[PATCH v3 2/2] drm/amdgpu: Create an option to disable soft recovery

[André Almeida]

Create a module option to disable soft recoveries on amdgpu, making
every recovery go through the device reset path. This option makes
easier to force device resets for testing and debugging purposes.

Signed-off-by: André Almeida <andrealmeid at igalia.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h      | 1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 7 +++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 6 +++++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 82eaccfce347..5f49e2c0ae7a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1105,6 +1105,7 @@ struct amdgpu_device {
 	/* Debug */
 	bool                            debug_vm;
 	bool                            debug_largebar;
+	bool                            debug_disable_soft_recovery;
 };
 
 static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 33fddf7b1c4f..861830e1afa8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -124,6 +124,7 @@
 enum AMDGPU_DEBUG_MASK {
 	AMDGPU_DEBUG_VM = BIT(0),
 	AMDGPU_DEBUG_LARGEBAR = BIT(1),
+	AMDGPU_DEBUG_DISABLE_GPU_SOFT_RECOVERY = BIT(2),
 };
 
 unsigned int amdgpu_vram_limit = UINT_MAX;
@@ -935,6 +936,7 @@ MODULE_PARM_DESC(enforce_isolation, "enforce process isolation between graphics
  * - 0x2: Enable simulating large-bar capability on non-large bar system. This
  *   limits the VRAM size reported to ROCm applications to the visible
  *   size, usually 256MB.
+ * - 0x4: Disable GPU soft recovery, always do a full reset
  */
 MODULE_PARM_DESC(debug_mask, "debug options for amdgpu, disabled by default");
 module_param_named(debug_mask, amdgpu_debug_mask, uint, 0444);
@@ -2054,6 +2056,11 @@ static void amdgpu_init_debug_options(struct amdgpu_device *adev)
 		pr_info("debug: enabled simulating large-bar capability on non-large bar system\n");
 		adev->debug_largebar = true;
 	}
+
+	if (amdgpu_debug_mask & AMDGPU_DEBUG_DISABLE_GPU_SOFT_RECOVERY) {
+		pr_info("debug: soft reset for GPU recovery disabled\n");
+		adev->debug_disable_soft_recovery = true;
+	}
 }
 
 static int amdgpu_pci_probe(struct pci_dev *pdev,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 80d6e132e409..6a80d3ec887e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -434,8 +434,12 @@ bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
 			       struct dma_fence *fence)
 {
 	unsigned long flags;
+	ktime_t deadline;
 
-	ktime_t deadline = ktime_add_us(ktime_get(), 10000);
+	if (unlikely(ring->adev->debug_disable_soft_recovery))
+		return false;
+
+	deadline = ktime_add_us(ktime_get(), 10000);
 
 	if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)
 		return false;
-- 
2.42.0