[PATCH v2 4/7] drm/amdgpu: Add delayed work for GPU reset from debugfs

[Andrey Grodzovsky]

We need to have a delayed work to cancel this reset if another
already in progress.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 19 +++++++++++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 3c20c2eadf4e..4ef17c6d1a50 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1048,6 +1048,8 @@ struct amdgpu_device {
 
 	bool                            scpm_enabled;
 	uint32_t                        scpm_status;
+
+	struct delayed_work		reset_work;
 };
 
 static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index d16c8c1f72db..f980f1501c48 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -39,6 +39,7 @@
 #include <drm/drm_drv.h>
 #include "amdgpu.h"
 #include "amdgpu_trace.h"
+#include "amdgpu_reset.h"
 
 /*
  * Fences
@@ -798,7 +799,10 @@ static int gpu_recover_get(void *data, u64 *val)
 		return 0;
 	}
 
-	*val = amdgpu_device_gpu_recover(adev, NULL);
+	if (amdgpu_reset_domain_schedule(adev->reset_domain, &adev->reset_work))
+		flush_delayed_work(&adev->reset_work);
+
+	*val = atomic_read(&adev->reset_domain->reset_res);
 
 	pm_runtime_mark_last_busy(dev->dev);
 	pm_runtime_put_autosuspend(dev->dev);
@@ -810,6 +814,14 @@ DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_fence_info);
 DEFINE_DEBUGFS_ATTRIBUTE(amdgpu_debugfs_gpu_recover_fops, gpu_recover_get, NULL,
 			 "%lld\n");
 
+static void amdgpu_debugfs_reset_work(struct work_struct *work)
+{
+	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
+						  reset_work.work);
+
+	amdgpu_device_gpu_recover_imp(adev, NULL);
+}
+
 #endif
 
 void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
@@ -821,9 +833,12 @@ void amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
 	debugfs_create_file("amdgpu_fence_info", 0444, root, adev,
 			    &amdgpu_debugfs_fence_info_fops);
 
-	if (!amdgpu_sriov_vf(adev))
+	if (!amdgpu_sriov_vf(adev)) {
+
+		INIT_DELAYED_WORK(&adev->reset_work, amdgpu_debugfs_reset_work);
 		debugfs_create_file("amdgpu_gpu_recover", 0444, root, adev,
 				    &amdgpu_debugfs_gpu_recover_fops);
+	}
 #endif
 }
 
-- 
2.25.1