From c2f1cead19b628d7a23d2cfc43e444af669f9eab Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Fri, 20 Oct 2017 13:27:55 -0700 Subject: perf record: Fix -c/-F options for cpu event aliases The Intel PMU event aliases have a implicit period= specifier to set the default period. Unfortunately this breaks overriding these periods with -c or -F, because the alias terms look like they are user specified to the internal parser, and user specified event qualifiers override the command line options. Track that they are coming from aliases by adding a "weak" state to the term. Any weak terms don't override command line options. I only did it for -c/-F for now, I think that's the only case that's broken currently. Before: $ perf record -c 1000 -vv -e uops_issued.any ... { sample_period, sample_freq } 2000003 After: $ perf record -c 1000 -vv -e uops_issued.any ... { sample_period, sample_freq } 1000 Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Link: http://lkml.kernel.org/r/20171020202755.21410-2-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/pmu.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'tools/perf/util/pmu.c') diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 07cb2ac041d7..80fb1593913a 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -405,6 +405,11 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias, parse_events_terms__purge(&list); return ret; } + /* + * Weak terms don't override command line options, + * which we don't want for implicit terms in aliases. + */ + cloned->weak = true; list_add_tail(&cloned->list, &list); } list_splice(&list, terms); -- cgit v1.2.3 From 54e32dc0f89ec7fcb87df6c45b096e57f050f22b Mon Sep 17 00:00:00 2001 From: Ganapatrao Kulkarni Date: Tue, 17 Oct 2017 00:02:18 +0530 Subject: perf pmu: Pass pmu as a parameter to get_cpuid_str() The cpuid string will not be same on all CPUs on heterogeneous platforms like ARM's big.LITTLE, adding provision(using pmu->cpus) to find cpuid string from associated CPUs of PMU CORE device. Also optimise arguments to function pmu_add_cpu_aliases. Signed-off-by: Ganapatrao Kulkarni Acked-by: Will Deacon Cc: Alexander Shishkin Cc: Catalin Marinas Cc: Jayachandran C Cc: Jonathan Cameron Cc: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland Cc: Peter Zijlstra Cc: Robert Richter Cc: Shaokun Zhang Link: http://lkml.kernel.org/r/20171016183222.25750-2-ganapatrao.kulkarni@cavium.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/pmu.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) (limited to 'tools/perf/util/pmu.c') diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 80fb1593913a..4e7dd3a0f123 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -542,12 +542,12 @@ static bool pmu_is_uncore(const char *name) * Each architecture should provide a more precise id string that * can be use to match the architecture's "mapfile". */ -char * __weak get_cpuid_str(void) +char * __weak get_cpuid_str(struct perf_pmu *pmu __maybe_unused) { return NULL; } -static char *perf_pmu__getcpuid(void) +static char *perf_pmu__getcpuid(struct perf_pmu *pmu) { char *cpuid; static bool printed; @@ -556,7 +556,7 @@ static char *perf_pmu__getcpuid(void) if (cpuid) cpuid = strdup(cpuid); if (!cpuid) - cpuid = get_cpuid_str(); + cpuid = get_cpuid_str(pmu); if (!cpuid) return NULL; @@ -567,10 +567,10 @@ static char *perf_pmu__getcpuid(void) return cpuid; } -struct pmu_events_map *perf_pmu__find_map(void) +struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu) { struct pmu_events_map *map; - char *cpuid = perf_pmu__getcpuid(); + char *cpuid = perf_pmu__getcpuid(pmu); int i; i = 0; @@ -593,13 +593,14 @@ struct pmu_events_map *perf_pmu__find_map(void) * to the current running CPU. Then, add all PMU events from that table * as aliases. */ -static void pmu_add_cpu_aliases(struct list_head *head, const char *name) +static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu) { int i; struct pmu_events_map *map; struct pmu_event *pe; + const char *name = pmu->name; - map = perf_pmu__find_map(); + map = perf_pmu__find_map(pmu); if (!map) return; @@ -661,21 +662,20 @@ static struct perf_pmu *pmu_lookup(const char *name) if (pmu_aliases(name, &aliases)) return NULL; - pmu_add_cpu_aliases(&aliases, name); pmu = zalloc(sizeof(*pmu)); if (!pmu) return NULL; pmu->cpus = pmu_cpumask(name); - + pmu->name = strdup(name); + pmu->type = type; pmu->is_uncore = pmu_is_uncore(name); + pmu_add_cpu_aliases(&aliases, pmu); INIT_LIST_HEAD(&pmu->format); INIT_LIST_HEAD(&pmu->aliases); list_splice(&format, &pmu->format); list_splice(&aliases, &pmu->aliases); - pmu->name = strdup(name); - pmu->type = type; list_add_tail(&pmu->list, &pmus); pmu->default_config = perf_pmu__get_default_config(pmu); -- cgit v1.2.3 From 14b22ae028de56cca980171db625d1e9925c8fba Mon Sep 17 00:00:00 2001 From: Ganapatrao Kulkarni Date: Thu, 24 Aug 2017 16:30:58 +0530 Subject: perf pmu: Add helper function is_pmu_core to detect PMU CORE devices On some platforms, PMU core devices sysfs name is not cpu. Adding function is_pmu_core to detect PMU core devices using core device specific hints in sysfs. For arm64 platforms, all core devices have file "cpus" in sysfs. Signed-off-by: Ganapatrao Kulkarni Tested-by: Shaokun Zhang Tested-by: Jin Yao Acked-by: Will Deacon Link: https://lkml.kernel.org/n/tip-y1woxt1k2pqqwpprhonnft2s@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/pmu.c | 39 +++++++++++++++++++++++++++++++++++---- 1 file changed, 35 insertions(+), 4 deletions(-) (limited to 'tools/perf/util/pmu.c') diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 4e7dd3a0f123..732ff579ec65 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -536,6 +536,34 @@ static bool pmu_is_uncore(const char *name) return !!cpus; } +/* + * PMU CORE devices have different name other than cpu in sysfs on some + * platforms. looking for possible sysfs files to identify as core device. + */ +static int is_pmu_core(const char *name) +{ + struct stat st; + char path[PATH_MAX]; + const char *sysfs = sysfs__mountpoint(); + + if (!sysfs) + return 0; + + /* Look for cpu sysfs (x86 and others) */ + scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/cpu", sysfs); + if ((stat(path, &st) == 0) && + (strncmp(name, "cpu", strlen("cpu")) == 0)) + return 1; + + /* Look for cpu sysfs (specific to arm) */ + scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus", + sysfs, name); + if (stat(path, &st) == 0) + return 1; + + return 0; +} + /* * Return the CPU id as a raw string. * @@ -609,7 +637,6 @@ static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu) */ i = 0; while (1) { - const char *pname; pe = &map->table[i++]; if (!pe->name) { @@ -618,9 +645,13 @@ static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu) break; } - pname = pe->pmu ? pe->pmu : "cpu"; - if (strncmp(pname, name, strlen(pname))) - continue; + if (!is_pmu_core(name)) { + /* check for uncore devices */ + if (pe->pmu == NULL) + continue; + if (strncmp(pe->pmu, name, strlen(pe->pmu))) + continue; + } /* need type casts to override 'const' */ __perf_pmu__new_alias(head, NULL, (char *)pe->name, -- cgit v1.2.3 From de3d0f12be476271d03f1ddb5a7c241c2f07f126 Mon Sep 17 00:00:00 2001 From: Ganapatrao Kulkarni Date: Tue, 17 Oct 2017 00:02:22 +0530 Subject: perf pmu: Add check for valid cpuid in perf_pmu__find_map() On some platforms(arm/arm64) which uses cpus map to get corresponding cpuid string, cpuid can be NULL for PMUs other than CORE PMUs. Adding check for NULL cpuid in function perf_pmu__find_map to avoid segmentation fault. Signed-off-by: Ganapatrao Kulkarni Cc: Alexander Shishkin Cc: Catalin Marinas Cc: Ganapatrao Kulkarni Cc: Jayachandran C Cc: Jonathan Cameron Cc: Mark Rutland Cc: Peter Zijlstra Cc: Robert Richter Cc: Shaokun Zhang Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20171016183222.25750-6-ganapatrao.kulkarni@cavium.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/pmu.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'tools/perf/util/pmu.c') diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 732ff579ec65..8b7c151579c0 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -601,6 +601,12 @@ struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu) char *cpuid = perf_pmu__getcpuid(pmu); int i; + /* on some platforms which uses cpus map, cpuid can be NULL for + * PMUs other than CORE PMUs. + */ + if (!cpuid) + return NULL; + i = 0; for (;;) { map = &pmu_events_map[i++]; -- cgit v1.2.3 From fbc2844e84038ce3687d203ac80b66194e9f21e6 Mon Sep 17 00:00:00 2001 From: William Cohen Date: Mon, 4 Dec 2017 09:57:28 -0500 Subject: perf vendor events: Use more flexible pattern matching for CPU identification for mapfile.csv The powerpc cpuid information includes chip revision information. Changes between chip revisions are usually minor bug fixes and usually do not affect the operation of the performance monitoring hardware. The original mapfile.csv matching requires enumerating every possible cpuid string. When a new minor chip revision is produced a new entry has to be added to the mapfile.csv and the code recompiled to allow perf to have the implementation specific perf events for this new minor revision. For users of various distibutions of Linux having to wait for a new release of the kernel's perf tool to be built with these trivial patches is inconvenient. Using regular expressions rather than exactly string matching of the entire cpuid string allows developers to write mapfile.csv files that do not require patches and recompiles for each of these minor version changes. If special cases need to be made for some particular versions, they can be placed earlier in the mapfile.csv file before the more general matches. Signed-off-by: William Cohen Tested-by: Ravi Bangoria Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Shriya Link: http://lkml.kernel.org/r/20171204145728.16792-1-wcohen@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/pmu.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) (limited to 'tools/perf/util/pmu.c') diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 8b7c151579c0..57e38fdf0b34 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -12,6 +12,7 @@ #include #include #include +#include #include "util.h" #include "pmu.h" #include "parse-events.h" @@ -609,14 +610,31 @@ struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu) i = 0; for (;;) { + regex_t re; + regmatch_t pmatch[1]; + int match; + map = &pmu_events_map[i++]; if (!map->table) { map = NULL; break; } - if (!strcmp(map->cpuid, cpuid)) + if (regcomp(&re, map->cpuid, REG_EXTENDED) != 0) { + /* Warn unable to generate match particular string. */ + pr_info("Invalid regular expression %s\n", map->cpuid); break; + } + + match = !regexec(&re, cpuid, 1, pmatch, 0); + regfree(&re); + if (match) { + size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so); + + /* Verify the entire string matched. */ + if (match_len == strlen(cpuid)) + break; + } } free(cpuid); return map; -- cgit v1.2.3