Messages in this thread Patch in this message | | | From | Meng Li <> | Subject | [PATCH 3/3] selftests: cpufreq: Add amd_pstate_testmod kernel module for testing | Date | Wed, 13 Apr 2022 17:05:10 +0800 |
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Add amd_pstate_testmod module, which is conceptually out-of-tree module and provides ways for selftests/cpufreq amd pstate driver to test various kernel module-related functionality. This module will be expected by some of selftests to be present and loaded.
Signed-off-by: Meng Li <li.meng@amd.com> --- .../cpufreq/amd_pstate_testmod/Makefile | 20 ++ .../amd_pstate_testmod/amd_pstate_testmod.c | 302 ++++++++++++++++++ 2 files changed, 322 insertions(+) create mode 100644 tools/testing/selftests/cpufreq/amd_pstate_testmod/Makefile create mode 100644 tools/testing/selftests/cpufreq/amd_pstate_testmod/amd_pstate_testmod.c
diff --git a/tools/testing/selftests/cpufreq/amd_pstate_testmod/Makefile b/tools/testing/selftests/cpufreq/amd_pstate_testmod/Makefile new file mode 100644 index 000000000000..8a5596cb2c18 --- /dev/null +++ b/tools/testing/selftests/cpufreq/amd_pstate_testmod/Makefile @@ -0,0 +1,20 @@ +AMD_PSTATE_TESTMOD_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST))))) +KDIR ?= $(abspath $(AMD_PSATE_TESTMOD_DIR)/../../../../..) + +ifeq ($(V),1) +Q = +else +Q = @ +endif + +MODULES = amd_pstate_testmod.ko + +obj-m += amd_pstate_testmod.o +CFLAGS_amd_pstate_testmod.o = -I$(src) + +all: + +$(Q)make -C $(KDIR) M=$(AMD_PSTATE_TESTMOD_DIR) modules + +clean: + +$(Q)make -C $(KDIR) M=$(AMD_PSTATE_TESTMOD_DIR) clean + diff --git a/tools/testing/selftests/cpufreq/amd_pstate_testmod/amd_pstate_testmod.c b/tools/testing/selftests/cpufreq/amd_pstate_testmod/amd_pstate_testmod.c new file mode 100644 index 000000000000..a892cecf19da --- /dev/null +++ b/tools/testing/selftests/cpufreq/amd_pstate_testmod/amd_pstate_testmod.c @@ -0,0 +1,302 @@ +// SPDX-License-Identifier: GPL-1.0-or-later +/* + * AMD Processor P-state Frequency Driver Unit Test + * + * Copyright (C) 2022 Advanced Micro Devices, Inc. All Rights Reserved. + * + * Author: Meng Li <li.meng@amd.com> + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include "../../kselftest_module.h" + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/fs.h> +#include <linux/amd-pstate.h> + +#include <acpi/cppc_acpi.h> + +/* + * Abbreviations: + * aput: used as a shortform for AMD P-State unit test. + * It helps to keep variable names smaller, simpler +*/ + +KSTM_MODULE_GLOBALS(); + +/* + * Kernel module for testing the AMD P-State unit test + */ +enum aput_result { + APUT_RESULT_PASS, //0 + APUT_RESULT_FAIL, // + MAX_APUT_RESULT, +}; + +struct aput_struct { + const char *name; + void (*func)(u32 index); + enum aput_result result; +}; + +static void aput_x86_vendor(u32 index); +static void aput_acpi_cpc(u32 index); +static void aput_modprobed_driver(u32 index); +static void aput_capability_check(u32 index); +static void aput_enable(u32 index); +static void aput_init_perf(u32 index); +static void aput_support_boost(u32 index); + +static struct aput_struct aput_cases[] = { + {"x86_vendor", aput_x86_vendor }, + {"acpi_cpc_valid", aput_acpi_cpc }, + {"modprobed_driver", aput_modprobed_driver }, + {"capability_check", aput_capability_check }, + {"enable", aput_enable }, + {"init_perf", aput_init_perf }, + {"support_boost", aput_support_boost } +}; + +static bool get_shared_mem(void) +{ + bool result = false; + char buf[5] = {0}; + struct file *filp = NULL; + loff_t pos = 0; + ssize_t ret; + + filp = filp_open("/sys/module/amd_pstate/parameters/shared_mem", FMODE_PREAD, 0); + if (IS_ERR(filp)) + { + pr_err("%s Open param file fail! \n", __func__); + } + else + { + ret = kernel_read(filp, &buf, sizeof(buf), &pos); + if (ret < 0) + { + pr_err("%s ret=%ld unable to read from param file! \n", __func__, ret); + } + filp_close(filp, NULL); + } + + if ('Y' == *buf) + { + result = true; + } + + return (result); +} + +static void aput_x86_vendor(u32 index) +{ + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_cases[index].result = APUT_RESULT_FAIL; + } +} + +static void aput_acpi_cpc(u32 index) +{ + if (acpi_cpc_valid()) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_cases[index].result = APUT_RESULT_FAIL; + } +} + +static void aput_modprobed_driver(u32 index) +{ + if (cpufreq_get_current_driver()) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_cases[index].result = APUT_RESULT_FAIL; + } +} + +static void aput_capability_check(u32 index) +{ + if (boot_cpu_has(X86_FEATURE_CPPC)) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + //shared memory + if (get_shared_mem()) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_cases[index].result = APUT_RESULT_FAIL; + } + } +} + +static void aput_pstate_enable(u32 index) +{ + int ret = 0; + u64 cppc_enable = 0; + + ret = rdmsrl_safe(MSR_AMD_CPPC_ENABLE, &cppc_enable); + if (ret) + { + aput_cases[index].result = APUT_RESULT_FAIL; + pr_err("%s rdmsrl_safe MSR_AMD_CPPC_ENABLE ret=%d is error! \n", __func__, ret); + return; + } + if (cppc_enable) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_cases[index].result = APUT_RESULT_FAIL; + } +} + +static void aput_enable(u32 index) +{ + if (get_shared_mem()) + { + //not check + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_pstate_enable(index); + } +} + +static void aput_init_perf(u32 index) +{ + int cpu = 0, ret = 0; + u32 highest_perf = 0, nominal_perf = 0, lowest_nonlinear_perf = 0, lowest_perf = 0; + u64 cap1 = 0; + struct cppc_perf_caps cppc_perf; + struct cpufreq_policy *policy = NULL; + struct amd_cpudata *cpudata = NULL; + + //get perf + highest_perf = amd_get_highest_perf(); + + for_each_possible_cpu(cpu) + { + //get amd cpudata + policy = cpufreq_cpu_get(cpu); + if (!policy) + break; + cpudata = policy->driver_data; + + if (get_shared_mem()) + { + ret = cppc_get_perf_caps(cpu, &cppc_perf); + if (ret) + { + aput_cases[index].result = APUT_RESULT_FAIL; + pr_err("%s cppc_get_perf_caps ret=%d is error! \n", __func__, ret); + return; + } + + nominal_perf = cppc_perf.nominal_perf; + lowest_nonlinear_perf = cppc_perf.lowest_nonlinear_perf; + lowest_perf = cppc_perf.lowest_perf; + } + else + { + ret = rdmsrl_safe_on_cpu(cpu, MSR_AMD_CPPC_CAP1, &cap1); + if (ret) + { + aput_cases[index].result = APUT_RESULT_FAIL; + pr_err("%s rdmsrl_safe_on_cpu MSR_AMD_CPPC_CAP1 ret=%d is error! \n", __func__, ret); + return; + } + + //get perf from MSR + nominal_perf = AMD_CPPC_NOMINAL_PERF(cap1); + lowest_nonlinear_perf = AMD_CPPC_LOWNONLIN_PERF(cap1); + lowest_perf = AMD_CPPC_LOWEST_PERF(cap1); + } + + //check highest_perf,nominal_perf,lowest_nonlinear_perf + if ((highest_perf != READ_ONCE(cpudata->highest_perf)) || + (nominal_perf != READ_ONCE(cpudata->nominal_perf)) || + (lowest_nonlinear_perf != READ_ONCE(cpudata->lowest_nonlinear_perf)) || + (lowest_perf != READ_ONCE(cpudata->lowest_perf))) + { + aput_cases[index].result = APUT_RESULT_FAIL; + pr_err("%s cpu%d highest_perf=%d %d nominal_perf=%d %d lowest_nonlinear_perf=%d %d lowest_perf=%d %d are not equal! \n", + __func__, cpu, highest_perf, cpudata->highest_perf, + nominal_perf, cpudata->nominal_perf, + lowest_nonlinear_perf, cpudata->lowest_nonlinear_perf, + lowest_perf, cpudata->lowest_perf); + return; + } + } + + aput_cases[index].result = APUT_RESULT_PASS; +} + +static void aput_support_boost(u32 index) +{ + int cpu = 0; + struct cpufreq_policy *policy = NULL; + struct amd_cpudata *cpudata = NULL; + + for_each_possible_cpu(cpu) + { + //get amd cpudata + policy = cpufreq_cpu_get(cpu); + if (!policy) + break; + cpudata = policy->driver_data; + + if (READ_ONCE(cpudata->boost_supported)) + { + aput_cases[index].result = APUT_RESULT_PASS; + } + else + { + aput_cases[index].result = APUT_RESULT_FAIL; + break; + } + } +} + +static void aput_do_test_case(void) +{ + u32 i=0, arr_size = ARRAY_SIZE(aput_cases); + + for (i = 0; i < arr_size; i++) + { + pr_info("****** Begin %-5d\t %-20s\t ******\n", i+1, aput_cases[i].name); + aput_cases[i].func(i); + KSTM_CHECK_ZERO(aput_cases[i].result); + pr_info("****** End %-5d\t %-20s\t ******\n", i+1, aput_cases[i].name); + } +} + +static void __init selftest(void) +{ + aput_do_test_case(); +} + +KSTM_MODULE_LOADERS(amd_pstate_testmod); +MODULE_AUTHOR("Meng Li <li.meng@amd.com>"); +MODULE_DESCRIPTION("Unit test for AMD P-state driver"); +MODULE_LICENSE("GPL"); -- 2.25.1
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