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771fe6b9 JG |
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> | |
60063497 | 32 | #include <linux/atomic.h> |
771fe6b9 JG |
33 | #include <linux/wait.h> |
34 | #include <linux/list.h> | |
35 | #include <linux/kref.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
771fe6b9 | 37 | #include "drmP.h" |
771fe6b9 JG |
38 | #include "radeon_reg.h" |
39 | #include "radeon.h" | |
99ee7fac | 40 | #include "radeon_trace.h" |
771fe6b9 | 41 | |
d66b7ec2 AD |
42 | /* |
43 | * Fences | |
44 | * Fences mark an event in the GPUs pipeline and are used | |
45 | * for GPU/CPU synchronization. When the fence is written, | |
46 | * it is expected that all buffers associated with that fence | |
47 | * are no longer in use by the associated ring on the GPU and | |
48 | * that the the relevant GPU caches have been flushed. Whether | |
49 | * we use a scratch register or memory location depends on the asic | |
50 | * and whether writeback is enabled. | |
51 | */ | |
52 | ||
53 | /** | |
54 | * radeon_fence_write - write a fence value | |
55 | * | |
56 | * @rdev: radeon_device pointer | |
57 | * @seq: sequence number to write | |
58 | * @ring: ring index the fence is associated with | |
59 | * | |
60 | * Writes a fence value to memory or a scratch register (all asics). | |
61 | */ | |
7465280c | 62 | static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring) |
b81157d0 | 63 | { |
bf66625e CK |
64 | struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; |
65 | if (likely(rdev->wb.enabled || !drv->scratch_reg)) { | |
66 | *drv->cpu_addr = cpu_to_le32(seq); | |
30eb77f4 | 67 | } else { |
bf66625e | 68 | WREG32(drv->scratch_reg, seq); |
30eb77f4 | 69 | } |
b81157d0 AD |
70 | } |
71 | ||
d66b7ec2 AD |
72 | /** |
73 | * radeon_fence_read - read a fence value | |
74 | * | |
75 | * @rdev: radeon_device pointer | |
76 | * @ring: ring index the fence is associated with | |
77 | * | |
78 | * Reads a fence value from memory or a scratch register (all asics). | |
79 | * Returns the value of the fence read from memory or register. | |
80 | */ | |
7465280c | 81 | static u32 radeon_fence_read(struct radeon_device *rdev, int ring) |
b81157d0 | 82 | { |
bf66625e | 83 | struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; |
7465280c | 84 | u32 seq = 0; |
b81157d0 | 85 | |
bf66625e CK |
86 | if (likely(rdev->wb.enabled || !drv->scratch_reg)) { |
87 | seq = le32_to_cpu(*drv->cpu_addr); | |
30eb77f4 | 88 | } else { |
bf66625e | 89 | seq = RREG32(drv->scratch_reg); |
30eb77f4 | 90 | } |
b81157d0 AD |
91 | return seq; |
92 | } | |
93 | ||
d66b7ec2 AD |
94 | /** |
95 | * radeon_fence_emit - emit a fence on the requested ring | |
96 | * | |
97 | * @rdev: radeon_device pointer | |
98 | * @fence: radeon fence object | |
99 | * @ring: ring index the fence is associated with | |
100 | * | |
101 | * Emits a fence command on the requested ring (all asics). | |
102 | * Returns 0 on success, -ENOMEM on failure. | |
103 | */ | |
876dc9f3 CK |
104 | int radeon_fence_emit(struct radeon_device *rdev, |
105 | struct radeon_fence **fence, | |
106 | int ring) | |
771fe6b9 | 107 | { |
3b7a2b24 | 108 | /* we are protected by the ring emission mutex */ |
876dc9f3 CK |
109 | *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL); |
110 | if ((*fence) == NULL) { | |
111 | return -ENOMEM; | |
771fe6b9 | 112 | } |
876dc9f3 CK |
113 | kref_init(&((*fence)->kref)); |
114 | (*fence)->rdev = rdev; | |
68e250b7 | 115 | (*fence)->seq = ++rdev->fence_drv[ring].sync_seq[ring]; |
876dc9f3 CK |
116 | (*fence)->ring = ring; |
117 | radeon_fence_ring_emit(rdev, ring, *fence); | |
118 | trace_radeon_fence_emit(rdev->ddev, (*fence)->seq); | |
771fe6b9 JG |
119 | return 0; |
120 | } | |
121 | ||
d66b7ec2 AD |
122 | /** |
123 | * radeon_fence_process - process a fence | |
124 | * | |
125 | * @rdev: radeon_device pointer | |
126 | * @ring: ring index the fence is associated with | |
127 | * | |
128 | * Checks the current fence value and wakes the fence queue | |
129 | * if the sequence number has increased (all asics). | |
130 | */ | |
3b7a2b24 | 131 | void radeon_fence_process(struct radeon_device *rdev, int ring) |
771fe6b9 | 132 | { |
f492c171 | 133 | uint64_t seq, last_seq, last_emitted; |
bb635567 | 134 | unsigned count_loop = 0; |
771fe6b9 JG |
135 | bool wake = false; |
136 | ||
bb635567 JG |
137 | /* Note there is a scenario here for an infinite loop but it's |
138 | * very unlikely to happen. For it to happen, the current polling | |
139 | * process need to be interrupted by another process and another | |
140 | * process needs to update the last_seq btw the atomic read and | |
141 | * xchg of the current process. | |
142 | * | |
143 | * More over for this to go in infinite loop there need to be | |
144 | * continuously new fence signaled ie radeon_fence_read needs | |
145 | * to return a different value each time for both the currently | |
146 | * polling process and the other process that xchg the last_seq | |
147 | * btw atomic read and xchg of the current process. And the | |
148 | * value the other process set as last seq must be higher than | |
149 | * the seq value we just read. Which means that current process | |
150 | * need to be interrupted after radeon_fence_read and before | |
151 | * atomic xchg. | |
152 | * | |
153 | * To be even more safe we count the number of time we loop and | |
154 | * we bail after 10 loop just accepting the fact that we might | |
155 | * have temporarly set the last_seq not to the true real last | |
156 | * seq but to an older one. | |
157 | */ | |
158 | last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq); | |
159 | do { | |
f492c171 | 160 | last_emitted = rdev->fence_drv[ring].sync_seq[ring]; |
bb635567 JG |
161 | seq = radeon_fence_read(rdev, ring); |
162 | seq |= last_seq & 0xffffffff00000000LL; | |
163 | if (seq < last_seq) { | |
f492c171 CK |
164 | seq &= 0xffffffff; |
165 | seq |= last_emitted & 0xffffffff00000000LL; | |
bb635567 | 166 | } |
36abacae | 167 | |
f492c171 | 168 | if (seq <= last_seq || seq > last_emitted) { |
3b7a2b24 | 169 | break; |
bb635567 JG |
170 | } |
171 | /* If we loop over we don't want to return without | |
172 | * checking if a fence is signaled as it means that the | |
173 | * seq we just read is different from the previous on. | |
174 | */ | |
175 | wake = true; | |
3b7a2b24 | 176 | last_seq = seq; |
bb635567 JG |
177 | if ((count_loop++) > 10) { |
178 | /* We looped over too many time leave with the | |
179 | * fact that we might have set an older fence | |
180 | * seq then the current real last seq as signaled | |
181 | * by the hw. | |
182 | */ | |
183 | break; | |
184 | } | |
bb635567 JG |
185 | } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq); |
186 | ||
3b7a2b24 JG |
187 | if (wake) { |
188 | rdev->fence_drv[ring].last_activity = jiffies; | |
0085c950 | 189 | wake_up_all(&rdev->fence_queue); |
771fe6b9 | 190 | } |
771fe6b9 JG |
191 | } |
192 | ||
d66b7ec2 AD |
193 | /** |
194 | * radeon_fence_destroy - destroy a fence | |
195 | * | |
196 | * @kref: fence kref | |
197 | * | |
198 | * Frees the fence object (all asics). | |
199 | */ | |
771fe6b9 JG |
200 | static void radeon_fence_destroy(struct kref *kref) |
201 | { | |
3b7a2b24 | 202 | struct radeon_fence *fence; |
771fe6b9 JG |
203 | |
204 | fence = container_of(kref, struct radeon_fence, kref); | |
771fe6b9 JG |
205 | kfree(fence); |
206 | } | |
207 | ||
d66b7ec2 AD |
208 | /** |
209 | * radeon_fence_seq_signaled - check if a fence sequeuce number has signaled | |
210 | * | |
211 | * @rdev: radeon device pointer | |
212 | * @seq: sequence number | |
213 | * @ring: ring index the fence is associated with | |
214 | * | |
215 | * Check if the last singled fence sequnce number is >= the requested | |
216 | * sequence number (all asics). | |
217 | * Returns true if the fence has signaled (current fence value | |
218 | * is >= requested value) or false if it has not (current fence | |
219 | * value is < the requested value. Helper function for | |
220 | * radeon_fence_signaled(). | |
221 | */ | |
3b7a2b24 JG |
222 | static bool radeon_fence_seq_signaled(struct radeon_device *rdev, |
223 | u64 seq, unsigned ring) | |
771fe6b9 | 224 | { |
3b7a2b24 JG |
225 | if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { |
226 | return true; | |
227 | } | |
228 | /* poll new last sequence at least once */ | |
229 | radeon_fence_process(rdev, ring); | |
230 | if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { | |
771fe6b9 | 231 | return true; |
3b7a2b24 JG |
232 | } |
233 | return false; | |
234 | } | |
3655d54a | 235 | |
d66b7ec2 AD |
236 | /** |
237 | * radeon_fence_signaled - check if a fence has signaled | |
238 | * | |
239 | * @fence: radeon fence object | |
240 | * | |
241 | * Check if the requested fence has signaled (all asics). | |
242 | * Returns true if the fence has signaled or false if it has not. | |
243 | */ | |
3b7a2b24 JG |
244 | bool radeon_fence_signaled(struct radeon_fence *fence) |
245 | { | |
246 | if (!fence) { | |
247 | return true; | |
771fe6b9 | 248 | } |
3b7a2b24 JG |
249 | if (fence->seq == RADEON_FENCE_SIGNALED_SEQ) { |
250 | return true; | |
771fe6b9 | 251 | } |
3b7a2b24 JG |
252 | if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) { |
253 | fence->seq = RADEON_FENCE_SIGNALED_SEQ; | |
254 | return true; | |
255 | } | |
256 | return false; | |
771fe6b9 JG |
257 | } |
258 | ||
d66b7ec2 AD |
259 | /** |
260 | * radeon_fence_wait_seq - wait for a specific sequence number | |
261 | * | |
262 | * @rdev: radeon device pointer | |
263 | * @target_seq: sequence number we want to wait for | |
264 | * @ring: ring index the fence is associated with | |
265 | * @intr: use interruptable sleep | |
266 | * @lock_ring: whether the ring should be locked or not | |
267 | * | |
268 | * Wait for the requested sequence number to be written (all asics). | |
269 | * @intr selects whether to use interruptable (true) or non-interruptable | |
270 | * (false) sleep when waiting for the sequence number. Helper function | |
271 | * for radeon_fence_wait(), et al. | |
272 | * Returns 0 if the sequence number has passed, error for all other cases. | |
273 | * -EDEADLK is returned when a GPU lockup has been detected and the ring is | |
274 | * marked as not ready so no further jobs get scheduled until a successful | |
275 | * reset. | |
276 | */ | |
3b7a2b24 | 277 | static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq, |
8a47cc9e | 278 | unsigned ring, bool intr, bool lock_ring) |
771fe6b9 | 279 | { |
3b7a2b24 | 280 | unsigned long timeout, last_activity; |
bb635567 | 281 | uint64_t seq; |
3b7a2b24 | 282 | unsigned i; |
36abacae | 283 | bool signaled; |
3b7a2b24 | 284 | int r; |
771fe6b9 | 285 | |
3b7a2b24 JG |
286 | while (target_seq > atomic64_read(&rdev->fence_drv[ring].last_seq)) { |
287 | if (!rdev->ring[ring].ready) { | |
288 | return -EBUSY; | |
289 | } | |
36abacae | 290 | |
36abacae | 291 | timeout = jiffies - RADEON_FENCE_JIFFIES_TIMEOUT; |
3b7a2b24 | 292 | if (time_after(rdev->fence_drv[ring].last_activity, timeout)) { |
36abacae | 293 | /* the normal case, timeout is somewhere before last_activity */ |
3b7a2b24 | 294 | timeout = rdev->fence_drv[ring].last_activity - timeout; |
36abacae CK |
295 | } else { |
296 | /* either jiffies wrapped around, or no fence was signaled in the last 500ms | |
3b7a2b24 JG |
297 | * anyway we will just wait for the minimum amount and then check for a lockup |
298 | */ | |
36abacae CK |
299 | timeout = 1; |
300 | } | |
3b7a2b24 | 301 | seq = atomic64_read(&rdev->fence_drv[ring].last_seq); |
bb635567 | 302 | /* Save current last activity valuee, used to check for GPU lockups */ |
3b7a2b24 | 303 | last_activity = rdev->fence_drv[ring].last_activity; |
36abacae CK |
304 | |
305 | trace_radeon_fence_wait_begin(rdev->ddev, seq); | |
3b7a2b24 | 306 | radeon_irq_kms_sw_irq_get(rdev, ring); |
36abacae | 307 | if (intr) { |
0085c950 | 308 | r = wait_event_interruptible_timeout(rdev->fence_queue, |
3b7a2b24 JG |
309 | (signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)), |
310 | timeout); | |
311 | } else { | |
0085c950 | 312 | r = wait_event_timeout(rdev->fence_queue, |
3b7a2b24 JG |
313 | (signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)), |
314 | timeout); | |
36abacae | 315 | } |
3b7a2b24 | 316 | radeon_irq_kms_sw_irq_put(rdev, ring); |
90aca4d2 | 317 | if (unlikely(r < 0)) { |
5cc6fbab | 318 | return r; |
90aca4d2 | 319 | } |
36abacae | 320 | trace_radeon_fence_wait_end(rdev->ddev, seq); |
25a9e352 | 321 | |
36abacae CK |
322 | if (unlikely(!signaled)) { |
323 | /* we were interrupted for some reason and fence | |
324 | * isn't signaled yet, resume waiting */ | |
325 | if (r) { | |
326 | continue; | |
327 | } | |
25a9e352 | 328 | |
3b7a2b24 JG |
329 | /* check if sequence value has changed since last_activity */ |
330 | if (seq != atomic64_read(&rdev->fence_drv[ring].last_seq)) { | |
331 | continue; | |
332 | } | |
8a47cc9e CK |
333 | |
334 | if (lock_ring) { | |
335 | mutex_lock(&rdev->ring_lock); | |
336 | } | |
337 | ||
bb635567 | 338 | /* test if somebody else has already decided that this is a lockup */ |
3b7a2b24 | 339 | if (last_activity != rdev->fence_drv[ring].last_activity) { |
8a47cc9e CK |
340 | if (lock_ring) { |
341 | mutex_unlock(&rdev->ring_lock); | |
342 | } | |
36abacae CK |
343 | continue; |
344 | } | |
345 | ||
3b7a2b24 | 346 | if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) { |
36abacae | 347 | /* good news we believe it's a lockup */ |
bb635567 | 348 | dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx last fence id 0x%016llx)\n", |
3b7a2b24 JG |
349 | target_seq, seq); |
350 | ||
351 | /* change last activity so nobody else think there is a lockup */ | |
352 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
353 | rdev->fence_drv[i].last_activity = jiffies; | |
354 | } | |
bb635567 | 355 | |
36abacae | 356 | /* mark the ring as not ready any more */ |
3b7a2b24 | 357 | rdev->ring[ring].ready = false; |
8a47cc9e CK |
358 | if (lock_ring) { |
359 | mutex_unlock(&rdev->ring_lock); | |
360 | } | |
6c6f4783 | 361 | return -EDEADLK; |
36abacae | 362 | } |
8a47cc9e CK |
363 | |
364 | if (lock_ring) { | |
365 | mutex_unlock(&rdev->ring_lock); | |
366 | } | |
771fe6b9 | 367 | } |
771fe6b9 | 368 | } |
771fe6b9 JG |
369 | return 0; |
370 | } | |
371 | ||
d66b7ec2 AD |
372 | /** |
373 | * radeon_fence_wait - wait for a fence to signal | |
374 | * | |
375 | * @fence: radeon fence object | |
376 | * @intr: use interruptable sleep | |
377 | * | |
378 | * Wait for the requested fence to signal (all asics). | |
379 | * @intr selects whether to use interruptable (true) or non-interruptable | |
380 | * (false) sleep when waiting for the fence. | |
381 | * Returns 0 if the fence has passed, error for all other cases. | |
382 | */ | |
3b7a2b24 | 383 | int radeon_fence_wait(struct radeon_fence *fence, bool intr) |
771fe6b9 | 384 | { |
771fe6b9 JG |
385 | int r; |
386 | ||
3b7a2b24 JG |
387 | if (fence == NULL) { |
388 | WARN(1, "Querying an invalid fence : %p !\n", fence); | |
389 | return -EINVAL; | |
25a9e352 | 390 | } |
3b7a2b24 | 391 | |
8a47cc9e CK |
392 | r = radeon_fence_wait_seq(fence->rdev, fence->seq, |
393 | fence->ring, intr, true); | |
3b7a2b24 JG |
394 | if (r) { |
395 | return r; | |
771fe6b9 | 396 | } |
3b7a2b24 JG |
397 | fence->seq = RADEON_FENCE_SIGNALED_SEQ; |
398 | return 0; | |
771fe6b9 JG |
399 | } |
400 | ||
0085c950 JG |
401 | bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq) |
402 | { | |
403 | unsigned i; | |
404 | ||
405 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
406 | if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i)) { | |
407 | return true; | |
408 | } | |
409 | } | |
410 | return false; | |
411 | } | |
412 | ||
d66b7ec2 AD |
413 | /** |
414 | * radeon_fence_wait_any_seq - wait for a sequence number on any ring | |
415 | * | |
416 | * @rdev: radeon device pointer | |
417 | * @target_seq: sequence number(s) we want to wait for | |
418 | * @intr: use interruptable sleep | |
419 | * | |
420 | * Wait for the requested sequence number(s) to be written by any ring | |
421 | * (all asics). Sequnce number array is indexed by ring id. | |
422 | * @intr selects whether to use interruptable (true) or non-interruptable | |
423 | * (false) sleep when waiting for the sequence number. Helper function | |
424 | * for radeon_fence_wait_any(), et al. | |
425 | * Returns 0 if the sequence number has passed, error for all other cases. | |
426 | */ | |
0085c950 JG |
427 | static int radeon_fence_wait_any_seq(struct radeon_device *rdev, |
428 | u64 *target_seq, bool intr) | |
429 | { | |
430 | unsigned long timeout, last_activity, tmp; | |
431 | unsigned i, ring = RADEON_NUM_RINGS; | |
432 | bool signaled; | |
433 | int r; | |
434 | ||
435 | for (i = 0, last_activity = 0; i < RADEON_NUM_RINGS; ++i) { | |
436 | if (!target_seq[i]) { | |
437 | continue; | |
438 | } | |
439 | ||
440 | /* use the most recent one as indicator */ | |
441 | if (time_after(rdev->fence_drv[i].last_activity, last_activity)) { | |
442 | last_activity = rdev->fence_drv[i].last_activity; | |
443 | } | |
444 | ||
445 | /* For lockup detection just pick the lowest ring we are | |
446 | * actively waiting for | |
447 | */ | |
448 | if (i < ring) { | |
449 | ring = i; | |
450 | } | |
451 | } | |
452 | ||
453 | /* nothing to wait for ? */ | |
454 | if (ring == RADEON_NUM_RINGS) { | |
246fa345 | 455 | return -ENOENT; |
0085c950 JG |
456 | } |
457 | ||
458 | while (!radeon_fence_any_seq_signaled(rdev, target_seq)) { | |
459 | timeout = jiffies - RADEON_FENCE_JIFFIES_TIMEOUT; | |
460 | if (time_after(last_activity, timeout)) { | |
461 | /* the normal case, timeout is somewhere before last_activity */ | |
462 | timeout = last_activity - timeout; | |
463 | } else { | |
464 | /* either jiffies wrapped around, or no fence was signaled in the last 500ms | |
465 | * anyway we will just wait for the minimum amount and then check for a lockup | |
466 | */ | |
467 | timeout = 1; | |
468 | } | |
469 | ||
470 | trace_radeon_fence_wait_begin(rdev->ddev, target_seq[ring]); | |
471 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
472 | if (target_seq[i]) { | |
473 | radeon_irq_kms_sw_irq_get(rdev, i); | |
474 | } | |
475 | } | |
476 | if (intr) { | |
477 | r = wait_event_interruptible_timeout(rdev->fence_queue, | |
478 | (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)), | |
479 | timeout); | |
480 | } else { | |
481 | r = wait_event_timeout(rdev->fence_queue, | |
482 | (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)), | |
483 | timeout); | |
484 | } | |
485 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
486 | if (target_seq[i]) { | |
487 | radeon_irq_kms_sw_irq_put(rdev, i); | |
488 | } | |
489 | } | |
490 | if (unlikely(r < 0)) { | |
491 | return r; | |
492 | } | |
493 | trace_radeon_fence_wait_end(rdev->ddev, target_seq[ring]); | |
494 | ||
495 | if (unlikely(!signaled)) { | |
496 | /* we were interrupted for some reason and fence | |
497 | * isn't signaled yet, resume waiting */ | |
498 | if (r) { | |
499 | continue; | |
500 | } | |
501 | ||
502 | mutex_lock(&rdev->ring_lock); | |
503 | for (i = 0, tmp = 0; i < RADEON_NUM_RINGS; ++i) { | |
504 | if (time_after(rdev->fence_drv[i].last_activity, tmp)) { | |
505 | tmp = rdev->fence_drv[i].last_activity; | |
506 | } | |
507 | } | |
508 | /* test if somebody else has already decided that this is a lockup */ | |
509 | if (last_activity != tmp) { | |
510 | last_activity = tmp; | |
511 | mutex_unlock(&rdev->ring_lock); | |
512 | continue; | |
513 | } | |
514 | ||
515 | if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) { | |
516 | /* good news we believe it's a lockup */ | |
517 | dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx)\n", | |
518 | target_seq[ring]); | |
519 | ||
520 | /* change last activity so nobody else think there is a lockup */ | |
521 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
522 | rdev->fence_drv[i].last_activity = jiffies; | |
523 | } | |
524 | ||
525 | /* mark the ring as not ready any more */ | |
526 | rdev->ring[ring].ready = false; | |
527 | mutex_unlock(&rdev->ring_lock); | |
528 | return -EDEADLK; | |
529 | } | |
530 | mutex_unlock(&rdev->ring_lock); | |
531 | } | |
532 | } | |
533 | return 0; | |
534 | } | |
535 | ||
d66b7ec2 AD |
536 | /** |
537 | * radeon_fence_wait_any - wait for a fence to signal on any ring | |
538 | * | |
539 | * @rdev: radeon device pointer | |
540 | * @fences: radeon fence object(s) | |
541 | * @intr: use interruptable sleep | |
542 | * | |
543 | * Wait for any requested fence to signal (all asics). Fence | |
544 | * array is indexed by ring id. @intr selects whether to use | |
545 | * interruptable (true) or non-interruptable (false) sleep when | |
546 | * waiting for the fences. Used by the suballocator. | |
547 | * Returns 0 if any fence has passed, error for all other cases. | |
548 | */ | |
0085c950 JG |
549 | int radeon_fence_wait_any(struct radeon_device *rdev, |
550 | struct radeon_fence **fences, | |
551 | bool intr) | |
552 | { | |
553 | uint64_t seq[RADEON_NUM_RINGS]; | |
554 | unsigned i; | |
555 | int r; | |
556 | ||
557 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
558 | seq[i] = 0; | |
559 | ||
560 | if (!fences[i]) { | |
561 | continue; | |
562 | } | |
563 | ||
564 | if (fences[i]->seq == RADEON_FENCE_SIGNALED_SEQ) { | |
565 | /* something was allready signaled */ | |
566 | return 0; | |
567 | } | |
568 | ||
876dc9f3 | 569 | seq[i] = fences[i]->seq; |
0085c950 JG |
570 | } |
571 | ||
572 | r = radeon_fence_wait_any_seq(rdev, seq, intr); | |
573 | if (r) { | |
574 | return r; | |
575 | } | |
576 | return 0; | |
577 | } | |
578 | ||
d66b7ec2 AD |
579 | /** |
580 | * radeon_fence_wait_next_locked - wait for the next fence to signal | |
581 | * | |
582 | * @rdev: radeon device pointer | |
583 | * @ring: ring index the fence is associated with | |
584 | * | |
585 | * Wait for the next fence on the requested ring to signal (all asics). | |
586 | * Returns 0 if the next fence has passed, error for all other cases. | |
587 | * Caller must hold ring lock. | |
588 | */ | |
8a47cc9e | 589 | int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring) |
771fe6b9 | 590 | { |
3b7a2b24 | 591 | uint64_t seq; |
771fe6b9 | 592 | |
3b7a2b24 | 593 | seq = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL; |
68e250b7 | 594 | if (seq >= rdev->fence_drv[ring].sync_seq[ring]) { |
8a47cc9e CK |
595 | /* nothing to wait for, last_seq is |
596 | already the last emited fence */ | |
597 | return -ENOENT; | |
771fe6b9 | 598 | } |
8a47cc9e | 599 | return radeon_fence_wait_seq(rdev, seq, ring, false, false); |
3b7a2b24 JG |
600 | } |
601 | ||
d66b7ec2 AD |
602 | /** |
603 | * radeon_fence_wait_empty_locked - wait for all fences to signal | |
604 | * | |
605 | * @rdev: radeon device pointer | |
606 | * @ring: ring index the fence is associated with | |
607 | * | |
608 | * Wait for all fences on the requested ring to signal (all asics). | |
609 | * Returns 0 if the fences have passed, error for all other cases. | |
610 | * Caller must hold ring lock. | |
611 | */ | |
7ecc45e3 | 612 | void radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring) |
3b7a2b24 | 613 | { |
7ecc45e3 CK |
614 | uint64_t seq = rdev->fence_drv[ring].sync_seq[ring]; |
615 | ||
616 | while(1) { | |
617 | int r; | |
618 | r = radeon_fence_wait_seq(rdev, seq, ring, false, false); | |
619 | if (r == -EDEADLK) { | |
620 | mutex_unlock(&rdev->ring_lock); | |
621 | r = radeon_gpu_reset(rdev); | |
622 | mutex_lock(&rdev->ring_lock); | |
623 | if (!r) | |
624 | continue; | |
625 | } | |
626 | if (r) { | |
627 | dev_err(rdev->dev, "error waiting for ring to become" | |
628 | " idle (%d)\n", r); | |
629 | } | |
630 | return; | |
631 | } | |
771fe6b9 JG |
632 | } |
633 | ||
d66b7ec2 AD |
634 | /** |
635 | * radeon_fence_ref - take a ref on a fence | |
636 | * | |
637 | * @fence: radeon fence object | |
638 | * | |
639 | * Take a reference on a fence (all asics). | |
640 | * Returns the fence. | |
641 | */ | |
771fe6b9 JG |
642 | struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence) |
643 | { | |
644 | kref_get(&fence->kref); | |
645 | return fence; | |
646 | } | |
647 | ||
d66b7ec2 AD |
648 | /** |
649 | * radeon_fence_unref - remove a ref on a fence | |
650 | * | |
651 | * @fence: radeon fence object | |
652 | * | |
653 | * Remove a reference on a fence (all asics). | |
654 | */ | |
771fe6b9 JG |
655 | void radeon_fence_unref(struct radeon_fence **fence) |
656 | { | |
657 | struct radeon_fence *tmp = *fence; | |
658 | ||
659 | *fence = NULL; | |
660 | if (tmp) { | |
cdb650a4 | 661 | kref_put(&tmp->kref, radeon_fence_destroy); |
771fe6b9 JG |
662 | } |
663 | } | |
664 | ||
d66b7ec2 AD |
665 | /** |
666 | * radeon_fence_count_emitted - get the count of emitted fences | |
667 | * | |
668 | * @rdev: radeon device pointer | |
669 | * @ring: ring index the fence is associated with | |
670 | * | |
671 | * Get the number of fences emitted on the requested ring (all asics). | |
672 | * Returns the number of emitted fences on the ring. Used by the | |
673 | * dynpm code to ring track activity. | |
674 | */ | |
3b7a2b24 | 675 | unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring) |
771fe6b9 | 676 | { |
3b7a2b24 | 677 | uint64_t emitted; |
771fe6b9 | 678 | |
3b7a2b24 JG |
679 | /* We are not protected by ring lock when reading the last sequence |
680 | * but it's ok to report slightly wrong fence count here. | |
681 | */ | |
0085c950 | 682 | radeon_fence_process(rdev, ring); |
68e250b7 CK |
683 | emitted = rdev->fence_drv[ring].sync_seq[ring] |
684 | - atomic64_read(&rdev->fence_drv[ring].last_seq); | |
3b7a2b24 JG |
685 | /* to avoid 32bits warp around */ |
686 | if (emitted > 0x10000000) { | |
687 | emitted = 0x10000000; | |
47492a23 | 688 | } |
3b7a2b24 | 689 | return (unsigned)emitted; |
47492a23 CK |
690 | } |
691 | ||
d66b7ec2 AD |
692 | /** |
693 | * radeon_fence_need_sync - do we need a semaphore | |
694 | * | |
695 | * @fence: radeon fence object | |
696 | * @dst_ring: which ring to check against | |
697 | * | |
698 | * Check if the fence needs to be synced against another ring | |
699 | * (all asics). If so, we need to emit a semaphore. | |
700 | * Returns true if we need to sync with another ring, false if | |
701 | * not. | |
702 | */ | |
68e250b7 CK |
703 | bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring) |
704 | { | |
705 | struct radeon_fence_driver *fdrv; | |
706 | ||
707 | if (!fence) { | |
708 | return false; | |
709 | } | |
710 | ||
711 | if (fence->ring == dst_ring) { | |
712 | return false; | |
713 | } | |
714 | ||
715 | /* we are protected by the ring mutex */ | |
716 | fdrv = &fence->rdev->fence_drv[dst_ring]; | |
717 | if (fence->seq <= fdrv->sync_seq[fence->ring]) { | |
718 | return false; | |
719 | } | |
720 | ||
721 | return true; | |
722 | } | |
723 | ||
d66b7ec2 AD |
724 | /** |
725 | * radeon_fence_note_sync - record the sync point | |
726 | * | |
727 | * @fence: radeon fence object | |
728 | * @dst_ring: which ring to check against | |
729 | * | |
730 | * Note the sequence number at which point the fence will | |
731 | * be synced with the requested ring (all asics). | |
732 | */ | |
68e250b7 CK |
733 | void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring) |
734 | { | |
735 | struct radeon_fence_driver *dst, *src; | |
736 | unsigned i; | |
737 | ||
738 | if (!fence) { | |
739 | return; | |
740 | } | |
741 | ||
742 | if (fence->ring == dst_ring) { | |
743 | return; | |
744 | } | |
745 | ||
746 | /* we are protected by the ring mutex */ | |
747 | src = &fence->rdev->fence_drv[fence->ring]; | |
748 | dst = &fence->rdev->fence_drv[dst_ring]; | |
749 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
750 | if (i == dst_ring) { | |
751 | continue; | |
752 | } | |
753 | dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]); | |
754 | } | |
755 | } | |
756 | ||
d66b7ec2 AD |
757 | /** |
758 | * radeon_fence_driver_start_ring - make the fence driver | |
759 | * ready for use on the requested ring. | |
760 | * | |
761 | * @rdev: radeon device pointer | |
762 | * @ring: ring index to start the fence driver on | |
763 | * | |
764 | * Make the fence driver ready for processing (all asics). | |
765 | * Not all asics have all rings, so each asic will only | |
766 | * start the fence driver on the rings it has. | |
767 | * Returns 0 for success, errors for failure. | |
768 | */ | |
30eb77f4 | 769 | int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring) |
771fe6b9 | 770 | { |
30eb77f4 JG |
771 | uint64_t index; |
772 | int r; | |
771fe6b9 | 773 | |
30eb77f4 JG |
774 | radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg); |
775 | if (rdev->wb.use_event) { | |
776 | rdev->fence_drv[ring].scratch_reg = 0; | |
777 | index = R600_WB_EVENT_OFFSET + ring * 4; | |
778 | } else { | |
7465280c AD |
779 | r = radeon_scratch_get(rdev, &rdev->fence_drv[ring].scratch_reg); |
780 | if (r) { | |
781 | dev_err(rdev->dev, "fence failed to get scratch register\n"); | |
7465280c AD |
782 | return r; |
783 | } | |
30eb77f4 JG |
784 | index = RADEON_WB_SCRATCH_OFFSET + |
785 | rdev->fence_drv[ring].scratch_reg - | |
786 | rdev->scratch.reg_base; | |
7465280c | 787 | } |
30eb77f4 JG |
788 | rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4]; |
789 | rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index; | |
31be6183 | 790 | radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring); |
30eb77f4 | 791 | rdev->fence_drv[ring].initialized = true; |
3b7a2b24 | 792 | dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n", |
30eb77f4 | 793 | ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr); |
30eb77f4 JG |
794 | return 0; |
795 | } | |
796 | ||
d66b7ec2 AD |
797 | /** |
798 | * radeon_fence_driver_init_ring - init the fence driver | |
799 | * for the requested ring. | |
800 | * | |
801 | * @rdev: radeon device pointer | |
802 | * @ring: ring index to start the fence driver on | |
803 | * | |
804 | * Init the fence driver for the requested ring (all asics). | |
805 | * Helper function for radeon_fence_driver_init(). | |
806 | */ | |
30eb77f4 JG |
807 | static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring) |
808 | { | |
68e250b7 CK |
809 | int i; |
810 | ||
30eb77f4 JG |
811 | rdev->fence_drv[ring].scratch_reg = -1; |
812 | rdev->fence_drv[ring].cpu_addr = NULL; | |
813 | rdev->fence_drv[ring].gpu_addr = 0; | |
68e250b7 CK |
814 | for (i = 0; i < RADEON_NUM_RINGS; ++i) |
815 | rdev->fence_drv[ring].sync_seq[i] = 0; | |
bb635567 | 816 | atomic64_set(&rdev->fence_drv[ring].last_seq, 0); |
3b7a2b24 | 817 | rdev->fence_drv[ring].last_activity = jiffies; |
30eb77f4 JG |
818 | rdev->fence_drv[ring].initialized = false; |
819 | } | |
820 | ||
d66b7ec2 AD |
821 | /** |
822 | * radeon_fence_driver_init - init the fence driver | |
823 | * for all possible rings. | |
824 | * | |
825 | * @rdev: radeon device pointer | |
826 | * | |
827 | * Init the fence driver for all possible rings (all asics). | |
828 | * Not all asics have all rings, so each asic will only | |
829 | * start the fence driver on the rings it has using | |
830 | * radeon_fence_driver_start_ring(). | |
831 | * Returns 0 for success. | |
832 | */ | |
30eb77f4 JG |
833 | int radeon_fence_driver_init(struct radeon_device *rdev) |
834 | { | |
30eb77f4 JG |
835 | int ring; |
836 | ||
0085c950 | 837 | init_waitqueue_head(&rdev->fence_queue); |
30eb77f4 JG |
838 | for (ring = 0; ring < RADEON_NUM_RINGS; ring++) { |
839 | radeon_fence_driver_init_ring(rdev, ring); | |
771fe6b9 | 840 | } |
771fe6b9 | 841 | if (radeon_debugfs_fence_init(rdev)) { |
0a0c7596 | 842 | dev_err(rdev->dev, "fence debugfs file creation failed\n"); |
771fe6b9 JG |
843 | } |
844 | return 0; | |
845 | } | |
846 | ||
d66b7ec2 AD |
847 | /** |
848 | * radeon_fence_driver_fini - tear down the fence driver | |
849 | * for all possible rings. | |
850 | * | |
851 | * @rdev: radeon device pointer | |
852 | * | |
853 | * Tear down the fence driver for all possible rings (all asics). | |
854 | */ | |
771fe6b9 JG |
855 | void radeon_fence_driver_fini(struct radeon_device *rdev) |
856 | { | |
7465280c AD |
857 | int ring; |
858 | ||
8a47cc9e | 859 | mutex_lock(&rdev->ring_lock); |
7465280c AD |
860 | for (ring = 0; ring < RADEON_NUM_RINGS; ring++) { |
861 | if (!rdev->fence_drv[ring].initialized) | |
862 | continue; | |
8a47cc9e | 863 | radeon_fence_wait_empty_locked(rdev, ring); |
0085c950 | 864 | wake_up_all(&rdev->fence_queue); |
7465280c | 865 | radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg); |
7465280c AD |
866 | rdev->fence_drv[ring].initialized = false; |
867 | } | |
8a47cc9e | 868 | mutex_unlock(&rdev->ring_lock); |
771fe6b9 JG |
869 | } |
870 | ||
871 | ||
872 | /* | |
873 | * Fence debugfs | |
874 | */ | |
875 | #if defined(CONFIG_DEBUG_FS) | |
876 | static int radeon_debugfs_fence_info(struct seq_file *m, void *data) | |
877 | { | |
878 | struct drm_info_node *node = (struct drm_info_node *)m->private; | |
879 | struct drm_device *dev = node->minor->dev; | |
880 | struct radeon_device *rdev = dev->dev_private; | |
68e250b7 | 881 | int i, j; |
7465280c AD |
882 | |
883 | for (i = 0; i < RADEON_NUM_RINGS; ++i) { | |
884 | if (!rdev->fence_drv[i].initialized) | |
885 | continue; | |
886 | ||
887 | seq_printf(m, "--- ring %d ---\n", i); | |
d3029b4e DA |
888 | seq_printf(m, "Last signaled fence 0x%016llx\n", |
889 | (unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq)); | |
68e250b7 CK |
890 | seq_printf(m, "Last emitted 0x%016llx\n", |
891 | rdev->fence_drv[i].sync_seq[i]); | |
892 | ||
893 | for (j = 0; j < RADEON_NUM_RINGS; ++j) { | |
894 | if (i != j && rdev->fence_drv[j].initialized) | |
895 | seq_printf(m, "Last sync to ring %d 0x%016llx\n", | |
896 | j, rdev->fence_drv[i].sync_seq[j]); | |
897 | } | |
771fe6b9 JG |
898 | } |
899 | return 0; | |
900 | } | |
901 | ||
902 | static struct drm_info_list radeon_debugfs_fence_list[] = { | |
903 | {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL}, | |
904 | }; | |
905 | #endif | |
906 | ||
907 | int radeon_debugfs_fence_init(struct radeon_device *rdev) | |
908 | { | |
909 | #if defined(CONFIG_DEBUG_FS) | |
910 | return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 1); | |
911 | #else | |
912 | return 0; | |
913 | #endif | |
914 | } |