Messages in this thread Patch in this message | | | From | Ravi Bangoria <> | Subject | [PATCH v2 4/8] perf/amd/ibs: Advertise zen4_ibs_extensions as pmu capability attribute | Date | Mon, 9 May 2022 10:19:10 +0530 |
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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> --- arch/x86/events/amd/ibs.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index 52d2eb9ff19a..12b0fd4a0328 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -527,8 +527,14 @@ 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, }; @@ -536,6 +542,7 @@ 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) @@ -553,6 +560,11 @@ 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, @@ -564,13 +576,21 @@ 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, }; @@ -605,6 +625,7 @@ 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, }; -- 2.27.0
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