1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  *          Christian König
28  */
29 #include <linux/seq_file.h>
30 #include <linux/slab.h>
31 #include <linux/uaccess.h>
32 #include <linux/debugfs.h>
33 
34 #include <drm/amdgpu_drm.h>
35 #include "amdgpu.h"
36 #include "atom.h"
37 
38 /*
39  * Rings
40  * Most engines on the GPU are fed via ring buffers.  Ring
41  * buffers are areas of GPU accessible memory that the host
42  * writes commands into and the GPU reads commands out of.
43  * There is a rptr (read pointer) that determines where the
44  * GPU is currently reading, and a wptr (write pointer)
45  * which determines where the host has written.  When the
46  * pointers are equal, the ring is idle.  When the host
47  * writes commands to the ring buffer, it increments the
48  * wptr.  The GPU then starts fetching commands and executes
49  * them until the pointers are equal again.
50  */
51 
52 /**
53  * amdgpu_ring_alloc - allocate space on the ring buffer
54  *
55  * @ring: amdgpu_ring structure holding ring information
56  * @ndw: number of dwords to allocate in the ring buffer
57  *
58  * Allocate @ndw dwords in the ring buffer (all asics).
59  * Returns 0 on success, error on failure.
60  */
61 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw)
62 {
63 	/* Align requested size with padding so unlock_commit can
64 	 * pad safely */
65 	ndw = (ndw + ring->funcs->align_mask) & ~ring->funcs->align_mask;
66 
67 	/* Make sure we aren't trying to allocate more space
68 	 * than the maximum for one submission
69 	 */
70 	if (WARN_ON_ONCE(ndw > ring->max_dw))
71 		return -ENOMEM;
72 
73 	ring->count_dw = ndw;
74 	ring->wptr_old = ring->wptr;
75 
76 	if (ring->funcs->begin_use)
77 		ring->funcs->begin_use(ring);
78 
79 	return 0;
80 }
81 
82 /** amdgpu_ring_insert_nop - insert NOP packets
83  *
84  * @ring: amdgpu_ring structure holding ring information
85  * @count: the number of NOP packets to insert
86  *
87  * This is the generic insert_nop function for rings except SDMA
88  */
89 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
90 {
91 	int i;
92 
93 	for (i = 0; i < count; i++)
94 		amdgpu_ring_write(ring, ring->funcs->nop);
95 }
96 
97 /**
98  * amdgpu_ring_generic_pad_ib - pad IB with NOP packets
99  *
100  * @ring: amdgpu_ring structure holding ring information
101  * @ib: IB to add NOP packets to
102  *
103  * This is the generic pad_ib function for rings except SDMA
104  */
105 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
106 {
107 	while (ib->length_dw & ring->funcs->align_mask)
108 		ib->ptr[ib->length_dw++] = ring->funcs->nop;
109 }
110 
111 /**
112  * amdgpu_ring_commit - tell the GPU to execute the new
113  * commands on the ring buffer
114  *
115  * @ring: amdgpu_ring structure holding ring information
116  *
117  * Update the wptr (write pointer) to tell the GPU to
118  * execute new commands on the ring buffer (all asics).
119  */
120 void amdgpu_ring_commit(struct amdgpu_ring *ring)
121 {
122 	uint32_t count;
123 
124 	/* We pad to match fetch size */
125 	count = ring->funcs->align_mask + 1 -
126 		(ring->wptr & ring->funcs->align_mask);
127 	count %= ring->funcs->align_mask + 1;
128 	ring->funcs->insert_nop(ring, count);
129 
130 	mb();
131 	amdgpu_ring_set_wptr(ring);
132 
133 	if (ring->funcs->end_use)
134 		ring->funcs->end_use(ring);
135 }
136 
137 /**
138  * amdgpu_ring_undo - reset the wptr
139  *
140  * @ring: amdgpu_ring structure holding ring information
141  *
142  * Reset the driver's copy of the wptr (all asics).
143  */
144 void amdgpu_ring_undo(struct amdgpu_ring *ring)
145 {
146 	ring->wptr = ring->wptr_old;
147 
148 	if (ring->funcs->end_use)
149 		ring->funcs->end_use(ring);
150 }
151 
152 #define amdgpu_ring_get_gpu_addr(ring, offset)				\
153 	(ring->is_mes_queue ?						\
154 	 (ring->mes_ctx->meta_data_gpu_addr + offset) :			\
155 	 (ring->adev->wb.gpu_addr + offset * 4))
156 
157 #define amdgpu_ring_get_cpu_addr(ring, offset)				\
158 	(ring->is_mes_queue ?						\
159 	 (void *)((uint8_t *)(ring->mes_ctx->meta_data_ptr) + offset) : \
160 	 (&ring->adev->wb.wb[offset]))
161 
162 /**
163  * amdgpu_ring_init - init driver ring struct.
164  *
165  * @adev: amdgpu_device pointer
166  * @ring: amdgpu_ring structure holding ring information
167  * @max_dw: maximum number of dw for ring alloc
168  * @irq_src: interrupt source to use for this ring
169  * @irq_type: interrupt type to use for this ring
170  * @hw_prio: ring priority (NORMAL/HIGH)
171  * @sched_score: optional score atomic shared with other schedulers
172  *
173  * Initialize the driver information for the selected ring (all asics).
174  * Returns 0 on success, error on failure.
175  */
176 int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
177 		     unsigned int max_dw, struct amdgpu_irq_src *irq_src,
178 		     unsigned int irq_type, unsigned int hw_prio,
179 		     atomic_t *sched_score)
180 {
181 	int r;
182 	int sched_hw_submission = amdgpu_sched_hw_submission;
183 	u32 *num_sched;
184 	u32 hw_ip;
185 
186 	/* Set the hw submission limit higher for KIQ because
187 	 * it's used for a number of gfx/compute tasks by both
188 	 * KFD and KGD which may have outstanding fences and
189 	 * it doesn't really use the gpu scheduler anyway;
190 	 * KIQ tasks get submitted directly to the ring.
191 	 */
192 	if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
193 		sched_hw_submission = max(sched_hw_submission, 256);
194 	else if (ring == &adev->sdma.instance[0].page)
195 		sched_hw_submission = 256;
196 
197 	if (ring->adev == NULL) {
198 		if (adev->num_rings >= AMDGPU_MAX_RINGS)
199 			return -EINVAL;
200 
201 		ring->adev = adev;
202 		ring->num_hw_submission = sched_hw_submission;
203 		ring->sched_score = sched_score;
204 		ring->vmid_wait = dma_fence_get_stub();
205 
206 		if (!ring->is_mes_queue) {
207 			ring->idx = adev->num_rings++;
208 			adev->rings[ring->idx] = ring;
209 		}
210 
211 		r = amdgpu_fence_driver_init_ring(ring);
212 		if (r)
213 			return r;
214 	}
215 
216 	if (ring->is_mes_queue) {
217 		ring->rptr_offs = amdgpu_mes_ctx_get_offs(ring,
218 				AMDGPU_MES_CTX_RPTR_OFFS);
219 		ring->wptr_offs = amdgpu_mes_ctx_get_offs(ring,
220 				AMDGPU_MES_CTX_WPTR_OFFS);
221 		ring->fence_offs = amdgpu_mes_ctx_get_offs(ring,
222 				AMDGPU_MES_CTX_FENCE_OFFS);
223 		ring->trail_fence_offs = amdgpu_mes_ctx_get_offs(ring,
224 				AMDGPU_MES_CTX_TRAIL_FENCE_OFFS);
225 		ring->cond_exe_offs = amdgpu_mes_ctx_get_offs(ring,
226 				AMDGPU_MES_CTX_COND_EXE_OFFS);
227 	} else {
228 		r = amdgpu_device_wb_get(adev, &ring->rptr_offs);
229 		if (r) {
230 			dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
231 			return r;
232 		}
233 
234 		r = amdgpu_device_wb_get(adev, &ring->wptr_offs);
235 		if (r) {
236 			dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
237 			return r;
238 		}
239 
240 		r = amdgpu_device_wb_get(adev, &ring->fence_offs);
241 		if (r) {
242 			dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
243 			return r;
244 		}
245 
246 		r = amdgpu_device_wb_get(adev, &ring->trail_fence_offs);
247 		if (r) {
248 			dev_err(adev->dev, "(%d) ring trail_fence_offs wb alloc failed\n", r);
249 			return r;
250 		}
251 
252 		r = amdgpu_device_wb_get(adev, &ring->cond_exe_offs);
253 		if (r) {
254 			dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r);
255 			return r;
256 		}
257 	}
258 
259 	ring->fence_gpu_addr =
260 		amdgpu_ring_get_gpu_addr(ring, ring->fence_offs);
261 	ring->fence_cpu_addr =
262 		amdgpu_ring_get_cpu_addr(ring, ring->fence_offs);
263 
264 	ring->rptr_gpu_addr =
265 		amdgpu_ring_get_gpu_addr(ring, ring->rptr_offs);
266 	ring->rptr_cpu_addr =
267 		amdgpu_ring_get_cpu_addr(ring, ring->rptr_offs);
268 
269 	ring->wptr_gpu_addr =
270 		amdgpu_ring_get_gpu_addr(ring, ring->wptr_offs);
271 	ring->wptr_cpu_addr =
272 		amdgpu_ring_get_cpu_addr(ring, ring->wptr_offs);
273 
274 	ring->trail_fence_gpu_addr =
275 		amdgpu_ring_get_gpu_addr(ring, ring->trail_fence_offs);
276 	ring->trail_fence_cpu_addr =
277 		amdgpu_ring_get_cpu_addr(ring, ring->trail_fence_offs);
278 
279 	ring->cond_exe_gpu_addr =
280 		amdgpu_ring_get_gpu_addr(ring, ring->cond_exe_offs);
281 	ring->cond_exe_cpu_addr =
282 		amdgpu_ring_get_cpu_addr(ring, ring->cond_exe_offs);
283 
284 	/* always set cond_exec_polling to CONTINUE */
285 	*ring->cond_exe_cpu_addr = 1;
286 
287 	r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);
288 	if (r) {
289 		dev_err(adev->dev, "failed initializing fences (%d).\n", r);
290 		return r;
291 	}
292 
293 	ring->ring_size = roundup_pow_of_two(max_dw * 4 * sched_hw_submission);
294 
295 	ring->buf_mask = (ring->ring_size / 4) - 1;
296 	ring->ptr_mask = ring->funcs->support_64bit_ptrs ?
297 		0xffffffffffffffff : ring->buf_mask;
298 
299 	/* Allocate ring buffer */
300 	if (ring->is_mes_queue) {
301 		int offset = 0;
302 
303 		BUG_ON(ring->ring_size > PAGE_SIZE*4);
304 
305 		offset = amdgpu_mes_ctx_get_offs(ring,
306 					 AMDGPU_MES_CTX_RING_OFFS);
307 		ring->gpu_addr = amdgpu_mes_ctx_get_offs_gpu_addr(ring, offset);
308 		ring->ring = amdgpu_mes_ctx_get_offs_cpu_addr(ring, offset);
309 		amdgpu_ring_clear_ring(ring);
310 
311 	} else if (ring->ring_obj == NULL) {
312 		r = amdgpu_bo_create_kernel(adev, ring->ring_size + ring->funcs->extra_dw, PAGE_SIZE,
313 					    AMDGPU_GEM_DOMAIN_GTT,
314 					    &ring->ring_obj,
315 					    &ring->gpu_addr,
316 					    (void **)&ring->ring);
317 		if (r) {
318 			dev_err(adev->dev, "(%d) ring create failed\n", r);
319 			return r;
320 		}
321 		amdgpu_ring_clear_ring(ring);
322 	}
323 
324 	ring->max_dw = max_dw;
325 	ring->hw_prio = hw_prio;
326 
327 	if (!ring->no_scheduler) {
328 		hw_ip = ring->funcs->type;
329 		num_sched = &adev->gpu_sched[hw_ip][hw_prio].num_scheds;
330 		adev->gpu_sched[hw_ip][hw_prio].sched[(*num_sched)++] =
331 			&ring->sched;
332 	}
333 
334 	return 0;
335 }
336 
337 /**
338  * amdgpu_ring_fini - tear down the driver ring struct.
339  *
340  * @ring: amdgpu_ring structure holding ring information
341  *
342  * Tear down the driver information for the selected ring (all asics).
343  */
344 void amdgpu_ring_fini(struct amdgpu_ring *ring)
345 {
346 
347 	/* Not to finish a ring which is not initialized */
348 	if (!(ring->adev) ||
349 	    (!ring->is_mes_queue && !(ring->adev->rings[ring->idx])))
350 		return;
351 
352 	ring->sched.ready = false;
353 
354 	if (!ring->is_mes_queue) {
355 		amdgpu_device_wb_free(ring->adev, ring->rptr_offs);
356 		amdgpu_device_wb_free(ring->adev, ring->wptr_offs);
357 
358 		amdgpu_device_wb_free(ring->adev, ring->cond_exe_offs);
359 		amdgpu_device_wb_free(ring->adev, ring->fence_offs);
360 
361 		amdgpu_bo_free_kernel(&ring->ring_obj,
362 				      &ring->gpu_addr,
363 				      (void **)&ring->ring);
364 	}
365 
366 	dma_fence_put(ring->vmid_wait);
367 	ring->vmid_wait = NULL;
368 	ring->me = 0;
369 
370 	if (!ring->is_mes_queue)
371 		ring->adev->rings[ring->idx] = NULL;
372 }
373 
374 /**
375  * amdgpu_ring_emit_reg_write_reg_wait_helper - ring helper
376  *
377  * @ring: ring to write to
378  * @reg0: register to write
379  * @reg1: register to wait on
380  * @ref: reference value to write/wait on
381  * @mask: mask to wait on
382  *
383  * Helper for rings that don't support write and wait in a
384  * single oneshot packet.
385  */
386 void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
387 						uint32_t reg0, uint32_t reg1,
388 						uint32_t ref, uint32_t mask)
389 {
390 	amdgpu_ring_emit_wreg(ring, reg0, ref);
391 	amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);
392 }
393 
394 /**
395  * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
396  *
397  * @ring: ring to try the recovery on
398  * @vmid: VMID we try to get going again
399  * @fence: timedout fence
400  *
401  * Tries to get a ring proceeding again when it is stuck.
402  */
403 bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
404 			       struct dma_fence *fence)
405 {
406 	ktime_t deadline = ktime_add_us(ktime_get(), 10000);
407 
408 	if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)
409 		return false;
410 
411 	atomic_inc(&ring->adev->gpu_reset_counter);
412 	while (!dma_fence_is_signaled(fence) &&
413 	       ktime_to_ns(ktime_sub(deadline, ktime_get())) > 0)
414 		ring->funcs->soft_recovery(ring, vmid);
415 
416 	return dma_fence_is_signaled(fence);
417 }
418 
419 /*
420  * Debugfs info
421  */
422 #if defined(CONFIG_DEBUG_FS)
423 
424 /* Layout of file is 12 bytes consisting of
425  * - rptr
426  * - wptr
427  * - driver's copy of wptr
428  *
429  * followed by n-words of ring data
430  */
431 static ssize_t amdgpu_debugfs_ring_read(struct file *f, char __user *buf,
432 					size_t size, loff_t *pos)
433 {
434 	struct amdgpu_ring *ring = file_inode(f)->i_private;
435 	int r, i;
436 	uint32_t value, result, early[3];
437 
438 	if (*pos & 3 || size & 3)
439 		return -EINVAL;
440 
441 	result = 0;
442 
443 	if (*pos < 12) {
444 		early[0] = amdgpu_ring_get_rptr(ring) & ring->buf_mask;
445 		early[1] = amdgpu_ring_get_wptr(ring) & ring->buf_mask;
446 		early[2] = ring->wptr & ring->buf_mask;
447 		for (i = *pos / 4; i < 3 && size; i++) {
448 			r = put_user(early[i], (uint32_t *)buf);
449 			if (r)
450 				return r;
451 			buf += 4;
452 			result += 4;
453 			size -= 4;
454 			*pos += 4;
455 		}
456 	}
457 
458 	while (size) {
459 		if (*pos >= (ring->ring_size + 12))
460 			return result;
461 
462 		value = ring->ring[(*pos - 12)/4];
463 		r = put_user(value, (uint32_t *)buf);
464 		if (r)
465 			return r;
466 		buf += 4;
467 		result += 4;
468 		size -= 4;
469 		*pos += 4;
470 	}
471 
472 	return result;
473 }
474 
475 static const struct file_operations amdgpu_debugfs_ring_fops = {
476 	.owner = THIS_MODULE,
477 	.read = amdgpu_debugfs_ring_read,
478 	.llseek = default_llseek
479 };
480 
481 #endif
482 
483 void amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
484 			      struct amdgpu_ring *ring)
485 {
486 #if defined(CONFIG_DEBUG_FS)
487 	struct drm_minor *minor = adev_to_drm(adev)->primary;
488 	struct dentry *root = minor->debugfs_root;
489 	char name[32];
490 
491 	sprintf(name, "amdgpu_ring_%s", ring->name);
492 	debugfs_create_file_size(name, S_IFREG | S_IRUGO, root, ring,
493 				 &amdgpu_debugfs_ring_fops,
494 				 ring->ring_size + 12);
495 
496 #endif
497 }
498 
499 /**
500  * amdgpu_ring_test_helper - tests ring and set sched readiness status
501  *
502  * @ring: ring to try the recovery on
503  *
504  * Tests ring and set sched readiness status
505  *
506  * Returns 0 on success, error on failure.
507  */
508 int amdgpu_ring_test_helper(struct amdgpu_ring *ring)
509 {
510 	struct amdgpu_device *adev = ring->adev;
511 	int r;
512 
513 	r = amdgpu_ring_test_ring(ring);
514 	if (r)
515 		DRM_DEV_ERROR(adev->dev, "ring %s test failed (%d)\n",
516 			      ring->name, r);
517 	else
518 		DRM_DEV_DEBUG(adev->dev, "ring test on %s succeeded\n",
519 			      ring->name);
520 
521 	ring->sched.ready = !r;
522 	return r;
523 }
524 
525 static void amdgpu_ring_to_mqd_prop(struct amdgpu_ring *ring,
526 				    struct amdgpu_mqd_prop *prop)
527 {
528 	struct amdgpu_device *adev = ring->adev;
529 
530 	memset(prop, 0, sizeof(*prop));
531 
532 	prop->mqd_gpu_addr = ring->mqd_gpu_addr;
533 	prop->hqd_base_gpu_addr = ring->gpu_addr;
534 	prop->rptr_gpu_addr = ring->rptr_gpu_addr;
535 	prop->wptr_gpu_addr = ring->wptr_gpu_addr;
536 	prop->queue_size = ring->ring_size;
537 	prop->eop_gpu_addr = ring->eop_gpu_addr;
538 	prop->use_doorbell = ring->use_doorbell;
539 	prop->doorbell_index = ring->doorbell_index;
540 
541 	/* map_queues packet doesn't need activate the queue,
542 	 * so only kiq need set this field.
543 	 */
544 	prop->hqd_active = ring->funcs->type == AMDGPU_RING_TYPE_KIQ;
545 
546 	if ((ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE &&
547 	     amdgpu_gfx_is_high_priority_compute_queue(adev, ring)) ||
548 	    (ring->funcs->type == AMDGPU_RING_TYPE_GFX &&
549 	     amdgpu_gfx_is_high_priority_graphics_queue(adev, ring))) {
550 		prop->hqd_pipe_priority = AMDGPU_GFX_PIPE_PRIO_HIGH;
551 		prop->hqd_queue_priority = AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
552 	}
553 }
554 
555 int amdgpu_ring_init_mqd(struct amdgpu_ring *ring)
556 {
557 	struct amdgpu_device *adev = ring->adev;
558 	struct amdgpu_mqd *mqd_mgr;
559 	struct amdgpu_mqd_prop prop;
560 
561 	amdgpu_ring_to_mqd_prop(ring, &prop);
562 
563 	ring->wptr = 0;
564 
565 	if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
566 		mqd_mgr = &adev->mqds[AMDGPU_HW_IP_COMPUTE];
567 	else
568 		mqd_mgr = &adev->mqds[ring->funcs->type];
569 
570 	return mqd_mgr->init_mqd(adev, ring->mqd_ptr, &prop);
571 }
572