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perf: arm_cspmu: Support implementation specific filters

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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@os.amperecomputing.com>
Reviewed-by: Besar Wicaksono <bwicaksono@nvidia.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230913233941.9814-3-ilkka@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ilkka Koskinen 2023-09-13 16:39:39 -07:00 committed by Will Deacon
parent 8c282414ca
commit 0a7603ab24
2 changed files with 11 additions and 4 deletions
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12
drivers/perf/arm_cspmu/arm_cspmu.c
View File

@ -116,6 +116,9 @@ 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);
static struct acpi_apmt_node *arm_cspmu_apmt_node(struct device *dev)
{
return *(struct acpi_apmt_node **)dev_get_platdata(dev);
@ -454,6 +457,7 @@ 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;
}
@ -815,9 +819,9 @@ 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,
struct hw_perf_event *hwc,
u32 filter)
static void arm_cspmu_set_ev_filter(struct arm_cspmu *cspmu,
struct hw_perf_event *hwc,
u32 filter)
{
u32 offset = PMEVFILTR + (4 * hwc->idx);
@ -849,7 +853,7 @@ 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;

3
drivers/perf/arm_cspmu/arm_cspmu.h
View File

@ -104,6 +104,9 @@ 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);