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drm/amd/powerplay: add sensor lock support for smu 

when multithreading access sysfs of amdgpu_pm_info at the sametime.
the swsmu driver cause smu firmware hang.

eg:
single thread access:
Message A + Param A ==> right
Message B + Param B ==> right
Message C + Param C ==> right
multithreading access:
Message A + Param B ==> error
Message B + Param A ==> error
Message C + Param C ==> right

the patch will add sensor lock(mutex) to avoid this error.

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 5.3.x
This commit is contained in:
Kevin Wang 2019-09-26 16:22:13 +08:00 committed by Alex Deucher
parent e0e4a2ce7a
commit 0092130675
5 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
View File

@ -843,6 +843,8 @@ static int smu_sw_init(void *handle)
smu->smu_baco.state = SMU_BACO_STATE_EXIT;
smu->smu_baco.platform_support = false;
mutex_init(&smu->sensor_lock);
smu->watermarks_bitmap = 0;
smu->power_profile_mode = PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;
smu->default_power_profile_mode = PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;

2
drivers/gpu/drm/amd/powerplay/arcturus_ppt.c
View File

@ -1018,6 +1018,7 @@ static int arcturus_read_sensor(struct smu_context *smu,
if (!data || !size)
return -EINVAL;
mutex_lock(&smu->sensor_lock);
switch (sensor) {
case AMDGPU_PP_SENSOR_MAX_FAN_RPM:
*(uint32_t *)data = pptable->FanMaximumRpm;
@ -1044,6 +1045,7 @@ static int arcturus_read_sensor(struct smu_context *smu,
default:
ret = smu_smc_read_sensor(smu, sensor, data, size);
}
mutex_unlock(&smu->sensor_lock);
return ret;
}

1
drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
View File

@ -344,6 +344,7 @@ struct smu_context
const struct smu_funcs *funcs;
const struct pptable_funcs *ppt_funcs;
struct mutex mutex;
struct mutex sensor_lock;
uint64_t pool_size;
struct smu_table_context smu_table;

2
drivers/gpu/drm/amd/powerplay/navi10_ppt.c
View File

@ -1386,6 +1386,7 @@ static int navi10_read_sensor(struct smu_context *smu,
if(!data || !size)
return -EINVAL;
mutex_lock(&smu->sensor_lock);
switch (sensor) {
case AMDGPU_PP_SENSOR_MAX_FAN_RPM:
*(uint32_t *)data = pptable->FanMaximumRpm;
@ -1409,6 +1410,7 @@ static int navi10_read_sensor(struct smu_context *smu,
default:
ret = smu_smc_read_sensor(smu, sensor, data, size);
}
mutex_unlock(&smu->sensor_lock);
return ret;
}

2
drivers/gpu/drm/amd/powerplay/vega20_ppt.c
View File

@ -3023,6 +3023,7 @@ static int vega20_read_sensor(struct smu_context *smu,
if(!data || !size)
return -EINVAL;
mutex_lock(&smu->sensor_lock);
switch (sensor) {
case AMDGPU_PP_SENSOR_MAX_FAN_RPM:
*(uint32_t *)data = pptable->FanMaximumRpm;
@ -3048,6 +3049,7 @@ static int vega20_read_sensor(struct smu_context *smu,
default:
ret = smu_smc_read_sensor(smu, sensor, data, size);
}
mutex_unlock(&smu->sensor_lock);
return ret;
}