[PATCH v5 2/4] perf: arm_cspmu: Support implementation specific filters

From: Ilkka Koskinen
Date: Thu Jul 13 2023 - 21:02:46 EST


ARM Coresight PMU architecture specification [1] defines PMEVTYPER and
PMEVFILT* registers as optional in Chapter 2.1. Moreover, implementers may
choose to use PMIMPDEF* registers (offset: 0xD80-> 0xDFF) to filter the
events. Add support for those by adding implementation specific filter
callback function.

[1] https://developer.arm.com/documentation/ihi0091/latest

Signed-off-by: Ilkka Koskinen <ilkka@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Besar Wicaksono <bwicaksono@xxxxxxxxxx>
---
drivers/perf/arm_cspmu/arm_cspmu.c | 8 ++++++--
drivers/perf/arm_cspmu/arm_cspmu.h | 3 +++
2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index 0f517152cb4e..fafd734c3218 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -117,6 +117,9 @@

static unsigned long arm_cspmu_cpuhp_state;

+static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
+ struct hw_perf_event *hwc, u32 filter);
+
static struct acpi_apmt_node *arm_cspmu_apmt_node(struct device *dev)
{
return *(struct acpi_apmt_node **)dev_get_platdata(dev);
@@ -426,6 +429,7 @@ static int arm_cspmu_init_impl_ops(struct arm_cspmu *cspmu)
CHECK_DEFAULT_IMPL_OPS(impl_ops, event_type);
CHECK_DEFAULT_IMPL_OPS(impl_ops, event_filter);
CHECK_DEFAULT_IMPL_OPS(impl_ops, event_attr_is_visible);
+ CHECK_DEFAULT_IMPL_OPS(impl_ops, set_ev_filter);

return 0;
}
@@ -792,7 +796,7 @@ static inline void arm_cspmu_set_event(struct arm_cspmu *cspmu,
writel(hwc->config, cspmu->base0 + offset);
}

-static inline void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
+static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
struct hw_perf_event *hwc,
u32 filter)
{
@@ -826,7 +830,7 @@ static void arm_cspmu_start(struct perf_event *event, int pmu_flags)
arm_cspmu_set_cc_filter(cspmu, filter);
} else {
arm_cspmu_set_event(cspmu, hwc);
- arm_cspmu_set_ev_filter(cspmu, hwc, filter);
+ cspmu->impl.ops.set_ev_filter(cspmu, hwc, filter);
}

hwc->state = 0;
diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h
index 83df53d1c132..d6d88c246a23 100644
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -101,6 +101,9 @@ struct arm_cspmu_impl_ops {
u32 (*event_type)(const struct perf_event *event);
/* Decode filter value from configs */
u32 (*event_filter)(const struct perf_event *event);
+ /* Set event filter */
+ void (*set_ev_filter)(struct arm_cspmu *cspmu,
+ struct hw_perf_event *hwc, u32 filter);
/* Hide/show unsupported events */
umode_t (*event_attr_is_visible)(struct kobject *kobj,
struct attribute *attr, int unused);
--
2.40.1