forked from Minki/linux
df5a5f3cf2
Add an arm64 version of get_cpuid(), which is used for various annotation and headers - for example, I now get the CPUID in "perf report --header", as shown in this snippet: # hostname : ubuntu # os release : 5.5.0-rc1-dirty # perf version : 5.5.rc1.gbf8a13dc9851 # arch : aarch64 # nrcpus online : 96 # nrcpus avail : 96 # cpuid : 0x00000000480fd010 Since much of the code to read the MIDR is already in get_cpuid_str(), factor out this code. Tester notes: I tested this patch on my new ARM64 Kunpeng 920 server. [root@node1 zsk]# ./perf --version perf version 5.6.rc1.g2cdb955b7252 Both perf list and perf stat can work. Signed-off-by: John Garry <john.garry@huawei.com> Tested-by: Shaokun Zhang <zhangshaokun@hisilicon.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linuxarm@huawei.com Link: http://lore.kernel.org/lkml/1576245255-210926-1-git-send-email-john.garry@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
102 lines
1.9 KiB
C
102 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <perf/cpumap.h>
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#include <util/cpumap.h>
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#include <internal/cpumap.h>
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#include <api/fs/fs.h>
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#include <errno.h>
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#include "debug.h"
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#include "header.h"
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#define MIDR "/regs/identification/midr_el1"
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#define MIDR_SIZE 19
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#define MIDR_REVISION_MASK 0xf
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#define MIDR_VARIANT_SHIFT 20
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#define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT)
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static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus)
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{
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const char *sysfs = sysfs__mountpoint();
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u64 midr = 0;
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int cpu;
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if (!sysfs || sz < MIDR_SIZE)
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return EINVAL;
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cpus = perf_cpu_map__get(cpus);
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for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) {
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char path[PATH_MAX];
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FILE *file;
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scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR,
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sysfs, cpus->map[cpu]);
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file = fopen(path, "r");
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if (!file) {
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pr_debug("fopen failed for file %s\n", path);
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continue;
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}
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if (!fgets(buf, MIDR_SIZE, file)) {
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fclose(file);
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continue;
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}
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fclose(file);
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/* Ignore/clear Variant[23:20] and
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* Revision[3:0] of MIDR
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*/
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midr = strtoul(buf, NULL, 16);
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midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK));
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scnprintf(buf, MIDR_SIZE, "0x%016lx", midr);
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/* got midr break loop */
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break;
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}
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perf_cpu_map__put(cpus);
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if (!midr)
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return EINVAL;
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return 0;
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}
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int get_cpuid(char *buf, size_t sz)
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{
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struct perf_cpu_map *cpus = perf_cpu_map__new(NULL);
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int ret;
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if (!cpus)
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return EINVAL;
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ret = _get_cpuid(buf, sz, cpus);
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perf_cpu_map__put(cpus);
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return ret;
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}
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char *get_cpuid_str(struct perf_pmu *pmu)
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{
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char *buf = NULL;
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int res;
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if (!pmu || !pmu->cpus)
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return NULL;
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buf = malloc(MIDR_SIZE);
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if (!buf)
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return NULL;
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/* read midr from list of cpus mapped to this pmu */
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res = _get_cpuid(buf, MIDR_SIZE, pmu->cpus);
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if (res) {
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pr_err("failed to get cpuid string for PMU %s\n", pmu->name);
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free(buf);
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buf = NULL;
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}
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return buf;
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}
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