[PATCH v2] drm/amdgpu: change reset lock from mutex to rw_semaphore
Dennis Li
Dennis.Li at amd.com
Thu Aug 20 09:32:38 UTC 2020
clients don't need reset-lock for synchronization when no
GPU recovery.
v2:
change to return the return value of down_read_killable.
Signed-off-by: Dennis Li <Dennis.Li at amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index c8aec832b244..ec11ed2a9ca4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -954,7 +954,7 @@ struct amdgpu_device {
atomic_t in_gpu_reset;
enum pp_mp1_state mp1_state;
- struct mutex lock_reset;
+ struct rw_semaphore reset_sem;
struct amdgpu_doorbell_index doorbell_index;
struct mutex notifier_lock;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 79b397800cbc..cc5c7f81c540 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -101,14 +101,18 @@ static int amdgpu_debugfs_autodump_open(struct inode *inode, struct file *file)
file->private_data = adev;
- mutex_lock(&adev->lock_reset);
+ ret = down_read_killable(&adev->reset_sem);
+ if (ret)
+ return ret;
+
if (adev->autodump.dumping.done) {
reinit_completion(&adev->autodump.dumping);
ret = 0;
} else {
ret = -EBUSY;
}
- mutex_unlock(&adev->lock_reset);
+
+ up_read(&adev->reset_sem);
return ret;
}
@@ -1242,7 +1246,9 @@ static int amdgpu_debugfs_test_ib(struct seq_file *m, void *data)
}
/* Avoid accidently unparking the sched thread during GPU reset */
- mutex_lock(&adev->lock_reset);
+ r = down_read_killable(&adev->reset_sem);
+ if (r)
+ return r;
/* hold on the scheduler */
for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
@@ -1269,7 +1275,7 @@ static int amdgpu_debugfs_test_ib(struct seq_file *m, void *data)
kthread_unpark(ring->sched.thread);
}
- mutex_unlock(&adev->lock_reset);
+ up_read(&adev->reset_sem);
pm_runtime_mark_last_busy(dev->dev);
pm_runtime_put_autosuspend(dev->dev);
@@ -1459,7 +1465,9 @@ static int amdgpu_debugfs_ib_preempt(void *data, u64 val)
return -ENOMEM;
/* Avoid accidently unparking the sched thread during GPU reset */
- mutex_lock(&adev->lock_reset);
+ r = down_read_killable(&adev->reset_sem);
+ if (r)
+ goto pro_end;
/* stop the scheduler */
kthread_park(ring->sched.thread);
@@ -1500,13 +1508,14 @@ static int amdgpu_debugfs_ib_preempt(void *data, u64 val)
/* restart the scheduler */
kthread_unpark(ring->sched.thread);
- mutex_unlock(&adev->lock_reset);
+ up_read(&adev->reset_sem);
ttm_bo_unlock_delayed_workqueue(&adev->mman.bdev, resched);
+pro_end:
kfree(fences);
- return 0;
+ return r;
}
static int amdgpu_debugfs_sclk_set(void *data, u64 val)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 78fd2c9a7b7d..82242e2f5658 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3054,7 +3054,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
mutex_init(&adev->virt.vf_errors.lock);
hash_init(adev->mn_hash);
atomic_set(&adev->in_gpu_reset, 0);
- mutex_init(&adev->lock_reset);
+ init_rwsem(&adev->reset_sem);
mutex_init(&adev->psp.mutex);
mutex_init(&adev->notifier_lock);
@@ -4206,7 +4206,7 @@ static bool amdgpu_device_lock_adev(struct amdgpu_device *adev)
if (atomic_cmpxchg(&adev->in_gpu_reset, 0, 1) != 0)
return false;
- mutex_lock(&adev->lock_reset);
+ down_write(&adev->reset_sem);
atomic_inc(&adev->gpu_reset_counter);
switch (amdgpu_asic_reset_method(adev)) {
@@ -4229,7 +4229,7 @@ static void amdgpu_device_unlock_adev(struct amdgpu_device *adev)
amdgpu_vf_error_trans_all(adev);
adev->mp1_state = PP_MP1_STATE_NONE;
atomic_set(&adev->in_gpu_reset, 0);
- mutex_unlock(&adev->lock_reset);
+ up_write(&adev->reset_sem);
}
static void amdgpu_device_resume_display_audio(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
index f27d83f2de78..8ac63f13fc6f 100644
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_ai.c
@@ -238,19 +238,12 @@ static void xgpu_ai_mailbox_flr_work(struct work_struct *work)
struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, flr_work);
struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
int timeout = AI_MAILBOX_POLL_FLR_TIMEDOUT;
- int locked;
/* block amdgpu_gpu_recover till msg FLR COMPLETE received,
* otherwise the mailbox msg will be ruined/reseted by
* the VF FLR.
- *
- * we can unlock the lock_reset to allow "amdgpu_job_timedout"
- * to run gpu_recover() after FLR_NOTIFICATION_CMPL received
- * which means host side had finished this VF's FLR.
*/
- locked = mutex_trylock(&adev->lock_reset);
- if (locked)
- atomic_set(&adev->in_gpu_reset, 1);
+ down_read(&adev->reset_sem);
do {
if (xgpu_ai_mailbox_peek_msg(adev) == IDH_FLR_NOTIFICATION_CMPL)
@@ -261,10 +254,7 @@ static void xgpu_ai_mailbox_flr_work(struct work_struct *work)
} while (timeout > 1);
flr_done:
- if (locked) {
- atomic_set(&adev->in_gpu_reset, 0);
- mutex_unlock(&adev->lock_reset);
- }
+ up_read(&adev->reset_sem);
/* Trigger recovery for world switch failure if no TDR */
if (amdgpu_device_should_recover_gpu(adev)
diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
index 3cb10ab943a6..bcc583f087e7 100644
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
@@ -259,19 +259,12 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work)
struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, flr_work);
struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
int timeout = NV_MAILBOX_POLL_FLR_TIMEDOUT;
- int locked;
/* block amdgpu_gpu_recover till msg FLR COMPLETE received,
* otherwise the mailbox msg will be ruined/reseted by
* the VF FLR.
- *
- * we can unlock the lock_reset to allow "amdgpu_job_timedout"
- * to run gpu_recover() after FLR_NOTIFICATION_CMPL received
- * which means host side had finished this VF's FLR.
*/
- locked = mutex_trylock(&adev->lock_reset);
- if (locked)
- atomic_set(&adev->in_gpu_reset, 1);
+ down_read(&adev->reset_sem);
do {
if (xgpu_nv_mailbox_peek_msg(adev) == IDH_FLR_NOTIFICATION_CMPL)
@@ -282,10 +275,7 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work)
} while (timeout > 1);
flr_done:
- if (locked) {
- atomic_set(&adev->in_gpu_reset, 0);
- mutex_unlock(&adev->lock_reset);
- }
+ up_read(&adev->reset_sem);
/* Trigger recovery for world switch failure if no TDR */
if (amdgpu_device_should_recover_gpu(adev)
--
2.17.1
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