The patch below does not apply to the 5.3-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 00921306751001b539ebee34171485cd9c749024 Mon Sep 17 00:00:00 2001

From: Kevin Wang kevin1.wang@amd.com Date: Thu, 26 Sep 2019 16:22:13 +0800 Subject: [PATCH] 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

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c index 33960fb38a5d..4acf139ea014 100644 --- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c +++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c @@ -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; diff --git a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c index f1f072012fac..d493a3f8c07a 100644 --- a/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/arcturus_ppt.c @@ -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; } diff --git a/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h index 6109815a0401..23171a4d9a31 100644 --- a/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h +++ b/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h @@ -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; diff --git a/drivers/gpu/drm/amd/powerplay/navi10_ppt.c b/drivers/gpu/drm/amd/powerplay/navi10_ppt.c index 2574f7186e16..0b461404af6b 100644 --- a/drivers/gpu/drm/amd/powerplay/navi10_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/navi10_ppt.c @@ -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; } diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c index 64386ee3f878..bbd8ebd58434 100644 --- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c @@ -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; }