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/kernel/power4-pmu.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/kernel/power4-pmu.c') diff --git a/arch/powerpc/kernel/power4-pmu.c b/arch/powerpc/kernel/power4-pmu.c index 81a1708f83b..db90b0c5c27 100644 --- a/arch/powerpc/kernel/power4-pmu.c +++ b/arch/powerpc/kernel/power4-pmu.c @@ -10,7 +10,9 @@ */ #include #include +#include #include +#include /* * Bits in event code for POWER4 @@ -587,7 +589,8 @@ static int power4_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { }, }; -struct power_pmu power4_pmu = { +static struct power_pmu power4_pmu = { + .name = "POWER4/4+", .n_counter = 8, .max_alternatives = 5, .add_fields = 0x0000001100005555ul, @@ -600,3 +603,13 @@ struct power_pmu power4_pmu = { .generic_events = p4_generic_events, .cache_events = &power4_cache_events, }; + +static int init_power4_pmu(void) +{ + if (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power4")) + return -ENODEV; + + return register_power_pmu(&power4_pmu); +} + +arch_initcall(init_power4_pmu); -- cgit v1.2.3