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authorPaul Mackerras <paulus@samba.org>2009-06-17 21:52:09 +1000
committerIngo Molnar <mingo@elte.hu>2009-06-18 11:11:45 +0200
commit079b3c569c87819e7a19d9b9f51d4746fc47bf9a (patch)
tree63dd236c582eebebb0667a3e5235b02b14c850be /arch/powerpc/include
parent448d64f8f4c147db466c549550767cc515a4d34c (diff)
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 <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> 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 <mingo@elte.hu>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/perf_counter.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/perf_counter.h b/arch/powerpc/include/asm/perf_counter.h
index 2ceb0fefa93a..8ccd4e155768 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);