drm/xe: Remove last fence dependency check from binds and execs

Eliminate redundant last fence dependency checks in exec and bind jobs,
as they are now equivalent to xe_exec_queue_is_idle. Simplify the code
by removing this dead logic.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patch.msgid.link/20251031234050.3043507-7-matthew.brost@intel.com

Author: mbrost05

drivers/gpu/drm/xe/xe_exec.c

@@ -302,10 +302,6 @@ int xe_exec_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 		goto err_put_job;
 
 	if (!xe_vm_in_lr_mode(vm)) {
-		err = xe_sched_job_last_fence_add_dep(job, vm);
-		if (err)
-			goto err_put_job;
-
 		err = xe_svm_notifier_lock_interruptible(vm);
 		if (err)
 			goto err_put_job;

drivers/gpu/drm/xe/xe_exec_queue.c

@@ -1125,29 +1125,6 @@ void xe_exec_queue_last_fence_set(struct xe_exec_queue *q, struct xe_vm *vm,
 	q->last_fence = dma_fence_get(fence);
 }
 
-/**
- * xe_exec_queue_last_fence_test_dep - Test last fence dependency of queue
- * @q: The exec queue
- * @vm: The VM the engine does a bind or exec for
- *
- * Returns:
- * -ETIME if there exists an unsignalled last fence dependency, zero otherwise.
- */
-int xe_exec_queue_last_fence_test_dep(struct xe_exec_queue *q, struct xe_vm *vm)
-{
-	struct dma_fence *fence;
-	int err = 0;
-
-	fence = xe_exec_queue_last_fence_get(q, vm);
-	if (fence) {
-		err = test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags) ?
-			0 : -ETIME;
-		dma_fence_put(fence);
-	}
-
-	return err;
-}
-
 /**
  * xe_exec_queue_tlb_inval_last_fence_put() - Drop ref to last TLB invalidation fence
  * @q: The exec queue

drivers/gpu/drm/xe/xe_exec_queue.h

@@ -88,8 +88,6 @@ struct dma_fence *xe_exec_queue_last_fence_get_for_resume(struct xe_exec_queue *
 							  struct xe_vm *vm);
 void xe_exec_queue_last_fence_set(struct xe_exec_queue *e, struct xe_vm *vm,
 				  struct dma_fence *fence);
-int xe_exec_queue_last_fence_test_dep(struct xe_exec_queue *q,
-				      struct xe_vm *vm);
 
 void xe_exec_queue_tlb_inval_last_fence_put(struct xe_exec_queue *q,
 					    struct xe_vm *vm,

drivers/gpu/drm/xe/xe_pt.c

@@ -1338,13 +1338,6 @@ static int xe_pt_vm_dependencies(struct xe_sched_job *job,
 			return err;
 	}
 
-	if (!(pt_update_ops->q->flags & EXEC_QUEUE_FLAG_KERNEL)) {
-		if (job)
-			err = xe_sched_job_last_fence_add_dep(job, vm);
-		else
-			err = xe_exec_queue_last_fence_test_dep(pt_update_ops->q, vm);
-	}
-
 	for (i = 0; job && !err && i < vops->num_syncs; i++)
 		err = xe_sync_entry_add_deps(&vops->syncs[i], job);
 

drivers/gpu/drm/xe/xe_sched_job.c

@@ -297,23 +297,6 @@ void xe_sched_job_push(struct xe_sched_job *job)
 	xe_sched_job_put(job);
 }
 
-/**
- * xe_sched_job_last_fence_add_dep - Add last fence dependency to job
- * @job:job to add the last fence dependency to
- * @vm: virtual memory job belongs to
- *
- * Returns:
- * 0 on success, or an error on failing to expand the array.
- */
-int xe_sched_job_last_fence_add_dep(struct xe_sched_job *job, struct xe_vm *vm)
-{
-	struct dma_fence *fence;
-
-	fence = xe_exec_queue_last_fence_get(job->q, vm);
-
-	return drm_sched_job_add_dependency(&job->drm, fence);
-}
-
 /**
  * xe_sched_job_init_user_fence - Initialize user_fence for the job
  * @job: job whose user_fence needs an init

drivers/gpu/drm/xe/xe_sched_job.h

@@ -58,7 +58,6 @@ bool xe_sched_job_completed(struct xe_sched_job *job);
 void xe_sched_job_arm(struct xe_sched_job *job);
 void xe_sched_job_push(struct xe_sched_job *job);
 
-int xe_sched_job_last_fence_add_dep(struct xe_sched_job *job, struct xe_vm *vm);
 void xe_sched_job_init_user_fence(struct xe_sched_job *job,
 				  struct xe_sync_entry *sync);