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Subject[tip: perf/core] perf/x86/intel: Fix ICL/SPR INST_RETIRED.PREC_DIST encodings
The following commit has been merged into the perf/core branch of tip:

Commit-ID: 2de71ee153efa93099d2ab864acffeec70a8dcd5
Gitweb: https://git.kernel.org/tip/2de71ee153efa93099d2ab864acffeec70a8dcd5
Author: Stephane Eranian <eranian@google.com>
AuthorDate: Wed, 13 Oct 2021 17:12:14 -07:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Sat, 30 Oct 2021 16:37:24 +02:00

perf/x86/intel: Fix ICL/SPR INST_RETIRED.PREC_DIST encodings

This patch fixes the encoding for INST_RETIRED.PREC_DIST as published by Intel
(download.01.org/perfmon/) for Icelake. The official encoding
is event code 0x00 umask 0x1, a change from Skylake where it was code 0xc0
umask 0x1.

With this patch applied it is possible to run:
$ perf record -a -e cpu/event=0x00,umask=0x1/pp .....

Whereas before this would fail.

To avoid problems with tools which may use the old code, we maintain the old
encoding for Icelake.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211014001214.2680534-1-eranian@google.com
---
arch/x86/events/intel/core.c | 5 +++--
arch/x86/events/intel/ds.c | 5 +++--
2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index a555e7c..c67d95e 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -243,7 +243,8 @@ 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), /* INST_RETIRED.PREC_DIST */
+ FIXED_EVENT_CONSTRAINT(0x01c0, 0), /* old INST_RETIRED.PREC_DIST */
+ FIXED_EVENT_CONSTRAINT(0x0100, 0), /* INST_RETIRED.PREC_DIST */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
FIXED_EVENT_CONSTRAINT(0x0300, 2), /* CPU_CLK_UNHALTED.REF */
FIXED_EVENT_CONSTRAINT(0x0400, 3), /* SLOTS */
@@ -287,7 +288,7 @@ static struct extra_reg intel_spr_extra_regs[] __read_mostly = {

static struct event_constraint intel_spr_event_constraints[] = {
FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* INST_RETIRED.ANY */
- FIXED_EVENT_CONSTRAINT(0x01c0, 0), /* INST_RETIRED.PREC_DIST */
+ FIXED_EVENT_CONSTRAINT(0x0100, 0), /* INST_RETIRED.PREC_DIST */
FIXED_EVENT_CONSTRAINT(0x003c, 1), /* CPU_CLK_UNHALTED.CORE */
FIXED_EVENT_CONSTRAINT(0x0300, 2), /* CPU_CLK_UNHALTED.REF */
FIXED_EVENT_CONSTRAINT(0x0400, 3), /* SLOTS */
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index 8647713..4dbb55a 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -923,7 +923,8 @@ struct event_constraint intel_skl_pebs_event_constraints[] = {
};

struct event_constraint intel_icl_pebs_event_constraints[] = {
- INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL), /* INST_RETIRED.PREC_DIST */
+ INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x100000000ULL), /* old INST_RETIRED.PREC_DIST */
+ INTEL_FLAGS_UEVENT_CONSTRAINT(0x0100, 0x100000000ULL), /* INST_RETIRED.PREC_DIST */
INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL), /* SLOTS */

INTEL_PLD_CONSTRAINT(0x1cd, 0xff), /* MEM_TRANS_RETIRED.LOAD_LATENCY */
@@ -943,7 +944,7 @@ struct event_constraint intel_icl_pebs_event_constraints[] = {
};

struct event_constraint intel_spr_pebs_event_constraints[] = {
- INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL),
+ INTEL_FLAGS_UEVENT_CONSTRAINT(0x100, 0x100000000ULL), /* INST_RETIRED.PREC_DIST */
INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL),

INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xfe),
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