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> |
Daniel Vetter | 67d0ec4 | 2014-09-10 12:43:53 +0200 | [diff] [blame] | 32 | #include "drm_internal.h" |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 33 | |
| 34 | /* |
| 35 | * DMA-BUF/GEM Object references and lifetime overview: |
| 36 | * |
| 37 | * On the export the dma_buf holds a reference to the exporting GEM |
| 38 | * object. It takes this reference in handle_to_fd_ioctl, when it |
| 39 | * first calls .prime_export and stores the exporting GEM object in |
| 40 | * the dma_buf priv. This reference is released when the dma_buf |
| 41 | * object goes away in the driver .release function. |
| 42 | * |
| 43 | * On the import the importing GEM object holds a reference to the |
| 44 | * dma_buf (which in turn holds a ref to the exporting GEM object). |
| 45 | * It takes that reference in the fd_to_handle ioctl. |
| 46 | * It calls dma_buf_get, creates an attachment to it and stores the |
| 47 | * attachment in the GEM object. When this attachment is destroyed |
| 48 | * when the imported object is destroyed, we remove the attachment |
| 49 | * and drop the reference to the dma_buf. |
| 50 | * |
| 51 | * Thus the chain of references always flows in one direction |
| 52 | * (avoiding loops): importing_gem -> dmabuf -> exporting_gem |
| 53 | * |
| 54 | * Self-importing: if userspace is using PRIME as a replacement for flink |
| 55 | * then it will get a fd->handle request for a GEM object that it created. |
| 56 | * Drivers should detect this situation and return back the gem object |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 57 | * from the dma-buf private. Prime will do this automatically for drivers that |
| 58 | * use the drm_gem_prime_{import,export} helpers. |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 59 | */ |
| 60 | |
| 61 | struct drm_prime_member { |
| 62 | struct list_head entry; |
| 63 | struct dma_buf *dma_buf; |
| 64 | uint32_t handle; |
| 65 | }; |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 66 | |
| 67 | struct drm_prime_attachment { |
| 68 | struct sg_table *sgt; |
| 69 | enum dma_data_direction dir; |
| 70 | }; |
| 71 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 72 | static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, |
| 73 | struct dma_buf *dma_buf, uint32_t handle) |
Seung-Woo Kim | ce92e3c | 2013-06-26 10:21:41 +0900 | [diff] [blame] | 74 | { |
| 75 | struct drm_prime_member *member; |
| 76 | |
| 77 | member = kmalloc(sizeof(*member), GFP_KERNEL); |
| 78 | if (!member) |
| 79 | return -ENOMEM; |
| 80 | |
| 81 | get_dma_buf(dma_buf); |
| 82 | member->dma_buf = dma_buf; |
| 83 | member->handle = handle; |
| 84 | list_add(&member->entry, &prime_fpriv->head); |
| 85 | return 0; |
| 86 | } |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 87 | |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 88 | static struct dma_buf *drm_prime_lookup_buf_by_handle(struct drm_prime_file_private *prime_fpriv, |
| 89 | uint32_t handle) |
| 90 | { |
| 91 | struct drm_prime_member *member; |
| 92 | |
| 93 | list_for_each_entry(member, &prime_fpriv->head, entry) { |
| 94 | if (member->handle == handle) |
| 95 | return member->dma_buf; |
| 96 | } |
| 97 | |
| 98 | return NULL; |
| 99 | } |
| 100 | |
Daniel Vetter | de9564d | 2013-08-15 00:02:48 +0200 | [diff] [blame] | 101 | static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpriv, |
| 102 | struct dma_buf *dma_buf, |
| 103 | uint32_t *handle) |
| 104 | { |
| 105 | struct drm_prime_member *member; |
| 106 | |
| 107 | list_for_each_entry(member, &prime_fpriv->head, entry) { |
| 108 | if (member->dma_buf == dma_buf) { |
| 109 | *handle = member->handle; |
| 110 | return 0; |
| 111 | } |
| 112 | } |
| 113 | return -ENOENT; |
| 114 | } |
| 115 | |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 116 | static int drm_gem_map_attach(struct dma_buf *dma_buf, |
| 117 | struct device *target_dev, |
| 118 | struct dma_buf_attachment *attach) |
| 119 | { |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 120 | struct drm_prime_attachment *prime_attach; |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 121 | struct drm_gem_object *obj = dma_buf->priv; |
| 122 | struct drm_device *dev = obj->dev; |
| 123 | |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 124 | prime_attach = kzalloc(sizeof(*prime_attach), GFP_KERNEL); |
| 125 | if (!prime_attach) |
| 126 | return -ENOMEM; |
| 127 | |
| 128 | prime_attach->dir = DMA_NONE; |
| 129 | attach->priv = prime_attach; |
| 130 | |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 131 | if (!dev->driver->gem_prime_pin) |
| 132 | return 0; |
| 133 | |
| 134 | return dev->driver->gem_prime_pin(obj); |
| 135 | } |
| 136 | |
| 137 | static void drm_gem_map_detach(struct dma_buf *dma_buf, |
| 138 | struct dma_buf_attachment *attach) |
| 139 | { |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 140 | struct drm_prime_attachment *prime_attach = attach->priv; |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 141 | struct drm_gem_object *obj = dma_buf->priv; |
| 142 | struct drm_device *dev = obj->dev; |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 143 | struct sg_table *sgt; |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 144 | |
| 145 | if (dev->driver->gem_prime_unpin) |
| 146 | dev->driver->gem_prime_unpin(obj); |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 147 | |
| 148 | if (!prime_attach) |
| 149 | return; |
| 150 | |
| 151 | sgt = prime_attach->sgt; |
Joonyoung Shim | f9d8a12 | 2013-07-04 16:19:12 +0900 | [diff] [blame] | 152 | if (sgt) { |
| 153 | if (prime_attach->dir != DMA_NONE) |
| 154 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, |
| 155 | prime_attach->dir); |
| 156 | sg_free_table(sgt); |
| 157 | } |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 158 | |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 159 | kfree(sgt); |
| 160 | kfree(prime_attach); |
| 161 | attach->priv = NULL; |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 162 | } |
| 163 | |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 164 | void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, |
| 165 | struct dma_buf *dma_buf) |
YoungJun Cho | da34242 | 2013-06-26 10:21:42 +0900 | [diff] [blame] | 166 | { |
| 167 | struct drm_prime_member *member, *safe; |
| 168 | |
| 169 | list_for_each_entry_safe(member, safe, &prime_fpriv->head, entry) { |
| 170 | if (member->dma_buf == dma_buf) { |
| 171 | dma_buf_put(dma_buf); |
| 172 | list_del(&member->entry); |
| 173 | kfree(member); |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 178 | static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 179 | enum dma_data_direction dir) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 180 | { |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 181 | struct drm_prime_attachment *prime_attach = attach->priv; |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 182 | struct drm_gem_object *obj = attach->dmabuf->priv; |
| 183 | struct sg_table *sgt; |
| 184 | |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 185 | if (WARN_ON(dir == DMA_NONE || !prime_attach)) |
| 186 | return ERR_PTR(-EINVAL); |
| 187 | |
| 188 | /* return the cached mapping when possible */ |
| 189 | if (prime_attach->dir == dir) |
| 190 | return prime_attach->sgt; |
| 191 | |
| 192 | /* |
| 193 | * two mappings with different directions for the same attachment are |
| 194 | * not allowed |
| 195 | */ |
| 196 | if (WARN_ON(prime_attach->dir != DMA_NONE)) |
| 197 | return ERR_PTR(-EBUSY); |
| 198 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 199 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); |
| 200 | |
YoungJun Cho | 7e3d88f | 2013-06-24 16:40:53 +0900 | [diff] [blame] | 201 | if (!IS_ERR(sgt)) { |
YoungJun Cho | b720d54 | 2013-06-24 15:34:21 +0900 | [diff] [blame] | 202 | if (!dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir)) { |
| 203 | sg_free_table(sgt); |
| 204 | kfree(sgt); |
| 205 | sgt = ERR_PTR(-ENOMEM); |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 206 | } else { |
| 207 | prime_attach->sgt = sgt; |
| 208 | prime_attach->dir = dir; |
YoungJun Cho | b720d54 | 2013-06-24 15:34:21 +0900 | [diff] [blame] | 209 | } |
| 210 | } |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 211 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 212 | return sgt; |
| 213 | } |
| 214 | |
| 215 | static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 216 | struct sg_table *sgt, |
| 217 | enum dma_data_direction dir) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 218 | { |
Joonyoung Shim | 538d666 | 2013-06-19 15:03:05 +0900 | [diff] [blame] | 219 | /* nothing to be done here */ |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 220 | } |
| 221 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 222 | /** |
| 223 | * drm_gem_dmabuf_release - dma_buf release implementation for GEM |
| 224 | * @dma_buf: buffer to be released |
| 225 | * |
| 226 | * Generic release function for dma_bufs exported as PRIME buffers. GEM drivers |
| 227 | * must use this in their dma_buf ops structure as the release callback. |
| 228 | */ |
Daniel Vetter | c1d6798 | 2013-08-15 00:02:30 +0200 | [diff] [blame] | 229 | void drm_gem_dmabuf_release(struct dma_buf *dma_buf) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 230 | { |
| 231 | struct drm_gem_object *obj = dma_buf->priv; |
| 232 | |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 233 | /* drop the reference on the export fd holds */ |
| 234 | drm_gem_object_unreference_unlocked(obj); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 235 | } |
Daniel Vetter | c1d6798 | 2013-08-15 00:02:30 +0200 | [diff] [blame] | 236 | EXPORT_SYMBOL(drm_gem_dmabuf_release); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 237 | |
| 238 | static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf) |
| 239 | { |
| 240 | struct drm_gem_object *obj = dma_buf->priv; |
| 241 | struct drm_device *dev = obj->dev; |
| 242 | |
| 243 | return dev->driver->gem_prime_vmap(obj); |
| 244 | } |
| 245 | |
| 246 | static void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) |
| 247 | { |
| 248 | struct drm_gem_object *obj = dma_buf->priv; |
| 249 | struct drm_device *dev = obj->dev; |
| 250 | |
| 251 | dev->driver->gem_prime_vunmap(obj, vaddr); |
| 252 | } |
| 253 | |
| 254 | static void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 255 | unsigned long page_num) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 256 | { |
| 257 | return NULL; |
| 258 | } |
| 259 | |
| 260 | static void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 261 | unsigned long page_num, void *addr) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 262 | { |
| 263 | |
| 264 | } |
| 265 | static void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 266 | unsigned long page_num) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 267 | { |
| 268 | return NULL; |
| 269 | } |
| 270 | |
| 271 | static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 272 | unsigned long page_num, void *addr) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 273 | { |
| 274 | |
| 275 | } |
| 276 | |
| 277 | static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 278 | struct vm_area_struct *vma) |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 279 | { |
Joonyoung Shim | 7c397cd | 2013-06-28 14:24:53 +0900 | [diff] [blame] | 280 | struct drm_gem_object *obj = dma_buf->priv; |
| 281 | struct drm_device *dev = obj->dev; |
| 282 | |
| 283 | if (!dev->driver->gem_prime_mmap) |
| 284 | return -ENOSYS; |
| 285 | |
| 286 | return dev->driver->gem_prime_mmap(obj, vma); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { |
Maarten Lankhorst | ca793f7 | 2013-04-09 09:52:54 +0200 | [diff] [blame] | 290 | .attach = drm_gem_map_attach, |
| 291 | .detach = drm_gem_map_detach, |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 292 | .map_dma_buf = drm_gem_map_dma_buf, |
| 293 | .unmap_dma_buf = drm_gem_unmap_dma_buf, |
| 294 | .release = drm_gem_dmabuf_release, |
| 295 | .kmap = drm_gem_dmabuf_kmap, |
| 296 | .kmap_atomic = drm_gem_dmabuf_kmap_atomic, |
| 297 | .kunmap = drm_gem_dmabuf_kunmap, |
| 298 | .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic, |
| 299 | .mmap = drm_gem_dmabuf_mmap, |
| 300 | .vmap = drm_gem_dmabuf_vmap, |
| 301 | .vunmap = drm_gem_dmabuf_vunmap, |
| 302 | }; |
| 303 | |
| 304 | /** |
| 305 | * DOC: PRIME Helpers |
| 306 | * |
| 307 | * Drivers can implement @gem_prime_export and @gem_prime_import in terms of |
| 308 | * simpler APIs by using the helper functions @drm_gem_prime_export and |
| 309 | * @drm_gem_prime_import. These functions implement dma-buf support in terms of |
| 310 | * five lower-level driver callbacks: |
| 311 | * |
| 312 | * Export callbacks: |
| 313 | * |
| 314 | * - @gem_prime_pin (optional): prepare a GEM object for exporting |
| 315 | * |
| 316 | * - @gem_prime_get_sg_table: provide a scatter/gather table of pinned pages |
| 317 | * |
| 318 | * - @gem_prime_vmap: vmap a buffer exported by your driver |
| 319 | * |
| 320 | * - @gem_prime_vunmap: vunmap a buffer exported by your driver |
| 321 | * |
| 322 | * Import callback: |
| 323 | * |
| 324 | * - @gem_prime_import_sg_table (import): produce a GEM object from another |
| 325 | * driver's scatter/gather table |
| 326 | */ |
| 327 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 328 | /** |
| 329 | * drm_gem_prime_export - helper library implemention of the export callback |
| 330 | * @dev: drm_device to export from |
| 331 | * @obj: GEM object to export |
| 332 | * @flags: flags like DRM_CLOEXEC |
| 333 | * |
| 334 | * This is the implementation of the gem_prime_export functions for GEM drivers |
| 335 | * using the PRIME helpers. |
| 336 | */ |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 337 | struct dma_buf *drm_gem_prime_export(struct drm_device *dev, |
| 338 | struct drm_gem_object *obj, int flags) |
| 339 | { |
Maarten Lankhorst | 3aac450 | 2014-07-01 12:57:26 +0200 | [diff] [blame] | 340 | struct reservation_object *robj = NULL; |
| 341 | |
| 342 | if (dev->driver->gem_prime_res_obj) |
| 343 | robj = dev->driver->gem_prime_res_obj(obj); |
| 344 | |
| 345 | return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size, |
| 346 | flags, robj); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 347 | } |
| 348 | EXPORT_SYMBOL(drm_gem_prime_export); |
| 349 | |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 350 | static struct dma_buf *export_and_register_object(struct drm_device *dev, |
| 351 | struct drm_gem_object *obj, |
| 352 | uint32_t flags) |
| 353 | { |
| 354 | struct dma_buf *dmabuf; |
| 355 | |
| 356 | /* prevent races with concurrent gem_close. */ |
| 357 | if (obj->handle_count == 0) { |
| 358 | dmabuf = ERR_PTR(-ENOENT); |
| 359 | return dmabuf; |
| 360 | } |
| 361 | |
| 362 | dmabuf = dev->driver->gem_prime_export(dev, obj, flags); |
| 363 | if (IS_ERR(dmabuf)) { |
| 364 | /* normally the created dma-buf takes ownership of the ref, |
| 365 | * but if that fails then drop the ref |
| 366 | */ |
| 367 | return dmabuf; |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | * Note that callers do not need to clean up the export cache |
| 372 | * since the check for obj->handle_count guarantees that someone |
| 373 | * will clean it up. |
| 374 | */ |
| 375 | obj->dma_buf = dmabuf; |
| 376 | get_dma_buf(obj->dma_buf); |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 377 | /* Grab a new ref since the callers is now used by the dma-buf */ |
| 378 | drm_gem_object_reference(obj); |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 379 | |
| 380 | return dmabuf; |
| 381 | } |
| 382 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 383 | /** |
| 384 | * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers |
| 385 | * @dev: dev to export the buffer from |
| 386 | * @file_priv: drm file-private structure |
| 387 | * @handle: buffer handle to export |
| 388 | * @flags: flags like DRM_CLOEXEC |
| 389 | * @prime_fd: pointer to storage for the fd id of the create dma-buf |
| 390 | * |
| 391 | * This is the PRIME export function which must be used mandatorily by GEM |
| 392 | * drivers to ensure correct lifetime management of the underlying GEM object. |
| 393 | * The actual exporting from GEM object to a dma-buf is done through the |
| 394 | * gem_prime_export driver callback. |
| 395 | */ |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 396 | int drm_gem_prime_handle_to_fd(struct drm_device *dev, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 397 | struct drm_file *file_priv, uint32_t handle, |
| 398 | uint32_t flags, |
| 399 | int *prime_fd) |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 400 | { |
| 401 | struct drm_gem_object *obj; |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 402 | int ret = 0; |
| 403 | struct dma_buf *dmabuf; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 404 | |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 405 | mutex_lock(&file_priv->prime.lock); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 406 | obj = drm_gem_object_lookup(dev, file_priv, handle); |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 407 | if (!obj) { |
| 408 | ret = -ENOENT; |
| 409 | goto out_unlock; |
| 410 | } |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 411 | |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 412 | dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle); |
| 413 | if (dmabuf) { |
| 414 | get_dma_buf(dmabuf); |
| 415 | goto out_have_handle; |
| 416 | } |
| 417 | |
| 418 | mutex_lock(&dev->object_name_lock); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 419 | /* re-export the original imported object */ |
| 420 | if (obj->import_attach) { |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 421 | dmabuf = obj->import_attach->dmabuf; |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 422 | get_dma_buf(dmabuf); |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 423 | goto out_have_obj; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 424 | } |
| 425 | |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 426 | if (obj->dma_buf) { |
| 427 | get_dma_buf(obj->dma_buf); |
| 428 | dmabuf = obj->dma_buf; |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 429 | goto out_have_obj; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 430 | } |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 431 | |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 432 | dmabuf = export_and_register_object(dev, obj, flags); |
Daniel Vetter | 4332bf4 | 2013-08-15 00:02:41 +0200 | [diff] [blame] | 433 | if (IS_ERR(dmabuf)) { |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 434 | /* normally the created dma-buf takes ownership of the ref, |
| 435 | * but if that fails then drop the ref |
| 436 | */ |
Daniel Vetter | 4332bf4 | 2013-08-15 00:02:41 +0200 | [diff] [blame] | 437 | ret = PTR_ERR(dmabuf); |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 438 | mutex_unlock(&dev->object_name_lock); |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 439 | goto out; |
| 440 | } |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 441 | |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 442 | out_have_obj: |
| 443 | /* |
| 444 | * If we've exported this buffer then cheat and add it to the import list |
| 445 | * so we get the correct handle back. We must do this under the |
| 446 | * protection of dev->object_name_lock to ensure that a racing gem close |
| 447 | * ioctl doesn't miss to remove this buffer handle from the cache. |
Dave Airlie | 0ff926c | 2012-05-20 17:31:16 +0100 | [diff] [blame] | 448 | */ |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 449 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 450 | dmabuf, handle); |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 451 | mutex_unlock(&dev->object_name_lock); |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 452 | if (ret) |
YoungJun Cho | 7d8f06a | 2013-06-26 10:21:40 +0900 | [diff] [blame] | 453 | goto fail_put_dmabuf; |
Dave Airlie | 0ff926c | 2012-05-20 17:31:16 +0100 | [diff] [blame] | 454 | |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 455 | out_have_handle: |
Daniel Vetter | 4332bf4 | 2013-08-15 00:02:41 +0200 | [diff] [blame] | 456 | ret = dma_buf_fd(dmabuf, flags); |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 457 | /* |
| 458 | * We must _not_ remove the buffer from the handle cache since the newly |
| 459 | * created dma buf is already linked in the global obj->dma_buf pointer, |
| 460 | * and that is invariant as long as a userspace gem handle exists. |
| 461 | * Closing the handle will clean out the cache anyway, so we don't leak. |
| 462 | */ |
Daniel Vetter | 4a88f73 | 2013-07-02 09:18:39 +0200 | [diff] [blame] | 463 | if (ret < 0) { |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 464 | goto fail_put_dmabuf; |
Daniel Vetter | 4a88f73 | 2013-07-02 09:18:39 +0200 | [diff] [blame] | 465 | } else { |
YoungJun Cho | da34242 | 2013-06-26 10:21:42 +0900 | [diff] [blame] | 466 | *prime_fd = ret; |
Daniel Vetter | 4a88f73 | 2013-07-02 09:18:39 +0200 | [diff] [blame] | 467 | ret = 0; |
| 468 | } |
| 469 | |
YoungJun Cho | 7d8f06a | 2013-06-26 10:21:40 +0900 | [diff] [blame] | 470 | goto out; |
| 471 | |
| 472 | fail_put_dmabuf: |
Daniel Vetter | 4332bf4 | 2013-08-15 00:02:41 +0200 | [diff] [blame] | 473 | dma_buf_put(dmabuf); |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 474 | out: |
| 475 | drm_gem_object_unreference_unlocked(obj); |
Daniel Vetter | d0b2c53 | 2013-08-15 00:02:49 +0200 | [diff] [blame] | 476 | out_unlock: |
| 477 | mutex_unlock(&file_priv->prime.lock); |
| 478 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 479 | return ret; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 480 | } |
| 481 | EXPORT_SYMBOL(drm_gem_prime_handle_to_fd); |
| 482 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 483 | /** |
| 484 | * drm_gem_prime_import - helper library implemention of the import callback |
| 485 | * @dev: drm_device to import into |
| 486 | * @dma_buf: dma-buf object to import |
| 487 | * |
| 488 | * This is the implementation of the gem_prime_import functions for GEM drivers |
| 489 | * using the PRIME helpers. |
| 490 | */ |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 491 | struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev, |
| 492 | struct dma_buf *dma_buf) |
| 493 | { |
| 494 | struct dma_buf_attachment *attach; |
| 495 | struct sg_table *sgt; |
| 496 | struct drm_gem_object *obj; |
| 497 | int ret; |
| 498 | |
| 499 | if (!dev->driver->gem_prime_import_sg_table) |
| 500 | return ERR_PTR(-EINVAL); |
| 501 | |
| 502 | if (dma_buf->ops == &drm_gem_prime_dmabuf_ops) { |
| 503 | obj = dma_buf->priv; |
| 504 | if (obj->dev == dev) { |
| 505 | /* |
| 506 | * Importing dmabuf exported from out own gem increases |
| 507 | * refcount on gem itself instead of f_count of dmabuf. |
| 508 | */ |
| 509 | drm_gem_object_reference(obj); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 510 | return obj; |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | attach = dma_buf_attach(dma_buf, dev->dev); |
| 515 | if (IS_ERR(attach)) |
Thomas Meyer | f2a5da4 | 2013-06-01 10:09:27 +0000 | [diff] [blame] | 516 | return ERR_CAST(attach); |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 517 | |
Imre Deak | 011c228 | 2013-04-19 11:11:56 +1000 | [diff] [blame] | 518 | get_dma_buf(dma_buf); |
| 519 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 520 | sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
Colin Cross | fee0c54 | 2013-12-20 16:43:50 -0800 | [diff] [blame] | 521 | if (IS_ERR(sgt)) { |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 522 | ret = PTR_ERR(sgt); |
| 523 | goto fail_detach; |
| 524 | } |
| 525 | |
| 526 | obj = dev->driver->gem_prime_import_sg_table(dev, dma_buf->size, sgt); |
| 527 | if (IS_ERR(obj)) { |
| 528 | ret = PTR_ERR(obj); |
| 529 | goto fail_unmap; |
| 530 | } |
| 531 | |
| 532 | obj->import_attach = attach; |
| 533 | |
| 534 | return obj; |
| 535 | |
| 536 | fail_unmap: |
| 537 | dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); |
| 538 | fail_detach: |
| 539 | dma_buf_detach(dma_buf, attach); |
Imre Deak | 011c228 | 2013-04-19 11:11:56 +1000 | [diff] [blame] | 540 | dma_buf_put(dma_buf); |
| 541 | |
Aaron Plattner | 8917764 | 2013-01-15 20:47:42 +0000 | [diff] [blame] | 542 | return ERR_PTR(ret); |
| 543 | } |
| 544 | EXPORT_SYMBOL(drm_gem_prime_import); |
| 545 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 546 | /** |
| 547 | * drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers |
| 548 | * @dev: dev to export the buffer from |
| 549 | * @file_priv: drm file-private structure |
| 550 | * @prime_fd: fd id of the dma-buf which should be imported |
| 551 | * @handle: pointer to storage for the handle of the imported buffer object |
| 552 | * |
| 553 | * This is the PRIME import function which must be used mandatorily by GEM |
| 554 | * drivers to ensure correct lifetime management of the underlying GEM object. |
| 555 | * The actual importing of GEM object from the dma-buf is done through the |
| 556 | * gem_import_export driver callback. |
| 557 | */ |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 558 | int drm_gem_prime_fd_to_handle(struct drm_device *dev, |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 559 | struct drm_file *file_priv, int prime_fd, |
| 560 | uint32_t *handle) |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 561 | { |
| 562 | struct dma_buf *dma_buf; |
| 563 | struct drm_gem_object *obj; |
| 564 | int ret; |
| 565 | |
| 566 | dma_buf = dma_buf_get(prime_fd); |
| 567 | if (IS_ERR(dma_buf)) |
| 568 | return PTR_ERR(dma_buf); |
| 569 | |
| 570 | mutex_lock(&file_priv->prime.lock); |
| 571 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 572 | ret = drm_prime_lookup_buf_handle(&file_priv->prime, |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 573 | dma_buf, handle); |
Daniel Vetter | 84341c2 | 2013-08-15 00:02:43 +0200 | [diff] [blame] | 574 | if (ret == 0) |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 575 | goto out_put; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 576 | |
| 577 | /* never seen this one, need to import */ |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 578 | mutex_lock(&dev->object_name_lock); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 579 | obj = dev->driver->gem_prime_import(dev, dma_buf); |
| 580 | if (IS_ERR(obj)) { |
| 581 | ret = PTR_ERR(obj); |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 582 | goto out_unlock; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 583 | } |
| 584 | |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 585 | if (obj->dma_buf) { |
| 586 | WARN_ON(obj->dma_buf != dma_buf); |
| 587 | } else { |
| 588 | obj->dma_buf = dma_buf; |
| 589 | get_dma_buf(dma_buf); |
| 590 | } |
| 591 | |
| 592 | /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */ |
| 593 | ret = drm_gem_handle_create_tail(file_priv, obj, handle); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 594 | drm_gem_object_unreference_unlocked(obj); |
| 595 | if (ret) |
| 596 | goto out_put; |
| 597 | |
Dave Airlie | 219b473 | 2013-04-22 09:54:36 +1000 | [diff] [blame] | 598 | ret = drm_prime_add_buf_handle(&file_priv->prime, |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 599 | dma_buf, *handle); |
| 600 | if (ret) |
| 601 | goto fail; |
| 602 | |
| 603 | mutex_unlock(&file_priv->prime.lock); |
Imre Deak | 011c228 | 2013-04-19 11:11:56 +1000 | [diff] [blame] | 604 | |
| 605 | dma_buf_put(dma_buf); |
| 606 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 607 | return 0; |
| 608 | |
| 609 | fail: |
| 610 | /* hmm, if driver attached, we are relying on the free-object path |
| 611 | * to detach.. which seems ok.. |
| 612 | */ |
Daniel Vetter | 730c4ff | 2013-08-15 00:02:38 +0200 | [diff] [blame] | 613 | drm_gem_handle_delete(file_priv, *handle); |
Daniel Vetter | 319c933 | 2013-08-15 00:02:46 +0200 | [diff] [blame] | 614 | out_unlock: |
Dan Carpenter | 0adb237 | 2013-08-23 23:46:02 +0300 | [diff] [blame] | 615 | mutex_unlock(&dev->object_name_lock); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 616 | out_put: |
| 617 | dma_buf_put(dma_buf); |
| 618 | mutex_unlock(&file_priv->prime.lock); |
| 619 | return ret; |
| 620 | } |
| 621 | EXPORT_SYMBOL(drm_gem_prime_fd_to_handle); |
| 622 | |
| 623 | int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, |
| 624 | struct drm_file *file_priv) |
| 625 | { |
| 626 | struct drm_prime_handle *args = data; |
| 627 | uint32_t flags; |
| 628 | |
| 629 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) |
| 630 | return -EINVAL; |
| 631 | |
| 632 | if (!dev->driver->prime_handle_to_fd) |
| 633 | return -ENOSYS; |
| 634 | |
| 635 | /* check flags are valid */ |
| 636 | if (args->flags & ~DRM_CLOEXEC) |
| 637 | return -EINVAL; |
| 638 | |
| 639 | /* we only want to pass DRM_CLOEXEC which is == O_CLOEXEC */ |
| 640 | flags = args->flags & DRM_CLOEXEC; |
| 641 | |
| 642 | return dev->driver->prime_handle_to_fd(dev, file_priv, |
| 643 | args->handle, flags, &args->fd); |
| 644 | } |
| 645 | |
| 646 | int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, |
| 647 | struct drm_file *file_priv) |
| 648 | { |
| 649 | struct drm_prime_handle *args = data; |
| 650 | |
| 651 | if (!drm_core_check_feature(dev, DRIVER_PRIME)) |
| 652 | return -EINVAL; |
| 653 | |
| 654 | if (!dev->driver->prime_fd_to_handle) |
| 655 | return -ENOSYS; |
| 656 | |
| 657 | return dev->driver->prime_fd_to_handle(dev, file_priv, |
| 658 | args->fd, &args->handle); |
| 659 | } |
| 660 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 661 | /** |
| 662 | * drm_prime_pages_to_sg - converts a page array into an sg list |
| 663 | * @pages: pointer to the array of page pointers to convert |
| 664 | * @nr_pages: length of the page vector |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 665 | * |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 666 | * This helper creates an sg table object from a set of pages |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 667 | * the driver is responsible for mapping the pages into the |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 668 | * importers address space for use with dma_buf itself. |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 669 | */ |
| 670 | struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages) |
| 671 | { |
| 672 | struct sg_table *sg = NULL; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 673 | int ret; |
| 674 | |
| 675 | sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL); |
YoungJun Cho | 7e3d88f | 2013-06-24 16:40:53 +0900 | [diff] [blame] | 676 | if (!sg) { |
| 677 | ret = -ENOMEM; |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 678 | goto out; |
YoungJun Cho | 7e3d88f | 2013-06-24 16:40:53 +0900 | [diff] [blame] | 679 | } |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 680 | |
Rahul Sharma | dca25cb | 2013-01-28 08:38:48 -0500 | [diff] [blame] | 681 | ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0, |
| 682 | nr_pages << PAGE_SHIFT, GFP_KERNEL); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 683 | if (ret) |
| 684 | goto out; |
| 685 | |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 686 | return sg; |
| 687 | out: |
| 688 | kfree(sg); |
YoungJun Cho | 7e3d88f | 2013-06-24 16:40:53 +0900 | [diff] [blame] | 689 | return ERR_PTR(ret); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 690 | } |
| 691 | EXPORT_SYMBOL(drm_prime_pages_to_sg); |
| 692 | |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 693 | /** |
| 694 | * drm_prime_sg_to_page_addr_arrays - convert an sg table into a page array |
| 695 | * @sgt: scatter-gather table to convert |
| 696 | * @pages: array of page pointers to store the page array in |
| 697 | * @addrs: optional array to store the dma bus address of each page |
| 698 | * @max_pages: size of both the passed-in arrays |
| 699 | * |
| 700 | * Exports an sg table into an array of pages and addresses. This is currently |
| 701 | * required by the TTM driver in order to do correct fault handling. |
| 702 | */ |
Dave Airlie | 51ab7ba | 2012-05-18 15:40:33 +0100 | [diff] [blame] | 703 | int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages, |
| 704 | dma_addr_t *addrs, int max_pages) |
| 705 | { |
| 706 | unsigned count; |
| 707 | struct scatterlist *sg; |
| 708 | struct page *page; |
Lespiau, Damien | 36dccc8 | 2013-09-28 16:24:02 +0100 | [diff] [blame] | 709 | u32 len; |
Dave Airlie | 51ab7ba | 2012-05-18 15:40:33 +0100 | [diff] [blame] | 710 | int pg_index; |
| 711 | dma_addr_t addr; |
| 712 | |
| 713 | pg_index = 0; |
| 714 | for_each_sg(sgt->sgl, sg, sgt->nents, count) { |
| 715 | len = sg->length; |
Dave Airlie | 51ab7ba | 2012-05-18 15:40:33 +0100 | [diff] [blame] | 716 | page = sg_page(sg); |
| 717 | addr = sg_dma_address(sg); |
| 718 | |
| 719 | while (len > 0) { |
| 720 | if (WARN_ON(pg_index >= max_pages)) |
| 721 | return -1; |
| 722 | pages[pg_index] = page; |
| 723 | if (addrs) |
| 724 | addrs[pg_index] = addr; |
| 725 | |
| 726 | page++; |
| 727 | addr += PAGE_SIZE; |
| 728 | len -= PAGE_SIZE; |
| 729 | pg_index++; |
| 730 | } |
| 731 | } |
| 732 | return 0; |
| 733 | } |
| 734 | EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays); |
Daniel Vetter | 39cc344 | 2014-01-22 19:16:30 +0100 | [diff] [blame] | 735 | |
| 736 | /** |
| 737 | * drm_prime_gem_destroy - helper to clean up a PRIME-imported GEM object |
| 738 | * @obj: GEM object which was created from a dma-buf |
| 739 | * @sg: the sg-table which was pinned at import time |
| 740 | * |
| 741 | * This is the cleanup functions which GEM drivers need to call when they use |
| 742 | * @drm_gem_prime_import to import dma-bufs. |
| 743 | */ |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 744 | void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg) |
| 745 | { |
| 746 | struct dma_buf_attachment *attach; |
| 747 | struct dma_buf *dma_buf; |
| 748 | attach = obj->import_attach; |
| 749 | if (sg) |
| 750 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
| 751 | dma_buf = attach->dmabuf; |
| 752 | dma_buf_detach(attach->dmabuf, attach); |
| 753 | /* remove the reference */ |
| 754 | dma_buf_put(dma_buf); |
| 755 | } |
| 756 | EXPORT_SYMBOL(drm_prime_gem_destroy); |
| 757 | |
| 758 | void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) |
| 759 | { |
| 760 | INIT_LIST_HEAD(&prime_fpriv->head); |
| 761 | mutex_init(&prime_fpriv->lock); |
| 762 | } |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 763 | |
| 764 | void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv) |
| 765 | { |
Imre Deak | 98b7623 | 2013-04-24 19:04:57 +0300 | [diff] [blame] | 766 | /* by now drm_gem_release should've made sure the list is empty */ |
| 767 | WARN_ON(!list_empty(&prime_fpriv->head)); |
Dave Airlie | 3248877 | 2011-11-25 15:21:02 +0000 | [diff] [blame] | 768 | } |