[PATCH 2/2] cpufreq/amd-pstate-ut: Add test case for mode switches

Mario Limonciello
2024-09-01T02:49:35Z

There is a state machine in the amd-pstate driver utilized for
switches for all modes. To make sure that cleanup and setup works
properly for each mode add a unit test case that tries all
combinations.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
drivers/cpufreq/amd-pstate-ut.c | 41 ++++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c
index b7318669485e4..c291b3dbec381 100644
--- a/drivers/cpufreq/amd-pstate-ut.c
+++ b/drivers/cpufreq/amd-pstate-ut.c
@@ -54,12 +54,14 @@ static void amd_pstate_ut_acpi_cpc_valid(u32 index);
static void amd_pstate_ut_check_enabled(u32 index);
static void amd_pstate_ut_check_perf(u32 index);
static void amd_pstate_ut_check_freq(u32 index);
+static void amd_pstate_ut_check_driver(u32 index);

static struct amd_pstate_ut_struct amd_pstate_ut_cases[] = {
{"amd_pstate_ut_acpi_cpc_valid", amd_pstate_ut_acpi_cpc_valid },
{"amd_pstate_ut_check_enabled", amd_pstate_ut_check_enabled },
{"amd_pstate_ut_check_perf", amd_pstate_ut_check_perf },
- {"amd_pstate_ut_check_freq", amd_pstate_ut_check_freq }
+ {"amd_pstate_ut_check_freq", amd_pstate_ut_check_freq },
+ {"amd_pstate_ut_check_driver", amd_pstate_ut_check_driver }
};

static bool get_shared_mem(void)
@@ -257,6 +259,43 @@ static void amd_pstate_ut_check_freq(u32 index)
cpufreq_cpu_put(policy);
}

+static int amd_pstate_set_mode(enum amd_pstate_mode mode)
+{
+ const char *mode_str = amd_pstate_get_mode_string(mode);
+
+ pr_debug("->setting mode to %s\n", mode_str);
+
+ return amd_pstate_update_status(mode_str, strlen(mode_str));
+}
+
+static void amd_pstate_ut_check_driver(u32 index)
+{
+ enum amd_pstate_mode mode1, mode2;
+ int ret;
+
+ for (mode1 = AMD_PSTATE_DISABLE; mode1 < AMD_PSTATE_MAX; mode1++) {
+ ret = amd_pstate_set_mode(mode1);
+ if (ret)
+ goto out;
+ for (mode2 = AMD_PSTATE_DISABLE; mode2 < AMD_PSTATE_MAX; mode2++) {
+ if (mode1 == mode2)
+ continue;
+ ret = amd_pstate_set_mode(mode2);
+ if (ret)
+ goto out;
+ }
+ }
+out:
+ if (ret)
+ pr_warn("%s: failed to update status for %s->%s: %d\n", __func__,
+ amd_pstate_get_mode_string(mode1),
+ amd_pstate_get_mode_string(mode2), ret);
+
+ amd_pstate_ut_cases[index].result = ret ?
+ AMD_PSTATE_UT_RESULT_FAIL :
+ AMD_PSTATE_UT_RESULT_PASS;
+}
+
static int __init amd_pstate_ut_init(void)
{
u32 i = 0, arr_size = ARRAY_SIZE(amd_pstate_ut_cases);
--
2.43.0