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authorPeter Zijlstra <peterz@infradead.org>2021-06-22 16:21:01 +0200
committerPeter Zijlstra <peterz@infradead.org>2021-06-23 18:30:56 +0200
commit012669c740e6e2afa8bdb95394d06676f933dd2d (patch)
treede93710750d6a1ce1b4480ceb1730c0e16c5bb4f /kernel/events
parentperf/x86/intel: Fix instructions:ppp support in Sapphire Rapids (diff)
downloadlinux-012669c740e6e2afa8bdb95394d06676f933dd2d.tar.xz
linux-012669c740e6e2afa8bdb95394d06676f933dd2d.zip
perf: Fix task context PMU for Hetero
On HETEROGENEOUS hardware (ARM big.Little, Intel Alderlake etc.) each CPU might have a different hardware PMU. Since each such PMU is represented by a different struct pmu, but we only have a single HW task context. That means that the task context needs to switch PMU type when it switches CPUs. Not doing this means that ctx->pmu calls (pmu_{dis,en}able(), {start,commit,cancel}_txn() etc.) are called against the wrong PMU and things will go wobbly. Fixes: f83d2f91d259 ("perf/x86/intel: Add Alder Lake Hybrid support") Reported-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Kan Liang <kan.liang@linux.intel.com> Link: https://lkml.kernel.org/r/YMsy7BuGT8nBTspT@hirez.programming.kicks-ass.net
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 6c964dee2cd7..0e125ae2fa92 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3822,9 +3822,16 @@ static void perf_event_context_sched_in(struct perf_event_context *ctx,
struct task_struct *task)
{
struct perf_cpu_context *cpuctx;
- struct pmu *pmu = ctx->pmu;
+ struct pmu *pmu;
cpuctx = __get_cpu_context(ctx);
+
+ /*
+ * HACK: for HETEROGENEOUS the task context might have switched to a
+ * different PMU, force (re)set the context,
+ */
+ pmu = ctx->pmu = cpuctx->ctx.pmu;
+
if (cpuctx->task_ctx == ctx) {
if (cpuctx->sched_cb_usage)
__perf_pmu_sched_task(cpuctx, true);