From 6de0298a3925f1e6e313430c45ae314a93f89ef6 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Wed, 5 Mar 2025 16:10:07 +0000 Subject: [PATCH] perf/arm_cspmu: Generalise event filtering The notion of a single u32 filter value for any event doesn't scale well when the potential architectural scope is already two 64-bit values, and implementations may add custom stuff on the side too. Rather than try to thread arbitrary filter data through the common path, let's just make the set_ev_filter op self-contained in terms of parsing and configuring any and all filtering for the given event - splitting out a distinct op for cycles events which inherently differ - and let implementations override the whole thing if they want to do something different. This already allows the Ampere code to stop looking a bit hacky. Signed-off-by: Robin Murphy Reviewed-by: James Clark Reviewed-by: Ilkka Koskinen Link: https://lore.kernel.org/r/c0cd4d4c12566dbf1b062ccd60241b3e0639f4cc.1741190362.git.robin.murphy@arm.com Signed-off-by: Will Deacon --- drivers/perf/arm_cspmu/ampere_cspmu.c | 24 ++++++---------------- drivers/perf/arm_cspmu/arm_cspmu.c | 29 +++++++++++---------------- drivers/perf/arm_cspmu/arm_cspmu.h | 8 ++++---- drivers/perf/arm_cspmu/nvidia_cspmu.c | 21 ++++++++++++++++++- 4 files changed, 42 insertions(+), 40 deletions(-) diff --git a/drivers/perf/arm_cspmu/ampere_cspmu.c b/drivers/perf/arm_cspmu/ampere_cspmu.c index 31cc1a4ac9df1..b8ca69fd9d1d2 100644 --- a/drivers/perf/arm_cspmu/ampere_cspmu.c +++ b/drivers/perf/arm_cspmu/ampere_cspmu.c @@ -132,32 +132,20 @@ ampere_cspmu_get_name(const struct arm_cspmu *cspmu) return ctx->name; } -static u32 ampere_cspmu_event_filter(const struct perf_event *event) +static void ampere_cspmu_set_cc_filter(struct arm_cspmu *cspmu, + const struct perf_event *event) { /* - * PMEVFILTR or PMCCFILTR aren't used in Ampere SoC PMU but are marked - * as RES0. Make sure, PMCCFILTR is written zero. + * PMCCFILTR is RES0, so this is just a dummy callback to override + * the default implementation and avoid writing to it. */ - return 0; } static void ampere_cspmu_set_ev_filter(struct arm_cspmu *cspmu, - struct hw_perf_event *hwc, - u32 filter) + const struct perf_event *event) { - struct perf_event *event; - unsigned int idx; u32 threshold, rank, bank; - /* - * At this point, all the events have the same filter settings. - * Therefore, take the first event and use its configuration. - */ - idx = find_first_bit(cspmu->hw_events.used_ctrs, - cspmu->cycle_counter_logical_idx); - - event = cspmu->hw_events.events[idx]; - threshold = get_threshold(event); rank = get_rank(event); bank = get_bank(event); @@ -233,7 +221,7 @@ static int ampere_cspmu_init_ops(struct arm_cspmu *cspmu) cspmu->impl.ctx = ctx; - impl_ops->event_filter = ampere_cspmu_event_filter; + impl_ops->set_cc_filter = ampere_cspmu_set_cc_filter; impl_ops->set_ev_filter = ampere_cspmu_set_ev_filter; impl_ops->validate_event = ampere_cspmu_validate_event; impl_ops->get_name = ampere_cspmu_get_name; diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c index 769466d55bea2..053bb7920df6e 100644 --- a/drivers/perf/arm_cspmu/arm_cspmu.c +++ b/drivers/perf/arm_cspmu/arm_cspmu.c @@ -66,7 +66,9 @@ static unsigned long arm_cspmu_cpuhp_state; static DEFINE_MUTEX(arm_cspmu_lock); static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu, - struct hw_perf_event *hwc, u32 filter); + const struct perf_event *event); +static void arm_cspmu_set_cc_filter(struct arm_cspmu *cspmu, + const struct perf_event *event); static struct acpi_apmt_node *arm_cspmu_apmt_node(struct device *dev) { @@ -205,11 +207,6 @@ static bool arm_cspmu_is_cycle_counter_event(const struct perf_event *event) return (event->attr.config == ARM_CSPMU_EVT_CYCLES_DEFAULT); } -static u32 arm_cspmu_event_filter(const struct perf_event *event) -{ - return event->attr.config1 & ARM_CSPMU_FILTER_MASK; -} - static ssize_t arm_cspmu_identifier_show(struct device *dev, struct device_attribute *attr, char *page) @@ -371,7 +368,7 @@ static int arm_cspmu_init_impl_ops(struct arm_cspmu *cspmu) DEFAULT_IMPL_OP(get_name), DEFAULT_IMPL_OP(is_cycle_counter_event), DEFAULT_IMPL_OP(event_type), - DEFAULT_IMPL_OP(event_filter), + DEFAULT_IMPL_OP(set_cc_filter), DEFAULT_IMPL_OP(set_ev_filter), DEFAULT_IMPL_OP(event_attr_is_visible), }; @@ -767,26 +764,26 @@ static inline void arm_cspmu_set_event(struct arm_cspmu *cspmu, } static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu, - struct hw_perf_event *hwc, - u32 filter) + const struct perf_event *event) { + u32 filter = event->attr.config1 & ARM_CSPMU_FILTER_MASK; u32 offset = PMEVFILTR + (4 * hwc->idx); writel(filter, cspmu->base0 + offset); } -static inline void arm_cspmu_set_cc_filter(struct arm_cspmu *cspmu, u32 filter) +static void arm_cspmu_set_cc_filter(struct arm_cspmu *cspmu, + const struct perf_event *event) { - u32 offset = PMCCFILTR; + u32 filter = event->attr.config1 & ARM_CSPMU_FILTER_MASK; - writel(filter, cspmu->base0 + offset); + writel(filter, cspmu->base0 + PMCCFILTR); } static void arm_cspmu_start(struct perf_event *event, int pmu_flags) { struct arm_cspmu *cspmu = to_arm_cspmu(event->pmu); struct hw_perf_event *hwc = &event->hw; - u32 filter; /* We always reprogram the counter */ if (pmu_flags & PERF_EF_RELOAD) @@ -794,13 +791,11 @@ static void arm_cspmu_start(struct perf_event *event, int pmu_flags) arm_cspmu_set_event_period(event); - filter = cspmu->impl.ops.event_filter(event); - if (event->hw.extra_reg.idx == cspmu->cycle_counter_logical_idx) { - arm_cspmu_set_cc_filter(cspmu, filter); + cspmu->impl.ops.set_cc_filter(cspmu, event); } else { arm_cspmu_set_event(cspmu, hwc); - cspmu->impl.ops.set_ev_filter(cspmu, hwc, filter); + cspmu->impl.ops.set_ev_filter(cspmu, event); } hwc->state = 0; diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h index 576249e0deeae..d59040d6a7e39 100644 --- a/drivers/perf/arm_cspmu/arm_cspmu.h +++ b/drivers/perf/arm_cspmu/arm_cspmu.h @@ -149,11 +149,11 @@ struct arm_cspmu_impl_ops { bool (*is_cycle_counter_event)(const struct perf_event *event); /* Decode event type/id from configs */ u32 (*event_type)(const struct perf_event *event); - /* Decode filter value from configs */ - u32 (*event_filter)(const struct perf_event *event); - /* Set event filter */ + /* Set event filters */ + void (*set_cc_filter)(struct arm_cspmu *cspmu, + const struct perf_event *event); void (*set_ev_filter)(struct arm_cspmu *cspmu, - struct hw_perf_event *hwc, u32 filter); + const struct perf_event *event); /* Implementation specific event validation */ int (*validate_event)(struct arm_cspmu *cspmu, struct perf_event *event); diff --git a/drivers/perf/arm_cspmu/nvidia_cspmu.c b/drivers/perf/arm_cspmu/nvidia_cspmu.c index 8116c7846a466..9e817f120828f 100644 --- a/drivers/perf/arm_cspmu/nvidia_cspmu.c +++ b/drivers/perf/arm_cspmu/nvidia_cspmu.c @@ -183,6 +183,24 @@ static u32 nv_cspmu_event_filter(const struct perf_event *event) return filter_val; } +static void nv_cspmu_set_ev_filter(struct arm_cspmu *cspmu, + const struct perf_event *event) +{ + u32 filter = nv_cspmu_event_filter(event); + u32 offset = PMEVFILTR + (4 * event->hw.idx); + + writel(filter, cspmu->base0 + offset); +} + +static void nv_cspmu_set_cc_filter(struct arm_cspmu *cspmu, + const struct perf_event *event) +{ + u32 filter = nv_cspmu_event_filter(event); + + writel(filter, cspmu->base0 + PMCCFILTR); +} + + enum nv_cspmu_name_fmt { NAME_FMT_GENERIC, NAME_FMT_SOCKET @@ -322,7 +340,8 @@ static int nv_cspmu_init_ops(struct arm_cspmu *cspmu) cspmu->impl.ctx = ctx; /* NVIDIA specific callbacks. */ - impl_ops->event_filter = nv_cspmu_event_filter; + impl_ops->set_cc_filter = nv_cspmu_set_cc_filter; + impl_ops->set_ev_filter = nv_cspmu_set_ev_filter; impl_ops->get_event_attrs = nv_cspmu_get_event_attrs; impl_ops->get_format_attrs = nv_cspmu_get_format_attrs; impl_ops->get_name = nv_cspmu_get_name;