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d38ceaf9 AD |
1 | /* |
2 | * Copyright 2009 Jerome Glisse. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * Permission is hereby granted, free of charge, to any person obtaining a | |
6 | * copy of this software and associated documentation files (the | |
7 | * "Software"), to deal in the Software without restriction, including | |
8 | * without limitation the rights to use, copy, modify, merge, publish, | |
9 | * distribute, sub license, and/or sell copies of the Software, and to | |
10 | * permit persons to whom the Software is furnished to do so, subject to | |
11 | * the following conditions: | |
12 | * | |
13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
16 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
17 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
18 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
19 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
20 | * | |
21 | * The above copyright notice and this permission notice (including the | |
22 | * next paragraph) shall be included in all copies or substantial portions | |
23 | * of the Software. | |
24 | * | |
25 | */ | |
26 | /* | |
27 | * Authors: | |
28 | * Jerome Glisse <glisse@freedesktop.org> | |
29 | * Dave Airlie | |
30 | */ | |
31 | #include <linux/seq_file.h> | |
32 | #include <linux/atomic.h> | |
33 | #include <linux/wait.h> | |
34 | #include <linux/kref.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/firmware.h> | |
37 | #include <drm/drmP.h> | |
38 | #include "amdgpu.h" | |
39 | #include "amdgpu_trace.h" | |
40 | ||
41 | /* | |
42 | * Fences | |
43 | * Fences mark an event in the GPUs pipeline and are used | |
44 | * for GPU/CPU synchronization. When the fence is written, | |
45 | * it is expected that all buffers associated with that fence | |
46 | * are no longer in use by the associated ring on the GPU and | |
47 | * that the the relevant GPU caches have been flushed. | |
48 | */ | |
49 | ||
22e5a2f4 CK |
50 | struct amdgpu_fence { |
51 | struct fence base; | |
52 | ||
53 | /* RB, DMA, etc. */ | |
54 | struct amdgpu_ring *ring; | |
22e5a2f4 CK |
55 | }; |
56 | ||
b49c84a5 CZ |
57 | static struct kmem_cache *amdgpu_fence_slab; |
58 | static atomic_t amdgpu_fence_slab_ref = ATOMIC_INIT(0); | |
59 | ||
22e5a2f4 CK |
60 | /* |
61 | * Cast helper | |
62 | */ | |
63 | static const struct fence_ops amdgpu_fence_ops; | |
64 | static inline struct amdgpu_fence *to_amdgpu_fence(struct fence *f) | |
65 | { | |
66 | struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base); | |
67 | ||
68 | if (__f->base.ops == &amdgpu_fence_ops) | |
69 | return __f; | |
70 | ||
71 | return NULL; | |
72 | } | |
73 | ||
d38ceaf9 AD |
74 | /** |
75 | * amdgpu_fence_write - write a fence value | |
76 | * | |
77 | * @ring: ring the fence is associated with | |
78 | * @seq: sequence number to write | |
79 | * | |
80 | * Writes a fence value to memory (all asics). | |
81 | */ | |
82 | static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq) | |
83 | { | |
84 | struct amdgpu_fence_driver *drv = &ring->fence_drv; | |
85 | ||
86 | if (drv->cpu_addr) | |
87 | *drv->cpu_addr = cpu_to_le32(seq); | |
88 | } | |
89 | ||
90 | /** | |
91 | * amdgpu_fence_read - read a fence value | |
92 | * | |
93 | * @ring: ring the fence is associated with | |
94 | * | |
95 | * Reads a fence value from memory (all asics). | |
96 | * Returns the value of the fence read from memory. | |
97 | */ | |
98 | static u32 amdgpu_fence_read(struct amdgpu_ring *ring) | |
99 | { | |
100 | struct amdgpu_fence_driver *drv = &ring->fence_drv; | |
101 | u32 seq = 0; | |
102 | ||
103 | if (drv->cpu_addr) | |
104 | seq = le32_to_cpu(*drv->cpu_addr); | |
105 | else | |
742c085f | 106 | seq = atomic_read(&drv->last_seq); |
d38ceaf9 AD |
107 | |
108 | return seq; | |
109 | } | |
110 | ||
d38ceaf9 AD |
111 | /** |
112 | * amdgpu_fence_emit - emit a fence on the requested ring | |
113 | * | |
114 | * @ring: ring the fence is associated with | |
364beb2c | 115 | * @f: resulting fence object |
d38ceaf9 AD |
116 | * |
117 | * Emits a fence command on the requested ring (all asics). | |
118 | * Returns 0 on success, -ENOMEM on failure. | |
119 | */ | |
364beb2c | 120 | int amdgpu_fence_emit(struct amdgpu_ring *ring, struct fence **f) |
d38ceaf9 AD |
121 | { |
122 | struct amdgpu_device *adev = ring->adev; | |
364beb2c | 123 | struct amdgpu_fence *fence; |
fc387a0b | 124 | struct fence *old, **ptr; |
742c085f | 125 | uint32_t seq; |
d38ceaf9 | 126 | |
364beb2c CK |
127 | fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL); |
128 | if (fence == NULL) | |
d38ceaf9 | 129 | return -ENOMEM; |
364beb2c | 130 | |
742c085f | 131 | seq = ++ring->fence_drv.sync_seq; |
364beb2c CK |
132 | fence->ring = ring; |
133 | fence_init(&fence->base, &amdgpu_fence_ops, | |
4a7d74f1 | 134 | &ring->fence_drv.lock, |
364beb2c | 135 | adev->fence_context + ring->idx, |
742c085f | 136 | seq); |
890ee23f | 137 | amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr, |
742c085f | 138 | seq, AMDGPU_FENCE_FLAG_INT); |
c89377d1 | 139 | |
742c085f | 140 | ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask]; |
c89377d1 CK |
141 | /* This function can't be called concurrently anyway, otherwise |
142 | * emitting the fence would mess up the hardware ring buffer. | |
143 | */ | |
fc387a0b CZ |
144 | old = rcu_dereference_protected(*ptr, 1); |
145 | if (old && !fence_is_signaled(old)) { | |
146 | DRM_INFO("rcu slot is busy\n"); | |
147 | fence_wait(old, false); | |
148 | } | |
c89377d1 CK |
149 | |
150 | rcu_assign_pointer(*ptr, fence_get(&fence->base)); | |
151 | ||
364beb2c | 152 | *f = &fence->base; |
c89377d1 | 153 | |
d38ceaf9 AD |
154 | return 0; |
155 | } | |
156 | ||
c2776afe CK |
157 | /** |
158 | * amdgpu_fence_schedule_fallback - schedule fallback check | |
159 | * | |
160 | * @ring: pointer to struct amdgpu_ring | |
161 | * | |
162 | * Start a timer as fallback to our interrupts. | |
163 | */ | |
164 | static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring) | |
165 | { | |
166 | mod_timer(&ring->fence_drv.fallback_timer, | |
167 | jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT); | |
168 | } | |
169 | ||
d38ceaf9 | 170 | /** |
ca08e04d | 171 | * amdgpu_fence_process - check for fence activity |
d38ceaf9 AD |
172 | * |
173 | * @ring: pointer to struct amdgpu_ring | |
174 | * | |
175 | * Checks the current fence value and calculates the last | |
ca08e04d CK |
176 | * signalled fence value. Wakes the fence queue if the |
177 | * sequence number has increased. | |
d38ceaf9 | 178 | */ |
ca08e04d | 179 | void amdgpu_fence_process(struct amdgpu_ring *ring) |
d38ceaf9 | 180 | { |
4a7d74f1 | 181 | struct amdgpu_fence_driver *drv = &ring->fence_drv; |
742c085f | 182 | uint32_t seq, last_seq; |
4a7d74f1 | 183 | int r; |
d38ceaf9 | 184 | |
d38ceaf9 | 185 | do { |
742c085f | 186 | last_seq = atomic_read(&ring->fence_drv.last_seq); |
d38ceaf9 | 187 | seq = amdgpu_fence_read(ring); |
d38ceaf9 | 188 | |
742c085f | 189 | } while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq); |
d38ceaf9 | 190 | |
742c085f | 191 | if (seq != ring->fence_drv.sync_seq) |
c2776afe | 192 | amdgpu_fence_schedule_fallback(ring); |
d38ceaf9 | 193 | |
4a7d74f1 CK |
194 | while (last_seq != seq) { |
195 | struct fence *fence, **ptr; | |
196 | ||
197 | ptr = &drv->fences[++last_seq & drv->num_fences_mask]; | |
198 | ||
199 | /* There is always exactly one thread signaling this fence slot */ | |
200 | fence = rcu_dereference_protected(*ptr, 1); | |
201 | rcu_assign_pointer(*ptr, NULL); | |
202 | ||
203 | BUG_ON(!fence); | |
204 | ||
205 | r = fence_signal(fence); | |
206 | if (!r) | |
207 | FENCE_TRACE(fence, "signaled from irq context\n"); | |
208 | else | |
209 | BUG(); | |
210 | ||
211 | fence_put(fence); | |
212 | } | |
d38ceaf9 AD |
213 | } |
214 | ||
215 | /** | |
c2776afe | 216 | * amdgpu_fence_fallback - fallback for hardware interrupts |
d38ceaf9 | 217 | * |
c2776afe | 218 | * @work: delayed work item |
d38ceaf9 | 219 | * |
c2776afe | 220 | * Checks for fence activity. |
d38ceaf9 | 221 | */ |
c2776afe | 222 | static void amdgpu_fence_fallback(unsigned long arg) |
d38ceaf9 | 223 | { |
c2776afe CK |
224 | struct amdgpu_ring *ring = (void *)arg; |
225 | ||
226 | amdgpu_fence_process(ring); | |
d38ceaf9 AD |
227 | } |
228 | ||
d38ceaf9 AD |
229 | /** |
230 | * amdgpu_fence_wait_empty - wait for all fences to signal | |
231 | * | |
232 | * @adev: amdgpu device pointer | |
233 | * @ring: ring index the fence is associated with | |
234 | * | |
235 | * Wait for all fences on the requested ring to signal (all asics). | |
236 | * Returns 0 if the fences have passed, error for all other cases. | |
d38ceaf9 AD |
237 | */ |
238 | int amdgpu_fence_wait_empty(struct amdgpu_ring *ring) | |
239 | { | |
f09c2be4 CK |
240 | uint64_t seq = ACCESS_ONCE(ring->fence_drv.sync_seq); |
241 | struct fence *fence, **ptr; | |
242 | int r; | |
00d2a2b2 | 243 | |
7f06c236 | 244 | if (!seq) |
d38ceaf9 AD |
245 | return 0; |
246 | ||
f09c2be4 CK |
247 | ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask]; |
248 | rcu_read_lock(); | |
249 | fence = rcu_dereference(*ptr); | |
250 | if (!fence || !fence_get_rcu(fence)) { | |
251 | rcu_read_unlock(); | |
252 | return 0; | |
253 | } | |
254 | rcu_read_unlock(); | |
255 | ||
256 | r = fence_wait(fence, false); | |
257 | fence_put(fence); | |
258 | return r; | |
d38ceaf9 AD |
259 | } |
260 | ||
d38ceaf9 AD |
261 | /** |
262 | * amdgpu_fence_count_emitted - get the count of emitted fences | |
263 | * | |
264 | * @ring: ring the fence is associated with | |
265 | * | |
266 | * Get the number of fences emitted on the requested ring (all asics). | |
267 | * Returns the number of emitted fences on the ring. Used by the | |
268 | * dynpm code to ring track activity. | |
269 | */ | |
270 | unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring) | |
271 | { | |
272 | uint64_t emitted; | |
273 | ||
274 | /* We are not protected by ring lock when reading the last sequence | |
275 | * but it's ok to report slightly wrong fence count here. | |
276 | */ | |
277 | amdgpu_fence_process(ring); | |
742c085f CK |
278 | emitted = 0x100000000ull; |
279 | emitted -= atomic_read(&ring->fence_drv.last_seq); | |
280 | emitted += ACCESS_ONCE(ring->fence_drv.sync_seq); | |
281 | return lower_32_bits(emitted); | |
d38ceaf9 AD |
282 | } |
283 | ||
d38ceaf9 AD |
284 | /** |
285 | * amdgpu_fence_driver_start_ring - make the fence driver | |
286 | * ready for use on the requested ring. | |
287 | * | |
288 | * @ring: ring to start the fence driver on | |
289 | * @irq_src: interrupt source to use for this ring | |
290 | * @irq_type: interrupt type to use for this ring | |
291 | * | |
292 | * Make the fence driver ready for processing (all asics). | |
293 | * Not all asics have all rings, so each asic will only | |
294 | * start the fence driver on the rings it has. | |
295 | * Returns 0 for success, errors for failure. | |
296 | */ | |
297 | int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring, | |
298 | struct amdgpu_irq_src *irq_src, | |
299 | unsigned irq_type) | |
300 | { | |
301 | struct amdgpu_device *adev = ring->adev; | |
302 | uint64_t index; | |
303 | ||
304 | if (ring != &adev->uvd.ring) { | |
305 | ring->fence_drv.cpu_addr = &adev->wb.wb[ring->fence_offs]; | |
306 | ring->fence_drv.gpu_addr = adev->wb.gpu_addr + (ring->fence_offs * 4); | |
307 | } else { | |
308 | /* put fence directly behind firmware */ | |
309 | index = ALIGN(adev->uvd.fw->size, 8); | |
310 | ring->fence_drv.cpu_addr = adev->uvd.cpu_addr + index; | |
311 | ring->fence_drv.gpu_addr = adev->uvd.gpu_addr + index; | |
312 | } | |
742c085f | 313 | amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq)); |
c6a4079b CZ |
314 | amdgpu_irq_get(adev, irq_src, irq_type); |
315 | ||
d38ceaf9 AD |
316 | ring->fence_drv.irq_src = irq_src; |
317 | ring->fence_drv.irq_type = irq_type; | |
c6a4079b CZ |
318 | ring->fence_drv.initialized = true; |
319 | ||
d38ceaf9 AD |
320 | dev_info(adev->dev, "fence driver on ring %d use gpu addr 0x%016llx, " |
321 | "cpu addr 0x%p\n", ring->idx, | |
322 | ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /** | |
327 | * amdgpu_fence_driver_init_ring - init the fence driver | |
328 | * for the requested ring. | |
329 | * | |
330 | * @ring: ring to init the fence driver on | |
e6151a08 | 331 | * @num_hw_submission: number of entries on the hardware queue |
d38ceaf9 AD |
332 | * |
333 | * Init the fence driver for the requested ring (all asics). | |
334 | * Helper function for amdgpu_fence_driver_init(). | |
335 | */ | |
e6151a08 CK |
336 | int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring, |
337 | unsigned num_hw_submission) | |
d38ceaf9 | 338 | { |
cadf97b1 | 339 | long timeout; |
5907a0d8 | 340 | int r; |
d38ceaf9 | 341 | |
e6151a08 CK |
342 | /* Check that num_hw_submission is a power of two */ |
343 | if ((num_hw_submission & (num_hw_submission - 1)) != 0) | |
344 | return -EINVAL; | |
345 | ||
d38ceaf9 AD |
346 | ring->fence_drv.cpu_addr = NULL; |
347 | ring->fence_drv.gpu_addr = 0; | |
5907a0d8 | 348 | ring->fence_drv.sync_seq = 0; |
742c085f | 349 | atomic_set(&ring->fence_drv.last_seq, 0); |
d38ceaf9 AD |
350 | ring->fence_drv.initialized = false; |
351 | ||
c2776afe CK |
352 | setup_timer(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, |
353 | (unsigned long)ring); | |
b80d8475 | 354 | |
c89377d1 | 355 | ring->fence_drv.num_fences_mask = num_hw_submission - 1; |
4a7d74f1 | 356 | spin_lock_init(&ring->fence_drv.lock); |
c89377d1 CK |
357 | ring->fence_drv.fences = kcalloc(num_hw_submission, sizeof(void *), |
358 | GFP_KERNEL); | |
359 | if (!ring->fence_drv.fences) | |
360 | return -ENOMEM; | |
5ec92a76 | 361 | |
cadf97b1 CZ |
362 | timeout = msecs_to_jiffies(amdgpu_lockup_timeout); |
363 | if (timeout == 0) { | |
364 | /* | |
365 | * FIXME: | |
366 | * Delayed workqueue cannot use it directly, | |
367 | * so the scheduler will not use delayed workqueue if | |
368 | * MAX_SCHEDULE_TIMEOUT is set. | |
369 | * Currently keep it simple and silly. | |
370 | */ | |
371 | timeout = MAX_SCHEDULE_TIMEOUT; | |
372 | } | |
373 | r = amd_sched_init(&ring->sched, &amdgpu_sched_ops, | |
e6151a08 | 374 | num_hw_submission, |
cadf97b1 CZ |
375 | timeout, ring->name); |
376 | if (r) { | |
377 | DRM_ERROR("Failed to create scheduler on ring %s.\n", | |
378 | ring->name); | |
379 | return r; | |
b80d8475 | 380 | } |
4f839a24 CK |
381 | |
382 | return 0; | |
d38ceaf9 AD |
383 | } |
384 | ||
385 | /** | |
386 | * amdgpu_fence_driver_init - init the fence driver | |
387 | * for all possible rings. | |
388 | * | |
389 | * @adev: amdgpu device pointer | |
390 | * | |
391 | * Init the fence driver for all possible rings (all asics). | |
392 | * Not all asics have all rings, so each asic will only | |
393 | * start the fence driver on the rings it has using | |
394 | * amdgpu_fence_driver_start_ring(). | |
395 | * Returns 0 for success. | |
396 | */ | |
397 | int amdgpu_fence_driver_init(struct amdgpu_device *adev) | |
398 | { | |
b49c84a5 CZ |
399 | if (atomic_inc_return(&amdgpu_fence_slab_ref) == 1) { |
400 | amdgpu_fence_slab = kmem_cache_create( | |
401 | "amdgpu_fence", sizeof(struct amdgpu_fence), 0, | |
402 | SLAB_HWCACHE_ALIGN, NULL); | |
403 | if (!amdgpu_fence_slab) | |
404 | return -ENOMEM; | |
405 | } | |
d38ceaf9 AD |
406 | if (amdgpu_debugfs_fence_init(adev)) |
407 | dev_err(adev->dev, "fence debugfs file creation failed\n"); | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | /** | |
413 | * amdgpu_fence_driver_fini - tear down the fence driver | |
414 | * for all possible rings. | |
415 | * | |
416 | * @adev: amdgpu device pointer | |
417 | * | |
418 | * Tear down the fence driver for all possible rings (all asics). | |
419 | */ | |
420 | void amdgpu_fence_driver_fini(struct amdgpu_device *adev) | |
421 | { | |
c89377d1 CK |
422 | unsigned i, j; |
423 | int r; | |
d38ceaf9 | 424 | |
d38ceaf9 AD |
425 | for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
426 | struct amdgpu_ring *ring = adev->rings[i]; | |
c2776afe | 427 | |
d38ceaf9 AD |
428 | if (!ring || !ring->fence_drv.initialized) |
429 | continue; | |
430 | r = amdgpu_fence_wait_empty(ring); | |
431 | if (r) { | |
432 | /* no need to trigger GPU reset as we are unloading */ | |
433 | amdgpu_fence_driver_force_completion(adev); | |
434 | } | |
c6a4079b CZ |
435 | amdgpu_irq_put(adev, ring->fence_drv.irq_src, |
436 | ring->fence_drv.irq_type); | |
4f839a24 | 437 | amd_sched_fini(&ring->sched); |
c2776afe | 438 | del_timer_sync(&ring->fence_drv.fallback_timer); |
c89377d1 CK |
439 | for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j) |
440 | fence_put(ring->fence_drv.fences[i]); | |
441 | kfree(ring->fence_drv.fences); | |
d38ceaf9 AD |
442 | ring->fence_drv.initialized = false; |
443 | } | |
c89377d1 CK |
444 | |
445 | if (atomic_dec_and_test(&amdgpu_fence_slab_ref)) | |
446 | kmem_cache_destroy(amdgpu_fence_slab); | |
d38ceaf9 AD |
447 | } |
448 | ||
5ceb54c6 AD |
449 | /** |
450 | * amdgpu_fence_driver_suspend - suspend the fence driver | |
451 | * for all possible rings. | |
452 | * | |
453 | * @adev: amdgpu device pointer | |
454 | * | |
455 | * Suspend the fence driver for all possible rings (all asics). | |
456 | */ | |
457 | void amdgpu_fence_driver_suspend(struct amdgpu_device *adev) | |
458 | { | |
459 | int i, r; | |
460 | ||
5ceb54c6 AD |
461 | for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
462 | struct amdgpu_ring *ring = adev->rings[i]; | |
463 | if (!ring || !ring->fence_drv.initialized) | |
464 | continue; | |
465 | ||
466 | /* wait for gpu to finish processing current batch */ | |
467 | r = amdgpu_fence_wait_empty(ring); | |
468 | if (r) { | |
469 | /* delay GPU reset to resume */ | |
470 | amdgpu_fence_driver_force_completion(adev); | |
471 | } | |
472 | ||
473 | /* disable the interrupt */ | |
474 | amdgpu_irq_put(adev, ring->fence_drv.irq_src, | |
475 | ring->fence_drv.irq_type); | |
476 | } | |
5ceb54c6 AD |
477 | } |
478 | ||
479 | /** | |
480 | * amdgpu_fence_driver_resume - resume the fence driver | |
481 | * for all possible rings. | |
482 | * | |
483 | * @adev: amdgpu device pointer | |
484 | * | |
485 | * Resume the fence driver for all possible rings (all asics). | |
486 | * Not all asics have all rings, so each asic will only | |
487 | * start the fence driver on the rings it has using | |
488 | * amdgpu_fence_driver_start_ring(). | |
489 | * Returns 0 for success. | |
490 | */ | |
491 | void amdgpu_fence_driver_resume(struct amdgpu_device *adev) | |
492 | { | |
493 | int i; | |
494 | ||
5ceb54c6 AD |
495 | for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
496 | struct amdgpu_ring *ring = adev->rings[i]; | |
497 | if (!ring || !ring->fence_drv.initialized) | |
498 | continue; | |
499 | ||
500 | /* enable the interrupt */ | |
501 | amdgpu_irq_get(adev, ring->fence_drv.irq_src, | |
502 | ring->fence_drv.irq_type); | |
503 | } | |
5ceb54c6 AD |
504 | } |
505 | ||
d38ceaf9 AD |
506 | /** |
507 | * amdgpu_fence_driver_force_completion - force all fence waiter to complete | |
508 | * | |
509 | * @adev: amdgpu device pointer | |
510 | * | |
511 | * In case of GPU reset failure make sure no process keep waiting on fence | |
512 | * that will never complete. | |
513 | */ | |
514 | void amdgpu_fence_driver_force_completion(struct amdgpu_device *adev) | |
515 | { | |
516 | int i; | |
517 | ||
518 | for (i = 0; i < AMDGPU_MAX_RINGS; i++) { | |
519 | struct amdgpu_ring *ring = adev->rings[i]; | |
520 | if (!ring || !ring->fence_drv.initialized) | |
521 | continue; | |
522 | ||
5907a0d8 | 523 | amdgpu_fence_write(ring, ring->fence_drv.sync_seq); |
d38ceaf9 AD |
524 | } |
525 | } | |
526 | ||
a95e2642 CK |
527 | /* |
528 | * Common fence implementation | |
529 | */ | |
530 | ||
531 | static const char *amdgpu_fence_get_driver_name(struct fence *fence) | |
532 | { | |
533 | return "amdgpu"; | |
534 | } | |
535 | ||
536 | static const char *amdgpu_fence_get_timeline_name(struct fence *f) | |
537 | { | |
538 | struct amdgpu_fence *fence = to_amdgpu_fence(f); | |
539 | return (const char *)fence->ring->name; | |
540 | } | |
541 | ||
a95e2642 CK |
542 | /** |
543 | * amdgpu_fence_enable_signaling - enable signalling on fence | |
544 | * @fence: fence | |
545 | * | |
546 | * This function is called with fence_queue lock held, and adds a callback | |
547 | * to fence_queue that checks if this fence is signaled, and if so it | |
548 | * signals the fence and removes itself. | |
549 | */ | |
550 | static bool amdgpu_fence_enable_signaling(struct fence *f) | |
551 | { | |
552 | struct amdgpu_fence *fence = to_amdgpu_fence(f); | |
553 | struct amdgpu_ring *ring = fence->ring; | |
554 | ||
c2776afe CK |
555 | if (!timer_pending(&ring->fence_drv.fallback_timer)) |
556 | amdgpu_fence_schedule_fallback(ring); | |
4a7d74f1 | 557 | |
a95e2642 | 558 | FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx); |
4a7d74f1 | 559 | |
a95e2642 CK |
560 | return true; |
561 | } | |
562 | ||
b4413535 CK |
563 | /** |
564 | * amdgpu_fence_free - free up the fence memory | |
565 | * | |
566 | * @rcu: RCU callback head | |
567 | * | |
568 | * Free up the fence memory after the RCU grace period. | |
569 | */ | |
570 | static void amdgpu_fence_free(struct rcu_head *rcu) | |
b49c84a5 | 571 | { |
b4413535 | 572 | struct fence *f = container_of(rcu, struct fence, rcu); |
b49c84a5 CZ |
573 | struct amdgpu_fence *fence = to_amdgpu_fence(f); |
574 | kmem_cache_free(amdgpu_fence_slab, fence); | |
575 | } | |
576 | ||
b4413535 CK |
577 | /** |
578 | * amdgpu_fence_release - callback that fence can be freed | |
579 | * | |
580 | * @fence: fence | |
581 | * | |
582 | * This function is called when the reference count becomes zero. | |
583 | * It just RCU schedules freeing up the fence. | |
584 | */ | |
585 | static void amdgpu_fence_release(struct fence *f) | |
586 | { | |
587 | call_rcu(&f->rcu, amdgpu_fence_free); | |
588 | } | |
589 | ||
22e5a2f4 | 590 | static const struct fence_ops amdgpu_fence_ops = { |
a95e2642 CK |
591 | .get_driver_name = amdgpu_fence_get_driver_name, |
592 | .get_timeline_name = amdgpu_fence_get_timeline_name, | |
593 | .enable_signaling = amdgpu_fence_enable_signaling, | |
a95e2642 | 594 | .wait = fence_default_wait, |
b49c84a5 | 595 | .release = amdgpu_fence_release, |
a95e2642 | 596 | }; |
d38ceaf9 AD |
597 | |
598 | /* | |
599 | * Fence debugfs | |
600 | */ | |
601 | #if defined(CONFIG_DEBUG_FS) | |
602 | static int amdgpu_debugfs_fence_info(struct seq_file *m, void *data) | |
603 | { | |
604 | struct drm_info_node *node = (struct drm_info_node *)m->private; | |
605 | struct drm_device *dev = node->minor->dev; | |
606 | struct amdgpu_device *adev = dev->dev_private; | |
5907a0d8 | 607 | int i; |
d38ceaf9 AD |
608 | |
609 | for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { | |
610 | struct amdgpu_ring *ring = adev->rings[i]; | |
611 | if (!ring || !ring->fence_drv.initialized) | |
612 | continue; | |
613 | ||
614 | amdgpu_fence_process(ring); | |
615 | ||
344c19f9 | 616 | seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name); |
742c085f CK |
617 | seq_printf(m, "Last signaled fence 0x%08x\n", |
618 | atomic_read(&ring->fence_drv.last_seq)); | |
619 | seq_printf(m, "Last emitted 0x%08x\n", | |
5907a0d8 | 620 | ring->fence_drv.sync_seq); |
d38ceaf9 AD |
621 | } |
622 | return 0; | |
623 | } | |
624 | ||
18db89b4 AD |
625 | /** |
626 | * amdgpu_debugfs_gpu_reset - manually trigger a gpu reset | |
627 | * | |
628 | * Manually trigger a gpu reset at the next fence wait. | |
629 | */ | |
630 | static int amdgpu_debugfs_gpu_reset(struct seq_file *m, void *data) | |
631 | { | |
632 | struct drm_info_node *node = (struct drm_info_node *) m->private; | |
633 | struct drm_device *dev = node->minor->dev; | |
634 | struct amdgpu_device *adev = dev->dev_private; | |
635 | ||
636 | seq_printf(m, "gpu reset\n"); | |
637 | amdgpu_gpu_reset(adev); | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
d38ceaf9 AD |
642 | static struct drm_info_list amdgpu_debugfs_fence_list[] = { |
643 | {"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL}, | |
18db89b4 | 644 | {"amdgpu_gpu_reset", &amdgpu_debugfs_gpu_reset, 0, NULL} |
d38ceaf9 AD |
645 | }; |
646 | #endif | |
647 | ||
648 | int amdgpu_debugfs_fence_init(struct amdgpu_device *adev) | |
649 | { | |
650 | #if defined(CONFIG_DEBUG_FS) | |
18db89b4 | 651 | return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list, 2); |
d38ceaf9 AD |
652 | #else |
653 | return 0; | |
654 | #endif | |
655 | } | |
656 |