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SubjectRe: [PATCH] perf/x86/intel/uncore: Fix IIO cleanup mapping procedure for SNR/ICX
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On 7/6/2021 5:07 AM, alexander.antonov@linux.intel.com wrote:
> From: Alexander Antonov <alexander.antonov@linux.intel.com>
>
> Cleanup mapping procedure for IIO PMU is needed to free memory which was
> allocated for topology data and for attributes in IIO mapping
> attribute_group.
> Current implementation of this procedure for Snowridge and Icelake Server
> platforms doesn't free allocated memory that can be a reason for memory
> leak issue.
> Fix the issue with IIO cleanup mapping procedure for these platforms
> to release allocated memory.
>
> Fixes: 10337e95e04c ("perf/x86/intel/uncore: Enable I/O stacks to IIO PMON mapping on ICX")
>
> Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>

The patch looks good to me.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>


With this fix, there will be several similar codes repeat, e.g.,
XXX_iio_set_mapping() and XXX_iio_cleanup_mapping(), for SKX, ICX, and
SNR for now.
I guess there will be more for the future platforms. Have you considered
to add a macro or something to reduce the code repetition?

Thanks,
Kan

> ---
> arch/x86/events/intel/uncore_snbep.c | 40 +++++++++++++++++++---------
> 1 file changed, 28 insertions(+), 12 deletions(-)
>
> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
> index bb6eb1e5569c..54cdbb96e628 100644
> --- a/arch/x86/events/intel/uncore_snbep.c
> +++ b/arch/x86/events/intel/uncore_snbep.c
> @@ -3836,26 +3836,32 @@ pmu_iio_set_mapping(struct intel_uncore_type *type, struct attribute_group *ag)
> return ret;
> }
>
> -static int skx_iio_set_mapping(struct intel_uncore_type *type)
> -{
> - return pmu_iio_set_mapping(type, &skx_iio_mapping_group);
> -}
> -
> -static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)
> +static void
> +pmu_iio_cleanup_mapping(struct intel_uncore_type *type, struct attribute_group *ag)
> {
> - struct attribute **attr = skx_iio_mapping_group.attrs;
> + struct attribute **attr = ag->attrs;
>
> if (!attr)
> return;
>
> for (; *attr; attr++)
> kfree((*attr)->name);
> - kfree(attr_to_ext_attr(*skx_iio_mapping_group.attrs));
> - kfree(skx_iio_mapping_group.attrs);
> - skx_iio_mapping_group.attrs = NULL;
> + kfree(attr_to_ext_attr(*ag->attrs));
> + kfree(ag->attrs);
> + ag->attrs = NULL;
> kfree(type->topology);
> }
>
> +static int skx_iio_set_mapping(struct intel_uncore_type *type)
> +{
> + return pmu_iio_set_mapping(type, &skx_iio_mapping_group);
> +}
> +
> +static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)
> +{
> + pmu_iio_cleanup_mapping(type, &skx_iio_mapping_group);
> +}
> +
> static struct intel_uncore_type skx_uncore_iio = {
> .name = "iio",
> .num_counters = 4,
> @@ -4499,6 +4505,11 @@ static int snr_iio_set_mapping(struct intel_uncore_type *type)
> return pmu_iio_set_mapping(type, &snr_iio_mapping_group);
> }
>
> +static void snr_iio_cleanup_mapping(struct intel_uncore_type *type)
> +{
> + pmu_iio_cleanup_mapping(type, &snr_iio_mapping_group);
> +}
> +
> static struct intel_uncore_type snr_uncore_iio = {
> .name = "iio",
> .num_counters = 4,
> @@ -4515,7 +4526,7 @@ static struct intel_uncore_type snr_uncore_iio = {
> .attr_update = snr_iio_attr_update,
> .get_topology = snr_iio_get_topology,
> .set_mapping = snr_iio_set_mapping,
> - .cleanup_mapping = skx_iio_cleanup_mapping,
> + .cleanup_mapping = snr_iio_cleanup_mapping,
> };
>
> static struct intel_uncore_type snr_uncore_irp = {
> @@ -5090,6 +5101,11 @@ static int icx_iio_set_mapping(struct intel_uncore_type *type)
> return pmu_iio_set_mapping(type, &icx_iio_mapping_group);
> }
>
> +static void icx_iio_cleanup_mapping(struct intel_uncore_type *type)
> +{
> + pmu_iio_cleanup_mapping(type, &icx_iio_mapping_group);
> +}
> +
> static struct intel_uncore_type icx_uncore_iio = {
> .name = "iio",
> .num_counters = 4,
> @@ -5107,7 +5123,7 @@ static struct intel_uncore_type icx_uncore_iio = {
> .attr_update = icx_iio_attr_update,
> .get_topology = icx_iio_get_topology,
> .set_mapping = icx_iio_set_mapping,
> - .cleanup_mapping = skx_iio_cleanup_mapping,
> + .cleanup_mapping = icx_iio_cleanup_mapping,
> };
>
> static struct intel_uncore_type icx_uncore_irp = {
>
> base-commit: 3dbdb38e286903ec220aaf1fb29a8d94297da246
>

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