drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf_res.c

   1 /**************************************************************************
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   3  * Copyright © 2014 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  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.
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  26  **************************************************************************/
  27
  28 #include "vmwgfx_drv.h"
  29
  30 #define VMW_CMDBUF_RES_MAN_HT_ORDER 12
  31
  32 enum vmw_cmdbuf_res_state {
  33         VMW_CMDBUF_RES_COMMITED,
  34         VMW_CMDBUF_RES_ADD,
  35         VMW_CMDBUF_RES_DEL
  36 };
  37
  38 /**
  39  * struct vmw_cmdbuf_res - Command buffer managed resource entry.
  40  *
  41  * @res: Refcounted pointer to a struct vmw_resource.
  42  * @hash: Hash entry for the manager hash table.
  43  * @head: List head used either by the staging list or the manager list
  44  * of commited resources.
  45  * @state: Staging state of this resource entry.
  46  * @man: Pointer to a resource manager for this entry.
  47  */
  48 struct vmw_cmdbuf_res {
  49         struct vmw_resource *res;
  50         struct drm_hash_item hash;
  51         struct list_head head;
  52         enum vmw_cmdbuf_res_state state;
  53         struct vmw_cmdbuf_res_manager *man;
  54 };
  55
  56 /**
  57  * struct vmw_cmdbuf_res_manager - Command buffer resource manager.
  58  *
  59  * @resources: Hash table containing staged and commited command buffer
  60  * resources
  61  * @list: List of commited command buffer resources.
  62  * @dev_priv: Pointer to a device private structure.
  63  *
  64  * @resources and @list are protected by the cmdbuf mutex for now.
  65  */
  66 struct vmw_cmdbuf_res_manager {
  67         struct drm_open_hash resources;
  68         struct list_head list;
  69         struct vmw_private *dev_priv;
  70 };
  71
  72
  73 /**
  74  * vmw_cmdbuf_res_lookup - Look up a command buffer resource
  75  *
  76  * @man: Pointer to the command buffer resource manager
  77  * @resource_type: The resource type, that combined with the user key
  78  * identifies the resource.
  79  * @user_key: The user key.
  80  *
  81  * Returns a valid refcounted struct vmw_resource pointer on success,
  82  * an error pointer on failure.
  83  */
  84 struct vmw_resource *
  85 vmw_cmdbuf_res_lookup(struct vmw_cmdbuf_res_manager *man,
  86                       enum vmw_cmdbuf_res_type res_type,
  87                       u32 user_key)
  88 {
  89         struct drm_hash_item *hash;
  90         int ret;
  91         unsigned long key = user_key | (res_type << 24);
  92
  93         ret = drm_ht_find_item(&man->resources, key, &hash);
  94         if (unlikely(ret != 0))
  95                 return ERR_PTR(ret);
  96
  97         return vmw_resource_reference
  98                 (drm_hash_entry(hash, struct vmw_cmdbuf_res, hash)->res);
  99 }
 100
 101 /**
 102  * vmw_cmdbuf_res_free - Free a command buffer resource.
 103  *
 104  * @man: Pointer to the command buffer resource manager
 105  * @entry: Pointer to a struct vmw_cmdbuf_res.
 106  *
 107  * Frees a struct vmw_cmdbuf_res entry and drops its reference to the
 108  * struct vmw_resource.
 109  */
 110 static void vmw_cmdbuf_res_free(struct vmw_cmdbuf_res_manager *man,
 111                                 struct vmw_cmdbuf_res *entry)
 112 {
 113         list_del(&entry->head);
 114         WARN_ON(drm_ht_remove_item(&man->resources, &entry->hash));
 115         vmw_resource_unreference(&entry->res);
 116         kfree(entry);
 117 }
 118
 119 /**
 120  * vmw_cmdbuf_res_commit - Commit a list of command buffer resource actions
 121  *
 122  * @list: Caller's list of command buffer resource actions.
 123  *
 124  * This function commits a list of command buffer resource
 125  * additions or removals.
 126  * It is typically called when the execbuf ioctl call triggering these
 127  * actions has commited the fifo contents to the device.
 128  */
 129 void vmw_cmdbuf_res_commit(struct list_head *list)
 130 {
 131         struct vmw_cmdbuf_res *entry, *next;
 132
 133         list_for_each_entry_safe(entry, next, list, head) {
 134                 list_del(&entry->head);
 135                 switch (entry->state) {
 136                 case VMW_CMDBUF_RES_ADD:
 137                         entry->state = VMW_CMDBUF_RES_COMMITED;
 138                         list_add_tail(&entry->head, &entry->man->list);
 139                         break;
 140                 case VMW_CMDBUF_RES_DEL:
 141                         vmw_resource_unreference(&entry->res);
 142                         kfree(entry);
 143                         break;
 144                 default:
 145                         BUG();
 146                         break;
 147                 }
 148         }
 149 }
 150
 151 /**
 152  * vmw_cmdbuf_res_revert - Revert a list of command buffer resource actions
 153  *
 154  * @man: Pointer to the command buffer resource manager
 155  * @list: Caller's list of command buffer resource action
 156  *
 157  * This function reverts a list of command buffer resource
 158  * additions or removals.
 159  * It is typically called when the execbuf ioctl call triggering these
 160  * actions failed for some reason, and the command stream was never
 161  * submitted.
 162  */
 163 void vmw_cmdbuf_res_revert(struct list_head *list)
 164 {
 165         struct vmw_cmdbuf_res *entry, *next;
 166         int ret;
 167
 168         list_for_each_entry_safe(entry, next, list, head) {
 169                 switch (entry->state) {
 170                 case VMW_CMDBUF_RES_ADD:
 171                         vmw_cmdbuf_res_free(entry->man, entry);
 172                         break;
 173                 case VMW_CMDBUF_RES_DEL:
 174                         ret = drm_ht_insert_item(&entry->man->resources,
 175                                                  &entry->hash);
 176                         list_del(&entry->head);
 177                         list_add_tail(&entry->head, &entry->man->list);
 178                         entry->state = VMW_CMDBUF_RES_COMMITED;
 179                         break;
 180                 default:
 181                         BUG();
 182                         break;
 183                 }
 184         }
 185 }
 186
 187 /**
 188  * vmw_cmdbuf_res_add - Stage a command buffer managed resource for addition.
 189  *
 190  * @man: Pointer to the command buffer resource manager.
 191  * @res_type: The resource type.
 192  * @user_key: The user-space id of the resource.
 193  * @res: Valid (refcount != 0) pointer to a struct vmw_resource.
 194  * @list: The staging list.
 195  *
 196  * This function allocates a struct vmw_cmdbuf_res entry and adds the
 197  * resource to the hash table of the manager identified by @man. The
 198  * entry is then put on the staging list identified by @list.
 199  */
 200 int vmw_cmdbuf_res_add(struct vmw_cmdbuf_res_manager *man,
 201                        enum vmw_cmdbuf_res_type res_type,
 202                        u32 user_key,
 203                        struct vmw_resource *res,
 204                        struct list_head *list)
 205 {
 206         struct vmw_cmdbuf_res *cres;
 207         int ret;
 208
 209         cres = kzalloc(sizeof(*cres), GFP_KERNEL);
 210         if (unlikely(cres == NULL))
 211                 return -ENOMEM;
 212
 213         cres->hash.key = user_key | (res_type << 24);
 214         ret = drm_ht_insert_item(&man->resources, &cres->hash);
 215         if (unlikely(ret != 0))
 216                 goto out_invalid_key;
 217
 218         cres->state = VMW_CMDBUF_RES_ADD;
 219         cres->res = vmw_resource_reference(res);
 220         cres->man = man;
 221         list_add_tail(&cres->head, list);
 222
 223 out_invalid_key:
 224         return ret;
 225 }
 226
 227 /**
 228  * vmw_cmdbuf_res_remove - Stage a command buffer managed resource for removal.
 229  *
 230  * @man: Pointer to the command buffer resource manager.
 231  * @res_type: The resource type.
 232  * @user_key: The user-space id of the resource.
 233  * @list: The staging list.
 234  *
 235  * This function looks up the struct vmw_cmdbuf_res entry from the manager
 236  * hash table and, if it exists, removes it. Depending on its current staging
 237  * state it then either removes the entry from the staging list or adds it
 238  * to it with a staging state of removal.
 239  */
 240 int vmw_cmdbuf_res_remove(struct vmw_cmdbuf_res_manager *man,
 241                           enum vmw_cmdbuf_res_type res_type,
 242                           u32 user_key,
 243                           struct list_head *list)
 244 {
 245         struct vmw_cmdbuf_res *entry;
 246         struct drm_hash_item *hash;
 247         int ret;
 248
 249         ret = drm_ht_find_item(&man->resources, user_key | (res_type << 24),
 250                                &hash);
 251         if (likely(ret != 0))
 252                 return -EINVAL;
 253
 254         entry = drm_hash_entry(hash, struct vmw_cmdbuf_res, hash);
 255
 256         switch (entry->state) {
 257         case VMW_CMDBUF_RES_ADD:
 258                 vmw_cmdbuf_res_free(man, entry);
 259                 break;
 260         case VMW_CMDBUF_RES_COMMITED:
 261                 (void) drm_ht_remove_item(&man->resources, &entry->hash);
 262                 list_del(&entry->head);
 263                 entry->state = VMW_CMDBUF_RES_DEL;
 264                 list_add_tail(&entry->head, list);
 265                 break;
 266         default:
 267                 BUG();
 268                 break;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /**
 275  * vmw_cmdbuf_res_man_create - Allocate a command buffer managed resource
 276  * manager.
 277  *
 278  * @dev_priv: Pointer to a struct vmw_private
 279  *
 280  * Allocates and initializes a command buffer managed resource manager. Returns
 281  * an error pointer on failure.
 282  */
 283 struct vmw_cmdbuf_res_manager *
 284 vmw_cmdbuf_res_man_create(struct vmw_private *dev_priv)
 285 {
 286         struct vmw_cmdbuf_res_manager *man;
 287         int ret;
 288
 289         man = kzalloc(sizeof(*man), GFP_KERNEL);
 290         if (man == NULL)
 291                 return ERR_PTR(-ENOMEM);
 292
 293         man->dev_priv = dev_priv;
 294         INIT_LIST_HEAD(&man->list);
 295         ret = drm_ht_create(&man->resources, VMW_CMDBUF_RES_MAN_HT_ORDER);
 296         if (ret == 0)
 297                 return man;
 298
 299         kfree(man);
 300         return ERR_PTR(ret);
 301 }
 302
 303 /**
 304  * vmw_cmdbuf_res_man_destroy - Destroy a command buffer managed resource
 305  * manager.
 306  *
 307  * @man: Pointer to the  manager to destroy.
 308  *
 309  * This function destroys a command buffer managed resource manager and
 310  * unreferences / frees all command buffer managed resources and -entries
 311  * associated with it.
 312  */
 313 void vmw_cmdbuf_res_man_destroy(struct vmw_cmdbuf_res_manager *man)
 314 {
 315         struct vmw_cmdbuf_res *entry, *next;
 316
 317         list_for_each_entry_safe(entry, next, &man->list, head)
 318                 vmw_cmdbuf_res_free(man, entry);
 319
 320         kfree(man);
 321 }
 322
 323 /**
 324  *
 325  * vmw_cmdbuf_res_man_size - Return the size of a command buffer managed
 326  * resource manager
 327  *
 328  * Returns the approximate allocation size of a command buffer managed
 329  * resource manager.
 330  */
 331 size_t vmw_cmdbuf_res_man_size(void)
 332 {
 333         static size_t res_man_size;
 334
 335         if (unlikely(res_man_size == 0))
 336                 res_man_size =
 337                         ttm_round_pot(sizeof(struct vmw_cmdbuf_res_manager)) +
 338                         ttm_round_pot(sizeof(struct hlist_head) <<
 339                                       VMW_CMDBUF_RES_MAN_HT_ORDER);
 340
 341         return res_man_size;
 342 }