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    Subject[PATCH v2 4/8] perf/amd/ibs: Advertise zen4_ibs_extensions as pmu capability attribute
    Date
    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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