[PATCH v4 1/5] drm/amdgpu: track faulted gfx user-queue slots

A gfx priv/bad-op fault IV carries only the HW slot (ring_id), not the
faulting user queue's doorbell. Add userq_priv_fault_slots (an atomic
bitmap of faulted slots, so concurrent faults are not dropped) and
userq_priv_fault_work to struct amdgpu_gfx; a worker drains the bitmap
and reads the doorbell back from each HQD to locate and reset the queue.

Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Jesse Zhang <[email protected]>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
index c15f45a7347c..1023719c18bb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
@@ -535,6 +535,9 @@ struct amdgpu_gfx {
 	struct mutex                    userq_sch_mutex;
 	u64				userq_sch_req_count[MAX_XCP];
 	bool				userq_sch_inactive[MAX_XCP];
+	/* atomic bitmap of faulted gfx UQ slots (index = pipe | queue << 2) */
+	unsigned long			userq_priv_fault_slots;
+	struct work_struct		userq_priv_fault_work;
 	unsigned long			enforce_isolation_jiffies[MAX_XCP];
 	unsigned long			enforce_isolation_time[MAX_XCP];
 
-- 
2.49.0