Add code to create event attribute and attribute group for
each nest pmu.
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: Sukadev Bhattiprolu <suka...@linux.vnet.ibm.com>
Cc: Anshuman Khandual <khand...@linux.vnet.ibm.com>
Cc: Stephane Eranian <eran...@google.com>
Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>
---
arch/powerpc/perf/nest-pmu.c | 55 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c
index 43d5fde..8fad2d9 100644
--- a/arch/powerpc/perf/nest-pmu.c
+++ b/arch/powerpc/perf/nest-pmu.c
@@ -13,6 +13,55 @@
static struct perchip_nest_info p8_perchip_nest_info[P8_MAX_CHIP];
static struct nest_pmu *per_nest_pmu_arr[P8_MAX_NEST_PMUS];
+/*
+ * Populate event name and string in attribute
+ */
+struct attribute *dev_str_attr(const char *name, const char *str)
+{
+ struct perf_pmu_events_attr *attr;
+
+ attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+
+ attr->event_str = str;
+ attr->attr.attr.name = name;
+ attr->attr.attr.mode = 0444;
+ attr->attr.show = perf_event_sysfs_show;
+
+ return &attr->attr.attr;
+}
+
+int update_events_in_group(
+ struct ppc64_nest_ima_events *p8_events, int idx,
+ struct nest_pmu *pmu)
+{
+ struct attribute_group *attr_group;
+ struct attribute **attrs;
+ int i;
+
+ /* Allocate memory add supported event as event attribute */
+ attr_group = kzalloc(((sizeof(struct attribute *) * (idx + 1)) +
+ sizeof(*attr_group)), GFP_KERNEL);
+ if (!attr_group)
+ return -ENOMEM;
+
+ attrs = (struct attribute **)(attr_group + 1);
+ attr_group->name = "events";
+
+ /*
+ * struct attribute group contains, "name" and an
+ * array of attributes, along other elemsnts.
+ * link attrs with attribute group's attr array.
+ */
+ attr_group->attrs = attrs;
+
+ for (i = 0; i < idx; i++, p8_events++)
+ attrs[i] = dev_str_attr((char *)p8_events->ev_name,
+ (char *)p8_events->ev_value);
+
+ pmu->attr_groups[0] = attr_group;
+ return 0;
+}
+
static int nest_pmu_create(struct device_node *dev, int pmu_index)
{
struct ppc64_nest_ima_events **p8_events_arr, *p8_events;
@@ -68,7 +117,7 @@ static int nest_pmu_create(struct device_node *dev, int
pmu_index)
buf = kzalloc(MAX_PMU_NAME_LEN, GFP_KERNEL);
if (!buf)
- return -ENOMEM;
+ return -ENOMEM;
if (strncmp(pp->name, "unit.", 5) == 0) {
start += 5;
@@ -126,6 +175,10 @@ static int nest_pmu_create(struct device_node *dev, int
pmu_index)
}
}
+ update_events_in_group(
+ (struct ppc64_nest_ima_events *)p8_events_arr,
+ idx, pmu_ptr);
+
return 0;
}
--
1.9.1
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