[tip: perf/core] perf/amd/ibs: Advertise remote socket capability

[tip-bot2 for Ravi Bangoria]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     65772b382a9865a5480ee527f3fa6e606fafc0e7
Gitweb:        https://git.kernel.org/tip/65772b382a9865a5480ee527f3fa6e606fafc0e7
Author:        Ravi Bangoria <ravi.bangoria@xxxxxxx>
AuthorDate:    Mon, 16 Feb 2026 04:25:30 
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Fri, 27 Feb 2026 16:40:25 +01:00

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@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260216042530.1546-8-ravi.bangoria@xxxxxxx
---
 arch/x86/events/amd/ibs.c      | 19 +++++++++++++++++++
 arch/x86/include/asm/amd/ibs.h |  3 ++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 0a8313e..eeb607b 100644
--- 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)
@@ -750,6 +751,12 @@ ibs_op_strmst_is_visible(struct kobject *kobj, struct attribute *attr, int i)
 }
 
 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)
 {
 	return ibs_caps & IBS_CAPS_OPLDLAT ? attr->mode : 0;
@@ -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 020916e..4eac36c 100644
--- 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 */
 	};
 };