40  * Most engines on the GPU are fed via ring buffers.  Ring
46  * pointers are equal, the ring is idle.  When the host
47  * writes commands to the ring buffer, it increments the
55  * @type: ring type for which to return the limit.
73  * amdgpu_ring_alloc - allocate space on the ring buffer
75  * @ring: amdgpu_ring structure holding ring information
76  * @ndw: number of dwords to allocate in the ring buffer
78  * Allocate @ndw dwords in the ring buffer (all asics).
81 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned int ndw)  in amdgpu_ring_alloc()  argument
85 	ndw = (ndw + ring->funcs->align_mask) & ~ring->funcs->align_mask;  in amdgpu_ring_alloc()
90 	if (WARN_ON_ONCE(ndw > ring->max_dw))  in amdgpu_ring_alloc()
93 	ring->count_dw = ndw;  in amdgpu_ring_alloc()
94 	ring->wptr_old = ring->wptr;  in amdgpu_ring_alloc()
96 	if (ring->funcs->begin_use)  in amdgpu_ring_alloc()
97 		ring->funcs->begin_use(ring);  in amdgpu_ring_alloc()
104  * @ring: amdgpu_ring structure holding ring information
109 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)  in amdgpu_ring_insert_nop()  argument
113 	occupied = ring->wptr & ring->buf_mask;  in amdgpu_ring_insert_nop()
114 	chunk1 = ring->buf_mask + 1 - occupied;  in amdgpu_ring_insert_nop()
119 		memset32(&ring->ring[occupied], ring->funcs->nop, chunk1);  in amdgpu_ring_insert_nop()
122 		memset32(ring->ring, ring->funcs->nop, chunk2);  in amdgpu_ring_insert_nop()
124 	ring->wptr += count;  in amdgpu_ring_insert_nop()
125 	ring->wptr &= ring->ptr_mask;  in amdgpu_ring_insert_nop()
126 	ring->count_dw -= count;  in amdgpu_ring_insert_nop()
132  * @ring: amdgpu_ring structure holding ring information
137 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)  in amdgpu_ring_generic_pad_ib()  argument
139 	while (ib->length_dw & ring->funcs->align_mask)  in amdgpu_ring_generic_pad_ib()
140 		ib->ptr[ib->length_dw++] = ring->funcs->nop;  in amdgpu_ring_generic_pad_ib()
145  * commands on the ring buffer
147  * @ring: amdgpu_ring structure holding ring information
150  * execute new commands on the ring buffer (all asics).
152 void amdgpu_ring_commit(struct amdgpu_ring *ring)  in amdgpu_ring_commit()  argument
156 	if (ring->count_dw < 0)  in amdgpu_ring_commit()
157 		DRM_ERROR("amdgpu: writing more dwords to the ring than expected!\n");  in amdgpu_ring_commit()
160 	count = ring->funcs->align_mask + 1 -  in amdgpu_ring_commit()
161 		(ring->wptr & ring->funcs->align_mask);  in amdgpu_ring_commit()
162 	count &= ring->funcs->align_mask;  in amdgpu_ring_commit()
165 		ring->funcs->insert_nop(ring, count);  in amdgpu_ring_commit()
168 	amdgpu_ring_set_wptr(ring);  in amdgpu_ring_commit()
170 	if (ring->funcs->end_use)  in amdgpu_ring_commit()
171 		ring->funcs->end_use(ring);  in amdgpu_ring_commit()
177  * @ring: amdgpu_ring structure holding ring information
181 void amdgpu_ring_undo(struct amdgpu_ring *ring)  in amdgpu_ring_undo()  argument
183 	ring->wptr = ring->wptr_old;  in amdgpu_ring_undo()
185 	if (ring->funcs->end_use)  in amdgpu_ring_undo()
186 		ring->funcs->end_use(ring);  in amdgpu_ring_undo()
189 #define amdgpu_ring_get_gpu_addr(ring, offset)				\  argument
190 	(ring->is_mes_queue ?						\
191 	 (ring->mes_ctx->meta_data_gpu_addr + offset) :			\
192 	 (ring->adev->wb.gpu_addr + offset * 4))
194 #define amdgpu_ring_get_cpu_addr(ring, offset)				\  argument
195 	(ring->is_mes_queue ?						\
196 	 (void *)((uint8_t *)(ring->mes_ctx->meta_data_ptr) + offset) : \
197 	 (&ring->adev->wb.wb[offset]))
200  * amdgpu_ring_init - init driver ring struct.
203  * @ring: amdgpu_ring structure holding ring information
204  * @max_dw: maximum number of dw for ring alloc
205  * @irq_src: interrupt source to use for this ring
206  * @irq_type: interrupt type to use for this ring
207  * @hw_prio: ring priority (NORMAL/HIGH)
210  * Initialize the driver information for the selected ring (all asics).
213 int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,  in amdgpu_ring_init()  argument
228 	 * KIQ tasks get submitted directly to the ring.  in amdgpu_ring_init()
230 	if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)  in amdgpu_ring_init()
232 	if (ring->funcs->type == AMDGPU_RING_TYPE_MES)  in amdgpu_ring_init()
234 	else if (ring == &adev->sdma.instance[0].page)  in amdgpu_ring_init()
237 	if (ring->adev == NULL) {  in amdgpu_ring_init()
241 		ring->adev = adev;  in amdgpu_ring_init()
242 		ring->num_hw_submission = sched_hw_submission;  in amdgpu_ring_init()
243 		ring->sched_score = sched_score;  in amdgpu_ring_init()
244 		ring->vmid_wait = dma_fence_get_stub();  in amdgpu_ring_init()
246 		if (!ring->is_mes_queue) {  in amdgpu_ring_init()
247 			ring->idx = adev->num_rings++;  in amdgpu_ring_init()
248 			adev->rings[ring->idx] = ring;  in amdgpu_ring_init()
251 		r = amdgpu_fence_driver_init_ring(ring);  in amdgpu_ring_init()
256 	if (ring->is_mes_queue) {  in amdgpu_ring_init()
257 		ring->rptr_offs = amdgpu_mes_ctx_get_offs(ring,  in amdgpu_ring_init()
259 		ring->wptr_offs = amdgpu_mes_ctx_get_offs(ring,  in amdgpu_ring_init()
261 		ring->fence_offs = amdgpu_mes_ctx_get_offs(ring,  in amdgpu_ring_init()
263 		ring->trail_fence_offs = amdgpu_mes_ctx_get_offs(ring,  in amdgpu_ring_init()
265 		ring->cond_exe_offs = amdgpu_mes_ctx_get_offs(ring,  in amdgpu_ring_init()
268 		r = amdgpu_device_wb_get(adev, &ring->rptr_offs);  in amdgpu_ring_init()
270 			dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);  in amdgpu_ring_init()
274 		r = amdgpu_device_wb_get(adev, &ring->wptr_offs);  in amdgpu_ring_init()
276 			dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);  in amdgpu_ring_init()
280 		r = amdgpu_device_wb_get(adev, &ring->fence_offs);  in amdgpu_ring_init()
282 			dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);  in amdgpu_ring_init()
286 		r = amdgpu_device_wb_get(adev, &ring->trail_fence_offs);  in amdgpu_ring_init()
288 			dev_err(adev->dev, "(%d) ring trail_fence_offs wb alloc failed\n", r);  in amdgpu_ring_init()
292 		r = amdgpu_device_wb_get(adev, &ring->cond_exe_offs);  in amdgpu_ring_init()
294 			dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r);  in amdgpu_ring_init()
299 	ring->fence_gpu_addr =  in amdgpu_ring_init()
300 		amdgpu_ring_get_gpu_addr(ring, ring->fence_offs);  in amdgpu_ring_init()
301 	ring->fence_cpu_addr =  in amdgpu_ring_init()
302 		amdgpu_ring_get_cpu_addr(ring, ring->fence_offs);  in amdgpu_ring_init()
304 	ring->rptr_gpu_addr =  in amdgpu_ring_init()
305 		amdgpu_ring_get_gpu_addr(ring, ring->rptr_offs);  in amdgpu_ring_init()
306 	ring->rptr_cpu_addr =  in amdgpu_ring_init()
307 		amdgpu_ring_get_cpu_addr(ring, ring->rptr_offs);  in amdgpu_ring_init()
309 	ring->wptr_gpu_addr =  in amdgpu_ring_init()
310 		amdgpu_ring_get_gpu_addr(ring, ring->wptr_offs);  in amdgpu_ring_init()
311 	ring->wptr_cpu_addr =  in amdgpu_ring_init()
312 		amdgpu_ring_get_cpu_addr(ring, ring->wptr_offs);  in amdgpu_ring_init()
314 	ring->trail_fence_gpu_addr =  in amdgpu_ring_init()
315 		amdgpu_ring_get_gpu_addr(ring, ring->trail_fence_offs);  in amdgpu_ring_init()
316 	ring->trail_fence_cpu_addr =  in amdgpu_ring_init()
317 		amdgpu_ring_get_cpu_addr(ring, ring->trail_fence_offs);  in amdgpu_ring_init()
319 	ring->cond_exe_gpu_addr =  in amdgpu_ring_init()
320 		amdgpu_ring_get_gpu_addr(ring, ring->cond_exe_offs);  in amdgpu_ring_init()
321 	ring->cond_exe_cpu_addr =  in amdgpu_ring_init()
322 		amdgpu_ring_get_cpu_addr(ring, ring->cond_exe_offs);  in amdgpu_ring_init()
325 	*ring->cond_exe_cpu_addr = 1;  in amdgpu_ring_init()
327 	r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);  in amdgpu_ring_init()
333 	max_ibs_dw = ring->funcs->emit_frame_size +  in amdgpu_ring_init()
334 		     amdgpu_ring_max_ibs(ring->funcs->type) * ring->funcs->emit_ib_size;  in amdgpu_ring_init()
335 	max_ibs_dw = (max_ibs_dw + ring->funcs->align_mask) & ~ring->funcs->align_mask;  in amdgpu_ring_init()
340 	ring->ring_size = roundup_pow_of_two(max_dw * 4 * sched_hw_submission);  in amdgpu_ring_init()
342 	ring->buf_mask = (ring->ring_size / 4) - 1;  in amdgpu_ring_init()
343 	ring->ptr_mask = ring->funcs->support_64bit_ptrs ?  in amdgpu_ring_init()
344 		0xffffffffffffffff : ring->buf_mask;  in amdgpu_ring_init()
346 	/* Allocate ring buffer */  in amdgpu_ring_init()
347 	if (ring->is_mes_queue) {  in amdgpu_ring_init()
350 		BUG_ON(ring->ring_size > PAGE_SIZE*4);  in amdgpu_ring_init()
352 		offset = amdgpu_mes_ctx_get_offs(ring,  in amdgpu_ring_init()
354 		ring->gpu_addr = amdgpu_mes_ctx_get_offs_gpu_addr(ring, offset);  in amdgpu_ring_init()
355 		ring->ring = amdgpu_mes_ctx_get_offs_cpu_addr(ring, offset);  in amdgpu_ring_init()
356 		amdgpu_ring_clear_ring(ring);  in amdgpu_ring_init()
358 	} else if (ring->ring_obj == NULL) {  in amdgpu_ring_init()
359 		r = amdgpu_bo_create_kernel(adev, ring->ring_size + ring->funcs->extra_dw, PAGE_SIZE,  in amdgpu_ring_init()
361 					    &ring->ring_obj,  in amdgpu_ring_init()
362 					    &ring->gpu_addr,  in amdgpu_ring_init()
363 					    (void **)&ring->ring);  in amdgpu_ring_init()
365 			dev_err(adev->dev, "(%d) ring create failed\n", r);  in amdgpu_ring_init()
368 		amdgpu_ring_clear_ring(ring);  in amdgpu_ring_init()
371 	ring->max_dw = max_dw;  in amdgpu_ring_init()
372 	ring->hw_prio = hw_prio;  in amdgpu_ring_init()
374 	if (!ring->no_scheduler && ring->funcs->type < AMDGPU_HW_IP_NUM) {  in amdgpu_ring_init()
375 		hw_ip = ring->funcs->type;  in amdgpu_ring_init()
378 			&ring->sched;  in amdgpu_ring_init()
385  * amdgpu_ring_fini - tear down the driver ring struct.
387  * @ring: amdgpu_ring structure holding ring information
389  * Tear down the driver information for the selected ring (all asics).
391 void amdgpu_ring_fini(struct amdgpu_ring *ring)  in amdgpu_ring_fini()  argument
394 	/* Not to finish a ring which is not initialized */  in amdgpu_ring_fini()
395 	if (!(ring->adev) ||  in amdgpu_ring_fini()
396 	    (!ring->is_mes_queue && !(ring->adev->rings[ring->idx])))  in amdgpu_ring_fini()
399 	ring->sched.ready = false;  in amdgpu_ring_fini()
401 	if (!ring->is_mes_queue) {  in amdgpu_ring_fini()
402 		amdgpu_device_wb_free(ring->adev, ring->rptr_offs);  in amdgpu_ring_fini()
403 		amdgpu_device_wb_free(ring->adev, ring->wptr_offs);  in amdgpu_ring_fini()
405 		amdgpu_device_wb_free(ring->adev, ring->cond_exe_offs);  in amdgpu_ring_fini()
406 		amdgpu_device_wb_free(ring->adev, ring->fence_offs);  in amdgpu_ring_fini()
408 		amdgpu_bo_free_kernel(&ring->ring_obj,  in amdgpu_ring_fini()
409 				      &ring->gpu_addr,  in amdgpu_ring_fini()
410 				      (void **)&ring->ring);  in amdgpu_ring_fini()
412 		kfree(ring->fence_drv.fences);  in amdgpu_ring_fini()
415 	dma_fence_put(ring->vmid_wait);  in amdgpu_ring_fini()
416 	ring->vmid_wait = NULL;  in amdgpu_ring_fini()
417 	ring->me = 0;  in amdgpu_ring_fini()
419 	if (!ring->is_mes_queue)  in amdgpu_ring_fini()
420 		ring->adev->rings[ring->idx] = NULL;  in amdgpu_ring_fini()
424  * amdgpu_ring_emit_reg_write_reg_wait_helper - ring helper
426  * @ring: ring to write to
435 void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,  in amdgpu_ring_emit_reg_write_reg_wait_helper()  argument
439 	amdgpu_ring_emit_wreg(ring, reg0, ref);  in amdgpu_ring_emit_reg_write_reg_wait_helper()
440 	amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);  in amdgpu_ring_emit_reg_write_reg_wait_helper()
444  * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
446  * @ring: ring to try the recovery on
450  * Tries to get a ring proceeding again when it is stuck.
452 bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,  in amdgpu_ring_soft_recovery()  argument
458 	if (unlikely(ring->adev->debug_disable_soft_recovery))  in amdgpu_ring_soft_recovery()
463 	if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)  in amdgpu_ring_soft_recovery()
471 	atomic_inc(&ring->adev->gpu_reset_counter);  in amdgpu_ring_soft_recovery()
474 		ring->funcs->soft_recovery(ring, vmid);  in amdgpu_ring_soft_recovery()
489  * followed by n-words of ring data
494 	struct amdgpu_ring *ring = file_inode(f)->i_private;  in amdgpu_debugfs_ring_read()  local
505 		early[0] = amdgpu_ring_get_rptr(ring) & ring->buf_mask;  in amdgpu_debugfs_ring_read()
506 		early[1] = amdgpu_ring_get_wptr(ring) & ring->buf_mask;  in amdgpu_debugfs_ring_read()
507 		early[2] = ring->wptr & ring->buf_mask;  in amdgpu_debugfs_ring_read()
520 		if (*pos >= (ring->ring_size + 12))  in amdgpu_debugfs_ring_read()
523 		value = ring->ring[(*pos - 12)/4];  in amdgpu_debugfs_ring_read()
545 	struct amdgpu_ring *ring = file_inode(f)->i_private;  in amdgpu_debugfs_mqd_read()  local
554 	kbuf = kmalloc(ring->mqd_size, GFP_KERNEL);  in amdgpu_debugfs_mqd_read()
558 	r = amdgpu_bo_reserve(ring->mqd_obj, false);  in amdgpu_debugfs_mqd_read()
562 	r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&mqd);  in amdgpu_debugfs_mqd_read()
570 	for (i = 0; i < ring->mqd_size/sizeof(u32); i++)  in amdgpu_debugfs_mqd_read()
573 	amdgpu_bo_kunmap(ring->mqd_obj);  in amdgpu_debugfs_mqd_read()
574 	amdgpu_bo_unreserve(ring->mqd_obj);  in amdgpu_debugfs_mqd_read()
578 		if (*pos >= ring->mqd_size)  in amdgpu_debugfs_mqd_read()
595 	amdgpu_bo_unreserve(ring->mqd_obj);  in amdgpu_debugfs_mqd_read()
609 	struct amdgpu_ring *ring = data;  in amdgpu_debugfs_ring_error()  local
611 	amdgpu_fence_driver_set_error(ring, val);  in amdgpu_debugfs_ring_error()
621 			      struct amdgpu_ring *ring)  in amdgpu_debugfs_ring_init()  argument
628 	sprintf(name, "amdgpu_ring_%s", ring->name);  in amdgpu_debugfs_ring_init()
629 	debugfs_create_file_size(name, S_IFREG | 0444, root, ring,  in amdgpu_debugfs_ring_init()
631 				 ring->ring_size + 12);  in amdgpu_debugfs_ring_init()
633 	if (ring->mqd_obj) {  in amdgpu_debugfs_ring_init()
634 		sprintf(name, "amdgpu_mqd_%s", ring->name);  in amdgpu_debugfs_ring_init()
635 		debugfs_create_file_size(name, S_IFREG | 0444, root, ring,  in amdgpu_debugfs_ring_init()
637 					 ring->mqd_size);  in amdgpu_debugfs_ring_init()
640 	sprintf(name, "amdgpu_error_%s", ring->name);  in amdgpu_debugfs_ring_init()
641 	debugfs_create_file(name, 0200, root, ring,  in amdgpu_debugfs_ring_init()
648  * amdgpu_ring_test_helper - tests ring and set sched readiness status
650  * @ring: ring to try the recovery on
652  * Tests ring and set sched readiness status
656 int amdgpu_ring_test_helper(struct amdgpu_ring *ring)  in amdgpu_ring_test_helper()  argument
658 	struct amdgpu_device *adev = ring->adev;  in amdgpu_ring_test_helper()
661 	r = amdgpu_ring_test_ring(ring);  in amdgpu_ring_test_helper()
663 		DRM_DEV_ERROR(adev->dev, "ring %s test failed (%d)\n",  in amdgpu_ring_test_helper()
664 			      ring->name, r);  in amdgpu_ring_test_helper()
666 		DRM_DEV_DEBUG(adev->dev, "ring test on %s succeeded\n",  in amdgpu_ring_test_helper()
667 			      ring->name);  in amdgpu_ring_test_helper()
669 	ring->sched.ready = !r;  in amdgpu_ring_test_helper()
674 static void amdgpu_ring_to_mqd_prop(struct amdgpu_ring *ring,  in amdgpu_ring_to_mqd_prop()  argument
677 	struct amdgpu_device *adev = ring->adev;  in amdgpu_ring_to_mqd_prop()
678 	bool is_high_prio_compute = ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE &&  in amdgpu_ring_to_mqd_prop()
679 				    amdgpu_gfx_is_high_priority_compute_queue(adev, ring);  in amdgpu_ring_to_mqd_prop()
680 	bool is_high_prio_gfx = ring->funcs->type == AMDGPU_RING_TYPE_GFX &&  in amdgpu_ring_to_mqd_prop()
681 				amdgpu_gfx_is_high_priority_graphics_queue(adev, ring);  in amdgpu_ring_to_mqd_prop()
685 	prop->mqd_gpu_addr = ring->mqd_gpu_addr;  in amdgpu_ring_to_mqd_prop()
686 	prop->hqd_base_gpu_addr = ring->gpu_addr;  in amdgpu_ring_to_mqd_prop()
687 	prop->rptr_gpu_addr = ring->rptr_gpu_addr;  in amdgpu_ring_to_mqd_prop()
688 	prop->wptr_gpu_addr = ring->wptr_gpu_addr;  in amdgpu_ring_to_mqd_prop()
689 	prop->queue_size = ring->ring_size;  in amdgpu_ring_to_mqd_prop()
690 	prop->eop_gpu_addr = ring->eop_gpu_addr;  in amdgpu_ring_to_mqd_prop()
691 	prop->use_doorbell = ring->use_doorbell;  in amdgpu_ring_to_mqd_prop()
692 	prop->doorbell_index = ring->doorbell_index;  in amdgpu_ring_to_mqd_prop()
697 	prop->hqd_active = ring->funcs->type == AMDGPU_RING_TYPE_KIQ;  in amdgpu_ring_to_mqd_prop()
706 int amdgpu_ring_init_mqd(struct amdgpu_ring *ring)  in amdgpu_ring_init_mqd()  argument
708 	struct amdgpu_device *adev = ring->adev;  in amdgpu_ring_init_mqd()
712 	amdgpu_ring_to_mqd_prop(ring, &prop);  in amdgpu_ring_init_mqd()
714 	ring->wptr = 0;  in amdgpu_ring_init_mqd()
716 	if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)  in amdgpu_ring_init_mqd()
719 		mqd_mgr = &adev->mqds[ring->funcs->type];  in amdgpu_ring_init_mqd()
721 	return mqd_mgr->init_mqd(adev, ring->mqd_ptr, &prop);  in amdgpu_ring_init_mqd()
724 void amdgpu_ring_ib_begin(struct amdgpu_ring *ring)  in amdgpu_ring_ib_begin()  argument
726 	if (ring->is_sw_ring)  in amdgpu_ring_ib_begin()
727 		amdgpu_sw_ring_ib_begin(ring);  in amdgpu_ring_ib_begin()
730 void amdgpu_ring_ib_end(struct amdgpu_ring *ring)  in amdgpu_ring_ib_end()  argument
732 	if (ring->is_sw_ring)  in amdgpu_ring_ib_end()
733 		amdgpu_sw_ring_ib_end(ring);  in amdgpu_ring_ib_end()
736 void amdgpu_ring_ib_on_emit_cntl(struct amdgpu_ring *ring)  in amdgpu_ring_ib_on_emit_cntl()  argument
738 	if (ring->is_sw_ring)  in amdgpu_ring_ib_on_emit_cntl()
739 		amdgpu_sw_ring_ib_mark_offset(ring, AMDGPU_MUX_OFFSET_TYPE_CONTROL);  in amdgpu_ring_ib_on_emit_cntl()
742 void amdgpu_ring_ib_on_emit_ce(struct amdgpu_ring *ring)  in amdgpu_ring_ib_on_emit_ce()  argument
744 	if (ring->is_sw_ring)  in amdgpu_ring_ib_on_emit_ce()
745 		amdgpu_sw_ring_ib_mark_offset(ring, AMDGPU_MUX_OFFSET_TYPE_CE);  in amdgpu_ring_ib_on_emit_ce()
748 void amdgpu_ring_ib_on_emit_de(struct amdgpu_ring *ring)  in amdgpu_ring_ib_on_emit_de()  argument
750 	if (ring->is_sw_ring)  in amdgpu_ring_ib_on_emit_de()
751 		amdgpu_sw_ring_ib_mark_offset(ring, AMDGPU_MUX_OFFSET_TYPE_DE);  in amdgpu_ring_ib_on_emit_de()
754 bool amdgpu_ring_sched_ready(struct amdgpu_ring *ring)  in amdgpu_ring_sched_ready()  argument
756 	if (!ring)  in amdgpu_ring_sched_ready()
759 	if (ring->no_scheduler || !drm_sched_wqueue_ready(&ring->sched))  in amdgpu_ring_sched_ready()