From 079b3c569c87819e7a19d9b9f51d4746fc47bf9a Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Wed, 17 Jun 2009 21:52:09 +1000 Subject: perf_counter: powerpc: Change how processor-specific back-ends get selected At present, the powerpc generic (processor-independent) perf_counter code has list of processor back-end modules, and at initialization, it looks at the PVR (processor version register) and has a switch statement to select a suitable processor-specific back-end. This is going to become inconvenient as we add more processor-specific back-ends, so this inverts the order: now each back-end checks whether it applies to the current processor, and registers itself if so. Furthermore, instead of looking at the PVR, back-ends now check the cur_cpu_spec->oprofile_cpu_type string and match on that. Lastly, each back-end now specifies a name for itself so the core can print a nice message when a back-end registers itself. This doesn't provide any support for unregistering back-ends, but that wouldn't be hard to do and would allow back-ends to be modules. Signed-off-by: Paul Mackerras Cc: Peter Zijlstra Cc: linuxppc-dev@ozlabs.org Cc: benh@kernel.crashing.org LKML-Reference: <19000.55529.762227.518531@cargo.ozlabs.ibm.com> Signed-off-by: Ingo Molnar --- arch/powerpc/include/asm/perf_counter.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'arch/powerpc/include/asm') diff --git a/arch/powerpc/include/asm/perf_counter.h b/arch/powerpc/include/asm/perf_counter.h index 2ceb0fefa93..8ccd4e15576 100644 --- a/arch/powerpc/include/asm/perf_counter.h +++ b/arch/powerpc/include/asm/perf_counter.h @@ -21,6 +21,7 @@ * describe the PMU on a particular POWER-family CPU. */ struct power_pmu { + const char *name; int n_counter; int max_alternatives; unsigned long add_fields; @@ -41,8 +42,6 @@ struct power_pmu { [PERF_COUNT_HW_CACHE_RESULT_MAX]; }; -extern struct power_pmu *ppmu; - /* * Values for power_pmu.flags */ @@ -56,6 +55,8 @@ extern struct power_pmu *ppmu; #define PPMU_LIMITED_PMC_REQD 2 /* have to put this on a limited PMC */ #define PPMU_ONLY_COUNT_RUN 4 /* only counting in run state */ +extern int register_power_pmu(struct power_pmu *); + struct pt_regs; extern unsigned long perf_misc_flags(struct pt_regs *regs); extern unsigned long perf_instruction_pointer(struct pt_regs *regs); -- cgit v1.2.3-70-g09d2