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

Commit-ID:     acc41cdcb091453f48381d1c0d2e76b63c9d985f
Gitweb:        https://git.kernel.org/tip/acc41cdcb091453f48381d1c0d2e76b63c9d985f
Author:        Dapeng Mi <dapeng1.mi@linux.intel.com>
AuthorDate:    Fri, 15 May 2026 14:11:33 +08:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 19 May 2026 13:49:02 +02:00

perf/x86/intel: Update event constraints and cache_extra_regsfor ICX

Update perf hard-coded event constraints and cache_extra_regs[] for
Icelake server according to the latest ICX perfmon events (v1.30).

Since the value of cache extra registers differs with previous
generations, introduce new snc_hw_cache_extra_regs[] to represent the
value of extra registers on ICX.

ICX perfmon events:
https://github.com/intel/perfmon/blob/main/ICX/events/icelakex_core.json

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260515061143.338553-2-dapeng1.mi@linux.intel.com
---
 arch/x86/events/intel/core.c | 48 +++++++++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 2b05587..db409ca 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -310,10 +310,11 @@ static struct extra_reg intel_skl_extra_regs[] __read_mostly = {
 static struct event_constraint intel_icl_event_constraints[] = {
 	FIXED_EVENT_CONSTRAINT(0x00c0, 0),	/* INST_RETIRED.ANY */
 	FIXED_EVENT_CONSTRAINT(0x01c0, 0),	/* old INST_RETIRED.PREC_DIST */
-	FIXED_EVENT_CONSTRAINT(0x0100, 0),	/* INST_RETIRED.PREC_DIST */
+	FIXED_EVENT_CONSTRAINT(0x0100, 0),	/* pseudo INST_RETIRED.ANY */
 	FIXED_EVENT_CONSTRAINT(0x003c, 1),	/* CPU_CLK_UNHALTED.CORE */
-	FIXED_EVENT_CONSTRAINT(0x0300, 2),	/* CPU_CLK_UNHALTED.REF */
-	FIXED_EVENT_CONSTRAINT(0x0400, 3),	/* SLOTS */
+	FIXED_EVENT_CONSTRAINT(0x0200, 1),	/* pseudo CPU_CLK_UNHALTED.THREAD */
+	FIXED_EVENT_CONSTRAINT(0x0300, 2),	/* pseudo CPU_CLK_UNHALTED.REF_TSC */
+	FIXED_EVENT_CONSTRAINT(0x0400, 3),	/* pseudo TOPDOWN.SLOTS */
 	METRIC_EVENT_CONSTRAINT(INTEL_TD_METRIC_RETIRING, 0),
 	METRIC_EVENT_CONSTRAINT(INTEL_TD_METRIC_BAD_SPEC, 1),
 	METRIC_EVENT_CONSTRAINT(INTEL_TD_METRIC_FE_BOUND, 2),
@@ -1019,6 +1020,41 @@ static __initconst const u64 skl_hw_cache_extra_regs
  },
 };
 
+static __initconst const u64 snc_hw_cache_extra_regs
+				[PERF_COUNT_HW_CACHE_MAX]
+				[PERF_COUNT_HW_CACHE_OP_MAX]
+				[PERF_COUNT_HW_CACHE_RESULT_MAX] =
+{
+ [ C(LL  ) ] = {
+	[ C(OP_READ) ] = {
+		[ C(RESULT_ACCESS) ] = 0x10001,		/* OCR.DEMAND_DATA_RD.ANY_RESPONSE */
+		[ C(RESULT_MISS)   ] = 0x3FBFC00001,	/* OCR.DEMAND_DATA_RD.L3_MISS */
+	},
+	[ C(OP_WRITE) ] = {
+		[ C(RESULT_ACCESS) ] = 0x3F3FFC0002,	/* OCR.DEMAND_RFO.ANY_RESPONSE */
+		[ C(RESULT_MISS)   ] = 0x3F3FC00002,	/* OCR.DEMAND_RFO.L3_MISS */
+	},
+	[ C(OP_PREFETCH) ] = {
+		[ C(RESULT_ACCESS) ] = 0x0,
+		[ C(RESULT_MISS)   ] = 0x0,
+	},
+ },
+ [ C(NODE) ] = {
+	[ C(OP_READ) ] = {
+		[ C(RESULT_ACCESS) ] = 0x104000001,	/* OCR.DEMAND_DATA_RD.LOCAL_DRAM */
+		[ C(RESULT_MISS)   ] = 0x730000001,	/* OCR.DEMAND_DATA_RD.REMOTE_DRAM */
+	},
+	[ C(OP_WRITE) ] = {
+		[ C(RESULT_ACCESS) ] = 0x104000002,	/* OCR.DEMAND_RFO.LOCAL_DRAM */
+		[ C(RESULT_MISS)   ] = 0x730000002,	/* OCR.DEMAND_RFO.REMOTE_DRAM */
+	},
+	[ C(OP_PREFETCH) ] = {
+		[ C(RESULT_ACCESS) ] = 0x0,
+		[ C(RESULT_MISS)   ] = 0x0,
+	},
+ },
+};
+
 #define SNB_DMND_DATA_RD	(1ULL << 0)
 #define SNB_DMND_RFO		(1ULL << 1)
 #define SNB_DMND_IFETCH		(1ULL << 2)
@@ -8154,17 +8190,19 @@ __init int intel_pmu_init(void)
 
 	case INTEL_ICELAKE_X:
 	case INTEL_ICELAKE_D:
+		memcpy(hw_cache_extra_regs, snc_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
 		x86_pmu.pebs_ept = 1;
 		pmem = true;
-		fallthrough;
+		goto snc_common;
 	case INTEL_ICELAKE_L:
 	case INTEL_ICELAKE:
 	case INTEL_TIGERLAKE_L:
 	case INTEL_TIGERLAKE:
 	case INTEL_ROCKETLAKE:
+		memcpy(hw_cache_extra_regs, skl_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
+	snc_common:
 		x86_pmu.late_ack = true;
 		memcpy(hw_cache_event_ids, skl_hw_cache_event_ids, sizeof(hw_cache_event_ids));
-		memcpy(hw_cache_extra_regs, skl_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
 		hw_cache_event_ids[C(ITLB)][C(OP_READ)][C(RESULT_ACCESS)] = -1;
 		intel_pmu_lbr_init_skl();