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 <rob.clark@linaro.org>
   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/seq_file.h>
  21 #include <linux/shmem_fs.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/pfn_t.h>
  24
  25 #include <drm/drm_vma_manager.h>
  26
  27 #include "omap_drv.h"
  28 #include "omap_dmm_tiler.h"
  29
  30 /*
  31  * GEM buffer object implementation.
  32  */
  33
  34 /* note: we use upper 8 bits of flags for driver-internal flags: */
  35 #define OMAP_BO_MEM_DMA_API     0x01000000      /* memory allocated with the dma_alloc_* API */
  36 #define OMAP_BO_MEM_SHMEM       0x02000000      /* memory allocated through shmem backing */
  37 #define OMAP_BO_MEM_DMABUF      0x08000000      /* memory imported from a dmabuf */
  38
  39 struct omap_gem_object {
  40         struct drm_gem_object base;
  41
  42         struct list_head mm_list;
  43
  44         uint32_t flags;
  45
  46         /** width/height for tiled formats (rounded up to slot boundaries) */
  47         uint16_t width, height;
  48
  49         /** roll applied when mapping to DMM */
  50         uint32_t roll;
  51
  52         /**
  53          * paddr contains the buffer DMA address. It is valid for
  54          *
  55          * - buffers allocated through the DMA mapping API (with the
  56          *   OMAP_BO_MEM_DMA_API flag set)
  57          *
  58          * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
  59          *   if they are physically contiguous (when sgt->orig_nents == 1)
  60          *
  61          * - buffers mapped through the TILER when paddr_cnt is not zero, in
  62          *   which case the DMA address points to the TILER aperture
  63          *
  64          * Physically contiguous buffers have their DMA address equal to the
  65          * physical address as we don't remap those buffers through the TILER.
  66          *
  67          * Buffers mapped to the TILER have their DMA address pointing to the
  68          * TILER aperture. As TILER mappings are refcounted (through paddr_cnt)
  69          * the DMA address must be accessed through omap_get_get_paddr() to
  70          * ensure that the mapping won't disappear unexpectedly. References must
  71          * be released with omap_gem_put_paddr().
  72          */
  73         dma_addr_t paddr;
  74
  75         /**
  76          * # of users of paddr
  77          */
  78         uint32_t paddr_cnt;
  79
  80         /**
  81          * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
  82          * is set and the sgt field is valid.
  83          */
  84         struct sg_table *sgt;
  85
  86         /**
  87          * tiler block used when buffer is remapped in DMM/TILER.
  88          */
  89         struct tiler_block *block;
  90
  91         /**
  92          * Array of backing pages, if allocated.  Note that pages are never
  93          * allocated for buffers originally allocated from contiguous memory
  94          */
  95         struct page **pages;
  96
  97         /** addresses corresponding to pages in above array */
  98         dma_addr_t *addrs;
  99
 100         /**
 101          * Virtual address, if mapped.
 102          */
 103         void *vaddr;
 104
 105         /**
 106          * sync-object allocated on demand (if needed)
 107          *
 108          * Per-buffer sync-object for tracking pending and completed hw/dma
 109          * read and write operations.
 110          */
 111         struct {
 112                 uint32_t write_pending;
 113                 uint32_t write_complete;
 114                 uint32_t read_pending;
 115                 uint32_t read_complete;
 116         } *sync;
 117 };
 118
 119 #define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
 120
 121 /* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
 122  * not necessarily pinned in TILER all the time, and (b) when they are
 123  * they are not necessarily page aligned, we reserve one or more small
 124  * regions in each of the 2d containers to use as a user-GART where we
 125  * can create a second page-aligned mapping of parts of the buffer
 126  * being accessed from userspace.
 127  *
 128  * Note that we could optimize slightly when we know that multiple
 129  * tiler containers are backed by the same PAT.. but I'll leave that
 130  * for later..
 131  */
 132 #define NUM_USERGART_ENTRIES 2
 133 struct omap_drm_usergart_entry {
 134         struct tiler_block *block;      /* the reserved tiler block */
 135         dma_addr_t paddr;
 136         struct drm_gem_object *obj;     /* the current pinned obj */
 137         pgoff_t obj_pgoff;              /* page offset of obj currently
 138                                            mapped in */
 139 };
 140
 141 struct omap_drm_usergart {
 142         struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
 143         int height;                             /* height in rows */
 144         int height_shift;               /* ilog2(height in rows) */
 145         int slot_shift;                 /* ilog2(width per slot) */
 146         int stride_pfn;                 /* stride in pages */
 147         int last;                               /* index of last used entry */
 148 };
 149
 150 /* -----------------------------------------------------------------------------
 151  * Helpers
 152  */
 153
 154 /** get mmap offset */
 155 static uint64_t mmap_offset(struct drm_gem_object *obj)
 156 {
 157         struct drm_device *dev = obj->dev;
 158         int ret;
 159         size_t size;
 160
 161         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 162
 163         /* Make it mmapable */
 164         size = omap_gem_mmap_size(obj);
 165         ret = drm_gem_create_mmap_offset_size(obj, size);
 166         if (ret) {
 167                 dev_err(dev->dev, "could not allocate mmap offset\n");
 168                 return 0;
 169         }
 170
 171         return drm_vma_node_offset_addr(&obj->vma_node);
 172 }
 173
 174 static bool is_contiguous(struct omap_gem_object *omap_obj)
 175 {
 176         if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
 177                 return true;
 178
 179         if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
 180                 return true;
 181
 182         return false;
 183 }
 184
 185 /* -----------------------------------------------------------------------------
 186  * Eviction
 187  */
 188
 189 static void evict_entry(struct drm_gem_object *obj,
 190                 enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
 191 {
 192         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 193         struct omap_drm_private *priv = obj->dev->dev_private;
 194         int n = priv->usergart[fmt].height;
 195         size_t size = PAGE_SIZE * n;
 196         loff_t off = mmap_offset(obj) +
 197                         (entry->obj_pgoff << PAGE_SHIFT);
 198         const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
 199
 200         if (m > 1) {
 201                 int i;
 202                 /* if stride > than PAGE_SIZE then sparse mapping: */
 203                 for (i = n; i > 0; i--) {
 204                         unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 205                                             off, PAGE_SIZE, 1);
 206                         off += PAGE_SIZE * m;
 207                 }
 208         } else {
 209                 unmap_mapping_range(obj->dev->anon_inode->i_mapping,
 210                                     off, size, 1);
 211         }
 212
 213         entry->obj = NULL;
 214 }
 215
 216 /* Evict a buffer from usergart, if it is mapped there */
 217 static void evict(struct drm_gem_object *obj)
 218 {
 219         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 220         struct omap_drm_private *priv = obj->dev->dev_private;
 221
 222         if (omap_obj->flags & OMAP_BO_TILED) {
 223                 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 224                 int i;
 225
 226                 for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
 227                         struct omap_drm_usergart_entry *entry =
 228                                 &priv->usergart[fmt].entry[i];
 229
 230                         if (entry->obj == obj)
 231                                 evict_entry(obj, fmt, entry);
 232                 }
 233         }
 234 }
 235
 236 /* -----------------------------------------------------------------------------
 237  * Page Management
 238  */
 239
 240 /** ensure backing pages are allocated */
 241 static int omap_gem_attach_pages(struct drm_gem_object *obj)
 242 {
 243         struct drm_device *dev = obj->dev;
 244         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 245         struct page **pages;
 246         int npages = obj->size >> PAGE_SHIFT;
 247         int i, ret;
 248         dma_addr_t *addrs;
 249
 250         WARN_ON(omap_obj->pages);
 251
 252         pages = drm_gem_get_pages(obj);
 253         if (IS_ERR(pages)) {
 254                 dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
 255                 return PTR_ERR(pages);
 256         }
 257
 258         /* for non-cached buffers, ensure the new pages are clean because
 259          * DSS, GPU, etc. are not cache coherent:
 260          */
 261         if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 262                 addrs = kmalloc(npages * sizeof(*addrs), GFP_KERNEL);
 263                 if (!addrs) {
 264                         ret = -ENOMEM;
 265                         goto free_pages;
 266                 }
 267
 268                 for (i = 0; i < npages; i++) {
 269                         addrs[i] = dma_map_page(dev->dev, pages[i],
 270                                         0, PAGE_SIZE, DMA_BIDIRECTIONAL);
 271
 272                         if (dma_mapping_error(dev->dev, addrs[i])) {
 273                                 dev_warn(dev->dev,
 274                                         "%s: failed to map page\n", __func__);
 275
 276                                 for (i = i - 1; i >= 0; --i) {
 277                                         dma_unmap_page(dev->dev, addrs[i],
 278                                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
 279                                 }
 280
 281                                 ret = -ENOMEM;
 282                                 goto free_addrs;
 283                         }
 284                 }
 285         } else {
 286                 addrs = kzalloc(npages * sizeof(*addrs), GFP_KERNEL);
 287                 if (!addrs) {
 288                         ret = -ENOMEM;
 289                         goto free_pages;
 290                 }
 291         }
 292
 293         omap_obj->addrs = addrs;
 294         omap_obj->pages = pages;
 295
 296         return 0;
 297
 298 free_addrs:
 299         kfree(addrs);
 300 free_pages:
 301         drm_gem_put_pages(obj, pages, true, false);
 302
 303         return ret;
 304 }
 305
 306 /* acquire pages when needed (for example, for DMA where physically
 307  * contiguous buffer is not required
 308  */
 309 static int get_pages(struct drm_gem_object *obj, struct page ***pages)
 310 {
 311         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 312         int ret = 0;
 313
 314         if ((omap_obj->flags & OMAP_BO_MEM_SHMEM) && !omap_obj->pages) {
 315                 ret = omap_gem_attach_pages(obj);
 316                 if (ret) {
 317                         dev_err(obj->dev->dev, "could not attach pages\n");
 318                         return ret;
 319                 }
 320         }
 321
 322         /* TODO: even phys-contig.. we should have a list of pages? */
 323         *pages = omap_obj->pages;
 324
 325         return 0;
 326 }
 327
 328 /** release backing pages */
 329 static void omap_gem_detach_pages(struct drm_gem_object *obj)
 330 {
 331         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 332
 333         /* for non-cached buffers, ensure the new pages are clean because
 334          * DSS, GPU, etc. are not cache coherent:
 335          */
 336         if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
 337                 int i, npages = obj->size >> PAGE_SHIFT;
 338                 for (i = 0; i < npages; i++) {
 339                         dma_unmap_page(obj->dev->dev, omap_obj->addrs[i],
 340                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
 341                 }
 342         }
 343
 344         kfree(omap_obj->addrs);
 345         omap_obj->addrs = NULL;
 346
 347         drm_gem_put_pages(obj, omap_obj->pages, true, false);
 348         omap_obj->pages = NULL;
 349 }
 350
 351 /* get buffer flags */
 352 uint32_t omap_gem_flags(struct drm_gem_object *obj)
 353 {
 354         return to_omap_bo(obj)->flags;
 355 }
 356
 357 uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj)
 358 {
 359         uint64_t offset;
 360         mutex_lock(&obj->dev->struct_mutex);
 361         offset = mmap_offset(obj);
 362         mutex_unlock(&obj->dev->struct_mutex);
 363         return offset;
 364 }
 365
 366 /** get mmap size */
 367 size_t omap_gem_mmap_size(struct drm_gem_object *obj)
 368 {
 369         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 370         size_t size = obj->size;
 371
 372         if (omap_obj->flags & OMAP_BO_TILED) {
 373                 /* for tiled buffers, the virtual size has stride rounded up
 374                  * to 4kb.. (to hide the fact that row n+1 might start 16kb or
 375                  * 32kb later!).  But we don't back the entire buffer with
 376                  * pages, only the valid picture part.. so need to adjust for
 377                  * this in the size used to mmap and generate mmap offset
 378                  */
 379                 size = tiler_vsize(gem2fmt(omap_obj->flags),
 380                                 omap_obj->width, omap_obj->height);
 381         }
 382
 383         return size;
 384 }
 385
 386 /* get tiled size, returns -EINVAL if not tiled buffer */
 387 int omap_gem_tiled_size(struct drm_gem_object *obj, uint16_t *w, uint16_t *h)
 388 {
 389         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 390         if (omap_obj->flags & OMAP_BO_TILED) {
 391                 *w = omap_obj->width;
 392                 *h = omap_obj->height;
 393                 return 0;
 394         }
 395         return -EINVAL;
 396 }
 397
 398 /* -----------------------------------------------------------------------------
 399  * Fault Handling
 400  */
 401
 402 /* Normal handling for the case of faulting in non-tiled buffers */
 403 static int fault_1d(struct drm_gem_object *obj,
 404                 struct vm_area_struct *vma, struct vm_fault *vmf)
 405 {
 406         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 407         unsigned long pfn;
 408         pgoff_t pgoff;
 409
 410         /* We don't use vmf->pgoff since that has the fake offset: */
 411         pgoff = ((unsigned long)vmf->virtual_address -
 412                         vma->vm_start) >> PAGE_SHIFT;
 413
 414         if (omap_obj->pages) {
 415                 omap_gem_cpu_sync(obj, pgoff);
 416                 pfn = page_to_pfn(omap_obj->pages[pgoff]);
 417         } else {
 418                 BUG_ON(!is_contiguous(omap_obj));
 419                 pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff;
 420         }
 421
 422         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 423                         pfn, pfn << PAGE_SHIFT);
 424
 425         return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
 426                         __pfn_to_pfn_t(pfn, PFN_DEV));
 427 }
 428
 429 /* Special handling for the case of faulting in 2d tiled buffers */
 430 static int fault_2d(struct drm_gem_object *obj,
 431                 struct vm_area_struct *vma, struct vm_fault *vmf)
 432 {
 433         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 434         struct omap_drm_private *priv = obj->dev->dev_private;
 435         struct omap_drm_usergart_entry *entry;
 436         enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 437         struct page *pages[64];  /* XXX is this too much to have on stack? */
 438         unsigned long pfn;
 439         pgoff_t pgoff, base_pgoff;
 440         void __user *vaddr;
 441         int i, ret, slots;
 442
 443         /*
 444          * Note the height of the slot is also equal to the number of pages
 445          * that need to be mapped in to fill 4kb wide CPU page.  If the slot
 446          * height is 64, then 64 pages fill a 4kb wide by 64 row region.
 447          */
 448         const int n = priv->usergart[fmt].height;
 449         const int n_shift = priv->usergart[fmt].height_shift;
 450
 451         /*
 452          * If buffer width in bytes > PAGE_SIZE then the virtual stride is
 453          * rounded up to next multiple of PAGE_SIZE.. this need to be taken
 454          * into account in some of the math, so figure out virtual stride
 455          * in pages
 456          */
 457         const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
 458
 459         /* We don't use vmf->pgoff since that has the fake offset: */
 460         pgoff = ((unsigned long)vmf->virtual_address -
 461                         vma->vm_start) >> PAGE_SHIFT;
 462
 463         /*
 464          * Actual address we start mapping at is rounded down to previous slot
 465          * boundary in the y direction:
 466          */
 467         base_pgoff = round_down(pgoff, m << n_shift);
 468
 469         /* figure out buffer width in slots */
 470         slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
 471
 472         vaddr = vmf->virtual_address - ((pgoff - base_pgoff) << PAGE_SHIFT);
 473
 474         entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
 475
 476         /* evict previous buffer using this usergart entry, if any: */
 477         if (entry->obj)
 478                 evict_entry(entry->obj, fmt, entry);
 479
 480         entry->obj = obj;
 481         entry->obj_pgoff = base_pgoff;
 482
 483         /* now convert base_pgoff to phys offset from virt offset: */
 484         base_pgoff = (base_pgoff >> n_shift) * slots;
 485
 486         /* for wider-than 4k.. figure out which part of the slot-row we want: */
 487         if (m > 1) {
 488                 int off = pgoff % m;
 489                 entry->obj_pgoff += off;
 490                 base_pgoff /= m;
 491                 slots = min(slots - (off << n_shift), n);
 492                 base_pgoff += off << n_shift;
 493                 vaddr += off << PAGE_SHIFT;
 494         }
 495
 496         /*
 497          * Map in pages. Beyond the valid pixel part of the buffer, we set
 498          * pages[i] to NULL to get a dummy page mapped in.. if someone
 499          * reads/writes it they will get random/undefined content, but at
 500          * least it won't be corrupting whatever other random page used to
 501          * be mapped in, or other undefined behavior.
 502          */
 503         memcpy(pages, &omap_obj->pages[base_pgoff],
 504                         sizeof(struct page *) * slots);
 505         memset(pages + slots, 0,
 506                         sizeof(struct page *) * (n - slots));
 507
 508         ret = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
 509         if (ret) {
 510                 dev_err(obj->dev->dev, "failed to pin: %d\n", ret);
 511                 return ret;
 512         }
 513
 514         pfn = entry->paddr >> PAGE_SHIFT;
 515
 516         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 517                         pfn, pfn << PAGE_SHIFT);
 518
 519         for (i = n; i > 0; i--) {
 520                 vm_insert_mixed(vma, (unsigned long)vaddr,
 521                                 __pfn_to_pfn_t(pfn, PFN_DEV));
 522                 pfn += priv->usergart[fmt].stride_pfn;
 523                 vaddr += PAGE_SIZE * m;
 524         }
 525
 526         /* simple round-robin: */
 527         priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
 528                                  % NUM_USERGART_ENTRIES;
 529
 530         return 0;
 531 }
 532
 533 /**
 534  * omap_gem_fault               -       pagefault handler for GEM objects
 535  * @vma: the VMA of the GEM object
 536  * @vmf: fault detail
 537  *
 538  * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
 539  * does most of the work for us including the actual map/unmap calls
 540  * but we need to do the actual page work.
 541  *
 542  * The VMA was set up by GEM. In doing so it also ensured that the
 543  * vma->vm_private_data points to the GEM object that is backing this
 544  * mapping.
 545  */
 546 int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 547 {
 548         struct drm_gem_object *obj = vma->vm_private_data;
 549         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 550         struct drm_device *dev = obj->dev;
 551         struct page **pages;
 552         int ret;
 553
 554         /* Make sure we don't parallel update on a fault, nor move or remove
 555          * something from beneath our feet
 556          */
 557         mutex_lock(&dev->struct_mutex);
 558
 559         /* if a shmem backed object, make sure we have pages attached now */
 560         ret = get_pages(obj, &pages);
 561         if (ret)
 562                 goto fail;
 563
 564         /* where should we do corresponding put_pages().. we are mapping
 565          * the original page, rather than thru a GART, so we can't rely
 566          * on eviction to trigger this.  But munmap() or all mappings should
 567          * probably trigger put_pages()?
 568          */
 569
 570         if (omap_obj->flags & OMAP_BO_TILED)
 571                 ret = fault_2d(obj, vma, vmf);
 572         else
 573                 ret = fault_1d(obj, vma, vmf);
 574
 575
 576 fail:
 577         mutex_unlock(&dev->struct_mutex);
 578         switch (ret) {
 579         case 0:
 580         case -ERESTARTSYS:
 581         case -EINTR:
 582         case -EBUSY:
 583                 /*
 584                  * EBUSY is ok: this just means that another thread
 585                  * already did the job.
 586                  */
 587                 return VM_FAULT_NOPAGE;
 588         case -ENOMEM:
 589                 return VM_FAULT_OOM;
 590         default:
 591                 return VM_FAULT_SIGBUS;
 592         }
 593 }
 594
 595 /** We override mainly to fix up some of the vm mapping flags.. */
 596 int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 597 {
 598         int ret;
 599
 600         ret = drm_gem_mmap(filp, vma);
 601         if (ret) {
 602                 DBG("mmap failed: %d", ret);
 603                 return ret;
 604         }
 605
 606         return omap_gem_mmap_obj(vma->vm_private_data, vma);
 607 }
 608
 609 int omap_gem_mmap_obj(struct drm_gem_object *obj,
 610                 struct vm_area_struct *vma)
 611 {
 612         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 613
 614         vma->vm_flags &= ~VM_PFNMAP;
 615         vma->vm_flags |= VM_MIXEDMAP;
 616
 617         if (omap_obj->flags & OMAP_BO_WC) {
 618                 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 619         } else if (omap_obj->flags & OMAP_BO_UNCACHED) {
 620                 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 621         } else {
 622                 /*
 623                  * We do have some private objects, at least for scanout buffers
 624                  * on hardware without DMM/TILER.  But these are allocated write-
 625                  * combine
 626                  */
 627                 if (WARN_ON(!obj->filp))
 628                         return -EINVAL;
 629
 630                 /*
 631                  * Shunt off cached objs to shmem file so they have their own
 632                  * address_space (so unmap_mapping_range does what we want,
 633                  * in particular in the case of mmap'd dmabufs)
 634                  */
 635                 fput(vma->vm_file);
 636                 vma->vm_pgoff = 0;
 637                 vma->vm_file  = get_file(obj->filp);
 638
 639                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 640         }
 641
 642         return 0;
 643 }
 644
 645 /* -----------------------------------------------------------------------------
 646  * Dumb Buffers
 647  */
 648
 649 /**
 650  * omap_gem_dumb_create -       create a dumb buffer
 651  * @drm_file: our client file
 652  * @dev: our device
 653  * @args: the requested arguments copied from userspace
 654  *
 655  * Allocate a buffer suitable for use for a frame buffer of the
 656  * form described by user space. Give userspace a handle by which
 657  * to reference it.
 658  */
 659 int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
 660                 struct drm_mode_create_dumb *args)
 661 {
 662         union omap_gem_size gsize;
 663
 664         args->pitch = align_pitch(0, args->width, args->bpp);
 665         args->size = PAGE_ALIGN(args->pitch * args->height);
 666
 667         gsize = (union omap_gem_size){
 668                 .bytes = args->size,
 669         };
 670
 671         return omap_gem_new_handle(dev, file, gsize,
 672                         OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
 673 }
 674
 675 /**
 676  * omap_gem_dumb_map    -       buffer mapping for dumb interface
 677  * @file: our drm client file
 678  * @dev: drm device
 679  * @handle: GEM handle to the object (from dumb_create)
 680  *
 681  * Do the necessary setup to allow the mapping of the frame buffer
 682  * into user memory. We don't have to do much here at the moment.
 683  */
 684 int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 685                 uint32_t handle, uint64_t *offset)
 686 {
 687         struct drm_gem_object *obj;
 688         int ret = 0;
 689
 690         /* GEM does all our handle to object mapping */
 691         obj = drm_gem_object_lookup(file, handle);
 692         if (obj == NULL) {
 693                 ret = -ENOENT;
 694                 goto fail;
 695         }
 696
 697         *offset = omap_gem_mmap_offset(obj);
 698
 699         drm_gem_object_unreference_unlocked(obj);
 700
 701 fail:
 702         return ret;
 703 }
 704
 705 #ifdef CONFIG_DRM_FBDEV_EMULATION
 706 /* Set scrolling position.  This allows us to implement fast scrolling
 707  * for console.
 708  *
 709  * Call only from non-atomic contexts.
 710  */
 711 int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll)
 712 {
 713         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 714         uint32_t npages = obj->size >> PAGE_SHIFT;
 715         int ret = 0;
 716
 717         if (roll > npages) {
 718                 dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
 719                 return -EINVAL;
 720         }
 721
 722         omap_obj->roll = roll;
 723
 724         mutex_lock(&obj->dev->struct_mutex);
 725
 726         /* if we aren't mapped yet, we don't need to do anything */
 727         if (omap_obj->block) {
 728                 struct page **pages;
 729                 ret = get_pages(obj, &pages);
 730                 if (ret)
 731                         goto fail;
 732                 ret = tiler_pin(omap_obj->block, pages, npages, roll, true);
 733                 if (ret)
 734                         dev_err(obj->dev->dev, "could not repin: %d\n", ret);
 735         }
 736
 737 fail:
 738         mutex_unlock(&obj->dev->struct_mutex);
 739
 740         return ret;
 741 }
 742 #endif
 743
 744 /* -----------------------------------------------------------------------------
 745  * Memory Management & DMA Sync
 746  */
 747
 748 /**
 749  * shmem buffers that are mapped cached can simulate coherency via using
 750  * page faulting to keep track of dirty pages
 751  */
 752 static inline bool is_cached_coherent(struct drm_gem_object *obj)
 753 {
 754         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 755
 756         return (omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
 757                 ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED);
 758 }
 759
 760 /* Sync the buffer for CPU access.. note pages should already be
 761  * attached, ie. omap_gem_get_pages()
 762  */
 763 void omap_gem_cpu_sync(struct drm_gem_object *obj, int pgoff)
 764 {
 765         struct drm_device *dev = obj->dev;
 766         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 767
 768         if (is_cached_coherent(obj) && omap_obj->addrs[pgoff]) {
 769                 dma_unmap_page(dev->dev, omap_obj->addrs[pgoff],
 770                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
 771                 omap_obj->addrs[pgoff] = 0;
 772         }
 773 }
 774
 775 /* sync the buffer for DMA access */
 776 void omap_gem_dma_sync(struct drm_gem_object *obj,
 777                 enum dma_data_direction dir)
 778 {
 779         struct drm_device *dev = obj->dev;
 780         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 781
 782         if (is_cached_coherent(obj)) {
 783                 int i, npages = obj->size >> PAGE_SHIFT;
 784                 struct page **pages = omap_obj->pages;
 785                 bool dirty = false;
 786
 787                 for (i = 0; i < npages; i++) {
 788                         if (!omap_obj->addrs[i]) {
 789                                 dma_addr_t addr;
 790
 791                                 addr = dma_map_page(dev->dev, pages[i], 0,
 792                                                 PAGE_SIZE, DMA_BIDIRECTIONAL);
 793
 794                                 if (dma_mapping_error(dev->dev, addr)) {
 795                                         dev_warn(dev->dev,
 796                                                 "%s: failed to map page\n",
 797                                                 __func__);
 798                                         break;
 799                                 }
 800
 801                                 dirty = true;
 802                                 omap_obj->addrs[i] = addr;
 803                         }
 804                 }
 805
 806                 if (dirty) {
 807                         unmap_mapping_range(obj->filp->f_mapping, 0,
 808                                         omap_gem_mmap_size(obj), 1);
 809                 }
 810         }
 811 }
 812
 813 /* Get physical address for DMA.. if 'remap' is true, and the buffer is not
 814  * already contiguous, remap it to pin in physically contiguous memory.. (ie.
 815  * map in TILER)
 816  */
 817 int omap_gem_get_paddr(struct drm_gem_object *obj,
 818                 dma_addr_t *paddr, bool remap)
 819 {
 820         struct omap_drm_private *priv = obj->dev->dev_private;
 821         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 822         int ret = 0;
 823
 824         mutex_lock(&obj->dev->struct_mutex);
 825
 826         if (!is_contiguous(omap_obj) && remap && priv->has_dmm) {
 827                 if (omap_obj->paddr_cnt == 0) {
 828                         struct page **pages;
 829                         uint32_t npages = obj->size >> PAGE_SHIFT;
 830                         enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 831                         struct tiler_block *block;
 832
 833                         BUG_ON(omap_obj->block);
 834
 835                         ret = get_pages(obj, &pages);
 836                         if (ret)
 837                                 goto fail;
 838
 839                         if (omap_obj->flags & OMAP_BO_TILED) {
 840                                 block = tiler_reserve_2d(fmt,
 841                                                 omap_obj->width,
 842                                                 omap_obj->height, 0);
 843                         } else {
 844                                 block = tiler_reserve_1d(obj->size);
 845                         }
 846
 847                         if (IS_ERR(block)) {
 848                                 ret = PTR_ERR(block);
 849                                 dev_err(obj->dev->dev,
 850                                         "could not remap: %d (%d)\n", ret, fmt);
 851                                 goto fail;
 852                         }
 853
 854                         /* TODO: enable async refill.. */
 855                         ret = tiler_pin(block, pages, npages,
 856                                         omap_obj->roll, true);
 857                         if (ret) {
 858                                 tiler_release(block);
 859                                 dev_err(obj->dev->dev,
 860                                                 "could not pin: %d\n", ret);
 861                                 goto fail;
 862                         }
 863
 864                         omap_obj->paddr = tiler_ssptr(block);
 865                         omap_obj->block = block;
 866
 867                         DBG("got paddr: %pad", &omap_obj->paddr);
 868                 }
 869
 870                 omap_obj->paddr_cnt++;
 871
 872                 *paddr = omap_obj->paddr;
 873         } else if (is_contiguous(omap_obj)) {
 874                 *paddr = omap_obj->paddr;
 875         } else {
 876                 ret = -EINVAL;
 877                 goto fail;
 878         }
 879
 880 fail:
 881         mutex_unlock(&obj->dev->struct_mutex);
 882
 883         return ret;
 884 }
 885
 886 /* Release physical address, when DMA is no longer being performed.. this
 887  * could potentially unpin and unmap buffers from TILER
 888  */
 889 void omap_gem_put_paddr(struct drm_gem_object *obj)
 890 {
 891         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 892         int ret;
 893
 894         mutex_lock(&obj->dev->struct_mutex);
 895         if (omap_obj->paddr_cnt > 0) {
 896                 omap_obj->paddr_cnt--;
 897                 if (omap_obj->paddr_cnt == 0) {
 898                         ret = tiler_unpin(omap_obj->block);
 899                         if (ret) {
 900                                 dev_err(obj->dev->dev,
 901                                         "could not unpin pages: %d\n", ret);
 902                         }
 903                         ret = tiler_release(omap_obj->block);
 904                         if (ret) {
 905                                 dev_err(obj->dev->dev,
 906                                         "could not release unmap: %d\n", ret);
 907                         }
 908                         omap_obj->paddr = 0;
 909                         omap_obj->block = NULL;
 910                 }
 911         }
 912
 913         mutex_unlock(&obj->dev->struct_mutex);
 914 }
 915
 916 /* Get rotated scanout address (only valid if already pinned), at the
 917  * specified orientation and x,y offset from top-left corner of buffer
 918  * (only valid for tiled 2d buffers)
 919  */
 920 int omap_gem_rotated_paddr(struct drm_gem_object *obj, uint32_t orient,
 921                 int x, int y, dma_addr_t *paddr)
 922 {
 923         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 924         int ret = -EINVAL;
 925
 926         mutex_lock(&obj->dev->struct_mutex);
 927         if ((omap_obj->paddr_cnt > 0) && omap_obj->block &&
 928                         (omap_obj->flags & OMAP_BO_TILED)) {
 929                 *paddr = tiler_tsptr(omap_obj->block, orient, x, y);
 930                 ret = 0;
 931         }
 932         mutex_unlock(&obj->dev->struct_mutex);
 933         return ret;
 934 }
 935
 936 /* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
 937 int omap_gem_tiled_stride(struct drm_gem_object *obj, uint32_t orient)
 938 {
 939         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 940         int ret = -EINVAL;
 941         if (omap_obj->flags & OMAP_BO_TILED)
 942                 ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
 943         return ret;
 944 }
 945
 946 /* if !remap, and we don't have pages backing, then fail, rather than
 947  * increasing the pin count (which we don't really do yet anyways,
 948  * because we don't support swapping pages back out).  And 'remap'
 949  * might not be quite the right name, but I wanted to keep it working
 950  * similarly to omap_gem_get_paddr().  Note though that mutex is not
 951  * aquired if !remap (because this can be called in atomic ctxt),
 952  * but probably omap_gem_get_paddr() should be changed to work in the
 953  * same way.  If !remap, a matching omap_gem_put_pages() call is not
 954  * required (and should not be made).
 955  */
 956 int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
 957                 bool remap)
 958 {
 959         int ret;
 960         if (!remap) {
 961                 struct omap_gem_object *omap_obj = to_omap_bo(obj);
 962                 if (!omap_obj->pages)
 963                         return -ENOMEM;
 964                 *pages = omap_obj->pages;
 965                 return 0;
 966         }
 967         mutex_lock(&obj->dev->struct_mutex);
 968         ret = get_pages(obj, pages);
 969         mutex_unlock(&obj->dev->struct_mutex);
 970         return ret;
 971 }
 972
 973 /* release pages when DMA no longer being performed */
 974 int omap_gem_put_pages(struct drm_gem_object *obj)
 975 {
 976         /* do something here if we dynamically attach/detach pages.. at
 977          * least they would no longer need to be pinned if everyone has
 978          * released the pages..
 979          */
 980         return 0;
 981 }
 982
 983 #ifdef CONFIG_DRM_FBDEV_EMULATION
 984 /* Get kernel virtual address for CPU access.. this more or less only
 985  * exists for omap_fbdev.  This should be called with struct_mutex
 986  * held.
 987  */
 988 void *omap_gem_vaddr(struct drm_gem_object *obj)
 989 {
 990         struct omap_gem_object *omap_obj = to_omap_bo(obj);
 991         WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
 992         if (!omap_obj->vaddr) {
 993                 struct page **pages;
 994                 int ret = get_pages(obj, &pages);
 995                 if (ret)
 996                         return ERR_PTR(ret);
 997                 omap_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 998                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 999         }
1000         return omap_obj->vaddr;
1001 }
1002 #endif
1003
1004 /* -----------------------------------------------------------------------------
1005  * Power Management
1006  */
1007
1008 #ifdef CONFIG_PM
1009 /* re-pin objects in DMM in resume path: */
1010 int omap_gem_resume(struct device *dev)
1011 {
1012         struct drm_device *drm_dev = dev_get_drvdata(dev);
1013         struct omap_drm_private *priv = drm_dev->dev_private;
1014         struct omap_gem_object *omap_obj;
1015         int ret = 0;
1016
1017         list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
1018                 if (omap_obj->block) {
1019                         struct drm_gem_object *obj = &omap_obj->base;
1020                         uint32_t npages = obj->size >> PAGE_SHIFT;
1021                         WARN_ON(!omap_obj->pages);  /* this can't happen */
1022                         ret = tiler_pin(omap_obj->block,
1023                                         omap_obj->pages, npages,
1024                                         omap_obj->roll, true);
1025                         if (ret) {
1026                                 dev_err(dev, "could not repin: %d\n", ret);
1027                                 return ret;
1028                         }
1029                 }
1030         }
1031
1032         return 0;
1033 }
1034 #endif
1035
1036 /* -----------------------------------------------------------------------------
1037  * DebugFS
1038  */
1039
1040 #ifdef CONFIG_DEBUG_FS
1041 void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
1042 {
1043         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1044         uint64_t off;
1045
1046         off = drm_vma_node_start(&obj->vma_node);
1047
1048         seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
1049                         omap_obj->flags, obj->name, obj->refcount.refcount.counter,
1050                         off, &omap_obj->paddr, omap_obj->paddr_cnt,
1051                         omap_obj->vaddr, omap_obj->roll);
1052
1053         if (omap_obj->flags & OMAP_BO_TILED) {
1054                 seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
1055                 if (omap_obj->block) {
1056                         struct tcm_area *area = &omap_obj->block->area;
1057                         seq_printf(m, " (%dx%d, %dx%d)",
1058                                         area->p0.x, area->p0.y,
1059                                         area->p1.x, area->p1.y);
1060                 }
1061         } else {
1062                 seq_printf(m, " %d", obj->size);
1063         }
1064
1065         seq_printf(m, "\n");
1066 }
1067
1068 void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
1069 {
1070         struct omap_gem_object *omap_obj;
1071         int count = 0;
1072         size_t size = 0;
1073
1074         list_for_each_entry(omap_obj, list, mm_list) {
1075                 struct drm_gem_object *obj = &omap_obj->base;
1076                 seq_printf(m, "   ");
1077                 omap_gem_describe(obj, m);
1078                 count++;
1079                 size += obj->size;
1080         }
1081
1082         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
1083 }
1084 #endif
1085
1086 /* -----------------------------------------------------------------------------
1087  * Buffer Synchronization
1088  */
1089
1090 static DEFINE_SPINLOCK(sync_lock);
1091
1092 struct omap_gem_sync_waiter {
1093         struct list_head list;
1094         struct omap_gem_object *omap_obj;
1095         enum omap_gem_op op;
1096         uint32_t read_target, write_target;
1097         /* notify called w/ sync_lock held */
1098         void (*notify)(void *arg);
1099         void *arg;
1100 };
1101
1102 /* list of omap_gem_sync_waiter.. the notify fxn gets called back when
1103  * the read and/or write target count is achieved which can call a user
1104  * callback (ex. to kick 3d and/or 2d), wakeup blocked task (prep for
1105  * cpu access), etc.
1106  */
1107 static LIST_HEAD(waiters);
1108
1109 static inline bool is_waiting(struct omap_gem_sync_waiter *waiter)
1110 {
1111         struct omap_gem_object *omap_obj = waiter->omap_obj;
1112         if ((waiter->op & OMAP_GEM_READ) &&
1113                         (omap_obj->sync->write_complete < waiter->write_target))
1114                 return true;
1115         if ((waiter->op & OMAP_GEM_WRITE) &&
1116                         (omap_obj->sync->read_complete < waiter->read_target))
1117                 return true;
1118         return false;
1119 }
1120
1121 /* macro for sync debug.. */
1122 #define SYNCDBG 0
1123 #define SYNC(fmt, ...) do { if (SYNCDBG) \
1124                 printk(KERN_ERR "%s:%d: "fmt"\n", \
1125                                 __func__, __LINE__, ##__VA_ARGS__); \
1126         } while (0)
1127
1128
1129 static void sync_op_update(void)
1130 {
1131         struct omap_gem_sync_waiter *waiter, *n;
1132         list_for_each_entry_safe(waiter, n, &waiters, list) {
1133                 if (!is_waiting(waiter)) {
1134                         list_del(&waiter->list);
1135                         SYNC("notify: %p", waiter);
1136                         waiter->notify(waiter->arg);
1137                         kfree(waiter);
1138                 }
1139         }
1140 }
1141
1142 static inline int sync_op(struct drm_gem_object *obj,
1143                 enum omap_gem_op op, bool start)
1144 {
1145         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1146         int ret = 0;
1147
1148         spin_lock(&sync_lock);
1149
1150         if (!omap_obj->sync) {
1151                 omap_obj->sync = kzalloc(sizeof(*omap_obj->sync), GFP_ATOMIC);
1152                 if (!omap_obj->sync) {
1153                         ret = -ENOMEM;
1154                         goto unlock;
1155                 }
1156         }
1157
1158         if (start) {
1159                 if (op & OMAP_GEM_READ)
1160                         omap_obj->sync->read_pending++;
1161                 if (op & OMAP_GEM_WRITE)
1162                         omap_obj->sync->write_pending++;
1163         } else {
1164                 if (op & OMAP_GEM_READ)
1165                         omap_obj->sync->read_complete++;
1166                 if (op & OMAP_GEM_WRITE)
1167                         omap_obj->sync->write_complete++;
1168                 sync_op_update();
1169         }
1170
1171 unlock:
1172         spin_unlock(&sync_lock);
1173
1174         return ret;
1175 }
1176
1177 /* mark the start of read and/or write operation */
1178 int omap_gem_op_start(struct drm_gem_object *obj, enum omap_gem_op op)
1179 {
1180         return sync_op(obj, op, true);
1181 }
1182
1183 int omap_gem_op_finish(struct drm_gem_object *obj, enum omap_gem_op op)
1184 {
1185         return sync_op(obj, op, false);
1186 }
1187
1188 static DECLARE_WAIT_QUEUE_HEAD(sync_event);
1189
1190 static void sync_notify(void *arg)
1191 {
1192         struct task_struct **waiter_task = arg;
1193         *waiter_task = NULL;
1194         wake_up_all(&sync_event);
1195 }
1196
1197 int omap_gem_op_sync(struct drm_gem_object *obj, enum omap_gem_op op)
1198 {
1199         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1200         int ret = 0;
1201         if (omap_obj->sync) {
1202                 struct task_struct *waiter_task = current;
1203                 struct omap_gem_sync_waiter *waiter =
1204                                 kzalloc(sizeof(*waiter), GFP_KERNEL);
1205
1206                 if (!waiter)
1207                         return -ENOMEM;
1208
1209                 waiter->omap_obj = omap_obj;
1210                 waiter->op = op;
1211                 waiter->read_target = omap_obj->sync->read_pending;
1212                 waiter->write_target = omap_obj->sync->write_pending;
1213                 waiter->notify = sync_notify;
1214                 waiter->arg = &waiter_task;
1215
1216                 spin_lock(&sync_lock);
1217                 if (is_waiting(waiter)) {
1218                         SYNC("waited: %p", waiter);
1219                         list_add_tail(&waiter->list, &waiters);
1220                         spin_unlock(&sync_lock);
1221                         ret = wait_event_interruptible(sync_event,
1222                                         (waiter_task == NULL));
1223                         spin_lock(&sync_lock);
1224                         if (waiter_task) {
1225                                 SYNC("interrupted: %p", waiter);
1226                                 /* we were interrupted */
1227                                 list_del(&waiter->list);
1228                                 waiter_task = NULL;
1229                         } else {
1230                                 /* freed in sync_op_update() */
1231                                 waiter = NULL;
1232                         }
1233                 }
1234                 spin_unlock(&sync_lock);
1235                 kfree(waiter);
1236         }
1237         return ret;
1238 }
1239
1240 /* call fxn(arg), either synchronously or asynchronously if the op
1241  * is currently blocked..  fxn() can be called from any context
1242  *
1243  * (TODO for now fxn is called back from whichever context calls
1244  * omap_gem_op_finish().. but this could be better defined later
1245  * if needed)
1246  *
1247  * TODO more code in common w/ _sync()..
1248  */
1249 int omap_gem_op_async(struct drm_gem_object *obj, enum omap_gem_op op,
1250                 void (*fxn)(void *arg), void *arg)
1251 {
1252         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1253         if (omap_obj->sync) {
1254                 struct omap_gem_sync_waiter *waiter =
1255                                 kzalloc(sizeof(*waiter), GFP_ATOMIC);
1256
1257                 if (!waiter)
1258                         return -ENOMEM;
1259
1260                 waiter->omap_obj = omap_obj;
1261                 waiter->op = op;
1262                 waiter->read_target = omap_obj->sync->read_pending;
1263                 waiter->write_target = omap_obj->sync->write_pending;
1264                 waiter->notify = fxn;
1265                 waiter->arg = arg;
1266
1267                 spin_lock(&sync_lock);
1268                 if (is_waiting(waiter)) {
1269                         SYNC("waited: %p", waiter);
1270                         list_add_tail(&waiter->list, &waiters);
1271                         spin_unlock(&sync_lock);
1272                         return 0;
1273                 }
1274
1275                 spin_unlock(&sync_lock);
1276
1277                 kfree(waiter);
1278         }
1279
1280         /* no waiting.. */
1281         fxn(arg);
1282
1283         return 0;
1284 }
1285
1286 /* -----------------------------------------------------------------------------
1287  * Constructor & Destructor
1288  */
1289
1290 void omap_gem_free_object(struct drm_gem_object *obj)
1291 {
1292         struct drm_device *dev = obj->dev;
1293         struct omap_drm_private *priv = dev->dev_private;
1294         struct omap_gem_object *omap_obj = to_omap_bo(obj);
1295
1296         evict(obj);
1297
1298         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
1299
1300         spin_lock(&priv->list_lock);
1301         list_del(&omap_obj->mm_list);
1302         spin_unlock(&priv->list_lock);
1303
1304         /* this means the object is still pinned.. which really should
1305          * not happen.  I think..
1306          */
1307         WARN_ON(omap_obj->paddr_cnt > 0);
1308
1309         if (omap_obj->pages) {
1310                 if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
1311                         kfree(omap_obj->pages);
1312                 else
1313                         omap_gem_detach_pages(obj);
1314         }
1315
1316         if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
1317                 dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
1318                             omap_obj->paddr);
1319         } else if (omap_obj->vaddr) {
1320                 vunmap(omap_obj->vaddr);
1321         } else if (obj->import_attach) {
1322                 drm_prime_gem_destroy(obj, omap_obj->sgt);
1323         }
1324
1325         kfree(omap_obj->sync);
1326
1327         drm_gem_object_release(obj);
1328
1329         kfree(omap_obj);
1330 }
1331
1332 /* GEM buffer object constructor */
1333 struct drm_gem_object *omap_gem_new(struct drm_device *dev,
1334                 union omap_gem_size gsize, uint32_t flags)
1335 {
1336         struct omap_drm_private *priv = dev->dev_private;
1337         struct omap_gem_object *omap_obj;
1338         struct drm_gem_object *obj;
1339         struct address_space *mapping;
1340         size_t size;
1341         int ret;
1342
1343         /* Validate the flags and compute the memory and cache flags. */
1344         if (flags & OMAP_BO_TILED) {
1345                 if (!priv->usergart) {
1346                         dev_err(dev->dev, "Tiled buffers require DMM\n");
1347                         return NULL;
1348                 }
1349
1350                 /*
1351                  * Tiled buffers are always shmem paged backed. When they are
1352                  * scanned out, they are remapped into DMM/TILER.
1353                  */
1354                 flags &= ~OMAP_BO_SCANOUT;
1355                 flags |= OMAP_BO_MEM_SHMEM;
1356
1357                 /*
1358                  * Currently don't allow cached buffers. There is some caching
1359                  * stuff that needs to be handled better.
1360                  */
1361                 flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
1362                 flags |= tiler_get_cpu_cache_flags();
1363         } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
1364                 /*
1365                  * OMAP_BO_SCANOUT hints that the buffer doesn't need to be
1366                  * tiled. However, to lower the pressure on memory allocation,
1367                  * use contiguous memory only if no TILER is available.
1368                  */
1369                 flags |= OMAP_BO_MEM_DMA_API;
1370         } else if (!(flags & OMAP_BO_MEM_DMABUF)) {
1371                 /*
1372                  * All other buffers not backed by dma_buf are shmem-backed.
1373                  */
1374                 flags |= OMAP_BO_MEM_SHMEM;
1375         }
1376
1377         /* Allocate the initialize the OMAP GEM object. */
1378         omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
1379         if (!omap_obj)
1380                 return NULL;
1381
1382         obj = &omap_obj->base;
1383         omap_obj->flags = flags;
1384
1385         if (flags & OMAP_BO_TILED) {
1386                 /*
1387                  * For tiled buffers align dimensions to slot boundaries and
1388                  * calculate size based on aligned dimensions.
1389                  */
1390                 tiler_align(gem2fmt(flags), &gsize.tiled.width,
1391                             &gsize.tiled.height);
1392
1393                 size = tiler_size(gem2fmt(flags), gsize.tiled.width,
1394                                   gsize.tiled.height);
1395
1396                 omap_obj->width = gsize.tiled.width;
1397                 omap_obj->height = gsize.tiled.height;
1398         } else {
1399                 size = PAGE_ALIGN(gsize.bytes);
1400         }
1401
1402         /* Initialize the GEM object. */
1403         if (!(flags & OMAP_BO_MEM_SHMEM)) {
1404                 drm_gem_private_object_init(dev, obj, size);
1405         } else {
1406                 ret = drm_gem_object_init(dev, obj, size);
1407                 if (ret)
1408                         goto err_free;
1409
1410                 mapping = file_inode(obj->filp)->i_mapping;
1411                 mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
1412         }
1413
1414         /* Allocate memory if needed. */
1415         if (flags & OMAP_BO_MEM_DMA_API) {
1416                 omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
1417                                                &omap_obj->paddr,
1418                                                GFP_KERNEL);
1419                 if (!omap_obj->vaddr)
1420                         goto err_release;
1421         }
1422
1423         spin_lock(&priv->list_lock);
1424         list_add(&omap_obj->mm_list, &priv->obj_list);
1425         spin_unlock(&priv->list_lock);
1426
1427         return obj;
1428
1429 err_release:
1430         drm_gem_object_release(obj);
1431 err_free:
1432         kfree(omap_obj);
1433         return NULL;
1434 }
1435
1436 struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
1437                                            struct sg_table *sgt)
1438 {
1439         struct omap_drm_private *priv = dev->dev_private;
1440         struct omap_gem_object *omap_obj;
1441         struct drm_gem_object *obj;
1442         union omap_gem_size gsize;
1443
1444         /* Without a DMM only physically contiguous buffers can be supported. */
1445         if (sgt->orig_nents != 1 && !priv->has_dmm)
1446                 return ERR_PTR(-EINVAL);
1447
1448         mutex_lock(&dev->struct_mutex);
1449
1450         gsize.bytes = PAGE_ALIGN(size);
1451         obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
1452         if (!obj) {
1453                 obj = ERR_PTR(-ENOMEM);
1454                 goto done;
1455         }
1456
1457         omap_obj = to_omap_bo(obj);
1458         omap_obj->sgt = sgt;
1459
1460         if (sgt->orig_nents == 1) {
1461                 omap_obj->paddr = sg_dma_address(sgt->sgl);
1462         } else {
1463                 /* Create pages list from sgt */
1464                 struct sg_page_iter iter;
1465                 struct page **pages;
1466                 unsigned int npages;
1467                 unsigned int i = 0;
1468
1469                 npages = DIV_ROUND_UP(size, PAGE_SIZE);
1470                 pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
1471                 if (!pages) {
1472                         omap_gem_free_object(obj);
1473                         obj = ERR_PTR(-ENOMEM);
1474                         goto done;
1475                 }
1476
1477                 omap_obj->pages = pages;
1478
1479                 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
1480                         pages[i++] = sg_page_iter_page(&iter);
1481                         if (i > npages)
1482                                 break;
1483                 }
1484
1485                 if (WARN_ON(i != npages)) {
1486                         omap_gem_free_object(obj);
1487                         obj = ERR_PTR(-ENOMEM);
1488                         goto done;
1489                 }
1490         }
1491
1492 done:
1493         mutex_unlock(&dev->struct_mutex);
1494         return obj;
1495 }
1496
1497 /* convenience method to construct a GEM buffer object, and userspace handle */
1498 int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
1499                 union omap_gem_size gsize, uint32_t flags, uint32_t *handle)
1500 {
1501         struct drm_gem_object *obj;
1502         int ret;
1503
1504         obj = omap_gem_new(dev, gsize, flags);
1505         if (!obj)
1506                 return -ENOMEM;
1507
1508         ret = drm_gem_handle_create(file, obj, handle);
1509         if (ret) {
1510                 omap_gem_free_object(obj);
1511                 return ret;
1512         }
1513
1514         /* drop reference from allocate - handle holds it now */
1515         drm_gem_object_unreference_unlocked(obj);
1516
1517         return 0;
1518 }
1519
1520 /* -----------------------------------------------------------------------------
1521  * Init & Cleanup
1522  */
1523
1524 /* If DMM is used, we need to set some stuff up.. */
1525 void omap_gem_init(struct drm_device *dev)
1526 {
1527         struct omap_drm_private *priv = dev->dev_private;
1528         struct omap_drm_usergart *usergart;
1529         const enum tiler_fmt fmts[] = {
1530                         TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
1531         };
1532         int i, j;
1533
1534         if (!dmm_is_available()) {
1535                 /* DMM only supported on OMAP4 and later, so this isn't fatal */
1536                 dev_warn(dev->dev, "DMM not available, disable DMM support\n");
1537                 return;
1538         }
1539
1540         usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
1541         if (!usergart)
1542                 return;
1543
1544         /* reserve 4k aligned/wide regions for userspace mappings: */
1545         for (i = 0; i < ARRAY_SIZE(fmts); i++) {
1546                 uint16_t h = 1, w = PAGE_SIZE >> i;
1547                 tiler_align(fmts[i], &w, &h);
1548                 /* note: since each region is 1 4kb page wide, and minimum
1549                  * number of rows, the height ends up being the same as the
1550                  * # of pages in the region
1551                  */
1552                 usergart[i].height = h;
1553                 usergart[i].height_shift = ilog2(h);
1554                 usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
1555                 usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
1556                 for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
1557                         struct omap_drm_usergart_entry *entry;
1558                         struct tiler_block *block;
1559
1560                         entry = &usergart[i].entry[j];
1561                         block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
1562                         if (IS_ERR(block)) {
1563                                 dev_err(dev->dev,
1564                                                 "reserve failed: %d, %d, %ld\n",
1565                                                 i, j, PTR_ERR(block));
1566                                 return;
1567                         }
1568                         entry->paddr = tiler_ssptr(block);
1569                         entry->block = block;
1570
1571                         DBG("%d:%d: %dx%d: paddr=%pad stride=%d", i, j, w, h,
1572                                         &entry->paddr,
1573                                         usergart[i].stride_pfn << PAGE_SHIFT);
1574                 }
1575         }
1576
1577         priv->usergart = usergart;
1578         priv->has_dmm = true;
1579 }
1580
1581 void omap_gem_deinit(struct drm_device *dev)
1582 {
1583         struct omap_drm_private *priv = dev->dev_private;
1584
1585         /* I believe we can rely on there being no more outstanding GEM
1586          * objects which could depend on usergart/dmm at this point.
1587          */
1588         kfree(priv->usergart);
1589 }