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 */
 38struct 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 */
 62static 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 */
 96static 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 */
117static 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 */
142int
143vmw_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);
213out_err:
214	vmw_resource_unreference(&res);
215out_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 */
231struct vmw_resource *
232vmw_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}