archive mirror
 help / color / mirror / Atom feed
From: "tip-bot2 for Alexander Antonov" <>
Cc: Kyle Meyer <>,
	Kan Liang <>,
	Alexander Antonov <>,
	"Peter Zijlstra (Intel)" <>,
	Alexei Budankov <>,
	x86 <>, LKML <>
Subject: [tip: perf/core] perf/x86/intel/uncore: Fix for iio mapping on Skylake Server
Date: Wed, 30 Sep 2020 18:58:53 -0000	[thread overview]
Message-ID: <160149233331.7002.10919231011379055356.tip-bot2@tip-bot2> (raw)
In-Reply-To: <>

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

Commit-ID:     f797f05d917ffef94249ee0aec4c14a5b50517b2
Author:        Alexander Antonov <>
AuthorDate:    Mon, 28 Sep 2020 13:21:33 +03:00
Committer:     Peter Zijlstra <>
CommitterDate: Tue, 29 Sep 2020 09:57:02 +02:00

perf/x86/intel/uncore: Fix for iio mapping on Skylake Server

Introduced early attributes /sys/devices/uncore_iio_<pmu_idx>/die* are
initialized by skx_iio_set_mapping(), however, for example, for multiple
segment platforms skx_iio_get_topology() returns -EPERM before a list of
attributes in skx_iio_mapping_group will have been initialized.
As a result the list is being NULL. Thus the warning
"sysfs: (bin_)attrs not set by subsystem for group: uncore_iio_*/" appears
and uncore_iio pmus are not available in sysfs. Clear IIO attr_update
to properly handle the cases when topology information cannot be

Fixes: bb42b3d39781 ("perf/x86/intel/uncore: Expose an Uncore unit to IIO PMON mapping")
Reported-by: Kyle Meyer <>
Suggested-by: Kan Liang <>
Signed-off-by: Alexander Antonov <>
Signed-off-by: Peter Zijlstra (Intel) <>
Reviewed-by: Alexei Budankov <>
Reviewed-by: Kan Liang <>
 arch/x86/events/intel/uncore_snbep.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 495056f..3f1e75f 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3754,7 +3754,9 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
 	ret = skx_iio_get_topology(type);
 	if (ret)
-		return ret;
+		goto clear_attr_update;
+	ret = -ENOMEM;
 	/* One more for NULL. */
 	attrs = kcalloc((uncore_max_dies() + 1), sizeof(*attrs), GFP_KERNEL);
@@ -3786,8 +3788,9 @@ err:
 	type->attr_update = NULL;
-	return -ENOMEM;
+	return ret;
 static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)

  reply	other threads:[~2020-09-30 18:59 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-28 10:21 [PATCH] perf/x86/intel/uncore: Fix for iio mapping on Skylake Server alexander.antonov
2020-09-30 18:58 ` tip-bot2 for Alexander Antonov [this message]
2020-10-09 14:11 ` Meyer, Kyle
2020-10-13 14:37   ` Alexander Antonov
2020-11-03 21:47     ` Meyer, Kyle

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=160149233331.7002.10919231011379055356.tip-bot2@tip-bot2 \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).