perf/x86/intel: Add a quirk for the calculation of the number of counters on Alder...

For some Alder Lake machine with all E-cores disabled in a BIOS, the
below warning may be triggered.

[ 2.010766] hw perf events fixed 5 > max(4), clipping!

Current perf code relies on the CPUID leaf 0xA and leaf 7.EDX[15] to
calculate the number of the counters and follow the below assumption.

For a hybrid configuration, the leaf 7.EDX[15] (X86_FEATURE_HYBRID_CPU)
is set. The leaf 0xA only enumerate the common counters. Linux perf has
to manually add the extra GP counters and fixed counters for P-cores.
For a non-hybrid configuration, the X86_FEATURE_HYBRID_CPU should not
be set. The leaf 0xA enumerates all counters.

However, that's not the case when all E-cores are disabled in a BIOS.
Although there are only P-cores in the system, the leaf 7.EDX[15]
(X86_FEATURE_HYBRID_CPU) is still set. But the leaf 0xA is updated
to enumerate all counters of P-cores. The inconsistency triggers the
warning.

Several software ways were considered to handle the inconsistency.
- Drop the leaf 0xA and leaf 7.EDX[15] CPUID enumeration support.
  Hardcode the number of counters. This solution may be a problem for
  virtualization. A hypervisor cannot control the number of counters
  in a Linux guest via changing the guest CPUID enumeration anymore.
- Find another CPUID bit that is also updated with E-cores disabled.
  There may be a problem in the virtualization environment too. Because
  a hypervisor may disable the feature/CPUID bit.
- The P-cores have a maximum of 8 GP counters and 4 fixed counters on
  ADL. The maximum number can be used to detect the case.
  This solution is implemented in this patch.

Fixes: ee72a94ea4a6 ("perf/x86/intel: Fix fixed counter check warning for some Alder Lake")
Reported-by: Damjan Marion (damarion) <damarion@cisco.com>
Reported-by: Chan Edison <edison_chan_gz@hotmail.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Damjan Marion (damarion) <damarion@cisco.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1641925238-149288-1-git-send-email-kan.liang@linux.intel.com

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index fd9f908..d5f940c 100644 (file)
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -6236,6 +6236,19 @@ __init int intel_pmu_init(void)
                        pmu->num_counters = x86_pmu.num_counters;
                        pmu->num_counters_fixed = x86_pmu.num_counters_fixed;
                }
+
+               /*
+                * Quirk: For some Alder Lake machine, when all E-cores are disabled in
+                * a BIOS, the leaf 0xA will enumerate all counters of P-cores. However,
+                * the X86_FEATURE_HYBRID_CPU is still set. The above codes will
+                * mistakenly add extra counters for P-cores. Correct the number of
+                * counters here.
+                */
+               if ((pmu->num_counters > 8) || (pmu->num_counters_fixed > 4)) {
+                       pmu->num_counters = x86_pmu.num_counters;
+                       pmu->num_counters_fixed = x86_pmu.num_counters_fixed;
+               }
+
                pmu->max_pebs_events = min_t(unsigned, MAX_PEBS_EVENTS, pmu->num_counters);
                pmu->unconstrained = (struct event_constraint)
                                        __EVENT_CONSTRAINT(0, (1ULL << pmu->num_counters) - 1,