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authorJames Hogan <james.hogan@imgtec.com>2016-05-11 15:50:53 +0300
committerRalf Baechle <ralf@linux-mips.org>2016-05-13 16:30:25 +0300
commit30228c40f0c6f0a93910325f120904505a4c39cc (patch)
treee94f33f75456f37efe79b1bcfb7b5359035dfbb1 /arch/mips/oprofile
parentf18bdfa191df3947879f93519ce4a4985e5f5fce (diff)
downloadlinux-30228c40f0c6f0a93910325f120904505a4c39cc.tar.xz
MIPS: Add perf counter feature
Add CPU feature for standard MIPS r2 performance counters, as determined by the Config1.PC bit. Both perf_events and oprofile probe this bit, so lets combine the probing and change both to use cpu_has_perf. This will also be used for VZ support in KVM to know whether performance counters exist which can be exposed to guests. [ralf@linux-mips.org: resolve conflict.] Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Robert Richter <rric@kernel.org> Cc: linux-mips@linux-mips.org Cc: oprofile-list@lists.sf.net Patchwork: https://patchwork.linux-mips.org/patch/13226/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/oprofile')
-rw-r--r--arch/mips/oprofile/op_model_mipsxx.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
index 8f988a61b7a8..45cb27469fba 100644
--- a/arch/mips/oprofile/op_model_mipsxx.c
+++ b/arch/mips/oprofile/op_model_mipsxx.c
@@ -269,11 +269,9 @@ static int mipsxx_perfcount_handler(void)
return handled;
}
-#define M_CONFIG1_PC (1 << 4)
-
static inline int __n_counters(void)
{
- if (!(read_c0_config1() & M_CONFIG1_PC))
+ if (!cpu_has_perf)
return 0;
if (!(read_c0_perfctrl0() & M_PERFCTL_MORE))
return 1;