[tip: perf/core] perf/amd/ibs: Define macro for ldlat mask and shift

[tip-bot2 for Ravi Bangoria]

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

Commit-ID:     f9d55ccf0199d1a80c2519084578f0c345dedd2f
Gitweb:        https://git.kernel.org/tip/f9d55ccf0199d1a80c2519084578f0c345dedd2f
Author:        Ravi Bangoria <ravi.bangoria@xxxxxxx>
AuthorDate:    Mon, 16 Feb 2026 04:25:24 
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Fri, 27 Feb 2026 16:40:24 +01:00

perf/amd/ibs: Define macro for ldlat mask and shift

Load latency filter threshold is encoded in config1[11:0]. Define a mask
for it instead of hardcoded 0xFFF. Unlike "config" fields whose layout
maps to PERF_{FETCH|OP}_CTL MSR, layout of "config1" is custom defined
so a new set of macros are needed for "config1" fields.

Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260216042530.1546-2-ravi.bangoria@xxxxxxx
---
 arch/x86/events/amd/ibs.c         | 11 +++++++----
 arch/x86/include/asm/perf_event.h |  1 +
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 32e6456..2e8fb06 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -32,6 +32,9 @@ static u32 ibs_caps;
 /* attr.config2 */
 #define IBS_SW_FILTER_MASK	1
 
+/* attr.config1 */
+#define IBS_OP_CONFIG1_LDLAT_MASK		(0xFFFULL <<  0)
+
 /*
  * IBS states:
  *
@@ -274,7 +277,7 @@ static bool perf_ibs_ldlat_event(struct perf_ibs *perf_ibs,
 {
 	return perf_ibs == &perf_ibs_op &&
 	       (ibs_caps & IBS_CAPS_OPLDLAT) &&
-	       (event->attr.config1 & 0xFFF);
+	       (event->attr.config1 & IBS_OP_CONFIG1_LDLAT_MASK);
 }
 
 static int perf_ibs_init(struct perf_event *event)
@@ -352,13 +355,13 @@ static int perf_ibs_init(struct perf_event *event)
 	}
 
 	if (perf_ibs_ldlat_event(perf_ibs, event)) {
-		u64 ldlat = event->attr.config1 & 0xFFF;
+		u64 ldlat = event->attr.config1 & IBS_OP_CONFIG1_LDLAT_MASK;
 
 		if (ldlat < 128 || ldlat > 2048)
 			return -EINVAL;
 		ldlat >>= 7;
 
-		config |= (ldlat - 1) << 59;
+		config |= (ldlat - 1) << IBS_OP_LDLAT_THRSH_SHIFT;
 
 		config |= IBS_OP_LDLAT_EN;
 		if (cpu_feature_enabled(X86_FEATURE_ZEN5))
@@ -1305,7 +1308,7 @@ fail:
 		 * within [128, 2048] range.
 		 */
 		if (!op_data3.ld_op || !op_data3.dc_miss ||
-		    op_data3.dc_miss_lat <= (event->attr.config1 & 0xFFF)) {
+		    op_data3.dc_miss_lat <= (event->attr.config1 & IBS_OP_CONFIG1_LDLAT_MASK)) {
 			throttle = perf_event_account_interrupt(event);
 			goto out;
 		}
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index ff5acb8..67ecb98 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -671,6 +671,7 @@ struct arch_pebs_cntr_header {
  */
 #define IBS_OP_LDLAT_EN		(1ULL<<63)
 #define IBS_OP_LDLAT_THRSH	(0xFULL<<59)
+#define IBS_OP_LDLAT_THRSH_SHIFT	(59)
 #define IBS_OP_CUR_CNT		(0xFFF80ULL<<32)
 #define IBS_OP_CUR_CNT_RAND	(0x0007FULL<<32)
 #define IBS_OP_CUR_CNT_EXT_MASK	(0x7FULL<<52)