path: root/arch/powerpc/kernel/power5-pmu.c
diff options
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/kernel/power5-pmu.c
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/kernel/power5-pmu.c')
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/power5-pmu.c b/arch/powerpc/kernel/power5-pmu.c
index 8694c73bfb5..29b2c6c0e83 100644
--- a/arch/powerpc/kernel/power5-pmu.c
+++ b/arch/powerpc/kernel/power5-pmu.c
@@ -10,7 +10,9 @@
#include <linux/kernel.h>
#include <linux/perf_counter.h>
+#include <linux/string.h>
#include <asm/reg.h>
+#include <asm/cputable.h>
* Bits in event code for POWER5 (not POWER5++)
@@ -599,7 +601,8 @@ static int power5_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
-struct power_pmu power5_pmu = {
+static struct power_pmu power5_pmu = {
+ .name = "POWER5",
.n_counter = 6,
.max_alternatives = MAX_ALT,
.add_fields = 0x7000090000555ul,
@@ -612,3 +615,13 @@ struct power_pmu power5_pmu = {
.generic_events = power5_generic_events,
.cache_events = &power5_cache_events,
+static int init_power5_pmu(void)
+ if (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power5"))
+ return -ENODEV;
+ return register_power_pmu(&power5_pmu);