perf pmu: Add pmu_id()
mainline inclusion from mainline-v5.11-rc1 commit 51d54847 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I63VF5 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=51d548471510843e56d9f427aa6473ca0981c4a4 -------------------------------------------------------------------------- Add a function to read the PMU id sysfs entry. This is only done for uncore PMUs where this would possibly be relevant. Signed-off-by: NJohn Garry <john.garry@huawei.com> Acked-by: NKajol Jain <kjain@linux.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Joakim Zhang <qiangqing.zhang@nxp.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Kim Phillips <kim.phillips@amd.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shaokun Zhang <zhangshaokun@hisilicon.com> Cc: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linuxarm@huawei.com Link: http://lore.kernel.org/lkml/1607080216-36968-4-git-send-email-john.garry@huawei.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: NJunhao He <hejunhao3@huawei.com>
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