linux-kernel - [PATCH 05/11] perf/amd/ibs: Define macro for ldlat mask

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Message-ID: <20260116033450.965-6-ravi.bangoria@amd.com>
Date: Fri, 16 Jan 2026 03:34:44 +0000
From: Ravi Bangoria <ravi.bangoria@....com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>
CC: Ravi Bangoria <ravi.bangoria@....com>, Arnaldo Carvalho de Melo
	<acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Ian Rogers
	<irogers@...gle.com>, Dapeng Mi <dapeng1.mi@...ux.intel.com>, James Clark
	<james.clark@...aro.org>, <x86@...nel.org>,
	<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Manali
 Shukla" <manali.shukla@....com>, Santosh Shukla <santosh.shukla@....com>,
	Ananth Narayan <ananth.narayan@....com>, Sandipan Das <sandipan.das@....com>
Subject: [PATCH 05/11] perf/amd/ibs: Define macro for ldlat mask

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@....com>
---
 arch/x86/events/amd/ibs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 27b764eee6c7..02e7bffe1208 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)
@@ -349,7 +352,7 @@ 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;
@@ -1302,7 +1305,7 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
 		 * 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;
 		}
-- 
2.43.0