Add set of generic nest pmu related event functions to be used by
each nest pmu. Add code to setup format attribute and to register
nest pmus.
Cc: Michael Ellerman <m...@ellerman.id.au>
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Anton Blanchard <an...@samba.org>
Cc: Daniel Axtens <d...@axtens.net>
Cc: Stephane Eranian <eran...@google.com>
Cc: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>
---
arch/powerpc/perf/nest-pmu.c | 114 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c
index b9b44147c9b8..772e4d2d7a04 100644
--- a/arch/powerpc/perf/nest-pmu.c
+++ b/arch/powerpc/perf/nest-pmu.c
@@ -13,6 +13,111 @@
struct perchip_nest_info nest_perchip_info[NEST_MAX_CHIPS];
struct nest_pmu *per_nest_pmu_arr[NEST_MAX_PMUS];
+PMU_FORMAT_ATTR(event, "config:0-20");
+static struct attribute *nest_format_attrs[] = {
+ &format_attr_event.attr,
+ NULL,
+};
+
+static struct attribute_group nest_format_group = {
+ .name = "format",
+ .attrs = nest_format_attrs,
+};
+
+static int nest_event_init(struct perf_event *event)
+{
+ int chip_id;
+ u32 config = event->attr.config;
+ struct perchip_nest_info *pcni;
+
+ if (event->attr.type != event->pmu->type)
+ return -ENOENT;
+
+ /* Sampling not supported yet */
+ if (event->hw.sample_period)
+ return -EINVAL;
+
+ /* unsupported modes and filters */
+ if (event->attr.exclude_user ||
+ event->attr.exclude_kernel ||
+ event->attr.exclude_hv ||
+ event->attr.exclude_idle ||
+ event->attr.exclude_host ||
+ event->attr.exclude_guest)
+ return -EINVAL;
+
+ if (event->cpu < 0)
+ return -EINVAL;
+
+ chip_id = topology_physical_package_id(event->cpu);
+ pcni = &nest_perchip_info[chip_id];
+ event->hw.event_base = pcni->vbase[config/PAGE_SIZE] +
+ (config & ~PAGE_MASK );
+
+ return 0;
+}
+
+static void nest_read_counter(struct perf_event *event)
+{
+ u64 *addr, data;
+
+ addr = (u64 *)event->hw.event_base;
+ data = __be64_to_cpu(*addr);
+ local64_set(&event->hw.prev_count, data);
+}
+
+static void nest_perf_event_update(struct perf_event *event)
+{
+ u64 counter_prev, counter_new, final_count, *addr;
+
+ addr = (u64 *)event->hw.event_base;
+ counter_prev = local64_read(&event->hw.prev_count);
+ counter_new = __be64_to_cpu(*addr);
+ final_count = counter_new - counter_prev;
+
+ local64_set(&event->hw.prev_count, counter_new);
+ local64_add(final_count, &event->count);
+}
+
+static void nest_event_start(struct perf_event *event, int flags)
+{
+ nest_read_counter(event);
+}
+
+static void nest_event_stop(struct perf_event *event, int flags)
+{
+ if (flags & PERF_EF_UPDATE)
+ nest_perf_event_update(event);
+}
+
+static int nest_event_add(struct perf_event *event, int flags)
+{
+ if (flags & PERF_EF_START)
+ nest_event_start(event, flags);
+
+ return 0;
+}
+
+/*
+ * Populate pmu ops in the structure
+ */
+static int update_pmu_ops(struct nest_pmu *pmu)
+{
+ if (!pmu)
+ return -EINVAL;
+
+ pmu->pmu.task_ctx_nr = perf_invalid_context;
+ pmu->pmu.event_init = nest_event_init;
+ pmu->pmu.add = nest_event_add;
+ pmu->pmu.del = nest_event_stop;
+ pmu->pmu.start = nest_event_start;
+ pmu->pmu.stop = nest_event_stop;
+ pmu->pmu.read = nest_perf_event_update;
+ pmu->attr_groups[1] = &nest_format_group;
+ pmu->pmu.attr_groups = pmu->attr_groups;
+
+ return 0;
+}
/*
* Populate event name and string in attribute
*/
@@ -62,8 +167,17 @@ static int update_events_in_group(
int init_nest_pmu(struct nest_ima_events *nest_events,
int idx, struct nest_pmu *pmu_ptr)
{
+ int ret = -ENODEV;
update_events_in_group(nest_events, idx, pmu_ptr);
+ update_pmu_ops(pmu_ptr);
+
+ ret = perf_pmu_register(&pmu_ptr->pmu, pmu_ptr->pmu.name, -1);
+ if (ret)
+ return ret;
+
+ pr_info("%s performance monitor hardware support registered\n",
+ pmu_ptr->pmu.name);
return 0;
}
--
1.9.1
