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Subject[tip: perf/core] perf/x86/intel/uncore: Fix for iio mapping on Skylake Server
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)
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