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Subject[PATCH] perf/x86/intel/uncore: Fix for iio mapping on Skylake Server
From: Alexander Antonov <>

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 <>
Reviewed-by: Alexei Budankov <>
Reviewed-by: Kan Liang <>
Signed-off-by: Alexander Antonov <>
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 62e88ad919ff..ccfa1d6b6aa0 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3749,7 +3749,9 @@ 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);
@@ -3781,8 +3783,9 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
type->attr_update = NULL;
- return -ENOMEM;
+ return ret;

static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)
base-commit: a1b8638ba1320e6684aa98233c15255eb803fac7

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