linux/arch
Yong Wang c14dab5c07 perf_counter, x86: Set global control MSR correctly
Previous code made an assumption that the power on value of global
control MSR has enabled all fixed and general purpose counters properly.

However, this is not the case for certain Intel processors, such as
Atom - and it might also be firmware dependent.

Each enable bit in IA32_PERF_GLOBAL_CTRL is AND'ed with the
enable bits for all privilege levels in the respective IA32_PERFEVTSELx
or IA32_PERF_FIXED_CTR_CTRL MSRs to start/stop the counting of
respective counters. Counting is enabled if the AND'ed results is true;
counting is disabled when the result is false.

The end result is that all fixed counters are always disabled on Atom
processors because the assumption is just invalid.

Fix this by not initializing the ctrl-mask out of the global MSR,
but setting it to perf_counter_mask.

Reported-by: Stephane Eranian <eranian@googlemail.com>
Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20090624021324.GA2788@ywang-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-06-24 10:51:24 +02:00
..
alpha Delete pcibios_select_root 2009-06-17 14:04:42 -07:00
arm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-06-20 10:17:02 -07:00
avr32 ptrace: remove PT_DTRACE from avr32, mn10300, parisc, s390, sh, xtensa 2009-06-18 13:03:48 -07:00
blackfin Blackfin: convert page/tlb to asm-generic 2009-06-18 21:42:30 -04:00
cris kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
frv mm: consolidate init_mm definition 2009-06-16 19:47:28 -07:00
h8300 ptrace: remove PT_DTRACE from arch/h8300 2009-06-18 13:03:48 -07:00
ia64 dma-mapping: ia64: add CONFIG_DMA_API_DEBUG support 2009-06-18 13:03:58 -07:00
m32r ptrace: remove PT_DTRACE from arch/m32r 2009-06-18 13:03:49 -07:00
m68k ptrace: remove PT_DTRACE from m68k, m68knommu 2009-06-18 13:03:48 -07:00
m68knommu ptrace: remove PT_DTRACE from m68k, m68knommu 2009-06-18 13:03:48 -07:00
microblaze microblaze: Add missing symbols for CONSTRUCTORS support 2009-06-20 14:36:58 +02:00
mips Delete pcibios_select_root 2009-06-17 14:04:42 -07:00
mn10300 MN10300: Add support for new ELF relocs in kernel modules 2009-06-18 13:10:33 -07:00
parisc ptrace: remove PT_DTRACE from avr32, mn10300, parisc, s390, sh, xtensa 2009-06-18 13:03:48 -07:00
powerpc Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-20 11:29:32 -07:00
s390 Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-20 10:56:46 -07:00
sh Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2009-06-18 14:07:35 -07:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6 2009-06-19 17:42:01 -07:00
um Merge branch 'akpm' 2009-06-16 19:50:13 -07:00
x86 perf_counter, x86: Set global control MSR correctly 2009-06-24 10:51:24 +02:00
xtensa ptrace: remove PT_DTRACE from avr32, mn10300, parisc, s390, sh, xtensa 2009-06-18 13:03:48 -07:00
.gitignore
Kconfig gcov: add gcov profiling infrastructure 2009-06-18 13:03:57 -07:00