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(objp: ring);
54}
55
56struct qxl_ring *
57qxl_ring_create(struct qxl_ring_header *header,
58 int element_size,
59 int n_elements,
60 int prod_notify,
61 wait_queue_head_t *push_event)
62{
63 struct qxl_ring *ring;
64
65 ring = kmalloc(size: sizeof(*ring), GFP_KERNEL);
66 if (!ring)
67 return NULL;
68
69 ring->ring = (struct ring *)header;
70 ring->element_size = element_size;
71 ring->n_elements = n_elements;
72 ring->prod_notify = prod_notify;
73 ring->push_event = push_event;
74 spin_lock_init(&ring->lock);
75 return ring;
76}
77
78static int qxl_check_header(struct qxl_ring *ring)
79{
80 int ret;
81 struct qxl_ring_header *header = &(ring->ring->header);
82 unsigned long flags;
83
84 spin_lock_irqsave(&ring->lock, flags);
85 ret = header->prod - header->cons < header->num_items;
86 if (ret == 0)
87 header->notify_on_cons = header->cons + 1;
88 spin_unlock_irqrestore(lock: &ring->lock, flags);
89 return ret;
90}
91
92int qxl_check_idle(struct qxl_ring *ring)
93{
94 int ret;
95 struct qxl_ring_header *header = &(ring->ring->header);
96 unsigned long flags;
97
98 spin_lock_irqsave(&ring->lock, flags);
99 ret = header->prod == header->cons;
100 spin_unlock_irqrestore(lock: &ring->lock, flags);
101 return ret;
102}
103
104int qxl_ring_push(struct qxl_ring *ring,
105 const void *new_elt, bool interruptible)
106{
107 struct qxl_ring_header *header = &(ring->ring->header);
108 uint8_t *elt;
109 int idx, ret;
110 unsigned long flags;
111
112 spin_lock_irqsave(&ring->lock, flags);
113 if (header->prod - header->cons == header->num_items) {
114 header->notify_on_cons = header->cons + 1;
115 mb();
116 spin_unlock_irqrestore(lock: &ring->lock, flags);
117 if (!drm_can_sleep()) {
118 while (!qxl_check_header(ring))
119 udelay(1);
120 } else {
121 if (interruptible) {
122 ret = wait_event_interruptible(*ring->push_event,
123 qxl_check_header(ring));
124 if (ret)
125 return ret;
126 } else {
127 wait_event(*ring->push_event,
128 qxl_check_header(ring));
129 }
130
131 }
132 spin_lock_irqsave(&ring->lock, flags);
133 }
134
135 idx = header->prod & (ring->n_elements - 1);
136 elt = ring->ring->elements + idx * ring->element_size;
137
138 memcpy((void *)elt, new_elt, ring->element_size);
139
140 header->prod++;
141
142 mb();
143
144 if (header->prod == header->notify_on_prod)
145 outb(value: 0, port: ring->prod_notify);
146
147 spin_unlock_irqrestore(lock: &ring->lock, flags);
148 return 0;
149}
150
151static bool qxl_ring_pop(struct qxl_ring *ring,
152 void *element)
153{
154 volatile struct qxl_ring_header *header = &(ring->ring->header);
155 volatile uint8_t *ring_elt;
156 int idx;
157 unsigned long flags;
158
159 spin_lock_irqsave(&ring->lock, flags);
160 if (header->cons == header->prod) {
161 header->notify_on_prod = header->cons + 1;
162 spin_unlock_irqrestore(lock: &ring->lock, flags);
163 return false;
164 }
165
166 idx = header->cons & (ring->n_elements - 1);
167 ring_elt = ring->ring->elements + idx * ring->element_size;
168
169 memcpy(element, (void *)ring_elt, ring->element_size);
170
171 header->cons++;
172
173 spin_unlock_irqrestore(lock: &ring->lock, flags);
174 return true;
175}
176
177int
178qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *release,
179 uint32_t type, bool interruptible)
180{
181 struct qxl_command cmd;
182
183 cmd.type = type;
184 cmd.data = qxl_bo_physical_address(qdev, bo: release->release_bo, offset: release->release_offset);
185
186 return qxl_ring_push(ring: qdev->command_ring, new_elt: &cmd, interruptible);
187}
188
189int
190qxl_push_cursor_ring_release(struct qxl_device *qdev, struct qxl_release *release,
191 uint32_t type, bool interruptible)
192{
193 struct qxl_command cmd;
194
195 cmd.type = type;
196 cmd.data = qxl_bo_physical_address(qdev, bo: release->release_bo, offset: release->release_offset);
197
198 return qxl_ring_push(ring: qdev->cursor_ring, new_elt: &cmd, interruptible);
199}
200
201bool qxl_queue_garbage_collect(struct qxl_device *qdev, bool flush)
202{
203 if (!qxl_check_idle(ring: qdev->release_ring)) {
204 schedule_work(work: &qdev->gc_work);
205 if (flush)
206 flush_work(work: &qdev->gc_work);
207 return true;
208 }
209 return false;
210}
211
212int qxl_garbage_collect(struct qxl_device *qdev)
213{
214 struct qxl_release *release;
215 uint64_t id, next_id;
216 int i = 0;
217 union qxl_release_info *info;
218
219 while (qxl_ring_pop(ring: qdev->release_ring, element: &id)) {
220 DRM_DEBUG_DRIVER("popped %lld\n", id);
221 while (id) {
222 release = qxl_release_from_id_locked(qdev, id);
223 if (release == NULL)
224 break;
225
226 info = qxl_release_map(qdev, release);
227 next_id = info->next;
228 qxl_release_unmap(qdev, release, info);
229
230 DRM_DEBUG_DRIVER("popped %lld, next %lld\n", id,
231 next_id);
232
233 switch (release->type) {
234 case QXL_RELEASE_DRAWABLE:
235 case QXL_RELEASE_SURFACE_CMD:
236 case QXL_RELEASE_CURSOR_CMD:
237 break;
238 default:
239 DRM_ERROR("unexpected release type\n");
240 break;
241 }
242 id = next_id;
243
244 qxl_release_free(qdev, release);
245 ++i;
246 }
247 }
248
249 wake_up_all(&qdev->release_event);
250 DRM_DEBUG_DRIVER("%d\n", i);
251
252 return i;
253}
254
255int qxl_alloc_bo_reserved(struct qxl_device *qdev,
256 struct qxl_release *release,
257 unsigned long size,
258 struct qxl_bo **_bo)
259{
260 struct qxl_bo *bo;
261 int ret;
262
263 ret = qxl_bo_create(qdev, size, kernel: false /* not kernel - device */,
264 pinned: false, QXL_GEM_DOMAIN_VRAM, priority: 0, NULL, bo_ptr: &bo);
265 if (ret) {
266 DRM_ERROR("failed to allocate VRAM BO\n");
267 return ret;
268 }
269 ret = qxl_release_list_add(release, bo);
270 if (ret)
271 goto out_unref;
272
273 *_bo = bo;
274 return 0;
275out_unref:
276 qxl_bo_unref(bo: &bo);
277 return ret;
278}
279
280static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port, bool intr)
281{
282 int irq_num;
283 long addr = qdev->io_base + port;
284 int ret;
285
286 mutex_lock(&qdev->async_io_mutex);
287 irq_num = atomic_read(v: &qdev->irq_received_io_cmd);
288 if (qdev->last_sent_io_cmd > irq_num) {
289 if (intr)
290 ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
291 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
292 else
293 ret = wait_event_timeout(qdev->io_cmd_event,
294 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
295 /* 0 is timeout, just bail the "hw" has gone away */
296 if (ret <= 0)
297 goto out;
298 irq_num = atomic_read(v: &qdev->irq_received_io_cmd);
299 }
300 outb(value: val, port: addr);
301 qdev->last_sent_io_cmd = irq_num + 1;
302 if (intr)
303 ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
304 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
305 else
306 ret = wait_event_timeout(qdev->io_cmd_event,
307 atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
308out:
309 if (ret > 0)
310 ret = 0;
311 mutex_unlock(lock: &qdev->async_io_mutex);
312 return ret;
313}
314
315static void wait_for_io_cmd(struct qxl_device *qdev, uint8_t val, long port)
316{
317 int ret;
318
319restart:
320 ret = wait_for_io_cmd_user(qdev, val, port, intr: false);
321 if (ret == -ERESTARTSYS)
322 goto restart;
323}
324
325int qxl_io_update_area(struct qxl_device *qdev, struct qxl_bo *surf,
326 const struct qxl_rect *area)
327{
328 int surface_id;
329 uint32_t surface_width, surface_height;
330 int ret;
331
332 if (!surf->hw_surf_alloc)
333 DRM_ERROR("got io update area with no hw surface\n");
334
335 if (surf->is_primary)
336 surface_id = 0;
337 else
338 surface_id = surf->surface_id;
339 surface_width = surf->surf.width;
340 surface_height = surf->surf.height;
341
342 if (area->left < 0 || area->top < 0 ||
343 area->right > surface_width || area->bottom > surface_height)
344 return -EINVAL;
345
346 mutex_lock(&qdev->update_area_mutex);
347 qdev->ram_header->update_area = *area;
348 qdev->ram_header->update_surface = surface_id;
349 ret = wait_for_io_cmd_user(qdev, val: 0, port: QXL_IO_UPDATE_AREA_ASYNC, intr: true);
350 mutex_unlock(lock: &qdev->update_area_mutex);
351 return ret;
352}
353
354void qxl_io_notify_oom(struct qxl_device *qdev)
355{
356 outb(value: 0, port: qdev->io_base + QXL_IO_NOTIFY_OOM);
357}
358
359void qxl_io_flush_release(struct qxl_device *qdev)
360{
361 outb(value: 0, port: qdev->io_base + QXL_IO_FLUSH_RELEASE);
362}
363
364void qxl_io_flush_surfaces(struct qxl_device *qdev)
365{
366 wait_for_io_cmd(qdev, val: 0, port: QXL_IO_FLUSH_SURFACES_ASYNC);
367}
368
369void qxl_io_destroy_primary(struct qxl_device *qdev)
370{
371 wait_for_io_cmd(qdev, val: 0, port: QXL_IO_DESTROY_PRIMARY_ASYNC);
372 qdev->primary_bo->is_primary = false;
373 drm_gem_object_put(obj: &qdev->primary_bo->tbo.base);
374 qdev->primary_bo = NULL;
375}
376
377void qxl_io_create_primary(struct qxl_device *qdev, struct qxl_bo *bo)
378{
379 struct qxl_surface_create *create;
380
381 if (WARN_ON(qdev->primary_bo))
382 return;
383
384 DRM_DEBUG_DRIVER("qdev %p, ram_header %p\n", qdev, qdev->ram_header);
385 create = &qdev->ram_header->create_surface;
386 create->format = bo->surf.format;
387 create->width = bo->surf.width;
388 create->height = bo->surf.height;
389 create->stride = bo->surf.stride;
390 create->mem = qxl_bo_physical_address(qdev, bo, offset: 0);
391
392 DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr);
393
394 create->flags = QXL_SURF_FLAG_KEEP_DATA;
395 create->type = QXL_SURF_TYPE_PRIMARY;
396
397 wait_for_io_cmd(qdev, val: 0, port: QXL_IO_CREATE_PRIMARY_ASYNC);
398 qdev->primary_bo = bo;
399 qdev->primary_bo->is_primary = true;
400 drm_gem_object_get(obj: &qdev->primary_bo->tbo.base);
401}
402
403void qxl_io_memslot_add(struct qxl_device *qdev, uint8_t id)
404{
405 DRM_DEBUG_DRIVER("qxl_memslot_add %d\n", id);
406 wait_for_io_cmd(qdev, val: id, port: QXL_IO_MEMSLOT_ADD_ASYNC);
407}
408
409void qxl_io_reset(struct qxl_device *qdev)
410{
411 outb(value: 0, port: qdev->io_base + QXL_IO_RESET);
412}
413
414void qxl_io_monitors_config(struct qxl_device *qdev)
415{
416 wait_for_io_cmd(qdev, val: 0, port: QXL_IO_MONITORS_CONFIG_ASYNC);
417}
418
419int qxl_surface_id_alloc(struct qxl_device *qdev,
420 struct qxl_bo *surf)
421{
422 uint32_t handle;
423 int idr_ret;
424again:
425 idr_preload(GFP_ATOMIC);
426 spin_lock(lock: &qdev->surf_id_idr_lock);
427 idr_ret = idr_alloc(&qdev->surf_id_idr, NULL, start: 1, end: 0, GFP_NOWAIT);
428 spin_unlock(lock: &qdev->surf_id_idr_lock);
429 idr_preload_end();
430 if (idr_ret < 0)
431 return idr_ret;
432 handle = idr_ret;
433
434 if (handle >= qdev->rom->n_surfaces) {
435 spin_lock(lock: &qdev->surf_id_idr_lock);
436 idr_remove(&qdev->surf_id_idr, id: handle);
437 spin_unlock(lock: &qdev->surf_id_idr_lock);
438 qxl_reap_surface_id(qdev, max_to_reap: 2);
439 goto again;
440 }
441 surf->surface_id = handle;
442
443 spin_lock(lock: &qdev->surf_id_idr_lock);
444 qdev->last_alloced_surf_id = handle;
445 spin_unlock(lock: &qdev->surf_id_idr_lock);
446 return 0;
447}
448
449void qxl_surface_id_dealloc(struct qxl_device *qdev,
450 uint32_t surface_id)
451{
452 spin_lock(lock: &qdev->surf_id_idr_lock);
453 idr_remove(&qdev->surf_id_idr, id: surface_id);
454 spin_unlock(lock: &qdev->surf_id_idr_lock);
455}
456
457int qxl_hw_surface_alloc(struct qxl_device *qdev,
458 struct qxl_bo *surf)
459{
460 struct qxl_surface_cmd *cmd;
461 struct qxl_release *release;
462 int ret;
463
464 if (surf->hw_surf_alloc)
465 return 0;
466
467 ret = qxl_alloc_surface_release_reserved(qdev, surface_cmd_type: QXL_SURFACE_CMD_CREATE,
468 NULL,
469 release: &release);
470 if (ret)
471 return ret;
472
473 ret = qxl_release_reserve_list(release, no_intr: true);
474 if (ret) {
475 qxl_release_free(qdev, release);
476 return ret;
477 }
478 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release);
479 cmd->type = QXL_SURFACE_CMD_CREATE;
480 cmd->flags = QXL_SURF_FLAG_KEEP_DATA;
481 cmd->u.surface_create.format = surf->surf.format;
482 cmd->u.surface_create.width = surf->surf.width;
483 cmd->u.surface_create.height = surf->surf.height;
484 cmd->u.surface_create.stride = surf->surf.stride;
485 cmd->u.surface_create.data = qxl_bo_physical_address(qdev, bo: surf, offset: 0);
486 cmd->surface_id = surf->surface_id;
487 qxl_release_unmap(qdev, release, info: &cmd->release_info);
488
489 surf->surf_create = release;
490
491 /* no need to add a release to the fence for this surface bo,
492 since it is only released when we ask to destroy the surface
493 and it would never signal otherwise */
494 qxl_release_fence_buffer_objects(release);
495 qxl_push_command_ring_release(qdev, release, type: QXL_CMD_SURFACE, interruptible: false);
496
497 surf->hw_surf_alloc = true;
498 spin_lock(lock: &qdev->surf_id_idr_lock);
499 idr_replace(&qdev->surf_id_idr, surf, id: surf->surface_id);
500 spin_unlock(lock: &qdev->surf_id_idr_lock);
501 return 0;
502}
503
504int qxl_hw_surface_dealloc(struct qxl_device *qdev,
505 struct qxl_bo *surf)
506{
507 struct qxl_surface_cmd *cmd;
508 struct qxl_release *release;
509 int ret;
510 int id;
511
512 if (!surf->hw_surf_alloc)
513 return 0;
514
515 ret = qxl_alloc_surface_release_reserved(qdev, surface_cmd_type: QXL_SURFACE_CMD_DESTROY,
516 create_rel: surf->surf_create,
517 release: &release);
518 if (ret)
519 return ret;
520
521 surf->surf_create = NULL;
522 /* remove the surface from the idr, but not the surface id yet */
523 spin_lock(lock: &qdev->surf_id_idr_lock);
524 idr_replace(&qdev->surf_id_idr, NULL, id: surf->surface_id);
525 spin_unlock(lock: &qdev->surf_id_idr_lock);
526 surf->hw_surf_alloc = false;
527
528 id = surf->surface_id;
529 surf->surface_id = 0;
530
531 release->surface_release_id = id;
532 cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release);
533 cmd->type = QXL_SURFACE_CMD_DESTROY;
534 cmd->surface_id = id;
535 qxl_release_unmap(qdev, release, info: &cmd->release_info);
536
537 qxl_release_fence_buffer_objects(release);
538 qxl_push_command_ring_release(qdev, release, type: QXL_CMD_SURFACE, interruptible: false);
539
540 return 0;
541}
542
543static int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf)
544{
545 struct qxl_rect rect;
546 int ret;
547
548 /* if we are evicting, we need to make sure the surface is up
549 to date */
550 rect.left = 0;
551 rect.right = surf->surf.width;
552 rect.top = 0;
553 rect.bottom = surf->surf.height;
554retry:
555 ret = qxl_io_update_area(qdev, surf, area: &rect);
556 if (ret == -ERESTARTSYS)
557 goto retry;
558 return ret;
559}
560
561static void qxl_surface_evict_locked(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area)
562{
563 /* no need to update area if we are just freeing the surface normally */
564 if (do_update_area)
565 qxl_update_surface(qdev, surf);
566
567 /* nuke the surface id at the hw */
568 qxl_hw_surface_dealloc(qdev, surf);
569}
570
571void qxl_surface_evict(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area)
572{
573 mutex_lock(&qdev->surf_evict_mutex);
574 qxl_surface_evict_locked(qdev, surf, do_update_area);
575 mutex_unlock(lock: &qdev->surf_evict_mutex);
576}
577
578static int qxl_reap_surf(struct qxl_device *qdev, struct qxl_bo *surf, bool stall)
579{
580 long ret;
581
582 ret = qxl_bo_reserve(bo: surf);
583 if (ret)
584 return ret;
585
586 if (stall)
587 mutex_unlock(lock: &qdev->surf_evict_mutex);
588
589 if (stall) {
590 ret = dma_resv_wait_timeout(obj: surf->tbo.base.resv,
591 usage: DMA_RESV_USAGE_BOOKKEEP, intr: true,
592 timeout: 15 * HZ);
593 if (ret > 0)
594 ret = 0;
595 else if (ret == 0)
596 ret = -EBUSY;
597 } else {
598 ret = dma_resv_test_signaled(obj: surf->tbo.base.resv,
599 usage: DMA_RESV_USAGE_BOOKKEEP);
600 ret = ret ? -EBUSY : 0;
601 }
602
603 if (stall)
604 mutex_lock(&qdev->surf_evict_mutex);
605 if (ret) {
606 qxl_bo_unreserve(bo: surf);
607 return ret;
608 }
609
610 qxl_surface_evict_locked(qdev, surf, do_update_area: true);
611 qxl_bo_unreserve(bo: surf);
612 return 0;
613}
614
615static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap)
616{
617 int num_reaped = 0;
618 int i, ret;
619 bool stall = false;
620 int start = 0;
621
622 mutex_lock(&qdev->surf_evict_mutex);
623again:
624
625 spin_lock(lock: &qdev->surf_id_idr_lock);
626 start = qdev->last_alloced_surf_id + 1;
627 spin_unlock(lock: &qdev->surf_id_idr_lock);
628
629 for (i = start; i < start + qdev->rom->n_surfaces; i++) {
630 void *objptr;
631 int surfid = i % qdev->rom->n_surfaces;
632
633 /* this avoids the case where the objects is in the
634 idr but has been evicted half way - its makes
635 the idr lookup atomic with the eviction */
636 spin_lock(lock: &qdev->surf_id_idr_lock);
637 objptr = idr_find(&qdev->surf_id_idr, id: surfid);
638 spin_unlock(lock: &qdev->surf_id_idr_lock);
639
640 if (!objptr)
641 continue;
642
643 ret = qxl_reap_surf(qdev, surf: objptr, stall);
644 if (ret == 0)
645 num_reaped++;
646 if (num_reaped >= max_to_reap)
647 break;
648 }
649 if (num_reaped == 0 && stall == false) {
650 stall = true;
651 goto again;
652 }
653
654 mutex_unlock(lock: &qdev->surf_evict_mutex);
655 if (num_reaped) {
656 usleep_range(min: 500, max: 1000);
657 qxl_queue_garbage_collect(qdev, flush: true);
658 }
659
660 return 0;
661}
662

source code of linux/drivers/gpu/drm/qxl/qxl_cmd.c