1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/ 4 * Author: Rob Clark <rob.clark@linaro.org> 5 */ 6 7#include <linux/dma-mapping.h> 8#include <linux/seq_file.h> 9#include <linux/shmem_fs.h> 10#include <linux/spinlock.h> 11#include <linux/pfn_t.h> 12 13#include <drm/drm_prime.h> 14#include <drm/drm_vma_manager.h> 15 16#include "omap_drv.h" 17#include "omap_dmm_tiler.h" 18 19/* 20 * GEM buffer object implementation. 21 */ 22 23/* note: we use upper 8 bits of flags for driver-internal flags: */ 24#define OMAP_BO_MEM_DMA_API 0x01000000 /* memory allocated with the dma_alloc_* API */ 25#define OMAP_BO_MEM_SHMEM 0x02000000 /* memory allocated through shmem backing */ 26#define OMAP_BO_MEM_DMABUF 0x08000000 /* memory imported from a dmabuf */ 27 28struct omap_gem_object { 29 struct drm_gem_object base; 30 31 struct list_head mm_list; 32 33 u32 flags; 34 35 /** width/height for tiled formats (rounded up to slot boundaries) */ 36 u16 width, height; 37 38 /** roll applied when mapping to DMM */ 39 u32 roll; 40 41 /** protects pin_cnt, block, pages, dma_addrs and vaddr */ 42 struct mutex lock; 43 44 /** 45 * dma_addr contains the buffer DMA address. It is valid for 46 * 47 * - buffers allocated through the DMA mapping API (with the 48 * OMAP_BO_MEM_DMA_API flag set) 49 * 50 * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set) 51 * if they are physically contiguous 52 * 53 * - buffers mapped through the TILER when pin_cnt is not zero, in which 54 * case the DMA address points to the TILER aperture 55 * 56 * Physically contiguous buffers have their DMA address equal to the 57 * physical address as we don't remap those buffers through the TILER. 58 * 59 * Buffers mapped to the TILER have their DMA address pointing to the 60 * TILER aperture. As TILER mappings are refcounted (through pin_cnt) 61 * the DMA address must be accessed through omap_gem_pin() to ensure 62 * that the mapping won't disappear unexpectedly. References must be 63 * released with omap_gem_unpin(). 64 */ 65 dma_addr_t dma_addr; 66 67 /** 68 * # of users 69 */ 70 refcount_t pin_cnt; 71 72 /** 73 * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag 74 * is set and the sgt field is valid. 75 */ 76 struct sg_table *sgt; 77 78 /** 79 * tiler block used when buffer is remapped in DMM/TILER. 80 */ 81 struct tiler_block *block; 82 83 /** 84 * Array of backing pages, if allocated. Note that pages are never 85 * allocated for buffers originally allocated from contiguous memory 86 */ 87 struct page **pages; 88 89 /** addresses corresponding to pages in above array */ 90 dma_addr_t *dma_addrs; 91 92 /** 93 * Virtual address, if mapped. 94 */ 95 void *vaddr; 96}; 97 98#define to_omap_bo(x) container_of(x, struct omap_gem_object, base) 99 100/* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are 101 * not necessarily pinned in TILER all the time, and (b) when they are 102 * they are not necessarily page aligned, we reserve one or more small 103 * regions in each of the 2d containers to use as a user-GART where we 104 * can create a second page-aligned mapping of parts of the buffer 105 * being accessed from userspace. 106 * 107 * Note that we could optimize slightly when we know that multiple 108 * tiler containers are backed by the same PAT.. but I'll leave that 109 * for later.. 110 */ 111#define NUM_USERGART_ENTRIES 2 112struct omap_drm_usergart_entry { 113 struct tiler_block *block; /* the reserved tiler block */ 114 dma_addr_t dma_addr; 115 struct drm_gem_object *obj; /* the current pinned obj */ 116 pgoff_t obj_pgoff; /* page offset of obj currently 117 mapped in */ 118}; 119 120struct omap_drm_usergart { 121 struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES]; 122 int height; /* height in rows */ 123 int height_shift; /* ilog2(height in rows) */ 124 int slot_shift; /* ilog2(width per slot) */ 125 int stride_pfn; /* stride in pages */ 126 int last; /* index of last used entry */ 127}; 128 129/* ----------------------------------------------------------------------------- 130 * Helpers 131 */ 132 133/** get mmap offset */ 134u64 omap_gem_mmap_offset(struct drm_gem_object *obj) 135{ 136 struct drm_device *dev = obj->dev; 137 int ret; 138 size_t size; 139 140 /* Make it mmapable */ 141 size = omap_gem_mmap_size(obj); 142 ret = drm_gem_create_mmap_offset_size(obj, size); 143 if (ret) { 144 dev_err(dev->dev, "could not allocate mmap offset\n"); 145 return 0; 146 } 147 148 return drm_vma_node_offset_addr(&obj->vma_node); 149} 150 151static bool omap_gem_sgt_is_contiguous(struct sg_table *sgt, size_t size) 152{ 153 return !(drm_prime_get_contiguous_size(sgt) < size); 154} 155 156static bool omap_gem_is_contiguous(struct omap_gem_object *omap_obj) 157{ 158 if (omap_obj->flags & OMAP_BO_MEM_DMA_API) 159 return true; 160 161 if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && 162 omap_gem_sgt_is_contiguous(omap_obj->sgt, omap_obj->base.size)) 163 return true; 164 165 return false; 166} 167 168/* ----------------------------------------------------------------------------- 169 * Eviction 170 */ 171 172static void omap_gem_evict_entry(struct drm_gem_object *obj, 173 enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry) 174{ 175 struct omap_gem_object *omap_obj = to_omap_bo(obj); 176 struct omap_drm_private *priv = obj->dev->dev_private; 177 int n = priv->usergart[fmt].height; 178 size_t size = PAGE_SIZE * n; 179 loff_t off = omap_gem_mmap_offset(obj) + 180 (entry->obj_pgoff << PAGE_SHIFT); 181 const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE); 182 183 if (m > 1) { 184 int i; 185 /* if stride > than PAGE_SIZE then sparse mapping: */ 186 for (i = n; i > 0; i--) { 187 unmap_mapping_range(obj->dev->anon_inode->i_mapping, 188 off, PAGE_SIZE, 1); 189 off += PAGE_SIZE * m; 190 } 191 } else { 192 unmap_mapping_range(obj->dev->anon_inode->i_mapping, 193 off, size, 1); 194 } 195 196 entry->obj = NULL; 197} 198 199/* Evict a buffer from usergart, if it is mapped there */ 200static void omap_gem_evict(struct drm_gem_object *obj) 201{ 202 struct omap_gem_object *omap_obj = to_omap_bo(obj); 203 struct omap_drm_private *priv = obj->dev->dev_private; 204 205 if (omap_obj->flags & OMAP_BO_TILED_MASK) { 206 enum tiler_fmt fmt = gem2fmt(omap_obj->flags); 207 int i; 208 209 for (i = 0; i < NUM_USERGART_ENTRIES; i++) { 210 struct omap_drm_usergart_entry *entry = 211 &priv->usergart[fmt].entry[i]; 212 213 if (entry->obj == obj) 214 omap_gem_evict_entry(obj, fmt, entry); 215 } 216 } 217} 218 219/* ----------------------------------------------------------------------------- 220 * Page Management 221 */ 222 223/* 224 * Ensure backing pages are allocated. Must be called with the omap_obj.lock 225 * held. 226 */ 227static int omap_gem_attach_pages(struct drm_gem_object *obj) 228{ 229 struct drm_device *dev = obj->dev; 230 struct omap_gem_object *omap_obj = to_omap_bo(obj); 231 struct page **pages; 232 int npages = obj->size >> PAGE_SHIFT; 233 int i, ret; 234 dma_addr_t *addrs; 235 236 lockdep_assert_held(&omap_obj->lock); 237 238 /* 239 * If not using shmem (in which case backing pages don't need to be 240 * allocated) or if pages are already allocated we're done. 241 */ 242 if (!(omap_obj->flags & OMAP_BO_MEM_SHMEM) || omap_obj->pages) 243 return 0; 244 245 pages = drm_gem_get_pages(obj); 246 if (IS_ERR(pages)) { 247 dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages)); 248 return PTR_ERR(pages); 249 } 250 251 /* for non-cached buffers, ensure the new pages are clean because 252 * DSS, GPU, etc. are not cache coherent: 253 */ 254 if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) { 255 addrs = kmalloc_array(npages, sizeof(*addrs), GFP_KERNEL); 256 if (!addrs) { 257 ret = -ENOMEM; 258 goto free_pages; 259 } 260 261 for (i = 0; i < npages; i++) { 262 addrs[i] = dma_map_page(dev->dev, pages[i], 263 0, PAGE_SIZE, DMA_TO_DEVICE); 264 265 if (dma_mapping_error(dev->dev, addrs[i])) { 266 dev_warn(dev->dev, 267 "%s: failed to map page\n", __func__); 268 269 for (i = i - 1; i >= 0; --i) { 270 dma_unmap_page(dev->dev, addrs[i], 271 PAGE_SIZE, DMA_TO_DEVICE); 272 } 273 274 ret = -ENOMEM; 275 goto free_addrs; 276 } 277 } 278 } else { 279 addrs = kcalloc(npages, sizeof(*addrs), GFP_KERNEL); 280 if (!addrs) { 281 ret = -ENOMEM; 282 goto free_pages; 283 } 284 } 285 286 omap_obj->dma_addrs = addrs; 287 omap_obj->pages = pages; 288 289 return 0; 290 291free_addrs: 292 kfree(addrs); 293free_pages: 294 drm_gem_put_pages(obj, pages, true, false); 295 296 return ret; 297} 298 299/* Release backing pages. Must be called with the omap_obj.lock held. */ 300static void omap_gem_detach_pages(struct drm_gem_object *obj) 301{ 302 struct omap_gem_object *omap_obj = to_omap_bo(obj); 303 unsigned int npages = obj->size >> PAGE_SHIFT; 304 unsigned int i; 305 306 lockdep_assert_held(&omap_obj->lock); 307 308 for (i = 0; i < npages; i++) { 309 if (omap_obj->dma_addrs[i]) 310 dma_unmap_page(obj->dev->dev, omap_obj->dma_addrs[i], 311 PAGE_SIZE, DMA_TO_DEVICE); 312 } 313 314 kfree(omap_obj->dma_addrs); 315 omap_obj->dma_addrs = NULL; 316 317 drm_gem_put_pages(obj, omap_obj->pages, true, false); 318 omap_obj->pages = NULL; 319} 320 321/* get buffer flags */ 322u32 omap_gem_flags(struct drm_gem_object *obj) 323{ 324 return to_omap_bo(obj)->flags; 325} 326 327/** get mmap size */ 328size_t omap_gem_mmap_size(struct drm_gem_object *obj) 329{ 330 struct omap_gem_object *omap_obj = to_omap_bo(obj); 331 size_t size = obj->size; 332 333 if (omap_obj->flags & OMAP_BO_TILED_MASK) { 334 /* for tiled buffers, the virtual size has stride rounded up 335 * to 4kb.. (to hide the fact that row n+1 might start 16kb or 336 * 32kb later!). But we don't back the entire buffer with 337 * pages, only the valid picture part.. so need to adjust for 338 * this in the size used to mmap and generate mmap offset 339 */ 340 size = tiler_vsize(gem2fmt(omap_obj->flags), 341 omap_obj->width, omap_obj->height); 342 } 343 344 return size; 345} 346 347/* ----------------------------------------------------------------------------- 348 * Fault Handling 349 */ 350 351/* Normal handling for the case of faulting in non-tiled buffers */ 352static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj, 353 struct vm_area_struct *vma, struct vm_fault *vmf) 354{ 355 struct omap_gem_object *omap_obj = to_omap_bo(obj); 356 unsigned long pfn; 357 pgoff_t pgoff; 358 359 /* We don't use vmf->pgoff since that has the fake offset: */ 360 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 361 362 if (omap_obj->pages) { 363 omap_gem_cpu_sync_page(obj, pgoff); 364 pfn = page_to_pfn(omap_obj->pages[pgoff]); 365 } else { 366 BUG_ON(!omap_gem_is_contiguous(omap_obj)); 367 pfn = (omap_obj->dma_addr >> PAGE_SHIFT) + pgoff; 368 } 369 370 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, 371 pfn, pfn << PAGE_SHIFT); 372 373 return vmf_insert_mixed(vma, vmf->address, 374 __pfn_to_pfn_t(pfn, PFN_DEV)); 375} 376 377/* Special handling for the case of faulting in 2d tiled buffers */ 378static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj, 379 struct vm_area_struct *vma, struct vm_fault *vmf) 380{ 381 struct omap_gem_object *omap_obj = to_omap_bo(obj); 382 struct omap_drm_private *priv = obj->dev->dev_private; 383 struct omap_drm_usergart_entry *entry; 384 enum tiler_fmt fmt = gem2fmt(omap_obj->flags); 385 struct page *pages[64]; /* XXX is this too much to have on stack? */ 386 unsigned long pfn; 387 pgoff_t pgoff, base_pgoff; 388 unsigned long vaddr; 389 int i, err, slots; 390 vm_fault_t ret = VM_FAULT_NOPAGE; 391 392 /* 393 * Note the height of the slot is also equal to the number of pages 394 * that need to be mapped in to fill 4kb wide CPU page. If the slot 395 * height is 64, then 64 pages fill a 4kb wide by 64 row region. 396 */ 397 const int n = priv->usergart[fmt].height; 398 const int n_shift = priv->usergart[fmt].height_shift; 399 400 /* 401 * If buffer width in bytes > PAGE_SIZE then the virtual stride is 402 * rounded up to next multiple of PAGE_SIZE.. this need to be taken 403 * into account in some of the math, so figure out virtual stride 404 * in pages 405 */ 406 const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE); 407 408 /* We don't use vmf->pgoff since that has the fake offset: */ 409 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 410 411 /* 412 * Actual address we start mapping at is rounded down to previous slot 413 * boundary in the y direction: 414 */ 415 base_pgoff = round_down(pgoff, m << n_shift); 416 417 /* figure out buffer width in slots */ 418 slots = omap_obj->width >> priv->usergart[fmt].slot_shift; 419 420 vaddr = vmf->address - ((pgoff - base_pgoff) << PAGE_SHIFT); 421 422 entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last]; 423 424 /* evict previous buffer using this usergart entry, if any: */ 425 if (entry->obj) 426 omap_gem_evict_entry(entry->obj, fmt, entry); 427 428 entry->obj = obj; 429 entry->obj_pgoff = base_pgoff; 430 431 /* now convert base_pgoff to phys offset from virt offset: */ 432 base_pgoff = (base_pgoff >> n_shift) * slots; 433 434 /* for wider-than 4k.. figure out which part of the slot-row we want: */ 435 if (m > 1) { 436 int off = pgoff % m; 437 entry->obj_pgoff += off; 438 base_pgoff /= m; 439 slots = min(slots - (off << n_shift), n); 440 base_pgoff += off << n_shift; 441 vaddr += off << PAGE_SHIFT; 442 } 443 444 /* 445 * Map in pages. Beyond the valid pixel part of the buffer, we set 446 * pages[i] to NULL to get a dummy page mapped in.. if someone 447 * reads/writes it they will get random/undefined content, but at 448 * least it won't be corrupting whatever other random page used to 449 * be mapped in, or other undefined behavior. 450 */ 451 memcpy(pages, &omap_obj->pages[base_pgoff], 452 sizeof(struct page *) * slots); 453 memset(pages + slots, 0, 454 sizeof(struct page *) * (n - slots)); 455 456 err = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true); 457 if (err) { 458 ret = vmf_error(err); 459 dev_err(obj->dev->dev, "failed to pin: %d\n", err); 460 return ret; 461 } 462 463 pfn = entry->dma_addr >> PAGE_SHIFT; 464 465 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, 466 pfn, pfn << PAGE_SHIFT); 467 468 for (i = n; i > 0; i--) { 469 ret = vmf_insert_mixed(vma, 470 vaddr, __pfn_to_pfn_t(pfn, PFN_DEV)); 471 if (ret & VM_FAULT_ERROR) 472 break; 473 pfn += priv->usergart[fmt].stride_pfn; 474 vaddr += PAGE_SIZE * m; 475 } 476 477 /* simple round-robin: */ 478 priv->usergart[fmt].last = (priv->usergart[fmt].last + 1) 479 % NUM_USERGART_ENTRIES; 480 481 return ret; 482} 483 484/** 485 * omap_gem_fault - pagefault handler for GEM objects 486 * @vmf: fault detail 487 * 488 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM 489 * does most of the work for us including the actual map/unmap calls 490 * but we need to do the actual page work. 491 * 492 * The VMA was set up by GEM. In doing so it also ensured that the 493 * vma->vm_private_data points to the GEM object that is backing this 494 * mapping. 495 */ 496static vm_fault_t omap_gem_fault(struct vm_fault *vmf) 497{ 498 struct vm_area_struct *vma = vmf->vma; 499 struct drm_gem_object *obj = vma->vm_private_data; 500 struct omap_gem_object *omap_obj = to_omap_bo(obj); 501 int err; 502 vm_fault_t ret; 503 504 /* Make sure we don't parallel update on a fault, nor move or remove 505 * something from beneath our feet 506 */ 507 mutex_lock(&omap_obj->lock); 508 509 /* if a shmem backed object, make sure we have pages attached now */ 510 err = omap_gem_attach_pages(obj); 511 if (err) { 512 ret = vmf_error(err); 513 goto fail; 514 } 515 516 /* where should we do corresponding put_pages().. we are mapping 517 * the original page, rather than thru a GART, so we can't rely 518 * on eviction to trigger this. But munmap() or all mappings should 519 * probably trigger put_pages()? 520 */ 521 522 if (omap_obj->flags & OMAP_BO_TILED_MASK) 523 ret = omap_gem_fault_2d(obj, vma, vmf); 524 else 525 ret = omap_gem_fault_1d(obj, vma, vmf); 526 527 528fail: 529 mutex_unlock(&omap_obj->lock); 530 return ret; 531} 532 533static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) 534{ 535 struct omap_gem_object *omap_obj = to_omap_bo(obj); 536 537 vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP | VM_IO | VM_MIXEDMAP); 538 539 if (omap_obj->flags & OMAP_BO_WC) { 540 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 541 } else if (omap_obj->flags & OMAP_BO_UNCACHED) { 542 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 543 } else { 544 /* 545 * We do have some private objects, at least for scanout buffers 546 * on hardware without DMM/TILER. But these are allocated write- 547 * combine 548 */ 549 if (WARN_ON(!obj->filp)) 550 return -EINVAL; 551 552 /* 553 * Shunt off cached objs to shmem file so they have their own 554 * address_space (so unmap_mapping_range does what we want, 555 * in particular in the case of mmap'd dmabufs) 556 */ 557 vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node); 558 vma_set_file(vma, obj->filp); 559 560 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 561 } 562 563 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 564 565 return 0; 566} 567 568/* ----------------------------------------------------------------------------- 569 * Dumb Buffers 570 */ 571 572/** 573 * omap_gem_dumb_create - create a dumb buffer 574 * @file: our client file 575 * @dev: our device 576 * @args: the requested arguments copied from userspace 577 * 578 * Allocate a buffer suitable for use for a frame buffer of the 579 * form described by user space. Give userspace a handle by which 580 * to reference it. 581 */ 582int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev, 583 struct drm_mode_create_dumb *args) 584{ 585 union omap_gem_size gsize; 586 587 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 588 589 args->size = PAGE_ALIGN(args->pitch * args->height); 590 591 gsize = (union omap_gem_size){ 592 .bytes = args->size, 593 }; 594 595 return omap_gem_new_handle(dev, file, gsize, 596 OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle); 597} 598 599/** 600 * omap_gem_dumb_map_offset - create an offset for a dumb buffer 601 * @file: our drm client file 602 * @dev: drm device 603 * @handle: GEM handle to the object (from dumb_create) 604 * @offset: memory map offset placeholder 605 * 606 * Do the necessary setup to allow the mapping of the frame buffer 607 * into user memory. We don't have to do much here at the moment. 608 */ 609int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, 610 u32 handle, u64 *offset) 611{ 612 struct drm_gem_object *obj; 613 int ret = 0; 614 615 /* GEM does all our handle to object mapping */ 616 obj = drm_gem_object_lookup(file, handle); 617 if (obj == NULL) { 618 ret = -ENOENT; 619 goto fail; 620 } 621 622 *offset = omap_gem_mmap_offset(obj); 623 624 drm_gem_object_put(obj); 625 626fail: 627 return ret; 628} 629 630#ifdef CONFIG_DRM_FBDEV_EMULATION 631/* Set scrolling position. This allows us to implement fast scrolling 632 * for console. 633 * 634 * Call only from non-atomic contexts. 635 */ 636int omap_gem_roll(struct drm_gem_object *obj, u32 roll) 637{ 638 struct omap_gem_object *omap_obj = to_omap_bo(obj); 639 u32 npages = obj->size >> PAGE_SHIFT; 640 int ret = 0; 641 642 if (roll > npages) { 643 dev_err(obj->dev->dev, "invalid roll: %d\n", roll); 644 return -EINVAL; 645 } 646 647 omap_obj->roll = roll; 648 649 mutex_lock(&omap_obj->lock); 650 651 /* if we aren't mapped yet, we don't need to do anything */ 652 if (omap_obj->block) { 653 ret = omap_gem_attach_pages(obj); 654 if (ret) 655 goto fail; 656 657 ret = tiler_pin(omap_obj->block, omap_obj->pages, npages, 658 roll, true); 659 if (ret) 660 dev_err(obj->dev->dev, "could not repin: %d\n", ret); 661 } 662 663fail: 664 mutex_unlock(&omap_obj->lock); 665 666 return ret; 667} 668#endif 669 670/* ----------------------------------------------------------------------------- 671 * Memory Management & DMA Sync 672 */ 673 674/* 675 * shmem buffers that are mapped cached are not coherent. 676 * 677 * We keep track of dirty pages using page faulting to perform cache management. 678 * When a page is mapped to the CPU in read/write mode the device can't access 679 * it and omap_obj->dma_addrs[i] is NULL. When a page is mapped to the device 680 * the omap_obj->dma_addrs[i] is set to the DMA address, and the page is 681 * unmapped from the CPU. 682 */ 683static inline bool omap_gem_is_cached_coherent(struct drm_gem_object *obj) 684{ 685 struct omap_gem_object *omap_obj = to_omap_bo(obj); 686 687 return !((omap_obj->flags & OMAP_BO_MEM_SHMEM) && 688 ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED)); 689} 690 691/* Sync the buffer for CPU access.. note pages should already be 692 * attached, ie. omap_gem_get_pages() 693 */ 694void omap_gem_cpu_sync_page(struct drm_gem_object *obj, int pgoff) 695{ 696 struct drm_device *dev = obj->dev; 697 struct omap_gem_object *omap_obj = to_omap_bo(obj); 698 699 if (omap_gem_is_cached_coherent(obj)) 700 return; 701 702 if (omap_obj->dma_addrs[pgoff]) { 703 dma_unmap_page(dev->dev, omap_obj->dma_addrs[pgoff], 704 PAGE_SIZE, DMA_TO_DEVICE); 705 omap_obj->dma_addrs[pgoff] = 0; 706 } 707} 708 709/* sync the buffer for DMA access */ 710void omap_gem_dma_sync_buffer(struct drm_gem_object *obj, 711 enum dma_data_direction dir) 712{ 713 struct drm_device *dev = obj->dev; 714 struct omap_gem_object *omap_obj = to_omap_bo(obj); 715 int i, npages = obj->size >> PAGE_SHIFT; 716 struct page **pages = omap_obj->pages; 717 bool dirty = false; 718 719 if (omap_gem_is_cached_coherent(obj)) 720 return; 721 722 for (i = 0; i < npages; i++) { 723 if (!omap_obj->dma_addrs[i]) { 724 dma_addr_t addr; 725 726 addr = dma_map_page(dev->dev, pages[i], 0, 727 PAGE_SIZE, dir); 728 if (dma_mapping_error(dev->dev, addr)) { 729 dev_warn(dev->dev, "%s: failed to map page\n", 730 __func__); 731 break; 732 } 733 734 dirty = true; 735 omap_obj->dma_addrs[i] = addr; 736 } 737 } 738 739 if (dirty) { 740 unmap_mapping_range(obj->filp->f_mapping, 0, 741 omap_gem_mmap_size(obj), 1); 742 } 743} 744 745static int omap_gem_pin_tiler(struct drm_gem_object *obj) 746{ 747 struct omap_gem_object *omap_obj = to_omap_bo(obj); 748 u32 npages = obj->size >> PAGE_SHIFT; 749 enum tiler_fmt fmt = gem2fmt(omap_obj->flags); 750 struct tiler_block *block; 751 int ret; 752 753 BUG_ON(omap_obj->block); 754 755 if (omap_obj->flags & OMAP_BO_TILED_MASK) { 756 block = tiler_reserve_2d(fmt, omap_obj->width, omap_obj->height, 757 PAGE_SIZE); 758 } else { 759 block = tiler_reserve_1d(obj->size); 760 } 761 762 if (IS_ERR(block)) { 763 ret = PTR_ERR(block); 764 dev_err(obj->dev->dev, "could not remap: %d (%d)\n", ret, fmt); 765 goto fail; 766 } 767 768 /* TODO: enable async refill.. */ 769 ret = tiler_pin(block, omap_obj->pages, npages, omap_obj->roll, true); 770 if (ret) { 771 tiler_release(block); 772 dev_err(obj->dev->dev, "could not pin: %d\n", ret); 773 goto fail; 774 } 775 776 omap_obj->dma_addr = tiler_ssptr(block); 777 omap_obj->block = block; 778 779 DBG("got dma address: %pad", &omap_obj->dma_addr); 780 781fail: 782 return ret; 783} 784 785/** 786 * omap_gem_pin() - Pin a GEM object in memory 787 * @obj: the GEM object 788 * @dma_addr: the DMA address 789 * 790 * Pin the given GEM object in memory and fill the dma_addr pointer with the 791 * object's DMA address. If the buffer is not physically contiguous it will be 792 * remapped through the TILER to provide a contiguous view. 793 * 794 * Pins are reference-counted, calling this function multiple times is allowed 795 * as long the corresponding omap_gem_unpin() calls are balanced. 796 * 797 * Return 0 on success or a negative error code otherwise. 798 */ 799int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr) 800{ 801 struct omap_drm_private *priv = obj->dev->dev_private; 802 struct omap_gem_object *omap_obj = to_omap_bo(obj); 803 int ret = 0; 804 805 mutex_lock(&omap_obj->lock); 806 807 if (!omap_gem_is_contiguous(omap_obj)) { 808 if (refcount_read(&omap_obj->pin_cnt) == 0) { 809 810 refcount_set(&omap_obj->pin_cnt, 1); 811 812 ret = omap_gem_attach_pages(obj); 813 if (ret) 814 goto fail; 815 816 if (omap_obj->flags & OMAP_BO_SCANOUT) { 817 if (priv->has_dmm) { 818 ret = omap_gem_pin_tiler(obj); 819 if (ret) 820 goto fail; 821 } 822 } 823 } else { 824 refcount_inc(&omap_obj->pin_cnt); 825 } 826 } 827 828 if (dma_addr) 829 *dma_addr = omap_obj->dma_addr; 830 831fail: 832 mutex_unlock(&omap_obj->lock); 833 834 return ret; 835} 836 837/** 838 * omap_gem_unpin_locked() - Unpin a GEM object from memory 839 * @obj: the GEM object 840 * 841 * omap_gem_unpin() without locking. 842 */ 843static void omap_gem_unpin_locked(struct drm_gem_object *obj) 844{ 845 struct omap_drm_private *priv = obj->dev->dev_private; 846 struct omap_gem_object *omap_obj = to_omap_bo(obj); 847 int ret; 848 849 if (omap_gem_is_contiguous(omap_obj)) 850 return; 851 852 if (refcount_dec_and_test(&omap_obj->pin_cnt)) { 853 if (omap_obj->sgt) { 854 sg_free_table(omap_obj->sgt); 855 kfree(omap_obj->sgt); 856 omap_obj->sgt = NULL; 857 } 858 if (!(omap_obj->flags & OMAP_BO_SCANOUT)) 859 return; 860 if (priv->has_dmm) { 861 ret = tiler_unpin(omap_obj->block); 862 if (ret) { 863 dev_err(obj->dev->dev, 864 "could not unpin pages: %d\n", ret); 865 } 866 ret = tiler_release(omap_obj->block); 867 if (ret) { 868 dev_err(obj->dev->dev, 869 "could not release unmap: %d\n", ret); 870 } 871 omap_obj->dma_addr = 0; 872 omap_obj->block = NULL; 873 } 874 } 875} 876 877/** 878 * omap_gem_unpin() - Unpin a GEM object from memory 879 * @obj: the GEM object 880 * 881 * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are 882 * reference-counted, the actual unpin will only be performed when the number 883 * of calls to this function matches the number of calls to omap_gem_pin(). 884 */ 885void omap_gem_unpin(struct drm_gem_object *obj) 886{ 887 struct omap_gem_object *omap_obj = to_omap_bo(obj); 888 889 mutex_lock(&omap_obj->lock); 890 omap_gem_unpin_locked(obj); 891 mutex_unlock(&omap_obj->lock); 892} 893 894/* Get rotated scanout address (only valid if already pinned), at the 895 * specified orientation and x,y offset from top-left corner of buffer 896 * (only valid for tiled 2d buffers) 897 */ 898int omap_gem_rotated_dma_addr(struct drm_gem_object *obj, u32 orient, 899 int x, int y, dma_addr_t *dma_addr) 900{ 901 struct omap_gem_object *omap_obj = to_omap_bo(obj); 902 int ret = -EINVAL; 903 904 mutex_lock(&omap_obj->lock); 905 906 if ((refcount_read(&omap_obj->pin_cnt) > 0) && omap_obj->block && 907 (omap_obj->flags & OMAP_BO_TILED_MASK)) { 908 *dma_addr = tiler_tsptr(omap_obj->block, orient, x, y); 909 ret = 0; 910 } 911 912 mutex_unlock(&omap_obj->lock); 913 914 return ret; 915} 916 917/* Get tiler stride for the buffer (only valid for 2d tiled buffers) */ 918int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient) 919{ 920 struct omap_gem_object *omap_obj = to_omap_bo(obj); 921 int ret = -EINVAL; 922 if (omap_obj->flags & OMAP_BO_TILED_MASK) 923 ret = tiler_stride(gem2fmt(omap_obj->flags), orient); 924 return ret; 925} 926 927/* if !remap, and we don't have pages backing, then fail, rather than 928 * increasing the pin count (which we don't really do yet anyways, 929 * because we don't support swapping pages back out). And 'remap' 930 * might not be quite the right name, but I wanted to keep it working 931 * similarly to omap_gem_pin(). Note though that mutex is not 932 * aquired if !remap (because this can be called in atomic ctxt), 933 * but probably omap_gem_unpin() should be changed to work in the 934 * same way. If !remap, a matching omap_gem_put_pages() call is not 935 * required (and should not be made). 936 */ 937int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages, 938 bool remap) 939{ 940 struct omap_gem_object *omap_obj = to_omap_bo(obj); 941 int ret = 0; 942 943 mutex_lock(&omap_obj->lock); 944 945 if (remap) { 946 ret = omap_gem_attach_pages(obj); 947 if (ret) 948 goto unlock; 949 } 950 951 if (!omap_obj->pages) { 952 ret = -ENOMEM; 953 goto unlock; 954 } 955 956 *pages = omap_obj->pages; 957 958unlock: 959 mutex_unlock(&omap_obj->lock); 960 961 return ret; 962} 963 964/* release pages when DMA no longer being performed */ 965int omap_gem_put_pages(struct drm_gem_object *obj) 966{ 967 /* do something here if we dynamically attach/detach pages.. at 968 * least they would no longer need to be pinned if everyone has 969 * released the pages.. 970 */ 971 return 0; 972} 973 974struct sg_table *omap_gem_get_sg(struct drm_gem_object *obj, 975 enum dma_data_direction dir) 976{ 977 struct omap_gem_object *omap_obj = to_omap_bo(obj); 978 dma_addr_t addr; 979 struct sg_table *sgt; 980 struct scatterlist *sg; 981 unsigned int count, len, stride, i; 982 int ret; 983 984 ret = omap_gem_pin(obj, &addr); 985 if (ret) 986 return ERR_PTR(ret); 987 988 mutex_lock(&omap_obj->lock); 989 990 sgt = omap_obj->sgt; 991 if (sgt) 992 goto out; 993 994 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 995 if (!sgt) { 996 ret = -ENOMEM; 997 goto err_unpin; 998 } 999 1000 if (addr) { 1001 if (omap_obj->flags & OMAP_BO_TILED_MASK) { 1002 enum tiler_fmt fmt = gem2fmt(omap_obj->flags); 1003 1004 len = omap_obj->width << (int)fmt; 1005 count = omap_obj->height; 1006 stride = tiler_stride(fmt, 0); 1007 } else { 1008 len = obj->size; 1009 count = 1; 1010 stride = 0; 1011 } 1012 } else { 1013 count = obj->size >> PAGE_SHIFT; 1014 } 1015 1016 ret = sg_alloc_table(sgt, count, GFP_KERNEL); 1017 if (ret) 1018 goto err_free; 1019 1020 /* this must be after omap_gem_pin() to ensure we have pages attached */ 1021 omap_gem_dma_sync_buffer(obj, dir); 1022 1023 if (addr) { 1024 for_each_sg(sgt->sgl, sg, count, i) { 1025 sg_set_page(sg, phys_to_page(addr), len, 1026 offset_in_page(addr)); 1027 sg_dma_address(sg) = addr; 1028 sg_dma_len(sg) = len; 1029 1030 addr += stride; 1031 } 1032 } else { 1033 for_each_sg(sgt->sgl, sg, count, i) { 1034 sg_set_page(sg, omap_obj->pages[i], PAGE_SIZE, 0); 1035 sg_dma_address(sg) = omap_obj->dma_addrs[i]; 1036 sg_dma_len(sg) = PAGE_SIZE; 1037 } 1038 } 1039 1040 omap_obj->sgt = sgt; 1041out: 1042 mutex_unlock(&omap_obj->lock); 1043 return sgt; 1044 1045err_free: 1046 kfree(sgt); 1047err_unpin: 1048 mutex_unlock(&omap_obj->lock); 1049 omap_gem_unpin(obj); 1050 return ERR_PTR(ret); 1051} 1052 1053void omap_gem_put_sg(struct drm_gem_object *obj, struct sg_table *sgt) 1054{ 1055 struct omap_gem_object *omap_obj = to_omap_bo(obj); 1056 1057 if (WARN_ON(omap_obj->sgt != sgt)) 1058 return; 1059 1060 omap_gem_unpin(obj); 1061} 1062 1063#ifdef CONFIG_DRM_FBDEV_EMULATION 1064/* 1065 * Get kernel virtual address for CPU access.. this more or less only 1066 * exists for omap_fbdev. 1067 */ 1068void *omap_gem_vaddr(struct drm_gem_object *obj) 1069{ 1070 struct omap_gem_object *omap_obj = to_omap_bo(obj); 1071 void *vaddr; 1072 int ret; 1073 1074 mutex_lock(&omap_obj->lock); 1075 1076 if (!omap_obj->vaddr) { 1077 ret = omap_gem_attach_pages(obj); 1078 if (ret) { 1079 vaddr = ERR_PTR(ret); 1080 goto unlock; 1081 } 1082 1083 omap_obj->vaddr = vmap(omap_obj->pages, obj->size >> PAGE_SHIFT, 1084 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 1085 } 1086 1087 vaddr = omap_obj->vaddr; 1088 1089unlock: 1090 mutex_unlock(&omap_obj->lock); 1091 return vaddr; 1092} 1093#endif 1094 1095/* ----------------------------------------------------------------------------- 1096 * Power Management 1097 */ 1098 1099#ifdef CONFIG_PM 1100/* re-pin objects in DMM in resume path: */ 1101int omap_gem_resume(struct drm_device *dev) 1102{ 1103 struct omap_drm_private *priv = dev->dev_private; 1104 struct omap_gem_object *omap_obj; 1105 int ret = 0; 1106 1107 mutex_lock(&priv->list_lock); 1108 list_for_each_entry(omap_obj, &priv->obj_list, mm_list) { 1109 if (omap_obj->block) { 1110 struct drm_gem_object *obj = &omap_obj->base; 1111 u32 npages = obj->size >> PAGE_SHIFT; 1112 1113 WARN_ON(!omap_obj->pages); /* this can't happen */ 1114 ret = tiler_pin(omap_obj->block, 1115 omap_obj->pages, npages, 1116 omap_obj->roll, true); 1117 if (ret) { 1118 dev_err(dev->dev, "could not repin: %d\n", ret); 1119 goto done; 1120 } 1121 } 1122 } 1123 1124done: 1125 mutex_unlock(&priv->list_lock); 1126 return ret; 1127} 1128#endif 1129 1130/* ----------------------------------------------------------------------------- 1131 * DebugFS 1132 */ 1133 1134#ifdef CONFIG_DEBUG_FS 1135void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 1136{ 1137 struct omap_gem_object *omap_obj = to_omap_bo(obj); 1138 u64 off; 1139 1140 off = drm_vma_node_start(&obj->vma_node); 1141 1142 mutex_lock(&omap_obj->lock); 1143 1144 seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d", 1145 omap_obj->flags, obj->name, kref_read(&obj->refcount), 1146 off, &omap_obj->dma_addr, 1147 refcount_read(&omap_obj->pin_cnt), 1148 omap_obj->vaddr, omap_obj->roll); 1149 1150 if (omap_obj->flags & OMAP_BO_TILED_MASK) { 1151 seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height); 1152 if (omap_obj->block) { 1153 struct tcm_area *area = &omap_obj->block->area; 1154 seq_printf(m, " (%dx%d, %dx%d)", 1155 area->p0.x, area->p0.y, 1156 area->p1.x, area->p1.y); 1157 } 1158 } else { 1159 seq_printf(m, " %zu", obj->size); 1160 } 1161 1162 mutex_unlock(&omap_obj->lock); 1163 1164 seq_printf(m, "\n"); 1165} 1166 1167void omap_gem_describe_objects(struct list_head *list, struct seq_file *m) 1168{ 1169 struct omap_gem_object *omap_obj; 1170 int count = 0; 1171 size_t size = 0; 1172 1173 list_for_each_entry(omap_obj, list, mm_list) { 1174 struct drm_gem_object *obj = &omap_obj->base; 1175 seq_printf(m, " "); 1176 omap_gem_describe(obj, m); 1177 count++; 1178 size += obj->size; 1179 } 1180 1181 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 1182} 1183#endif 1184 1185/* ----------------------------------------------------------------------------- 1186 * Constructor & Destructor 1187 */ 1188 1189static void omap_gem_free_object(struct drm_gem_object *obj) 1190{ 1191 struct drm_device *dev = obj->dev; 1192 struct omap_drm_private *priv = dev->dev_private; 1193 struct omap_gem_object *omap_obj = to_omap_bo(obj); 1194 1195 omap_gem_evict(obj); 1196 1197 mutex_lock(&priv->list_lock); 1198 list_del(&omap_obj->mm_list); 1199 mutex_unlock(&priv->list_lock); 1200 1201 /* 1202 * We own the sole reference to the object at this point, but to keep 1203 * lockdep happy, we must still take the omap_obj_lock to call 1204 * omap_gem_detach_pages(). This should hardly make any difference as 1205 * there can't be any lock contention. 1206 */ 1207 mutex_lock(&omap_obj->lock); 1208 1209 /* The object should not be pinned. */ 1210 WARN_ON(refcount_read(&omap_obj->pin_cnt) > 0); 1211 1212 if (omap_obj->pages) { 1213 if (omap_obj->flags & OMAP_BO_MEM_DMABUF) 1214 kfree(omap_obj->pages); 1215 else 1216 omap_gem_detach_pages(obj); 1217 } 1218 1219 if (omap_obj->flags & OMAP_BO_MEM_DMA_API) { 1220 dma_free_wc(dev->dev, obj->size, omap_obj->vaddr, 1221 omap_obj->dma_addr); 1222 } else if (omap_obj->vaddr) { 1223 vunmap(omap_obj->vaddr); 1224 } else if (obj->import_attach) { 1225 drm_prime_gem_destroy(obj, omap_obj->sgt); 1226 } 1227 1228 mutex_unlock(&omap_obj->lock); 1229 1230 drm_gem_object_release(obj); 1231 1232 mutex_destroy(&omap_obj->lock); 1233 1234 kfree(omap_obj); 1235} 1236 1237static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags) 1238{ 1239 struct omap_drm_private *priv = dev->dev_private; 1240 1241 switch (flags & OMAP_BO_CACHE_MASK) { 1242 case OMAP_BO_CACHED: 1243 case OMAP_BO_WC: 1244 case OMAP_BO_CACHE_MASK: 1245 break; 1246 1247 default: 1248 return false; 1249 } 1250 1251 if (flags & OMAP_BO_TILED_MASK) { 1252 if (!priv->usergart) 1253 return false; 1254 1255 switch (flags & OMAP_BO_TILED_MASK) { 1256 case OMAP_BO_TILED_8: 1257 case OMAP_BO_TILED_16: 1258 case OMAP_BO_TILED_32: 1259 break; 1260 1261 default: 1262 return false; 1263 } 1264 } 1265 1266 return true; 1267} 1268 1269static const struct vm_operations_struct omap_gem_vm_ops = { 1270 .fault = omap_gem_fault, 1271 .open = drm_gem_vm_open, 1272 .close = drm_gem_vm_close, 1273}; 1274 1275static const struct drm_gem_object_funcs omap_gem_object_funcs = { 1276 .free = omap_gem_free_object, 1277 .export = omap_gem_prime_export, 1278 .mmap = omap_gem_object_mmap, 1279 .vm_ops = &omap_gem_vm_ops, 1280}; 1281 1282/* GEM buffer object constructor */ 1283struct drm_gem_object *omap_gem_new(struct drm_device *dev, 1284 union omap_gem_size gsize, u32 flags) 1285{ 1286 struct omap_drm_private *priv = dev->dev_private; 1287 struct omap_gem_object *omap_obj; 1288 struct drm_gem_object *obj; 1289 struct address_space *mapping; 1290 size_t size; 1291 int ret; 1292 1293 if (!omap_gem_validate_flags(dev, flags)) 1294 return NULL; 1295 1296 /* Validate the flags and compute the memory and cache flags. */ 1297 if (flags & OMAP_BO_TILED_MASK) { 1298 /* 1299 * Tiled buffers are always shmem paged backed. When they are 1300 * scanned out, they are remapped into DMM/TILER. 1301 */ 1302 flags |= OMAP_BO_MEM_SHMEM; 1303 1304 /* 1305 * Currently don't allow cached buffers. There is some caching 1306 * stuff that needs to be handled better. 1307 */ 1308 flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED); 1309 flags |= tiler_get_cpu_cache_flags(); 1310 } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) { 1311 /* 1312 * If we don't have DMM, we must allocate scanout buffers 1313 * from contiguous DMA memory. 1314 */ 1315 flags |= OMAP_BO_MEM_DMA_API; 1316 } else if (!(flags & OMAP_BO_MEM_DMABUF)) { 1317 /* 1318 * All other buffers not backed by dma_buf are shmem-backed. 1319 */ 1320 flags |= OMAP_BO_MEM_SHMEM; 1321 } 1322 1323 /* Allocate the initialize the OMAP GEM object. */ 1324 omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL); 1325 if (!omap_obj) 1326 return NULL; 1327 1328 obj = &omap_obj->base; 1329 omap_obj->flags = flags; 1330 mutex_init(&omap_obj->lock); 1331 1332 if (flags & OMAP_BO_TILED_MASK) { 1333 /* 1334 * For tiled buffers align dimensions to slot boundaries and 1335 * calculate size based on aligned dimensions. 1336 */ 1337 tiler_align(gem2fmt(flags), &gsize.tiled.width, 1338 &gsize.tiled.height); 1339 1340 size = tiler_size(gem2fmt(flags), gsize.tiled.width, 1341 gsize.tiled.height); 1342 1343 omap_obj->width = gsize.tiled.width; 1344 omap_obj->height = gsize.tiled.height; 1345 } else { 1346 size = PAGE_ALIGN(gsize.bytes); 1347 } 1348 1349 obj->funcs = &omap_gem_object_funcs; 1350 1351 /* Initialize the GEM object. */ 1352 if (!(flags & OMAP_BO_MEM_SHMEM)) { 1353 drm_gem_private_object_init(dev, obj, size); 1354 } else { 1355 ret = drm_gem_object_init(dev, obj, size); 1356 if (ret) 1357 goto err_free; 1358 1359 mapping = obj->filp->f_mapping; 1360 mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32); 1361 } 1362 1363 /* Allocate memory if needed. */ 1364 if (flags & OMAP_BO_MEM_DMA_API) { 1365 omap_obj->vaddr = dma_alloc_wc(dev->dev, size, 1366 &omap_obj->dma_addr, 1367 GFP_KERNEL); 1368 if (!omap_obj->vaddr) 1369 goto err_release; 1370 } 1371 1372 mutex_lock(&priv->list_lock); 1373 list_add(&omap_obj->mm_list, &priv->obj_list); 1374 mutex_unlock(&priv->list_lock); 1375 1376 return obj; 1377 1378err_release: 1379 drm_gem_object_release(obj); 1380err_free: 1381 kfree(omap_obj); 1382 return NULL; 1383} 1384 1385struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size, 1386 struct sg_table *sgt) 1387{ 1388 struct omap_drm_private *priv = dev->dev_private; 1389 struct omap_gem_object *omap_obj; 1390 struct drm_gem_object *obj; 1391 union omap_gem_size gsize; 1392 1393 /* Without a DMM only physically contiguous buffers can be supported. */ 1394 if (!omap_gem_sgt_is_contiguous(sgt, size) && !priv->has_dmm) 1395 return ERR_PTR(-EINVAL); 1396 1397 gsize.bytes = PAGE_ALIGN(size); 1398 obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC); 1399 if (!obj) 1400 return ERR_PTR(-ENOMEM); 1401 1402 omap_obj = to_omap_bo(obj); 1403 1404 mutex_lock(&omap_obj->lock); 1405 1406 omap_obj->sgt = sgt; 1407 1408 if (omap_gem_sgt_is_contiguous(sgt, size)) { 1409 omap_obj->dma_addr = sg_dma_address(sgt->sgl); 1410 } else { 1411 /* Create pages list from sgt */ 1412 struct page **pages; 1413 unsigned int npages; 1414 unsigned int ret; 1415 1416 npages = DIV_ROUND_UP(size, PAGE_SIZE); 1417 pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL); 1418 if (!pages) { 1419 omap_gem_free_object(obj); 1420 obj = ERR_PTR(-ENOMEM); 1421 goto done; 1422 } 1423 1424 omap_obj->pages = pages; 1425 ret = drm_prime_sg_to_page_array(sgt, pages, npages); 1426 if (ret) { 1427 omap_gem_free_object(obj); 1428 obj = ERR_PTR(-ENOMEM); 1429 goto done; 1430 } 1431 } 1432 1433done: 1434 mutex_unlock(&omap_obj->lock); 1435 return obj; 1436} 1437 1438/* convenience method to construct a GEM buffer object, and userspace handle */ 1439int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file, 1440 union omap_gem_size gsize, u32 flags, u32 *handle) 1441{ 1442 struct drm_gem_object *obj; 1443 int ret; 1444 1445 obj = omap_gem_new(dev, gsize, flags); 1446 if (!obj) 1447 return -ENOMEM; 1448 1449 ret = drm_gem_handle_create(file, obj, handle); 1450 if (ret) { 1451 omap_gem_free_object(obj); 1452 return ret; 1453 } 1454 1455 /* drop reference from allocate - handle holds it now */ 1456 drm_gem_object_put(obj); 1457 1458 return 0; 1459} 1460 1461/* ----------------------------------------------------------------------------- 1462 * Init & Cleanup 1463 */ 1464 1465/* If DMM is used, we need to set some stuff up.. */ 1466void omap_gem_init(struct drm_device *dev) 1467{ 1468 struct omap_drm_private *priv = dev->dev_private; 1469 struct omap_drm_usergart *usergart; 1470 const enum tiler_fmt fmts[] = { 1471 TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT 1472 }; 1473 int i, j; 1474 1475 if (!dmm_is_available()) { 1476 /* DMM only supported on OMAP4 and later, so this isn't fatal */ 1477 dev_warn(dev->dev, "DMM not available, disable DMM support\n"); 1478 return; 1479 } 1480 1481 usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL); 1482 if (!usergart) 1483 return; 1484 1485 /* reserve 4k aligned/wide regions for userspace mappings: */ 1486 for (i = 0; i < ARRAY_SIZE(fmts); i++) { 1487 u16 h = 1, w = PAGE_SIZE >> i; 1488 1489 tiler_align(fmts[i], &w, &h); 1490 /* note: since each region is 1 4kb page wide, and minimum 1491 * number of rows, the height ends up being the same as the 1492 * # of pages in the region 1493 */ 1494 usergart[i].height = h; 1495 usergart[i].height_shift = ilog2(h); 1496 usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT; 1497 usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i); 1498 for (j = 0; j < NUM_USERGART_ENTRIES; j++) { 1499 struct omap_drm_usergart_entry *entry; 1500 struct tiler_block *block; 1501 1502 entry = &usergart[i].entry[j]; 1503 block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE); 1504 if (IS_ERR(block)) { 1505 dev_err(dev->dev, 1506 "reserve failed: %d, %d, %ld\n", 1507 i, j, PTR_ERR(block)); 1508 return; 1509 } 1510 entry->dma_addr = tiler_ssptr(block); 1511 entry->block = block; 1512 1513 DBG("%d:%d: %dx%d: dma_addr=%pad stride=%d", i, j, w, h, 1514 &entry->dma_addr, 1515 usergart[i].stride_pfn << PAGE_SHIFT); 1516 } 1517 } 1518 1519 priv->usergart = usergart; 1520 priv->has_dmm = true; 1521} 1522 1523void omap_gem_deinit(struct drm_device *dev) 1524{ 1525 struct omap_drm_private *priv = dev->dev_private; 1526 1527 /* I believe we can rely on there being no more outstanding GEM 1528 * objects which could depend on usergart/dmm at this point. 1529 */ 1530 kfree(priv->usergart); 1531} 1532