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Thu, 27 Jan 2022 07:20:50 +0000 (GMT) Received: from li-e8dccbcc-2adc-11b2-a85c-bc1f33b9b810.ibm.com.com (unknown [9.43.106.251]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 27 Jan 2022 07:20:50 +0000 (GMT) From: Kajol Jain To: mpe@ellerman.id.au Subject: [PATCH 02/20] selftest/powerpc/pmu: Add support for perf sampling tests Date: Thu, 27 Jan 2022 12:49:54 +0530 Message-Id: <20220127072012.662451-3-kjain@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220127072012.662451-1-kjain@linux.ibm.com> References: <20220127072012.662451-1-kjain@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: d5aOacdUzSvsc8UPnv-8vyt_fJCOQalz X-Proofpoint-ORIG-GUID: d5aOacdUzSvsc8UPnv-8vyt_fJCOQalz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-27_02,2022-01-26_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 mlxscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 impostorscore=0 phishscore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2201270040 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kjain@linux.ibm.com, atrajeev@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, rnsastry@linux.ibm.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Athira Rajeev 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 --- tools/testing/selftests/powerpc/pmu/Makefile | 11 +- .../powerpc/pmu/sampling_tests/Makefile | 20 ++++ .../powerpc/pmu/sampling_tests/misc.c | 105 ++++++++++++++++++ .../powerpc/pmu/sampling_tests/misc.h | 9 ++ 4 files changed, 143 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 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..eb00c9f931ec --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0 +include ../../../../../../scripts/Kbuild.include + +all: $(TEST_GEN_PROGS) + +noarg: + $(MAKE) -C ../../ + +CFLAGS += -m64 -I../../../../../lib/ + +# Toolchains may build PIE by default which breaks the assembly +no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \ + $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie) + +LDFLAGS += $(no-pie-option) + +top_srcdir = ../../../../../.. +include ../../../lib.mk + +$(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);