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1/**************************************************************************
2 *
3 * Copyright (C) 2010 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29#include "vmwgfx_drv.h"
30
31struct vmw_fence {
32 struct list_head head;
33 uint32_t sequence;
34 struct timespec submitted;
35};
36
37void vmw_fence_queue_init(struct vmw_fence_queue *queue)
38{
39 INIT_LIST_HEAD(&queue->head);
40 queue->lag = ns_to_timespec(0);
41 getrawmonotonic(&queue->lag_time);
42 spin_lock_init(&queue->lock);
43}
44
45void vmw_fence_queue_takedown(struct vmw_fence_queue *queue)
46{
47 struct vmw_fence *fence, *next;
48
49 spin_lock(&queue->lock);
50 list_for_each_entry_safe(fence, next, &queue->head, head) {
51 kfree(fence);
52 }
53 spin_unlock(&queue->lock);
54}
55
56int vmw_fence_push(struct vmw_fence_queue *queue,
57 uint32_t sequence)
58{
59 struct vmw_fence *fence = kmalloc(sizeof(*fence), GFP_KERNEL);
60
61 if (unlikely(!fence))
62 return -ENOMEM;
63
64 fence->sequence = sequence;
65 getrawmonotonic(&fence->submitted);
66 spin_lock(&queue->lock);
67 list_add_tail(&fence->head, &queue->head);
68 spin_unlock(&queue->lock);
69
70 return 0;
71}
72
73int vmw_fence_pull(struct vmw_fence_queue *queue,
74 uint32_t signaled_sequence)
75{
76 struct vmw_fence *fence, *next;
77 struct timespec now;
78 bool updated = false;
79
80 spin_lock(&queue->lock);
81 getrawmonotonic(&now);
82
83 if (list_empty(&queue->head)) {
84 queue->lag = ns_to_timespec(0);
85 queue->lag_time = now;
86 updated = true;
87 goto out_unlock;
88 }
89
90 list_for_each_entry_safe(fence, next, &queue->head, head) {
91 if (signaled_sequence - fence->sequence > (1 << 30))
92 continue;
93
94 queue->lag = timespec_sub(now, fence->submitted);
95 queue->lag_time = now;
96 updated = true;
97 list_del(&fence->head);
98 kfree(fence);
99 }
100
101out_unlock:
102 spin_unlock(&queue->lock);
103
104 return (updated) ? 0 : -EBUSY;
105}
106
107static struct timespec vmw_timespec_add(struct timespec t1,
108 struct timespec t2)
109{
110 t1.tv_sec += t2.tv_sec;
111 t1.tv_nsec += t2.tv_nsec;
112 if (t1.tv_nsec >= 1000000000L) {
113 t1.tv_sec += 1;
114 t1.tv_nsec -= 1000000000L;
115 }
116
117 return t1;
118}
119
120static struct timespec vmw_fifo_lag(struct vmw_fence_queue *queue)
121{
122 struct timespec now;
123
124 spin_lock(&queue->lock);
125 getrawmonotonic(&now);
126 queue->lag = vmw_timespec_add(queue->lag,
127 timespec_sub(now, queue->lag_time));
128 queue->lag_time = now;
129 spin_unlock(&queue->lock);
130 return queue->lag;
131}
132
133
134static bool vmw_lag_lt(struct vmw_fence_queue *queue,
135 uint32_t us)
136{
137 struct timespec lag, cond;
138
139 cond = ns_to_timespec((s64) us * 1000);
140 lag = vmw_fifo_lag(queue);
141 return (timespec_compare(&lag, &cond) < 1);
142}
143
144int vmw_wait_lag(struct vmw_private *dev_priv,
145 struct vmw_fence_queue *queue, uint32_t us)
146{
147 struct vmw_fence *fence;
148 uint32_t sequence;
149 int ret;
150
151 while (!vmw_lag_lt(queue, us)) {
152 spin_lock(&queue->lock);
153 if (list_empty(&queue->head))
154 sequence = atomic_read(&dev_priv->fence_seq);
155 else {
156 fence = list_first_entry(&queue->head,
157 struct vmw_fence, head);
158 sequence = fence->sequence;
159 }
160 spin_unlock(&queue->lock);
161
162 ret = vmw_wait_fence(dev_priv, false, sequence, true,
163 3*HZ);
164
165 if (unlikely(ret != 0))
166 return ret;
167
168 (void) vmw_fence_pull(queue, sequence);
169 }
170 return 0;
171}
172
173
1/**************************************************************************
2 *
3 * Copyright © 2011-2014 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include <drm/drmP.h>
29#include "vmwgfx_drv.h"
30
31#define VMW_FENCE_WRAP (1 << 31)
32
33struct vmw_fence_manager {
34 int num_fence_objects;
35 struct vmw_private *dev_priv;
36 spinlock_t lock;
37 struct list_head fence_list;
38 struct work_struct work;
39 u32 user_fence_size;
40 u32 fence_size;
41 u32 event_fence_action_size;
42 bool fifo_down;
43 struct list_head cleanup_list;
44 uint32_t pending_actions[VMW_ACTION_MAX];
45 struct mutex goal_irq_mutex;
46 bool goal_irq_on; /* Protected by @goal_irq_mutex */
47 bool seqno_valid; /* Protected by @lock, and may not be set to true
48 without the @goal_irq_mutex held. */
49 u64 ctx;
50};
51
52struct vmw_user_fence {
53 struct ttm_base_object base;
54 struct vmw_fence_obj fence;
55};
56
57/**
58 * struct vmw_event_fence_action - fence action that delivers a drm event.
59 *
60 * @e: A struct drm_pending_event that controls the event delivery.
61 * @action: A struct vmw_fence_action to hook up to a fence.
62 * @fence: A referenced pointer to the fence to keep it alive while @action
63 * hangs on it.
64 * @dev: Pointer to a struct drm_device so we can access the event stuff.
65 * @kref: Both @e and @action has destructors, so we need to refcount.
66 * @size: Size accounted for this object.
67 * @tv_sec: If non-null, the variable pointed to will be assigned
68 * current time tv_sec val when the fence signals.
69 * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will
70 * be assigned the current time tv_usec val when the fence signals.
71 */
72struct vmw_event_fence_action {
73 struct vmw_fence_action action;
74
75 struct drm_pending_event *event;
76 struct vmw_fence_obj *fence;
77 struct drm_device *dev;
78
79 uint32_t *tv_sec;
80 uint32_t *tv_usec;
81};
82
83static struct vmw_fence_manager *
84fman_from_fence(struct vmw_fence_obj *fence)
85{
86 return container_of(fence->base.lock, struct vmw_fence_manager, lock);
87}
88
89/**
90 * Note on fencing subsystem usage of irqs:
91 * Typically the vmw_fences_update function is called
92 *
93 * a) When a new fence seqno has been submitted by the fifo code.
94 * b) On-demand when we have waiters. Sleeping waiters will switch on the
95 * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE
96 * irq is received. When the last fence waiter is gone, that IRQ is masked
97 * away.
98 *
99 * In situations where there are no waiters and we don't submit any new fences,
100 * fence objects may not be signaled. This is perfectly OK, since there are
101 * no consumers of the signaled data, but that is NOT ok when there are fence
102 * actions attached to a fence. The fencing subsystem then makes use of the
103 * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence
104 * which has an action attached, and each time vmw_fences_update is called,
105 * the subsystem makes sure the fence goal seqno is updated.
106 *
107 * The fence goal seqno irq is on as long as there are unsignaled fence
108 * objects with actions attached to them.
109 */
110
111static void vmw_fence_obj_destroy(struct dma_fence *f)
112{
113 struct vmw_fence_obj *fence =
114 container_of(f, struct vmw_fence_obj, base);
115
116 struct vmw_fence_manager *fman = fman_from_fence(fence);
117 unsigned long irq_flags;
118
119 spin_lock_irqsave(&fman->lock, irq_flags);
120 list_del_init(&fence->head);
121 --fman->num_fence_objects;
122 spin_unlock_irqrestore(&fman->lock, irq_flags);
123 fence->destroy(fence);
124}
125
126static const char *vmw_fence_get_driver_name(struct dma_fence *f)
127{
128 return "vmwgfx";
129}
130
131static const char *vmw_fence_get_timeline_name(struct dma_fence *f)
132{
133 return "svga";
134}
135
136static bool vmw_fence_enable_signaling(struct dma_fence *f)
137{
138 struct vmw_fence_obj *fence =
139 container_of(f, struct vmw_fence_obj, base);
140
141 struct vmw_fence_manager *fman = fman_from_fence(fence);
142 struct vmw_private *dev_priv = fman->dev_priv;
143
144 u32 *fifo_mem = dev_priv->mmio_virt;
145 u32 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
146 if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
147 return false;
148
149 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
150
151 return true;
152}
153
154struct vmwgfx_wait_cb {
155 struct dma_fence_cb base;
156 struct task_struct *task;
157};
158
159static void
160vmwgfx_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
161{
162 struct vmwgfx_wait_cb *wait =
163 container_of(cb, struct vmwgfx_wait_cb, base);
164
165 wake_up_process(wait->task);
166}
167
168static void __vmw_fences_update(struct vmw_fence_manager *fman);
169
170static long vmw_fence_wait(struct dma_fence *f, bool intr, signed long timeout)
171{
172 struct vmw_fence_obj *fence =
173 container_of(f, struct vmw_fence_obj, base);
174
175 struct vmw_fence_manager *fman = fman_from_fence(fence);
176 struct vmw_private *dev_priv = fman->dev_priv;
177 struct vmwgfx_wait_cb cb;
178 long ret = timeout;
179 unsigned long irq_flags;
180
181 if (likely(vmw_fence_obj_signaled(fence)))
182 return timeout;
183
184 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
185 vmw_seqno_waiter_add(dev_priv);
186
187 spin_lock_irqsave(f->lock, irq_flags);
188
189 if (intr && signal_pending(current)) {
190 ret = -ERESTARTSYS;
191 goto out;
192 }
193
194 cb.base.func = vmwgfx_wait_cb;
195 cb.task = current;
196 list_add(&cb.base.node, &f->cb_list);
197
198 while (ret > 0) {
199 __vmw_fences_update(fman);
200 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags))
201 break;
202
203 if (intr)
204 __set_current_state(TASK_INTERRUPTIBLE);
205 else
206 __set_current_state(TASK_UNINTERRUPTIBLE);
207 spin_unlock_irqrestore(f->lock, irq_flags);
208
209 ret = schedule_timeout(ret);
210
211 spin_lock_irqsave(f->lock, irq_flags);
212 if (ret > 0 && intr && signal_pending(current))
213 ret = -ERESTARTSYS;
214 }
215
216 if (!list_empty(&cb.base.node))
217 list_del(&cb.base.node);
218 __set_current_state(TASK_RUNNING);
219
220out:
221 spin_unlock_irqrestore(f->lock, irq_flags);
222
223 vmw_seqno_waiter_remove(dev_priv);
224
225 return ret;
226}
227
228static struct dma_fence_ops vmw_fence_ops = {
229 .get_driver_name = vmw_fence_get_driver_name,
230 .get_timeline_name = vmw_fence_get_timeline_name,
231 .enable_signaling = vmw_fence_enable_signaling,
232 .wait = vmw_fence_wait,
233 .release = vmw_fence_obj_destroy,
234};
235
236
237/**
238 * Execute signal actions on fences recently signaled.
239 * This is done from a workqueue so we don't have to execute
240 * signal actions from atomic context.
241 */
242
243static void vmw_fence_work_func(struct work_struct *work)
244{
245 struct vmw_fence_manager *fman =
246 container_of(work, struct vmw_fence_manager, work);
247 struct list_head list;
248 struct vmw_fence_action *action, *next_action;
249 bool seqno_valid;
250
251 do {
252 INIT_LIST_HEAD(&list);
253 mutex_lock(&fman->goal_irq_mutex);
254
255 spin_lock_irq(&fman->lock);
256 list_splice_init(&fman->cleanup_list, &list);
257 seqno_valid = fman->seqno_valid;
258 spin_unlock_irq(&fman->lock);
259
260 if (!seqno_valid && fman->goal_irq_on) {
261 fman->goal_irq_on = false;
262 vmw_goal_waiter_remove(fman->dev_priv);
263 }
264 mutex_unlock(&fman->goal_irq_mutex);
265
266 if (list_empty(&list))
267 return;
268
269 /*
270 * At this point, only we should be able to manipulate the
271 * list heads of the actions we have on the private list.
272 * hence fman::lock not held.
273 */
274
275 list_for_each_entry_safe(action, next_action, &list, head) {
276 list_del_init(&action->head);
277 if (action->cleanup)
278 action->cleanup(action);
279 }
280 } while (1);
281}
282
283struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv)
284{
285 struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL);
286
287 if (unlikely(fman == NULL))
288 return NULL;
289
290 fman->dev_priv = dev_priv;
291 spin_lock_init(&fman->lock);
292 INIT_LIST_HEAD(&fman->fence_list);
293 INIT_LIST_HEAD(&fman->cleanup_list);
294 INIT_WORK(&fman->work, &vmw_fence_work_func);
295 fman->fifo_down = true;
296 fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence));
297 fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj));
298 fman->event_fence_action_size =
299 ttm_round_pot(sizeof(struct vmw_event_fence_action));
300 mutex_init(&fman->goal_irq_mutex);
301 fman->ctx = dma_fence_context_alloc(1);
302
303 return fman;
304}
305
306void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
307{
308 unsigned long irq_flags;
309 bool lists_empty;
310
311 (void) cancel_work_sync(&fman->work);
312
313 spin_lock_irqsave(&fman->lock, irq_flags);
314 lists_empty = list_empty(&fman->fence_list) &&
315 list_empty(&fman->cleanup_list);
316 spin_unlock_irqrestore(&fman->lock, irq_flags);
317
318 BUG_ON(!lists_empty);
319 kfree(fman);
320}
321
322static int vmw_fence_obj_init(struct vmw_fence_manager *fman,
323 struct vmw_fence_obj *fence, u32 seqno,
324 void (*destroy) (struct vmw_fence_obj *fence))
325{
326 unsigned long irq_flags;
327 int ret = 0;
328
329 dma_fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
330 fman->ctx, seqno);
331 INIT_LIST_HEAD(&fence->seq_passed_actions);
332 fence->destroy = destroy;
333
334 spin_lock_irqsave(&fman->lock, irq_flags);
335 if (unlikely(fman->fifo_down)) {
336 ret = -EBUSY;
337 goto out_unlock;
338 }
339 list_add_tail(&fence->head, &fman->fence_list);
340 ++fman->num_fence_objects;
341
342out_unlock:
343 spin_unlock_irqrestore(&fman->lock, irq_flags);
344 return ret;
345
346}
347
348static void vmw_fences_perform_actions(struct vmw_fence_manager *fman,
349 struct list_head *list)
350{
351 struct vmw_fence_action *action, *next_action;
352
353 list_for_each_entry_safe(action, next_action, list, head) {
354 list_del_init(&action->head);
355 fman->pending_actions[action->type]--;
356 if (action->seq_passed != NULL)
357 action->seq_passed(action);
358
359 /*
360 * Add the cleanup action to the cleanup list so that
361 * it will be performed by a worker task.
362 */
363
364 list_add_tail(&action->head, &fman->cleanup_list);
365 }
366}
367
368/**
369 * vmw_fence_goal_new_locked - Figure out a new device fence goal
370 * seqno if needed.
371 *
372 * @fman: Pointer to a fence manager.
373 * @passed_seqno: The seqno the device currently signals as passed.
374 *
375 * This function should be called with the fence manager lock held.
376 * It is typically called when we have a new passed_seqno, and
377 * we might need to update the fence goal. It checks to see whether
378 * the current fence goal has already passed, and, in that case,
379 * scans through all unsignaled fences to get the next fence object with an
380 * action attached, and sets the seqno of that fence as a new fence goal.
381 *
382 * returns true if the device goal seqno was updated. False otherwise.
383 */
384static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman,
385 u32 passed_seqno)
386{
387 u32 goal_seqno;
388 u32 *fifo_mem;
389 struct vmw_fence_obj *fence;
390
391 if (likely(!fman->seqno_valid))
392 return false;
393
394 fifo_mem = fman->dev_priv->mmio_virt;
395 goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
396 if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP))
397 return false;
398
399 fman->seqno_valid = false;
400 list_for_each_entry(fence, &fman->fence_list, head) {
401 if (!list_empty(&fence->seq_passed_actions)) {
402 fman->seqno_valid = true;
403 vmw_mmio_write(fence->base.seqno,
404 fifo_mem + SVGA_FIFO_FENCE_GOAL);
405 break;
406 }
407 }
408
409 return true;
410}
411
412
413/**
414 * vmw_fence_goal_check_locked - Replace the device fence goal seqno if
415 * needed.
416 *
417 * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be
418 * considered as a device fence goal.
419 *
420 * This function should be called with the fence manager lock held.
421 * It is typically called when an action has been attached to a fence to
422 * check whether the seqno of that fence should be used for a fence
423 * goal interrupt. This is typically needed if the current fence goal is
424 * invalid, or has a higher seqno than that of the current fence object.
425 *
426 * returns true if the device goal seqno was updated. False otherwise.
427 */
428static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence)
429{
430 struct vmw_fence_manager *fman = fman_from_fence(fence);
431 u32 goal_seqno;
432 u32 *fifo_mem;
433
434 if (dma_fence_is_signaled_locked(&fence->base))
435 return false;
436
437 fifo_mem = fman->dev_priv->mmio_virt;
438 goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
439 if (likely(fman->seqno_valid &&
440 goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
441 return false;
442
443 vmw_mmio_write(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
444 fman->seqno_valid = true;
445
446 return true;
447}
448
449static void __vmw_fences_update(struct vmw_fence_manager *fman)
450{
451 struct vmw_fence_obj *fence, *next_fence;
452 struct list_head action_list;
453 bool needs_rerun;
454 uint32_t seqno, new_seqno;
455 u32 *fifo_mem = fman->dev_priv->mmio_virt;
456
457 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
458rerun:
459 list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) {
460 if (seqno - fence->base.seqno < VMW_FENCE_WRAP) {
461 list_del_init(&fence->head);
462 dma_fence_signal_locked(&fence->base);
463 INIT_LIST_HEAD(&action_list);
464 list_splice_init(&fence->seq_passed_actions,
465 &action_list);
466 vmw_fences_perform_actions(fman, &action_list);
467 } else
468 break;
469 }
470
471 /*
472 * Rerun if the fence goal seqno was updated, and the
473 * hardware might have raced with that update, so that
474 * we missed a fence_goal irq.
475 */
476
477 needs_rerun = vmw_fence_goal_new_locked(fman, seqno);
478 if (unlikely(needs_rerun)) {
479 new_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
480 if (new_seqno != seqno) {
481 seqno = new_seqno;
482 goto rerun;
483 }
484 }
485
486 if (!list_empty(&fman->cleanup_list))
487 (void) schedule_work(&fman->work);
488}
489
490void vmw_fences_update(struct vmw_fence_manager *fman)
491{
492 unsigned long irq_flags;
493
494 spin_lock_irqsave(&fman->lock, irq_flags);
495 __vmw_fences_update(fman);
496 spin_unlock_irqrestore(&fman->lock, irq_flags);
497}
498
499bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
500{
501 struct vmw_fence_manager *fman = fman_from_fence(fence);
502
503 if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
504 return 1;
505
506 vmw_fences_update(fman);
507
508 return dma_fence_is_signaled(&fence->base);
509}
510
511int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
512 bool interruptible, unsigned long timeout)
513{
514 long ret = dma_fence_wait_timeout(&fence->base, interruptible, timeout);
515
516 if (likely(ret > 0))
517 return 0;
518 else if (ret == 0)
519 return -EBUSY;
520 else
521 return ret;
522}
523
524void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
525{
526 struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;
527
528 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
529}
530
531static void vmw_fence_destroy(struct vmw_fence_obj *fence)
532{
533 dma_fence_free(&fence->base);
534}
535
536int vmw_fence_create(struct vmw_fence_manager *fman,
537 uint32_t seqno,
538 struct vmw_fence_obj **p_fence)
539{
540 struct vmw_fence_obj *fence;
541 int ret;
542
543 fence = kzalloc(sizeof(*fence), GFP_KERNEL);
544 if (unlikely(fence == NULL))
545 return -ENOMEM;
546
547 ret = vmw_fence_obj_init(fman, fence, seqno,
548 vmw_fence_destroy);
549 if (unlikely(ret != 0))
550 goto out_err_init;
551
552 *p_fence = fence;
553 return 0;
554
555out_err_init:
556 kfree(fence);
557 return ret;
558}
559
560
561static void vmw_user_fence_destroy(struct vmw_fence_obj *fence)
562{
563 struct vmw_user_fence *ufence =
564 container_of(fence, struct vmw_user_fence, fence);
565 struct vmw_fence_manager *fman = fman_from_fence(fence);
566
567 ttm_base_object_kfree(ufence, base);
568 /*
569 * Free kernel space accounting.
570 */
571 ttm_mem_global_free(vmw_mem_glob(fman->dev_priv),
572 fman->user_fence_size);
573}
574
575static void vmw_user_fence_base_release(struct ttm_base_object **p_base)
576{
577 struct ttm_base_object *base = *p_base;
578 struct vmw_user_fence *ufence =
579 container_of(base, struct vmw_user_fence, base);
580 struct vmw_fence_obj *fence = &ufence->fence;
581
582 *p_base = NULL;
583 vmw_fence_obj_unreference(&fence);
584}
585
586int vmw_user_fence_create(struct drm_file *file_priv,
587 struct vmw_fence_manager *fman,
588 uint32_t seqno,
589 struct vmw_fence_obj **p_fence,
590 uint32_t *p_handle)
591{
592 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
593 struct vmw_user_fence *ufence;
594 struct vmw_fence_obj *tmp;
595 struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv);
596 int ret;
597
598 /*
599 * Kernel memory space accounting, since this object may
600 * be created by a user-space request.
601 */
602
603 ret = ttm_mem_global_alloc(mem_glob, fman->user_fence_size,
604 false, false);
605 if (unlikely(ret != 0))
606 return ret;
607
608 ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
609 if (unlikely(ufence == NULL)) {
610 ret = -ENOMEM;
611 goto out_no_object;
612 }
613
614 ret = vmw_fence_obj_init(fman, &ufence->fence, seqno,
615 vmw_user_fence_destroy);
616 if (unlikely(ret != 0)) {
617 kfree(ufence);
618 goto out_no_object;
619 }
620
621 /*
622 * The base object holds a reference which is freed in
623 * vmw_user_fence_base_release.
624 */
625 tmp = vmw_fence_obj_reference(&ufence->fence);
626 ret = ttm_base_object_init(tfile, &ufence->base, false,
627 VMW_RES_FENCE,
628 &vmw_user_fence_base_release, NULL);
629
630
631 if (unlikely(ret != 0)) {
632 /*
633 * Free the base object's reference
634 */
635 vmw_fence_obj_unreference(&tmp);
636 goto out_err;
637 }
638
639 *p_fence = &ufence->fence;
640 *p_handle = ufence->base.hash.key;
641
642 return 0;
643out_err:
644 tmp = &ufence->fence;
645 vmw_fence_obj_unreference(&tmp);
646out_no_object:
647 ttm_mem_global_free(mem_glob, fman->user_fence_size);
648 return ret;
649}
650
651
652/**
653 * vmw_fence_fifo_down - signal all unsignaled fence objects.
654 */
655
656void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
657{
658 struct list_head action_list;
659 int ret;
660
661 /*
662 * The list may be altered while we traverse it, so always
663 * restart when we've released the fman->lock.
664 */
665
666 spin_lock_irq(&fman->lock);
667 fman->fifo_down = true;
668 while (!list_empty(&fman->fence_list)) {
669 struct vmw_fence_obj *fence =
670 list_entry(fman->fence_list.prev, struct vmw_fence_obj,
671 head);
672 dma_fence_get(&fence->base);
673 spin_unlock_irq(&fman->lock);
674
675 ret = vmw_fence_obj_wait(fence, false, false,
676 VMW_FENCE_WAIT_TIMEOUT);
677
678 if (unlikely(ret != 0)) {
679 list_del_init(&fence->head);
680 dma_fence_signal(&fence->base);
681 INIT_LIST_HEAD(&action_list);
682 list_splice_init(&fence->seq_passed_actions,
683 &action_list);
684 vmw_fences_perform_actions(fman, &action_list);
685 }
686
687 BUG_ON(!list_empty(&fence->head));
688 dma_fence_put(&fence->base);
689 spin_lock_irq(&fman->lock);
690 }
691 spin_unlock_irq(&fman->lock);
692}
693
694void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
695{
696 unsigned long irq_flags;
697
698 spin_lock_irqsave(&fman->lock, irq_flags);
699 fman->fifo_down = false;
700 spin_unlock_irqrestore(&fman->lock, irq_flags);
701}
702
703
704/**
705 * vmw_fence_obj_lookup - Look up a user-space fence object
706 *
707 * @tfile: A struct ttm_object_file identifying the caller.
708 * @handle: A handle identifying the fence object.
709 * @return: A struct vmw_user_fence base ttm object on success or
710 * an error pointer on failure.
711 *
712 * The fence object is looked up and type-checked. The caller needs
713 * to have opened the fence object first, but since that happens on
714 * creation and fence objects aren't shareable, that's not an
715 * issue currently.
716 */
717static struct ttm_base_object *
718vmw_fence_obj_lookup(struct ttm_object_file *tfile, u32 handle)
719{
720 struct ttm_base_object *base = ttm_base_object_lookup(tfile, handle);
721
722 if (!base) {
723 pr_err("Invalid fence object handle 0x%08lx.\n",
724 (unsigned long)handle);
725 return ERR_PTR(-EINVAL);
726 }
727
728 if (base->refcount_release != vmw_user_fence_base_release) {
729 pr_err("Invalid fence object handle 0x%08lx.\n",
730 (unsigned long)handle);
731 ttm_base_object_unref(&base);
732 return ERR_PTR(-EINVAL);
733 }
734
735 return base;
736}
737
738
739int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data,
740 struct drm_file *file_priv)
741{
742 struct drm_vmw_fence_wait_arg *arg =
743 (struct drm_vmw_fence_wait_arg *)data;
744 unsigned long timeout;
745 struct ttm_base_object *base;
746 struct vmw_fence_obj *fence;
747 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
748 int ret;
749 uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ);
750
751 /*
752 * 64-bit division not present on 32-bit systems, so do an
753 * approximation. (Divide by 1000000).
754 */
755
756 wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) -
757 (wait_timeout >> 26);
758
759 if (!arg->cookie_valid) {
760 arg->cookie_valid = 1;
761 arg->kernel_cookie = jiffies + wait_timeout;
762 }
763
764 base = vmw_fence_obj_lookup(tfile, arg->handle);
765 if (IS_ERR(base))
766 return PTR_ERR(base);
767
768 fence = &(container_of(base, struct vmw_user_fence, base)->fence);
769
770 timeout = jiffies;
771 if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) {
772 ret = ((vmw_fence_obj_signaled(fence)) ?
773 0 : -EBUSY);
774 goto out;
775 }
776
777 timeout = (unsigned long)arg->kernel_cookie - timeout;
778
779 ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout);
780
781out:
782 ttm_base_object_unref(&base);
783
784 /*
785 * Optionally unref the fence object.
786 */
787
788 if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF))
789 return ttm_ref_object_base_unref(tfile, arg->handle,
790 TTM_REF_USAGE);
791 return ret;
792}
793
794int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data,
795 struct drm_file *file_priv)
796{
797 struct drm_vmw_fence_signaled_arg *arg =
798 (struct drm_vmw_fence_signaled_arg *) data;
799 struct ttm_base_object *base;
800 struct vmw_fence_obj *fence;
801 struct vmw_fence_manager *fman;
802 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
803 struct vmw_private *dev_priv = vmw_priv(dev);
804
805 base = vmw_fence_obj_lookup(tfile, arg->handle);
806 if (IS_ERR(base))
807 return PTR_ERR(base);
808
809 fence = &(container_of(base, struct vmw_user_fence, base)->fence);
810 fman = fman_from_fence(fence);
811
812 arg->signaled = vmw_fence_obj_signaled(fence);
813
814 arg->signaled_flags = arg->flags;
815 spin_lock_irq(&fman->lock);
816 arg->passed_seqno = dev_priv->last_read_seqno;
817 spin_unlock_irq(&fman->lock);
818
819 ttm_base_object_unref(&base);
820
821 return 0;
822}
823
824
825int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data,
826 struct drm_file *file_priv)
827{
828 struct drm_vmw_fence_arg *arg =
829 (struct drm_vmw_fence_arg *) data;
830
831 return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
832 arg->handle,
833 TTM_REF_USAGE);
834}
835
836/**
837 * vmw_event_fence_action_seq_passed
838 *
839 * @action: The struct vmw_fence_action embedded in a struct
840 * vmw_event_fence_action.
841 *
842 * This function is called when the seqno of the fence where @action is
843 * attached has passed. It queues the event on the submitter's event list.
844 * This function is always called from atomic context, and may be called
845 * from irq context.
846 */
847static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action)
848{
849 struct vmw_event_fence_action *eaction =
850 container_of(action, struct vmw_event_fence_action, action);
851 struct drm_device *dev = eaction->dev;
852 struct drm_pending_event *event = eaction->event;
853 struct drm_file *file_priv;
854 unsigned long irq_flags;
855
856 if (unlikely(event == NULL))
857 return;
858
859 file_priv = event->file_priv;
860 spin_lock_irqsave(&dev->event_lock, irq_flags);
861
862 if (likely(eaction->tv_sec != NULL)) {
863 struct timeval tv;
864
865 do_gettimeofday(&tv);
866 *eaction->tv_sec = tv.tv_sec;
867 *eaction->tv_usec = tv.tv_usec;
868 }
869
870 drm_send_event_locked(dev, eaction->event);
871 eaction->event = NULL;
872 spin_unlock_irqrestore(&dev->event_lock, irq_flags);
873}
874
875/**
876 * vmw_event_fence_action_cleanup
877 *
878 * @action: The struct vmw_fence_action embedded in a struct
879 * vmw_event_fence_action.
880 *
881 * This function is the struct vmw_fence_action destructor. It's typically
882 * called from a workqueue.
883 */
884static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action)
885{
886 struct vmw_event_fence_action *eaction =
887 container_of(action, struct vmw_event_fence_action, action);
888
889 vmw_fence_obj_unreference(&eaction->fence);
890 kfree(eaction);
891}
892
893
894/**
895 * vmw_fence_obj_add_action - Add an action to a fence object.
896 *
897 * @fence - The fence object.
898 * @action - The action to add.
899 *
900 * Note that the action callbacks may be executed before this function
901 * returns.
902 */
903static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence,
904 struct vmw_fence_action *action)
905{
906 struct vmw_fence_manager *fman = fman_from_fence(fence);
907 unsigned long irq_flags;
908 bool run_update = false;
909
910 mutex_lock(&fman->goal_irq_mutex);
911 spin_lock_irqsave(&fman->lock, irq_flags);
912
913 fman->pending_actions[action->type]++;
914 if (dma_fence_is_signaled_locked(&fence->base)) {
915 struct list_head action_list;
916
917 INIT_LIST_HEAD(&action_list);
918 list_add_tail(&action->head, &action_list);
919 vmw_fences_perform_actions(fman, &action_list);
920 } else {
921 list_add_tail(&action->head, &fence->seq_passed_actions);
922
923 /*
924 * This function may set fman::seqno_valid, so it must
925 * be run with the goal_irq_mutex held.
926 */
927 run_update = vmw_fence_goal_check_locked(fence);
928 }
929
930 spin_unlock_irqrestore(&fman->lock, irq_flags);
931
932 if (run_update) {
933 if (!fman->goal_irq_on) {
934 fman->goal_irq_on = true;
935 vmw_goal_waiter_add(fman->dev_priv);
936 }
937 vmw_fences_update(fman);
938 }
939 mutex_unlock(&fman->goal_irq_mutex);
940
941}
942
943/**
944 * vmw_event_fence_action_create - Post an event for sending when a fence
945 * object seqno has passed.
946 *
947 * @file_priv: The file connection on which the event should be posted.
948 * @fence: The fence object on which to post the event.
949 * @event: Event to be posted. This event should've been alloced
950 * using k[mz]alloc, and should've been completely initialized.
951 * @interruptible: Interruptible waits if possible.
952 *
953 * As a side effect, the object pointed to by @event may have been
954 * freed when this function returns. If this function returns with
955 * an error code, the caller needs to free that object.
956 */
957
958int vmw_event_fence_action_queue(struct drm_file *file_priv,
959 struct vmw_fence_obj *fence,
960 struct drm_pending_event *event,
961 uint32_t *tv_sec,
962 uint32_t *tv_usec,
963 bool interruptible)
964{
965 struct vmw_event_fence_action *eaction;
966 struct vmw_fence_manager *fman = fman_from_fence(fence);
967
968 eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
969 if (unlikely(eaction == NULL))
970 return -ENOMEM;
971
972 eaction->event = event;
973
974 eaction->action.seq_passed = vmw_event_fence_action_seq_passed;
975 eaction->action.cleanup = vmw_event_fence_action_cleanup;
976 eaction->action.type = VMW_ACTION_EVENT;
977
978 eaction->fence = vmw_fence_obj_reference(fence);
979 eaction->dev = fman->dev_priv->dev;
980 eaction->tv_sec = tv_sec;
981 eaction->tv_usec = tv_usec;
982
983 vmw_fence_obj_add_action(fence, &eaction->action);
984
985 return 0;
986}
987
988struct vmw_event_fence_pending {
989 struct drm_pending_event base;
990 struct drm_vmw_event_fence event;
991};
992
993static int vmw_event_fence_action_create(struct drm_file *file_priv,
994 struct vmw_fence_obj *fence,
995 uint32_t flags,
996 uint64_t user_data,
997 bool interruptible)
998{
999 struct vmw_event_fence_pending *event;
1000 struct vmw_fence_manager *fman = fman_from_fence(fence);
1001 struct drm_device *dev = fman->dev_priv->dev;
1002 int ret;
1003
1004 event = kzalloc(sizeof(*event), GFP_KERNEL);
1005 if (unlikely(event == NULL)) {
1006 DRM_ERROR("Failed to allocate an event.\n");
1007 ret = -ENOMEM;
1008 goto out_no_space;
1009 }
1010
1011 event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
1012 event->event.base.length = sizeof(*event);
1013 event->event.user_data = user_data;
1014
1015 ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);
1016
1017 if (unlikely(ret != 0)) {
1018 DRM_ERROR("Failed to allocate event space for this file.\n");
1019 kfree(event);
1020 goto out_no_space;
1021 }
1022
1023 if (flags & DRM_VMW_FE_FLAG_REQ_TIME)
1024 ret = vmw_event_fence_action_queue(file_priv, fence,
1025 &event->base,
1026 &event->event.tv_sec,
1027 &event->event.tv_usec,
1028 interruptible);
1029 else
1030 ret = vmw_event_fence_action_queue(file_priv, fence,
1031 &event->base,
1032 NULL,
1033 NULL,
1034 interruptible);
1035 if (ret != 0)
1036 goto out_no_queue;
1037
1038 return 0;
1039
1040out_no_queue:
1041 drm_event_cancel_free(dev, &event->base);
1042out_no_space:
1043 return ret;
1044}
1045
1046int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
1047 struct drm_file *file_priv)
1048{
1049 struct vmw_private *dev_priv = vmw_priv(dev);
1050 struct drm_vmw_fence_event_arg *arg =
1051 (struct drm_vmw_fence_event_arg *) data;
1052 struct vmw_fence_obj *fence = NULL;
1053 struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
1054 struct ttm_object_file *tfile = vmw_fp->tfile;
1055 struct drm_vmw_fence_rep __user *user_fence_rep =
1056 (struct drm_vmw_fence_rep __user *)(unsigned long)
1057 arg->fence_rep;
1058 uint32_t handle;
1059 int ret;
1060
1061 /*
1062 * Look up an existing fence object,
1063 * and if user-space wants a new reference,
1064 * add one.
1065 */
1066 if (arg->handle) {
1067 struct ttm_base_object *base =
1068 vmw_fence_obj_lookup(tfile, arg->handle);
1069
1070 if (IS_ERR(base))
1071 return PTR_ERR(base);
1072
1073 fence = &(container_of(base, struct vmw_user_fence,
1074 base)->fence);
1075 (void) vmw_fence_obj_reference(fence);
1076
1077 if (user_fence_rep != NULL) {
1078 ret = ttm_ref_object_add(vmw_fp->tfile, base,
1079 TTM_REF_USAGE, NULL, false);
1080 if (unlikely(ret != 0)) {
1081 DRM_ERROR("Failed to reference a fence "
1082 "object.\n");
1083 goto out_no_ref_obj;
1084 }
1085 handle = base->hash.key;
1086 }
1087 ttm_base_object_unref(&base);
1088 }
1089
1090 /*
1091 * Create a new fence object.
1092 */
1093 if (!fence) {
1094 ret = vmw_execbuf_fence_commands(file_priv, dev_priv,
1095 &fence,
1096 (user_fence_rep) ?
1097 &handle : NULL);
1098 if (unlikely(ret != 0)) {
1099 DRM_ERROR("Fence event failed to create fence.\n");
1100 return ret;
1101 }
1102 }
1103
1104 BUG_ON(fence == NULL);
1105
1106 ret = vmw_event_fence_action_create(file_priv, fence,
1107 arg->flags,
1108 arg->user_data,
1109 true);
1110 if (unlikely(ret != 0)) {
1111 if (ret != -ERESTARTSYS)
1112 DRM_ERROR("Failed to attach event to fence.\n");
1113 goto out_no_create;
1114 }
1115
1116 vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
1117 handle);
1118 vmw_fence_obj_unreference(&fence);
1119 return 0;
1120out_no_create:
1121 if (user_fence_rep != NULL)
1122 ttm_ref_object_base_unref(tfile, handle, TTM_REF_USAGE);
1123out_no_ref_obj:
1124 vmw_fence_obj_unreference(&fence);
1125 return ret;
1126}