Messages in this thread | | | From | Arnaldo Carvalho de Melo <> | Date | Wed, 12 Feb 2020 10:35:02 -0300 | Subject | Re: [PATCH] perf tools: Add arm64 version of get_cpuid() |
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Em Wed, Feb 12, 2020 at 05:30:56PM +0800, Shaokun Zhang escreveu: > Hi John, > > 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. > > Tested-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Thanks for the test and for (re)bringing this patch to my attention, I'll process it now.
Thanks!
- Arnaldo
> Thanks, > Shaokun > > On 2019/12/13 21:54, John Garry wrote: > > 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. > > > > Signed-off-by: John Garry <john.garry@huawei.com> > > > > diff --git a/tools/perf/arch/arm64/util/header.c b/tools/perf/arch/arm64/util/header.c > > index a32e4b72a98f..d730666ab95d 100644 > > --- a/tools/perf/arch/arm64/util/header.c > > +++ b/tools/perf/arch/arm64/util/header.c > > @@ -1,8 +1,10 @@ > > #include <stdio.h> > > #include <stdlib.h> > > #include <perf/cpumap.h> > > +#include <util/cpumap.h> > > #include <internal/cpumap.h> > > #include <api/fs/fs.h> > > +#include <errno.h> > > #include "debug.h" > > #include "header.h" > > > > @@ -12,26 +14,21 @@ > > #define MIDR_VARIANT_SHIFT 20 > > #define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT) > > > > -char *get_cpuid_str(struct perf_pmu *pmu) > > +static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus) > > { > > - char *buf = NULL; > > - char path[PATH_MAX]; > > const char *sysfs = sysfs__mountpoint(); > > - int cpu; > > u64 midr = 0; > > - struct perf_cpu_map *cpus; > > - FILE *file; > > + int cpu; > > > > - if (!sysfs || !pmu || !pmu->cpus) > > - return NULL; > > + if (!sysfs || sz < MIDR_SIZE) > > + return EINVAL; > > > > - buf = malloc(MIDR_SIZE); > > - if (!buf) > > - return NULL; > > + cpus = perf_cpu_map__get(cpus); > > > > - /* read midr from list of cpus mapped to this pmu */ > > - cpus = perf_cpu_map__get(pmu->cpus); > > for (cpu = 0; cpu < perf_cpu_map__nr(cpus); cpu++) { > > + char path[PATH_MAX]; > > + FILE *file; > > + > > scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d"MIDR, > > sysfs, cpus->map[cpu]); > > > > @@ -57,12 +54,48 @@ char *get_cpuid_str(struct perf_pmu *pmu) > > break; > > } > > > > - if (!midr) { > > + perf_cpu_map__put(cpus); > > + > > + if (!midr) > > + return EINVAL; > > + > > + return 0; > > +} > > + > > +int get_cpuid(char *buf, size_t sz) > > +{ > > + struct perf_cpu_map *cpus = perf_cpu_map__new(NULL); > > + int ret; > > + > > + if (!cpus) > > + return EINVAL; > > + > > + ret = _get_cpuid(buf, sz, cpus); > > + > > + perf_cpu_map__put(cpus); > > + > > + return ret; > > +} > > + > > +char *get_cpuid_str(struct perf_pmu *pmu) > > +{ > > + char *buf = NULL; > > + int res; > > + > > + if (!pmu || !pmu->cpus) > > + return NULL; > > + > > + buf = malloc(MIDR_SIZE); > > + if (!buf) > > + return NULL; > > + > > + /* read midr from list of cpus mapped to this pmu */ > > + res = _get_cpuid(buf, MIDR_SIZE, pmu->cpus); > > + if (res) { > > pr_err("failed to get cpuid string for PMU %s\n", pmu->name); > > free(buf); > > buf = NULL; > > } > > > > - perf_cpu_map__put(cpus); > > return buf; > > } > > >
--
- Arnaldo
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