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[2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab2c90d6838sm506052766b.55.2025.01.13.04.42.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jan 2025 04:42:54 -0800 (PST) Date: Mon, 13 Jan 2025 13:42:53 +0100 From: Andrew Jones To: yunhui cui Cc: alexghiti@rivosinc.com, andybnac@gmail.com, aou@eecs.berkeley.edu, charlie@rivosinc.com, cleger@rivosinc.com, conor.dooley@microchip.com, conor@kernel.org, corbet@lwn.net, evan@rivosinc.com, jesse@rivosinc.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, paul.walmsley@sifive.com, samuel.holland@sifive.com, shuah@kernel.org Subject: Re: [External] Re: [PATCH v3 3/3] RISC-V: selftests: Add TEST_ZICBOM into CBO tests Message-ID: <20250113-28a67adb2827a1adea1c714d@orel> References: <20250113083635.73826-1-cuiyunhui@bytedance.com> <20250113083635.73826-3-cuiyunhui@bytedance.com> <20250113-cb08bcb35bc8b6213fe89ecd@orel> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Jan 13, 2025 at 07:49:39PM +0800, yunhui cui wrote: > Hi drew, > > On Mon, Jan 13, 2025 at 5:18 PM Andrew Jones wrote: > > > > On Mon, Jan 13, 2025 at 04:36:35PM +0800, Yunhui Cui wrote: > > > Add test for Zicbom and its block size into CBO tests, when > > > Zicbom is present, test that cbo.clean/flush may be issued and works. > > > As the software can't verify the clean/flush functions, we just judged > > > that cbo.clean/flush isn't executed illegally. > > > > > > Signed-off-by: Yunhui Cui > > > --- > > > tools/testing/selftests/riscv/hwprobe/cbo.c | 49 ++++++++++++++++++--- > > > 1 file changed, 43 insertions(+), 6 deletions(-) > > > > > > diff --git a/tools/testing/selftests/riscv/hwprobe/cbo.c b/tools/testing/selftests/riscv/hwprobe/cbo.c > > > index a40541bb7c7d..b63e23f95e08 100644 > > > --- a/tools/testing/selftests/riscv/hwprobe/cbo.c > > > +++ b/tools/testing/selftests/riscv/hwprobe/cbo.c > > > @@ -81,6 +81,30 @@ static bool is_power_of_2(__u64 n) > > > return n != 0 && (n & (n - 1)) == 0; > > > } > > > > > > +static void test_zicbom(void *arg) > > > +{ > > > + struct riscv_hwprobe pair = { > > > + .key = RISCV_HWPROBE_KEY_ZICBOM_BLOCK_SIZE, > > > + }; > > > + cpu_set_t *cpus = (cpu_set_t *)arg; > > > + __u64 block_size; > > > + long rc; > > > + > > > + rc = riscv_hwprobe(&pair, 1, sizeof(cpu_set_t), (unsigned long *)cpus, 0); > > > + block_size = pair.value; > > > + ksft_test_result(rc == 0 && pair.key == RISCV_HWPROBE_KEY_ZICBOM_BLOCK_SIZE && > > > + is_power_of_2(block_size), "Zicbom block size\n"); > > > + ksft_print_msg("Zicbom block size: %llu\n", block_size); > > > + > > > + illegal_insn = false; > > > + cbo_clean(&mem[block_size]); > > > + ksft_test_result(!illegal_insn, "cbo.clean\n"); > > > + > > > + illegal_insn = false; > > > + cbo_flush(&mem[block_size]); > > > + ksft_test_result(!illegal_insn, "cbo.flush\n"); > > > +} > > > + > > > static void test_zicboz(void *arg) > > > { > > > struct riscv_hwprobe pair = { > > > @@ -129,7 +153,7 @@ static void test_zicboz(void *arg) > > > ksft_test_result_pass("cbo.zero check\n"); > > > } > > > > > > -static void check_no_zicboz_cpus(cpu_set_t *cpus) > > > +static void check_no_zicbo_cpus(cpu_set_t *cpus, __u64 cbo) > > > { > > > struct riscv_hwprobe pair = { > > > .key = RISCV_HWPROBE_KEY_IMA_EXT_0, > > > @@ -137,6 +161,7 @@ static void check_no_zicboz_cpus(cpu_set_t *cpus) > > > cpu_set_t one_cpu; > > > int i = 0, c = 0; > > > long rc; > > > + char *cbostr; > > > > > > while (i++ < CPU_COUNT(cpus)) { > > > while (!CPU_ISSET(c, cpus)) > > > @@ -148,10 +173,13 @@ static void check_no_zicboz_cpus(cpu_set_t *cpus) > > > rc = riscv_hwprobe(&pair, 1, sizeof(cpu_set_t), (unsigned long *)&one_cpu, 0); > > > assert(rc == 0 && pair.key == RISCV_HWPROBE_KEY_IMA_EXT_0); > > > > > > - if (pair.value & RISCV_HWPROBE_EXT_ZICBOZ) > > > - ksft_exit_fail_msg("Zicboz is only present on a subset of harts.\n" > > > - "Use taskset to select a set of harts where Zicboz\n" > > > - "presence (present or not) is consistent for each hart\n"); > > > + cbostr = cbo == RISCV_HWPROBE_EXT_ZICBOZ ? "Zicboz" : "Zicbom"; > > > + > > > + if (pair.value & cbo) > > > + ksft_exit_fail_msg("%s is only present on a subset of harts.\n" > > > + "Use taskset to select a set of harts where %s\n" > > > + "presence (present or not) is consistent for each hart\n", > > > + cbostr, cbostr); > > > ++c; > > > } > > > } > > > @@ -159,6 +187,7 @@ static void check_no_zicboz_cpus(cpu_set_t *cpus) > > > enum { > > > TEST_ZICBOZ, > > > TEST_NO_ZICBOZ, > > > + TEST_ZICBOM, > > > TEST_NO_ZICBOM, > > > }; > > > > > > @@ -169,6 +198,7 @@ static struct test_info { > > > } tests[] = { > > > [TEST_ZICBOZ] = { .nr_tests = 3, test_zicboz }, > > > [TEST_NO_ZICBOZ] = { .nr_tests = 1, test_no_zicboz }, > > > + [TEST_ZICBOM] = { .nr_tests = 3, test_zicbom }, > > > [TEST_NO_ZICBOM] = { .nr_tests = 3, test_no_zicbom }, > > > }; > > > > > > @@ -206,7 +236,14 @@ int main(int argc, char **argv) > > > tests[TEST_ZICBOZ].enabled = true; > > > tests[TEST_NO_ZICBOZ].enabled = false; > > > } else { > > > - check_no_zicboz_cpus(&cpus); > > > + check_no_zicbo_cpus(&cpus, RISCV_HWPROBE_EXT_ZICBOZ); > > > + } > > > + > > > + if (pair.value & RISCV_HWPROBE_EXT_ZICBOM) { > > > + tests[TEST_ZICBOM].enabled = true; > > > + tests[TEST_NO_ZICBOM].enabled = false; > > > + } else { > > > + check_no_zicbo_cpus(&cpus, RISCV_HWPROBE_EXT_ZICBOM); > > > } > > > > > > for (i = 0; i < ARRAY_SIZE(tests); ++i) > > > -- > > > 2.39.2 > > > > > > > The test_no_zicbom() test needs to have the illegal instruction SIGILL > > test for cbo.inval moved out into its own test. So, even when we have > > zicbom we still test that cbo.inval generates a SIGILL. > > Do you mean moving cbo_inval() into test_zicbom()? Then does > cbo_inval(&mem[0]) also need to be tested in test_no_zicbom()? No, I'd create a new test named test_no_cbo_inval(), which should always run regardless of zicbom/zicboz detection. 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[2001:1ae9:1c2:4c00:20f:c6b4:1e57:7965]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab2c90d6838sm506052766b.55.2025.01.13.04.42.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jan 2025 04:42:54 -0800 (PST) Date: Mon, 13 Jan 2025 13:42:53 +0100 From: Andrew Jones To: yunhui cui Cc: alexghiti@rivosinc.com, andybnac@gmail.com, aou@eecs.berkeley.edu, charlie@rivosinc.com, cleger@rivosinc.com, conor.dooley@microchip.com, conor@kernel.org, corbet@lwn.net, evan@rivosinc.com, jesse@rivosinc.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, paul.walmsley@sifive.com, samuel.holland@sifive.com, shuah@kernel.org Subject: Re: [External] Re: [PATCH v3 3/3] RISC-V: selftests: Add TEST_ZICBOM into CBO tests Message-ID: <20250113-28a67adb2827a1adea1c714d@orel> References: <20250113083635.73826-1-cuiyunhui@bytedance.com> <20250113083635.73826-3-cuiyunhui@bytedance.com> 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