It might be possible that different CPUs have different CPU metrics on a
platform. In this case, writing the GLOBAL_CTRL_EN_PERF_METRICS bit to
the GLOBAL_CTRL register of a CPU, which doesn't support the TopDown
perf metrics feature, causes MSR access error.
Current TopDown perf metrics feature is enumerated using the boot CPU's
PERF_CAPABILITIES MSR. The MSR only indicates the boot CPU supports this
feature.
Check the PERF_CAPABILITIES MSR for each CPU. If any CPU doesn't support
the perf metrics feature, disable the feature globally.
Fixes:
59a854e2f3b9 ("perf/x86/intel: Support TopDown metrics on Ice Lake")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201001211711.25708-1-kan.liang@linux.intel.com
if (x86_pmu.counter_freezing)
enable_counter_freeze();
+ /* Disable perf metrics if any added CPU doesn't support it. */
+ if (x86_pmu.intel_cap.perf_metrics) {
+ union perf_capabilities perf_cap;
+
+ rdmsrl(MSR_IA32_PERF_CAPABILITIES, perf_cap.capabilities);
+ if (!perf_cap.perf_metrics) {
+ x86_pmu.intel_cap.perf_metrics = 0;
+ x86_pmu.intel_ctrl &= ~(1ULL << GLOBAL_CTRL_EN_PERF_METRICS);
+ }
+ }
+
if (!cpuc->shared_regs)
return;