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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/**************************************************************************3 *4 * Copyright 2016 VMware, Inc., Palo Alto, CA., USA5 *6 * Permission is hereby granted, free of charge, to any person obtaining a7 * copy of this software and associated documentation files (the8 * "Software"), to deal in the Software without restriction, including9 * without limitation the rights to use, copy, modify, merge, publish,10 * distribute, sub license, and/or sell copies of the Software, and to11 * permit persons to whom the Software is furnished to do so, subject to12 * the following conditions:13 *14 * The above copyright notice and this permission notice (including the15 * next paragraph) shall be included in all copies or substantial portions16 * of the Software.17 *18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL21 * 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 OR23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE24 * 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 struct33 *34 * @base: The TTM base object implementing user-space visibility.35 * @simple: The embedded struct vmw_simple_resource.36 */37struct vmw_user_simple_resource {38 struct ttm_base_object base;39 struct vmw_simple_resource simple;40/*41 * Nothing to be placed after @simple, since size of @simple is42 * unknown.43 */44};45 46 47/**48 * vmw_simple_resource_init - Initialize a simple resource object.49 *50 * @dev_priv: Pointer to a struct device private.51 * @simple: The struct vmw_simple_resource to initialize.52 * @data: Data passed to the information initialization function.53 * @res_free: Function pointer to destroy the simple resource.54 *55 * Returns:56 * 0 if succeeded.57 * Negative error value if error, in which case the resource will have been58 * freed.59 */60static int vmw_simple_resource_init(struct vmw_private *dev_priv,61 struct vmw_simple_resource *simple,62 void *data,63 void (*res_free)(struct vmw_resource *res))64{65 struct vmw_resource *res = &simple->res;66 int ret;67 68 ret = vmw_resource_init(dev_priv, res, false, res_free,69 &simple->func->res_func);70 71 if (ret) {72 res_free(res);73 return ret;74 }75 76 ret = simple->func->init(res, data);77 if (ret) {78 vmw_resource_unreference(&res);79 return ret;80 }81 82 simple->res.hw_destroy = simple->func->hw_destroy;83 84 return 0;85}86 87/**88 * vmw_simple_resource_free - Free a simple resource object.89 *90 * @res: The struct vmw_resource member of the simple resource object.91 *92 * Frees memory for the object.93 */94static void vmw_simple_resource_free(struct vmw_resource *res)95{96 struct vmw_user_simple_resource *usimple =97 container_of(res, struct vmw_user_simple_resource,98 simple.res);99 100 ttm_base_object_kfree(usimple, base);101}102 103/**104 * vmw_simple_resource_base_release - TTM object release callback105 *106 * @p_base: The struct ttm_base_object member of the simple resource object.107 *108 * Called when the last reference to the embedded struct ttm_base_object is109 * gone. Typically results in an object free, unless there are other110 * references to the embedded struct vmw_resource.111 */112static void vmw_simple_resource_base_release(struct ttm_base_object **p_base)113{114 struct ttm_base_object *base = *p_base;115 struct vmw_user_simple_resource *usimple =116 container_of(base, struct vmw_user_simple_resource, base);117 struct vmw_resource *res = &usimple->simple.res;118 119 *p_base = NULL;120 vmw_resource_unreference(&res);121}122 123/**124 * vmw_simple_resource_create_ioctl - Helper to set up an ioctl function to125 * create a struct vmw_simple_resource.126 *127 * @dev: Pointer to a struct drm device.128 * @data: Ioctl argument.129 * @file_priv: Pointer to a struct drm_file identifying the caller.130 * @func: Pointer to a struct vmw_simple_resource_func identifying the131 * simple resource type.132 *133 * Returns:134 * 0 if success,135 * Negative error value on error.136 */137int138vmw_simple_resource_create_ioctl(struct drm_device *dev, void *data,139 struct drm_file *file_priv,140 const struct vmw_simple_resource_func *func)141{142 struct vmw_private *dev_priv = vmw_priv(dev);143 struct vmw_user_simple_resource *usimple;144 struct vmw_resource *res;145 struct vmw_resource *tmp;146 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;147 size_t alloc_size;148 int ret;149 150 alloc_size = offsetof(struct vmw_user_simple_resource, simple) +151 func->size;152 153 usimple = kzalloc(alloc_size, GFP_KERNEL);154 if (!usimple) {155 ret = -ENOMEM;156 goto out_ret;157 }158 159 usimple->simple.func = func;160 res = &usimple->simple.res;161 usimple->base.shareable = false;162 usimple->base.tfile = NULL;163 164 /*165 * From here on, the destructor takes over resource freeing.166 */167 ret = vmw_simple_resource_init(dev_priv, &usimple->simple,168 data, vmw_simple_resource_free);169 if (ret)170 goto out_ret;171 172 tmp = vmw_resource_reference(res);173 ret = ttm_base_object_init(tfile, &usimple->base, false,174 func->ttm_res_type,175 &vmw_simple_resource_base_release);176 177 if (ret) {178 vmw_resource_unreference(&tmp);179 goto out_err;180 }181 182 func->set_arg_handle(data, usimple->base.handle);183out_err:184 vmw_resource_unreference(&res);185out_ret:186 return ret;187}188 189/**190 * vmw_simple_resource_lookup - Look up a simple resource from its user-space191 * handle.192 *193 * @tfile: struct ttm_object_file identifying the caller.194 * @handle: The user-space handle.195 * @func: The struct vmw_simple_resource_func identifying the simple resource196 * type.197 *198 * Returns: Refcounted pointer to the embedded struct vmw_resource if199 * successful. Error pointer otherwise.200 */201struct vmw_resource *202vmw_simple_resource_lookup(struct ttm_object_file *tfile,203 uint32_t handle,204 const struct vmw_simple_resource_func *func)205{206 struct vmw_user_simple_resource *usimple;207 struct ttm_base_object *base;208 struct vmw_resource *res;209 210 base = ttm_base_object_lookup(tfile, handle);211 if (!base) {212 VMW_DEBUG_USER("Invalid %s handle 0x%08lx.\n",213 func->res_func.type_name,214 (unsigned long) handle);215 return ERR_PTR(-ESRCH);216 }217 218 if (ttm_base_object_type(base) != func->ttm_res_type) {219 ttm_base_object_unref(&base);220 VMW_DEBUG_USER("Invalid type of %s handle 0x%08lx.\n",221 func->res_func.type_name,222 (unsigned long) handle);223 return ERR_PTR(-EINVAL);224 }225 226 usimple = container_of(base, typeof(*usimple), base);227 res = vmw_resource_reference(&usimple->simple.res);228 ttm_base_object_unref(&base);229 230 return res;231}232