From: Kan Liang kan.liang@linux.intel.com
mainline inclusion from mainline-v5.10-rc1 commit 2cb5383b30d47c446ec7d884cd80f93ffcc31817 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V CVE: NA
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commit 2cb5383b30d47c446ec7d884cd80f93ffcc31817 upstream Backport summary: backport to kernel 4.19.57 for ICX perf topdown support
Starts from Ice Lake, the TopDown metrics are directly available as fixed counters and do not require generic counters. Also, the TopDown metrics can be collected per thread. Extend the RDPMC usage to support per-thread TopDown metrics.
The RDPMC index of the PERF_METRICS will be output if RDPMC users ask for the RDPMC index of the metrics events.
To support per thread RDPMC TopDown, the metrics and slots counters have to be saved/restored during the context switching.
The last_period and period_left are not used in the counting mode. Use the fields for saved_metric and saved_slots.
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/20200723171117.9918-12-kan.liang@linux.intel.com Signed-off-by: Yunying Sun yunying.sun@intel.com Signed-off-by: Jackie Liu liuyun01@kylinos.cn Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Wei Li liwei391@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/x86/events/core.c | 5 +- arch/x86/events/intel/core.c | 90 +++++++++++++++++++++++++++++++----- include/linux/perf_event.h | 29 ++++++++---- 3 files changed, 102 insertions(+), 22 deletions(-)
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 0879a5398dbe..6e2a5ae4608b 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2198,7 +2198,10 @@ static int x86_pmu_event_idx(struct perf_event *event) if (!(hwc->flags & PERF_X86_EVENT_RDPMC_ALLOWED)) return 0;
- return hwc->event_base_rdpmc + 1; + if (is_metric_idx(hwc->idx)) + return INTEL_PMC_FIXED_RDPMC_METRICS + 1; + else + return hwc->event_base_rdpmc + 1; }
static ssize_t get_attr_rdpmc(struct device *cdev, diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index d087b471a002..c10bdf5799d8 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -2236,7 +2236,13 @@ static int icl_set_topdown_event_period(struct perf_event *event) if (left == x86_pmu.max_period) { wrmsrl(MSR_CORE_PERF_FIXED_CTR3, 0); wrmsrl(MSR_PERF_METRICS, 0); - local64_set(&hwc->period_left, 0); + hwc->saved_slots = 0; + hwc->saved_metric = 0; + } + + if ((hwc->saved_slots) && is_slots_event(event)) { + wrmsrl(MSR_CORE_PERF_FIXED_CTR3, hwc->saved_slots); + wrmsrl(MSR_PERF_METRICS, hwc->saved_metric); }
perf_event_update_userpage(event); @@ -2257,7 +2263,7 @@ static inline u64 icl_get_metrics_event_value(u64 metric, u64 slots, int idx) return mul_u64_u32_div(slots, val, 0xff); }
-static void __icl_update_topdown_event(struct perf_event *event, +static u64 icl_get_topdown_value(struct perf_event *event, u64 slots, u64 metrics) { int idx = event->hw.idx; @@ -2268,7 +2274,50 @@ static void __icl_update_topdown_event(struct perf_event *event, else delta = slots;
- local64_add(delta, &event->count); + return delta; +} + +static void __icl_update_topdown_event(struct perf_event *event, + u64 slots, u64 metrics, + u64 last_slots, u64 last_metrics) +{ + u64 delta, last = 0; + + delta = icl_get_topdown_value(event, slots, metrics); + if (last_slots) + last = icl_get_topdown_value(event, last_slots, last_metrics); + + /* + * The 8bit integer fraction of metric may be not accurate, + * especially when the changes is very small. + * For example, if only a few bad_spec happens, the fraction + * may be reduced from 1 to 0. If so, the bad_spec event value + * will be 0 which is definitely less than the last value. + * Avoid update event->count for this case. + */ + if (delta > last) { + delta -= last; + local64_add(delta, &event->count); + } +} + +static void update_saved_topdown_regs(struct perf_event *event, + u64 slots, u64 metrics) +{ + struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + struct perf_event *other; + int idx; + + event->hw.saved_slots = slots; + event->hw.saved_metric = metrics; + + for_each_set_bit(idx, cpuc->active_mask, INTEL_PMC_IDX_TD_BE_BOUND + 1) { + if (!is_topdown_idx(idx)) + continue; + other = cpuc->events[idx]; + other->hw.saved_slots = slots; + other->hw.saved_metric = metrics; + } }
/* @@ -2282,6 +2331,7 @@ static u64 icl_update_topdown_event(struct perf_event *event) struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); struct perf_event *other; u64 slots, metrics; + bool reset = true; int idx;
/* read Fixed counter 3 */ @@ -2296,19 +2346,39 @@ static u64 icl_update_topdown_event(struct perf_event *event) if (!is_topdown_idx(idx)) continue; other = cpuc->events[idx]; - __icl_update_topdown_event(other, slots, metrics); + __icl_update_topdown_event(other, slots, metrics, + event ? event->hw.saved_slots : 0, + event ? event->hw.saved_metric : 0); }
/* * Check and update this event, which may have been cleared * in active_mask e.g. x86_pmu_stop() */ - if (event && !test_bit(event->hw.idx, cpuc->active_mask)) - __icl_update_topdown_event(event, slots, metrics); + if (event && !test_bit(event->hw.idx, cpuc->active_mask)) { + __icl_update_topdown_event(event, slots, metrics, + event->hw.saved_slots, + event->hw.saved_metric);
- /* The fixed counter 3 has to be written before the PERF_METRICS. */ - wrmsrl(MSR_CORE_PERF_FIXED_CTR3, 0); - wrmsrl(MSR_PERF_METRICS, 0); + /* + * In x86_pmu_stop(), the event is cleared in active_mask first, + * then drain the delta, which indicates context switch for + * counting. + * Save metric and slots for context switch. + * Don't need to reset the PERF_METRICS and Fixed counter 3. + * Because the values will be restored in next schedule in. + */ + update_saved_topdown_regs(event, slots, metrics); + reset = false; + } + + if (reset) { + /* The fixed counter 3 has to be written before the PERF_METRICS. */ + wrmsrl(MSR_CORE_PERF_FIXED_CTR3, 0); + wrmsrl(MSR_PERF_METRICS, 0); + if (event) + update_saved_topdown_regs(event, 0, 0); + }
return slots; } @@ -3441,8 +3511,6 @@ static int intel_pmu_hw_config(struct perf_event *event) */ leader->hw.flags |= PERF_X86_EVENT_TOPDOWN; event->hw.flags |= PERF_X86_EVENT_TOPDOWN; - - event->hw.flags &= ~PERF_X86_EVENT_RDPMC_ALLOWED; } }
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 87f465412af4..0550194b3252 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -198,17 +198,26 @@ struct hw_perf_event { */ u64 sample_period;
- /* - * The period we started this sample with. - */ - u64 last_period; + union { + struct { /* Sampling */ + /* + * The period we started this sample with. + */ + u64 last_period;
- /* - * However much is left of the current period; note that this is - * a full 64bit value and allows for generation of periods longer - * than hardware might allow. - */ - local64_t period_left; + /* + * However much is left of the current period; + * note that this is a full 64bit value and + * allows for generation of periods longer + * than hardware might allow. + */ + local64_t period_left; + }; + struct { /* Topdown events counting for context switch */ + u64 saved_metric; + u64 saved_slots; + }; + };
/* * State for throttling the event, see __perf_event_overflow() and