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authorKan Liang <kan.liang@linux.intel.com>2021-04-12 07:30:57 -0700
committerPeter Zijlstra <peterz@infradead.org>2021-04-19 20:03:28 +0200
commita9c81ccdf52dd73a20178c40bca34cf52991fdea (patch)
treee20e9444618770bcb80876b31f84970fe2d9fbc2 /include/linux
parentperf/x86: Register hybrid PMUs (diff)
downloadlinux-dev-a9c81ccdf52dd73a20178c40bca34cf52991fdea.tar.xz
linux-dev-a9c81ccdf52dd73a20178c40bca34cf52991fdea.zip
perf/x86: Add structures for the attributes of Hybrid PMUs
Hybrid PMUs have different events and formats. In theory, Hybrid PMU specific attributes should be maintained in the dedicated struct x86_hybrid_pmu, but it wastes space because the events and formats are similar among Hybrid PMUs. To reduce duplication, all hybrid PMUs will share a group of attributes in the following patch. To distinguish an attribute from different Hybrid PMUs, a PMU aware attribute structure is introduced. A PMU type is required for the attribute structure. The type is internal usage. It is not visible in the sysfs API. Hybrid PMUs may support the same event name, but with different event encoding, e.g., the mem-loads event on an Atom PMU has different event encoding from a Core PMU. It brings issue if two attributes are created for them. Current sysfs_update_group finds an attribute by searching the attr name (aka event name). If two attributes have the same event name, the first attribute will be replaced. To address the issue, only one attribute is created for the event. The event_str is extended and stores event encodings from all Hybrid PMUs. Each event encoding is divided by ";". The order of the event encodings must follow the order of the hybrid PMU index. The event_str is internal usage as well. When a user wants to show the attribute of a Hybrid PMU, only the corresponding part of the string is displayed. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Andi Kleen <ak@linux.intel.com> Link: https://lkml.kernel.org/r/1618237865-33448-18-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/perf_event.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 8989b2b7268d..61b385154c4a 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1549,6 +1549,18 @@ struct perf_pmu_events_ht_attr {
const char *event_str_noht;
};
+struct perf_pmu_events_hybrid_attr {
+ struct device_attribute attr;
+ u64 id;
+ const char *event_str;
+ u64 pmu_type;
+};
+
+struct perf_pmu_format_hybrid_attr {
+ struct device_attribute attr;
+ u64 pmu_type;
+};
+
ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
char *page);