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| author | James Hogan <james.hogan@imgtec.com> | 2016-05-11 14:50:53 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 15:30:25 +0200 |
| commit | 30228c40f0c6f0a93910325f120904505a4c39cc (patch) | |
| tree | e94f33f75456f37efe79b1bcfb7b5359035dfbb1 /arch/mips/oprofile/op_model_mipsxx.c | |
| parent | MIPS: Add defs & probing of [X]ContextConfig (diff) | |
| download | linux-30228c40f0c6f0a93910325f120904505a4c39cc.tar.xz linux-30228c40f0c6f0a93910325f120904505a4c39cc.zip | |
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/op_model_mipsxx.c')
| -rw-r--r-- | arch/mips/oprofile/op_model_mipsxx.c | 4 |
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; |