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_fb_helper.h> 13#include <drm/drm_gem.h> 14#include <drm/drm_gem_dma_helper.h> 15#include <drm/drm_prime.h> 16#include <drm/drm_vma_manager.h> 17 18#include "rockchip_drm_drv.h" 19#include "rockchip_drm_gem.h" 20 21static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj) 22{ 23 struct drm_device *drm = rk_obj->base.dev; 24 struct rockchip_drm_private *private = drm->dev_private; 25 int prot = IOMMU_READ | IOMMU_WRITE; 26 ssize_t ret; 27 28 mutex_lock(&private->mm_lock); 29 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm, 30 rk_obj->base.size, PAGE_SIZE, 31 0, 0); 32 mutex_unlock(&private->mm_lock); 33 34 if (ret < 0) { 35 DRM_ERROR("out of I/O virtual memory: %zd\n", ret); 36 return ret; 37 } 38 39 rk_obj->dma_addr = rk_obj->mm.start; 40 41 ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt, 42 prot); 43 if (ret < (ssize_t)rk_obj->base.size) { 44 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n", 45 ret, rk_obj->base.size); 46 ret = -ENOMEM; 47 goto err_remove_node; 48 } 49 50 rk_obj->size = ret; 51 52 return 0; 53 54err_remove_node: 55 mutex_lock(&private->mm_lock); 56 drm_mm_remove_node(&rk_obj->mm); 57 mutex_unlock(&private->mm_lock); 58 59 return ret; 60} 61 62static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj) 63{ 64 struct drm_device *drm = rk_obj->base.dev; 65 struct rockchip_drm_private *private = drm->dev_private; 66 67 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size); 68 69 mutex_lock(&private->mm_lock); 70 71 drm_mm_remove_node(&rk_obj->mm); 72 73 mutex_unlock(&private->mm_lock); 74 75 return 0; 76} 77 78static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj) 79{ 80 struct drm_device *drm = rk_obj->base.dev; 81 int ret, i; 82 struct scatterlist *s; 83 84 rk_obj->pages = drm_gem_get_pages(&rk_obj->base); 85 if (IS_ERR(rk_obj->pages)) 86 return PTR_ERR(rk_obj->pages); 87 88 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT; 89 90 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev, 91 rk_obj->pages, rk_obj->num_pages); 92 if (IS_ERR(rk_obj->sgt)) { 93 ret = PTR_ERR(rk_obj->sgt); 94 goto err_put_pages; 95 } 96 97 /* 98 * Fake up the SG table so that dma_sync_sg_for_device() can be used 99 * to flush the pages associated with it. 100 * 101 * TODO: Replace this by drm_clflush_sg() once it can be implemented 102 * without relying on symbols that are not exported. 103 */ 104 for_each_sgtable_sg(rk_obj->sgt, s, i) 105 sg_dma_address(s) = sg_phys(s); 106 107 dma_sync_sgtable_for_device(drm->dev, rk_obj->sgt, DMA_TO_DEVICE); 108 109 return 0; 110 111err_put_pages: 112 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false); 113 return ret; 114} 115 116static 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 123static 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 148err_unmap: 149 rockchip_gem_iommu_unmap(rk_obj); 150err_free: 151 rockchip_gem_put_pages(rk_obj); 152 153 return ret; 154} 155 156static 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 178static 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 191static 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 198static 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 207static 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 215static 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 228static 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 238static 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 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the 246 * whole buffer from the start. 247 */ 248 vma->vm_pgoff = 0; 249 250 /* 251 * We allocated a struct page table for rk_obj, so clear 252 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). 253 */ 254 vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP); 255 256 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 257 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 258 259 if (rk_obj->pages) 260 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma); 261 else 262 ret = rockchip_drm_gem_object_mmap_dma(obj, vma); 263 264 return ret; 265} 266 267static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj) 268{ 269 drm_gem_object_release(&rk_obj->base); 270 kfree(rk_obj); 271} 272 273static const struct drm_gem_object_funcs rockchip_gem_object_funcs = { 274 .free = rockchip_gem_free_object, 275 .get_sg_table = rockchip_gem_prime_get_sg_table, 276 .vmap = rockchip_gem_prime_vmap, 277 .vunmap = rockchip_gem_prime_vunmap, 278 .mmap = rockchip_drm_gem_object_mmap, 279 .vm_ops = &drm_gem_dma_vm_ops, 280}; 281 282static struct rockchip_gem_object * 283 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size) 284{ 285 struct rockchip_gem_object *rk_obj; 286 struct drm_gem_object *obj; 287 288 size = round_up(size, PAGE_SIZE); 289 290 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL); 291 if (!rk_obj) 292 return ERR_PTR(-ENOMEM); 293 294 obj = &rk_obj->base; 295 296 obj->funcs = &rockchip_gem_object_funcs; 297 298 drm_gem_object_init(drm, obj, size); 299 300 return rk_obj; 301} 302 303struct rockchip_gem_object * 304rockchip_gem_create_object(struct drm_device *drm, unsigned int size, 305 bool alloc_kmap) 306{ 307 struct rockchip_gem_object *rk_obj; 308 int ret; 309 310 rk_obj = rockchip_gem_alloc_object(drm, size); 311 if (IS_ERR(rk_obj)) 312 return rk_obj; 313 314 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap); 315 if (ret) 316 goto err_free_rk_obj; 317 318 return rk_obj; 319 320err_free_rk_obj: 321 rockchip_gem_release_object(rk_obj); 322 return ERR_PTR(ret); 323} 324 325/* 326 * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free 327 * callback function 328 */ 329void rockchip_gem_free_object(struct drm_gem_object *obj) 330{ 331 struct drm_device *drm = obj->dev; 332 struct rockchip_drm_private *private = drm->dev_private; 333 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 334 335 if (obj->import_attach) { 336 if (private->domain) { 337 rockchip_gem_iommu_unmap(rk_obj); 338 } else { 339 dma_unmap_sgtable(drm->dev, rk_obj->sgt, 340 DMA_BIDIRECTIONAL, 0); 341 } 342 drm_prime_gem_destroy(obj, rk_obj->sgt); 343 } else { 344 rockchip_gem_free_buf(rk_obj); 345 } 346 347 rockchip_gem_release_object(rk_obj); 348} 349 350/* 351 * rockchip_gem_create_with_handle - allocate an object with the given 352 * size and create a gem handle on it 353 * 354 * returns a struct rockchip_gem_object* on success or ERR_PTR values 355 * on failure. 356 */ 357static struct rockchip_gem_object * 358rockchip_gem_create_with_handle(struct drm_file *file_priv, 359 struct drm_device *drm, unsigned int size, 360 unsigned int *handle) 361{ 362 struct rockchip_gem_object *rk_obj; 363 struct drm_gem_object *obj; 364 bool is_framebuffer; 365 int ret; 366 367 is_framebuffer = drm->fb_helper && file_priv == drm->fb_helper->client.file; 368 369 rk_obj = rockchip_gem_create_object(drm, size, is_framebuffer); 370 if (IS_ERR(rk_obj)) 371 return ERR_CAST(rk_obj); 372 373 obj = &rk_obj->base; 374 375 /* 376 * allocate a id of idr table where the obj is registered 377 * and handle has the id what user can see. 378 */ 379 ret = drm_gem_handle_create(file_priv, obj, handle); 380 if (ret) 381 goto err_handle_create; 382 383 /* drop reference from allocate - handle holds it now. */ 384 drm_gem_object_put(obj); 385 386 return rk_obj; 387 388err_handle_create: 389 rockchip_gem_free_object(obj); 390 391 return ERR_PTR(ret); 392} 393 394/* 395 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback 396 * function 397 * 398 * This aligns the pitch and size arguments to the minimum required. wrap 399 * this into your own function if you need bigger alignment. 400 */ 401int rockchip_gem_dumb_create(struct drm_file *file_priv, 402 struct drm_device *dev, 403 struct drm_mode_create_dumb *args) 404{ 405 struct rockchip_gem_object *rk_obj; 406 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 407 408 /* 409 * align to 64 bytes since Mali requires it. 410 */ 411 args->pitch = ALIGN(min_pitch, 64); 412 args->size = args->pitch * args->height; 413 414 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size, 415 &args->handle); 416 417 return PTR_ERR_OR_ZERO(rk_obj); 418} 419 420/* 421 * Allocate a sg_table for this GEM object. 422 * Note: Both the table's contents, and the sg_table itself must be freed by 423 * the caller. 424 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. 425 */ 426struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj) 427{ 428 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 429 struct drm_device *drm = obj->dev; 430 struct sg_table *sgt; 431 int ret; 432 433 if (rk_obj->pages) 434 return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages); 435 436 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 437 if (!sgt) 438 return ERR_PTR(-ENOMEM); 439 440 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr, 441 rk_obj->dma_addr, obj->size, 442 rk_obj->dma_attrs); 443 if (ret) { 444 DRM_ERROR("failed to allocate sgt, %d\n", ret); 445 kfree(sgt); 446 return ERR_PTR(ret); 447 } 448 449 return sgt; 450} 451 452static int 453rockchip_gem_iommu_map_sg(struct drm_device *drm, 454 struct dma_buf_attachment *attach, 455 struct sg_table *sg, 456 struct rockchip_gem_object *rk_obj) 457{ 458 rk_obj->sgt = sg; 459 return rockchip_gem_iommu_map(rk_obj); 460} 461 462static int 463rockchip_gem_dma_map_sg(struct drm_device *drm, 464 struct dma_buf_attachment *attach, 465 struct sg_table *sg, 466 struct rockchip_gem_object *rk_obj) 467{ 468 int err = dma_map_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0); 469 if (err) 470 return err; 471 472 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) { 473 DRM_ERROR("failed to map sg_table to contiguous linear address.\n"); 474 dma_unmap_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0); 475 return -EINVAL; 476 } 477 478 rk_obj->dma_addr = sg_dma_address(sg->sgl); 479 rk_obj->sgt = sg; 480 return 0; 481} 482 483struct drm_gem_object * 484rockchip_gem_prime_import_sg_table(struct drm_device *drm, 485 struct dma_buf_attachment *attach, 486 struct sg_table *sg) 487{ 488 struct rockchip_drm_private *private = drm->dev_private; 489 struct rockchip_gem_object *rk_obj; 490 int ret; 491 492 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size); 493 if (IS_ERR(rk_obj)) 494 return ERR_CAST(rk_obj); 495 496 if (private->domain) 497 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj); 498 else 499 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj); 500 501 if (ret < 0) { 502 DRM_ERROR("failed to import sg table: %d\n", ret); 503 goto err_free_rk_obj; 504 } 505 506 return &rk_obj->base; 507 508err_free_rk_obj: 509 rockchip_gem_release_object(rk_obj); 510 return ERR_PTR(ret); 511} 512 513int rockchip_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map) 514{ 515 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 516 517 if (rk_obj->pages) { 518 void *vaddr; 519 520 if (rk_obj->kvaddr) 521 vaddr = rk_obj->kvaddr; 522 else 523 vaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP, 524 pgprot_writecombine(PAGE_KERNEL)); 525 526 if (!vaddr) 527 return -ENOMEM; 528 iosys_map_set_vaddr(map, vaddr); 529 return 0; 530 } 531 532 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING) 533 return -ENOMEM; 534 iosys_map_set_vaddr(map, rk_obj->kvaddr); 535 536 return 0; 537} 538 539void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, 540 struct iosys_map *map) 541{ 542 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 543 544 if (rk_obj->pages) { 545 if (map->vaddr != rk_obj->kvaddr) 546 vunmap(map->vaddr); 547 return; 548 } 549 550 /* Nothing to do if allocated by DMA mapping API. */ 551} 552