From c315669e2fbd71bb9387066f60f0d91b0ceb28f3 Mon Sep 17 00:00:00 2001 From: Athira Rajeev Date: Thu, 27 Jan 2022 12:49:54 +0530 Subject: selftests/powerpc/pmu: Add support for perf sampling tests Add support functions for enabling perf sampling test in a new folder "sampling_tests" under "selftests/powerpc/pmu". This includes support functions for allocating and processing the mmap buffer. These functions are added/defined in "sampling_tests/misc.*" files. Also updates the corresponding Makefiles in "selftests/powerpc" and "sampling_tests" folder. Signed-off-by: Athira Rajeev [mpe: Drop unneeded bits from the Makefile] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220127072012.662451-3-kjain@linux.ibm.com --- tools/testing/selftests/powerpc/pmu/Makefile | 11 ++- .../selftests/powerpc/pmu/sampling_tests/Makefile | 7 ++ .../selftests/powerpc/pmu/sampling_tests/misc.c | 105 +++++++++++++++++++++ .../selftests/powerpc/pmu/sampling_tests/misc.h | 9 ++ 4 files changed, 130 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h (limited to 'tools/testing') diff --git a/tools/testing/selftests/powerpc/pmu/Makefile b/tools/testing/selftests/powerpc/pmu/Makefile index 904672fb78dd..edbd96d3b2ab 100644 --- a/tools/testing/selftests/powerpc/pmu/Makefile +++ b/tools/testing/selftests/powerpc/pmu/Makefile @@ -8,7 +8,7 @@ EXTRA_SOURCES := ../harness.c event.c lib.c ../utils.c top_srcdir = ../../../../.. include ../../lib.mk -all: $(TEST_GEN_PROGS) ebb +all: $(TEST_GEN_PROGS) ebb sampling_tests $(TEST_GEN_PROGS): $(EXTRA_SOURCES) @@ -26,25 +26,32 @@ DEFAULT_RUN_TESTS := $(RUN_TESTS) override define RUN_TESTS $(DEFAULT_RUN_TESTS) TARGET=ebb; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests + TARGET=sampling_tests; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET run_tests endef DEFAULT_EMIT_TESTS := $(EMIT_TESTS) override define EMIT_TESTS $(DEFAULT_EMIT_TESTS) TARGET=ebb; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -s -C $$TARGET emit_tests + TARGET=sampling_tests; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -s -C $$TARGET emit_tests endef DEFAULT_INSTALL_RULE := $(INSTALL_RULE) override define INSTALL_RULE $(DEFAULT_INSTALL_RULE) TARGET=ebb; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET install + TARGET=sampling_tests; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET install endef clean: $(RM) $(TEST_GEN_PROGS) $(OUTPUT)/loop.o TARGET=ebb; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET clean + TARGET=sampling_tests; BUILD_TARGET=$$OUTPUT/$$TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET clean ebb: TARGET=$@; BUILD_TARGET=$$OUTPUT/$$TARGET; mkdir -p $$BUILD_TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -k -C $$TARGET all -.PHONY: all run_tests clean ebb +sampling_tests: + TARGET=$@; BUILD_TARGET=$$OUTPUT/$$TARGET; mkdir -p $$BUILD_TARGET; $(MAKE) OUTPUT=$$BUILD_TARGET -k -C $$TARGET all + +.PHONY: all run_tests clean ebb sampling_tests diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile new file mode 100644 index 000000000000..ac3d03ffc428 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +CFLAGS += -m64 + +top_srcdir = ../../../../../.. +include ../../../lib.mk + +$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c new file mode 100644 index 000000000000..4779b107f43b --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c @@ -0,0 +1,105 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Athira Rajeev, IBM Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "misc.h" + +#define PAGE_SIZE sysconf(_SC_PAGESIZE) + +/* + * Allocate mmap buffer of "mmap_pages" number of + * pages. + */ +void *event_sample_buf_mmap(int fd, int mmap_pages) +{ + size_t page_size = sysconf(_SC_PAGESIZE); + size_t mmap_size; + void *buff; + + if (mmap_pages <= 0) + return NULL; + + if (fd <= 0) + return NULL; + + mmap_size = page_size * (1 + mmap_pages); + buff = mmap(NULL, mmap_size, + PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + + if (buff == MAP_FAILED) { + perror("mmap() failed."); + return NULL; + } + return buff; +} + +/* + * Post process the mmap buffer. + * - If sample_count != NULL then return count of total + * number of samples present in the mmap buffer. + * - If sample_count == NULL then return the address + * of first sample from the mmap buffer + */ +void *__event_read_samples(void *sample_buff, size_t *size, u64 *sample_count) +{ + size_t page_size = sysconf(_SC_PAGESIZE); + struct perf_event_header *header = sample_buff + page_size; + struct perf_event_mmap_page *metadata_page = sample_buff; + unsigned long data_head, data_tail; + + /* + * PERF_RECORD_SAMPLE: + * struct { + * struct perf_event_header hdr; + * u64 data[]; + * }; + */ + + data_head = metadata_page->data_head; + /* sync memory before reading sample */ + mb(); + data_tail = metadata_page->data_tail; + + /* Check for sample_count */ + if (sample_count) + *sample_count = 0; + + while (1) { + /* + * Reads the mmap data buffer by moving + * the data_tail to know the last read data. + * data_head points to head in data buffer. + * refer "struct perf_event_mmap_page" in + * "include/uapi/linux/perf_event.h". + */ + if (data_head - data_tail < sizeof(header)) + return NULL; + + data_tail += sizeof(header); + if (header->type == PERF_RECORD_SAMPLE) { + *size = (header->size - sizeof(header)); + if (!sample_count) + return sample_buff + page_size + data_tail; + data_tail += *size; + *sample_count += 1; + } else { + *size = (header->size - sizeof(header)); + if ((metadata_page->data_tail + *size) > metadata_page->data_head) + data_tail = metadata_page->data_head; + else + data_tail += *size; + } + header = (struct perf_event_header *)((void *)header + header->size); + } + return NULL; +} diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h new file mode 100644 index 000000000000..291f9adba817 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2022, Athira Rajeev, IBM Corp. + */ + +#include "../event.h" + +void *event_sample_buf_mmap(int fd, int mmap_pages); +void *__event_read_samples(void *sample_buff, size_t *size, u64 *sample_count); -- cgit v1.2.3-59-g8ed1b