linux-kernel - [tip: perf/core] perf/amd/ibs: Make IBS a core pmu

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Date:   Thu, 24 Nov 2022 12:03:03 -0000
From:   "tip-bot2 for Ravi Bangoria" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Ravi Bangoria <ravi.bangoria@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ian Rogers <irogers@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf/amd/ibs: Make IBS a core pmu

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

Commit-ID:     30093056f7b2f759ff180d3a86d29f68315e469b
Gitweb:        https://git.kernel.org/tip/30093056f7b2f759ff180d3a86d29f68315e469b
Author:        Ravi Bangoria <ravi.bangoria@....com>
AuthorDate:    Tue, 15 Nov 2022 15:09:04 +05:30
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 24 Nov 2022 11:09:19 +01:00

perf/amd/ibs: Make IBS a core pmu

So far, only one pmu was allowed to be registered as core pmu and thus
IBS pmus were being registered as uncore. However, with the event context
rewrite, that limitation no longer exists and thus IBS pmus can also be
registered as core pmu. This makes IBS much more usable, for ex, user
will be able to do per-process precise monitoring on AMD:

Before patch:
  $ sudo perf record -e cycles:pp ls
  Error:
  Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a'

After patch:
  $ sudo perf record -e cycles:pp ls
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.017 MB perf.data (33 samples) ]

Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Ian Rogers <irogers@...gle.com>
Link: https://lkml.kernel.org/r/20221115093904.1799-1-ravi.bangoria@amd.com
---
 arch/x86/events/amd/ibs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 3271735..fbc2ce8 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -631,7 +631,7 @@ static const struct attribute_group *op_attr_update[] = {
 
 static struct perf_ibs perf_ibs_fetch = {
 	.pmu = {
-		.task_ctx_nr	= perf_invalid_context,
+		.task_ctx_nr	= perf_hw_context,
 
 		.event_init	= perf_ibs_init,
 		.add		= perf_ibs_add,
@@ -655,7 +655,7 @@ static struct perf_ibs perf_ibs_fetch = {
 
 static struct perf_ibs perf_ibs_op = {
 	.pmu = {
-		.task_ctx_nr	= perf_invalid_context,
+		.task_ctx_nr	= perf_hw_context,
 
 		.event_init	= perf_ibs_init,
 		.add		= perf_ibs_add,