leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

perf/amd/ibs: Advertise zen4_ibs_extensions as pmu capability attribute

Browse Source 
PMU driver can advertise certain feature via capability attribute('caps'
sysfs directory) which can be consumed by userspace tools like perf. Add
zen4_ibs_extensions capability attribute for IBS pmus. This attribute
will be enabled when CPUID_Fn8000001B_EAX[11] is set.

With patch on Zen4:

  $ ls /sys/bus/event_source/devices/ibs_op/caps
  zen4_ibs_extensions

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220509044914.1473-5-ravi.bangoria@amd.com
This commit is contained in:
Ravi Bangoria 2022-05-09 10:19:10 +05:30 committed by Peter Zijlstra
parent ba5d35b442
commit 838de1d843
1 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/x86/events/amd/ibs.c
View File

@ -537,8 +537,14 @@ static struct attribute_group empty_format_group = {
.attrs = attrs_empty,
};
static struct attribute_group empty_caps_group = {
.name = "caps",
.attrs = attrs_empty,
};
static const struct attribute_group *empty_attr_groups[] = {
&empty_format_group,
&empty_caps_group,
NULL,
};
@ -546,6 +552,7 @@ PMU_FORMAT_ATTR(rand_en, "config:57");
PMU_FORMAT_ATTR(cnt_ctl, "config:19");
PMU_EVENT_ATTR_STRING(l3missonly, fetch_l3missonly, "config:59");
PMU_EVENT_ATTR_STRING(l3missonly, op_l3missonly, "config:16");
PMU_EVENT_ATTR_STRING(zen4_ibs_extensions, zen4_ibs_extensions, "1");
static umode_t
zen4_ibs_extensions_is_visible(struct kobject *kobj, struct attribute *attr, int i)
@ -563,6 +570,11 @@ static struct attribute *fetch_l3missonly_attrs[] = {
NULL,
};
static struct attribute *zen4_ibs_extensions_attrs[] = {
&zen4_ibs_extensions.attr.attr,
NULL,
};
static struct attribute_group group_rand_en = {
.name = "format",
.attrs = rand_en_attrs,
@ -574,13 +586,21 @@ static struct attribute_group group_fetch_l3missonly = {
.is_visible = zen4_ibs_extensions_is_visible,
};
static struct attribute_group group_zen4_ibs_extensions = {
.name = "caps",
.attrs = zen4_ibs_extensions_attrs,
.is_visible = zen4_ibs_extensions_is_visible,
};
static const struct attribute_group *fetch_attr_groups[] = {
&group_rand_en,
&empty_caps_group,
NULL,
};
static const struct attribute_group *fetch_attr_update[] = {
&group_fetch_l3missonly,
&group_zen4_ibs_extensions,
NULL,
};
@ -615,6 +635,7 @@ static struct attribute_group group_op_l3missonly = {
static const struct attribute_group *op_attr_update[] = {
&group_cnt_ctl,
&group_op_l3missonly,
&group_zen4_ibs_extensions,
NULL,
};