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amd-pstate-ut: Reset amd-pstate driver mode after running selftests

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In amd-pstate-ut, one of the basic test is to switch between all
possible mode combinations. After running this test the mode of the
amd-pstate driver is active mode. Store and reset the mode to its original
state.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20250430064206.7402-1-swapnil.sapkal@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
This commit is contained in:
Swapnil Sapkal 2025-04-30 06:42:06 +00:00 committed by Mario Limonciello
parent 608a76b652
commit d26d16438b
3 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/cpufreq/amd-pstate-ut.c
View File

@ -242,6 +242,8 @@ static int amd_pstate_set_mode(enum amd_pstate_mode mode)
static int amd_pstate_ut_check_driver(u32 index)
{
enum amd_pstate_mode mode1, mode2 = AMD_PSTATE_DISABLE;
enum amd_pstate_mode orig_mode = amd_pstate_get_status();
int ret;
for (mode1 = AMD_PSTATE_DISABLE; mode1 < AMD_PSTATE_MAX; mode1++) {
int ret = amd_pstate_set_mode(mode1);
@ -251,16 +253,19 @@ static int amd_pstate_ut_check_driver(u32 index)
if (mode1 == mode2)
continue;
ret = amd_pstate_set_mode(mode2);
if (ret) {
pr_err("%s: failed to update status for %s->%s\n", __func__,
amd_pstate_get_mode_string(mode1),
amd_pstate_get_mode_string(mode2));
return ret;
}
if (ret)
goto out;
}
}
return 0;
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_set_mode(orig_mode);
return ret;
}
static int __init amd_pstate_ut_init(void)

6
drivers/cpufreq/amd-pstate.c
View File

@ -1332,6 +1332,12 @@ static ssize_t amd_pstate_show_status(char *buf)
return sysfs_emit(buf, "%s\n", amd_pstate_mode_string[cppc_state]);
}
int amd_pstate_get_status(void)
{
return cppc_state;
}
EXPORT_SYMBOL_GPL(amd_pstate_get_status);
int amd_pstate_update_status(const char *buf, size_t size)
{
int mode_idx;

1
drivers/cpufreq/amd-pstate.h
View File

@ -121,6 +121,7 @@ enum amd_pstate_mode {
AMD_PSTATE_MAX,
};
const char *amd_pstate_get_mode_string(enum amd_pstate_mode mode);
int amd_pstate_get_status(void);
int amd_pstate_update_status(const char *buf, size_t size);
#endif /* _LINUX_AMD_PSTATE_H */