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98253a546a
Adding perf_msr_probe function to provide interface for
checking up on MSR register and set the related attribute
group visibility.
User defines following struct for each MSR register:
struct perf_msr {
u64 msr;
struct attribute_group *grp;
bool (*test)(int idx, void *data);
bool no_check;
};
Where:
msr - is the MSR address
attrs - is attribute groups array to add if the check passed
test - is test function pointer
no_check - is bool that bypass the check and adds the
attribute without any test
The array of struct perf_msr is passed into:
perf_msr_probe(struct perf_msr *msr, int cnt, bool zero, void *data)
Together with:
cnt - which is the number of struct msr array elements
data - which is user pointer passed to the test function
zero - allow counters that returns zero on rdmsr
The perf_msr_probe will executed test code, read the MSR and
check the value is != 0. If all these tests pass, related
attribute group is kept visible.
Also adding PMU_EVENT_GROUP macro helper to define attribute
group for single attribute. It will be used in following patches.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan <kan.liang@linux.intel.com>
Cc: Liang
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/20190616140358.27799-2-jolsa@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
29 lines
702 B
C
29 lines
702 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ARCH_X86_EVENTS_PROBE_H__
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#define __ARCH_X86_EVENTS_PROBE_H__
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#include <linux/sysfs.h>
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struct perf_msr {
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u64 msr;
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struct attribute_group *grp;
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bool (*test)(int idx, void *data);
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bool no_check;
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};
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unsigned long
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perf_msr_probe(struct perf_msr *msr, int cnt, bool no_zero, void *data);
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#define __PMU_EVENT_GROUP(_name) \
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static struct attribute *attrs_##_name[] = { \
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&attr_##_name.attr.attr, \
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NULL, \
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}
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#define PMU_EVENT_GROUP(_grp, _name) \
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__PMU_EVENT_GROUP(_name); \
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static struct attribute_group group_##_name = { \
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.name = #_grp, \
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.attrs = attrs_##_name, \
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}
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#endif /* __ARCH_X86_EVENTS_PROBE_H__ */
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