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
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11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
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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.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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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  * @res_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  * @list: Caller's list of command buffer resource action
152  *
153  * This function reverts a list of command buffer resource
154  * additions or removals.
155  * It is typically called when the execbuf ioctl call triggering these
156  * actions failed for some reason, and the command stream was never
157  * submitted.
158  */
159 void vmw_cmdbuf_res_revert(struct list_head *list)
160 {
161 	struct vmw_cmdbuf_res *entry, *next;
162 	int ret;
163 
164 	list_for_each_entry_safe(entry, next, list, head) {
165 		switch (entry->state) {
166 		case VMW_CMDBUF_RES_ADD:
167 			vmw_cmdbuf_res_free(entry->man, entry);
168 			break;
169 		case VMW_CMDBUF_RES_DEL:
170 			ret = drm_ht_insert_item(&entry->man->resources, &entry->hash);
171 			BUG_ON(ret);
172 			list_move_tail(&entry->head, &entry->man->list);
173 			entry->state = VMW_CMDBUF_RES_COMMITTED;
174 			break;
175 		default:
176 			BUG();
177 			break;
178 		}
179 	}
180 }
181 
182 /**
183  * vmw_cmdbuf_res_add - Stage a command buffer managed resource for addition.
184  *
185  * @man: Pointer to the command buffer resource manager.
186  * @res_type: The resource type.
187  * @user_key: The user-space id of the resource.
188  * @res: Valid (refcount != 0) pointer to a struct vmw_resource.
189  * @list: The staging list.
190  *
191  * This function allocates a struct vmw_cmdbuf_res entry and adds the
192  * resource to the hash table of the manager identified by @man. The
193  * entry is then put on the staging list identified by @list.
194  */
195 int vmw_cmdbuf_res_add(struct vmw_cmdbuf_res_manager *man,
196 		       enum vmw_cmdbuf_res_type res_type,
197 		       u32 user_key,
198 		       struct vmw_resource *res,
199 		       struct list_head *list)
200 {
201 	struct vmw_cmdbuf_res *cres;
202 	int ret;
203 
204 	cres = kzalloc(sizeof(*cres), GFP_KERNEL);
205 	if (unlikely(!cres))
206 		return -ENOMEM;
207 
208 	cres->hash.key = user_key | (res_type << 24);
209 	ret = drm_ht_insert_item(&man->resources, &cres->hash);
210 	if (unlikely(ret != 0)) {
211 		kfree(cres);
212 		goto out_invalid_key;
213 	}
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  */
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 *
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  */
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  * vmw_cmdbuf_res_man_size - Return the size of a command buffer managed
329  * resource manager
330  *
331  * Returns the approximate allocation size of a command buffer managed
332  * resource manager.
333  */
334 size_t vmw_cmdbuf_res_man_size(void)
335 {
336 	static size_t res_man_size;
337 
338 	if (unlikely(res_man_size == 0))
339 		res_man_size =
340 			ttm_round_pot(sizeof(struct vmw_cmdbuf_res_manager)) +
341 			ttm_round_pot(sizeof(struct hlist_head) <<
342 				      VMW_CMDBUF_RES_MAN_HT_ORDER);
343 
344 	return res_man_size;
345 }
346