perf test pmu: Refactor format test and exposed test APIs
In tests/pmu.c, make a common utility that creates a PMU in a mkdtemp directory and uses regular PMU parsing logic to load that PMU. Formats must still be eagerly loaded as by default the PMU code assumes devices are going to be in sysfs. In util/pmu.[ch], hide perf_pmu__format_parse but add the eager argument to perf_pmu__lookup called by perf_pmus__add_test_pmu. Later patches will eagerly load other non-sysfs files when eager loading is enabled. In tests/pmu.c, rather than manually constructing a list of term arguments, just use the term parsing code from a string. Add more comments and debug logging. Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Ian Rogers <irogers@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Link: https://lore.kernel.org/r/20240502213507.2339733-4-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers
Arnaldo Carvalho de Melo
parent
785623ee85
commit
aa1551f299
@ -2,203 +2,186 @@
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#include "parse-events.h"
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#include "pmu.h"
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#include "tests.h"
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#include "debug.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <linux/kernel.h>
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#include <linux/limits.h>
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#include <linux/zalloc.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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/* Simulated format definitions. */
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static struct test_format {
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const char *name;
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const char *value;
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} test_formats[] = {
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{ "krava01", "config:0-1,62-63\n", },
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{ "krava02", "config:10-17\n", },
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{ "krava03", "config:5\n", },
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{ "krava11", "config1:0,2,4,6,8,20-28\n", },
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{ "krava12", "config1:63\n", },
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{ "krava13", "config1:45-47\n", },
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{ "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
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{ "krava22", "config2:8,18,48,58\n", },
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{ "krava23", "config2:28-29,38\n", },
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};
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/* Fake PMUs created in temp directory. */
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static LIST_HEAD(test_pmus);
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/* Simulated users input. */
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static struct parse_events_term test_terms[] = {
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{
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.config = "krava01",
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.val.num = 15,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava02",
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.val.num = 170,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava03",
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.val.num = 1,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava11",
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.val.num = 27,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava12",
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.val.num = 1,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava13",
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.val.num = 2,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava21",
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.val.num = 119,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava22",
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.val.num = 11,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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{
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.config = "krava23",
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.val.num = 2,
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.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
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.type_term = PARSE_EVENTS__TERM_TYPE_USER,
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},
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};
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/*
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* Prepare format directory data, exported by kernel
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* at /sys/bus/event_source/devices/<dev>/format.
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*/
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static char *test_format_dir_get(char *dir, size_t sz)
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{
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unsigned int i;
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snprintf(dir, sz, "/tmp/perf-pmu-test-format-XXXXXX");
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if (!mkdtemp(dir))
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return NULL;
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for (i = 0; i < ARRAY_SIZE(test_formats); i++) {
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char name[PATH_MAX];
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struct test_format *format = &test_formats[i];
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FILE *file;
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scnprintf(name, PATH_MAX, "%s/%s", dir, format->name);
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file = fopen(name, "w");
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if (!file)
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return NULL;
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if (1 != fwrite(format->value, strlen(format->value), 1, file))
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break;
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fclose(file);
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}
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return dir;
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}
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/* Cleanup format directory. */
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static int test_format_dir_put(char *dir)
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/* Cleanup test PMU directory. */
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static int test_pmu_put(const char *dir, struct perf_pmu *pmu)
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{
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char buf[PATH_MAX + 20];
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snprintf(buf, sizeof(buf), "rm -f %s/*\n", dir);
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if (system(buf))
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return -1;
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snprintf(buf, sizeof(buf), "rmdir %s\n", dir);
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return system(buf);
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}
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static void add_test_terms(struct parse_events_terms *terms)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(test_terms); i++) {
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struct parse_events_term *clone;
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parse_events_term__clone(&clone, &test_terms[i]);
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list_add_tail(&clone->list, &terms->terms);
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}
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}
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static int test__pmu(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
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{
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char dir[PATH_MAX];
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char *format;
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struct parse_events_terms terms;
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struct perf_event_attr attr;
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struct perf_pmu *pmu;
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int fd;
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int ret;
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parse_events_terms__init(&terms);
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add_test_terms(&terms);
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pmu = zalloc(sizeof(*pmu));
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if (!pmu) {
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parse_events_terms__exit(&terms);
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return -ENOMEM;
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}
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INIT_LIST_HEAD(&pmu->format);
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INIT_LIST_HEAD(&pmu->aliases);
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INIT_LIST_HEAD(&pmu->caps);
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format = test_format_dir_get(dir, sizeof(dir));
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if (!format) {
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free(pmu);
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parse_events_terms__exit(&terms);
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if (scnprintf(buf, sizeof(buf), "rm -fr %s", dir) < 0) {
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pr_err("Failure to set up buffer for \"%s\"\n", dir);
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return -EINVAL;
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}
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memset(&attr, 0, sizeof(attr));
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fd = open(format, O_DIRECTORY);
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if (fd < 0) {
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ret = fd;
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goto out;
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}
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pmu->name = strdup("perf-pmu-test");
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ret = perf_pmu__format_parse(pmu, fd, /*eager_load=*/true);
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ret = system(buf);
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if (ret)
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goto out;
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pr_err("Failure to \"%s\"\n", buf);
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ret = perf_pmu__config_terms(pmu, &attr, &terms, /*zero=*/false, /*err=*/NULL);
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if (ret)
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goto out;
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ret = -EINVAL;
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if (attr.config != 0xc00000000002a823)
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goto out;
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if (attr.config1 != 0x8000400000000145)
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goto out;
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if (attr.config2 != 0x0400000020041d07)
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goto out;
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ret = 0;
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out:
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test_format_dir_put(format);
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list_del(&pmu->list);
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perf_pmu__delete(pmu);
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parse_events_terms__exit(&terms);
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return ret;
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}
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DEFINE_SUITE("Parse perf pmu format", pmu);
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/*
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* Prepare test PMU directory data, normally exported by kernel at
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* /sys/bus/event_source/devices/<pmu>/. Give as input a buffer to hold the file
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* path, the result is PMU loaded using that directory.
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*/
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static struct perf_pmu *test_pmu_get(char *dir, size_t sz)
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{
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/* Simulated format definitions. */
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const struct test_format {
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const char *name;
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const char *value;
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} test_formats[] = {
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{ "krava01", "config:0-1,62-63\n", },
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{ "krava02", "config:10-17\n", },
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{ "krava03", "config:5\n", },
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{ "krava11", "config1:0,2,4,6,8,20-28\n", },
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{ "krava12", "config1:63\n", },
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{ "krava13", "config1:45-47\n", },
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{ "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
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{ "krava22", "config2:8,18,48,58\n", },
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{ "krava23", "config2:28-29,38\n", },
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};
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char name[PATH_MAX];
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int dirfd, file;
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struct perf_pmu *pmu = NULL;
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ssize_t len;
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/* Create equivalent of sysfs mount point. */
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scnprintf(dir, sz, "/tmp/perf-pmu-test-XXXXXX");
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if (!mkdtemp(dir)) {
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pr_err("mkdtemp failed\n");
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dir[0] = '\0';
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return NULL;
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}
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dirfd = open(dir, O_DIRECTORY);
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if (dirfd < 0) {
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pr_err("Failed to open test directory \"%s\"\n", dir);
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goto err_out;
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}
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/* Create the test PMU directory and give it a perf_event_attr type number. */
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if (mkdirat(dirfd, "perf-pmu-test", 0755) < 0) {
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pr_err("Failed to mkdir PMU directory\n");
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goto err_out;
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}
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file = openat(dirfd, "perf-pmu-test/type", O_WRONLY | O_CREAT, 0600);
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if (!file) {
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pr_err("Failed to open for writing file \"type\"\n");
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goto err_out;
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}
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len = strlen("9999");
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if (write(file, "9999\n", len) < len) {
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close(file);
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pr_err("Failed to write to 'type' file\n");
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goto err_out;
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}
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close(file);
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/* Create format directory and files. */
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if (mkdirat(dirfd, "perf-pmu-test/format", 0755) < 0) {
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pr_err("Failed to mkdir PMU format directory\n)");
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goto err_out;
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}
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for (size_t i = 0; i < ARRAY_SIZE(test_formats); i++) {
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const struct test_format *format = &test_formats[i];
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if (scnprintf(name, PATH_MAX, "perf-pmu-test/format/%s", format->name) < 0) {
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pr_err("Failure to set up path for \"%s\"\n", format->name);
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goto err_out;
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}
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file = openat(dirfd, name, O_WRONLY | O_CREAT, 0600);
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if (!file) {
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pr_err("Failed to open for writing file \"%s\"\n", name);
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goto err_out;
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}
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if (write(file, format->value, strlen(format->value)) < 0) {
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pr_err("Failed to write to file \"%s\"\n", name);
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close(file);
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goto err_out;
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}
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close(file);
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}
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/* Make the PMU reading the files created above. */
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pmu = perf_pmus__add_test_pmu(dirfd, "perf-pmu-test");
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if (!pmu)
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pr_err("Test PMU creation failed\n");
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err_out:
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if (!pmu)
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test_pmu_put(dir, pmu);
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if (dirfd >= 0)
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close(dirfd);
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return pmu;
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}
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static int test__pmu_format(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
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{
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char dir[PATH_MAX];
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struct perf_event_attr attr;
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struct parse_events_terms terms;
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int ret = TEST_FAIL;
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struct perf_pmu *pmu = test_pmu_get(dir, sizeof(dir));
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if (!pmu)
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return TEST_FAIL;
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parse_events_terms__init(&terms);
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if (parse_events_terms(&terms,
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"krava01=15,krava02=170,krava03=1,krava11=27,krava12=1,"
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"krava13=2,krava21=119,krava22=11,krava23=2",
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NULL)) {
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pr_err("Term parsing failed\n");
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goto err_out;
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}
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memset(&attr, 0, sizeof(attr));
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ret = perf_pmu__config_terms(pmu, &attr, &terms, /*zero=*/false, /*err=*/NULL);
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if (ret) {
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pr_err("perf_pmu__config_terms failed");
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goto err_out;
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}
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if (attr.config != 0xc00000000002a823) {
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pr_err("Unexpected config value %llx\n", attr.config);
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goto err_out;
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}
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if (attr.config1 != 0x8000400000000145) {
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pr_err("Unexpected config1 value %llx\n", attr.config1);
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goto err_out;
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}
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if (attr.config2 != 0x0400000020041d07) {
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pr_err("Unexpected config2 value %llx\n", attr.config2);
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goto err_out;
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}
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ret = TEST_OK;
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err_out:
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parse_events_terms__exit(&terms);
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test_pmu_put(dir, pmu);
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return ret;
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}
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static struct test_case tests__pmu[] = {
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TEST_CASE("Parsing with PMU format directory", pmu_format),
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{ .name = NULL, }
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};
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struct test_suite suite__pmu = {
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.desc = "Sysfs PMU tests",
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.test_cases = tests__pmu,
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};
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@ -2585,7 +2585,7 @@ int parse_events_term__term(struct parse_events_term **term,
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}
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int parse_events_term__clone(struct parse_events_term **new,
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struct parse_events_term *term)
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const struct parse_events_term *term)
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{
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char *str;
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struct parse_events_term temp = *term;
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@ -178,7 +178,7 @@ int parse_events_term__term(struct parse_events_term **term,
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enum parse_events__term_type term_rhs,
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void *loc_term, void *loc_val);
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int parse_events_term__clone(struct parse_events_term **new,
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struct parse_events_term *term);
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const struct parse_events_term *term);
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void parse_events_term__delete(struct parse_events_term *term);
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void parse_events_terms__delete(struct parse_events_terms *terms);
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@ -182,7 +182,7 @@ static void perf_pmu_format__load(const struct perf_pmu *pmu, struct perf_pmu_fo
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* Parse & process all the sysfs attributes located under
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* the directory specified in 'dir' parameter.
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*/
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int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load)
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static int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load)
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{
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struct dirent *evt_ent;
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DIR *format_dir;
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@ -232,7 +232,7 @@ int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load)
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* located at:
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* /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
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*/
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static int pmu_format(struct perf_pmu *pmu, int dirfd, const char *name)
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static int pmu_format(struct perf_pmu *pmu, int dirfd, const char *name, bool eager_load)
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{
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int fd;
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@ -241,7 +241,7 @@ static int pmu_format(struct perf_pmu *pmu, int dirfd, const char *name)
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return 0;
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/* it'll close the fd */
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if (perf_pmu__format_parse(pmu, fd, /*eager_load=*/false))
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if (perf_pmu__format_parse(pmu, fd, eager_load))
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return -1;
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return 0;
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@ -994,7 +994,8 @@ perf_pmu__arch_init(struct perf_pmu *pmu)
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pmu->mem_events = perf_mem_events;
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}
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struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *name)
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struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *name,
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bool eager_load)
|
||||
{
|
||||
struct perf_pmu *pmu;
|
||||
__u32 type;
|
||||
@ -1023,7 +1024,7 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
|
||||
* type value and format definitions. Load both right
|
||||
* now.
|
||||
*/
|
||||
if (pmu_format(pmu, dirfd, name))
|
||||
if (pmu_format(pmu, dirfd, name, eager_load))
|
||||
goto err;
|
||||
|
||||
pmu->is_core = is_pmu_core(name);
|
||||
|
||||
@ -214,7 +214,6 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct parse_events_terms *head_
|
||||
struct parse_events_error *err);
|
||||
int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, pmu_event_callback cb);
|
||||
|
||||
int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load);
|
||||
void perf_pmu_format__set_value(void *format, int config, unsigned long *bits);
|
||||
bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name);
|
||||
int perf_pmu__for_each_format(struct perf_pmu *pmu, void *state, pmu_format_callback cb);
|
||||
@ -272,7 +271,8 @@ int perf_pmu__pathname_scnprintf(char *buf, size_t size,
|
||||
int perf_pmu__event_source_devices_fd(void);
|
||||
int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags);
|
||||
|
||||
struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name);
|
||||
struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name,
|
||||
bool eager_load);
|
||||
struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus);
|
||||
void perf_pmu__delete(struct perf_pmu *pmu);
|
||||
struct perf_pmu *perf_pmus__find_core_pmu(void);
|
||||
|
||||
@ -124,7 +124,8 @@ struct perf_pmu *perf_pmus__find(const char *name)
|
||||
return NULL;
|
||||
|
||||
dirfd = perf_pmu__event_source_devices_fd();
|
||||
pmu = perf_pmu__lookup(core_pmu ? &core_pmus : &other_pmus, dirfd, name);
|
||||
pmu = perf_pmu__lookup(core_pmu ? &core_pmus : &other_pmus, dirfd, name,
|
||||
/*eager_load=*/false);
|
||||
close(dirfd);
|
||||
|
||||
if (!pmu) {
|
||||
@ -159,7 +160,8 @@ static struct perf_pmu *perf_pmu__find2(int dirfd, const char *name)
|
||||
if (core_pmu && read_sysfs_core_pmus)
|
||||
return NULL;
|
||||
|
||||
return perf_pmu__lookup(core_pmu ? &core_pmus : &other_pmus, dirfd, name);
|
||||
return perf_pmu__lookup(core_pmu ? &core_pmus : &other_pmus, dirfd, name,
|
||||
/*eager_load=*/false);
|
||||
}
|
||||
|
||||
static int pmus_cmp(void *priv __maybe_unused,
|
||||
@ -696,3 +698,13 @@ struct perf_pmu *perf_pmus__find_core_pmu(void)
|
||||
{
|
||||
return perf_pmus__scan_core(NULL);
|
||||
}
|
||||
|
||||
struct perf_pmu *perf_pmus__add_test_pmu(int test_sysfs_dirfd, const char *name)
|
||||
{
|
||||
/*
|
||||
* Some PMU functions read from the sysfs mount point, so care is
|
||||
* needed, hence passing the eager_load flag to load things like the
|
||||
* format files.
|
||||
*/
|
||||
return perf_pmu__lookup(&other_pmus, test_sysfs_dirfd, name, /*eager_load=*/true);
|
||||
}
|
||||
|
||||
@ -24,4 +24,6 @@ int perf_pmus__num_core_pmus(void);
|
||||
bool perf_pmus__supports_extended_type(void);
|
||||
char *perf_pmus__default_pmu_name(void);
|
||||
|
||||
struct perf_pmu *perf_pmus__add_test_pmu(int test_sysfs_dirfd, const char *name);
|
||||
|
||||
#endif /* __PMUS_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user