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Subject[PATCH 1/2] powerpc/perf/hv-24x7: Fix usage with chip events
From 9b5848ce1834a4d82fc251022035d36d9e26b500 Mon Sep 17 00:00:00 2001
From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Date: Sat, 23 Jan 2016 03:58:12 -0500
Subject: [PATCH 1/2] powerpc/perf/hv-24x7: Fix usage with chip events.

24x7 counters can belong to different domains (core, chip, virtual CPU
etc). For events in the 'chip' domain, sysfs entry currently looks like:

$ cd /sys/bus/event_source/devices/hv_24x7/events
$ cat PM_XLINK_CYCLES__PHYS_CHIP
domain=0x1,offset=0x230,core=?,lpar=0x0

where the required parameter, 'core=?' is specified with perf as:

perf stat -C 0 -e hv_24x7/PM_XLINK_CYCLES__PHYS_CHIP,core=1/ \
/bin/true

This is inconsistent in that 'core' is a required parameter for a chip
event. Instead, have the the sysfs entry display 'chip=?' for chip
events:

$ cd /sys/bus/event_source/devices/hv_24x7/events
$ cat PM_XLINK_CYCLES__PHYS_CHIP
domain=0x1,offset=0x230,chip=?,lpar=0x0

We also need to add a 'chip' entry in the sysfs format directory:

$ ls /sys/bus/event_source/devices/hv_24x7/format
chip core domain lpar offset vcpu
^^^^
(new)

so the perf tool can automatically check usage and format the chip
parameter correctly:

$ perf stat -C 0 -v -e hv_24x7/PM_XLINK_CYCLES__PHYS_CHIP/ \
/bin/true
Required parameter 'chip' not specified
invalid or unsupported event: 'hv_24x7/PM_XLINK_CYCLES__PHYS_CHIP/'

$ perf stat -C 0 -v -e hv_24x7/PM_XLINK_CYCLES__PHYS_CHIP,chip=1/ \
/bin/true
hv_24x7/PM_XLINK_CYCLES__PHYS_CHIP,chip=1/: 0 6628908 6628908

Performance counter stats for 'CPU(s) 0':

0 hv_24x7/PM_XLINK_CYCLES__PHYS_CHIP,chip=1/

0.006606970 seconds time elapsed

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
arch/powerpc/perf/hv-24x7.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 9f9dfda..b7a9a03 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -101,6 +101,7 @@ static bool catalog_entry_domain_is_valid(unsigned domain)
EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3);
/* u16 */
EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31);
+EVENT_DEFINE_RANGE_FORMAT(chip, config, 16, 31);
EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31);
/* u32, see "data_offset" */
EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63);
@@ -115,6 +116,7 @@ static struct attribute *format_attrs[] = {
&format_attr_domain.attr,
&format_attr_offset.attr,
&format_attr_core.attr,
+ &format_attr_chip.attr,
&format_attr_vcpu.attr,
&format_attr_lpar.attr,
NULL,
@@ -289,10 +291,16 @@ static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain)
const char *sindex;
const char *lpar;

- if (is_physical_domain(domain)) {
+ switch (domain) {
+ case HV_PERF_DOMAIN_PHYS_CHIP:
+ lpar = "0x0";
+ sindex = "chip";
+ break;
+ case HV_PERF_DOMAIN_PHYS_CORE:
lpar = "0x0";
sindex = "core";
- } else {
+ break;
+ default:
lpar = "?";
sindex = "vcpu";
}
@@ -1089,10 +1097,16 @@ static int add_event_to_24x7_request(struct perf_event *event,
return -EINVAL;
}

- if (is_physical_domain(event_get_domain(event)))
+ switch (event_get_domain(event)) {
+ case HV_PERF_DOMAIN_PHYS_CHIP:
+ idx = event_get_chip(event);
+ break;
+ case HV_PERF_DOMAIN_PHYS_CORE:
idx = event_get_core(event);
- else
+ break;
+ default:
idx = event_get_vcpu(event);
+ }

i = request_buffer->num_requests++;
req = &request_buffer->requests[i];
--
2.5.3
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