1 /* 2 * Copyright 2012 Red Hat Inc 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 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: 24 * Dave Airlie <airlied@redhat.com> 25 */ 26 27 #include <linux/dma-buf.h> 28 #include <linux/reservation.h> 29 30 #include <drm/drmP.h> 31 32 #include "i915_drv.h" 33 34 static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf) 35 { 36 return to_intel_bo(buf->priv); 37 } 38 39 static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachment, 40 enum dma_data_direction dir) 41 { 42 struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); 43 struct sg_table *st; 44 struct scatterlist *src, *dst; 45 int ret, i; 46 47 ret = i915_gem_object_pin_pages(obj); 48 if (ret) 49 goto err; 50 51 /* Copy sg so that we make an independent mapping */ 52 st = kmalloc(sizeof(struct sg_table), M_DRM, GFP_KERNEL); 53 if (st == NULL) { 54 ret = -ENOMEM; 55 goto err_unpin_pages; 56 } 57 58 ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL); 59 if (ret) 60 goto err_free; 61 62 src = obj->mm.pages->sgl; 63 dst = st->sgl; 64 for (i = 0; i < obj->mm.pages->nents; i++) { 65 sg_set_page(dst, sg_page(src), src->length, 0); 66 dst = sg_next(dst); 67 src = sg_next(src); 68 } 69 70 if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) { 71 ret = -ENOMEM; 72 goto err_free_sg; 73 } 74 75 return st; 76 77 err_free_sg: 78 sg_free_table(st); 79 err_free: 80 kfree(st); 81 err_unpin_pages: 82 i915_gem_object_unpin_pages(obj); 83 err: 84 return ERR_PTR(ret); 85 } 86 87 static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, 88 struct sg_table *sg, 89 enum dma_data_direction dir) 90 { 91 struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf); 92 93 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); 94 sg_free_table(sg); 95 kfree(sg); 96 97 i915_gem_object_unpin_pages(obj); 98 } 99 100 static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf) 101 { 102 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 103 104 return i915_gem_object_pin_map(obj, I915_MAP_WB); 105 } 106 107 static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) 108 { 109 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 110 111 i915_gem_object_unpin_map(obj); 112 } 113 114 static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) 115 { 116 return NULL; 117 } 118 119 static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) 120 { 121 122 } 123 static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) 124 { 125 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 126 struct page *page; 127 128 if (page_num >= obj->base.size >> PAGE_SHIFT) 129 return NULL; 130 131 if (!i915_gem_object_has_struct_page(obj)) 132 return NULL; 133 134 if (i915_gem_object_pin_pages(obj)) 135 return NULL; 136 137 /* Synchronisation is left to the caller (via .begin_cpu_access()) */ 138 page = i915_gem_object_get_page(obj, page_num); 139 if (IS_ERR(page)) 140 goto err_unpin; 141 142 return kmap(page); 143 144 err_unpin: 145 i915_gem_object_unpin_pages(obj); 146 return NULL; 147 } 148 149 static void i915_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) 150 { 151 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 152 153 kunmap(virt_to_page(addr)); 154 i915_gem_object_unpin_pages(obj); 155 } 156 157 static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) 158 { 159 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 160 #if 0 161 int ret; 162 #endif 163 164 if (obj->base.size < vma->vm_end - vma->vm_start) 165 return -EINVAL; 166 167 if (!obj->base.filp) 168 return -ENODEV; 169 170 #if 0 171 ret = obj->base.filp->f_op->mmap(obj->base.filp, vma); 172 if (ret) 173 return ret; 174 175 fput(vma->vm_file); 176 vma->vm_file = get_file(obj->base.filp); 177 #endif 178 179 return 0; 180 } 181 182 static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) 183 { 184 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 185 struct drm_device *dev = obj->base.dev; 186 bool write = (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE); 187 int err; 188 189 err = i915_gem_object_pin_pages(obj); 190 if (err) 191 return err; 192 193 err = i915_mutex_lock_interruptible(dev); 194 if (err) 195 goto out; 196 197 err = i915_gem_object_set_to_cpu_domain(obj, write); 198 mutex_unlock(&dev->struct_mutex); 199 200 out: 201 i915_gem_object_unpin_pages(obj); 202 return err; 203 } 204 205 static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction) 206 { 207 struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); 208 struct drm_device *dev = obj->base.dev; 209 int err; 210 211 err = i915_gem_object_pin_pages(obj); 212 if (err) 213 return err; 214 215 err = i915_mutex_lock_interruptible(dev); 216 if (err) 217 goto out; 218 219 err = i915_gem_object_set_to_gtt_domain(obj, false); 220 mutex_unlock(&dev->struct_mutex); 221 222 out: 223 i915_gem_object_unpin_pages(obj); 224 return err; 225 } 226 227 static const struct dma_buf_ops i915_dmabuf_ops = { 228 .map_dma_buf = i915_gem_map_dma_buf, 229 .unmap_dma_buf = i915_gem_unmap_dma_buf, 230 .release = drm_gem_dmabuf_release, 231 .map = i915_gem_dmabuf_kmap, 232 .map_atomic = i915_gem_dmabuf_kmap_atomic, 233 .unmap = i915_gem_dmabuf_kunmap, 234 .unmap_atomic = i915_gem_dmabuf_kunmap_atomic, 235 .mmap = i915_gem_dmabuf_mmap, 236 .vmap = i915_gem_dmabuf_vmap, 237 .vunmap = i915_gem_dmabuf_vunmap, 238 .begin_cpu_access = i915_gem_begin_cpu_access, 239 .end_cpu_access = i915_gem_end_cpu_access, 240 }; 241 242 struct dma_buf *i915_gem_prime_export(struct drm_device *dev, 243 struct drm_gem_object *gem_obj, int flags) 244 { 245 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj); 246 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 247 248 exp_info.ops = &i915_dmabuf_ops; 249 exp_info.size = gem_obj->size; 250 exp_info.flags = flags; 251 exp_info.priv = gem_obj; 252 exp_info.resv = obj->resv; 253 254 if (obj->ops->dmabuf_export) { 255 int ret = obj->ops->dmabuf_export(obj); 256 if (ret) 257 return ERR_PTR(ret); 258 } 259 260 return drm_gem_dmabuf_export(dev, &exp_info); 261 } 262 263 static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj) 264 { 265 struct sg_table *pages; 266 unsigned int sg_page_sizes; 267 268 pages = dma_buf_map_attachment(obj->base.import_attach, 269 DMA_BIDIRECTIONAL); 270 if (IS_ERR(pages)) 271 return PTR_ERR(pages); 272 273 sg_page_sizes = i915_sg_page_sizes(pages->sgl); 274 275 __i915_gem_object_set_pages(obj, pages, sg_page_sizes); 276 277 return 0; 278 } 279 280 static void i915_gem_object_put_pages_dmabuf(struct drm_i915_gem_object *obj, 281 struct sg_table *pages) 282 { 283 dma_buf_unmap_attachment(obj->base.import_attach, pages, 284 DMA_BIDIRECTIONAL); 285 } 286 287 static const struct drm_i915_gem_object_ops i915_gem_object_dmabuf_ops = { 288 .get_pages = i915_gem_object_get_pages_dmabuf, 289 .put_pages = i915_gem_object_put_pages_dmabuf, 290 }; 291 292 struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, 293 struct dma_buf *dma_buf) 294 { 295 struct dma_buf_attachment *attach; 296 struct drm_i915_gem_object *obj; 297 int ret; 298 299 /* is this one of own objects? */ 300 if (dma_buf->ops == &i915_dmabuf_ops) { 301 obj = dma_buf_to_obj(dma_buf); 302 /* is it from our device? */ 303 if (obj->base.dev == dev) { 304 /* 305 * Importing dmabuf exported from out own gem increases 306 * refcount on gem itself instead of f_count of dmabuf. 307 */ 308 return &i915_gem_object_get(obj)->base; 309 } 310 } 311 312 /* need to attach */ 313 attach = dma_buf_attach(dma_buf, dev->dev); 314 if (IS_ERR(attach)) 315 return ERR_CAST(attach); 316 317 #if 0 318 get_dma_buf(dma_buf); 319 #endif 320 321 obj = i915_gem_object_alloc(to_i915(dev)); 322 if (obj == NULL) { 323 ret = -ENOMEM; 324 goto fail_detach; 325 } 326 327 drm_gem_private_object_init(dev, &obj->base, dma_buf->size); 328 i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops); 329 obj->base.import_attach = attach; 330 obj->resv = dma_buf->resv; 331 332 /* We use GTT as shorthand for a coherent domain, one that is 333 * neither in the GPU cache nor in the CPU cache, where all 334 * writes are immediately visible in memory. (That's not strictly 335 * true, but it's close! There are internal buffers such as the 336 * write-combined buffer or a delay through the chipset for GTT 337 * writes that do require us to treat GTT as a separate cache domain.) 338 */ 339 obj->base.read_domains = I915_GEM_DOMAIN_GTT; 340 obj->base.write_domain = 0; 341 342 return &obj->base; 343 344 fail_detach: 345 #if 0 346 dma_buf_detach(dma_buf, attach); 347 dma_buf_put(dma_buf); 348 #endif 349 350 return ERR_PTR(ret); 351 } 352 353 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) 354 #include "selftests/mock_dmabuf.c" 355 #include "selftests/i915_gem_dmabuf.c" 356 #endif 357