Parse device tree to detect supported nest pmu units. Traverse
through each nest pmu unit folder to find supported events and
corresponding unit/scale files (if any).
Nest unit event file from DT, will contain the offset in the reserves memory
region to get the counter data for a gievn event. Kernel code uses the same
as event configuration value.
Device tree parser code also look for scale/unit in the file name and
pass on the file as an event attr for perf tool to use in the post
processing.
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 | 129 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 128 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c
index e993630..43d5fde 100644
--- a/arch/powerpc/perf/nest-pmu.c
+++ b/arch/powerpc/perf/nest-pmu.c
@@ -11,6 +11,124 @@
#include "nest-pmu.h"
static struct perchip_nest_info p8_perchip_nest_info[P8_MAX_CHIP];
+static struct nest_pmu *per_nest_pmu_arr[P8_MAX_NEST_PMUS];
+
+static int nest_pmu_create(struct device_node *dev, int pmu_index)
+{
+ struct ppc64_nest_ima_events **p8_events_arr, *p8_events;
+ struct nest_pmu *pmu_ptr;
+ struct property *pp;
+ char *buf, *start;
+ const __be32 *lval;
+ u32 val;
+ int idx = 0;
+
+ if (!dev)
+ return -EINVAL;
+
+ pmu_ptr = kzalloc(sizeof(struct nest_pmu), GFP_KERNEL);
+ if (!pmu_ptr)
+ return -ENOMEM;
+
+ /* Needed for hotplug/migration */
+ per_nest_pmu_arr[pmu_index] = pmu_ptr;
+
+ p8_events_arr = kzalloc((sizeof(struct ppc64_nest_ima_events) * 64),
+ GFP_KERNEL);
+ if (!p8_events_arr)
+ return -ENOMEM;
+ p8_events = (struct ppc64_nest_ima_events *)p8_events_arr;
+
+ /*
+ * Loop through each property
+ */
+ for_each_property_of_node(dev, pp) {
+ start = pp->name;
+
+ if (!strcmp(pp->name, "name")) {
+ if (!pp->value ||
+ (strnlen(pp->value, pp->length) == pp->length))
+ return -EINVAL;
+
+ buf = kzalloc(MAX_PMU_NAME_LEN, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ /* Save the name to register the PMU with it */
+ sprintf(buf, "Nest_%s", (char *)pp->value);
+ pmu_ptr->pmu.name = (char *)buf;
+ }
+
+ /* Skip these, we dont need it */
+ if (!strcmp(pp->name, "name") ||
+ !strcmp(pp->name, "phandle") ||
+ !strcmp(pp->name, "device_type") ||
+ !strcmp(pp->name, "linux,phandle"))
+ continue;
+
+ buf = kzalloc(MAX_PMU_NAME_LEN, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (strncmp(pp->name, "unit.", 5) == 0) {
+ start += 5;
+ strncpy(buf, start, strlen(start));
+ p8_events->ev_name = buf;
+
+ if (!pp->value ||
+ (strnlen(pp->value, pp->length) == pp->length))
+ return -EINVAL;
+
+ buf = kzalloc(MAX_PMU_NAME_LEN, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ strncpy(buf, (const char *)pp->value, pp->length);
+ p8_events->ev_value = buf;
+ idx++;
+ p8_events++;
+
+ } else if (strncmp(pp->name, "scale.", 6) == 0) {
+ start += 6;
+ strncpy(buf, start, strlen(start));
+ p8_events->ev_name = buf;
+
+ if (!pp->value ||
+ (strnlen(pp->value, pp->length) == pp->length))
+ return -EINVAL;
+
+ buf = kzalloc(MAX_PMU_NAME_LEN, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ strncpy(buf, (const char *)pp->value, pp->length);
+ p8_events->ev_value = buf;
+ idx++;
+ p8_events++;
+
+ } else {
+ strncpy(buf, start, strlen(start));
+ p8_events->ev_name = buf;
+ lval = of_get_property(dev, pp->name, NULL);
+ val = (uint32_t)be32_to_cpup(lval);
+
+ /*
+ * Use DT property value as the event
+ */
+ buf = kzalloc(MAX_PMU_NAME_LEN, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ sprintf(buf, "event=0x%x", val);
+ p8_events->ev_value = buf;
+ p8_events++;
+ idx++;
+ }
+ }
+
+ return 0;
+}
+
static int nest_ima_dt_parser(void)
{
@@ -18,7 +136,7 @@ static int nest_ima_dt_parser(void)
const __be64 *chip_ima_reg;
const __be64 *chip_ima_size;
struct device_node *dev;
- int idx;
+ int idx, ret;
/*
* "nest-ima" folder contains two things,
@@ -43,6 +161,15 @@ static int nest_ima_dt_parser(void)
phys_to_virt(p8_perchip_nest_info[idx].pbase);
}
+ /* Look for supported Nest PMU units */
+ idx = 0;
+ for_each_node_by_type(dev, "nest-ima-unit") {
+ ret = nest_pmu_create(dev, idx);
+ if (ret)
+ return ret;
+ idx++;
+ }
+
return 0;
}
--
1.9.1
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