source: src/linux/universal/linux-4.9/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 6 weeks ago

kernel update

File size: 29.7 KB
Line 
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 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 fence *f)
127{
128        return "vmwgfx";
129}
130
131static const char *vmw_fence_get_timeline_name(struct fence *f)
132{
133        return "svga";
134}
135
136static bool vmw_fence_enable_signaling(struct 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 fence_cb base;
156        struct task_struct *task;
157};
158
159static void
160vmwgfx_wait_cb(struct fence *fence, struct 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 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(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 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 = 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        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 (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                        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(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
504                return 1;
505
506        vmw_fences_update(fman);
507
508        return 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 = 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        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                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                        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                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 (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}
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