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MIPS: Add perf counter feature

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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>
This commit is contained in:
James Hogan
2016-05-11 13:50:53 +01:00
committed by Ralf Baechle
parent f18bdfa191
commit 30228c40f0
5 changed files with 9 additions and 6 deletions
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4
arch/mips/oprofile/op_model_mipsxx.c
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@@ -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;