1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2009-2023 VMware, Inc., Palo Alto, CA., USA
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/ttm/ttm_placement.h>
29
30#include "vmwgfx_binding.h"
31#include "vmwgfx_bo.h"
32#include "vmwgfx_drv.h"
33#include "vmwgfx_resource_priv.h"
34
35#define VMW_RES_EVICT_ERR_COUNT 10
36
37/**
38 * vmw_resource_mob_attach - Mark a resource as attached to its backing mob
39 * @res: The resource
40 */
41void vmw_resource_mob_attach(struct vmw_resource *res)
42{
43 struct vmw_bo *gbo = res->guest_memory_bo;
44 struct rb_node **new = &gbo->res_tree.rb_node, *parent = NULL;
45
46 dma_resv_assert_held(gbo->tbo.base.resv);
47 res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
48 res->func->prio;
49
50 while (*new) {
51 struct vmw_resource *this =
52 container_of(*new, struct vmw_resource, mob_node);
53
54 parent = *new;
55 new = (res->guest_memory_offset < this->guest_memory_offset) ?
56 &((*new)->rb_left) : &((*new)->rb_right);
57 }
58
59 rb_link_node(node: &res->mob_node, parent, rb_link: new);
60 rb_insert_color(&res->mob_node, &gbo->res_tree);
61
62 vmw_bo_prio_add(vbo: gbo, prio: res->used_prio);
63}
64
65/**
66 * vmw_resource_mob_detach - Mark a resource as detached from its backing mob
67 * @res: The resource
68 */
69void vmw_resource_mob_detach(struct vmw_resource *res)
70{
71 struct vmw_bo *gbo = res->guest_memory_bo;
72
73 dma_resv_assert_held(gbo->tbo.base.resv);
74 if (vmw_resource_mob_attached(res)) {
75 rb_erase(&res->mob_node, &gbo->res_tree);
76 RB_CLEAR_NODE(&res->mob_node);
77 vmw_bo_prio_del(vbo: gbo, prio: res->used_prio);
78 }
79}
80
81struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
82{
83 kref_get(kref: &res->kref);
84 return res;
85}
86
87struct vmw_resource *
88vmw_resource_reference_unless_doomed(struct vmw_resource *res)
89{
90 return kref_get_unless_zero(kref: &res->kref) ? res : NULL;
91}
92
93/**
94 * vmw_resource_release_id - release a resource id to the id manager.
95 *
96 * @res: Pointer to the resource.
97 *
98 * Release the resource id to the resource id manager and set it to -1
99 */
100void vmw_resource_release_id(struct vmw_resource *res)
101{
102 struct vmw_private *dev_priv = res->dev_priv;
103 struct idr *idr = &dev_priv->res_idr[res->func->res_type];
104
105 spin_lock(lock: &dev_priv->resource_lock);
106 if (res->id != -1)
107 idr_remove(idr, id: res->id);
108 res->id = -1;
109 spin_unlock(lock: &dev_priv->resource_lock);
110}
111
112static void vmw_resource_release(struct kref *kref)
113{
114 struct vmw_resource *res =
115 container_of(kref, struct vmw_resource, kref);
116 struct vmw_private *dev_priv = res->dev_priv;
117 int id;
118 int ret;
119 struct idr *idr = &dev_priv->res_idr[res->func->res_type];
120
121 spin_lock(lock: &dev_priv->resource_lock);
122 list_del_init(entry: &res->lru_head);
123 spin_unlock(lock: &dev_priv->resource_lock);
124 if (res->guest_memory_bo) {
125 struct ttm_buffer_object *bo = &res->guest_memory_bo->tbo;
126
127 ret = ttm_bo_reserve(bo, interruptible: false, no_wait: false, NULL);
128 BUG_ON(ret);
129 if (vmw_resource_mob_attached(res) &&
130 res->func->unbind != NULL) {
131 struct ttm_validate_buffer val_buf;
132
133 val_buf.bo = bo;
134 val_buf.num_shared = 0;
135 res->func->unbind(res, false, &val_buf);
136 }
137 res->guest_memory_size = false;
138 vmw_resource_mob_detach(res);
139 if (res->dirty)
140 res->func->dirty_free(res);
141 if (res->coherent)
142 vmw_bo_dirty_release(vbo: res->guest_memory_bo);
143 ttm_bo_unreserve(bo);
144 vmw_user_bo_unref(buf: &res->guest_memory_bo);
145 }
146
147 if (likely(res->hw_destroy != NULL)) {
148 mutex_lock(&dev_priv->binding_mutex);
149 vmw_binding_res_list_kill(head: &res->binding_head);
150 mutex_unlock(lock: &dev_priv->binding_mutex);
151 res->hw_destroy(res);
152 }
153
154 id = res->id;
155 if (res->res_free != NULL)
156 res->res_free(res);
157 else
158 kfree(objp: res);
159
160 spin_lock(lock: &dev_priv->resource_lock);
161 if (id != -1)
162 idr_remove(idr, id);
163 spin_unlock(lock: &dev_priv->resource_lock);
164}
165
166void vmw_resource_unreference(struct vmw_resource **p_res)
167{
168 struct vmw_resource *res = *p_res;
169
170 *p_res = NULL;
171 kref_put(kref: &res->kref, release: vmw_resource_release);
172}
173
174
175/**
176 * vmw_resource_alloc_id - release a resource id to the id manager.
177 *
178 * @res: Pointer to the resource.
179 *
180 * Allocate the lowest free resource from the resource manager, and set
181 * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
182 */
183int vmw_resource_alloc_id(struct vmw_resource *res)
184{
185 struct vmw_private *dev_priv = res->dev_priv;
186 int ret;
187 struct idr *idr = &dev_priv->res_idr[res->func->res_type];
188
189 BUG_ON(res->id != -1);
190
191 idr_preload(GFP_KERNEL);
192 spin_lock(lock: &dev_priv->resource_lock);
193
194 ret = idr_alloc(idr, ptr: res, start: 1, end: 0, GFP_NOWAIT);
195 if (ret >= 0)
196 res->id = ret;
197
198 spin_unlock(lock: &dev_priv->resource_lock);
199 idr_preload_end();
200 return ret < 0 ? ret : 0;
201}
202
203/**
204 * vmw_resource_init - initialize a struct vmw_resource
205 *
206 * @dev_priv: Pointer to a device private struct.
207 * @res: The struct vmw_resource to initialize.
208 * @delay_id: Boolean whether to defer device id allocation until
209 * the first validation.
210 * @res_free: Resource destructor.
211 * @func: Resource function table.
212 */
213int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
214 bool delay_id,
215 void (*res_free) (struct vmw_resource *res),
216 const struct vmw_res_func *func)
217{
218 kref_init(kref: &res->kref);
219 res->hw_destroy = NULL;
220 res->res_free = res_free;
221 res->dev_priv = dev_priv;
222 res->func = func;
223 RB_CLEAR_NODE(&res->mob_node);
224 INIT_LIST_HEAD(list: &res->lru_head);
225 INIT_LIST_HEAD(list: &res->binding_head);
226 res->id = -1;
227 res->guest_memory_bo = NULL;
228 res->guest_memory_offset = 0;
229 res->guest_memory_dirty = false;
230 res->res_dirty = false;
231 res->coherent = false;
232 res->used_prio = 3;
233 res->dirty = NULL;
234 if (delay_id)
235 return 0;
236 else
237 return vmw_resource_alloc_id(res);
238}
239
240
241/**
242 * vmw_user_resource_lookup_handle - lookup a struct resource from a
243 * TTM user-space handle and perform basic type checks
244 *
245 * @dev_priv: Pointer to a device private struct
246 * @tfile: Pointer to a struct ttm_object_file identifying the caller
247 * @handle: The TTM user-space handle
248 * @converter: Pointer to an object describing the resource type
249 * @p_res: On successful return the location pointed to will contain
250 * a pointer to a refcounted struct vmw_resource.
251 *
252 * If the handle can't be found or is associated with an incorrect resource
253 * type, -EINVAL will be returned.
254 */
255int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
256 struct ttm_object_file *tfile,
257 uint32_t handle,
258 const struct vmw_user_resource_conv
259 *converter,
260 struct vmw_resource **p_res)
261{
262 struct ttm_base_object *base;
263 struct vmw_resource *res;
264 int ret = -EINVAL;
265
266 base = ttm_base_object_lookup(tfile, key: handle);
267 if (unlikely(!base))
268 return -EINVAL;
269
270 if (unlikely(ttm_base_object_type(base) != converter->object_type))
271 goto out_bad_resource;
272
273 res = converter->base_obj_to_res(base);
274 kref_get(kref: &res->kref);
275
276 *p_res = res;
277 ret = 0;
278
279out_bad_resource:
280 ttm_base_object_unref(p_base: &base);
281
282 return ret;
283}
284
285/*
286 * Helper function that looks either a surface or bo.
287 *
288 * The pointer this pointed at by out_surf and out_buf needs to be null.
289 */
290int vmw_user_lookup_handle(struct vmw_private *dev_priv,
291 struct drm_file *filp,
292 uint32_t handle,
293 struct vmw_surface **out_surf,
294 struct vmw_bo **out_buf)
295{
296 struct ttm_object_file *tfile = vmw_fpriv(file_priv: filp)->tfile;
297 struct vmw_resource *res;
298 int ret;
299
300 BUG_ON(*out_surf || *out_buf);
301
302 ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
303 converter: user_surface_converter,
304 p_res: &res);
305 if (!ret) {
306 *out_surf = vmw_res_to_srf(res);
307 return 0;
308 }
309
310 *out_surf = NULL;
311 ret = vmw_user_bo_lookup(filp, handle, out: out_buf);
312 return ret;
313}
314
315/**
316 * vmw_resource_buf_alloc - Allocate a guest memory buffer for a resource.
317 *
318 * @res: The resource for which to allocate a gbo buffer.
319 * @interruptible: Whether any sleeps during allocation should be
320 * performed while interruptible.
321 */
322static int vmw_resource_buf_alloc(struct vmw_resource *res,
323 bool interruptible)
324{
325 unsigned long size = PFN_ALIGN(res->guest_memory_size);
326 struct vmw_bo *gbo;
327 struct vmw_bo_params bo_params = {
328 .domain = res->func->domain,
329 .busy_domain = res->func->busy_domain,
330 .bo_type = ttm_bo_type_device,
331 .size = res->guest_memory_size,
332 .pin = false
333 };
334 int ret;
335
336 if (likely(res->guest_memory_bo)) {
337 BUG_ON(res->guest_memory_bo->tbo.base.size < size);
338 return 0;
339 }
340
341 ret = vmw_gem_object_create(vmw: res->dev_priv, params: &bo_params, p_vbo: &gbo);
342 if (unlikely(ret != 0))
343 goto out_no_bo;
344
345 res->guest_memory_bo = gbo;
346
347out_no_bo:
348 return ret;
349}
350
351/**
352 * vmw_resource_do_validate - Make a resource up-to-date and visible
353 * to the device.
354 *
355 * @res: The resource to make visible to the device.
356 * @val_buf: Information about a buffer possibly
357 * containing backup data if a bind operation is needed.
358 * @dirtying: Transfer dirty regions.
359 *
360 * On hardware resource shortage, this function returns -EBUSY and
361 * should be retried once resources have been freed up.
362 */
363static int vmw_resource_do_validate(struct vmw_resource *res,
364 struct ttm_validate_buffer *val_buf,
365 bool dirtying)
366{
367 int ret = 0;
368 const struct vmw_res_func *func = res->func;
369
370 if (unlikely(res->id == -1)) {
371 ret = func->create(res);
372 if (unlikely(ret != 0))
373 return ret;
374 }
375
376 if (func->bind &&
377 ((func->needs_guest_memory && !vmw_resource_mob_attached(res) &&
378 val_buf->bo) ||
379 (!func->needs_guest_memory && val_buf->bo))) {
380 ret = func->bind(res, val_buf);
381 if (unlikely(ret != 0))
382 goto out_bind_failed;
383 if (func->needs_guest_memory)
384 vmw_resource_mob_attach(res);
385 }
386
387 /*
388 * Handle the case where the backup mob is marked coherent but
389 * the resource isn't.
390 */
391 if (func->dirty_alloc && vmw_resource_mob_attached(res) &&
392 !res->coherent) {
393 if (res->guest_memory_bo->dirty && !res->dirty) {
394 ret = func->dirty_alloc(res);
395 if (ret)
396 return ret;
397 } else if (!res->guest_memory_bo->dirty && res->dirty) {
398 func->dirty_free(res);
399 }
400 }
401
402 /*
403 * Transfer the dirty regions to the resource and update
404 * the resource.
405 */
406 if (res->dirty) {
407 if (dirtying && !res->res_dirty) {
408 pgoff_t start = res->guest_memory_offset >> PAGE_SHIFT;
409 pgoff_t end = __KERNEL_DIV_ROUND_UP
410 (res->guest_memory_offset + res->guest_memory_size,
411 PAGE_SIZE);
412
413 vmw_bo_dirty_unmap(vbo: res->guest_memory_bo, start, end);
414 }
415
416 vmw_bo_dirty_transfer_to_res(res);
417 return func->dirty_sync(res);
418 }
419
420 return 0;
421
422out_bind_failed:
423 func->destroy(res);
424
425 return ret;
426}
427
428/**
429 * vmw_resource_unreserve - Unreserve a resource previously reserved for
430 * command submission.
431 *
432 * @res: Pointer to the struct vmw_resource to unreserve.
433 * @dirty_set: Change dirty status of the resource.
434 * @dirty: When changing dirty status indicates the new status.
435 * @switch_guest_memory: Guest memory buffer has been switched.
436 * @new_guest_memory_bo: Pointer to new guest memory buffer if command submission
437 * switched. May be NULL.
438 * @new_guest_memory_offset: New gbo offset if @switch_guest_memory is true.
439 *
440 * Currently unreserving a resource means putting it back on the device's
441 * resource lru list, so that it can be evicted if necessary.
442 */
443void vmw_resource_unreserve(struct vmw_resource *res,
444 bool dirty_set,
445 bool dirty,
446 bool switch_guest_memory,
447 struct vmw_bo *new_guest_memory_bo,
448 unsigned long new_guest_memory_offset)
449{
450 struct vmw_private *dev_priv = res->dev_priv;
451
452 if (!list_empty(head: &res->lru_head))
453 return;
454
455 if (switch_guest_memory && new_guest_memory_bo != res->guest_memory_bo) {
456 if (res->guest_memory_bo) {
457 vmw_resource_mob_detach(res);
458 if (res->coherent)
459 vmw_bo_dirty_release(vbo: res->guest_memory_bo);
460 vmw_user_bo_unref(buf: &res->guest_memory_bo);
461 }
462
463 if (new_guest_memory_bo) {
464 res->guest_memory_bo = vmw_user_bo_ref(vbo: new_guest_memory_bo);
465
466 /*
467 * The validation code should already have added a
468 * dirty tracker here.
469 */
470 WARN_ON(res->coherent && !new_guest_memory_bo->dirty);
471
472 vmw_resource_mob_attach(res);
473 } else {
474 res->guest_memory_bo = NULL;
475 }
476 } else if (switch_guest_memory && res->coherent) {
477 vmw_bo_dirty_release(vbo: res->guest_memory_bo);
478 }
479
480 if (switch_guest_memory)
481 res->guest_memory_offset = new_guest_memory_offset;
482
483 if (dirty_set)
484 res->res_dirty = dirty;
485
486 if (!res->func->may_evict || res->id == -1 || res->pin_count)
487 return;
488
489 spin_lock(lock: &dev_priv->resource_lock);
490 list_add_tail(new: &res->lru_head,
491 head: &res->dev_priv->res_lru[res->func->res_type]);
492 spin_unlock(lock: &dev_priv->resource_lock);
493}
494
495/**
496 * vmw_resource_check_buffer - Check whether a backup buffer is needed
497 * for a resource and in that case, allocate
498 * one, reserve and validate it.
499 *
500 * @ticket: The ww acquire context to use, or NULL if trylocking.
501 * @res: The resource for which to allocate a backup buffer.
502 * @interruptible: Whether any sleeps during allocation should be
503 * performed while interruptible.
504 * @val_buf: On successful return contains data about the
505 * reserved and validated backup buffer.
506 */
507static int
508vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
509 struct vmw_resource *res,
510 bool interruptible,
511 struct ttm_validate_buffer *val_buf)
512{
513 struct ttm_operation_ctx ctx = { true, false };
514 struct list_head val_list;
515 bool guest_memory_dirty = false;
516 int ret;
517
518 if (unlikely(!res->guest_memory_bo)) {
519 ret = vmw_resource_buf_alloc(res, interruptible);
520 if (unlikely(ret != 0))
521 return ret;
522 }
523
524 INIT_LIST_HEAD(list: &val_list);
525 ttm_bo_get(bo: &res->guest_memory_bo->tbo);
526 val_buf->bo = &res->guest_memory_bo->tbo;
527 val_buf->num_shared = 0;
528 list_add_tail(new: &val_buf->head, head: &val_list);
529 ret = ttm_eu_reserve_buffers(ticket, list: &val_list, intr: interruptible, NULL);
530 if (unlikely(ret != 0))
531 goto out_no_reserve;
532
533 if (res->func->needs_guest_memory && !vmw_resource_mob_attached(res))
534 return 0;
535
536 guest_memory_dirty = res->guest_memory_dirty;
537 vmw_bo_placement_set(bo: res->guest_memory_bo, domain: res->func->domain,
538 busy_domain: res->func->busy_domain);
539 ret = ttm_bo_validate(bo: &res->guest_memory_bo->tbo,
540 placement: &res->guest_memory_bo->placement,
541 ctx: &ctx);
542
543 if (unlikely(ret != 0))
544 goto out_no_validate;
545
546 return 0;
547
548out_no_validate:
549 ttm_eu_backoff_reservation(ticket, list: &val_list);
550out_no_reserve:
551 ttm_bo_put(bo: val_buf->bo);
552 val_buf->bo = NULL;
553 if (guest_memory_dirty)
554 vmw_user_bo_unref(buf: &res->guest_memory_bo);
555
556 return ret;
557}
558
559/*
560 * vmw_resource_reserve - Reserve a resource for command submission
561 *
562 * @res: The resource to reserve.
563 *
564 * This function takes the resource off the LRU list and make sure
565 * a guest memory buffer is present for guest-backed resources.
566 * However, the buffer may not be bound to the resource at this
567 * point.
568 *
569 */
570int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
571 bool no_guest_memory)
572{
573 struct vmw_private *dev_priv = res->dev_priv;
574 int ret;
575
576 spin_lock(lock: &dev_priv->resource_lock);
577 list_del_init(entry: &res->lru_head);
578 spin_unlock(lock: &dev_priv->resource_lock);
579
580 if (res->func->needs_guest_memory && !res->guest_memory_bo &&
581 !no_guest_memory) {
582 ret = vmw_resource_buf_alloc(res, interruptible);
583 if (unlikely(ret != 0)) {
584 DRM_ERROR("Failed to allocate a guest memory buffer "
585 "of size %lu. bytes\n",
586 (unsigned long) res->guest_memory_size);
587 return ret;
588 }
589 }
590
591 return 0;
592}
593
594/**
595 * vmw_resource_backoff_reservation - Unreserve and unreference a
596 * guest memory buffer
597 *.
598 * @ticket: The ww acquire ctx used for reservation.
599 * @val_buf: Guest memory buffer information.
600 */
601static void
602vmw_resource_backoff_reservation(struct ww_acquire_ctx *ticket,
603 struct ttm_validate_buffer *val_buf)
604{
605 struct list_head val_list;
606
607 if (likely(val_buf->bo == NULL))
608 return;
609
610 INIT_LIST_HEAD(list: &val_list);
611 list_add_tail(new: &val_buf->head, head: &val_list);
612 ttm_eu_backoff_reservation(ticket, list: &val_list);
613 ttm_bo_put(bo: val_buf->bo);
614 val_buf->bo = NULL;
615}
616
617/**
618 * vmw_resource_do_evict - Evict a resource, and transfer its data
619 * to a backup buffer.
620 *
621 * @ticket: The ww acquire ticket to use, or NULL if trylocking.
622 * @res: The resource to evict.
623 * @interruptible: Whether to wait interruptible.
624 */
625static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket,
626 struct vmw_resource *res, bool interruptible)
627{
628 struct ttm_validate_buffer val_buf;
629 const struct vmw_res_func *func = res->func;
630 int ret;
631
632 BUG_ON(!func->may_evict);
633
634 val_buf.bo = NULL;
635 val_buf.num_shared = 0;
636 ret = vmw_resource_check_buffer(ticket, res, interruptible, val_buf: &val_buf);
637 if (unlikely(ret != 0))
638 return ret;
639
640 if (unlikely(func->unbind != NULL &&
641 (!func->needs_guest_memory || vmw_resource_mob_attached(res)))) {
642 ret = func->unbind(res, res->res_dirty, &val_buf);
643 if (unlikely(ret != 0))
644 goto out_no_unbind;
645 vmw_resource_mob_detach(res);
646 }
647 ret = func->destroy(res);
648 res->guest_memory_dirty = true;
649 res->res_dirty = false;
650out_no_unbind:
651 vmw_resource_backoff_reservation(ticket, val_buf: &val_buf);
652
653 return ret;
654}
655
656
657/**
658 * vmw_resource_validate - Make a resource up-to-date and visible
659 * to the device.
660 * @res: The resource to make visible to the device.
661 * @intr: Perform waits interruptible if possible.
662 * @dirtying: Pending GPU operation will dirty the resource
663 *
664 * On successful return, any backup DMA buffer pointed to by @res->backup will
665 * be reserved and validated.
666 * On hardware resource shortage, this function will repeatedly evict
667 * resources of the same type until the validation succeeds.
668 *
669 * Return: Zero on success, -ERESTARTSYS if interrupted, negative error code
670 * on failure.
671 */
672int vmw_resource_validate(struct vmw_resource *res, bool intr,
673 bool dirtying)
674{
675 int ret;
676 struct vmw_resource *evict_res;
677 struct vmw_private *dev_priv = res->dev_priv;
678 struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
679 struct ttm_validate_buffer val_buf;
680 unsigned err_count = 0;
681
682 if (!res->func->create)
683 return 0;
684
685 val_buf.bo = NULL;
686 val_buf.num_shared = 0;
687 if (res->guest_memory_bo)
688 val_buf.bo = &res->guest_memory_bo->tbo;
689 do {
690 ret = vmw_resource_do_validate(res, val_buf: &val_buf, dirtying);
691 if (likely(ret != -EBUSY))
692 break;
693
694 spin_lock(lock: &dev_priv->resource_lock);
695 if (list_empty(head: lru_list) || !res->func->may_evict) {
696 DRM_ERROR("Out of device device resources "
697 "for %s.\n", res->func->type_name);
698 ret = -EBUSY;
699 spin_unlock(lock: &dev_priv->resource_lock);
700 break;
701 }
702
703 evict_res = vmw_resource_reference
704 (list_first_entry(lru_list, struct vmw_resource,
705 lru_head));
706 list_del_init(entry: &evict_res->lru_head);
707
708 spin_unlock(lock: &dev_priv->resource_lock);
709
710 /* Trylock backup buffers with a NULL ticket. */
711 ret = vmw_resource_do_evict(NULL, res: evict_res, interruptible: intr);
712 if (unlikely(ret != 0)) {
713 spin_lock(lock: &dev_priv->resource_lock);
714 list_add_tail(new: &evict_res->lru_head, head: lru_list);
715 spin_unlock(lock: &dev_priv->resource_lock);
716 if (ret == -ERESTARTSYS ||
717 ++err_count > VMW_RES_EVICT_ERR_COUNT) {
718 vmw_resource_unreference(p_res: &evict_res);
719 goto out_no_validate;
720 }
721 }
722
723 vmw_resource_unreference(p_res: &evict_res);
724 } while (1);
725
726 if (unlikely(ret != 0))
727 goto out_no_validate;
728 else if (!res->func->needs_guest_memory && res->guest_memory_bo) {
729 WARN_ON_ONCE(vmw_resource_mob_attached(res));
730 vmw_user_bo_unref(buf: &res->guest_memory_bo);
731 }
732
733 return 0;
734
735out_no_validate:
736 return ret;
737}
738
739
740/**
741 * vmw_resource_unbind_list
742 *
743 * @vbo: Pointer to the current backing MOB.
744 *
745 * Evicts the Guest Backed hardware resource if the backup
746 * buffer is being moved out of MOB memory.
747 * Note that this function will not race with the resource
748 * validation code, since resource validation and eviction
749 * both require the backup buffer to be reserved.
750 */
751void vmw_resource_unbind_list(struct vmw_bo *vbo)
752{
753 struct ttm_validate_buffer val_buf = {
754 .bo = &vbo->tbo,
755 .num_shared = 0
756 };
757
758 dma_resv_assert_held(vbo->tbo.base.resv);
759 while (!RB_EMPTY_ROOT(&vbo->res_tree)) {
760 struct rb_node *node = vbo->res_tree.rb_node;
761 struct vmw_resource *res =
762 container_of(node, struct vmw_resource, mob_node);
763
764 if (!WARN_ON_ONCE(!res->func->unbind))
765 (void) res->func->unbind(res, res->res_dirty, &val_buf);
766
767 res->guest_memory_size = true;
768 res->res_dirty = false;
769 vmw_resource_mob_detach(res);
770 }
771
772 (void) ttm_bo_wait(bo: &vbo->tbo, intr: false, no_wait: false);
773}
774
775
776/**
777 * vmw_query_readback_all - Read back cached query states
778 *
779 * @dx_query_mob: Buffer containing the DX query MOB
780 *
781 * Read back cached states from the device if they exist. This function
782 * assumes binding_mutex is held.
783 */
784int vmw_query_readback_all(struct vmw_bo *dx_query_mob)
785{
786 struct vmw_resource *dx_query_ctx;
787 struct vmw_private *dev_priv;
788 struct {
789 SVGA3dCmdHeader header;
790 SVGA3dCmdDXReadbackAllQuery body;
791 } *cmd;
792
793
794 /* No query bound, so do nothing */
795 if (!dx_query_mob || !dx_query_mob->dx_query_ctx)
796 return 0;
797
798 dx_query_ctx = dx_query_mob->dx_query_ctx;
799 dev_priv = dx_query_ctx->dev_priv;
800
801 cmd = VMW_CMD_CTX_RESERVE(dev_priv, sizeof(*cmd), dx_query_ctx->id);
802 if (unlikely(cmd == NULL))
803 return -ENOMEM;
804
805 cmd->header.id = SVGA_3D_CMD_DX_READBACK_ALL_QUERY;
806 cmd->header.size = sizeof(cmd->body);
807 cmd->body.cid = dx_query_ctx->id;
808
809 vmw_cmd_commit(dev_priv, bytes: sizeof(*cmd));
810
811 /* Triggers a rebind the next time affected context is bound */
812 dx_query_mob->dx_query_ctx = NULL;
813
814 return 0;
815}
816
817
818
819/**
820 * vmw_query_move_notify - Read back cached query states
821 *
822 * @bo: The TTM buffer object about to move.
823 * @old_mem: The memory region @bo is moving from.
824 * @new_mem: The memory region @bo is moving to.
825 *
826 * Called before the query MOB is swapped out to read back cached query
827 * states from the device.
828 */
829void vmw_query_move_notify(struct ttm_buffer_object *bo,
830 struct ttm_resource *old_mem,
831 struct ttm_resource *new_mem)
832{
833 struct vmw_bo *dx_query_mob;
834 struct ttm_device *bdev = bo->bdev;
835 struct vmw_private *dev_priv = vmw_priv_from_ttm(bdev);
836
837 mutex_lock(&dev_priv->binding_mutex);
838
839 /* If BO is being moved from MOB to system memory */
840 if (old_mem &&
841 new_mem->mem_type == TTM_PL_SYSTEM &&
842 old_mem->mem_type == VMW_PL_MOB) {
843 struct vmw_fence_obj *fence;
844
845 dx_query_mob = to_vmw_bo(gobj: &bo->base);
846 if (!dx_query_mob || !dx_query_mob->dx_query_ctx) {
847 mutex_unlock(lock: &dev_priv->binding_mutex);
848 return;
849 }
850
851 (void) vmw_query_readback_all(dx_query_mob);
852 mutex_unlock(lock: &dev_priv->binding_mutex);
853
854 /* Create a fence and attach the BO to it */
855 (void) vmw_execbuf_fence_commands(NULL, dev_priv, p_fence: &fence, NULL);
856 vmw_bo_fence_single(bo, fence);
857
858 if (fence != NULL)
859 vmw_fence_obj_unreference(fence_p: &fence);
860
861 (void) ttm_bo_wait(bo, intr: false, no_wait: false);
862 } else
863 mutex_unlock(lock: &dev_priv->binding_mutex);
864}
865
866/**
867 * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
868 *
869 * @res: The resource being queried.
870 */
871bool vmw_resource_needs_backup(const struct vmw_resource *res)
872{
873 return res->func->needs_guest_memory;
874}
875
876/**
877 * vmw_resource_evict_type - Evict all resources of a specific type
878 *
879 * @dev_priv: Pointer to a device private struct
880 * @type: The resource type to evict
881 *
882 * To avoid thrashing starvation or as part of the hibernation sequence,
883 * try to evict all evictable resources of a specific type.
884 */
885static void vmw_resource_evict_type(struct vmw_private *dev_priv,
886 enum vmw_res_type type)
887{
888 struct list_head *lru_list = &dev_priv->res_lru[type];
889 struct vmw_resource *evict_res;
890 unsigned err_count = 0;
891 int ret;
892 struct ww_acquire_ctx ticket;
893
894 do {
895 spin_lock(lock: &dev_priv->resource_lock);
896
897 if (list_empty(head: lru_list))
898 goto out_unlock;
899
900 evict_res = vmw_resource_reference(
901 list_first_entry(lru_list, struct vmw_resource,
902 lru_head));
903 list_del_init(entry: &evict_res->lru_head);
904 spin_unlock(lock: &dev_priv->resource_lock);
905
906 /* Wait lock backup buffers with a ticket. */
907 ret = vmw_resource_do_evict(ticket: &ticket, res: evict_res, interruptible: false);
908 if (unlikely(ret != 0)) {
909 spin_lock(lock: &dev_priv->resource_lock);
910 list_add_tail(new: &evict_res->lru_head, head: lru_list);
911 spin_unlock(lock: &dev_priv->resource_lock);
912 if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
913 vmw_resource_unreference(p_res: &evict_res);
914 return;
915 }
916 }
917
918 vmw_resource_unreference(p_res: &evict_res);
919 } while (1);
920
921out_unlock:
922 spin_unlock(lock: &dev_priv->resource_lock);
923}
924
925/**
926 * vmw_resource_evict_all - Evict all evictable resources
927 *
928 * @dev_priv: Pointer to a device private struct
929 *
930 * To avoid thrashing starvation or as part of the hibernation sequence,
931 * evict all evictable resources. In particular this means that all
932 * guest-backed resources that are registered with the device are
933 * evicted and the OTable becomes clean.
934 */
935void vmw_resource_evict_all(struct vmw_private *dev_priv)
936{
937 enum vmw_res_type type;
938
939 mutex_lock(&dev_priv->cmdbuf_mutex);
940
941 for (type = 0; type < vmw_res_max; ++type)
942 vmw_resource_evict_type(dev_priv, type);
943
944 mutex_unlock(lock: &dev_priv->cmdbuf_mutex);
945}
946
947/*
948 * vmw_resource_pin - Add a pin reference on a resource
949 *
950 * @res: The resource to add a pin reference on
951 *
952 * This function adds a pin reference, and if needed validates the resource.
953 * Having a pin reference means that the resource can never be evicted, and
954 * its id will never change as long as there is a pin reference.
955 * This function returns 0 on success and a negative error code on failure.
956 */
957int vmw_resource_pin(struct vmw_resource *res, bool interruptible)
958{
959 struct ttm_operation_ctx ctx = { interruptible, false };
960 struct vmw_private *dev_priv = res->dev_priv;
961 int ret;
962
963 mutex_lock(&dev_priv->cmdbuf_mutex);
964 ret = vmw_resource_reserve(res, interruptible, no_guest_memory: false);
965 if (ret)
966 goto out_no_reserve;
967
968 if (res->pin_count == 0) {
969 struct vmw_bo *vbo = NULL;
970
971 if (res->guest_memory_bo) {
972 vbo = res->guest_memory_bo;
973
974 ret = ttm_bo_reserve(bo: &vbo->tbo, interruptible, no_wait: false, NULL);
975 if (ret)
976 goto out_no_validate;
977 if (!vbo->tbo.pin_count) {
978 vmw_bo_placement_set(bo: vbo,
979 domain: res->func->domain,
980 busy_domain: res->func->busy_domain);
981 ret = ttm_bo_validate
982 (bo: &vbo->tbo,
983 placement: &vbo->placement,
984 ctx: &ctx);
985 if (ret) {
986 ttm_bo_unreserve(bo: &vbo->tbo);
987 goto out_no_validate;
988 }
989 }
990
991 /* Do we really need to pin the MOB as well? */
992 vmw_bo_pin_reserved(bo: vbo, pin: true);
993 }
994 ret = vmw_resource_validate(res, intr: interruptible, dirtying: true);
995 if (vbo)
996 ttm_bo_unreserve(bo: &vbo->tbo);
997 if (ret)
998 goto out_no_validate;
999 }
1000 res->pin_count++;
1001
1002out_no_validate:
1003 vmw_resource_unreserve(res, dirty_set: false, dirty: false, switch_guest_memory: false, NULL, new_guest_memory_offset: 0UL);
1004out_no_reserve:
1005 mutex_unlock(lock: &dev_priv->cmdbuf_mutex);
1006
1007 return ret;
1008}
1009
1010/**
1011 * vmw_resource_unpin - Remove a pin reference from a resource
1012 *
1013 * @res: The resource to remove a pin reference from
1014 *
1015 * Having a pin reference means that the resource can never be evicted, and
1016 * its id will never change as long as there is a pin reference.
1017 */
1018void vmw_resource_unpin(struct vmw_resource *res)
1019{
1020 struct vmw_private *dev_priv = res->dev_priv;
1021 int ret;
1022
1023 mutex_lock(&dev_priv->cmdbuf_mutex);
1024
1025 ret = vmw_resource_reserve(res, interruptible: false, no_guest_memory: true);
1026 WARN_ON(ret);
1027
1028 WARN_ON(res->pin_count == 0);
1029 if (--res->pin_count == 0 && res->guest_memory_bo) {
1030 struct vmw_bo *vbo = res->guest_memory_bo;
1031
1032 (void) ttm_bo_reserve(bo: &vbo->tbo, interruptible: false, no_wait: false, NULL);
1033 vmw_bo_pin_reserved(bo: vbo, pin: false);
1034 ttm_bo_unreserve(bo: &vbo->tbo);
1035 }
1036
1037 vmw_resource_unreserve(res, dirty_set: false, dirty: false, switch_guest_memory: false, NULL, new_guest_memory_offset: 0UL);
1038
1039 mutex_unlock(lock: &dev_priv->cmdbuf_mutex);
1040}
1041
1042/**
1043 * vmw_res_type - Return the resource type
1044 *
1045 * @res: Pointer to the resource
1046 */
1047enum vmw_res_type vmw_res_type(const struct vmw_resource *res)
1048{
1049 return res->func->res_type;
1050}
1051
1052/**
1053 * vmw_resource_dirty_update - Update a resource's dirty tracker with a
1054 * sequential range of touched backing store memory.
1055 * @res: The resource.
1056 * @start: The first page touched.
1057 * @end: The last page touched + 1.
1058 */
1059void vmw_resource_dirty_update(struct vmw_resource *res, pgoff_t start,
1060 pgoff_t end)
1061{
1062 if (res->dirty)
1063 res->func->dirty_range_add(res, start << PAGE_SHIFT,
1064 end << PAGE_SHIFT);
1065}
1066
1067/**
1068 * vmw_resources_clean - Clean resources intersecting a mob range
1069 * @vbo: The mob buffer object
1070 * @start: The mob page offset starting the range
1071 * @end: The mob page offset ending the range
1072 * @num_prefault: Returns how many pages including the first have been
1073 * cleaned and are ok to prefault
1074 */
1075int vmw_resources_clean(struct vmw_bo *vbo, pgoff_t start,
1076 pgoff_t end, pgoff_t *num_prefault)
1077{
1078 struct rb_node *cur = vbo->res_tree.rb_node;
1079 struct vmw_resource *found = NULL;
1080 unsigned long res_start = start << PAGE_SHIFT;
1081 unsigned long res_end = end << PAGE_SHIFT;
1082 unsigned long last_cleaned = 0;
1083
1084 /*
1085 * Find the resource with lowest backup_offset that intersects the
1086 * range.
1087 */
1088 while (cur) {
1089 struct vmw_resource *cur_res =
1090 container_of(cur, struct vmw_resource, mob_node);
1091
1092 if (cur_res->guest_memory_offset >= res_end) {
1093 cur = cur->rb_left;
1094 } else if (cur_res->guest_memory_offset + cur_res->guest_memory_size <=
1095 res_start) {
1096 cur = cur->rb_right;
1097 } else {
1098 found = cur_res;
1099 cur = cur->rb_left;
1100 /* Continue to look for resources with lower offsets */
1101 }
1102 }
1103
1104 /*
1105 * In order of increasing guest_memory_offset, clean dirty resources
1106 * intersecting the range.
1107 */
1108 while (found) {
1109 if (found->res_dirty) {
1110 int ret;
1111
1112 if (!found->func->clean)
1113 return -EINVAL;
1114
1115 ret = found->func->clean(found);
1116 if (ret)
1117 return ret;
1118
1119 found->res_dirty = false;
1120 }
1121 last_cleaned = found->guest_memory_offset + found->guest_memory_size;
1122 cur = rb_next(&found->mob_node);
1123 if (!cur)
1124 break;
1125
1126 found = container_of(cur, struct vmw_resource, mob_node);
1127 if (found->guest_memory_offset >= res_end)
1128 break;
1129 }
1130
1131 /*
1132 * Set number of pages allowed prefaulting and fence the buffer object
1133 */
1134 *num_prefault = 1;
1135 if (last_cleaned > res_start) {
1136 struct ttm_buffer_object *bo = &vbo->tbo;
1137
1138 *num_prefault = __KERNEL_DIV_ROUND_UP(last_cleaned - res_start,
1139 PAGE_SIZE);
1140 vmw_bo_fence_single(bo, NULL);
1141 }
1142
1143 return 0;
1144}
1145

source code of linux/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c