drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf_res.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright 2014-2015 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 "vmwgfx_drv.h"
  29 #include "vmwgfx_resource_priv.h"
  30
  31 #define VMW_CMDBUF_RES_MAN_HT_ORDER 12
  32
  33 /**
  34  * struct vmw_cmdbuf_res - Command buffer managed resource entry.
  35  *
  36  * @res: Refcounted pointer to a struct vmw_resource.
  37  * @hash: Hash entry for the manager hash table.
  38  * @head: List head used either by the staging list or the manager list
  39  * of commited resources.
  40  * @state: Staging state of this resource entry.
  41  * @man: Pointer to a resource manager for this entry.
  42  */
  43 struct vmw_cmdbuf_res {
  44         struct vmw_resource *res;
  45         struct drm_hash_item hash;
  46         struct list_head head;
  47         enum vmw_cmdbuf_res_state state;
  48         struct vmw_cmdbuf_res_manager *man;
  49 };
  50
  51 /**
  52  * struct vmw_cmdbuf_res_manager - Command buffer resource manager.
  53  *
  54  * @resources: Hash table containing staged and commited command buffer
  55  * resources
  56  * @list: List of commited command buffer resources.
  57  * @dev_priv: Pointer to a device private structure.
  58  *
  59  * @resources and @list are protected by the cmdbuf mutex for now.
  60  */
  61 struct vmw_cmdbuf_res_manager {
  62         struct drm_open_hash resources;
  63         struct list_head list;
  64         struct vmw_private *dev_priv;
  65 };
  66
  67
  68 /**
  69  * vmw_cmdbuf_res_lookup - Look up a command buffer resource
  70  *
  71  * @man: Pointer to the command buffer resource manager
  72  * @resource_type: The resource type, that combined with the user key
  73  * identifies the resource.
  74  * @user_key: The user key.
  75  *
  76  * Returns a valid refcounted struct vmw_resource pointer on success,
  77  * an error pointer on failure.
  78  */
  79 struct vmw_resource *
  80 vmw_cmdbuf_res_lookup(struct vmw_cmdbuf_res_manager *man,
  81                       enum vmw_cmdbuf_res_type res_type,
  82                       u32 user_key)
  83 {
  84         struct drm_hash_item *hash;
  85         int ret;
  86         unsigned long key = user_key | (res_type << 24);
  87
  88         ret = drm_ht_find_item(&man->resources, key, &hash);
  89         if (unlikely(ret != 0))
  90                 return ERR_PTR(ret);
  91
  92         return drm_hash_entry(hash, struct vmw_cmdbuf_res, hash)->res;
  93 }
  94
  95 /**
  96  * vmw_cmdbuf_res_free - Free a command buffer resource.
  97  *
  98  * @man: Pointer to the command buffer resource manager
  99  * @entry: Pointer to a struct vmw_cmdbuf_res.
 100  *
 101  * Frees a struct vmw_cmdbuf_res entry and drops its reference to the
 102  * struct vmw_resource.
 103  */
 104 static void vmw_cmdbuf_res_free(struct vmw_cmdbuf_res_manager *man,
 105                                 struct vmw_cmdbuf_res *entry)
 106 {
 107         list_del(&entry->head);
 108         WARN_ON(drm_ht_remove_item(&man->resources, &entry->hash));
 109         vmw_resource_unreference(&entry->res);
 110         kfree(entry);
 111 }
 112
 113 /**
 114  * vmw_cmdbuf_res_commit - Commit a list of command buffer resource actions
 115  *
 116  * @list: Caller's list of command buffer resource actions.
 117  *
 118  * This function commits a list of command buffer resource
 119  * additions or removals.
 120  * It is typically called when the execbuf ioctl call triggering these
 121  * actions has commited the fifo contents to the device.
 122  */
 123 void vmw_cmdbuf_res_commit(struct list_head *list)
 124 {
 125         struct vmw_cmdbuf_res *entry, *next;
 126
 127         list_for_each_entry_safe(entry, next, list, head) {
 128                 list_del(&entry->head);
 129                 if (entry->res->func->commit_notify)
 130                         entry->res->func->commit_notify(entry->res,
 131                                                         entry->state);
 132                 switch (entry->state) {
 133                 case VMW_CMDBUF_RES_ADD:
 134                         entry->state = VMW_CMDBUF_RES_COMMITTED;
 135                         list_add_tail(&entry->head, &entry->man->list);
 136                         break;
 137                 case VMW_CMDBUF_RES_DEL:
 138                         vmw_resource_unreference(&entry->res);
 139                         kfree(entry);
 140                         break;
 141                 default:
 142                         BUG();
 143                         break;
 144                 }
 145         }
 146 }
 147
 148 /**
 149  * vmw_cmdbuf_res_revert - Revert a list of command buffer resource actions
 150  *
 151  * @man: Pointer to the command buffer resource manager
 152  * @list: Caller's list of command buffer resource action
 153  *
 154  * This function reverts a list of command buffer resource
 155  * additions or removals.
 156  * It is typically called when the execbuf ioctl call triggering these
 157  * actions failed for some reason, and the command stream was never
 158  * submitted.
 159  */
 160 void vmw_cmdbuf_res_revert(struct list_head *list)
 161 {
 162         struct vmw_cmdbuf_res *entry, *next;
 163         int ret;
 164
 165         list_for_each_entry_safe(entry, next, list, head) {
 166                 switch (entry->state) {
 167                 case VMW_CMDBUF_RES_ADD:
 168                         vmw_cmdbuf_res_free(entry->man, entry);
 169                         break;
 170                 case VMW_CMDBUF_RES_DEL:
 171                         ret = drm_ht_insert_item(&entry->man->resources,
 172                                                  &entry->hash);
 173                         list_del(&entry->head);
 174                         list_add_tail(&entry->head, &entry->man->list);
 175                         entry->state = VMW_CMDBUF_RES_COMMITTED;
 176                         break;
 177                 default:
 178                         BUG();
 179                         break;
 180                 }
 181         }
 182 }
 183
 184 /**
 185  * vmw_cmdbuf_res_add - Stage a command buffer managed resource for addition.
 186  *
 187  * @man: Pointer to the command buffer resource manager.
 188  * @res_type: The resource type.
 189  * @user_key: The user-space id of the resource.
 190  * @res: Valid (refcount != 0) pointer to a struct vmw_resource.
 191  * @list: The staging list.
 192  *
 193  * This function allocates a struct vmw_cmdbuf_res entry and adds the
 194  * resource to the hash table of the manager identified by @man. The
 195  * entry is then put on the staging list identified by @list.
 196  */
 197 int vmw_cmdbuf_res_add(struct vmw_cmdbuf_res_manager *man,
 198                        enum vmw_cmdbuf_res_type res_type,
 199                        u32 user_key,
 200                        struct vmw_resource *res,
 201                        struct list_head *list)
 202 {
 203         struct vmw_cmdbuf_res *cres;
 204         int ret;
 205
 206         cres = kzalloc(sizeof(*cres), GFP_KERNEL);
 207         if (unlikely(!cres))
 208                 return -ENOMEM;
 209
 210         cres->hash.key = user_key | (res_type << 24);
 211         ret = drm_ht_insert_item(&man->resources, &cres->hash);
 212         if (unlikely(ret != 0)) {
 213                 kfree(cres);
 214                 goto out_invalid_key;
 215         }
 216
 217         cres->state = VMW_CMDBUF_RES_ADD;
 218         cres->res = vmw_resource_reference(res);
 219         cres->man = man;
 220         list_add_tail(&cres->head, list);
 221
 222 out_invalid_key:
 223         return ret;
 224 }
 225
 226 /**
 227  * vmw_cmdbuf_res_remove - Stage a command buffer managed resource for removal.
 228  *
 229  * @man: Pointer to the command buffer resource manager.
 230  * @res_type: The resource type.
 231  * @user_key: The user-space id of the resource.
 232  * @list: The staging list.
 233  * @res_p: If the resource is in an already committed state, points to the
 234  * struct vmw_resource on successful return. The pointer will be
 235  * non ref-counted.
 236  *
 237  * This function looks up the struct vmw_cmdbuf_res entry from the manager
 238  * hash table and, if it exists, removes it. Depending on its current staging
 239  * state it then either removes the entry from the staging list or adds it
 240  * to it with a staging state of removal.
 241  */
 242 int vmw_cmdbuf_res_remove(struct vmw_cmdbuf_res_manager *man,
 243                           enum vmw_cmdbuf_res_type res_type,
 244                           u32 user_key,
 245                           struct list_head *list,
 246                           struct vmw_resource **res_p)
 247 {
 248         struct vmw_cmdbuf_res *entry;
 249         struct drm_hash_item *hash;
 250         int ret;
 251
 252         ret = drm_ht_find_item(&man->resources, user_key | (res_type << 24),
 253                                &hash);
 254         if (likely(ret != 0))
 255                 return -EINVAL;
 256
 257         entry = drm_hash_entry(hash, struct vmw_cmdbuf_res, hash);
 258
 259         switch (entry->state) {
 260         case VMW_CMDBUF_RES_ADD:
 261                 vmw_cmdbuf_res_free(man, entry);
 262                 *res_p = NULL;
 263                 break;
 264         case VMW_CMDBUF_RES_COMMITTED:
 265                 (void) drm_ht_remove_item(&man->resources, &entry->hash);
 266                 list_del(&entry->head);
 267                 entry->state = VMW_CMDBUF_RES_DEL;
 268                 list_add_tail(&entry->head, list);
 269                 *res_p = entry->res;
 270                 break;
 271         default:
 272                 BUG();
 273                 break;
 274         }
 275
 276         return 0;
 277 }
 278
 279 /**
 280  * vmw_cmdbuf_res_man_create - Allocate a command buffer managed resource
 281  * manager.
 282  *
 283  * @dev_priv: Pointer to a struct vmw_private
 284  *
 285  * Allocates and initializes a command buffer managed resource manager. Returns
 286  * an error pointer on failure.
 287  */
 288 struct vmw_cmdbuf_res_manager *
 289 vmw_cmdbuf_res_man_create(struct vmw_private *dev_priv)
 290 {
 291         struct vmw_cmdbuf_res_manager *man;
 292         int ret;
 293
 294         man = kzalloc(sizeof(*man), GFP_KERNEL);
 295         if (!man)
 296                 return ERR_PTR(-ENOMEM);
 297
 298         man->dev_priv = dev_priv;
 299         INIT_LIST_HEAD(&man->list);
 300         ret = drm_ht_create(&man->resources, VMW_CMDBUF_RES_MAN_HT_ORDER);
 301         if (ret == 0)
 302                 return man;
 303
 304         kfree(man);
 305         return ERR_PTR(ret);
 306 }
 307
 308 /**
 309  * vmw_cmdbuf_res_man_destroy - Destroy a command buffer managed resource
 310  * manager.
 311  *
 312  * @man: Pointer to the  manager to destroy.
 313  *
 314  * This function destroys a command buffer managed resource manager and
 315  * unreferences / frees all command buffer managed resources and -entries
 316  * associated with it.
 317  */
 318 void vmw_cmdbuf_res_man_destroy(struct vmw_cmdbuf_res_manager *man)
 319 {
 320         struct vmw_cmdbuf_res *entry, *next;
 321
 322         list_for_each_entry_safe(entry, next, &man->list, head)
 323                 vmw_cmdbuf_res_free(man, entry);
 324
 325         drm_ht_remove(&man->resources);
 326         kfree(man);
 327 }
 328
 329 /**
 330  *
 331  * vmw_cmdbuf_res_man_size - Return the size of a command buffer managed
 332  * resource manager
 333  *
 334  * Returns the approximate allocation size of a command buffer managed
 335  * resource manager.
 336  */
 337 size_t vmw_cmdbuf_res_man_size(void)
 338 {
 339         static size_t res_man_size;
 340
 341         if (unlikely(res_man_size == 0))
 342                 res_man_size =
 343                         ttm_round_pot(sizeof(struct vmw_cmdbuf_res_manager)) +
 344                         ttm_round_pot(sizeof(struct hlist_head) <<
 345                                       VMW_CMDBUF_RES_MAN_HT_ORDER);
 346
 347         return res_man_size;
 348 }