Messages in this thread Patch in this message | | | From | alexander.antonov@linux ... | Subject | [PATCH] perf/x86/intel/uncore: Fix for iio mapping on Skylake Server | Date | Mon, 28 Sep 2020 13:21:33 +0300 |
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From: Alexander Antonov <alexander.antonov@linux.intel.com>
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 retrieved.
Fixes: bb42b3d39781 ("perf/x86/intel/uncore: Expose an Uncore unit to IIO PMON mapping") Reported-by: Kyle Meyer <kyle.meyer@hpe.com> Suggested-by: Kan Liang <kan.liang@linux.intel.com> Reviewed-by: Alexei Budankov <alexey.budankov@linux.intel.com> Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com> --- 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) kfree(eas); kfree(attrs); kfree(type->topology); +clear_attr_update: type->attr_update = NULL; - return -ENOMEM; + return ret; } static void skx_iio_cleanup_mapping(struct intel_uncore_type *type) base-commit: a1b8638ba1320e6684aa98233c15255eb803fac7 -- 2.19.1
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