1// SPDX-License-Identifier: GPL-2.0 OR MIT
   2/**************************************************************************
   3 *
   4 * Copyright 2009-2015 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_resource_priv.h"
  31#include "vmwgfx_binding.h"
  32#include "vmwgfx_drv.h"
  33
  34#define VMW_RES_EVICT_ERR_COUNT 10
  35
  36/**
  37 * vmw_resource_mob_attach - Mark a resource as attached to its backing mob
  38 * @res: The resource
  39 */
  40void vmw_resource_mob_attach(struct vmw_resource *res)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  41{
  42	struct vmw_buffer_object *backup = res->backup;
  43
  44	dma_resv_assert_held(res->backup->base.base.resv);
  45	res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
  46		res->func->prio;
  47	list_add_tail(&res->mob_head, &backup->res_list);
  48	vmw_bo_prio_add(backup, res->used_prio);
  49}
  50
  51/**
  52 * vmw_resource_mob_detach - Mark a resource as detached from its backing mob
  53 * @res: The resource
  54 */
  55void vmw_resource_mob_detach(struct vmw_resource *res)
  56{
  57	struct vmw_buffer_object *backup = res->backup;
  58
  59	dma_resv_assert_held(backup->base.base.resv);
  60	if (vmw_resource_mob_attached(res)) {
  61		list_del_init(&res->mob_head);
  62		vmw_bo_prio_del(backup, res->used_prio);
  63	}
  64}
  65
  66struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
  67{
  68	kref_get(&res->kref);
  69	return res;
  70}
  71
  72struct vmw_resource *
  73vmw_resource_reference_unless_doomed(struct vmw_resource *res)
  74{
  75	return kref_get_unless_zero(&res->kref) ? res : NULL;
  76}
  77
  78/**
  79 * vmw_resource_release_id - release a resource id to the id manager.
  80 *
  81 * @res: Pointer to the resource.
  82 *
  83 * Release the resource id to the resource id manager and set it to -1
  84 */
  85void vmw_resource_release_id(struct vmw_resource *res)
  86{
  87	struct vmw_private *dev_priv = res->dev_priv;
  88	struct idr *idr = &dev_priv->res_idr[res->func->res_type];
  89
  90	spin_lock(&dev_priv->resource_lock);
  91	if (res->id != -1)
  92		idr_remove(idr, res->id);
  93	res->id = -1;
  94	spin_unlock(&dev_priv->resource_lock);
  95}
  96
  97static void vmw_resource_release(struct kref *kref)
  98{
  99	struct vmw_resource *res =
 100	    container_of(kref, struct vmw_resource, kref);
 101	struct vmw_private *dev_priv = res->dev_priv;
 102	int id;
 103	struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 104
 105	spin_lock(&dev_priv->resource_lock);
 
 106	list_del_init(&res->lru_head);
 107	spin_unlock(&dev_priv->resource_lock);
 108	if (res->backup) {
 109		struct ttm_buffer_object *bo = &res->backup->base;
 110
 111		ttm_bo_reserve(bo, false, false, NULL);
 112		if (vmw_resource_mob_attached(res) &&
 113		    res->func->unbind != NULL) {
 114			struct ttm_validate_buffer val_buf;
 115
 116			val_buf.bo = bo;
 117			val_buf.num_shared = 0;
 118			res->func->unbind(res, false, &val_buf);
 119		}
 120		res->backup_dirty = false;
 121		vmw_resource_mob_detach(res);
 122		ttm_bo_unreserve(bo);
 123		vmw_bo_unreference(&res->backup);
 124	}
 125
 126	if (likely(res->hw_destroy != NULL)) {
 127		mutex_lock(&dev_priv->binding_mutex);
 128		vmw_binding_res_list_kill(&res->binding_head);
 129		mutex_unlock(&dev_priv->binding_mutex);
 130		res->hw_destroy(res);
 131	}
 132
 133	id = res->id;
 134	if (res->res_free != NULL)
 135		res->res_free(res);
 136	else
 137		kfree(res);
 138
 139	spin_lock(&dev_priv->resource_lock);
 140	if (id != -1)
 141		idr_remove(idr, id);
 142	spin_unlock(&dev_priv->resource_lock);
 143}
 144
 145void vmw_resource_unreference(struct vmw_resource **p_res)
 146{
 147	struct vmw_resource *res = *p_res;
 148
 149	*p_res = NULL;
 150	kref_put(&res->kref, vmw_resource_release);
 151}
 152
 153
 154/**
 155 * vmw_resource_alloc_id - release a resource id to the id manager.
 156 *
 157 * @res: Pointer to the resource.
 158 *
 159 * Allocate the lowest free resource from the resource manager, and set
 160 * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
 161 */
 162int vmw_resource_alloc_id(struct vmw_resource *res)
 163{
 164	struct vmw_private *dev_priv = res->dev_priv;
 165	int ret;
 166	struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 167
 168	BUG_ON(res->id != -1);
 169
 170	idr_preload(GFP_KERNEL);
 171	spin_lock(&dev_priv->resource_lock);
 172
 173	ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
 174	if (ret >= 0)
 175		res->id = ret;
 176
 177	spin_unlock(&dev_priv->resource_lock);
 178	idr_preload_end();
 179	return ret < 0 ? ret : 0;
 180}
 181
 182/**
 183 * vmw_resource_init - initialize a struct vmw_resource
 184 *
 185 * @dev_priv:       Pointer to a device private struct.
 186 * @res:            The struct vmw_resource to initialize.
 187 * @obj_type:       Resource object type.
 188 * @delay_id:       Boolean whether to defer device id allocation until
 189 *                  the first validation.
 190 * @res_free:       Resource destructor.
 191 * @func:           Resource function table.
 192 */
 193int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
 194		      bool delay_id,
 195		      void (*res_free) (struct vmw_resource *res),
 196		      const struct vmw_res_func *func)
 197{
 198	kref_init(&res->kref);
 199	res->hw_destroy = NULL;
 200	res->res_free = res_free;
 
 201	res->dev_priv = dev_priv;
 202	res->func = func;
 203	INIT_LIST_HEAD(&res->lru_head);
 204	INIT_LIST_HEAD(&res->mob_head);
 205	INIT_LIST_HEAD(&res->binding_head);
 206	res->id = -1;
 207	res->backup = NULL;
 208	res->backup_offset = 0;
 209	res->backup_dirty = false;
 210	res->res_dirty = false;
 211	res->used_prio = 3;
 212	if (delay_id)
 213		return 0;
 214	else
 215		return vmw_resource_alloc_id(res);
 216}
 217
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 218
 219/**
 220 * vmw_user_resource_lookup_handle - lookup a struct resource from a
 221 * TTM user-space handle and perform basic type checks
 222 *
 223 * @dev_priv:     Pointer to a device private struct
 224 * @tfile:        Pointer to a struct ttm_object_file identifying the caller
 225 * @handle:       The TTM user-space handle
 226 * @converter:    Pointer to an object describing the resource type
 227 * @p_res:        On successful return the location pointed to will contain
 228 *                a pointer to a refcounted struct vmw_resource.
 229 *
 230 * If the handle can't be found or is associated with an incorrect resource
 231 * type, -EINVAL will be returned.
 232 */
 233int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
 234				    struct ttm_object_file *tfile,
 235				    uint32_t handle,
 236				    const struct vmw_user_resource_conv
 237				    *converter,
 238				    struct vmw_resource **p_res)
 239{
 240	struct ttm_base_object *base;
 241	struct vmw_resource *res;
 242	int ret = -EINVAL;
 243
 244	base = ttm_base_object_lookup(tfile, handle);
 245	if (unlikely(base == NULL))
 246		return -EINVAL;
 247
 248	if (unlikely(ttm_base_object_type(base) != converter->object_type))
 249		goto out_bad_resource;
 250
 251	res = converter->base_obj_to_res(base);
 
 
 
 
 
 
 
 252	kref_get(&res->kref);
 
 253
 254	*p_res = res;
 255	ret = 0;
 256
 257out_bad_resource:
 258	ttm_base_object_unref(&base);
 259
 260	return ret;
 261}
 262
 263/**
 264 * vmw_user_resource_lookup_handle - lookup a struct resource from a
 265 * TTM user-space handle and perform basic type checks
 266 *
 267 * @dev_priv:     Pointer to a device private struct
 268 * @tfile:        Pointer to a struct ttm_object_file identifying the caller
 269 * @handle:       The TTM user-space handle
 270 * @converter:    Pointer to an object describing the resource type
 271 * @p_res:        On successful return the location pointed to will contain
 272 *                a pointer to a refcounted struct vmw_resource.
 273 *
 274 * If the handle can't be found or is associated with an incorrect resource
 275 * type, -EINVAL will be returned.
 276 */
 277struct vmw_resource *
 278vmw_user_resource_noref_lookup_handle(struct vmw_private *dev_priv,
 279				      struct ttm_object_file *tfile,
 280				      uint32_t handle,
 281				      const struct vmw_user_resource_conv
 282				      *converter)
 283{
 284	struct ttm_base_object *base;
 285
 286	base = ttm_base_object_noref_lookup(tfile, handle);
 287	if (!base)
 288		return ERR_PTR(-ESRCH);
 289
 290	if (unlikely(ttm_base_object_type(base) != converter->object_type)) {
 291		ttm_base_object_noref_release();
 292		return ERR_PTR(-EINVAL);
 293	}
 294
 295	return converter->base_obj_to_res(base);
 296}
 297
 298/**
 299 * Helper function that looks either a surface or bo.
 300 *
 301 * The pointer this pointed at by out_surf and out_buf needs to be null.
 302 */
 303int vmw_user_lookup_handle(struct vmw_private *dev_priv,
 304			   struct ttm_object_file *tfile,
 305			   uint32_t handle,
 306			   struct vmw_surface **out_surf,
 307			   struct vmw_buffer_object **out_buf)
 308{
 309	struct vmw_resource *res;
 310	int ret;
 311
 312	BUG_ON(*out_surf || *out_buf);
 313
 314	ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
 315					      user_surface_converter,
 316					      &res);
 317	if (!ret) {
 318		*out_surf = vmw_res_to_srf(res);
 319		return 0;
 320	}
 321
 322	*out_surf = NULL;
 323	ret = vmw_user_bo_lookup(tfile, handle, out_buf, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 324	return ret;
 325}
 326
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 327/**
 328 * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
 329 *
 330 * @res:            The resource for which to allocate a backup buffer.
 331 * @interruptible:  Whether any sleeps during allocation should be
 332 *                  performed while interruptible.
 333 */
 334static int vmw_resource_buf_alloc(struct vmw_resource *res,
 335				  bool interruptible)
 336{
 337	unsigned long size =
 338		(res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
 339	struct vmw_buffer_object *backup;
 340	int ret;
 341
 342	if (likely(res->backup)) {
 343		BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
 344		return 0;
 345	}
 346
 347	backup = kzalloc(sizeof(*backup), GFP_KERNEL);
 348	if (unlikely(!backup))
 349		return -ENOMEM;
 350
 351	ret = vmw_bo_init(res->dev_priv, backup, res->backup_size,
 352			      res->func->backup_placement,
 353			      interruptible,
 354			      &vmw_bo_bo_free);
 355	if (unlikely(ret != 0))
 356		goto out_no_bo;
 357
 358	res->backup = backup;
 359
 360out_no_bo:
 361	return ret;
 362}
 363
 364/**
 365 * vmw_resource_do_validate - Make a resource up-to-date and visible
 366 *                            to the device.
 367 *
 368 * @res:            The resource to make visible to the device.
 369 * @val_buf:        Information about a buffer possibly
 370 *                  containing backup data if a bind operation is needed.
 371 *
 372 * On hardware resource shortage, this function returns -EBUSY and
 373 * should be retried once resources have been freed up.
 374 */
 375static int vmw_resource_do_validate(struct vmw_resource *res,
 376				    struct ttm_validate_buffer *val_buf)
 377{
 378	int ret = 0;
 379	const struct vmw_res_func *func = res->func;
 380
 381	if (unlikely(res->id == -1)) {
 382		ret = func->create(res);
 383		if (unlikely(ret != 0))
 384			return ret;
 385	}
 386
 387	if (func->bind &&
 388	    ((func->needs_backup && !vmw_resource_mob_attached(res) &&
 389	      val_buf->bo != NULL) ||
 390	     (!func->needs_backup && val_buf->bo != NULL))) {
 391		ret = func->bind(res, val_buf);
 392		if (unlikely(ret != 0))
 393			goto out_bind_failed;
 394		if (func->needs_backup)
 395			vmw_resource_mob_attach(res);
 396	}
 397
 
 
 
 
 
 
 
 
 398	return 0;
 399
 400out_bind_failed:
 401	func->destroy(res);
 402
 403	return ret;
 404}
 405
 406/**
 407 * vmw_resource_unreserve - Unreserve a resource previously reserved for
 408 * command submission.
 409 *
 410 * @res:               Pointer to the struct vmw_resource to unreserve.
 411 * @dirty_set:         Change dirty status of the resource.
 412 * @dirty:             When changing dirty status indicates the new status.
 413 * @switch_backup:     Backup buffer has been switched.
 414 * @new_backup:        Pointer to new backup buffer if command submission
 415 *                     switched. May be NULL.
 416 * @new_backup_offset: New backup offset if @switch_backup is true.
 417 *
 418 * Currently unreserving a resource means putting it back on the device's
 419 * resource lru list, so that it can be evicted if necessary.
 420 */
 421void vmw_resource_unreserve(struct vmw_resource *res,
 422			    bool dirty_set,
 423			    bool dirty,
 424			    bool switch_backup,
 425			    struct vmw_buffer_object *new_backup,
 426			    unsigned long new_backup_offset)
 427{
 428	struct vmw_private *dev_priv = res->dev_priv;
 429
 430	if (!list_empty(&res->lru_head))
 431		return;
 432
 433	if (switch_backup && new_backup != res->backup) {
 434		if (res->backup) {
 435			vmw_resource_mob_detach(res);
 436			vmw_bo_unreference(&res->backup);
 
 437		}
 438
 439		if (new_backup) {
 440			res->backup = vmw_bo_reference(new_backup);
 441			vmw_resource_mob_attach(res);
 
 442		} else {
 443			res->backup = NULL;
 444		}
 445	}
 446	if (switch_backup)
 447		res->backup_offset = new_backup_offset;
 448
 449	if (dirty_set)
 450		res->res_dirty = dirty;
 451
 452	if (!res->func->may_evict || res->id == -1 || res->pin_count)
 453		return;
 454
 455	spin_lock(&dev_priv->resource_lock);
 456	list_add_tail(&res->lru_head,
 457		      &res->dev_priv->res_lru[res->func->res_type]);
 458	spin_unlock(&dev_priv->resource_lock);
 459}
 460
 461/**
 462 * vmw_resource_check_buffer - Check whether a backup buffer is needed
 463 *                             for a resource and in that case, allocate
 464 *                             one, reserve and validate it.
 465 *
 466 * @ticket:         The ww aqcquire context to use, or NULL if trylocking.
 467 * @res:            The resource for which to allocate a backup buffer.
 468 * @interruptible:  Whether any sleeps during allocation should be
 469 *                  performed while interruptible.
 470 * @val_buf:        On successful return contains data about the
 471 *                  reserved and validated backup buffer.
 472 */
 473static int
 474vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
 475			  struct vmw_resource *res,
 476			  bool interruptible,
 477			  struct ttm_validate_buffer *val_buf)
 478{
 479	struct ttm_operation_ctx ctx = { true, false };
 480	struct list_head val_list;
 481	bool backup_dirty = false;
 482	int ret;
 483
 484	if (unlikely(res->backup == NULL)) {
 485		ret = vmw_resource_buf_alloc(res, interruptible);
 486		if (unlikely(ret != 0))
 487			return ret;
 488	}
 489
 490	INIT_LIST_HEAD(&val_list);
 491	ttm_bo_get(&res->backup->base);
 492	val_buf->bo = &res->backup->base;
 493	val_buf->num_shared = 0;
 494	list_add_tail(&val_buf->head, &val_list);
 495	ret = ttm_eu_reserve_buffers(ticket, &val_list, interruptible, NULL,
 496				     true);
 497	if (unlikely(ret != 0))
 498		goto out_no_reserve;
 499
 500	if (res->func->needs_backup && !vmw_resource_mob_attached(res))
 501		return 0;
 502
 503	backup_dirty = res->backup_dirty;
 504	ret = ttm_bo_validate(&res->backup->base,
 505			      res->func->backup_placement,
 506			      &ctx);
 507
 508	if (unlikely(ret != 0))
 509		goto out_no_validate;
 510
 511	return 0;
 512
 513out_no_validate:
 514	ttm_eu_backoff_reservation(ticket, &val_list);
 515out_no_reserve:
 516	ttm_bo_put(val_buf->bo);
 517	val_buf->bo = NULL;
 518	if (backup_dirty)
 519		vmw_bo_unreference(&res->backup);
 520
 521	return ret;
 522}
 523
 524/**
 525 * vmw_resource_reserve - Reserve a resource for command submission
 526 *
 527 * @res:            The resource to reserve.
 528 *
 529 * This function takes the resource off the LRU list and make sure
 530 * a backup buffer is present for guest-backed resources. However,
 531 * the buffer may not be bound to the resource at this point.
 532 *
 533 */
 534int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
 535			 bool no_backup)
 536{
 537	struct vmw_private *dev_priv = res->dev_priv;
 538	int ret;
 539
 540	spin_lock(&dev_priv->resource_lock);
 541	list_del_init(&res->lru_head);
 542	spin_unlock(&dev_priv->resource_lock);
 543
 544	if (res->func->needs_backup && res->backup == NULL &&
 545	    !no_backup) {
 546		ret = vmw_resource_buf_alloc(res, interruptible);
 547		if (unlikely(ret != 0)) {
 548			DRM_ERROR("Failed to allocate a backup buffer "
 549				  "of size %lu. bytes\n",
 550				  (unsigned long) res->backup_size);
 551			return ret;
 552		}
 553	}
 554
 555	return 0;
 556}
 557
 558/**
 559 * vmw_resource_backoff_reservation - Unreserve and unreference a
 560 *                                    backup buffer
 561 *.
 562 * @ticket:         The ww acquire ctx used for reservation.
 563 * @val_buf:        Backup buffer information.
 564 */
 565static void
 566vmw_resource_backoff_reservation(struct ww_acquire_ctx *ticket,
 567				 struct ttm_validate_buffer *val_buf)
 568{
 569	struct list_head val_list;
 570
 571	if (likely(val_buf->bo == NULL))
 572		return;
 573
 574	INIT_LIST_HEAD(&val_list);
 575	list_add_tail(&val_buf->head, &val_list);
 576	ttm_eu_backoff_reservation(ticket, &val_list);
 577	ttm_bo_put(val_buf->bo);
 578	val_buf->bo = NULL;
 579}
 580
 581/**
 582 * vmw_resource_do_evict - Evict a resource, and transfer its data
 583 *                         to a backup buffer.
 584 *
 585 * @ticket:         The ww acquire ticket to use, or NULL if trylocking.
 586 * @res:            The resource to evict.
 587 * @interruptible:  Whether to wait interruptible.
 588 */
 589static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket,
 590				 struct vmw_resource *res, bool interruptible)
 591{
 592	struct ttm_validate_buffer val_buf;
 593	const struct vmw_res_func *func = res->func;
 594	int ret;
 595
 596	BUG_ON(!func->may_evict);
 597
 598	val_buf.bo = NULL;
 599	val_buf.num_shared = 0;
 600	ret = vmw_resource_check_buffer(ticket, res, interruptible, &val_buf);
 601	if (unlikely(ret != 0))
 602		return ret;
 603
 604	if (unlikely(func->unbind != NULL &&
 605		     (!func->needs_backup || vmw_resource_mob_attached(res)))) {
 606		ret = func->unbind(res, res->res_dirty, &val_buf);
 607		if (unlikely(ret != 0))
 608			goto out_no_unbind;
 609		vmw_resource_mob_detach(res);
 610	}
 611	ret = func->destroy(res);
 612	res->backup_dirty = true;
 613	res->res_dirty = false;
 614out_no_unbind:
 615	vmw_resource_backoff_reservation(ticket, &val_buf);
 616
 617	return ret;
 618}
 619
 620
 621/**
 622 * vmw_resource_validate - Make a resource up-to-date and visible
 623 *                         to the device.
 624 * @res: The resource to make visible to the device.
 625 * @intr: Perform waits interruptible if possible.
 626 *
 627 * On succesful return, any backup DMA buffer pointed to by @res->backup will
 628 * be reserved and validated.
 629 * On hardware resource shortage, this function will repeatedly evict
 630 * resources of the same type until the validation succeeds.
 631 *
 632 * Return: Zero on success, -ERESTARTSYS if interrupted, negative error code
 633 * on failure.
 634 */
 635int vmw_resource_validate(struct vmw_resource *res, bool intr)
 636{
 637	int ret;
 638	struct vmw_resource *evict_res;
 639	struct vmw_private *dev_priv = res->dev_priv;
 640	struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
 641	struct ttm_validate_buffer val_buf;
 642	unsigned err_count = 0;
 643
 644	if (!res->func->create)
 645		return 0;
 646
 647	val_buf.bo = NULL;
 648	val_buf.num_shared = 0;
 649	if (res->backup)
 650		val_buf.bo = &res->backup->base;
 651	do {
 652		ret = vmw_resource_do_validate(res, &val_buf);
 653		if (likely(ret != -EBUSY))
 654			break;
 655
 656		spin_lock(&dev_priv->resource_lock);
 657		if (list_empty(lru_list) || !res->func->may_evict) {
 658			DRM_ERROR("Out of device device resources "
 659				  "for %s.\n", res->func->type_name);
 660			ret = -EBUSY;
 661			spin_unlock(&dev_priv->resource_lock);
 662			break;
 663		}
 664
 665		evict_res = vmw_resource_reference
 666			(list_first_entry(lru_list, struct vmw_resource,
 667					  lru_head));
 668		list_del_init(&evict_res->lru_head);
 669
 670		spin_unlock(&dev_priv->resource_lock);
 671
 672		/* Trylock backup buffers with a NULL ticket. */
 673		ret = vmw_resource_do_evict(NULL, evict_res, intr);
 674		if (unlikely(ret != 0)) {
 675			spin_lock(&dev_priv->resource_lock);
 676			list_add_tail(&evict_res->lru_head, lru_list);
 677			spin_unlock(&dev_priv->resource_lock);
 678			if (ret == -ERESTARTSYS ||
 679			    ++err_count > VMW_RES_EVICT_ERR_COUNT) {
 680				vmw_resource_unreference(&evict_res);
 681				goto out_no_validate;
 682			}
 683		}
 684
 685		vmw_resource_unreference(&evict_res);
 686	} while (1);
 687
 688	if (unlikely(ret != 0))
 689		goto out_no_validate;
 690	else if (!res->func->needs_backup && res->backup) {
 691		WARN_ON_ONCE(vmw_resource_mob_attached(res));
 692		vmw_bo_unreference(&res->backup);
 693	}
 694
 695	return 0;
 696
 697out_no_validate:
 698	return ret;
 699}
 700
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 701
 702/**
 703 * vmw_resource_unbind_list
 704 *
 705 * @vbo: Pointer to the current backing MOB.
 
 
 706 *
 707 * Evicts the Guest Backed hardware resource if the backup
 708 * buffer is being moved out of MOB memory.
 709 * Note that this function will not race with the resource
 710 * validation code, since resource validation and eviction
 711 * both require the backup buffer to be reserved.
 
 
 
 
 
 
 712 */
 713void vmw_resource_unbind_list(struct vmw_buffer_object *vbo)
 
 714{
 
 
 
 
 715
 716	struct vmw_resource *res, *next;
 717	struct ttm_validate_buffer val_buf = {
 718		.bo = &vbo->base,
 719		.num_shared = 0
 720	};
 721
 722	dma_resv_assert_held(vbo->base.base.resv);
 723	list_for_each_entry_safe(res, next, &vbo->res_list, mob_head) {
 724		if (!res->func->unbind)
 725			continue;
 726
 727		(void) res->func->unbind(res, res->res_dirty, &val_buf);
 728		res->backup_dirty = true;
 729		res->res_dirty = false;
 730		vmw_resource_mob_detach(res);
 731	}
 
 732
 733	(void) ttm_bo_wait(&vbo->base, false, false);
 
 
 
 
 
 
 
 
 
 
 
 
 734}
 735
 736
 
 737/**
 738 * vmw_query_readback_all - Read back cached query states
 739 *
 740 * @dx_query_mob: Buffer containing the DX query MOB
 741 *
 742 * Read back cached states from the device if they exist.  This function
 743 * assumings binding_mutex is held.
 744 */
 745int vmw_query_readback_all(struct vmw_buffer_object *dx_query_mob)
 746{
 747	struct vmw_resource *dx_query_ctx;
 748	struct vmw_private *dev_priv;
 749	struct {
 750		SVGA3dCmdHeader header;
 751		SVGA3dCmdDXReadbackAllQuery body;
 752	} *cmd;
 753
 754
 755	/* No query bound, so do nothing */
 756	if (!dx_query_mob || !dx_query_mob->dx_query_ctx)
 757		return 0;
 758
 759	dx_query_ctx = dx_query_mob->dx_query_ctx;
 760	dev_priv     = dx_query_ctx->dev_priv;
 761
 762	cmd = VMW_FIFO_RESERVE_DX(dev_priv, sizeof(*cmd), dx_query_ctx->id);
 763	if (unlikely(cmd == NULL))
 
 
 764		return -ENOMEM;
 
 765
 766	cmd->header.id   = SVGA_3D_CMD_DX_READBACK_ALL_QUERY;
 767	cmd->header.size = sizeof(cmd->body);
 768	cmd->body.cid    = dx_query_ctx->id;
 769
 770	vmw_fifo_commit(dev_priv, sizeof(*cmd));
 771
 772	/* Triggers a rebind the next time affected context is bound */
 773	dx_query_mob->dx_query_ctx = NULL;
 774
 775	return 0;
 776}
 777
 778
 779
 780/**
 781 * vmw_query_move_notify - Read back cached query states
 782 *
 783 * @bo: The TTM buffer object about to move.
 784 * @mem: The memory region @bo is moving to.
 785 *
 786 * Called before the query MOB is swapped out to read back cached query
 787 * states from the device.
 788 */
 789void vmw_query_move_notify(struct ttm_buffer_object *bo,
 790			   struct ttm_mem_reg *mem)
 791{
 792	struct vmw_buffer_object *dx_query_mob;
 793	struct ttm_bo_device *bdev = bo->bdev;
 794	struct vmw_private *dev_priv;
 795
 796
 797	dev_priv = container_of(bdev, struct vmw_private, bdev);
 798
 799	mutex_lock(&dev_priv->binding_mutex);
 800
 801	dx_query_mob = container_of(bo, struct vmw_buffer_object, base);
 802	if (mem == NULL || !dx_query_mob || !dx_query_mob->dx_query_ctx) {
 803		mutex_unlock(&dev_priv->binding_mutex);
 804		return;
 805	}
 806
 807	/* If BO is being moved from MOB to system memory */
 808	if (mem->mem_type == TTM_PL_SYSTEM && bo->mem.mem_type == VMW_PL_MOB) {
 809		struct vmw_fence_obj *fence;
 810
 811		(void) vmw_query_readback_all(dx_query_mob);
 812		mutex_unlock(&dev_priv->binding_mutex);
 813
 814		/* Create a fence and attach the BO to it */
 815		(void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
 816		vmw_bo_fence_single(bo, fence);
 817
 818		if (fence != NULL)
 819			vmw_fence_obj_unreference(&fence);
 820
 821		(void) ttm_bo_wait(bo, false, false);
 822	} else
 823		mutex_unlock(&dev_priv->binding_mutex);
 824
 825}
 826
 827/**
 828 * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
 829 *
 830 * @res:            The resource being queried.
 831 */
 832bool vmw_resource_needs_backup(const struct vmw_resource *res)
 833{
 834	return res->func->needs_backup;
 835}
 836
 837/**
 838 * vmw_resource_evict_type - Evict all resources of a specific type
 839 *
 840 * @dev_priv:       Pointer to a device private struct
 841 * @type:           The resource type to evict
 842 *
 843 * To avoid thrashing starvation or as part of the hibernation sequence,
 844 * try to evict all evictable resources of a specific type.
 845 */
 846static void vmw_resource_evict_type(struct vmw_private *dev_priv,
 847				    enum vmw_res_type type)
 848{
 849	struct list_head *lru_list = &dev_priv->res_lru[type];
 850	struct vmw_resource *evict_res;
 851	unsigned err_count = 0;
 852	int ret;
 853	struct ww_acquire_ctx ticket;
 854
 855	do {
 856		spin_lock(&dev_priv->resource_lock);
 857
 858		if (list_empty(lru_list))
 859			goto out_unlock;
 860
 861		evict_res = vmw_resource_reference(
 862			list_first_entry(lru_list, struct vmw_resource,
 863					 lru_head));
 864		list_del_init(&evict_res->lru_head);
 865		spin_unlock(&dev_priv->resource_lock);
 866
 867		/* Wait lock backup buffers with a ticket. */
 868		ret = vmw_resource_do_evict(&ticket, evict_res, false);
 869		if (unlikely(ret != 0)) {
 870			spin_lock(&dev_priv->resource_lock);
 871			list_add_tail(&evict_res->lru_head, lru_list);
 872			spin_unlock(&dev_priv->resource_lock);
 873			if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
 874				vmw_resource_unreference(&evict_res);
 875				return;
 876			}
 877		}
 878
 879		vmw_resource_unreference(&evict_res);
 880	} while (1);
 881
 882out_unlock:
 883	spin_unlock(&dev_priv->resource_lock);
 884}
 885
 886/**
 887 * vmw_resource_evict_all - Evict all evictable resources
 888 *
 889 * @dev_priv:       Pointer to a device private struct
 890 *
 891 * To avoid thrashing starvation or as part of the hibernation sequence,
 892 * evict all evictable resources. In particular this means that all
 893 * guest-backed resources that are registered with the device are
 894 * evicted and the OTable becomes clean.
 895 */
 896void vmw_resource_evict_all(struct vmw_private *dev_priv)
 897{
 898	enum vmw_res_type type;
 899
 900	mutex_lock(&dev_priv->cmdbuf_mutex);
 901
 902	for (type = 0; type < vmw_res_max; ++type)
 903		vmw_resource_evict_type(dev_priv, type);
 904
 905	mutex_unlock(&dev_priv->cmdbuf_mutex);
 906}
 907
 908/**
 909 * vmw_resource_pin - Add a pin reference on a resource
 910 *
 911 * @res: The resource to add a pin reference on
 912 *
 913 * This function adds a pin reference, and if needed validates the resource.
 914 * Having a pin reference means that the resource can never be evicted, and
 915 * its id will never change as long as there is a pin reference.
 916 * This function returns 0 on success and a negative error code on failure.
 917 */
 918int vmw_resource_pin(struct vmw_resource *res, bool interruptible)
 919{
 920	struct ttm_operation_ctx ctx = { interruptible, false };
 921	struct vmw_private *dev_priv = res->dev_priv;
 922	int ret;
 923
 924	ttm_write_lock(&dev_priv->reservation_sem, interruptible);
 925	mutex_lock(&dev_priv->cmdbuf_mutex);
 926	ret = vmw_resource_reserve(res, interruptible, false);
 927	if (ret)
 928		goto out_no_reserve;
 929
 930	if (res->pin_count == 0) {
 931		struct vmw_buffer_object *vbo = NULL;
 932
 933		if (res->backup) {
 934			vbo = res->backup;
 935
 936			ttm_bo_reserve(&vbo->base, interruptible, false, NULL);
 937			if (!vbo->pin_count) {
 938				ret = ttm_bo_validate
 939					(&vbo->base,
 940					 res->func->backup_placement,
 941					 &ctx);
 942				if (ret) {
 943					ttm_bo_unreserve(&vbo->base);
 944					goto out_no_validate;
 945				}
 946			}
 947
 948			/* Do we really need to pin the MOB as well? */
 949			vmw_bo_pin_reserved(vbo, true);
 950		}
 951		ret = vmw_resource_validate(res, interruptible);
 952		if (vbo)
 953			ttm_bo_unreserve(&vbo->base);
 954		if (ret)
 955			goto out_no_validate;
 956	}
 957	res->pin_count++;
 958
 959out_no_validate:
 960	vmw_resource_unreserve(res, false, false, false, NULL, 0UL);
 961out_no_reserve:
 962	mutex_unlock(&dev_priv->cmdbuf_mutex);
 963	ttm_write_unlock(&dev_priv->reservation_sem);
 964
 965	return ret;
 966}
 967
 968/**
 969 * vmw_resource_unpin - Remove a pin reference from a resource
 970 *
 971 * @res: The resource to remove a pin reference from
 972 *
 973 * Having a pin reference means that the resource can never be evicted, and
 974 * its id will never change as long as there is a pin reference.
 975 */
 976void vmw_resource_unpin(struct vmw_resource *res)
 977{
 978	struct vmw_private *dev_priv = res->dev_priv;
 979	int ret;
 980
 981	(void) ttm_read_lock(&dev_priv->reservation_sem, false);
 982	mutex_lock(&dev_priv->cmdbuf_mutex);
 983
 984	ret = vmw_resource_reserve(res, false, true);
 985	WARN_ON(ret);
 986
 987	WARN_ON(res->pin_count == 0);
 988	if (--res->pin_count == 0 && res->backup) {
 989		struct vmw_buffer_object *vbo = res->backup;
 990
 991		(void) ttm_bo_reserve(&vbo->base, false, false, NULL);
 992		vmw_bo_pin_reserved(vbo, false);
 993		ttm_bo_unreserve(&vbo->base);
 994	}
 995
 996	vmw_resource_unreserve(res, false, false, false, NULL, 0UL);
 997
 998	mutex_unlock(&dev_priv->cmdbuf_mutex);
 999	ttm_read_unlock(&dev_priv->reservation_sem);
1000}
1001
1002/**
1003 * vmw_res_type - Return the resource type
1004 *
1005 * @res: Pointer to the resource
1006 */
1007enum vmw_res_type vmw_res_type(const struct vmw_resource *res)
1008{
1009	return res->func->res_type;
1010}