drm_agp_hook.c revision 1.3.2.2
1 1.3.2.2 pgoyette /* $NetBSD: drm_agp_hook.c,v 1.3.2.2 2018/09/06 06:56:35 pgoyette Exp $ */ 2 1.3.2.2 pgoyette 3 1.3.2.2 pgoyette /*- 4 1.3.2.2 pgoyette * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 1.3.2.2 pgoyette * All rights reserved. 6 1.3.2.2 pgoyette * 7 1.3.2.2 pgoyette * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 pgoyette * by Taylor R. Campbell. 9 1.3.2.2 pgoyette * 10 1.3.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 pgoyette * modification, are permitted provided that the following conditions 12 1.3.2.2 pgoyette * are met: 13 1.3.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 pgoyette * documentation and/or other materials provided with the distribution. 18 1.3.2.2 pgoyette * 19 1.3.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 pgoyette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 pgoyette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 pgoyette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 pgoyette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 pgoyette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 pgoyette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 pgoyette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 pgoyette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 pgoyette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 pgoyette * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 pgoyette */ 31 1.3.2.2 pgoyette 32 1.3.2.2 pgoyette #include <sys/cdefs.h> 33 1.3.2.2 pgoyette __KERNEL_RCSID(0, "$NetBSD: drm_agp_hook.c,v 1.3.2.2 2018/09/06 06:56:35 pgoyette Exp $"); 34 1.3.2.2 pgoyette 35 1.3.2.2 pgoyette #include <sys/types.h> 36 1.3.2.2 pgoyette #include <sys/condvar.h> 37 1.3.2.2 pgoyette #include <sys/errno.h> 38 1.3.2.2 pgoyette #include <sys/mutex.h> 39 1.3.2.2 pgoyette #include <sys/once.h> 40 1.3.2.2 pgoyette 41 1.3.2.2 pgoyette #include <drm/drmP.h> 42 1.3.2.2 pgoyette #include <drm/drm_internal.h> 43 1.3.2.2 pgoyette 44 1.3.2.2 pgoyette static struct { 45 1.3.2.2 pgoyette kmutex_t lock; 46 1.3.2.2 pgoyette kcondvar_t cv; 47 1.3.2.2 pgoyette unsigned refcnt; /* at most one per device */ 48 1.3.2.2 pgoyette const struct drm_agp_hooks *hooks; 49 1.3.2.2 pgoyette } agp_hooks __cacheline_aligned; 50 1.3.2.2 pgoyette 51 1.3.2.2 pgoyette void 52 1.3.2.2 pgoyette drm_agp_hooks_init(void) 53 1.3.2.2 pgoyette { 54 1.3.2.2 pgoyette 55 1.3.2.2 pgoyette mutex_init(&agp_hooks.lock, MUTEX_DEFAULT, IPL_NONE); 56 1.3.2.2 pgoyette cv_init(&agp_hooks.cv, "agphooks"); 57 1.3.2.2 pgoyette agp_hooks.refcnt = 0; 58 1.3.2.2 pgoyette agp_hooks.hooks = NULL; 59 1.3.2.2 pgoyette } 60 1.3.2.2 pgoyette 61 1.3.2.2 pgoyette void 62 1.3.2.2 pgoyette drm_agp_hooks_fini(void) 63 1.3.2.2 pgoyette { 64 1.3.2.2 pgoyette 65 1.3.2.2 pgoyette KASSERT(agp_hooks.hooks == NULL); 66 1.3.2.2 pgoyette KASSERT(agp_hooks.refcnt == 0); 67 1.3.2.2 pgoyette cv_destroy(&agp_hooks.cv); 68 1.3.2.2 pgoyette mutex_destroy(&agp_hooks.lock); 69 1.3.2.2 pgoyette } 70 1.3.2.2 pgoyette 71 1.3.2.2 pgoyette int 72 1.3.2.2 pgoyette drm_agp_register(const struct drm_agp_hooks *hooks) 73 1.3.2.2 pgoyette { 74 1.3.2.2 pgoyette int error = 0; 75 1.3.2.2 pgoyette 76 1.3.2.2 pgoyette mutex_enter(&agp_hooks.lock); 77 1.3.2.2 pgoyette if (agp_hooks.refcnt) { 78 1.3.2.2 pgoyette KASSERT(agp_hooks.hooks); 79 1.3.2.2 pgoyette error = EBUSY; 80 1.3.2.2 pgoyette } else { 81 1.3.2.2 pgoyette agp_hooks.refcnt++; 82 1.3.2.2 pgoyette agp_hooks.hooks = hooks; 83 1.3.2.2 pgoyette } 84 1.3.2.2 pgoyette mutex_exit(&agp_hooks.lock); 85 1.3.2.2 pgoyette 86 1.3.2.2 pgoyette return error; 87 1.3.2.2 pgoyette } 88 1.3.2.2 pgoyette 89 1.3.2.2 pgoyette int 90 1.3.2.2 pgoyette drm_agp_deregister(const struct drm_agp_hooks *hooks) 91 1.3.2.2 pgoyette { 92 1.3.2.2 pgoyette int error = 0; 93 1.3.2.2 pgoyette 94 1.3.2.2 pgoyette mutex_enter(&agp_hooks.lock); 95 1.3.2.2 pgoyette KASSERT(agp_hooks.hooks == hooks); 96 1.3.2.2 pgoyette if (agp_hooks.refcnt > 1) { 97 1.3.2.2 pgoyette error = EBUSY; 98 1.3.2.2 pgoyette } else { 99 1.3.2.2 pgoyette agp_hooks.refcnt = 0; 100 1.3.2.2 pgoyette agp_hooks.hooks = NULL; 101 1.3.2.2 pgoyette } 102 1.3.2.2 pgoyette mutex_exit(&agp_hooks.lock); 103 1.3.2.2 pgoyette 104 1.3.2.2 pgoyette return error; 105 1.3.2.2 pgoyette } 106 1.3.2.2 pgoyette 107 1.3.2.2 pgoyette static const struct drm_agp_hooks * 108 1.3.2.2 pgoyette drm_agp_hooks_acquire(void) 109 1.3.2.2 pgoyette { 110 1.3.2.2 pgoyette const struct drm_agp_hooks *hooks; 111 1.3.2.2 pgoyette 112 1.3.2.2 pgoyette mutex_enter(&agp_hooks.lock); 113 1.3.2.2 pgoyette if (agp_hooks.refcnt == 0) { 114 1.3.2.2 pgoyette hooks = NULL; 115 1.3.2.2 pgoyette } else { 116 1.3.2.2 pgoyette KASSERT(agp_hooks.refcnt < UINT_MAX); 117 1.3.2.2 pgoyette agp_hooks.refcnt++; 118 1.3.2.2 pgoyette hooks = agp_hooks.hooks; 119 1.3.2.2 pgoyette } 120 1.3.2.2 pgoyette mutex_exit(&agp_hooks.lock); 121 1.3.2.2 pgoyette 122 1.3.2.2 pgoyette return hooks; 123 1.3.2.2 pgoyette } 124 1.3.2.2 pgoyette 125 1.3.2.2 pgoyette static void 126 1.3.2.2 pgoyette drm_agp_hooks_release(const struct drm_agp_hooks *hooks) 127 1.3.2.2 pgoyette { 128 1.3.2.2 pgoyette 129 1.3.2.2 pgoyette mutex_enter(&agp_hooks.lock); 130 1.3.2.2 pgoyette KASSERT(agp_hooks.hooks == hooks); 131 1.3.2.2 pgoyette KASSERT(agp_hooks.refcnt); 132 1.3.2.2 pgoyette if (--agp_hooks.refcnt == 0) 133 1.3.2.2 pgoyette cv_broadcast(&agp_hooks.cv); 134 1.3.2.2 pgoyette mutex_exit(&agp_hooks.lock); 135 1.3.2.2 pgoyette } 136 1.3.2.2 pgoyette 137 1.3.2.2 pgoyette struct drm_agp_head * 138 1.3.2.2 pgoyette drm_agp_init(struct drm_device *dev) 139 1.3.2.2 pgoyette { 140 1.3.2.2 pgoyette const struct drm_agp_hooks *hooks; 141 1.3.2.2 pgoyette struct drm_agp_head *agp; 142 1.3.2.2 pgoyette 143 1.3.2.2 pgoyette if ((hooks = drm_agp_hooks_acquire()) == NULL) 144 1.3.2.2 pgoyette return NULL; 145 1.3.2.2 pgoyette agp = hooks->agph_init(dev); 146 1.3.2.2 pgoyette if (agp == NULL) 147 1.3.2.2 pgoyette drm_agp_hooks_release(hooks); 148 1.3.2.2 pgoyette else 149 1.3.2.2 pgoyette agp->hooks = hooks; 150 1.3.2.2 pgoyette 151 1.3.2.2 pgoyette return agp; 152 1.3.2.2 pgoyette } 153 1.3.2.2 pgoyette 154 1.3.2.2 pgoyette void 155 1.3.2.2 pgoyette drm_agp_fini(struct drm_device *dev) 156 1.3.2.2 pgoyette { 157 1.3.2.2 pgoyette 158 1.3.2.2 pgoyette if (dev->agp == NULL) 159 1.3.2.2 pgoyette return; 160 1.3.2.2 pgoyette dev->agp->hooks->agph_clear(dev); 161 1.3.2.2 pgoyette drm_agp_hooks_release(dev->agp->hooks); 162 1.3.2.2 pgoyette kfree(dev->agp); 163 1.3.2.2 pgoyette dev->agp = NULL; 164 1.3.2.2 pgoyette } 165 1.3.2.2 pgoyette 166 1.3.2.2 pgoyette void 167 1.3.2.2 pgoyette drm_agp_clear(struct drm_device *dev) 168 1.3.2.2 pgoyette { 169 1.3.2.2 pgoyette 170 1.3.2.2 pgoyette if (dev->agp == NULL) 171 1.3.2.2 pgoyette return; 172 1.3.2.2 pgoyette dev->agp->hooks->agph_clear(dev); 173 1.3.2.2 pgoyette } 174 1.3.2.2 pgoyette 175 1.3.2.2 pgoyette int 176 1.3.2.2 pgoyette drm_agp_acquire(struct drm_device *dev) 177 1.3.2.2 pgoyette { 178 1.3.2.2 pgoyette 179 1.3.2.2 pgoyette if (dev->agp == NULL) 180 1.3.2.2 pgoyette return -ENODEV; 181 1.3.2.2 pgoyette return dev->agp->hooks->agph_acquire(dev); 182 1.3.2.2 pgoyette } 183 1.3.2.2 pgoyette 184 1.3.2.2 pgoyette int 185 1.3.2.2 pgoyette drm_agp_release(struct drm_device *dev) 186 1.3.2.2 pgoyette { 187 1.3.2.2 pgoyette 188 1.3.2.2 pgoyette if (dev->agp == NULL) 189 1.3.2.2 pgoyette return -EINVAL; 190 1.3.2.2 pgoyette return dev->agp->hooks->agph_release(dev); 191 1.3.2.2 pgoyette } 192 1.3.2.2 pgoyette 193 1.3.2.2 pgoyette int 194 1.3.2.2 pgoyette drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode) 195 1.3.2.2 pgoyette { 196 1.3.2.2 pgoyette 197 1.3.2.2 pgoyette if (dev->agp == NULL) 198 1.3.2.2 pgoyette return -EINVAL; 199 1.3.2.2 pgoyette return dev->agp->hooks->agph_enable(dev, mode); 200 1.3.2.2 pgoyette } 201 1.3.2.2 pgoyette 202 1.3.2.2 pgoyette int 203 1.3.2.2 pgoyette drm_agp_info(struct drm_device *dev, struct drm_agp_info *info) 204 1.3.2.2 pgoyette { 205 1.3.2.2 pgoyette 206 1.3.2.2 pgoyette if (dev->agp == NULL) 207 1.3.2.2 pgoyette return -EINVAL; 208 1.3.2.2 pgoyette return dev->agp->hooks->agph_info(dev, info); 209 1.3.2.2 pgoyette } 210 1.3.2.2 pgoyette 211 1.3.2.2 pgoyette int 212 1.3.2.2 pgoyette drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request) 213 1.3.2.2 pgoyette { 214 1.3.2.2 pgoyette 215 1.3.2.2 pgoyette if (dev->agp == NULL) 216 1.3.2.2 pgoyette return -EINVAL; 217 1.3.2.2 pgoyette return dev->agp->hooks->agph_alloc(dev, request); 218 1.3.2.2 pgoyette } 219 1.3.2.2 pgoyette 220 1.3.2.2 pgoyette int 221 1.3.2.2 pgoyette drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request) 222 1.3.2.2 pgoyette { 223 1.3.2.2 pgoyette 224 1.3.2.2 pgoyette if (dev->agp == NULL) 225 1.3.2.2 pgoyette return -EINVAL; 226 1.3.2.2 pgoyette return dev->agp->hooks->agph_free(dev, request); 227 1.3.2.2 pgoyette } 228 1.3.2.2 pgoyette 229 1.3.2.2 pgoyette int 230 1.3.2.2 pgoyette drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request) 231 1.3.2.2 pgoyette { 232 1.3.2.2 pgoyette 233 1.3.2.2 pgoyette if (dev->agp == NULL) 234 1.3.2.2 pgoyette return -EINVAL; 235 1.3.2.2 pgoyette return dev->agp->hooks->agph_bind(dev, request); 236 1.3.2.2 pgoyette } 237 1.3.2.2 pgoyette 238 1.3.2.2 pgoyette int 239 1.3.2.2 pgoyette drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request) 240 1.3.2.2 pgoyette { 241 1.3.2.2 pgoyette 242 1.3.2.2 pgoyette if (dev->agp == NULL) 243 1.3.2.2 pgoyette return -EINVAL; 244 1.3.2.2 pgoyette return dev->agp->hooks->agph_unbind(dev, request); 245 1.3.2.2 pgoyette } 246 1.3.2.2 pgoyette 247 1.3.2.2 pgoyette #define DEFINE_AGP_HOOK_IOCTL(NAME, FIELD) \ 248 1.3.2.2 pgoyette int \ 249 1.3.2.2 pgoyette NAME(struct drm_device *dev, void *data, struct drm_file *file) \ 250 1.3.2.2 pgoyette { \ 251 1.3.2.2 pgoyette \ 252 1.3.2.2 pgoyette if (dev->agp == NULL) \ 253 1.3.2.2 pgoyette return -ENODEV; \ 254 1.3.2.2 pgoyette return dev->agp->hooks->FIELD(dev, data, file); \ 255 1.3.2.2 pgoyette } 256 1.3.2.2 pgoyette 257 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_acquire_ioctl, agph_acquire_ioctl) 258 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_release_ioctl, agph_release_ioctl) 259 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_enable_ioctl, agph_enable_ioctl) 260 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_info_ioctl, agph_info_ioctl) 261 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_alloc_ioctl, agph_alloc_ioctl) 262 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_free_ioctl, agph_free_ioctl) 263 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_bind_ioctl, agph_bind_ioctl) 264 1.3.2.2 pgoyette DEFINE_AGP_HOOK_IOCTL(drm_agp_unbind_ioctl, agph_unbind_ioctl) 265 1.3.2.2 pgoyette 266 1.3.2.2 pgoyette void __pci_iomem * 267 1.3.2.2 pgoyette drm_agp_borrow(struct drm_device *dev, unsigned bar, bus_size_t size) 268 1.3.2.2 pgoyette { 269 1.3.2.2 pgoyette const struct drm_agp_hooks *hooks; 270 1.3.2.2 pgoyette void __pci_iomem *iomem; 271 1.3.2.2 pgoyette 272 1.3.2.2 pgoyette if ((hooks = drm_agp_hooks_acquire()) == NULL) 273 1.3.2.2 pgoyette return NULL; 274 1.3.2.2 pgoyette iomem = hooks->agph_borrow(dev, bar, size); 275 1.3.2.2 pgoyette drm_agp_hooks_release(hooks); 276 1.3.2.2 pgoyette 277 1.3.2.2 pgoyette return iomem; 278 1.3.2.2 pgoyette } 279 1.3.2.2 pgoyette 280 1.3.2.2 pgoyette void 281 1.3.2.2 pgoyette drm_agp_flush(void) 282 1.3.2.2 pgoyette { 283 1.3.2.2 pgoyette const struct drm_agp_hooks *hooks; 284 1.3.2.2 pgoyette 285 1.3.2.2 pgoyette if ((hooks = drm_agp_hooks_acquire()) == NULL) 286 1.3.2.2 pgoyette return; 287 1.3.2.2 pgoyette hooks->agph_flush(); 288 1.3.2.2 pgoyette drm_agp_hooks_release(hooks); 289 1.3.2.2 pgoyette } 290
Indexes created Fri Oct 03 02:09:57 GMT 2025