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1/*
2 * Copyright 2013 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Dave Airlie
23 * Alon Levy
24 */
25
26/* QXL cmd/ring handling */
27
28#include <linux/delay.h>
29
30#include <drm/drm_util.h>
31
32#include "qxl_drv.h"
33#include "qxl_object.h"
34
35static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap);
36
37struct ring {
38 struct qxl_ring_header header;
39 uint8_t elements[];
40};
41
42struct qxl_ring {
43 struct ring *ring;
44 int element_size;
45 int n_elements;
46 int prod_notify;
47 wait_queue_head_t *push_event;
48 spinlock_t lock;
49};
50
51void qxl_ring_free(struct qxl_ring *ring)
52{
53 kfree(ring);
54}
55
56void qxl_ring_init_hdr(struct qxl_ring *ring)
57{
58 ring->ring->header.notify_on_prod = ring->n_elements;
59}
60
61struct qxl_ring *
62qxl_ring_create(struct qxl_ring_header *header,
63 int element_size,
64 int n_elements,
65 int prod_notify,
66 bool set_prod_notify,
67 wait_queue_head_t *push_event)
68{
69 struct qxl_ring *ring;
70
71 ring = kmalloc(sizeof(*ring), GFP_KERNEL);
72 if (!ring)
73 return NULL;
74
75 ring->ring = (struct ring *)header;
76 ring->element_size = element_size;
77 ring->n_elements = n_elements;
78 ring->prod_notify = prod_notify;
79 ring->push_event = push_event;
80 if (set_prod_notify)
81 qxl_ring_init_hdr(ring);
82 spin_lock_init(&ring->lock);
83 return ring;
84}
85
86static int qxl_check_header(struct qxl_ring *ring)
87{
88 int ret;
89 struct qxl_ring_header *header = &(ring->ring->header);
90 unsigned long flags;
91
92 spin_lock_irqsave(&ring->lock, flags);
93 ret = header->prod - header->cons < header->num_items;
94 if (ret == 0)
95 header->notify_on_cons = header->cons + 1;
96 spin_unlock_irqrestore(&ring->lock, flags);
97 return ret;
98}
99
100int qxl_check_idle(struct qxl_ring *ring)
101{
102 int ret;
103 struct qxl_ring_header *header = &(ring->ring->header);
104 unsigned long flags;
105
106 spin_lock_irqsave(&ring->lock, flags);
107 ret = header->prod == header->cons;
108 spin_unlock_irqrestore(&ring->lock, flags);
109 return ret;
110}
111
112int qxl_ring_push(struct qxl_ring *ring,
113 const void *new_elt, bool interruptible)
114{
115 struct qxl_ring_header *header = &(ring->ring->header);
116 uint8_t *elt;
117 int idx, ret;
118 unsigned long flags;
119
120 spin_lock_irqsave(&ring->lock, flags);
121 if (header->prod - header->cons == header->num_items) {
122 header->notify_on_cons = header->cons + 1;
123 mb();
124 spin_unlock_irqrestore(&ring->lock, flags);
125 if (!drm_can_sleep()) {
126 while (!qxl_check_header(ring))
127 udelay(1);
128 } else {
129 if (interruptible) {
130 ret = wait_event_interruptible(*ring->push_event,
131 qxl_check_header(ring));
132 if (ret)
133 return ret;
134 } else {
135 wait_event(*ring->push_event,
136 qxl_check_header(ring));
137 }
138
139 }
140 spin_lock_irqsave(&ring->lock, flags);
141 }
142
143 idx = header->prod & (ring->n_elements - 1);
144 elt = ring->ring->elements + idx * ring->element_size;
145
146 memcpy((void *)elt, new_elt, ring->element_size);
147
148 header->prod++;
149
150 mb();
151
152 if (header->prod == header->notify_on_prod)
153 outb(0, ring->prod_notify);
154
155 spin_unlock_irqrestore(&ring->lock, flags);
156 return 0;
157}
158
159static bool qxl_ring_pop(struct qxl_ring *ring,
160 void *element)
161{
162 volatile struct qxl_ring_header *header = &(ring->ring->header);
163 volatile uint8_t *ring_elt;
164 int idx;
165 unsigned long flags;
166
167 spin_lock_irqsave(&ring->lock, flags);
168 if (header->cons == header->prod) {
169 header->notify_on_prod = header->cons + 1;
170 spin_unlock_irqrestore(&ring->lock, flags);
171 return false;
172 }
173
174 idx = header->cons & (ring->n_elements - 1);
175 ring_elt = ring->ring->elements + idx * ring->element_size;
176
177 memcpy(element, (void *)ring_elt, ring->element_size);
178
179 header->cons++;
180
181 spin_unlock_irqrestore(&ring->lock, flags);
182 return true;
183}
184
185int
186qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *release,
187 uint32_t type, bool interruptible)
188{
189 struct qxl_command cmd;
190
191 cmd.type = type;
192 cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset);
193
194 return qxl_ring_push(qdev->command_ring, &cmd, interruptible);
195}
196
197int
198qxl_push_cursor_ring_release(struct qxl_device *qdev, struct qxl_release *release,
199 uint32_t type, bool interruptible)
200{
201 struct qxl_command cmd;
202
203 cmd.type = type;
204 cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset);
205
206 return qxl_ring_push(qdev->cursor_ring, &cmd, interruptible);
207}
208
209bool qxl_queue_garbage_collect(struct qxl_device *qdev, bool flush)
210{
211 if (!qxl_check_idle(qdev->release_ring)) {
212 schedule_work(&qdev->gc_work);
213 if (flush)
214 flush_work(&qdev->gc_work);
215 return true;
216 }
217 return false;
218}
219
220int qxl_garbage_collect(struct qxl_device *qdev)
221{
222 struct qxl_release *release;
223 uint64_t id, next_id;
224 int i = 0;
225 union qxl_release_info *info;
226
227 while (qxl_ring_pop(qdev->release_ring, &id)) {
228 DRM_DEBUG_DRIVER("popped %lld\n", id);
229 while (id) {
230 release = qxl_release_from_id_locked(qdev, id);
231 if (release == NULL)
232 break;
233
234 info = qxl_release_map(qdev, release);
235 next_id = info->next;
236 qxl_release_unmap(qdev, release, info);
237
238 DRM_DEBUG_DRIVER("popped %lld, next %lld\n", id,
239 next_id);
240
241 switch (release->type) {
242 case QXL_RELEASE_DRAWABLE:
243 case QXL_RELEASE_SURFACE_CMD:
244 case QXL_RELEASE_CURSOR_CMD:
245 break;
246 default:
247 DRM_ERROR("unexpected release type\n");
248 break;
249 }
250 id = next_id;
251
252 qxl_release_free(qdev, release);
253 ++i;
254 }
255 }
256
257 DRM_DEBUG_DRIVER("%d\n", i);
258
259 return i;
260}
261
262int qxl_alloc_bo_reserved(struct qxl_device *qdev,
263 struct qxl_release *release,
264 unsigned long size,
265 struct qxl_bo **_bo)
266{
267 struct qxl_bo *bo;
268 int ret;
269
270 ret = qxl_bo_create(qdev, size, false /* not kernel - device */,
271 false, QXL_GEM_DOMAIN_VRAM, NULL, &bo);
272 if (ret) {
273 DRM_ERROR("failed to allocate VRAM BO\n");
274 return ret;
275 }
276 ret = qxl_release_list_add(release, bo);
277 if (ret)
278 goto out_unref;
279
280 *_bo = bo;
281 return 0;
282out_unref:
283 qxl_bo_unref(&bo);
284 return ret;
285}
286
287static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port, bool intr)
288{
289 int irq_num;
290 long addr = qdev->io_base + port;
291 int ret;
292
293 mutex_lock(&qdev->async_io_mutex);
294 irq_num = atomic_read(&qdev->irq_received_io_cmd);
295 if (qdev->last_sent_io_cmd > irq_num) {
296 if (intr)
297 ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
298 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
299 else
300 ret = wait_event_timeout(qdev->io_cmd_event,
301 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
302 /* 0 is timeout, just bail the "hw" has gone away */
303 if (ret <= 0)
304 goto out;
305 irq_num = atomic_read(&qdev->irq_received_io_cmd);
306 }
307 outb(val, addr);
308 qdev->last_sent_io_cmd = irq_num + 1;
309 if (intr)
310 ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
311 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
312 else
313 ret = wait_event_timeout(qdev->io_cmd_event,
314 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
315out:
316 if (ret > 0)
317 ret = 0;
318 mutex_unlock(&qdev->async_io_mutex);
319 return ret;
320}
321
322static void wait_for_io_cmd(struct qxl_device *qdev, uint8_t val, long port)
323{
324 int ret;
325
326restart:
327 ret = wait_for_io_cmd_user(qdev, val, port, false);
328 if (ret == -ERESTARTSYS)
329 goto restart;
330}
331
332int qxl_io_update_area(struct qxl_device *qdev, struct qxl_bo *surf,
333 const struct qxl_rect *area)
334{
335 int surface_id;
336 uint32_t surface_width, surface_height;
337 int ret;
338
339 if (!surf->hw_surf_alloc)
340 DRM_ERROR("got io update area with no hw surface\n");
341
342 if (surf->is_primary)
343 surface_id = 0;
344 else
345 surface_id = surf->surface_id;
346 surface_width = surf->surf.width;
347 surface_height = surf->surf.height;
348
349 if (area->left < 0 || area->top < 0 ||
350 area->right > surface_width || area->bottom > surface_height)
351 return -EINVAL;
352
353 mutex_lock(&qdev->update_area_mutex);
354 qdev->ram_header->update_area = *area;
355 qdev->ram_header->update_surface = surface_id;
356 ret = wait_for_io_cmd_user(qdev, 0, QXL_IO_UPDATE_AREA_ASYNC, true);
357 mutex_unlock(&qdev->update_area_mutex);
358 return ret;
359}
360
361void qxl_io_notify_oom(struct qxl_device *qdev)
362{
363 outb(0, qdev->io_base + QXL_IO_NOTIFY_OOM);
364}
365
366void qxl_io_flush_release(struct qxl_device *qdev)
367{
368 outb(0, qdev->io_base + QXL_IO_FLUSH_RELEASE);
369}
370
371void qxl_io_flush_surfaces(struct qxl_device *qdev)
372{
373 wait_for_io_cmd(qdev, 0, QXL_IO_FLUSH_SURFACES_ASYNC);
374}
375
376void qxl_io_destroy_primary(struct qxl_device *qdev)
377{
378 wait_for_io_cmd(qdev, 0, QXL_IO_DESTROY_PRIMARY_ASYNC);
379 qdev->primary_bo->is_primary = false;
380 drm_gem_object_put(&qdev->primary_bo->tbo.base);
381 qdev->primary_bo = NULL;
382}
383
384void qxl_io_create_primary(struct qxl_device *qdev, struct qxl_bo *bo)
385{
386 struct qxl_surface_create *create;
387
388 if (WARN_ON(qdev->primary_bo))
389 return;
390
391 DRM_DEBUG_DRIVER("qdev %p, ram_header %p\n", qdev, qdev->ram_header);
392 create = &qdev->ram_header->create_surface;
393 create->format = bo->surf.format;
394 create->width = bo->surf.width;
395 create->height = bo->surf.height;
396 create->stride = bo->surf.stride;
397 create->mem = qxl_bo_physical_address(qdev, bo, 0);
398
399 DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr);
400
401 create->flags = QXL_SURF_FLAG_KEEP_DATA;
402 create->type = QXL_SURF_TYPE_PRIMARY;
403
404 wait_for_io_cmd(qdev, 0, QXL_IO_CREATE_PRIMARY_ASYNC);
405 qdev->primary_bo = bo;
406 qdev->primary_bo->is_primary = true;
407 drm_gem_object_get(&qdev->primary_bo->tbo.base);
408}
409
410void qxl_io_memslot_add(struct qxl_device *qdev, uint8_t id)
411{
412 DRM_DEBUG_DRIVER("qxl_memslot_add %d\n", id);
413 wait_for_io_cmd(qdev, id, QXL_IO_MEMSLOT_ADD_ASYNC);
414}
415
416void qxl_io_reset(struct qxl_device *qdev)
417{
418 outb(0, qdev->io_base + QXL_IO_RESET);
419}
420
421void qxl_io_monitors_config(struct qxl_device *qdev)
422{
423 wait_for_io_cmd(qdev, 0, QXL_IO_MONITORS_CONFIG_ASYNC);
424}
425
426int qxl_surface_id_alloc(struct qxl_device *qdev,
427 struct qxl_bo *surf)
428{
429 uint32_t handle;
430 int idr_ret;
431 int count = 0;
432again:
433 idr_preload(GFP_ATOMIC);
434 spin_lock(&qdev->surf_id_idr_lock);
435 idr_ret = idr_alloc(&qdev->surf_id_idr, NULL, 1, 0, GFP_NOWAIT);
436 spin_unlock(&qdev->surf_id_idr_lock);
437 idr_preload_end();
438 if (idr_ret < 0)
439 return idr_ret;
440 handle = idr_ret;
441
442 if (handle >= qdev->rom->n_surfaces) {
443 count++;
444 spin_lock(&qdev->surf_id_idr_lock);
445 idr_remove(&qdev->surf_id_idr, handle);
446 spin_unlock(&qdev->surf_id_idr_lock);
447 qxl_reap_surface_id(qdev, 2);
448 goto again;
449 }
450 surf->surface_id = handle;
451
452 spin_lock(&qdev->surf_id_idr_lock);
453 qdev->last_alloced_surf_id = handle;
454 spin_unlock(&qdev->surf_id_idr_lock);
455 return 0;
456}
457
458void qxl_surface_id_dealloc(struct qxl_device *qdev,
459 uint32_t surface_id)
460{
461 spin_lock(&qdev->surf_id_idr_lock);
462 idr_remove(&qdev->surf_id_idr, surface_id);
463 spin_unlock(&qdev->surf_id_idr_lock);
464}
465
466int qxl_hw_surface_alloc(struct qxl_device *qdev,
467 struct qxl_bo *surf)
468{
469 struct qxl_surface_cmd *cmd;
470 struct qxl_release *release;
471 int ret;
472
473 if (surf->hw_surf_alloc)
474 return 0;
475
476 ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_CREATE,
477 NULL,
478 &release);
479 if (ret)
480 return ret;
481
482 ret = qxl_release_reserve_list(release, true);
483 if (ret) {
484 qxl_release_free(qdev, release);
485 return ret;
486 }
487 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release);
488 cmd->type = QXL_SURFACE_CMD_CREATE;
489 cmd->flags = QXL_SURF_FLAG_KEEP_DATA;
490 cmd->u.surface_create.format = surf->surf.format;
491 cmd->u.surface_create.width = surf->surf.width;
492 cmd->u.surface_create.height = surf->surf.height;
493 cmd->u.surface_create.stride = surf->surf.stride;
494 cmd->u.surface_create.data = qxl_bo_physical_address(qdev, surf, 0);
495 cmd->surface_id = surf->surface_id;
496 qxl_release_unmap(qdev, release, &cmd->release_info);
497
498 surf->surf_create = release;
499
500 /* no need to add a release to the fence for this surface bo,
501 since it is only released when we ask to destroy the surface
502 and it would never signal otherwise */
503 qxl_release_fence_buffer_objects(release);
504 qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false);
505
506 surf->hw_surf_alloc = true;
507 spin_lock(&qdev->surf_id_idr_lock);
508 idr_replace(&qdev->surf_id_idr, surf, surf->surface_id);
509 spin_unlock(&qdev->surf_id_idr_lock);
510 return 0;
511}
512
513int qxl_hw_surface_dealloc(struct qxl_device *qdev,
514 struct qxl_bo *surf)
515{
516 struct qxl_surface_cmd *cmd;
517 struct qxl_release *release;
518 int ret;
519 int id;
520
521 if (!surf->hw_surf_alloc)
522 return 0;
523
524 ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_DESTROY,
525 surf->surf_create,
526 &release);
527 if (ret)
528 return ret;
529
530 surf->surf_create = NULL;
531 /* remove the surface from the idr, but not the surface id yet */
532 spin_lock(&qdev->surf_id_idr_lock);
533 idr_replace(&qdev->surf_id_idr, NULL, surf->surface_id);
534 spin_unlock(&qdev->surf_id_idr_lock);
535 surf->hw_surf_alloc = false;
536
537 id = surf->surface_id;
538 surf->surface_id = 0;
539
540 release->surface_release_id = id;
541 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release);
542 cmd->type = QXL_SURFACE_CMD_DESTROY;
543 cmd->surface_id = id;
544 qxl_release_unmap(qdev, release, &cmd->release_info);
545
546 qxl_release_fence_buffer_objects(release);
547 qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false);
548
549 return 0;
550}
551
552static int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf)
553{
554 struct qxl_rect rect;
555 int ret;
556
557 /* if we are evicting, we need to make sure the surface is up
558 to date */
559 rect.left = 0;
560 rect.right = surf->surf.width;
561 rect.top = 0;
562 rect.bottom = surf->surf.height;
563retry:
564 ret = qxl_io_update_area(qdev, surf, &rect);
565 if (ret == -ERESTARTSYS)
566 goto retry;
567 return ret;
568}
569
570static void qxl_surface_evict_locked(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area)
571{
572 /* no need to update area if we are just freeing the surface normally */
573 if (do_update_area)
574 qxl_update_surface(qdev, surf);
575
576 /* nuke the surface id at the hw */
577 qxl_hw_surface_dealloc(qdev, surf);
578}
579
580void qxl_surface_evict(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area)
581{
582 mutex_lock(&qdev->surf_evict_mutex);
583 qxl_surface_evict_locked(qdev, surf, do_update_area);
584 mutex_unlock(&qdev->surf_evict_mutex);
585}
586
587static int qxl_reap_surf(struct qxl_device *qdev, struct qxl_bo *surf, bool stall)
588{
589 int ret;
590
591 ret = qxl_bo_reserve(surf, false);
592 if (ret)
593 return ret;
594
595 if (stall)
596 mutex_unlock(&qdev->surf_evict_mutex);
597
598 ret = ttm_bo_wait(&surf->tbo, true, !stall);
599
600 if (stall)
601 mutex_lock(&qdev->surf_evict_mutex);
602 if (ret) {
603 qxl_bo_unreserve(surf);
604 return ret;
605 }
606
607 qxl_surface_evict_locked(qdev, surf, true);
608 qxl_bo_unreserve(surf);
609 return 0;
610}
611
612static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap)
613{
614 int num_reaped = 0;
615 int i, ret;
616 bool stall = false;
617 int start = 0;
618
619 mutex_lock(&qdev->surf_evict_mutex);
620again:
621
622 spin_lock(&qdev->surf_id_idr_lock);
623 start = qdev->last_alloced_surf_id + 1;
624 spin_unlock(&qdev->surf_id_idr_lock);
625
626 for (i = start; i < start + qdev->rom->n_surfaces; i++) {
627 void *objptr;
628 int surfid = i % qdev->rom->n_surfaces;
629
630 /* this avoids the case where the objects is in the
631 idr but has been evicted half way - its makes
632 the idr lookup atomic with the eviction */
633 spin_lock(&qdev->surf_id_idr_lock);
634 objptr = idr_find(&qdev->surf_id_idr, surfid);
635 spin_unlock(&qdev->surf_id_idr_lock);
636
637 if (!objptr)
638 continue;
639
640 ret = qxl_reap_surf(qdev, objptr, stall);
641 if (ret == 0)
642 num_reaped++;
643 if (num_reaped >= max_to_reap)
644 break;
645 }
646 if (num_reaped == 0 && stall == false) {
647 stall = true;
648 goto again;
649 }
650
651 mutex_unlock(&qdev->surf_evict_mutex);
652 if (num_reaped) {
653 usleep_range(500, 1000);
654 qxl_queue_garbage_collect(qdev, true);
655 }
656
657 return 0;
658}