1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd 4 * Author:Mark Yao <mark.yao@rock-chips.com> 5 */ 6 7 #include <linux/dma-buf.h> 8 #include <linux/iommu.h> 9 #include <linux/vmalloc.h> 10 11 #include <drm/drm.h> 12 #include <drm/drm_gem.h> 13 #include <drm/drm_gem_cma_helper.h> 14 #include <drm/drm_prime.h> 15 #include <drm/drm_vma_manager.h> 16 17 #include "rockchip_drm_drv.h" 18 #include "rockchip_drm_gem.h" 19 20 static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj) 21 { 22 struct drm_device *drm = rk_obj->base.dev; 23 struct rockchip_drm_private *private = drm->dev_private; 24 int prot = IOMMU_READ | IOMMU_WRITE; 25 ssize_t ret; 26 27 mutex_lock(&private->mm_lock); 28 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm, 29 rk_obj->base.size, PAGE_SIZE, 30 0, 0); 31 mutex_unlock(&private->mm_lock); 32 33 if (ret < 0) { 34 DRM_ERROR("out of I/O virtual memory: %zd\n", ret); 35 return ret; 36 } 37 38 rk_obj->dma_addr = rk_obj->mm.start; 39 40 ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl, 41 rk_obj->sgt->nents, prot); 42 if (ret < rk_obj->base.size) { 43 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n", 44 ret, rk_obj->base.size); 45 ret = -ENOMEM; 46 goto err_remove_node; 47 } 48 49 rk_obj->size = ret; 50 51 return 0; 52 53 err_remove_node: 54 mutex_lock(&private->mm_lock); 55 drm_mm_remove_node(&rk_obj->mm); 56 mutex_unlock(&private->mm_lock); 57 58 return ret; 59 } 60 61 static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj) 62 { 63 struct drm_device *drm = rk_obj->base.dev; 64 struct rockchip_drm_private *private = drm->dev_private; 65 66 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size); 67 68 mutex_lock(&private->mm_lock); 69 70 drm_mm_remove_node(&rk_obj->mm); 71 72 mutex_unlock(&private->mm_lock); 73 74 return 0; 75 } 76 77 static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj) 78 { 79 struct drm_device *drm = rk_obj->base.dev; 80 int ret, i; 81 struct scatterlist *s; 82 83 rk_obj->pages = drm_gem_get_pages(&rk_obj->base); 84 if (IS_ERR(rk_obj->pages)) 85 return PTR_ERR(rk_obj->pages); 86 87 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT; 88 89 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev, 90 rk_obj->pages, rk_obj->num_pages); 91 if (IS_ERR(rk_obj->sgt)) { 92 ret = PTR_ERR(rk_obj->sgt); 93 goto err_put_pages; 94 } 95 96 /* 97 * Fake up the SG table so that dma_sync_sg_for_device() can be used 98 * to flush the pages associated with it. 99 * 100 * TODO: Replace this by drm_clflush_sg() once it can be implemented 101 * without relying on symbols that are not exported. 102 */ 103 for_each_sg(rk_obj->sgt->sgl, s, rk_obj->sgt->nents, i) 104 sg_dma_address(s) = sg_phys(s); 105 106 dma_sync_sg_for_device(drm->dev, rk_obj->sgt->sgl, rk_obj->sgt->nents, 107 DMA_TO_DEVICE); 108 109 return 0; 110 111 err_put_pages: 112 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false); 113 return ret; 114 } 115 116 static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj) 117 { 118 sg_free_table(rk_obj->sgt); 119 kfree(rk_obj->sgt); 120 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true); 121 } 122 123 static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj, 124 bool alloc_kmap) 125 { 126 int ret; 127 128 ret = rockchip_gem_get_pages(rk_obj); 129 if (ret < 0) 130 return ret; 131 132 ret = rockchip_gem_iommu_map(rk_obj); 133 if (ret < 0) 134 goto err_free; 135 136 if (alloc_kmap) { 137 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP, 138 pgprot_writecombine(PAGE_KERNEL)); 139 if (!rk_obj->kvaddr) { 140 DRM_ERROR("failed to vmap() buffer\n"); 141 ret = -ENOMEM; 142 goto err_unmap; 143 } 144 } 145 146 return 0; 147 148 err_unmap: 149 rockchip_gem_iommu_unmap(rk_obj); 150 err_free: 151 rockchip_gem_put_pages(rk_obj); 152 153 return ret; 154 } 155 156 static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj, 157 bool alloc_kmap) 158 { 159 struct drm_gem_object *obj = &rk_obj->base; 160 struct drm_device *drm = obj->dev; 161 162 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE; 163 164 if (!alloc_kmap) 165 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING; 166 167 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size, 168 &rk_obj->dma_addr, GFP_KERNEL, 169 rk_obj->dma_attrs); 170 if (!rk_obj->kvaddr) { 171 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size); 172 return -ENOMEM; 173 } 174 175 return 0; 176 } 177 178 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj, 179 bool alloc_kmap) 180 { 181 struct drm_gem_object *obj = &rk_obj->base; 182 struct drm_device *drm = obj->dev; 183 struct rockchip_drm_private *private = drm->dev_private; 184 185 if (private->domain) 186 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap); 187 else 188 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap); 189 } 190 191 static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj) 192 { 193 vunmap(rk_obj->kvaddr); 194 rockchip_gem_iommu_unmap(rk_obj); 195 rockchip_gem_put_pages(rk_obj); 196 } 197 198 static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj) 199 { 200 struct drm_gem_object *obj = &rk_obj->base; 201 struct drm_device *drm = obj->dev; 202 203 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr, 204 rk_obj->dma_attrs); 205 } 206 207 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj) 208 { 209 if (rk_obj->pages) 210 rockchip_gem_free_iommu(rk_obj); 211 else 212 rockchip_gem_free_dma(rk_obj); 213 } 214 215 static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj, 216 struct vm_area_struct *vma) 217 { 218 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 219 unsigned int count = obj->size >> PAGE_SHIFT; 220 unsigned long user_count = vma_pages(vma); 221 222 if (user_count == 0) 223 return -ENXIO; 224 225 return vm_map_pages(vma, rk_obj->pages, count); 226 } 227 228 static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj, 229 struct vm_area_struct *vma) 230 { 231 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 232 struct drm_device *drm = obj->dev; 233 234 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr, 235 obj->size, rk_obj->dma_attrs); 236 } 237 238 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj, 239 struct vm_area_struct *vma) 240 { 241 int ret; 242 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 243 244 /* 245 * We allocated a struct page table for rk_obj, so clear 246 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). 247 */ 248 vma->vm_flags &= ~VM_PFNMAP; 249 250 if (rk_obj->pages) 251 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma); 252 else 253 ret = rockchip_drm_gem_object_mmap_dma(obj, vma); 254 255 if (ret) 256 drm_gem_vm_close(vma); 257 258 return ret; 259 } 260 261 int rockchip_gem_mmap_buf(struct drm_gem_object *obj, 262 struct vm_area_struct *vma) 263 { 264 int ret; 265 266 ret = drm_gem_mmap_obj(obj, obj->size, vma); 267 if (ret) 268 return ret; 269 270 return rockchip_drm_gem_object_mmap(obj, vma); 271 } 272 273 /* drm driver mmap file operations */ 274 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma) 275 { 276 struct drm_gem_object *obj; 277 int ret; 278 279 ret = drm_gem_mmap(filp, vma); 280 if (ret) 281 return ret; 282 283 /* 284 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the 285 * whole buffer from the start. 286 */ 287 vma->vm_pgoff = 0; 288 289 obj = vma->vm_private_data; 290 291 return rockchip_drm_gem_object_mmap(obj, vma); 292 } 293 294 static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj) 295 { 296 drm_gem_object_release(&rk_obj->base); 297 kfree(rk_obj); 298 } 299 300 static const struct drm_gem_object_funcs rockchip_gem_object_funcs = { 301 .free = rockchip_gem_free_object, 302 .get_sg_table = rockchip_gem_prime_get_sg_table, 303 .vmap = rockchip_gem_prime_vmap, 304 .vunmap = rockchip_gem_prime_vunmap, 305 .vm_ops = &drm_gem_cma_vm_ops, 306 }; 307 308 static struct rockchip_gem_object * 309 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size) 310 { 311 struct rockchip_gem_object *rk_obj; 312 struct drm_gem_object *obj; 313 314 size = round_up(size, PAGE_SIZE); 315 316 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL); 317 if (!rk_obj) 318 return ERR_PTR(-ENOMEM); 319 320 obj = &rk_obj->base; 321 322 obj->funcs = &rockchip_gem_object_funcs; 323 324 drm_gem_object_init(drm, obj, size); 325 326 return rk_obj; 327 } 328 329 struct rockchip_gem_object * 330 rockchip_gem_create_object(struct drm_device *drm, unsigned int size, 331 bool alloc_kmap) 332 { 333 struct rockchip_gem_object *rk_obj; 334 int ret; 335 336 rk_obj = rockchip_gem_alloc_object(drm, size); 337 if (IS_ERR(rk_obj)) 338 return rk_obj; 339 340 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap); 341 if (ret) 342 goto err_free_rk_obj; 343 344 return rk_obj; 345 346 err_free_rk_obj: 347 rockchip_gem_release_object(rk_obj); 348 return ERR_PTR(ret); 349 } 350 351 /* 352 * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free 353 * callback function 354 */ 355 void rockchip_gem_free_object(struct drm_gem_object *obj) 356 { 357 struct drm_device *drm = obj->dev; 358 struct rockchip_drm_private *private = drm->dev_private; 359 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 360 361 if (obj->import_attach) { 362 if (private->domain) { 363 rockchip_gem_iommu_unmap(rk_obj); 364 } else { 365 dma_unmap_sg(drm->dev, rk_obj->sgt->sgl, 366 rk_obj->sgt->nents, DMA_BIDIRECTIONAL); 367 } 368 drm_prime_gem_destroy(obj, rk_obj->sgt); 369 } else { 370 rockchip_gem_free_buf(rk_obj); 371 } 372 373 rockchip_gem_release_object(rk_obj); 374 } 375 376 /* 377 * rockchip_gem_create_with_handle - allocate an object with the given 378 * size and create a gem handle on it 379 * 380 * returns a struct rockchip_gem_object* on success or ERR_PTR values 381 * on failure. 382 */ 383 static struct rockchip_gem_object * 384 rockchip_gem_create_with_handle(struct drm_file *file_priv, 385 struct drm_device *drm, unsigned int size, 386 unsigned int *handle) 387 { 388 struct rockchip_gem_object *rk_obj; 389 struct drm_gem_object *obj; 390 int ret; 391 392 rk_obj = rockchip_gem_create_object(drm, size, false); 393 if (IS_ERR(rk_obj)) 394 return ERR_CAST(rk_obj); 395 396 obj = &rk_obj->base; 397 398 /* 399 * allocate a id of idr table where the obj is registered 400 * and handle has the id what user can see. 401 */ 402 ret = drm_gem_handle_create(file_priv, obj, handle); 403 if (ret) 404 goto err_handle_create; 405 406 /* drop reference from allocate - handle holds it now. */ 407 drm_gem_object_put(obj); 408 409 return rk_obj; 410 411 err_handle_create: 412 rockchip_gem_free_object(obj); 413 414 return ERR_PTR(ret); 415 } 416 417 /* 418 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback 419 * function 420 * 421 * This aligns the pitch and size arguments to the minimum required. wrap 422 * this into your own function if you need bigger alignment. 423 */ 424 int rockchip_gem_dumb_create(struct drm_file *file_priv, 425 struct drm_device *dev, 426 struct drm_mode_create_dumb *args) 427 { 428 struct rockchip_gem_object *rk_obj; 429 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 430 431 /* 432 * align to 64 bytes since Mali requires it. 433 */ 434 args->pitch = ALIGN(min_pitch, 64); 435 args->size = args->pitch * args->height; 436 437 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size, 438 &args->handle); 439 440 return PTR_ERR_OR_ZERO(rk_obj); 441 } 442 443 /* 444 * Allocate a sg_table for this GEM object. 445 * Note: Both the table's contents, and the sg_table itself must be freed by 446 * the caller. 447 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. 448 */ 449 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj) 450 { 451 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 452 struct drm_device *drm = obj->dev; 453 struct sg_table *sgt; 454 int ret; 455 456 if (rk_obj->pages) 457 return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages); 458 459 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 460 if (!sgt) 461 return ERR_PTR(-ENOMEM); 462 463 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr, 464 rk_obj->dma_addr, obj->size, 465 rk_obj->dma_attrs); 466 if (ret) { 467 DRM_ERROR("failed to allocate sgt, %d\n", ret); 468 kfree(sgt); 469 return ERR_PTR(ret); 470 } 471 472 return sgt; 473 } 474 475 static unsigned long rockchip_sg_get_contiguous_size(struct sg_table *sgt, 476 int count) 477 { 478 struct scatterlist *s; 479 dma_addr_t expected = sg_dma_address(sgt->sgl); 480 unsigned int i; 481 unsigned long size = 0; 482 483 for_each_sg(sgt->sgl, s, count, i) { 484 if (sg_dma_address(s) != expected) 485 break; 486 expected = sg_dma_address(s) + sg_dma_len(s); 487 size += sg_dma_len(s); 488 } 489 return size; 490 } 491 492 static int 493 rockchip_gem_iommu_map_sg(struct drm_device *drm, 494 struct dma_buf_attachment *attach, 495 struct sg_table *sg, 496 struct rockchip_gem_object *rk_obj) 497 { 498 rk_obj->sgt = sg; 499 return rockchip_gem_iommu_map(rk_obj); 500 } 501 502 static int 503 rockchip_gem_dma_map_sg(struct drm_device *drm, 504 struct dma_buf_attachment *attach, 505 struct sg_table *sg, 506 struct rockchip_gem_object *rk_obj) 507 { 508 int count = dma_map_sg(drm->dev, sg->sgl, sg->nents, 509 DMA_BIDIRECTIONAL); 510 if (!count) 511 return -EINVAL; 512 513 if (rockchip_sg_get_contiguous_size(sg, count) < attach->dmabuf->size) { 514 DRM_ERROR("failed to map sg_table to contiguous linear address.\n"); 515 dma_unmap_sg(drm->dev, sg->sgl, sg->nents, 516 DMA_BIDIRECTIONAL); 517 return -EINVAL; 518 } 519 520 rk_obj->dma_addr = sg_dma_address(sg->sgl); 521 rk_obj->sgt = sg; 522 return 0; 523 } 524 525 struct drm_gem_object * 526 rockchip_gem_prime_import_sg_table(struct drm_device *drm, 527 struct dma_buf_attachment *attach, 528 struct sg_table *sg) 529 { 530 struct rockchip_drm_private *private = drm->dev_private; 531 struct rockchip_gem_object *rk_obj; 532 int ret; 533 534 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size); 535 if (IS_ERR(rk_obj)) 536 return ERR_CAST(rk_obj); 537 538 if (private->domain) 539 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj); 540 else 541 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj); 542 543 if (ret < 0) { 544 DRM_ERROR("failed to import sg table: %d\n", ret); 545 goto err_free_rk_obj; 546 } 547 548 return &rk_obj->base; 549 550 err_free_rk_obj: 551 rockchip_gem_release_object(rk_obj); 552 return ERR_PTR(ret); 553 } 554 555 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj) 556 { 557 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 558 559 if (rk_obj->pages) 560 return vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP, 561 pgprot_writecombine(PAGE_KERNEL)); 562 563 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING) 564 return NULL; 565 566 return rk_obj->kvaddr; 567 } 568 569 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 570 { 571 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 572 573 if (rk_obj->pages) { 574 vunmap(vaddr); 575 return; 576 } 577 578 /* Nothing to do if allocated by DMA mapping API. */ 579 } 580