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libperf: Add arm64 support to perf_mmap__read_self() 

Add the arm64 variants for read_perf_counter() and read_timestamp().
Unfortunately the counter number is encoded into the instruction, so the
code is a bit verbose to enumerate all possible counters.

Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/20220201214056.702854-1-robh@kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-perf-users@vger.kernel.org
This commit is contained in:
Rob Herring 2022-02-01 15:40:56 -06:00 committed by Arnaldo Carvalho de Melo
parent 4f2492731a
commit 407eb43ae8
2 changed files with 102 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

98
tools/lib/perf/mmap.c
View File

@ -13,6 +13,7 @@
#include <internal/lib.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/stringify.h>
#include "internal.h"
void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,
@ -294,6 +295,103 @@ static u64 read_timestamp(void)
return low | ((u64)high) << 32;
}
#elif defined(__aarch64__)
#define read_sysreg(r) ({ \
u64 __val; \
asm volatile("mrs %0, " __stringify(r) : "=r" (__val)); \
__val; \
})
static u64 read_pmccntr(void)
{
return read_sysreg(pmccntr_el0);
}
#define PMEVCNTR_READ(idx) \
static u64 read_pmevcntr_##idx(void) { \
return read_sysreg(pmevcntr##idx##_el0); \
}
PMEVCNTR_READ(0);
PMEVCNTR_READ(1);
PMEVCNTR_READ(2);
PMEVCNTR_READ(3);
PMEVCNTR_READ(4);
PMEVCNTR_READ(5);
PMEVCNTR_READ(6);
PMEVCNTR_READ(7);
PMEVCNTR_READ(8);
PMEVCNTR_READ(9);
PMEVCNTR_READ(10);
PMEVCNTR_READ(11);
PMEVCNTR_READ(12);
PMEVCNTR_READ(13);
PMEVCNTR_READ(14);
PMEVCNTR_READ(15);
PMEVCNTR_READ(16);
PMEVCNTR_READ(17);
PMEVCNTR_READ(18);
PMEVCNTR_READ(19);
PMEVCNTR_READ(20);
PMEVCNTR_READ(21);
PMEVCNTR_READ(22);
PMEVCNTR_READ(23);
PMEVCNTR_READ(24);
PMEVCNTR_READ(25);
PMEVCNTR_READ(26);
PMEVCNTR_READ(27);
PMEVCNTR_READ(28);
PMEVCNTR_READ(29);
PMEVCNTR_READ(30);
/*
* Read a value direct from PMEVCNTR<idx>
*/
static u64 read_perf_counter(unsigned int counter)
{
static u64 (* const read_f[])(void) = {
read_pmevcntr_0,
read_pmevcntr_1,
read_pmevcntr_2,
read_pmevcntr_3,
read_pmevcntr_4,
read_pmevcntr_5,
read_pmevcntr_6,
read_pmevcntr_7,
read_pmevcntr_8,
read_pmevcntr_9,
read_pmevcntr_10,
read_pmevcntr_11,
read_pmevcntr_13,
read_pmevcntr_12,
read_pmevcntr_14,
read_pmevcntr_15,
read_pmevcntr_16,
read_pmevcntr_17,
read_pmevcntr_18,
read_pmevcntr_19,
read_pmevcntr_20,
read_pmevcntr_21,
read_pmevcntr_22,
read_pmevcntr_23,
read_pmevcntr_24,
read_pmevcntr_25,
read_pmevcntr_26,
read_pmevcntr_27,
read_pmevcntr_28,
read_pmevcntr_29,
read_pmevcntr_30,
read_pmccntr
};
if (counter < ARRAY_SIZE(read_f))
return (read_f[counter])();
return 0;
}
static u64 read_timestamp(void) { return read_sysreg(cntvct_el0); }
#else
static u64 read_perf_counter(unsigned int counter __maybe_unused) { return 0; }
static u64 read_timestamp(void) { return 0; }

5
tools/lib/perf/tests/test-evsel.c
View File

@ -130,6 +130,9 @@ static int test_stat_user_read(int event)
struct perf_event_attr attr = {
.type = PERF_TYPE_HARDWARE,
.config = event,
#ifdef __aarch64__
.config1 = 0x2, /* Request user access */
#endif
};
int err, i;
@ -150,7 +153,7 @@ static int test_stat_user_read(int event)
pc = perf_evsel__mmap_base(evsel, 0, 0);
__T("failed to get mmapped address", pc);
#if defined(__i386__) || defined(__x86_64__)
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
__T("userspace counter access not supported", pc->cap_user_rdpmc);
__T("userspace counter access not enabled", pc->index);
__T("userspace counter width not set", pc->pmc_width >= 32);