drm/amdgpu: Introduce cached_rptr and is_guilty callback in amdgpu_ring

This patch introduces the following changes:
- Add `cached_rptr` to the `amdgpu_ring` structure to store the read pointer before a reset.
- Add `is_guilty` callback to the `amdgpu_ring_funcs` structure to check if a ring is guilty of causing a timeout.

Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jesse Zhang <jesse.zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 7372e4aed6b0..52f7a9a79e7b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -238,6 +238,7 @@ struct amdgpu_ring_funcs {
 	void (*patch_de)(struct amdgpu_ring *ring, unsigned offset);
 	int (*reset)(struct amdgpu_ring *ring, unsigned int vmid);
 	void (*emit_cleaner_shader)(struct amdgpu_ring *ring);
+	bool (*is_guilty)(struct amdgpu_ring *ring);
 };
 
 struct amdgpu_ring {
@@ -307,6 +308,8 @@ struct amdgpu_ring {
 
 	bool            is_sw_ring;
 	unsigned int    entry_index;
+	/* store the cached rptr to restore after reset */
+	uint64_t cached_rptr;
 
 };