perf/amd/ibs: Advertise remote socket capability

IBS OP on future hardware can indicate data source from remote socket
as well. Advertise this capability to userspace so that userspace tools
can decode IBS data accordingly.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260216042530.1546-8-ravi.bangoria@amd.com

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 0a8313ea6331ac2c9bae9a93e8117d07e3de541b..eeb607b84ddaec3502bc3b738dadefbbbd979a61 100644 (file)
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -730,6 +730,7 @@ PMU_EVENT_ATTR_STRING(fetchlat, ibs_fetch_lat_format, "config1:0-10");
 PMU_EVENT_ATTR_STRING(fetchlat, ibs_fetch_lat_cap, "1");
 PMU_EVENT_ATTR_STRING(strmst, ibs_op_strmst_format, "config1:12");
 PMU_EVENT_ATTR_STRING(strmst, ibs_op_strmst_cap, "1");
+PMU_EVENT_ATTR_STRING(rmtsocket, ibs_op_rmtsocket_cap, "1");
 
 static umode_t
 zen4_ibs_extensions_is_visible(struct kobject *kobj, struct attribute *attr, int i)
@@ -749,6 +750,12 @@ ibs_op_strmst_is_visible(struct kobject *kobj, struct attribute *attr, int i)
        return ibs_caps & IBS_CAPS_STRMST_RMTSOCKET ? attr->mode : 0;
 }
 
+static umode_t
+ibs_op_rmtsocket_is_visible(struct kobject *kobj, struct attribute *attr, int i)
+{
+       return ibs_caps & IBS_CAPS_STRMST_RMTSOCKET ? attr->mode : 0;
+}
+
 static umode_t
 ibs_op_ldlat_is_visible(struct kobject *kobj, struct attribute *attr, int i)
 {
@@ -802,6 +809,11 @@ static struct attribute *ibs_op_strmst_cap_attrs[] = {
        NULL,
 };
 
+static struct attribute *ibs_op_rmtsocket_cap_attrs[] = {
+       &ibs_op_rmtsocket_cap.attr.attr,
+       NULL,
+};
+
 static struct attribute_group group_fetch_formats = {
        .name = "format",
        .attrs = fetch_attrs,
@@ -849,6 +861,12 @@ static struct attribute_group group_ibs_op_strmst_cap = {
        .is_visible = ibs_op_strmst_is_visible,
 };
 
+static struct attribute_group group_ibs_op_rmtsocket_cap = {
+       .name = "caps",
+       .attrs = ibs_op_rmtsocket_cap_attrs,
+       .is_visible = ibs_op_rmtsocket_is_visible,
+};
+
 static const struct attribute_group *fetch_attr_groups[] = {
        &group_fetch_formats,
        &empty_caps_group,
@@ -938,6 +956,7 @@ static const struct attribute_group *op_attr_update[] = {
        &group_ibs_op_dtlb_pgsize_cap,
        &group_ibs_op_strmst_cap,
        &group_ibs_op_strmst_format,
+       &group_ibs_op_rmtsocket_cap,
        NULL,
 };
 

diff --git a/arch/x86/include/asm/amd/ibs.h b/arch/x86/include/asm/amd/ibs.h
index 020916eb7b4e9204f28df07964637a7cdc87bc19..4eac36c42db6647612781f9c33f3b4724cdcd30f 100644 (file)
--- a/arch/x86/include/asm/amd/ibs.h
+++ b/arch/x86/include/asm/amd/ibs.h
@@ -100,7 +100,8 @@ union ibs_op_data2 {
                        cache_hit_st:1, /* 5: cache hit state */
                        data_src_hi:2,  /* 6-7: data source high */
                        strm_st:1,      /* 8: streaming store */
-                       reserved1:55;   /* 9-63: reserved */
+                       rmt_socket:1,   /* 9: remote socket */
+                       reserved1:54;   /* 10-63: reserved */
        };
 };