch addresses the issue by clearing all the bits in the [14:12]
slice of the file mapping's virtual address at generation time, thus
forcing those bits the same for all mappings of a single shared library
across processes and, in doing so, avoids instruction cache aliases.

It also adds the command line option "align_va_addr=(32|64|on|off)" with
which virtual address alignment can be enabled for 32-bit or 64-bit x86
individually, or both, or be completely disabled.

This change leaves virtual region address allocation on other families
and/or vendors unaffected.

Signed-off-by: Borislav Petkov 
Link: http://lkml.kernel.org/r/1312550110-24160-2-git-send-email-bp@amd64.org
Signed-off-by: H. Peter Anvin

x86, amd: Do not enable ARAT feature on AMD processors below family 0x12

2011-05-26T17:38:30+00:00

Commit b87cf80af3ba4b4c008b4face3c68d604e1715c6 added support for
ARAT (Always Running APIC timer) on AMD processors that are not
affected by erratum 400. This erratum is present on certain processor
families and prevents APIC timer from waking up the CPU when it
is in a deep C state, including C1E state.

Determining whether a processor is affected by this erratum may
have some corner cases and handling these cases is somewhat
complicated. In the interest of simplicity we won't claim ARAT
support on processor families below 0x12 and will go back to
broadcasting timer when going idle.

Signed-off-by: Boris Ostrovsky 
Link: http://lkml.kernel.org/r/1306423192-19774-1-git-send-email-ostr@amd64.org
Tested-by: Boris Petkov 
Cc: Hans Rosenfeld 
Cc: Andreas Herrmann 
Cc: Chuck Ebbert 
Cc: stable@kernel.org # 32.x, 38.x, 39.x
Signed-off-by: H. Peter Anvin