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linux-2.6/arch/powerpc/kernel
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Paul Mackerras a6dbf93a2a powerpc: Fix bug where perf_counters breaks oprofile 
Currently there is a bug where if you use oprofile on a pSeries
machine, then use perf_counters, then use oprofile again, oprofile
will not work correctly; it will lose the PMU configuration the next
time the hypervisor does a partition context switch, and thereafter
won't count anything.

Maynard Johnson identified the sequence causing the problem:
- oprofile setup calls ppc_enable_pmcs(), which calls
  pseries_lpar_enable_pmcs, which tells the hypervisor that we want
  to use the PMU, and sets the "PMU in use" flag in the lppaca.
  This flag tells the hypervisor whether it needs to save and restore
  the PMU config.
- The perf_counter code sets and clears the "PMU in use" flag directly
  as it context-switches the PMU between tasks, and leaves it clear
  when it finishes.
- oprofile setup, called for a new oprofile run, calls ppc_enable_pmcs,
  which does nothing because it has already been called.  In particular
  it doesn't set the "PMU in use" flag.

This fixes the problem by arranging for ppc_enable_pmcs to always set
the "PMU in use" flag.  It makes the perf_counter code call
ppc_enable_pmcs also rather than calling the lower-level function
directly, and removes the setting of the "PMU in use" flag from
pseries_lpar_enable_pmcs, since that is now done in its caller.

This also removes the declaration of pasemi_enable_pmcs because it
isn't defined anywhere.

Reported-by: Maynard Johnson <mpjohn@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: <stable@kernel.org)
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
 		2009-09-11 11:27:58 +10:00
..
vdso32 powerpc: Enable GCOV 2009-08-20 10:29:28 +10:00
vdso64 powerpc: Enable GCOV 2009-08-20 10:29:28 +10:00
.gitignore powerpc: Ignore generated vmlinux.lds in git 2008-10-07 14:26:18 +11:00
Makefile powerpc/pci: move pci_64.c device tree scanning code into pci-common.c 2009-08-28 14:24:15 +10:00
align.c powerpc: Keep track of emulated instructions 2009-05-21 15:44:26 +10:00
asm-offsets.c Merge commit 'paulus-perf/master' into next 2009-08-20 11:07:56 +10:00
audit.c
…
btext.c powerpc: Use the common ascii hex helpers 2008-08-20 16:34:57 +10:00
cacheinfo.c powerpc/cacheinfo: Rename cache_dir per-cpu variable 2009-01-13 14:48:02 +11:00
cacheinfo.h powerpc: Rewrite sysfs processor cache info code 2009-01-08 16:25:10 +11:00
clock.c
…
compat_audit.c
…
cpu_setup_6xx.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
cpu_setup_44x.S AMCC PPC 460SX redwood SoC platform initial framework 2009-02-14 14:41:29 -05:00
cpu_setup_fsl_booke.S powerpc/fsl-booke: Enable L1 cache on e500v1/e500v2/e500mc CPUs 2009-06-15 21:45:30 -05:00
cpu_setup_pa6t.S
…
cpu_setup_ppc970.S powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit 2008-09-15 11:08:35 -07:00
cputable.c powerpc/book3e-64: Move the default cpu table entry 2009-08-28 14:24:13 +10:00
crash.c powerpc: Increase CRASH_HANDLER_MAX 2008-06-30 22:31:00 +10:00
crash_dump.c powerpc: Unify opcode definitions and support 2009-02-23 10:48:56 +11:00
dbell.c powerpc: Add support for using doorbells for SMP IPI 2009-02-23 15:53:03 +11:00
dma-iommu.c powerpc: use dma_map_ops struct 2009-08-28 14:24:10 +10:00
dma-swiotlb.c powerpc: Handle SWIOTLB mapping error properly 2009-08-28 14:24:11 +10:00
dma.c powerpc: Add CONFIG_DMA_API_DEBUG support 2009-08-28 14:24:11 +10:00
entry_32.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
entry_64.S powerpc: Remaining 64-bit Book3E support 2009-08-20 10:25:11 +10:00
exceptions-64e.S powerpc/book3e-64: Add support to initial_tlb_book3e for non-HES TLB 2009-08-28 14:24:14 +10:00
exceptions-64s.S Merge commit 'paulus-perf/master' into next 2009-08-20 11:07:56 +10:00
firmware.c
…
fpu.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
ftrace.c 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
head_8xx.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
head_32.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
head_40x.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
head_44x.S powerpc/mm: Cleanup handling of execute permission 2009-08-27 13:12:51 +10:00
head_64.S powerpc: Remaining 64-bit Book3E support 2009-08-20 10:25:11 +10:00
head_booke.h powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
head_fsl_booke.S powerpc/fsl-booke: Use HW PTE format if CONFIG_PTE_64BIT 2009-09-02 16:20:41 +10:00
ibmebus.c powerpc: use dma_map_ops struct 2009-08-28 14:24:10 +10:00
idle.c powerpc: ftrace, do not latency trace idle 2008-11-20 10:51:15 -08:00
idle_6xx.S powerpc: Fix for getting CPU number in power_save_ppc32_restore() 2008-09-03 20:53:47 +10:00
idle_e500.S powerpc: Fix for getting CPU number in power_save_ppc32_restore() 2008-09-03 20:53:47 +10:00
idle_power4.S
…
init_task.c mm: consolidate init_mm definition 2009-06-16 19:47:28 -07:00
io.c ftrace: support for PowerPC 2008-05-23 22:43:11 +02:00
iomap.c
…
iommu.c powerpc: Change u64/s64 to a long long integer type 2009-01-13 14:47:59 +11:00
irq.c Merge commit 'origin/master' into next 2009-06-12 16:53:38 +10:00
isa-bridge.c [POWERPC] Remove leftover printk in isa-bridge.c 2008-05-09 20:22:59 +10:00
kgdb.c kgdb, x86, arm, mips, powerpc: ignore user space single stepping 2008-09-26 10:36:41 -05:00
kprobes.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-01-07 11:31:52 -08:00
l2cr_6xx.S
…
legacy_serial.c powerpc/powermac: Fixup default serial port device for pmac_zilog 2008-07-28 16:30:53 +10:00
lparcfg.c powerpc/pseries: Fix to handle slb resize across migration 2009-09-02 16:19:01 +10:00
machine_kexec.c powerpc: Allow mem=x cmdline to work with 4G+ 2009-05-15 16:43:41 +10:00
machine_kexec_32.c kexec jump: rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE 2008-08-15 08:35:42 -07:00
machine_kexec_64.c powerpc/32: Setup OF properties for kdump 2008-12-23 15:13:29 +11:00
misc.S powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit 2008-09-15 11:08:35 -07:00
misc_32.S powerpc: Fix __flush_icache_range on 44x 2009-08-27 13:12:52 +10:00
misc_64.S powerpc: Move VMX and VSX asm code to vector.S 2009-06-09 16:46:25 +10:00
module.c module: cleanup FIXME comments about trimming exception table entries. 2009-06-12 21:47:05 +09:30
module_32.c powerpc/ppc32: ftrace, dynamic ftrace to handle modules 2008-11-20 10:52:53 -08:00
module_64.c powerpc: Unify opcode definitions and support 2009-02-23 10:48:56 +11:00
mpc7450-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
msi.c powerpc/PCI: include pci.h in powerpc MSI implementation 2009-03-25 08:54:29 -07:00
nvram_64.c
…
of_device.c powerpc/of: Fix usage of dev_set_name() in of_device_alloc() 2009-06-26 16:55:35 +10:00
of_platform.c powerpc/pci: Merge ppc32 and ppc64 versions of phb_scan() 2009-09-02 15:45:53 +10:00
paca.c powerpc: Add PACA fields specific to 64-bit Book3E processors 2009-08-20 10:25:08 +10:00
pci-common.c powerpc/pci: Merge ppc32 and ppc64 versions of phb_scan() 2009-09-02 15:45:53 +10:00
pci_32.c powerpc/pci: Merge ppc32 and ppc64 versions of phb_scan() 2009-09-02 15:45:53 +10:00
pci_64.c powerpc/pci: Merge ppc32 and ppc64 versions of phb_scan() 2009-09-02 15:45:53 +10:00
pci_dn.c powerpc/pci: Move pseries code into pseries platform specific area 2009-05-21 15:44:24 +10:00
pci_of_scan.c powerpc/pci: move pci_64.c device tree scanning code into pci-common.c 2009-08-28 14:24:15 +10:00
perf_callchain.c perf_counter: powerpc: Add callchain support 2009-08-18 14:48:47 +10:00
perf_counter.c powerpc: Fix bug where perf_counters breaks oprofile 2009-09-11 11:27:58 +10:00
pmc.c [POWERPC] Made FSL Book-E PMC support more generic 2008-02-05 23:34:14 -06:00
power4-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
power5+-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
power5-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
power6-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
power7-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
ppc32.h powerpc: Add VSX context save/restore, ptrace and signal support 2008-07-01 11:28:50 +10:00
ppc970-pmu.c perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it 2009-08-06 13:55:09 +02:00
ppc_ksyms.c powerpc: Export cacheable_memzero as its now used in a driver 2009-01-08 16:25:17 +11:00
ppc_save_regs.S powerpc: Prepare xmon_save_regs for use with kdump 2008-12-23 15:13:28 +11:00
proc_ppc64.c powerpc: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
process.c powerpc: Clean ifdef usage in copy_thread() 2009-08-20 10:12:43 +10:00
prom.c powerpc: Shield code specific to 64-bit server processors 2009-06-09 16:47:38 +10:00
prom_init.c powerpc/prom_init: Evaluate mem kernel parameter for early allocation 2009-08-20 10:29:25 +10:00
prom_init_check.sh powerpc: Print linux_banner in prom_init 2009-03-11 17:11:33 +11:00
prom_parse.c powerpc: Fix of_node_put() exit path in of_irq_map_one() 2009-04-20 12:18:43 -06:00
ptrace.c powerpc: Fix booke user_disable_single_step() 2009-07-15 17:41:45 +10:00
ptrace32.c headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
reloc_64.S powerpc: Make the 64-bit kernel as a position-independent executable 2008-09-15 11:08:38 -07:00
rtas-proc.c [POWERPC] Fix sparse warnings in arch/powerpc/kernel 2008-05-14 22:31:59 +10:00
rtas-rtc.c
…
rtas.c powerpc/pseries: Fix to handle slb resize across migration 2009-09-02 16:19:01 +10:00
rtas_flash.c proc 2/2: remove struct proc_dir_entry::owner 2009-03-31 01:14:44 +04:00
rtas_pci.c powerpc/pci: Clean up direct access to sysdata by RTAS 2009-05-21 15:44:23 +10:00
setup-common.c powerpc: Remove duplicated #include's 2009-04-07 15:18:58 +10:00
setup.h
…
setup_32.c powerpc: Add irqtrace support for 32-bit powerpc 2009-06-26 14:37:27 +10:00
setup_64.c powerpc: Remaining 64-bit Book3E support 2009-08-20 10:25:11 +10:00
signal.c powerpc: Sanitize stack pointer in signal handling code 2009-03-27 16:58:24 +11:00
signal.h powerpc: Sanitize stack pointer in signal handling code 2009-03-27 16:58:24 +11:00
signal_32.c powerpc: Sanitize stack pointer in signal handling code 2009-03-27 16:58:24 +11:00
signal_64.c powerpc: Sanitize stack pointer in signal handling code 2009-03-27 16:58:24 +11:00
smp-tbsync.c powerpc: Silence software timebase sync 2008-11-05 22:08:28 +11:00
smp.c powerpc/85xx: Fix SMP compile error and allow NULL for smp_ops 2009-09-11 11:27:57 +10:00
softemu8xx.c Remove asm/a.out.h files for all architectures without a.out support. 2008-09-06 19:30:24 +01:00
stacktrace.c powerpc: Removed duplicated include in stacktrace.c 2008-07-28 16:30:47 +10:00
suspend.c PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
swsusp.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
swsusp_32.S powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
swsusp_64.c
…
swsusp_asm64.S powerpc: Fix 64-bit hibernation with 64k pages 2008-10-07 14:26:20 +11:00
sys_ppc32.c powerpc: Add compat_sys_truncate 2009-08-20 10:12:34 +10:00
syscalls.c powerpc/mm: Add Strong Access Ordering support 2008-07-09 16:30:45 +10:00
sysfs.c powerpc: Fix bug where perf_counters breaks oprofile 2009-09-11 11:27:58 +10:00
systbl.S
…
systbl_chk.c
…
systbl_chk.sh
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tau_6xx.c on_each_cpu(): kill unused 'retry' parameter 2008-06-26 11:24:38 +02:00
time.c powerpc: Properly start decrementer on BookE secondary CPUs 2009-08-28 14:25:04 +10:00
traps.c powerpc: Add PTRACE_SINGLEBLOCK support 2009-06-09 13:29:25 +10:00
udbg.c powerpc/udbg: Fix lost byte during console handover; change LFCR to CRLF 2009-03-11 17:11:34 +11:00
udbg_16550.c powerpc/440: Fix warning early debug code 2009-06-26 16:55:35 +10:00
vdso.c powerpc: Move 64bit VDSO to improve context switch performance 2009-08-20 10:12:24 +10:00
vecemu.c
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vector.S powerpc: Use names rather than numbers for SPRGs (v2) 2009-08-20 10:12:27 +10:00
vio.c powerpc: use dma_map_ops struct 2009-08-28 14:24:10 +10:00
vmlinux.lds.S powerpc/vmlinux.lds: Move _edata down 2009-08-20 10:29:29 +10:00