Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2012 Red Hat |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the next |
| 12 | * paragraph) shall be included in all copies or substantial portions of the |
| 13 | * Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 21 | * IN THE SOFTWARE. |
| 22 | * |
| 23 | * Authors: |
| 24 | * Dave Airlie <airlied@redhat.com> |
| 25 | * Rob Clark <rob.clark@linaro.org> |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #include <linux/export.h> |
| 30 | #include <linux/dma-buf.h> |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 31 | #include <drm/drmP.h> |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 32 | |
| 33 | /* |
| 34 | * DMA-BUF/GEM Object references and lifetime overview: |
| 35 | * |
| 36 | * On the export the dma_buf holds a reference to the exporting GEM |
| 37 | * object. It takes this reference in handle_to_fd_ioctl, when it |
| 38 | * first calls .prime_export and stores the exporting GEM object in |
| 39 | * the dma_buf priv. This reference is released when the dma_buf |
| 40 | * object goes away in the driver .release function. |
| 41 | * |
| 42 | * On the import the importing GEM object holds a reference to the |
| 43 | * dma_buf (which in turn holds a ref to the exporting GEM object). |
| 44 | * It takes that reference in the fd_to_handle ioctl. |
| 45 | * It calls dma_buf_get, creates an attachment to it and stores the |
| 46 | * attachment in the GEM object. When this attachment is destroyed |
| 47 | * when the imported object is destroyed, we remove the attachment |
| 48 | * and drop the reference to the dma_buf. |
| 49 | * |
| 50 | * Thus the chain of references always flows in one direction |
| 51 | * (avoiding loops): importing_gem -> dmabuf -> exporting_gem |
| 52 | * |
| 53 | * Self-importing: if userspace is using PRIME as a replacement for flink |
| 54 | * then it will get a fd->handle request for a GEM object that it created. |
| 55 | * Drivers should detect this situation and return back the gem object |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 56 | * from the dma-buf private. Prime will do this automatically for drivers that |
| 57 | * use the drm_gem_prime_{import,export} helpers. |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 58 | */ |
| 59 | |
| 60 | struct drm_prime_member { |
| 61 | struct list_head entry; |
| 62 | struct dma_buf *dma_buf; |
| 63 | uint32_t handle; |
| 64 | }; |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 65 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 66 | |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 67 | static int drm_gem_map_attach(struct dma_buf *dma_buf, |
| 68 | struct device *target_dev, |
| 69 | struct dma_buf_attachment *attach) |
| 70 | { |
| 71 | struct drm_gem_object *obj = dma_buf->priv; |
| 72 | struct drm_device *dev = obj->dev; |
| 73 | |
| 74 | if (!dev->driver->gem_prime_pin) |
| 75 | return 0; |
| 76 | |
| 77 | return dev->driver->gem_prime_pin(obj); |
| 78 | } |
| 79 | |
| 80 | static void drm_gem_map_detach(struct dma_buf *dma_buf, |
| 81 | struct dma_buf_attachment *attach) |
| 82 | { |
| 83 | struct drm_gem_object *obj = dma_buf->priv; |
| 84 | struct drm_device *dev = obj->dev; |
| 85 | |
| 86 | if (dev->driver->gem_prime_unpin) |
| 87 | dev->driver->gem_prime_unpin(obj); |
| 88 | } |
| 89 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 90 | static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
| 91 | enum dma_data_direction dir) |
| 92 | { |
| 93 | struct drm_gem_object *obj = attach->dmabuf->priv; |
| 94 | struct sg_table *sgt; |
| 95 | |
| 96 | mutex_lock(&obj->dev->struct_mutex); |
| 97 | |
| 98 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); |
| 99 | |
| 100 | if (!IS_ERR_OR_NULL(sgt)) |
| 101 | dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir); |
| 102 | |
| 103 | mutex_unlock(&obj->dev->struct_mutex); |
| 104 | return sgt; |
| 105 | } |
| 106 | |
| 107 | static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, |
| 108 | struct sg_table *sgt, enum dma_data_direction dir) |
| 109 | { |
| 110 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir); |
| 111 | sg_free_table(sgt); |
| 112 | kfree(sgt); |
| 113 | } |
| 114 | |
| 115 | static void drm_gem_dmabuf_release(struct dma_buf *dma_buf) |
| 116 | { |
| 117 | struct drm_gem_object *obj = dma_buf->priv; |
| 118 | |
| 119 | if (obj->export_dma_buf == dma_buf) { |
| 120 | /* drop the reference on the export fd holds */ |
| 121 | obj->export_dma_buf = NULL; |
| 122 | drm_gem_object_unreference_unlocked(obj); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
| 127 | { |
| 128 | struct drm_gem_object *obj = dma_buf->priv; |
| 129 | struct drm_device *dev = obj->dev; |
| 130 | |
| 131 | return dev->driver->gem_prime_vmap(obj); |
| 132 | } |
| 133 | |
| 134 | static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) |
| 135 | { |
| 136 | struct drm_gem_object *obj = dma_buf->priv; |
| 137 | struct drm_device *dev = obj->dev; |
| 138 | |
| 139 | dev->driver->gem_prime_vunmap(obj, vaddr); |
| 140 | } |
| 141 | |
| 142 | static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, |
| 143 | unsigned long page_num) |
| 144 | { |
| 145 | return NULL; |
| 146 | } |
| 147 | |
| 148 | static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, |
| 149 | unsigned long page_num, void *addr) |
| 150 | { |
| 151 | |
| 152 | } |
| 153 | static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, |
| 154 | unsigned long page_num) |
| 155 | { |
| 156 | return NULL; |
| 157 | } |
| 158 | |
| 159 | static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, |
| 160 | unsigned long page_num, void *addr) |
| 161 | { |
| 162 | |
| 163 | } |
| 164 | |
| 165 | static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, |
| 166 | struct vm_area_struct *vma) |
| 167 | { |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | |
| 171 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 172 | .attach = drm_gem_map_attach, |
| 173 | .detach = drm_gem_map_detach, |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 174 | .map_dma_buf = drm_gem_map_dma_buf, |
| 175 | .unmap_dma_buf = drm_gem_unmap_dma_buf, |
| 176 | .release = drm_gem_dmabuf_release, |
| 177 | .kmap = drm_gem_dmabuf_kmap, |
| 178 | .kmap_atomic = drm_gem_dmabuf_kmap_atomic, |
| 179 | .kunmap = drm_gem_dmabuf_kunmap, |
| 180 | .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic, |
| 181 | .mmap = drm_gem_dmabuf_mmap, |
| 182 | .vmap = drm_gem_dmabuf_vmap, |
| 183 | .vunmap = drm_gem_dmabuf_vunmap, |
| 184 | }; |
| 185 | |
| 186 | /** |
| 187 | * DOC: PRIME Helpers |
| 188 | * |
| 189 | * Drivers can implement @gem_prime_export and @gem_prime_import in terms of |
| 190 | * simpler APIs by using the helper functions @drm_gem_prime_export and |
| 191 | * @drm_gem_prime_import. These functions implement dma-buf support in terms of |
| 192 | * five lower-level driver callbacks: |
| 193 | * |
| 194 | * Export callbacks: |
| 195 | * |
| 196 | * - @gem_prime_pin (optional): prepare a GEM object for exporting |
| 197 | * |
| 198 | * - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages |
| 199 | * |
| 200 | * - @gem_prime_vmap: vmap a buffer exported by your driver |
| 201 | * |
| 202 | * - @gem_prime_vunmap: vunmap a buffer exported by your driver |
| 203 | * |
| 204 | * Import callback: |
| 205 | * |
| 206 | * - @gem_prime_import_sg_table (import): produce a GEM object from another |
| 207 | * driver's scatter/gather table |
| 208 | */ |
| 209 | |
| 210 | struct dma_buf *drm_gem_prime_export(struct drm_device *dev, |
| 211 | struct drm_gem_object *obj, int flags) |
| 212 | { |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 213 | return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, |
Maarten Lankhorst | 102d6db | 2013-04-09 09:18:44 +0200 | [diff] [blame] | 214 | 0600); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 215 | } |
| 216 | EXPORT_SYMBOL(drm_gem_prime_export); |
| 217 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 218 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
| 219 | struct drm_file *file_priv, uint32_t handle, uint32_t flags, |
| 220 | int *prime_fd) |
| 221 | { |
| 222 | struct drm_gem_object *obj; |
| 223 | void *buf; |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 224 | int ret = 0; |
| 225 | struct dma_buf *dmabuf; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 226 | |
| 227 | obj = drm_gem_object_lookup(dev, file_priv, handle); |
| 228 | if (!obj) |
| 229 | return -ENOENT; |
| 230 | |
| 231 | mutex_lock(&file_priv->prime.lock); |
| 232 | /* re-export the original imported object */ |
| 233 | if (obj->import_attach) { |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 234 | dmabuf = obj->import_attach->dmabuf; |
| 235 | goto out_have_obj; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | if (obj->export_dma_buf) { |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 239 | dmabuf = obj->export_dma_buf; |
| 240 | goto out_have_obj; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 241 | } |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 242 | |
| 243 | buf = dev->driver->gem_prime_export(dev, obj, flags); |
| 244 | if (IS_ERR(buf)) { |
| 245 | /* normally the created dma-buf takes ownership of the ref, |
| 246 | * but if that fails then drop the ref |
| 247 | */ |
| 248 | ret = PTR_ERR(buf); |
| 249 | goto out; |
| 250 | } |
| 251 | obj->export_dma_buf = buf; |
| 252 | |
Dave Airlie | 0ff926c | 2012-05-20 17:31:16 +0100 | [diff] [blame] | 253 | /* if we've exported this buffer the cheat and add it to the import list |
| 254 | * so we get the correct handle back |
| 255 | */ |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 256 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
| 257 | obj->export_dma_buf, handle); |
| 258 | if (ret) |
| 259 | goto out; |
Dave Airlie | 0ff926c | 2012-05-20 17:31:16 +0100 | [diff] [blame] | 260 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 261 | *prime_fd = dma_buf_fd(buf, flags); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 262 | mutex_unlock(&file_priv->prime.lock); |
| 263 | return 0; |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 264 | |
| 265 | out_have_obj: |
| 266 | get_dma_buf(dmabuf); |
| 267 | *prime_fd = dma_buf_fd(dmabuf, flags); |
| 268 | out: |
| 269 | drm_gem_object_unreference_unlocked(obj); |
| 270 | mutex_unlock(&file_priv->prime.lock); |
| 271 | return ret; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 272 | } |
| 273 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); |
| 274 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 275 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
| 276 | struct dma_buf *dma_buf) |
| 277 | { |
| 278 | struct dma_buf_attachment *attach; |
| 279 | struct sg_table *sgt; |
| 280 | struct drm_gem_object *obj; |
| 281 | int ret; |
| 282 | |
| 283 | if (!dev->driver->gem_prime_import_sg_table) |
| 284 | return ERR_PTR(-EINVAL); |
| 285 | |
| 286 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { |
| 287 | obj = dma_buf->priv; |
| 288 | if (obj->dev == dev) { |
| 289 | /* |
| 290 | * Importing dmabuf exported from out own gem increases |
| 291 | * refcount on gem itself instead of f_count of dmabuf. |
| 292 | */ |
| 293 | drm_gem_object_reference(obj); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 294 | return obj; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | attach = dma_buf_attach(dma_buf, dev->dev); |
| 299 | if (IS_ERR(attach)) |
| 300 | return ERR_PTR(PTR_ERR(attach)); |
| 301 | |
Imre Deak | 011c228 | 2013-04-19 11:11:56 +1000 | [diff] [blame] | 302 | get_dma_buf(dma_buf); |
| 303 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 304 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
| 305 | if (IS_ERR_OR_NULL(sgt)) { |
| 306 | ret = PTR_ERR(sgt); |
| 307 | goto fail_detach; |
| 308 | } |
| 309 | |
| 310 | obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt); |
| 311 | if (IS_ERR(obj)) { |
| 312 | ret = PTR_ERR(obj); |
| 313 | goto fail_unmap; |
| 314 | } |
| 315 | |
| 316 | obj->import_attach = attach; |
| 317 | |
| 318 | return obj; |
| 319 | |
| 320 | fail_unmap: |
| 321 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); |
| 322 | fail_detach: |
| 323 | dma_buf_detach(dma_buf, attach); |
Imre Deak | 011c228 | 2013-04-19 11:11:56 +1000 | [diff] [blame] | 324 | dma_buf_put(dma_buf); |
| 325 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 326 | return ERR_PTR(ret); |
| 327 | } |
| 328 | EXPORT_SYMBOL(drm_gem_prime_import); |
| 329 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 330 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
| 331 | struct drm_file *file_priv, int prime_fd, uint32_t *handle) |
| 332 | { |
| 333 | struct dma_buf *dma_buf; |
| 334 | struct drm_gem_object *obj; |
| 335 | int ret; |
| 336 | |
| 337 | dma_buf = dma_buf_get(prime_fd); |
| 338 | if (IS_ERR(dma_buf)) |
| 339 | return PTR_ERR(dma_buf); |
| 340 | |
| 341 | mutex_lock(&file_priv->prime.lock); |
| 342 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 343 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 344 | dma_buf, handle); |
| 345 | if (!ret) { |
| 346 | ret = 0; |
| 347 | goto out_put; |
| 348 | } |
| 349 | |
| 350 | /* never seen this one, need to import */ |
| 351 | obj = dev->driver->gem_prime_import(dev, dma_buf); |
| 352 | if (IS_ERR(obj)) { |
| 353 | ret = PTR_ERR(obj); |
| 354 | goto out_put; |
| 355 | } |
| 356 | |
| 357 | ret = drm_gem_handle_create(file_priv, obj, handle); |
| 358 | drm_gem_object_unreference_unlocked(obj); |
| 359 | if (ret) |
| 360 | goto out_put; |
| 361 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 362 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 363 | dma_buf, *handle); |
| 364 | if (ret) |
| 365 | goto fail; |
| 366 | |
| 367 | mutex_unlock(&file_priv->prime.lock); |
Imre Deak | 011c228 | 2013-04-19 11:11:56 +1000 | [diff] [blame] | 368 | |
| 369 | dma_buf_put(dma_buf); |
| 370 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 371 | return 0; |
| 372 | |
| 373 | fail: |
| 374 | /* hmm, if driver attached, we are relying on the free-object path |
| 375 | * to detach.. which seems ok.. |
| 376 | */ |
| 377 | drm_gem_object_handle_unreference_unlocked(obj); |
| 378 | out_put: |
| 379 | dma_buf_put(dma_buf); |
| 380 | mutex_unlock(&file_priv->prime.lock); |
| 381 | return ret; |
| 382 | } |
| 383 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); |
| 384 | |
| 385 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, |
| 386 | struct drm_file *file_priv) |
| 387 | { |
| 388 | struct drm_prime_handle *args = data; |
| 389 | uint32_t flags; |
| 390 | |
| 391 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) |
| 392 | return -EINVAL; |
| 393 | |
| 394 | if (!dev->driver->prime_handle_to_fd) |
| 395 | return -ENOSYS; |
| 396 | |
| 397 | /* check flags are valid */ |
| 398 | if (args->flags & ~DRM_CLOEXEC) |
| 399 | return -EINVAL; |
| 400 | |
| 401 | /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */ |
| 402 | flags = args->flags & DRM_CLOEXEC; |
| 403 | |
| 404 | return dev->driver->prime_handle_to_fd(dev, file_priv, |
| 405 | args->handle, flags, &args->fd); |
| 406 | } |
| 407 | |
| 408 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, |
| 409 | struct drm_file *file_priv) |
| 410 | { |
| 411 | struct drm_prime_handle *args = data; |
| 412 | |
| 413 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) |
| 414 | return -EINVAL; |
| 415 | |
| 416 | if (!dev->driver->prime_fd_to_handle) |
| 417 | return -ENOSYS; |
| 418 | |
| 419 | return dev->driver->prime_fd_to_handle(dev, file_priv, |
| 420 | args->fd, &args->handle); |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * drm_prime_pages_to_sg |
| 425 | * |
| 426 | * this helper creates an sg table object from a set of pages |
| 427 | * the driver is responsible for mapping the pages into the |
| 428 | * importers address space |
| 429 | */ |
| 430 | struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages) |
| 431 | { |
| 432 | struct sg_table *sg = NULL; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 433 | int ret; |
| 434 | |
| 435 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); |
| 436 | if (!sg) |
| 437 | goto out; |
| 438 | |
Rahul Sharma | dca25cb | 2013-01-28 08:38:48 -0500 | [diff] [blame] | 439 | ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
| 440 | nr_pages << PAGE_SHIFT, GFP_KERNEL); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 441 | if (ret) |
| 442 | goto out; |
| 443 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 444 | return sg; |
| 445 | out: |
| 446 | kfree(sg); |
| 447 | return NULL; |
| 448 | } |
| 449 | EXPORT_SYMBOL(drm_prime_pages_to_sg); |
| 450 | |
Dave Airlie | 51ab7ba | 2012-05-18 15:40:33 +0100 | [diff] [blame] | 451 | /* export an sg table into an array of pages and addresses |
| 452 | this is currently required by the TTM driver in order to do correct fault |
| 453 | handling */ |
| 454 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, |
| 455 | dma_addr_t *addrs, int max_pages) |
| 456 | { |
| 457 | unsigned count; |
| 458 | struct scatterlist *sg; |
| 459 | struct page *page; |
| 460 | u32 len, offset; |
| 461 | int pg_index; |
| 462 | dma_addr_t addr; |
| 463 | |
| 464 | pg_index = 0; |
| 465 | for_each_sg(sgt->sgl, sg, sgt->nents, count) { |
| 466 | len = sg->length; |
| 467 | offset = sg->offset; |
| 468 | page = sg_page(sg); |
| 469 | addr = sg_dma_address(sg); |
| 470 | |
| 471 | while (len > 0) { |
| 472 | if (WARN_ON(pg_index >= max_pages)) |
| 473 | return -1; |
| 474 | pages[pg_index] = page; |
| 475 | if (addrs) |
| 476 | addrs[pg_index] = addr; |
| 477 | |
| 478 | page++; |
| 479 | addr += PAGE_SIZE; |
| 480 | len -= PAGE_SIZE; |
| 481 | pg_index++; |
| 482 | } |
| 483 | } |
| 484 | return 0; |
| 485 | } |
| 486 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 487 | /* helper function to cleanup a GEM/prime object */ |
| 488 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) |
| 489 | { |
| 490 | struct dma_buf_attachment *attach; |
| 491 | struct dma_buf *dma_buf; |
| 492 | attach = obj->import_attach; |
| 493 | if (sg) |
| 494 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
| 495 | dma_buf = attach->dmabuf; |
| 496 | dma_buf_detach(attach->dmabuf, attach); |
| 497 | /* remove the reference */ |
| 498 | dma_buf_put(dma_buf); |
| 499 | } |
| 500 | EXPORT_SYMBOL(drm_prime_gem_destroy); |
| 501 | |
| 502 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) |
| 503 | { |
| 504 | INIT_LIST_HEAD(&prime_fpriv->head); |
| 505 | mutex_init(&prime_fpriv->lock); |
| 506 | } |
| 507 | EXPORT_SYMBOL(drm_prime_init_file_private); |
| 508 | |
| 509 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) |
| 510 | { |
Imre Deak | 98b7623 | 2013-04-24 19:04:57 +0300 | [diff] [blame] | 511 | /* by now drm_gem_release should've made sure the list is empty */ |
| 512 | WARN_ON(!list_empty(&prime_fpriv->head)); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 513 | } |
| 514 | EXPORT_SYMBOL(drm_prime_destroy_file_private); |
| 515 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 516 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle) |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 517 | { |
| 518 | struct drm_prime_member *member; |
| 519 | |
| 520 | member = kmalloc(sizeof(*member), GFP_KERNEL); |
| 521 | if (!member) |
| 522 | return -ENOMEM; |
| 523 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 524 | get_dma_buf(dma_buf); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 525 | member->dma_buf = dma_buf; |
| 526 | member->handle = handle; |
| 527 | list_add(&member->entry, &prime_fpriv->head); |
| 528 | return 0; |
| 529 | } |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 530 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 531 | int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t *handle) |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 532 | { |
| 533 | struct drm_prime_member *member; |
| 534 | |
| 535 | list_for_each_entry(member, &prime_fpriv->head, entry) { |
| 536 | if (member->dma_buf == dma_buf) { |
| 537 | *handle = member->handle; |
| 538 | return 0; |
| 539 | } |
| 540 | } |
| 541 | return -ENOENT; |
| 542 | } |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 543 | EXPORT_SYMBOL(drm_prime_lookup_buf_handle); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 544 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 545 | void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf) |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 546 | { |
| 547 | struct drm_prime_member *member, *safe; |
| 548 | |
| 549 | mutex_lock(&prime_fpriv->lock); |
| 550 | list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) { |
| 551 | if (member->dma_buf == dma_buf) { |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 552 | dma_buf_put(dma_buf); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 553 | list_del(&member->entry); |
| 554 | kfree(member); |
| 555 | } |
| 556 | } |
| 557 | mutex_unlock(&prime_fpriv->lock); |
| 558 | } |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 559 | EXPORT_SYMBOL(drm_prime_remove_buf_handle); |