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 *
vmw_cmdbuf_res_lookup(struct vmw_cmdbuf_res_manager * man,enum vmw_cmdbuf_res_type res_type,u32 user_key)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 */
vmw_cmdbuf_res_free(struct vmw_cmdbuf_res_manager * man,struct vmw_cmdbuf_res * entry)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 */
vmw_cmdbuf_res_commit(struct list_head * list)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 */
vmw_cmdbuf_res_revert(struct list_head * list)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 */
vmw_cmdbuf_res_add(struct vmw_cmdbuf_res_manager * man,enum vmw_cmdbuf_res_type res_type,u32 user_key,struct vmw_resource * res,struct list_head * list)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 goto out_invalid_key;
214
215 cres->state = VMW_CMDBUF_RES_ADD;
216 cres->res = vmw_resource_reference(res);
217 cres->man = man;
218 list_add_tail(&cres->head, list);
219
220 out_invalid_key:
221 return ret;
222 }
223
224 /**
225 * vmw_cmdbuf_res_remove - Stage a command buffer managed resource for removal.
226 *
227 * @man: Pointer to the command buffer resource manager.
228 * @res_type: The resource type.
229 * @user_key: The user-space id of the resource.
230 * @list: The staging list.
231 * @res_p: If the resource is in an already committed state, points to the
232 * struct vmw_resource on successful return. The pointer will be
233 * non ref-counted.
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 */
vmw_cmdbuf_res_remove(struct vmw_cmdbuf_res_manager * man,enum vmw_cmdbuf_res_type res_type,u32 user_key,struct list_head * list,struct vmw_resource ** res_p)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 struct vmw_resource **res_p)
245 {
246 struct vmw_cmdbuf_res *entry;
247 struct drm_hash_item *hash;
248 int ret;
249
250 ret = drm_ht_find_item(&man->resources, user_key | (res_type << 24),
251 &hash);
252 if (likely(ret != 0))
253 return -EINVAL;
254
255 entry = drm_hash_entry(hash, struct vmw_cmdbuf_res, hash);
256
257 switch (entry->state) {
258 case VMW_CMDBUF_RES_ADD:
259 vmw_cmdbuf_res_free(man, entry);
260 *res_p = NULL;
261 break;
262 case VMW_CMDBUF_RES_COMMITTED:
263 (void) drm_ht_remove_item(&man->resources, &entry->hash);
264 list_del(&entry->head);
265 entry->state = VMW_CMDBUF_RES_DEL;
266 list_add_tail(&entry->head, list);
267 *res_p = entry->res;
268 break;
269 default:
270 BUG();
271 break;
272 }
273
274 return 0;
275 }
276
277 /**
278 * vmw_cmdbuf_res_man_create - Allocate a command buffer managed resource
279 * manager.
280 *
281 * @dev_priv: Pointer to a struct vmw_private
282 *
283 * Allocates and initializes a command buffer managed resource manager. Returns
284 * an error pointer on failure.
285 */
286 struct vmw_cmdbuf_res_manager *
vmw_cmdbuf_res_man_create(struct vmw_private * dev_priv)287 vmw_cmdbuf_res_man_create(struct vmw_private *dev_priv)
288 {
289 struct vmw_cmdbuf_res_manager *man;
290 int ret;
291
292 man = kzalloc(sizeof(*man), GFP_KERNEL);
293 if (!man)
294 return ERR_PTR(-ENOMEM);
295
296 man->dev_priv = dev_priv;
297 INIT_LIST_HEAD(&man->list);
298 ret = drm_ht_create(&man->resources, VMW_CMDBUF_RES_MAN_HT_ORDER);
299 if (ret == 0)
300 return man;
301
302 kfree(man);
303 return ERR_PTR(ret);
304 }
305
306 /**
307 * vmw_cmdbuf_res_man_destroy - Destroy a command buffer managed resource
308 * manager.
309 *
310 * @man: Pointer to the manager to destroy.
311 *
312 * This function destroys a command buffer managed resource manager and
313 * unreferences / frees all command buffer managed resources and -entries
314 * associated with it.
315 */
vmw_cmdbuf_res_man_destroy(struct vmw_cmdbuf_res_manager * man)316 void vmw_cmdbuf_res_man_destroy(struct vmw_cmdbuf_res_manager *man)
317 {
318 struct vmw_cmdbuf_res *entry, *next;
319
320 list_for_each_entry_safe(entry, next, &man->list, head)
321 vmw_cmdbuf_res_free(man, entry);
322
323 drm_ht_remove(&man->resources);
324 kfree(man);
325 }
326
327 /**
328 *
329 * vmw_cmdbuf_res_man_size - Return the size of a command buffer managed
330 * resource manager
331 *
332 * Returns the approximate allocation size of a command buffer managed
333 * resource manager.
334 */
vmw_cmdbuf_res_man_size(void)335 size_t vmw_cmdbuf_res_man_size(void)
336 {
337 static size_t res_man_size;
338
339 if (unlikely(res_man_size == 0))
340 res_man_size =
341 ttm_round_pot(sizeof(struct vmw_cmdbuf_res_manager)) +
342 ttm_round_pot(sizeof(struct hlist_head) <<
343 VMW_CMDBUF_RES_MAN_HT_ORDER);
344
345 return res_man_size;
346 }
347
