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
53  * amdgpu_ring_alloc - allocate space on the ring buffer
56  * @ring: amdgpu_ring structure holding ring information
57  * @ndw: number of dwords to allocate in the ring buffer
59  * Allocate @ndw dwords in the ring buffer (all asics).
62 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw)  in amdgpu_ring_alloc()  argument
66 	ndw = (ndw + ring->funcs->align_mask) & ~ring->funcs->align_mask;  in amdgpu_ring_alloc()
71 	if (WARN_ON_ONCE(ndw > ring->max_dw))  in amdgpu_ring_alloc()
74 	ring->count_dw = ndw;  in amdgpu_ring_alloc()
75 	ring->wptr_old = ring->wptr;  in amdgpu_ring_alloc()
77 	if (ring->funcs->begin_use)  in amdgpu_ring_alloc()
78 		ring->funcs->begin_use(ring);  in amdgpu_ring_alloc()
85  * @ring: amdgpu_ring structure holding ring information
90 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)  in amdgpu_ring_insert_nop()  argument
95 		amdgpu_ring_write(ring, ring->funcs->nop);  in amdgpu_ring_insert_nop()
100  * @ring: amdgpu_ring structure holding ring information
105 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)  in amdgpu_ring_generic_pad_ib()  argument
107 	while (ib->length_dw & ring->funcs->align_mask)  in amdgpu_ring_generic_pad_ib()
108 		ib->ptr[ib->length_dw++] = ring->funcs->nop;  in amdgpu_ring_generic_pad_ib()
113  * commands on the ring buffer
116  * @ring: amdgpu_ring structure holding ring information
119  * execute new commands on the ring buffer (all asics).
121 void amdgpu_ring_commit(struct amdgpu_ring *ring)  in amdgpu_ring_commit()  argument
126 	count = ring->funcs->align_mask + 1 -  in amdgpu_ring_commit()
127 		(ring->wptr & ring->funcs->align_mask);  in amdgpu_ring_commit()
128 	count %= ring->funcs->align_mask + 1;  in amdgpu_ring_commit()
129 	ring->funcs->insert_nop(ring, count);  in amdgpu_ring_commit()
132 	amdgpu_ring_set_wptr(ring);  in amdgpu_ring_commit()
134 	if (ring->funcs->end_use)  in amdgpu_ring_commit()
135 		ring->funcs->end_use(ring);  in amdgpu_ring_commit()
141  * @ring: amdgpu_ring structure holding ring information
145 void amdgpu_ring_undo(struct amdgpu_ring *ring)  in amdgpu_ring_undo()  argument
147 	ring->wptr = ring->wptr_old;  in amdgpu_ring_undo()
149 	if (ring->funcs->end_use)  in amdgpu_ring_undo()
150 		ring->funcs->end_use(ring);  in amdgpu_ring_undo()
154  * amdgpu_ring_init - init driver ring struct.
157  * @ring: amdgpu_ring structure holding ring information
158  * @max_ndw: maximum number of dw for ring alloc
159  * @nop: nop packet for this ring
161  * Initialize the driver information for the selected ring (all asics).
164 int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,  in amdgpu_ring_init()  argument
177 	 * KIQ tasks get submitted directly to the ring.  in amdgpu_ring_init()
179 	if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)  in amdgpu_ring_init()
181 	else if (ring == &adev->sdma.instance[0].page)  in amdgpu_ring_init()
184 	if (ring->adev == NULL) {  in amdgpu_ring_init()
188 		ring->adev = adev;  in amdgpu_ring_init()
189 		ring->idx = adev->num_rings++;  in amdgpu_ring_init()
190 		adev->rings[ring->idx] = ring;  in amdgpu_ring_init()
191 		r = amdgpu_fence_driver_init_ring(ring, sched_hw_submission);  in amdgpu_ring_init()
196 	r = amdgpu_device_wb_get(adev, &ring->rptr_offs);  in amdgpu_ring_init()
198 		dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);  in amdgpu_ring_init()
202 	r = amdgpu_device_wb_get(adev, &ring->wptr_offs);  in amdgpu_ring_init()
204 		dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);  in amdgpu_ring_init()
208 	r = amdgpu_device_wb_get(adev, &ring->fence_offs);  in amdgpu_ring_init()
210 		dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);  in amdgpu_ring_init()
214 	r = amdgpu_device_wb_get(adev, &ring->trail_fence_offs);  in amdgpu_ring_init()
217 			"(%d) ring trail_fence_offs wb alloc failed\n", r);  in amdgpu_ring_init()
220 	ring->trail_fence_gpu_addr =  in amdgpu_ring_init()
221 		adev->wb.gpu_addr + (ring->trail_fence_offs * 4);  in amdgpu_ring_init()
222 	ring->trail_fence_cpu_addr = &adev->wb.wb[ring->trail_fence_offs];  in amdgpu_ring_init()
224 	r = amdgpu_device_wb_get(adev, &ring->cond_exe_offs);  in amdgpu_ring_init()
226 		dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r);  in amdgpu_ring_init()
229 	ring->cond_exe_gpu_addr = adev->wb.gpu_addr + (ring->cond_exe_offs * 4);  in amdgpu_ring_init()
230 	ring->cond_exe_cpu_addr = &adev->wb.wb[ring->cond_exe_offs];  in amdgpu_ring_init()
232 	*ring->cond_exe_cpu_addr = 1;  in amdgpu_ring_init()
234 	r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);  in amdgpu_ring_init()
240 	ring->ring_size = roundup_pow_of_two(max_dw * 4 * sched_hw_submission);  in amdgpu_ring_init()
242 	ring->buf_mask = (ring->ring_size / 4) - 1;  in amdgpu_ring_init()
243 	ring->ptr_mask = ring->funcs->support_64bit_ptrs ?  in amdgpu_ring_init()
244 		0xffffffffffffffff : ring->buf_mask;  in amdgpu_ring_init()
245 	/* Allocate ring buffer */  in amdgpu_ring_init()
246 	if (ring->ring_obj == NULL) {  in amdgpu_ring_init()
247 		r = amdgpu_bo_create_kernel(adev, ring->ring_size + ring->funcs->extra_dw, PAGE_SIZE,  in amdgpu_ring_init()
249 					    &ring->ring_obj,  in amdgpu_ring_init()
250 					    &ring->gpu_addr,  in amdgpu_ring_init()
251 					    (void **)&ring->ring);  in amdgpu_ring_init()
253 			dev_err(adev->dev, "(%d) ring create failed\n", r);  in amdgpu_ring_init()
256 		amdgpu_ring_clear_ring(ring);  in amdgpu_ring_init()
259 	ring->max_dw = max_dw;  in amdgpu_ring_init()
260 	ring->priority = DRM_SCHED_PRIORITY_NORMAL;  in amdgpu_ring_init()
261 	mutex_init(&ring->priority_mutex);  in amdgpu_ring_init()
263 	if (!ring->no_scheduler) {  in amdgpu_ring_init()
264 		hw_ip = ring->funcs->type;  in amdgpu_ring_init()
267 			&ring->sched;  in amdgpu_ring_init()
271 		atomic_set(&ring->num_jobs[i], 0);  in amdgpu_ring_init()
277  * amdgpu_ring_fini - tear down the driver ring struct.
280  * @ring: amdgpu_ring structure holding ring information
282  * Tear down the driver information for the selected ring (all asics).
284 void amdgpu_ring_fini(struct amdgpu_ring *ring)  in amdgpu_ring_fini()  argument
287 	/* Not to finish a ring which is not initialized */  in amdgpu_ring_fini()
288 	if (!(ring->adev) || !(ring->adev->rings[ring->idx]))  in amdgpu_ring_fini()
291 	ring->sched.ready = false;  in amdgpu_ring_fini()
293 	amdgpu_device_wb_free(ring->adev, ring->rptr_offs);  in amdgpu_ring_fini()
294 	amdgpu_device_wb_free(ring->adev, ring->wptr_offs);  in amdgpu_ring_fini()
296 	amdgpu_device_wb_free(ring->adev, ring->cond_exe_offs);  in amdgpu_ring_fini()
297 	amdgpu_device_wb_free(ring->adev, ring->fence_offs);  in amdgpu_ring_fini()
299 	amdgpu_bo_free_kernel(&ring->ring_obj,  in amdgpu_ring_fini()
300 			      &ring->gpu_addr,  in amdgpu_ring_fini()
301 			      (void **)&ring->ring);  in amdgpu_ring_fini()
303 	dma_fence_put(ring->vmid_wait);  in amdgpu_ring_fini()
304 	ring->vmid_wait = NULL;  in amdgpu_ring_fini()
305 	ring->me = 0;  in amdgpu_ring_fini()
307 	ring->adev->rings[ring->idx] = NULL;  in amdgpu_ring_fini()
311  * amdgpu_ring_emit_reg_write_reg_wait_helper - ring helper
322 void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,  in amdgpu_ring_emit_reg_write_reg_wait_helper()  argument
326 	amdgpu_ring_emit_wreg(ring, reg0, ref);  in amdgpu_ring_emit_reg_write_reg_wait_helper()
327 	amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);  in amdgpu_ring_emit_reg_write_reg_wait_helper()
331  * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
333  * @ring: ring to try the recovery on
337  * Tries to get a ring proceeding again when it is stuck.
339 bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,  in amdgpu_ring_soft_recovery()  argument
344 	if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)  in amdgpu_ring_soft_recovery()
347 	atomic_inc(&ring->adev->gpu_reset_counter);  in amdgpu_ring_soft_recovery()
350 		ring->funcs->soft_recovery(ring, vmid);  in amdgpu_ring_soft_recovery()
365  * followed by n-words of ring data
370 	struct amdgpu_ring *ring = file_inode(f)->i_private;  in amdgpu_debugfs_ring_read()  local
380 		early[0] = amdgpu_ring_get_rptr(ring) & ring->buf_mask;  in amdgpu_debugfs_ring_read()
381 		early[1] = amdgpu_ring_get_wptr(ring) & ring->buf_mask;  in amdgpu_debugfs_ring_read()
382 		early[2] = ring->wptr & ring->buf_mask;  in amdgpu_debugfs_ring_read()
395 		if (*pos >= (ring->ring_size + 12))  in amdgpu_debugfs_ring_read()
398 		value = ring->ring[(*pos - 12)/4];  in amdgpu_debugfs_ring_read()
420 			     struct amdgpu_ring *ring)  in amdgpu_debugfs_ring_init()  argument
427 	sprintf(name, "amdgpu_ring_%s", ring->name);  in amdgpu_debugfs_ring_init()
431 				  ring, &amdgpu_debugfs_ring_fops);  in amdgpu_debugfs_ring_init()
435 	i_size_write(ent->d_inode, ring->ring_size + 12);  in amdgpu_debugfs_ring_init()
436 	ring->ent = ent;  in amdgpu_debugfs_ring_init()
442  * amdgpu_ring_test_helper - tests ring and set sched readiness status
444  * @ring: ring to try the recovery on
446  * Tests ring and set sched readiness status
450 int amdgpu_ring_test_helper(struct amdgpu_ring *ring)  in amdgpu_ring_test_helper()  argument
452 	struct amdgpu_device *adev = ring->adev;  in amdgpu_ring_test_helper()
455 	r = amdgpu_ring_test_ring(ring);  in amdgpu_ring_test_helper()
457 		DRM_DEV_ERROR(adev->dev, "ring %s test failed (%d)\n",  in amdgpu_ring_test_helper()
458 			      ring->name, r);  in amdgpu_ring_test_helper()
460 		DRM_DEV_DEBUG(adev->dev, "ring test on %s succeeded\n",  in amdgpu_ring_test_helper()
461 			      ring->name);  in amdgpu_ring_test_helper()
463 	ring->sched.ready = !r;  in amdgpu_ring_test_helper()