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Thu, 27 Jan 2022 07:21:09 +0000 (GMT) From: Kajol Jain To: mpe@ellerman.id.au Subject: [PATCH 09/20] selftest/powerpc/pmu/: Add interface test for mmcr0 exception bits Date: Thu, 27 Jan 2022 12:50:01 +0530 Message-Id: <20220127072012.662451-10-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 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: QJAc-rVdBQg1cpvf-JYqFiP9bv-w7Mb0 X-Proofpoint-GUID: QJAc-rVdBQg1cpvf-JYqFiP9bv-w7Mb0 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 lowpriorityscore=0 spamscore=0 mlxscore=0 clxscore=1015 adultscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 priorityscore=1501 phishscore=0 suspectscore=0 malwarescore=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+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Athira Rajeev The testcase uses "instructions" event to verify two bits(PMAE and PMAO) in Monitor Mode Control Register 0 (MMCR0). At the time of interrupt, pmae bit ( which enables performance monitor exception ) is expected to be cleared and pmao (which indicates performance monitor alert) bit is expected to be set in MMCR0. And testcases handles these checks. Signed-off-by: Athira Rajeev --- .../powerpc/pmu/sampling_tests/Makefile | 6 +- .../sampling_tests/mmcr0_exceptionbits_test.c | 59 +++++++++++++++++++ 2 files changed, 63 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile index eb00c9f931ec..aee25c7037ac 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 include ../../../../../../scripts/Kbuild.include -all: $(TEST_GEN_PROGS) +all: $(TEST_GEN_PROGS) mmcr0_exceptionbits_test.c noarg: $(MAKE) -C ../../ @@ -12,9 +12,11 @@ CFLAGS += -m64 -I../../../../../lib/ 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) +TEST_GEN_PROGS := mmcr0_exceptionbits_test + LDFLAGS += $(no-pie-option) top_srcdir = ../../../../../.. include ../../../lib.mk -$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h +$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h ../loop.S diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c new file mode 100644 index 000000000000..4de0b40264c9 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Athira Rajeev, IBM Corp. + */ + +#include +#include + +#include "../event.h" +#include "misc.h" +#include "utils.h" + +extern void thirty_two_instruction_loop(int loops); + +/* + * A perf sampling test for mmcr0 + * fields : pmae, pmao. + */ +static int mmcr0_exceptionbits(void) +{ + struct event event; + u64 *intr_regs; + + /* Check for platform support for the test */ + SKIP_IF(check_pvr_for_sampling_tests()); + + /* Init the event for the sampling test */ + event_init_sampling(&event, 0x500fa); + event.attr.sample_regs_intr = platform_extended_mask; + FAIL_IF(event_open(&event)); + event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); + + event_enable(&event); + + /* workload to make the event overflow */ + thirty_two_instruction_loop(10000); + + event_disable(&event); + + /* Check for sample count */ + FAIL_IF(!collect_samples(event.mmap_buffer)); + + intr_regs = get_intr_regs(&event, event.mmap_buffer); + + /* Check for intr_regs */ + FAIL_IF(!intr_regs); + + /* Verify that pmae is cleared and pmao is set in MMCR0 */ + FAIL_IF(GET_MMCR_FIELD(0, get_reg_value(intr_regs, "MMCR0"), 5, pmae)); + FAIL_IF(!GET_MMCR_FIELD(0, get_reg_value(intr_regs, "MMCR0"), 5, pmao)); + + event_close(&event); + return 0; +} + +int main(void) +{ + FAIL_IF(test_harness(mmcr0_exceptionbits, "mmcr0_exceptionbits")); +} -- 2.27.0