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