drivers/gpu/drm/omapdrm/omap_gem.c

   1 /*
   2  * drivers/gpu/drm/omapdrm/omap_gem.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <[email protected]>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/shmem_fs.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/pfn_t.h>
  23
  24 #include <drm/drm_vma_manager.h>
  25
  26 #include "omap_drv.h"
  27 #include "omap_dmm_tiler.h"
  28
  29 /*
  30  * GEM buffer object implementation.
  31  */
  32
  33 /* note: we use upper 8 bits of flags for driver-internal flags: */
  34 #define OMAP_BO_MEM_DMA_API     0x01000000      /* memory allocated with the dma_alloc_* API */
  35 #define OMAP_BO_MEM_SHMEM       0x02000000      /* memory allocated through shmem backing */
  36 #define OMAP_BO_MEM_DMABUF      0x08000000      /* memory imported from a dmabuf */
  37
  38 struct omap_gem_object {
  39         struct drm_gem_object base;
  40
  41         struct list_head mm_list;
  42
  43         uint32_t flags;
  44
  45         /** width/height for tiled formats (rounded up to slot boundaries) */
  46         uint16_t width, height;
  47
  48         /** roll applied when mapping to DMM */
  49         uint32_t roll;
  50
  51         /**
  52          * paddr contains the buffer DMA address. It is valid for
  53          *
  54          * - buffers allocated through the DMA mapping API (with the
  55          *   OMAP_BO_MEM_DMA_API flag set)
  56          *
  57          * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
  58          *   if they are physically contiguous (when sgt->orig_nents == 1)
  59          *
  60          * - buffers mapped through the TILER when paddr_cnt is not zero, in
  61          *   which case the DMA address points to the TILER aperture
  62          *
  63          * Physically contiguous buffers have their DMA address equal to the
  64          * physical address as we don't remap those buffers through the TILER.
  65          *
  66          * Buffers mapped to the TILER have their DMA address pointing to the
  67          * TILER aperture. As TILER mappings are refcounted (through paddr_cnt)
  68          * the DMA address must be accessed through omap_get_get_paddr() to
  69          * ensure that the mapping won't disappear unexpectedly. References must
  70          * be released with omap_gem_put_paddr().
  71          */
  72         dma_addr_t paddr;
  73
  74         /**
  75          * # of users of paddr
  76          */
  77         uint32_t paddr_cnt;
  78
  79         /**
  80          * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
  81          * is set and the sgt field is valid.
  82          */
  83         struct sg_table *sgt;
  84
  85         /**
  86          * tiler block used when buffer is remapped in DMM/TILER.
  87          */
  88         struct tiler_block *block;
  89
  90         /**
  91          * Array of backing pages, if allocated.  Note that pages are never
  92          * allocated for buffers originally allocated from contiguous memory
  93          */
  94         struct page **pages;
  95
  96         /** addresses corresponding to pages in above array */
  97         dma_addr_t *addrs;
  98
  99         /**
 100          * Virtual address, if mapped.
 101          */
 102         void *vaddr;
 103
 104         /**
 105          * sync-object allocated on demand (if needed)
 106          *
 107          * Per-buffer sync-object for tracking pending and completed hw/dma
 108          * read and write operations.
 109          */
 110         struct {
 111                 uint32_t write_pending;
 112                 uint32_t write_complete;
 113                 uint32_t read_pending;
 114                 uint32_t read_complete;
 115         } *sync;
 116 };
 117
 118 #define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
 119
 120 /* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
 121  * not necessarily pinned in TILER all the time, and (b) when they are
 122  * they are not necessarily page aligned, we reserve one or more small
 123  * regions in each of the 2d containers to use as a user-GART where we
 124  * can create a second page-aligned mapping of parts of the buffer
 125  * being accessed from userspace.
 126  *
 127  * Note that we could optimize slightly when we know that multiple
 128  * tiler containers are backed by the same PAT.. but I'll leave that
 129  * for later..
 130  */
 131 #define NUM_USERGART_ENTRIES 2
 132 struct omap_drm_usergart_entry {
 133         struct tiler_block *block;      /* the reserved tiler block */
 134         dma_addr_t paddr;
 135         struct drm_gem_object *obj;     /* the current pinned obj */
 136         pgoff_t obj_pgoff;              /* page offset of obj currently
 137                                            mapped in */
 138 };
 139
 140 struct omap_drm_usergart {
 141         struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
 142         int height;                             /* height in rows */
 143         int height_shift;               /* ilog2(height in rows) */
 144         int slot_shift;                 /* ilog2(width per slot) */
 145         int stride_pfn;                 /* stride in pages */
 146         int last;                               /* index of last used entry */
 147 };
 148
 149 /* -----------------------------------------------------------------------------
 150  * Helpers
 151  */
 152
 153 /** get mmap offset */
 154 static uint64_t mmap_offset(struct drm_gem_object *obj)
 155 {
 156         struct drm_device *dev = obj->dev;
 157         int ret;
 158         size_t size;
 159
 160         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 161
 162         /* Make it mmapable */
 163         size = omap_gem_mmap_size(obj);
 164         ret = drm_gem_create_mmap_offset_size(obj, size);
 165         if (ret) {
 166                 dev_err(dev->dev, "could not allocate mmap offset\n");
 167                 return 0;
 168         }
 169
 170         return drm_vma_node_offset_addr(&obj->vma_node);
 171 }
 172
 173 static bool is_contiguous(struct omap_gem_object *omap_obj)
 174 {
 175         if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
 176                 return true;
 177
 178         if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
 179                 return true;
 180
 181         return false;
 182 }
 183
 184 /* -----------------------------------------------------------------------------
 185  * Eviction
 186  */
 187
 188 static void evict_entry(struct drm_gem_object *obj,
 189                 enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
 190 {
 191         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 192         struct omap_drm_private *priv = obj->dev->dev_private;
 193         int n = priv->usergart[fmt].height;
 194         size_t size = PAGE_SIZE * n;
 195         loff_t off = mmap_offset(obj) +
 196                         (entry->obj_pgoff << PAGE_SHIFT);
 197         const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
 198
 199         if (m > 1) {
 200                 int i;
 201                 /* if stride > than PAGE_SIZE then sparse mapping: */
 202                 for (i = n; i > 0; i--) {
 203                         unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 204                                             off, PAGE_SIZE, 1);
 205                         off += PAGE_SIZE * m;
 206                 }
 207         } else {
 208                 unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 209                                     off, size, 1);
 210         }
 211
 212         entry->obj = NULL;
 213 }
 214
 215 /* Evict a buffer from usergart, if it is mapped there */
 216 static void evict(struct drm_gem_object *obj)
 217 {
 218         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 219         struct omap_drm_private *priv = obj->dev->dev_private;
 220
 221         if (omap_obj->flags & OMAP_BO_TILED) {
 222                 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 223                 int i;
 224
 225                 for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
 226                         struct omap_drm_usergart_entry *entry =
 227                                 &priv->usergart[fmt].entry[i];
 228
 229                         if (entry->obj == obj)
 230                                 evict_entry(obj, fmt, entry);
 231                 }
 232         }
 233 }
 234
 235 /* -----------------------------------------------------------------------------
 236  * Page Management
 237  */
 238
 239 /** ensure backing pages are allocated */
 240 static int omap_gem_attach_pages(struct drm_gem_object *obj)
 241 {
 242         struct drm_device *dev = obj->dev;
 243         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 244         struct page **pages;
 245         int npages = obj->size >> PAGE_SHIFT;
 246         int i, ret;
 247         dma_addr_t *addrs;
 248
 249         WARN_ON(omap_obj->pages);
 250
 251         pages = drm_gem_get_pages(obj);
 252         if (IS_ERR(pages)) {
 253                 dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
 254                 return PTR_ERR(pages);
 255         }
 256
 257         /* for non-cached buffers, ensure the new pages are clean because
 258          * DSS, GPU, etc. are not cache coherent:
 259          */
 260         if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 261                 addrs = kmalloc(npages * sizeof(*addrs), GFP_KERNEL);
 262                 if (!addrs) {
 263                         ret = -ENOMEM;
 264                         goto free_pages;
 265                 }
 266
 267                 for (i = 0; i < npages; i++) {
 268                         addrs[i] = dma_map_page(dev->dev, pages[i],
 269                                         0, PAGE_SIZE, DMA_BIDIRECTIONAL);
 270
 271                         if (dma_mapping_error(dev->dev, addrs[i])) {
 272                                 dev_warn(dev->dev,
 273                                         "%s: failed to map page\n", __func__);
 274
 275                                 for (i = i - 1; i >= 0; --i) {
 276                                         dma_unmap_page(dev->dev, addrs[i],
 277                                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
 278                                 }
 279
 280                                 ret = -ENOMEM;
 281                                 goto free_addrs;
 282                         }
 283                 }
 284         } else {
 285                 addrs = kzalloc(npages * sizeof(*addrs), GFP_KERNEL);
 286                 if (!addrs) {
 287                         ret = -ENOMEM;
 288                         goto free_pages;
 289                 }
 290         }
 291
 292         omap_obj->addrs = addrs;
 293         omap_obj->pages = pages;
 294
 295         return 0;
 296
 297 free_addrs:
 298         kfree(addrs);
 299 free_pages:
 300         drm_gem_put_pages(obj, pages, true, false);
 301
 302         return ret;
 303 }
 304
 305 /* acquire pages when needed (for example, for DMA where physically
 306  * contiguous buffer is not required
 307  */
 308 static int get_pages(struct drm_gem_object *obj, struct page ***pages)
 309 {
 310         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 311         int ret = 0;
 312
 313         if ((omap_obj->flags & OMAP_BO_MEM_SHMEM) && !omap_obj->pages) {
 314                 ret = omap_gem_attach_pages(obj);
 315                 if (ret) {
 316                         dev_err(obj->dev->dev, "could not attach pages\n");
 317                         return ret;
 318                 }
 319         }
 320
 321         /* TODO: even phys-contig.. we should have a list of pages? */
 322         *pages = omap_obj->pages;
 323
 324         return 0;
 325 }
 326
 327 /** release backing pages */
 328 static void omap_gem_detach_pages(struct drm_gem_object *obj)
 329 {
 330         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 331
 332         /* for non-cached buffers, ensure the new pages are clean because
 333          * DSS, GPU, etc. are not cache coherent:
 334          */
 335         if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 336                 int i, npages = obj->size >> PAGE_SHIFT;
 337                 for (i = 0; i < npages; i++) {
 338                         dma_unmap_page(obj->dev->dev, omap_obj->addrs[i],
 339                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
 340                 }
 341         }
 342
 343         kfree(omap_obj->addrs);
 344         omap_obj->addrs = NULL;
 345
 346         drm_gem_put_pages(obj, omap_obj->pages, true, false);
 347         omap_obj->pages = NULL;
 348 }
 349
 350 /* get buffer flags */
 351 uint32_t omap_gem_flags(struct drm_gem_object *obj)
 352 {
 353         return to_omap_bo(obj)->flags;
 354 }
 355
 356 uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj)
 357 {
 358         uint64_t offset;
 359         mutex_lock(&obj->dev->struct_mutex);
 360         offset = mmap_offset(obj);
 361         mutex_unlock(&obj->dev->struct_mutex);
 362         return offset;
 363 }
 364
 365 /** get mmap size */
 366 size_t omap_gem_mmap_size(struct drm_gem_object *obj)
 367 {
 368         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 369         size_t size = obj->size;
 370
 371         if (omap_obj->flags & OMAP_BO_TILED) {
 372                 /* for tiled buffers, the virtual size has stride rounded up
 373                  * to 4kb.. (to hide the fact that row n+1 might start 16kb or
 374                  * 32kb later!).  But we don't back the entire buffer with
 375                  * pages, only the valid picture part.. so need to adjust for
 376                  * this in the size used to mmap and generate mmap offset
 377                  */
 378                 size = tiler_vsize(gem2fmt(omap_obj->flags),
 379                                 omap_obj->width, omap_obj->height);
 380         }
 381
 382         return size;
 383 }
 384
 385 /* get tiled size, returns -EINVAL if not tiled buffer */
 386 int omap_gem_tiled_size(struct drm_gem_object *obj, uint16_t *w, uint16_t *h)
 387 {
 388         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 389         if (omap_obj->flags & OMAP_BO_TILED) {
 390                 *w = omap_obj->width;
 391                 *h = omap_obj->height;
 392                 return 0;
 393         }
 394         return -EINVAL;
 395 }
 396
 397 /* -----------------------------------------------------------------------------
 398  * Fault Handling
 399  */
 400
 401 /* Normal handling for the case of faulting in non-tiled buffers */
 402 static int fault_1d(struct drm_gem_object *obj,
 403                 struct vm_area_struct *vma, struct vm_fault *vmf)
 404 {
 405         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 406         unsigned long pfn;
 407         pgoff_t pgoff;
 408
 409         /* We don't use vmf->pgoff since that has the fake offset: */
 410         pgoff = ((unsigned long)vmf->virtual_address -
 411                         vma->vm_start) >> PAGE_SHIFT;
 412
 413         if (omap_obj->pages) {
 414                 omap_gem_cpu_sync(obj, pgoff);
 415                 pfn = page_to_pfn(omap_obj->pages[pgoff]);
 416         } else {
 417                 BUG_ON(!is_contiguous(omap_obj));
 418                 pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff;
 419         }
 420
 421         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 422                         pfn, pfn << PAGE_SHIFT);
 423
 424         return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
 425                         __pfn_to_pfn_t(pfn, PFN_DEV));
 426 }
 427
 428 /* Special handling for the case of faulting in 2d tiled buffers */
 429 static int fault_2d(struct drm_gem_object *obj,
 430                 struct vm_area_struct *vma, struct vm_fault *vmf)
 431 {
 432         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 433         struct omap_drm_private *priv = obj->dev->dev_private;
 434         struct omap_drm_usergart_entry *entry;
 435         enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 436         struct page *pages[64];  /* XXX is this too much to have on stack? */
 437         unsigned long pfn;
 438         pgoff_t pgoff, base_pgoff;
 439         void __user *vaddr;
 440         int i, ret, slots;
 441
 442         /*
 443          * Note the height of the slot is also equal to the number of pages
 444          * that need to be mapped in to fill 4kb wide CPU page.  If the slot
 445          * height is 64, then 64 pages fill a 4kb wide by 64 row region.
 446          */
 447         const int n = priv->usergart[fmt].height;
 448         const int n_shift = priv->usergart[fmt].height_shift;
 449
 450         /*
 451          * If buffer width in bytes > PAGE_SIZE then the virtual stride is
 452          * rounded up to next multiple of PAGE_SIZE.. this need to be taken
 453          * into account in some of the math, so figure out virtual stride
 454          * in pages
 455          */
 456         const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
 457
 458         /* We don't use vmf->pgoff since that has the fake offset: */
 459         pgoff = ((unsigned long)vmf->virtual_address -
 460                         vma->vm_start) >> PAGE_SHIFT;
 461
 462         /*
 463          * Actual address we start mapping at is rounded down to previous slot
 464          * boundary in the y direction:
 465          */
 466         base_pgoff = round_down(pgoff, m << n_shift);
 467
 468         /* figure out buffer width in slots */
 469         slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
 470
 471         vaddr = vmf->virtual_address - ((pgoff - base_pgoff) << PAGE_SHIFT);
 472
 473         entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
 474
 475         /* evict previous buffer using this usergart entry, if any: */
 476         if (entry->obj)
 477                 evict_entry(entry->obj, fmt, entry);
 478
 479         entry->obj = obj;
 480         entry->obj_pgoff = base_pgoff;
 481
 482         /* now convert base_pgoff to phys offset from virt offset: */
 483         base_pgoff = (base_pgoff >> n_shift) * slots;
 484
 485         /* for wider-than 4k.. figure out which part of the slot-row we want: */
 486         if (m > 1) {
 487                 int off = pgoff % m;
 488                 entry->obj_pgoff += off;
 489                 base_pgoff /= m;
 490                 slots = min(slots - (off << n_shift), n);
 491                 base_pgoff += off << n_shift;
 492                 vaddr += off << PAGE_SHIFT;
 493         }
 494
 495         /*
 496          * Map in pages. Beyond the valid pixel part of the buffer, we set
 497          * pages[i] to NULL to get a dummy page mapped in.. if someone
 498          * reads/writes it they will get random/undefined content, but at
 499          * least it won't be corrupting whatever other random page used to
 500          * be mapped in, or other undefined behavior.
 501          */
 502         memcpy(pages, &omap_obj->pages[base_pgoff],
 503                         sizeof(struct page *) * slots);
 504         memset(pages + slots, 0,
 505                         sizeof(struct page *) * (n - slots));
 506
 507         ret = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
 508         if (ret) {
 509                 dev_err(obj->dev->dev, "failed to pin: %d\n", ret);
 510                 return ret;
 511         }
 512
 513         pfn = entry->paddr >> PAGE_SHIFT;
 514
 515         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 516                         pfn, pfn << PAGE_SHIFT);
 517
 518         for (i = n; i > 0; i--) {
 519                 vm_insert_mixed(vma, (unsigned long)vaddr,
 520                                 __pfn_to_pfn_t(pfn, PFN_DEV));
 521                 pfn += priv->usergart[fmt].stride_pfn;
 522                 vaddr += PAGE_SIZE * m;
 523         }
 524
 525         /* simple round-robin: */
 526         priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
 527                                  % NUM_USERGART_ENTRIES;
 528
 529         return 0;
 530 }
 531
 532 /**
 533  * omap_gem_fault               -       pagefault handler for GEM objects
 534  * @vma: the VMA of the GEM object
 535  * @vmf: fault detail
 536  *
 537  * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
 538  * does most of the work for us including the actual map/unmap calls
 539  * but we need to do the actual page work.
 540  *
 541  * The VMA was set up by GEM. In doing so it also ensured that the
 542  * vma->vm_private_data points to the GEM object that is backing this
 543  * mapping.
 544  */
 545 int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 546 {
 547         struct drm_gem_object *obj = vma->vm_private_data;
 548         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 549         struct drm_device *dev = obj->dev;
 550         struct page **pages;
 551         int ret;
 552
 553         /* Make sure we don't parallel update on a fault, nor move or remove
 554          * something from beneath our feet
 555          */
 556         mutex_lock(&dev->struct_mutex);
 557
 558         /* if a shmem backed object, make sure we have pages attached now */
 559         ret = get_pages(obj, &pages);
 560         if (ret)
 561                 goto fail;
 562
 563         /* where should we do corresponding put_pages().. we are mapping
 564          * the original page, rather than thru a GART, so we can't rely
 565          * on eviction to trigger this.  But munmap() or all mappings should
 566          * probably trigger put_pages()?
 567          */
 568
 569         if (omap_obj->flags & OMAP_BO_TILED)
 570                 ret = fault_2d(obj, vma, vmf);
 571         else
 572                 ret = fault_1d(obj, vma, vmf);
 573
 574
 575 fail:
 576         mutex_unlock(&dev->struct_mutex);
 577         switch (ret) {
 578         case 0:
 579         case -ERESTARTSYS:
 580         case -EINTR:
 581         case -EBUSY:
 582                 /*
 583                  * EBUSY is ok: this just means that another thread
 584                  * already did the job.
 585                  */
 586                 return VM_FAULT_NOPAGE;
 587         case -ENOMEM:
 588                 return VM_FAULT_OOM;
 589         default:
 590                 return VM_FAULT_SIGBUS;
 591         }
 592 }
 593
 594 /** We override mainly to fix up some of the vm mapping flags.. */
 595 int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 596 {
 597         int ret;
 598
 599         ret = drm_gem_mmap(filp, vma);
 600         if (ret) {
 601                 DBG("mmap failed: %d", ret);
 602                 return ret;
 603         }
 604
 605         return omap_gem_mmap_obj(vma->vm_private_data, vma);
 606 }
 607
 608 int omap_gem_mmap_obj(struct drm_gem_object *obj,
 609                 struct vm_area_struct *vma)
 610 {
 611         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 612
 613         vma->vm_flags &= ~VM_PFNMAP;
 614         vma->vm_flags |= VM_MIXEDMAP;
 615
 616         if (omap_obj->flags & OMAP_BO_WC) {
 617                 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 618         } else if (omap_obj->flags & OMAP_BO_UNCACHED) {
 619                 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 620         } else {
 621                 /*
 622                  * We do have some private objects, at least for scanout buffers
 623                  * on hardware without DMM/TILER.  But these are allocated write-
 624                  * combine
 625                  */
 626                 if (WARN_ON(!obj->filp))
 627                         return -EINVAL;
 628
 629                 /*
 630                  * Shunt off cached objs to shmem file so they have their own
 631                  * address_space (so unmap_mapping_range does what we want,
 632                  * in particular in the case of mmap'd dmabufs)
 633                  */
 634                 fput(vma->vm_file);
 635                 vma->vm_pgoff = 0;
 636                 vma->vm_file  = get_file(obj->filp);
 637
 638                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 639         }
 640
 641         return 0;
 642 }
 643
 644 /* -----------------------------------------------------------------------------
 645  * Dumb Buffers
 646  */
 647
 648 /**
 649  * omap_gem_dumb_create -       create a dumb buffer
 650  * @drm_file: our client file
 651  * @dev: our device
 652  * @args: the requested arguments copied from userspace
 653  *
 654  * Allocate a buffer suitable for use for a frame buffer of the
 655  * form described by user space. Give userspace a handle by which
 656  * to reference it.
 657  */
 658 int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 659                 struct drm_mode_create_dumb *args)
 660 {
 661         union omap_gem_size gsize;
 662
 663         args->pitch = align_pitch(0, args->width, args->bpp);
 664         args->size = PAGE_ALIGN(args->pitch * args->height);
 665
 666         gsize = (union omap_gem_size){
 667                 .bytes = args->size,
 668         };
 669
 670         return omap_gem_new_handle(dev, file, gsize,
 671                         OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
 672 }
 673
 674 /**
 675  * omap_gem_dumb_map    -       buffer mapping for dumb interface
 676  * @file: our drm client file
 677  * @dev: drm device
 678  * @handle: GEM handle to the object (from dumb_create)
 679  *
 680  * Do the necessary setup to allow the mapping of the frame buffer
 681  * into user memory. We don't have to do much here at the moment.
 682  */
 683 int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 684                 uint32_t handle, uint64_t *offset)
 685 {
 686         struct drm_gem_object *obj;
 687         int ret = 0;
 688
 689         /* GEM does all our handle to object mapping */
 690         obj = drm_gem_object_lookup(dev, file, handle);
 691         if (obj == NULL) {
 692                 ret = -ENOENT;
 693                 goto fail;
 694         }
 695
 696         *offset = omap_gem_mmap_offset(obj);
 697
 698         drm_gem_object_unreference_unlocked(obj);
 699
 700 fail:
 701         return ret;
 702 }
 703
 704 #ifdef CONFIG_DRM_FBDEV_EMULATION
 705 /* Set scrolling position.  This allows us to implement fast scrolling
 706  * for console.
 707  *
 708  * Call only from non-atomic contexts.
 709  */
 710 int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll)
 711 {
 712         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 713         uint32_t npages = obj->size >> PAGE_SHIFT;
 714         int ret = 0;
 715
 716         if (roll > npages) {
 717                 dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
 718                 return -EINVAL;
 719         }
 720
 721         omap_obj->roll = roll;
 722
 723         mutex_lock(&obj->dev->struct_mutex);
 724
 725         /* if we aren't mapped yet, we don't need to do anything */
 726         if (omap_obj->block) {
 727                 struct page **pages;
 728                 ret = get_pages(obj, &pages);
 729                 if (ret)
 730                         goto fail;
 731                 ret = tiler_pin(omap_obj->block, pages, npages, roll, true);
 732                 if (ret)
 733                         dev_err(obj->dev->dev, "could not repin: %d\n", ret);
 734         }
 735
 736 fail:
 737         mutex_unlock(&obj->dev->struct_mutex);
 738
 739         return ret;
 740 }
 741 #endif
 742
 743 /* -----------------------------------------------------------------------------
 744  * Memory Management & DMA Sync
 745  */
 746
 747 /**
 748  * shmem buffers that are mapped cached can simulate coherency via using
 749  * page faulting to keep track of dirty pages
 750  */
 751 static inline bool is_cached_coherent(struct drm_gem_object *obj)
 752 {
 753         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 754
 755         return (omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
 756                 ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED);
 757 }
 758
 759 /* Sync the buffer for CPU access.. note pages should already be
 760  * attached, ie. omap_gem_get_pages()
 761  */
 762 void omap_gem_cpu_sync(struct drm_gem_object *obj, int pgoff)
 763 {
 764         struct drm_device *dev = obj->dev;
 765         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 766
 767         if (is_cached_coherent(obj) && omap_obj->addrs[pgoff]) {
 768                 dma_unmap_page(dev->dev, omap_obj->addrs[pgoff],
 769                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
 770                 omap_obj->addrs[pgoff] = 0;
 771         }
 772 }
 773
 774 /* sync the buffer for DMA access */
 775 void omap_gem_dma_sync(struct drm_gem_object *obj,
 776                 enum dma_data_direction dir)
 777 {
 778         struct drm_device *dev = obj->dev;
 779         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 780
 781         if (is_cached_coherent(obj)) {
 782                 int i, npages = obj->size >> PAGE_SHIFT;
 783                 struct page **pages = omap_obj->pages;
 784                 bool dirty = false;
 785
 786                 for (i = 0; i < npages; i++) {
 787                         if (!omap_obj->addrs[i]) {
 788                                 dma_addr_t addr;
 789
 790                                 addr = dma_map_page(dev->dev, pages[i], 0,
 791                                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
 792
 793                                 if (dma_mapping_error(dev->dev, addr)) {
 794                                         dev_warn(dev->dev,
 795                                                 "%s: failed to map page\n",
 796                                                 __func__);
 797                                         break;
 798                                 }
 799
 800                                 dirty = true;
 801                                 omap_obj->addrs[i] = addr;
 802                         }
 803                 }
 804
 805                 if (dirty) {
 806                         unmap_mapping_range(obj->filp->f_mapping, 0,
 807                                         omap_gem_mmap_size(obj), 1);
 808                 }
 809         }
 810 }
 811
 812 /* Get physical address for DMA.. if 'remap' is true, and the buffer is not
 813  * already contiguous, remap it to pin in physically contiguous memory.. (ie.
 814  * map in TILER)
 815  */
 816 int omap_gem_get_paddr(struct drm_gem_object *obj,
 817                 dma_addr_t *paddr, bool remap)
 818 {
 819         struct omap_drm_private *priv = obj->dev->dev_private;
 820         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 821         int ret = 0;
 822
 823         mutex_lock(&obj->dev->struct_mutex);
 824
 825         if (!is_contiguous(omap_obj) && remap && priv->has_dmm) {
 826                 if (omap_obj->paddr_cnt == 0) {
 827                         struct page **pages;
 828                         uint32_t npages = obj->size >> PAGE_SHIFT;
 829                         enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 830                         struct tiler_block *block;
 831
 832                         BUG_ON(omap_obj->block);
 833
 834                         ret = get_pages(obj, &pages);
 835                         if (ret)
 836                                 goto fail;
 837
 838                         if (omap_obj->flags & OMAP_BO_TILED) {
 839                                 block = tiler_reserve_2d(fmt,
 840                                                 omap_obj->width,
 841                                                 omap_obj->height, 0);
 842                         } else {
 843                                 block = tiler_reserve_1d(obj->size);
 844                         }
 845
 846                         if (IS_ERR(block)) {
 847                                 ret = PTR_ERR(block);
 848                                 dev_err(obj->dev->dev,
 849                                         "could not remap: %d (%d)\n", ret, fmt);
 850                                 goto fail;
 851                         }
 852
 853                         /* TODO: enable async refill.. */
 854                         ret = tiler_pin(block, pages, npages,
 855                                         omap_obj->roll, true);
 856                         if (ret) {
 857                                 tiler_release(block);
 858                                 dev_err(obj->dev->dev,
 859                                                 "could not pin: %d\n", ret);
 860                                 goto fail;
 861                         }
 862
 863                         omap_obj->paddr = tiler_ssptr(block);
 864                         omap_obj->block = block;
 865
 866                         DBG("got paddr: %pad", &omap_obj->paddr);
 867                 }
 868
 869                 omap_obj->paddr_cnt++;
 870
 871                 *paddr = omap_obj->paddr;
 872         } else if (is_contiguous(omap_obj)) {
 873                 *paddr = omap_obj->paddr;
 874         } else {
 875                 ret = -EINVAL;
 876                 goto fail;
 877         }
 878
 879 fail:
 880         mutex_unlock(&obj->dev->struct_mutex);
 881
 882         return ret;
 883 }
 884
 885 /* Release physical address, when DMA is no longer being performed.. this
 886  * could potentially unpin and unmap buffers from TILER
 887  */
 888 void omap_gem_put_paddr(struct drm_gem_object *obj)
 889 {
 890         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 891         int ret;
 892
 893         mutex_lock(&obj->dev->struct_mutex);
 894         if (omap_obj->paddr_cnt > 0) {
 895                 omap_obj->paddr_cnt--;
 896                 if (omap_obj->paddr_cnt == 0) {
 897                         ret = tiler_unpin(omap_obj->block);
 898                         if (ret) {
 899                                 dev_err(obj->dev->dev,
 900                                         "could not unpin pages: %d\n", ret);
 901                         }
 902                         ret = tiler_release(omap_obj->block);
 903                         if (ret) {
 904                                 dev_err(obj->dev->dev,
 905                                         "could not release unmap: %d\n", ret);
 906                         }
 907                         omap_obj->paddr = 0;
 908                         omap_obj->block = NULL;
 909                 }
 910         }
 911
 912         mutex_unlock(&obj->dev->struct_mutex);
 913 }
 914
 915 /* Get rotated scanout address (only valid if already pinned), at the
 916  * specified orientation and x,y offset from top-left corner of buffer
 917  * (only valid for tiled 2d buffers)
 918  */
 919 int omap_gem_rotated_paddr(struct drm_gem_object *obj, uint32_t orient,
 920                 int x, int y, dma_addr_t *paddr)
 921 {
 922         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 923         int ret = -EINVAL;
 924
 925         mutex_lock(&obj->dev->struct_mutex);
 926         if ((omap_obj->paddr_cnt > 0) && omap_obj->block &&
 927                         (omap_obj->flags & OMAP_BO_TILED)) {
 928                 *paddr = tiler_tsptr(omap_obj->block, orient, x, y);
 929                 ret = 0;
 930         }
 931         mutex_unlock(&obj->dev->struct_mutex);
 932         return ret;
 933 }
 934
 935 /* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
 936 int omap_gem_tiled_stride(struct drm_gem_object *obj, uint32_t orient)
 937 {
 938         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 939         int ret = -EINVAL;
 940         if (omap_obj->flags & OMAP_BO_TILED)
 941                 ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
 942         return ret;
 943 }
 944
 945 /* if !remap, and we don't have pages backing, then fail, rather than
 946  * increasing the pin count (which we don't really do yet anyways,
 947  * because we don't support swapping pages back out).  And 'remap'
 948  * might not be quite the right name, but I wanted to keep it working
 949  * similarly to omap_gem_get_paddr().  Note though that mutex is not
 950  * aquired if !remap (because this can be called in atomic ctxt),
 951  * but probably omap_gem_get_paddr() should be changed to work in the
 952  * same way.  If !remap, a matching omap_gem_put_pages() call is not
 953  * required (and should not be made).
 954  */
 955 int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
 956                 bool remap)
 957 {
 958         int ret;
 959         if (!remap) {
 960                 struct omap_gem_object *omap_obj = to_omap_bo(obj);
 961                 if (!omap_obj->pages)
 962                         return -ENOMEM;
 963                 *pages = omap_obj->pages;
 964                 return 0;
 965         }
 966         mutex_lock(&obj->dev->struct_mutex);
 967         ret = get_pages(obj, pages);
 968         mutex_unlock(&obj->dev->struct_mutex);
 969         return ret;
 970 }
 971
 972 /* release pages when DMA no longer being performed */
 973 int omap_gem_put_pages(struct drm_gem_object *obj)
 974 {
 975         /* do something here if we dynamically attach/detach pages.. at
 976          * least they would no longer need to be pinned if everyone has
 977          * released the pages..
 978          */
 979         return 0;
 980 }
 981
 982 #ifdef CONFIG_DRM_FBDEV_EMULATION
 983 /* Get kernel virtual address for CPU access.. this more or less only
 984  * exists for omap_fbdev.  This should be called with struct_mutex
 985  * held.
 986  */
 987 void *omap_gem_vaddr(struct drm_gem_object *obj)
 988 {
 989         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 990         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 991         if (!omap_obj->vaddr) {
 992                 struct page **pages;
 993                 int ret = get_pages(obj, &pages);
 994                 if (ret)
 995                         return ERR_PTR(ret);
 996                 omap_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 997                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 998         }
 999         return omap_obj->vaddr;
1000 }
1001 #endif
1002
1003 /* -----------------------------------------------------------------------------
1004  * Power Management
1005  */
1006
1007 #ifdef CONFIG_PM
1008 /* re-pin objects in DMM in resume path: */
1009 int omap_gem_resume(struct device *dev)
1010 {
1011         struct drm_device *drm_dev = dev_get_drvdata(dev);
1012         struct omap_drm_private *priv = drm_dev->dev_private;
1013         struct omap_gem_object *omap_obj;
1014         int ret = 0;
1015
1016         list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
1017                 if (omap_obj->block) {
1018                         struct drm_gem_object *obj = &omap_obj->base;
1019                         uint32_t npages = obj->size >> PAGE_SHIFT;
1020                         WARN_ON(!omap_obj->pages);  /* this can't happen */
1021                         ret = tiler_pin(omap_obj->block,
1022                                         omap_obj->pages, npages,
1023                                         omap_obj->roll, true);
1024                         if (ret) {
1025                                 dev_err(dev, "could not repin: %d\n", ret);
1026                                 return ret;
1027                         }
1028                 }
1029         }
1030
1031         return 0;
1032 }
1033 #endif
1034
1035 /* -----------------------------------------------------------------------------
1036  * DebugFS
1037  */
1038
1039 #ifdef CONFIG_DEBUG_FS
1040 void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
1041 {
1042         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1043         uint64_t off;
1044
1045         off = drm_vma_node_start(&obj->vma_node);
1046
1047         seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
1048                         omap_obj->flags, obj->name, obj->refcount.refcount.counter,
1049                         off, &omap_obj->paddr, omap_obj->paddr_cnt,
1050                         omap_obj->vaddr, omap_obj->roll);
1051
1052         if (omap_obj->flags & OMAP_BO_TILED) {
1053                 seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
1054                 if (omap_obj->block) {
1055                         struct tcm_area *area = &omap_obj->block->area;
1056                         seq_printf(m, " (%dx%d, %dx%d)",
1057                                         area->p0.x, area->p0.y,
1058                                         area->p1.x, area->p1.y);
1059                 }
1060         } else {
1061                 seq_printf(m, " %d", obj->size);
1062         }
1063
1064         seq_printf(m, "\n");
1065 }
1066
1067 void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
1068 {
1069         struct omap_gem_object *omap_obj;
1070         int count = 0;
1071         size_t size = 0;
1072
1073         list_for_each_entry(omap_obj, list, mm_list) {
1074                 struct drm_gem_object *obj = &omap_obj->base;
1075                 seq_printf(m, "   ");
1076                 omap_gem_describe(obj, m);
1077                 count++;
1078                 size += obj->size;
1079         }
1080
1081         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
1082 }
1083 #endif
1084
1085 /* -----------------------------------------------------------------------------
1086  * Buffer Synchronization
1087  */
1088
1089 static DEFINE_SPINLOCK(sync_lock);
1090
1091 struct omap_gem_sync_waiter {
1092         struct list_head list;
1093         struct omap_gem_object *omap_obj;
1094         enum omap_gem_op op;
1095         uint32_t read_target, write_target;
1096         /* notify called w/ sync_lock held */
1097         void (*notify)(void *arg);
1098         void *arg;
1099 };
1100
1101 /* list of omap_gem_sync_waiter.. the notify fxn gets called back when
1102  * the read and/or write target count is achieved which can call a user
1103  * callback (ex. to kick 3d and/or 2d), wakeup blocked task (prep for
1104  * cpu access), etc.
1105  */
1106 static LIST_HEAD(waiters);
1107
1108 static inline bool is_waiting(struct omap_gem_sync_waiter *waiter)
1109 {
1110         struct omap_gem_object *omap_obj = waiter->omap_obj;
1111         if ((waiter->op & OMAP_GEM_READ) &&
1112                         (omap_obj->sync->write_complete < waiter->write_target))
1113                 return true;
1114         if ((waiter->op & OMAP_GEM_WRITE) &&
1115                         (omap_obj->sync->read_complete < waiter->read_target))
1116                 return true;
1117         return false;
1118 }
1119
1120 /* macro for sync debug.. */
1121 #define SYNCDBG 0
1122 #define SYNC(fmt, ...) do { if (SYNCDBG) \
1123                 printk(KERN_ERR "%s:%d: "fmt"\n", \
1124                                 __func__, __LINE__, ##__VA_ARGS__); \
1125         } while (0)
1126
1127
1128 static void sync_op_update(void)
1129 {
1130         struct omap_gem_sync_waiter *waiter, *n;
1131         list_for_each_entry_safe(waiter, n, &waiters, list) {
1132                 if (!is_waiting(waiter)) {
1133                         list_del(&waiter->list);
1134                         SYNC("notify: %p", waiter);
1135                         waiter->notify(waiter->arg);
1136                         kfree(waiter);
1137                 }
1138         }
1139 }
1140
1141 static inline int sync_op(struct drm_gem_object *obj,
1142                 enum omap_gem_op op, bool start)
1143 {
1144         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1145         int ret = 0;
1146
1147         spin_lock(&sync_lock);
1148
1149         if (!omap_obj->sync) {
1150                 omap_obj->sync = kzalloc(sizeof(*omap_obj->sync), GFP_ATOMIC);
1151                 if (!omap_obj->sync) {
1152                         ret = -ENOMEM;
1153                         goto unlock;
1154                 }
1155         }
1156
1157         if (start) {
1158                 if (op & OMAP_GEM_READ)
1159                         omap_obj->sync->read_pending++;
1160                 if (op & OMAP_GEM_WRITE)
1161                         omap_obj->sync->write_pending++;
1162         } else {
1163                 if (op & OMAP_GEM_READ)
1164                         omap_obj->sync->read_complete++;
1165                 if (op & OMAP_GEM_WRITE)
1166                         omap_obj->sync->write_complete++;
1167                 sync_op_update();
1168         }
1169
1170 unlock:
1171         spin_unlock(&sync_lock);
1172
1173         return ret;
1174 }
1175
1176 /* mark the start of read and/or write operation */
1177 int omap_gem_op_start(struct drm_gem_object *obj, enum omap_gem_op op)
1178 {
1179         return sync_op(obj, op, true);
1180 }
1181
1182 int omap_gem_op_finish(struct drm_gem_object *obj, enum omap_gem_op op)
1183 {
1184         return sync_op(obj, op, false);
1185 }
1186
1187 static DECLARE_WAIT_QUEUE_HEAD(sync_event);
1188
1189 static void sync_notify(void *arg)
1190 {
1191         struct task_struct **waiter_task = arg;
1192         *waiter_task = NULL;
1193         wake_up_all(&sync_event);
1194 }
1195
1196 int omap_gem_op_sync(struct drm_gem_object *obj, enum omap_gem_op op)
1197 {
1198         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1199         int ret = 0;
1200         if (omap_obj->sync) {
1201                 struct task_struct *waiter_task = current;
1202                 struct omap_gem_sync_waiter *waiter =
1203                                 kzalloc(sizeof(*waiter), GFP_KERNEL);
1204
1205                 if (!waiter)
1206                         return -ENOMEM;
1207
1208                 waiter->omap_obj = omap_obj;
1209                 waiter->op = op;
1210                 waiter->read_target = omap_obj->sync->read_pending;
1211                 waiter->write_target = omap_obj->sync->write_pending;
1212                 waiter->notify = sync_notify;
1213                 waiter->arg = &waiter_task;
1214
1215                 spin_lock(&sync_lock);
1216                 if (is_waiting(waiter)) {
1217                         SYNC("waited: %p", waiter);
1218                         list_add_tail(&waiter->list, &waiters);
1219                         spin_unlock(&sync_lock);
1220                         ret = wait_event_interruptible(sync_event,
1221                                         (waiter_task == NULL));
1222                         spin_lock(&sync_lock);
1223                         if (waiter_task) {
1224                                 SYNC("interrupted: %p", waiter);
1225                                 /* we were interrupted */
1226                                 list_del(&waiter->list);
1227                                 waiter_task = NULL;
1228                         } else {
1229                                 /* freed in sync_op_update() */
1230                                 waiter = NULL;
1231                         }
1232                 }
1233                 spin_unlock(&sync_lock);
1234                 kfree(waiter);
1235         }
1236         return ret;
1237 }
1238
1239 /* call fxn(arg), either synchronously or asynchronously if the op
1240  * is currently blocked..  fxn() can be called from any context
1241  *
1242  * (TODO for now fxn is called back from whichever context calls
1243  * omap_gem_op_finish().. but this could be better defined later
1244  * if needed)
1245  *
1246  * TODO more code in common w/ _sync()..
1247  */
1248 int omap_gem_op_async(struct drm_gem_object *obj, enum omap_gem_op op,
1249                 void (*fxn)(void *arg), void *arg)
1250 {
1251         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1252         if (omap_obj->sync) {
1253                 struct omap_gem_sync_waiter *waiter =
1254                                 kzalloc(sizeof(*waiter), GFP_ATOMIC);
1255
1256                 if (!waiter)
1257                         return -ENOMEM;
1258
1259                 waiter->omap_obj = omap_obj;
1260                 waiter->op = op;
1261                 waiter->read_target = omap_obj->sync->read_pending;
1262                 waiter->write_target = omap_obj->sync->write_pending;
1263                 waiter->notify = fxn;
1264                 waiter->arg = arg;
1265
1266                 spin_lock(&sync_lock);
1267                 if (is_waiting(waiter)) {
1268                         SYNC("waited: %p", waiter);
1269                         list_add_tail(&waiter->list, &waiters);
1270                         spin_unlock(&sync_lock);
1271                         return 0;
1272                 }
1273
1274                 spin_unlock(&sync_lock);
1275
1276                 kfree(waiter);
1277         }
1278
1279         /* no waiting.. */
1280         fxn(arg);
1281
1282         return 0;
1283 }
1284
1285 /* -----------------------------------------------------------------------------
1286  * Constructor & Destructor
1287  */
1288
1289 void omap_gem_free_object(struct drm_gem_object *obj)
1290 {
1291         struct drm_device *dev = obj->dev;
1292         struct omap_drm_private *priv = dev->dev_private;
1293         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1294
1295         evict(obj);
1296
1297         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
1298
1299         spin_lock(&priv->list_lock);
1300         list_del(&omap_obj->mm_list);
1301         spin_unlock(&priv->list_lock);
1302
1303         /* this means the object is still pinned.. which really should
1304          * not happen.  I think..
1305          */
1306         WARN_ON(omap_obj->paddr_cnt > 0);
1307
1308         if (omap_obj->pages) {
1309                 if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
1310                         kfree(omap_obj->pages);
1311                 else
1312                         omap_gem_detach_pages(obj);
1313         }
1314
1315         if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
1316                 dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
1317                             omap_obj->paddr);
1318         } else if (omap_obj->vaddr) {
1319                 vunmap(omap_obj->vaddr);
1320         } else if (obj->import_attach) {
1321                 drm_prime_gem_destroy(obj, omap_obj->sgt);
1322         }
1323
1324         kfree(omap_obj->sync);
1325
1326         drm_gem_object_release(obj);
1327
1328         kfree(omap_obj);
1329 }
1330
1331 /* GEM buffer object constructor */
1332 struct drm_gem_object *omap_gem_new(struct drm_device *dev,
1333                 union omap_gem_size gsize, uint32_t flags)
1334 {
1335         struct omap_drm_private *priv = dev->dev_private;
1336         struct omap_gem_object *omap_obj;
1337         struct drm_gem_object *obj;
1338         struct address_space *mapping;
1339         size_t size;
1340         int ret;
1341
1342         /* Validate the flags and compute the memory and cache flags. */
1343         if (flags & OMAP_BO_TILED) {
1344                 if (!priv->usergart) {
1345                         dev_err(dev->dev, "Tiled buffers require DMM\n");
1346                         return NULL;
1347                 }
1348
1349                 /*
1350                  * Tiled buffers are always shmem paged backed. When they are
1351                  * scanned out, they are remapped into DMM/TILER.
1352                  */
1353                 flags &= ~OMAP_BO_SCANOUT;
1354                 flags |= OMAP_BO_MEM_SHMEM;
1355
1356                 /*
1357                  * Currently don't allow cached buffers. There is some caching
1358                  * stuff that needs to be handled better.
1359                  */
1360                 flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
1361                 flags |= tiler_get_cpu_cache_flags();
1362         } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
1363                 /*
1364                  * OMAP_BO_SCANOUT hints that the buffer doesn't need to be
1365                  * tiled. However, to lower the pressure on memory allocation,
1366                  * use contiguous memory only if no TILER is available.
1367                  */
1368                 flags |= OMAP_BO_MEM_DMA_API;
1369         } else if (!(flags & OMAP_BO_MEM_DMABUF)) {
1370                 /*
1371                  * All other buffers not backed by dma_buf are shmem-backed.
1372                  */
1373                 flags |= OMAP_BO_MEM_SHMEM;
1374         }
1375
1376         /* Allocate the initialize the OMAP GEM object. */
1377         omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
1378         if (!omap_obj)
1379                 return NULL;
1380
1381         obj = &omap_obj->base;
1382         omap_obj->flags = flags;
1383
1384         if (flags & OMAP_BO_TILED) {
1385                 /*
1386                  * For tiled buffers align dimensions to slot boundaries and
1387                  * calculate size based on aligned dimensions.
1388                  */
1389                 tiler_align(gem2fmt(flags), &gsize.tiled.width,
1390                             &gsize.tiled.height);
1391
1392                 size = tiler_size(gem2fmt(flags), gsize.tiled.width,
1393                                   gsize.tiled.height);
1394
1395                 omap_obj->width = gsize.tiled.width;
1396                 omap_obj->height = gsize.tiled.height;
1397         } else {
1398                 size = PAGE_ALIGN(gsize.bytes);
1399         }
1400
1401         /* Initialize the GEM object. */
1402         if (!(flags & OMAP_BO_MEM_SHMEM)) {
1403                 drm_gem_private_object_init(dev, obj, size);
1404         } else {
1405                 ret = drm_gem_object_init(dev, obj, size);
1406                 if (ret)
1407                         goto err_free;
1408
1409                 mapping = file_inode(obj->filp)->i_mapping;
1410                 mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
1411         }
1412
1413         /* Allocate memory if needed. */
1414         if (flags & OMAP_BO_MEM_DMA_API) {
1415                 omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
1416                                                &omap_obj->paddr,
1417                                                GFP_KERNEL);
1418                 if (!omap_obj->vaddr)
1419                         goto err_release;
1420         }
1421
1422         spin_lock(&priv->list_lock);
1423         list_add(&omap_obj->mm_list, &priv->obj_list);
1424         spin_unlock(&priv->list_lock);
1425
1426         return obj;
1427
1428 err_release:
1429         drm_gem_object_release(obj);
1430 err_free:
1431         kfree(omap_obj);
1432         return NULL;
1433 }
1434
1435 struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
1436                                            struct sg_table *sgt)
1437 {
1438         struct omap_drm_private *priv = dev->dev_private;
1439         struct omap_gem_object *omap_obj;
1440         struct drm_gem_object *obj;
1441         union omap_gem_size gsize;
1442
1443         /* Without a DMM only physically contiguous buffers can be supported. */
1444         if (sgt->orig_nents != 1 && !priv->has_dmm)
1445                 return ERR_PTR(-EINVAL);
1446
1447         mutex_lock(&dev->struct_mutex);
1448
1449         gsize.bytes = PAGE_ALIGN(size);
1450         obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
1451         if (!obj) {
1452                 obj = ERR_PTR(-ENOMEM);
1453                 goto done;
1454         }
1455
1456         omap_obj = to_omap_bo(obj);
1457         omap_obj->sgt = sgt;
1458
1459         if (sgt->orig_nents == 1) {
1460                 omap_obj->paddr = sg_dma_address(sgt->sgl);
1461         } else {
1462                 /* Create pages list from sgt */
1463                 struct sg_page_iter iter;
1464                 struct page **pages;
1465                 unsigned int npages;
1466                 unsigned int i = 0;
1467
1468                 npages = DIV_ROUND_UP(size, PAGE_SIZE);
1469                 pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
1470                 if (!pages) {
1471                         omap_gem_free_object(obj);
1472                         obj = ERR_PTR(-ENOMEM);
1473                         goto done;
1474                 }
1475
1476                 omap_obj->pages = pages;
1477
1478                 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
1479                         pages[i++] = sg_page_iter_page(&iter);
1480                         if (i > npages)
1481                                 break;
1482                 }
1483
1484                 if (WARN_ON(i != npages)) {
1485                         omap_gem_free_object(obj);
1486                         obj = ERR_PTR(-ENOMEM);
1487                         goto done;
1488                 }
1489         }
1490
1491 done:
1492         mutex_unlock(&dev->struct_mutex);
1493         return obj;
1494 }
1495
1496 /* convenience method to construct a GEM buffer object, and userspace handle */
1497 int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
1498                 union omap_gem_size gsize, uint32_t flags, uint32_t *handle)
1499 {
1500         struct drm_gem_object *obj;
1501         int ret;
1502
1503         obj = omap_gem_new(dev, gsize, flags);
1504         if (!obj)
1505                 return -ENOMEM;
1506
1507         ret = drm_gem_handle_create(file, obj, handle);
1508         if (ret) {
1509                 omap_gem_free_object(obj);
1510                 return ret;
1511         }
1512
1513         /* drop reference from allocate - handle holds it now */
1514         drm_gem_object_unreference_unlocked(obj);
1515
1516         return 0;
1517 }
1518
1519 /* -----------------------------------------------------------------------------
1520  * Init & Cleanup
1521  */
1522
1523 /* If DMM is used, we need to set some stuff up.. */
1524 void omap_gem_init(struct drm_device *dev)
1525 {
1526         struct omap_drm_private *priv = dev->dev_private;
1527         struct omap_drm_usergart *usergart;
1528         const enum tiler_fmt fmts[] = {
1529                         TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
1530         };
1531         int i, j;
1532
1533         if (!dmm_is_available()) {
1534                 /* DMM only supported on OMAP4 and later, so this isn't fatal */
1535                 dev_warn(dev->dev, "DMM not available, disable DMM support\n");
1536                 return;
1537         }
1538
1539         usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
1540         if (!usergart)
1541                 return;
1542
1543         /* reserve 4k aligned/wide regions for userspace mappings: */
1544         for (i = 0; i < ARRAY_SIZE(fmts); i++) {
1545                 uint16_t h = 1, w = PAGE_SIZE >> i;
1546                 tiler_align(fmts[i], &w, &h);
1547                 /* note: since each region is 1 4kb page wide, and minimum
1548                  * number of rows, the height ends up being the same as the
1549                  * # of pages in the region
1550                  */
1551                 usergart[i].height = h;
1552                 usergart[i].height_shift = ilog2(h);
1553                 usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
1554                 usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
1555                 for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
1556                         struct omap_drm_usergart_entry *entry;
1557                         struct tiler_block *block;
1558
1559                         entry = &usergart[i].entry[j];
1560                         block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
1561                         if (IS_ERR(block)) {
1562                                 dev_err(dev->dev,
1563                                                 "reserve failed: %d, %d, %ld\n",
1564                                                 i, j, PTR_ERR(block));
1565                                 return;
1566                         }
1567                         entry->paddr = tiler_ssptr(block);
1568                         entry->block = block;
1569
1570                         DBG("%d:%d: %dx%d: paddr=%pad stride=%d", i, j, w, h,
1571                                         &entry->paddr,
1572                                         usergart[i].stride_pfn << PAGE_SHIFT);
1573                 }
1574         }
1575
1576         priv->usergart = usergart;
1577         priv->has_dmm = true;
1578 }
1579
1580 void omap_gem_deinit(struct drm_device *dev)
1581 {
1582         struct omap_drm_private *priv = dev->dev_private;
1583
1584         /* I believe we can rely on there being no more outstanding GEM
1585          * objects which could depend on usergart/dmm at this point.
1586          */
1587         kfree(priv->usergart);
1588 }