1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3  *
4  * Copyright 2016 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 /**
32  * struct vmw_user_simple_resource - User-space simple resource struct
33  *
34  * @base: The TTM base object implementing user-space visibility.
35  * @account_size: How much memory was accounted for this object.
36  * @simple: The embedded struct vmw_simple_resource.
37  */
38 struct vmw_user_simple_resource {
39 	struct ttm_base_object base;
40 	size_t account_size;
41 	struct vmw_simple_resource simple;
42 /*
43  * Nothing to be placed after @simple, since size of @simple is
44  * unknown.
45  */
46 };
47 
48 
49 /**
50  * vmw_simple_resource_init - Initialize a simple resource object.
51  *
52  * @dev_priv: Pointer to a struct device private.
53  * @simple: The struct vmw_simple_resource to initialize.
54  * @data: Data passed to the information initialization function.
55  * @res_free: Function pointer to destroy the simple resource.
56  *
57  * Returns:
58  *   0 if succeeded.
59  *   Negative error value if error, in which case the resource will have been
60  * freed.
61  */
62 static int vmw_simple_resource_init(struct vmw_private *dev_priv,
63 				    struct vmw_simple_resource *simple,
64 				    void *data,
65 				    void (*res_free)(struct vmw_resource *res))
66 {
67 	struct vmw_resource *res = &simple->res;
68 	int ret;
69 
70 	ret = vmw_resource_init(dev_priv, res, false, res_free,
71 				&simple->func->res_func);
72 
73 	if (ret) {
74 		res_free(res);
75 		return ret;
76 	}
77 
78 	ret = simple->func->init(res, data);
79 	if (ret) {
80 		vmw_resource_unreference(&res);
81 		return ret;
82 	}
83 
84 	simple->res.hw_destroy = simple->func->hw_destroy;
85 
86 	return 0;
87 }
88 
89 /**
90  * vmw_simple_resource_free - Free a simple resource object.
91  *
92  * @res: The struct vmw_resource member of the simple resource object.
93  *
94  * Frees memory and memory accounting for the object.
95  */
96 static void vmw_simple_resource_free(struct vmw_resource *res)
97 {
98 	struct vmw_user_simple_resource *usimple =
99 		container_of(res, struct vmw_user_simple_resource,
100 			     simple.res);
101 	struct vmw_private *dev_priv = res->dev_priv;
102 	size_t size = usimple->account_size;
103 
104 	ttm_base_object_kfree(usimple, base);
105 	ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
106 }
107 
108 /**
109  * vmw_simple_resource_base_release - TTM object release callback
110  *
111  * @p_base: The struct ttm_base_object member of the simple resource object.
112  *
113  * Called when the last reference to the embedded struct ttm_base_object is
114  * gone. Typically results in an object free, unless there are other
115  * references to the embedded struct vmw_resource.
116  */
117 static void vmw_simple_resource_base_release(struct ttm_base_object **p_base)
118 {
119 	struct ttm_base_object *base = *p_base;
120 	struct vmw_user_simple_resource *usimple =
121 		container_of(base, struct vmw_user_simple_resource, base);
122 	struct vmw_resource *res = &usimple->simple.res;
123 
124 	*p_base = NULL;
125 	vmw_resource_unreference(&res);
126 }
127 
128 /**
129  * vmw_simple_resource_create_ioctl - Helper to set up an ioctl function to
130  * create a struct vmw_simple_resource.
131  *
132  * @dev: Pointer to a struct drm device.
133  * @data: Ioctl argument.
134  * @file_priv: Pointer to a struct drm_file identifying the caller.
135  * @func: Pointer to a struct vmw_simple_resource_func identifying the
136  * simple resource type.
137  *
138  * Returns:
139  *   0 if success,
140  *   Negative error value on error.
141  */
142 int
143 vmw_simple_resource_create_ioctl(struct drm_device *dev, void *data,
144 				 struct drm_file *file_priv,
145 				 const struct vmw_simple_resource_func *func)
146 {
147 	struct vmw_private *dev_priv = vmw_priv(dev);
148 	struct vmw_user_simple_resource *usimple;
149 	struct vmw_resource *res;
150 	struct vmw_resource *tmp;
151 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
152 	struct ttm_operation_ctx ctx = {
153 		.interruptible = true,
154 		.no_wait_gpu = false
155 	};
156 	size_t alloc_size;
157 	size_t account_size;
158 	int ret;
159 
160 	alloc_size = offsetof(struct vmw_user_simple_resource, simple) +
161 	  func->size;
162 	account_size = ttm_round_pot(alloc_size) + VMW_IDA_ACC_SIZE +
163 		TTM_OBJ_EXTRA_SIZE;
164 
165 	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
166 	if (ret)
167 		return ret;
168 
169 	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), account_size,
170 				   &ctx);
171 	ttm_read_unlock(&dev_priv->reservation_sem);
172 	if (ret) {
173 		if (ret != -ERESTARTSYS)
174 			DRM_ERROR("Out of graphics memory for %s"
175 				  " creation.\n", func->res_func.type_name);
176 
177 		goto out_ret;
178 	}
179 
180 	usimple = kzalloc(alloc_size, GFP_KERNEL);
181 	if (!usimple) {
182 		ttm_mem_global_free(vmw_mem_glob(dev_priv),
183 				    account_size);
184 		ret = -ENOMEM;
185 		goto out_ret;
186 	}
187 
188 	usimple->simple.func = func;
189 	usimple->account_size = account_size;
190 	res = &usimple->simple.res;
191 	usimple->base.shareable = false;
192 	usimple->base.tfile = NULL;
193 
194 	/*
195 	 * From here on, the destructor takes over resource freeing.
196 	 */
197 	ret = vmw_simple_resource_init(dev_priv, &usimple->simple,
198 				       data, vmw_simple_resource_free);
199 	if (ret)
200 		goto out_ret;
201 
202 	tmp = vmw_resource_reference(res);
203 	ret = ttm_base_object_init(tfile, &usimple->base, false,
204 				   func->ttm_res_type,
205 				   &vmw_simple_resource_base_release, NULL);
206 
207 	if (ret) {
208 		vmw_resource_unreference(&tmp);
209 		goto out_err;
210 	}
211 
212 	func->set_arg_handle(data, usimple->base.handle);
213 out_err:
214 	vmw_resource_unreference(&res);
215 out_ret:
216 	return ret;
217 }
218 
219 /**
220  * vmw_simple_resource_lookup - Look up a simple resource from its user-space
221  * handle.
222  *
223  * @tfile: struct ttm_object_file identifying the caller.
224  * @handle: The user-space handle.
225  * @func: The struct vmw_simple_resource_func identifying the simple resource
226  * type.
227  *
228  * Returns: Refcounted pointer to the embedded struct vmw_resource if
229  * successfule. Error pointer otherwise.
230  */
231 struct vmw_resource *
232 vmw_simple_resource_lookup(struct ttm_object_file *tfile,
233 			   uint32_t handle,
234 			   const struct vmw_simple_resource_func *func)
235 {
236 	struct vmw_user_simple_resource *usimple;
237 	struct ttm_base_object *base;
238 	struct vmw_resource *res;
239 
240 	base = ttm_base_object_lookup(tfile, handle);
241 	if (!base) {
242 		VMW_DEBUG_USER("Invalid %s handle 0x%08lx.\n",
243 			       func->res_func.type_name,
244 			       (unsigned long) handle);
245 		return ERR_PTR(-ESRCH);
246 	}
247 
248 	if (ttm_base_object_type(base) != func->ttm_res_type) {
249 		ttm_base_object_unref(&base);
250 		VMW_DEBUG_USER("Invalid type of %s handle 0x%08lx.\n",
251 			       func->res_func.type_name,
252 			       (unsigned long) handle);
253 		return ERR_PTR(-EINVAL);
254 	}
255 
256 	usimple = container_of(base, typeof(*usimple), base);
257 	res = vmw_resource_reference(&usimple->simple.res);
258 	ttm_base_object_unref(&base);
259 
260 	return res;
261 }
262