[RFC v2 4/8] drm/amdgpu: Serialize non TDR gpu recovery with TDRs

[Andrey Grodzovsky]

Use reset domain wq also for non TDR gpu recovery trigers
such as sysfs and RAS. We must serialize all possible
GPU recoveries to gurantee no concurrency there.
For TDR call the original recovery function directly since
it's already executed from within the wq. For others just
use a wrapper to qeueue work and wait on it to finish.

v2: Rename to amdgpu_recover_work_struct

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 33 +++++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_job.c    |  2 +-
 3 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index b5ff76aae7e0..8e96b9a14452 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1296,6 +1296,8 @@ bool amdgpu_device_has_job_running(struct amdgpu_device *adev);
 bool amdgpu_device_should_recover_gpu(struct amdgpu_device *adev);
 int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
 			      struct amdgpu_job* job);
+int amdgpu_device_gpu_recover_imp(struct amdgpu_device *adev,
+			      struct amdgpu_job *job);
 void amdgpu_device_pci_config_reset(struct amdgpu_device *adev);
 int amdgpu_device_pci_reset(struct amdgpu_device *adev);
 bool amdgpu_device_need_post(struct amdgpu_device *adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7c063fd37389..258ec3c0b2af 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4979,7 +4979,7 @@ static void amdgpu_device_recheck_guilty_jobs(
  * Returns 0 for success or an error on failure.
  */
 
-int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
+int amdgpu_device_gpu_recover_imp(struct amdgpu_device *adev,
 			      struct amdgpu_job *job)
 {
 	struct list_head device_list, *device_list_handle =  NULL;
@@ -5237,6 +5237,37 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
 	return r;
 }
 
+struct amdgpu_recover_work_struct {
+	struct work_struct base;
+	struct amdgpu_device *adev;
+	struct amdgpu_job *job;
+	int ret;
+};
+
+static void amdgpu_device_queue_gpu_recover_work(struct work_struct *work)
+{
+	struct amdgpu_recover_work_struct *recover_work = container_of(work, struct amdgpu_recover_work_struct, base);
+
+	recover_work->ret = amdgpu_device_gpu_recover_imp(recover_work->adev, recover_work->job);
+}
+/*
+ * Serialize gpu recover into reset domain single threaded wq
+ */
+int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
+				    struct amdgpu_job *job)
+{
+	struct amdgpu_recover_work_struct work = {.adev = adev, .job = job};
+
+	INIT_WORK(&work.base, amdgpu_device_queue_gpu_recover_work);
+
+	if (!queue_work(adev->reset_domain.wq, &work.base))
+		return -EAGAIN;
+
+	flush_work(&work.base);
+
+	return work.ret;
+}
+
 /**
  * amdgpu_device_get_pcie_info - fence pcie info about the PCIE slot
  *
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index bfc47bea23db..38c9fd7b7ad4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -63,7 +63,7 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
 		  ti.process_name, ti.tgid, ti.task_name, ti.pid);
 
 	if (amdgpu_device_should_recover_gpu(ring->adev)) {
-		amdgpu_device_gpu_recover(ring->adev, job);
+		amdgpu_device_gpu_recover_imp(ring->adev, job);
 	} else {
 		drm_sched_suspend_timeout(&ring->sched);
 		if (amdgpu_sriov_vf(adev))
-- 
2.25.1