perf: arm_cspmu: Support implementation specific filters

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>

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index 5f4f04135a22d95046adef60cbc7467fc7a9812c..2ecbf8d7714b1d07ab3f1649b72fcfac01bd93fc 100644 (file)
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -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;

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.h b/drivers/perf/arm_cspmu/arm_cspmu.h
index 7936a90ded7fe3abaf94b8d17d5e6e061b212a6a..e0cca5b4aab97cf5ba4db7997a790e702fca63fd 100644 (file)
--- a/drivers/perf/arm_cspmu/arm_cspmu.h
+++ b/drivers/perf/arm_cspmu/arm_cspmu.h
@@ -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);