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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
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/kernel/cpu-probe.c
View File

@@ -648,6 +648,8 @@ static inline unsigned int decode_config1(struct cpuinfo_mips *c)
if (config1 & MIPS_CONF1_MD)
c->ases |= MIPS_ASE_MDMX;
if (config1 & MIPS_CONF1_PC)
c->options |= MIPS_CPU_PERF;
if (config1 & MIPS_CONF1_WR)
c->options |= MIPS_CPU_WATCH;
if (config1 & MIPS_CONF1_CA)

4
arch/mips/kernel/perf_event_mipsxx.c
View File

@@ -101,8 +101,6 @@ struct mips_pmu {
static struct mips_pmu mipspmu;
#define M_CONFIG1_PC (1 << 4)
#define M_PERFCTL_EXL (1 << 0)
#define M_PERFCTL_KERNEL (1 << 1)
#define M_PERFCTL_SUPERVISOR (1 << 2)
@@ -754,7 +752,7 @@ static void handle_associated_event(struct cpu_hw_events *cpuc,
static 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;