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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
  * Author: Rob Clark <rob.clark@linaro.org>
  */
 
 #include <linux/dma-mapping.h>
 #include <linux/seq_file.h>
 #include <linux/shmem_fs.h>
 #include <linux/spinlock.h>
 #include <linux/pfn_t.h>
 
 #include <drm/drm_prime.h>
 #include <drm/drm_vma_manager.h>
 
 #include "omap_drv.h"
 #include "omap_dmm_tiler.h"
 
 /*
  * GEM buffer object implementation.
  */
 
 /* note: we use upper 8 bits of flags for driver-internal flags: */
 #define OMAP_BO_MEM_DMA_API 0x01000000  /* memory allocated with the dma_alloc_* API */
 #define OMAP_BO_MEM_SHMEM   0x02000000  /* memory allocated through shmem backing */
 #define OMAP_BO_MEM_DMABUF  0x08000000  /* memory imported from a dmabuf */
 
 struct omap_gem_object {
     struct drm_gem_object base;
 
     struct list_head mm_list;
 
     u32 flags;
 
     /** width/height for tiled formats (rounded up to slot boundaries) */
     u16 width, height;
 
     /** roll applied when mapping to DMM */
     u32 roll;
 
     /** protects pin_cnt, block, pages, dma_addrs and vaddr */
     struct mutex lock;
 
     /**
      * dma_addr contains the buffer DMA address. It is valid for
      *
      * - buffers allocated through the DMA mapping API (with the
      *   OMAP_BO_MEM_DMA_API flag set)
      *
      * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
      *   if they are physically contiguous (when sgt->orig_nents == 1)
      *
      * - buffers mapped through the TILER when pin_cnt is not zero, in which
      *   case the DMA address points to the TILER aperture
      *
      * Physically contiguous buffers have their DMA address equal to the
      * physical address as we don't remap those buffers through the TILER.
      *
      * Buffers mapped to the TILER have their DMA address pointing to the
      * TILER aperture. As TILER mappings are refcounted (through pin_cnt)
      * the DMA address must be accessed through omap_gem_pin() to ensure
      * that the mapping won't disappear unexpectedly. References must be
      * released with omap_gem_unpin().
      */
     dma_addr_t dma_addr;
 
     /**
      * # of users
      */
     refcount_t pin_cnt;
 
     /**
      * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
      * is set and the sgt field is valid.
      */
     struct sg_table *sgt;
 
     /**
      * tiler block used when buffer is remapped in DMM/TILER.
      */
     struct tiler_block *block;
 
     /**
      * Array of backing pages, if allocated.  Note that pages are never
      * allocated for buffers originally allocated from contiguous memory
      */
     struct page **pages;
 
     /** addresses corresponding to pages in above array */
     dma_addr_t *dma_addrs;
 
     /**
      * Virtual address, if mapped.
      */
     void *vaddr;
 };
 
 #define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
 
 /* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
  * not necessarily pinned in TILER all the time, and (b) when they are
  * they are not necessarily page aligned, we reserve one or more small
  * regions in each of the 2d containers to use as a user-GART where we
  * can create a second page-aligned mapping of parts of the buffer
  * being accessed from userspace.
  *
  * Note that we could optimize slightly when we know that multiple
  * tiler containers are backed by the same PAT.. but I'll leave that
  * for later..
  */
 #define NUM_USERGART_ENTRIES 2
 struct omap_drm_usergart_entry {
     struct tiler_block *block;  /* the reserved tiler block */
     dma_addr_t dma_addr;
     struct drm_gem_object *obj; /* the current pinned obj */
     pgoff_t obj_pgoff;      /* page offset of obj currently
                        mapped in */
 };
 
 struct omap_drm_usergart {
     struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
     int height;             /* height in rows */
     int height_shift;       /* ilog2(height in rows) */
     int slot_shift;         /* ilog2(width per slot) */
     int stride_pfn;         /* stride in pages */
     int last;               /* index of last used entry */
 };
 
 /* -----------------------------------------------------------------------------
  * Helpers
  */
 
 /** get mmap offset */
 u64 omap_gem_mmap_offset(struct drm_gem_object *obj)
 {
     struct drm_device *dev = obj->dev;
     int ret;
     size_t size;
 
     /* Make it mmapable */
     size = omap_gem_mmap_size(obj);
     ret = drm_gem_create_mmap_offset_size(obj, size);
     if (ret) {
         dev_err(dev->dev, "could not allocate mmap offset\n");
         return 0;
     }
 
     return drm_vma_node_offset_addr(&obj->vma_node);
 }
 
 static bool omap_gem_is_contiguous(struct omap_gem_object *omap_obj)
 {
     if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
         return true;
 
     if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
         return true;
 
     return false;
 }
 
 /* -----------------------------------------------------------------------------
  * Eviction
  */
 
 static void omap_gem_evict_entry(struct drm_gem_object *obj,
         enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     struct omap_drm_private *priv = obj->dev->dev_private;
     int n = priv->usergart[fmt].height;
     size_t size = PAGE_SIZE * n;
     loff_t off = omap_gem_mmap_offset(obj) +
             (entry->obj_pgoff << PAGE_SHIFT);
     const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
 
     if (m > 1) {
         int i;
         /* if stride > than PAGE_SIZE then sparse mapping: */
         for (i = n; i > 0; i--) {
             unmap_mapping_range(obj->dev->anon_inode->i_mapping,
                         off, PAGE_SIZE, 1);
             off += PAGE_SIZE * m;
         }
     } else {
         unmap_mapping_range(obj->dev->anon_inode->i_mapping,
                     off, size, 1);
     }
 
     entry->obj = NULL;
 }
 
 /* Evict a buffer from usergart, if it is mapped there */
 static void omap_gem_evict(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     struct omap_drm_private *priv = obj->dev->dev_private;
 
     if (omap_obj->flags & OMAP_BO_TILED_MASK) {
         enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
         int i;
 
         for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
             struct omap_drm_usergart_entry *entry =
                 &priv->usergart[fmt].entry[i];
 
             if (entry->obj == obj)
                 omap_gem_evict_entry(obj, fmt, entry);
         }
     }
 }
 
 /* -----------------------------------------------------------------------------
  * Page Management
  */
 
 /*
  * Ensure backing pages are allocated. Must be called with the omap_obj.lock
  * held.
  */
 static int omap_gem_attach_pages(struct drm_gem_object *obj)
 {
     struct drm_device *dev = obj->dev;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     struct page **pages;
     int npages = obj->size >> PAGE_SHIFT;
     int i, ret;
     dma_addr_t *addrs;
 
     lockdep_assert_held(&omap_obj->lock);
 
     /*
      * If not using shmem (in which case backing pages don't need to be
      * allocated) or if pages are already allocated we're done.
      */
     if (!(omap_obj->flags & OMAP_BO_MEM_SHMEM) || omap_obj->pages)
         return 0;
 
     pages = drm_gem_get_pages(obj);
     if (IS_ERR(pages)) {
         dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
         return PTR_ERR(pages);
     }
 
     /* for non-cached buffers, ensure the new pages are clean because
      * DSS, GPU, etc. are not cache coherent:
      */
     if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
         addrs = kmalloc_array(npages, sizeof(*addrs), GFP_KERNEL);
         if (!addrs) {
             ret = -ENOMEM;
             goto free_pages;
         }
 
         for (i = 0; i < npages; i++) {
             addrs[i] = dma_map_page(dev->dev, pages[i],
                     0, PAGE_SIZE, DMA_TO_DEVICE);
 
             if (dma_mapping_error(dev->dev, addrs[i])) {
                 dev_warn(dev->dev,
                     "%s: failed to map page\n", __func__);
 
                 for (i = i - 1; i >= 0; --i) {
                     dma_unmap_page(dev->dev, addrs[i],
                         PAGE_SIZE, DMA_TO_DEVICE);
                 }
 
                 ret = -ENOMEM;
                 goto free_addrs;
             }
         }
     } else {
         addrs = kcalloc(npages, sizeof(*addrs), GFP_KERNEL);
         if (!addrs) {
             ret = -ENOMEM;
             goto free_pages;
         }
     }
 
     omap_obj->dma_addrs = addrs;
     omap_obj->pages = pages;
 
     return 0;
 
 free_addrs:
     kfree(addrs);
 free_pages:
     drm_gem_put_pages(obj, pages, true, false);
 
     return ret;
 }
 
 /* Release backing pages. Must be called with the omap_obj.lock held. */
 static void omap_gem_detach_pages(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     unsigned int npages = obj->size >> PAGE_SHIFT;
     unsigned int i;
 
     lockdep_assert_held(&omap_obj->lock);
 
     for (i = 0; i < npages; i++) {
         if (omap_obj->dma_addrs[i])
             dma_unmap_page(obj->dev->dev, omap_obj->dma_addrs[i],
                        PAGE_SIZE, DMA_TO_DEVICE);
     }
 
     kfree(omap_obj->dma_addrs);
     omap_obj->dma_addrs = NULL;
 
     drm_gem_put_pages(obj, omap_obj->pages, true, false);
     omap_obj->pages = NULL;
 }
 
 /* get buffer flags */
 u32 omap_gem_flags(struct drm_gem_object *obj)
 {
     return to_omap_bo(obj)->flags;
 }
 
 /** get mmap size */
 size_t omap_gem_mmap_size(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     size_t size = obj->size;
 
     if (omap_obj->flags & OMAP_BO_TILED_MASK) {
         /* for tiled buffers, the virtual size has stride rounded up
          * to 4kb.. (to hide the fact that row n+1 might start 16kb or
          * 32kb later!).  But we don't back the entire buffer with
          * pages, only the valid picture part.. so need to adjust for
          * this in the size used to mmap and generate mmap offset
          */
         size = tiler_vsize(gem2fmt(omap_obj->flags),
                 omap_obj->width, omap_obj->height);
     }
 
     return size;
 }
 
 /* -----------------------------------------------------------------------------
  * Fault Handling
  */
 
 /* Normal handling for the case of faulting in non-tiled buffers */
 static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj,
         struct vm_area_struct *vma, struct vm_fault *vmf)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     unsigned long pfn;
     pgoff_t pgoff;
 
     /* We don't use vmf->pgoff since that has the fake offset: */
     pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
     if (omap_obj->pages) {
         omap_gem_cpu_sync_page(obj, pgoff);
         pfn = page_to_pfn(omap_obj->pages[pgoff]);
     } else {
         BUG_ON(!omap_gem_is_contiguous(omap_obj));
         pfn = (omap_obj->dma_addr >> PAGE_SHIFT) + pgoff;
     }
 
     VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
             pfn, pfn << PAGE_SHIFT);
 
     return vmf_insert_mixed(vma, vmf->address,
             __pfn_to_pfn_t(pfn, PFN_DEV));
 }
 
 /* Special handling for the case of faulting in 2d tiled buffers */
 static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj,
         struct vm_area_struct *vma, struct vm_fault *vmf)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     struct omap_drm_private *priv = obj->dev->dev_private;
     struct omap_drm_usergart_entry *entry;
     enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
     struct page *pages[64];  /* XXX is this too much to have on stack? */
     unsigned long pfn;
     pgoff_t pgoff, base_pgoff;
     unsigned long vaddr;
     int i, err, slots;
     vm_fault_t ret = VM_FAULT_NOPAGE;
 
     /*
      * Note the height of the slot is also equal to the number of pages
      * that need to be mapped in to fill 4kb wide CPU page.  If the slot
      * height is 64, then 64 pages fill a 4kb wide by 64 row region.
      */
     const int n = priv->usergart[fmt].height;
     const int n_shift = priv->usergart[fmt].height_shift;
 
     /*
      * If buffer width in bytes > PAGE_SIZE then the virtual stride is
      * rounded up to next multiple of PAGE_SIZE.. this need to be taken
      * into account in some of the math, so figure out virtual stride
      * in pages
      */
     const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
 
     /* We don't use vmf->pgoff since that has the fake offset: */
     pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 
     /*
      * Actual address we start mapping at is rounded down to previous slot
      * boundary in the y direction:
      */
     base_pgoff = round_down(pgoff, m << n_shift);
 
     /* figure out buffer width in slots */
     slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
 
     vaddr = vmf->address - ((pgoff - base_pgoff) << PAGE_SHIFT);
 
     entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
 
     /* evict previous buffer using this usergart entry, if any: */
     if (entry->obj)
         omap_gem_evict_entry(entry->obj, fmt, entry);
 
     entry->obj = obj;
     entry->obj_pgoff = base_pgoff;
 
     /* now convert base_pgoff to phys offset from virt offset: */
     base_pgoff = (base_pgoff >> n_shift) * slots;
 
     /* for wider-than 4k.. figure out which part of the slot-row we want: */
     if (m > 1) {
         int off = pgoff % m;
         entry->obj_pgoff += off;
         base_pgoff /= m;
         slots = min(slots - (off << n_shift), n);
         base_pgoff += off << n_shift;
         vaddr += off << PAGE_SHIFT;
     }
 
     /*
      * Map in pages. Beyond the valid pixel part of the buffer, we set
      * pages[i] to NULL to get a dummy page mapped in.. if someone
      * reads/writes it they will get random/undefined content, but at
      * least it won't be corrupting whatever other random page used to
      * be mapped in, or other undefined behavior.
      */
     memcpy(pages, &omap_obj->pages[base_pgoff],
             sizeof(struct page *) * slots);
     memset(pages + slots, 0,
             sizeof(struct page *) * (n - slots));
 
     err = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
     if (err) {
         ret = vmf_error(err);
         dev_err(obj->dev->dev, "failed to pin: %d\n", err);
         return ret;
     }
 
     pfn = entry->dma_addr >> PAGE_SHIFT;
 
     VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
             pfn, pfn << PAGE_SHIFT);
 
     for (i = n; i > 0; i--) {
         ret = vmf_insert_mixed(vma,
             vaddr, __pfn_to_pfn_t(pfn, PFN_DEV));
         if (ret & VM_FAULT_ERROR)
             break;
         pfn += priv->usergart[fmt].stride_pfn;
         vaddr += PAGE_SIZE * m;
     }
 
     /* simple round-robin: */
     priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
                  % NUM_USERGART_ENTRIES;
 
     return ret;
 }
 
 /**
  * omap_gem_fault       -   pagefault handler for GEM objects
  * @vmf: fault detail
  *
  * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
  * does most of the work for us including the actual map/unmap calls
  * but we need to do the actual page work.
  *
  * The VMA was set up by GEM. In doing so it also ensured that the
  * vma->vm_private_data points to the GEM object that is backing this
  * mapping.
  */
 static vm_fault_t omap_gem_fault(struct vm_fault *vmf)
 {
     struct vm_area_struct *vma = vmf->vma;
     struct drm_gem_object *obj = vma->vm_private_data;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int err;
     vm_fault_t ret;
 
     /* Make sure we don't parallel update on a fault, nor move or remove
      * something from beneath our feet
      */
     mutex_lock(&omap_obj->lock);
 
     /* if a shmem backed object, make sure we have pages attached now */
     err = omap_gem_attach_pages(obj);
     if (err) {
         ret = vmf_error(err);
         goto fail;
     }
 
     /* where should we do corresponding put_pages().. we are mapping
      * the original page, rather than thru a GART, so we can't rely
      * on eviction to trigger this.  But munmap() or all mappings should
      * probably trigger put_pages()?
      */
 
     if (omap_obj->flags & OMAP_BO_TILED_MASK)
         ret = omap_gem_fault_2d(obj, vma, vmf);
     else
         ret = omap_gem_fault_1d(obj, vma, vmf);
 
 
 fail:
     mutex_unlock(&omap_obj->lock);
     return ret;
 }
 
 /** We override mainly to fix up some of the vm mapping flags.. */
 int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 {
     int ret;
 
     ret = drm_gem_mmap(filp, vma);
     if (ret) {
         DBG("mmap failed: %d", ret);
         return ret;
     }
 
     return omap_gem_mmap_obj(vma->vm_private_data, vma);
 }
 
 int omap_gem_mmap_obj(struct drm_gem_object *obj,
         struct vm_area_struct *vma)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
 
     vma->vm_flags &= ~VM_PFNMAP;
     vma->vm_flags |= VM_MIXEDMAP;
 
     if (omap_obj->flags & OMAP_BO_WC) {
         vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
     } else if (omap_obj->flags & OMAP_BO_UNCACHED) {
         vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
     } else {
         /*
          * We do have some private objects, at least for scanout buffers
          * on hardware without DMM/TILER.  But these are allocated write-
          * combine
          */
         if (WARN_ON(!obj->filp))
             return -EINVAL;
 
         /*
          * Shunt off cached objs to shmem file so they have their own
          * address_space (so unmap_mapping_range does what we want,
          * in particular in the case of mmap'd dmabufs)
          */
         vma->vm_pgoff = 0;
         vma_set_file(vma, obj->filp);
 
         vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
     }
 
     return 0;
 }
 
 /* -----------------------------------------------------------------------------
  * Dumb Buffers
  */
 
 /**
  * omap_gem_dumb_create -   create a dumb buffer
  * @file: our client file
  * @dev: our device
  * @args: the requested arguments copied from userspace
  *
  * Allocate a buffer suitable for use for a frame buffer of the
  * form described by user space. Give userspace a handle by which
  * to reference it.
  */
 int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
         struct drm_mode_create_dumb *args)
 {
     union omap_gem_size gsize;
 
     args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 
     args->size = PAGE_ALIGN(args->pitch * args->height);
 
     gsize = (union omap_gem_size){
         .bytes = args->size,
     };
 
     return omap_gem_new_handle(dev, file, gsize,
             OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
 }
 
 /**
  * omap_gem_dumb_map    -   buffer mapping for dumb interface
  * @file: our drm client file
  * @dev: drm device
  * @handle: GEM handle to the object (from dumb_create)
  * @offset: memory map offset placeholder
  *
  * Do the necessary setup to allow the mapping of the frame buffer
  * into user memory. We don't have to do much here at the moment.
  */
 int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
         u32 handle, u64 *offset)
 {
     struct drm_gem_object *obj;
     int ret = 0;
 
     /* GEM does all our handle to object mapping */
     obj = drm_gem_object_lookup(file, handle);
     if (obj == NULL) {
         ret = -ENOENT;
         goto fail;
     }
 
     *offset = omap_gem_mmap_offset(obj);
 
     drm_gem_object_put(obj);
 
 fail:
     return ret;
 }
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 /* Set scrolling position.  This allows us to implement fast scrolling
  * for console.
  *
  * Call only from non-atomic contexts.
  */
 int omap_gem_roll(struct drm_gem_object *obj, u32 roll)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     u32 npages = obj->size >> PAGE_SHIFT;
     int ret = 0;
 
     if (roll > npages) {
         dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
         return -EINVAL;
     }
 
     omap_obj->roll = roll;
 
     mutex_lock(&omap_obj->lock);
 
     /* if we aren't mapped yet, we don't need to do anything */
     if (omap_obj->block) {
         ret = omap_gem_attach_pages(obj);
         if (ret)
             goto fail;
 
         ret = tiler_pin(omap_obj->block, omap_obj->pages, npages,
                 roll, true);
         if (ret)
             dev_err(obj->dev->dev, "could not repin: %d\n", ret);
     }
 
 fail:
     mutex_unlock(&omap_obj->lock);
 
     return ret;
 }
 #endif
 
 /* -----------------------------------------------------------------------------
  * Memory Management & DMA Sync
  */
 
 /*
  * shmem buffers that are mapped cached are not coherent.
  *
  * We keep track of dirty pages using page faulting to perform cache management.
  * When a page is mapped to the CPU in read/write mode the device can't access
  * it and omap_obj->dma_addrs[i] is NULL. When a page is mapped to the device
  * the omap_obj->dma_addrs[i] is set to the DMA address, and the page is
  * unmapped from the CPU.
  */
 static inline bool omap_gem_is_cached_coherent(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
 
     return !((omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
         ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED));
 }
 
 /* Sync the buffer for CPU access.. note pages should already be
  * attached, ie. omap_gem_get_pages()
  */
 void omap_gem_cpu_sync_page(struct drm_gem_object *obj, int pgoff)
 {
     struct drm_device *dev = obj->dev;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
 
     if (omap_gem_is_cached_coherent(obj))
         return;
 
     if (omap_obj->dma_addrs[pgoff]) {
         dma_unmap_page(dev->dev, omap_obj->dma_addrs[pgoff],
                 PAGE_SIZE, DMA_TO_DEVICE);
         omap_obj->dma_addrs[pgoff] = 0;
     }
 }
 
 /* sync the buffer for DMA access */
 void omap_gem_dma_sync_buffer(struct drm_gem_object *obj,
         enum dma_data_direction dir)
 {
     struct drm_device *dev = obj->dev;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int i, npages = obj->size >> PAGE_SHIFT;
     struct page **pages = omap_obj->pages;
     bool dirty = false;
 
     if (omap_gem_is_cached_coherent(obj))
         return;
 
     for (i = 0; i < npages; i++) {
         if (!omap_obj->dma_addrs[i]) {
             dma_addr_t addr;
 
             addr = dma_map_page(dev->dev, pages[i], 0,
                         PAGE_SIZE, dir);
             if (dma_mapping_error(dev->dev, addr)) {
                 dev_warn(dev->dev, "%s: failed to map page\n",
                     __func__);
                 break;
             }
 
             dirty = true;
             omap_obj->dma_addrs[i] = addr;
         }
     }
 
     if (dirty) {
         unmap_mapping_range(obj->filp->f_mapping, 0,
                     omap_gem_mmap_size(obj), 1);
     }
 }
 
 static int omap_gem_pin_tiler(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     u32 npages = obj->size >> PAGE_SHIFT;
     enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
     struct tiler_block *block;
     int ret;
 
     BUG_ON(omap_obj->block);
 
     if (omap_obj->flags & OMAP_BO_TILED_MASK) {
         block = tiler_reserve_2d(fmt, omap_obj->width, omap_obj->height,
                      PAGE_SIZE);
     } else {
         block = tiler_reserve_1d(obj->size);
     }
 
     if (IS_ERR(block)) {
         ret = PTR_ERR(block);
         dev_err(obj->dev->dev, "could not remap: %d (%d)\n", ret, fmt);
         goto fail;
     }
 
     /* TODO: enable async refill.. */
     ret = tiler_pin(block, omap_obj->pages, npages, omap_obj->roll, true);
     if (ret) {
         tiler_release(block);
         dev_err(obj->dev->dev, "could not pin: %d\n", ret);
         goto fail;
     }
 
     omap_obj->dma_addr = tiler_ssptr(block);
     omap_obj->block = block;
 
     DBG("got dma address: %pad", &omap_obj->dma_addr);
 
 fail:
     return ret;
 }
 
 /**
  * omap_gem_pin() - Pin a GEM object in memory
  * @obj: the GEM object
  * @dma_addr: the DMA address
  *
  * Pin the given GEM object in memory and fill the dma_addr pointer with the
  * object's DMA address. If the buffer is not physically contiguous it will be
  * remapped through the TILER to provide a contiguous view.
  *
  * Pins are reference-counted, calling this function multiple times is allowed
  * as long the corresponding omap_gem_unpin() calls are balanced.
  *
  * Return 0 on success or a negative error code otherwise.
  */
 int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr)
 {
     struct omap_drm_private *priv = obj->dev->dev_private;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int ret = 0;
 
     mutex_lock(&omap_obj->lock);
 
     if (!omap_gem_is_contiguous(omap_obj)) {
         if (refcount_read(&omap_obj->pin_cnt) == 0) {
 
             refcount_set(&omap_obj->pin_cnt, 1);
 
             ret = omap_gem_attach_pages(obj);
             if (ret)
                 goto fail;
 
             if (omap_obj->flags & OMAP_BO_SCANOUT) {
                 if (priv->has_dmm) {
                     ret = omap_gem_pin_tiler(obj);
                     if (ret)
                         goto fail;
                 }
             }
         } else {
             refcount_inc(&omap_obj->pin_cnt);
         }
     }
 
     if (dma_addr)
         *dma_addr = omap_obj->dma_addr;
 
 fail:
     mutex_unlock(&omap_obj->lock);
 
     return ret;
 }
 
 /**
  * omap_gem_unpin_locked() - Unpin a GEM object from memory
  * @obj: the GEM object
  *
  * omap_gem_unpin() without locking.
  */
 static void omap_gem_unpin_locked(struct drm_gem_object *obj)
 {
     struct omap_drm_private *priv = obj->dev->dev_private;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int ret;
 
     if (omap_gem_is_contiguous(omap_obj))
         return;
 
     if (refcount_dec_and_test(&omap_obj->pin_cnt)) {
         if (omap_obj->sgt) {
             sg_free_table(omap_obj->sgt);
             kfree(omap_obj->sgt);
             omap_obj->sgt = NULL;
         }
         if (!(omap_obj->flags & OMAP_BO_SCANOUT))
             return;
         if (priv->has_dmm) {
             ret = tiler_unpin(omap_obj->block);
             if (ret) {
                 dev_err(obj->dev->dev,
                     "could not unpin pages: %d\n", ret);
             }
             ret = tiler_release(omap_obj->block);
             if (ret) {
                 dev_err(obj->dev->dev,
                     "could not release unmap: %d\n", ret);
             }
             omap_obj->dma_addr = 0;
             omap_obj->block = NULL;
         }
     }
 }
 
 /**
  * omap_gem_unpin() - Unpin a GEM object from memory
  * @obj: the GEM object
  *
  * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are
  * reference-counted, the actual unpin will only be performed when the number
  * of calls to this function matches the number of calls to omap_gem_pin().
  */
 void omap_gem_unpin(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
 
     mutex_lock(&omap_obj->lock);
     omap_gem_unpin_locked(obj);
     mutex_unlock(&omap_obj->lock);
 }
 
 /* Get rotated scanout address (only valid if already pinned), at the
  * specified orientation and x,y offset from top-left corner of buffer
  * (only valid for tiled 2d buffers)
  */
 int omap_gem_rotated_dma_addr(struct drm_gem_object *obj, u32 orient,
         int x, int y, dma_addr_t *dma_addr)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int ret = -EINVAL;
 
     mutex_lock(&omap_obj->lock);
 
     if ((refcount_read(&omap_obj->pin_cnt) > 0) && omap_obj->block &&
             (omap_obj->flags & OMAP_BO_TILED_MASK)) {
         *dma_addr = tiler_tsptr(omap_obj->block, orient, x, y);
         ret = 0;
     }
 
     mutex_unlock(&omap_obj->lock);
 
     return ret;
 }
 
 /* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
 int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int ret = -EINVAL;
     if (omap_obj->flags & OMAP_BO_TILED_MASK)
         ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
     return ret;
 }
 
 /* if !remap, and we don't have pages backing, then fail, rather than
  * increasing the pin count (which we don't really do yet anyways,
  * because we don't support swapping pages back out).  And 'remap'
  * might not be quite the right name, but I wanted to keep it working
  * similarly to omap_gem_pin().  Note though that mutex is not
  * aquired if !remap (because this can be called in atomic ctxt),
  * but probably omap_gem_unpin() should be changed to work in the
  * same way.  If !remap, a matching omap_gem_put_pages() call is not
  * required (and should not be made).
  */
 int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
         bool remap)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     int ret = 0;
 
     mutex_lock(&omap_obj->lock);
 
     if (remap) {
         ret = omap_gem_attach_pages(obj);
         if (ret)
             goto unlock;
     }
 
     if (!omap_obj->pages) {
         ret = -ENOMEM;
         goto unlock;
     }
 
     *pages = omap_obj->pages;
 
 unlock:
     mutex_unlock(&omap_obj->lock);
 
     return ret;
 }
 
 /* release pages when DMA no longer being performed */
 int omap_gem_put_pages(struct drm_gem_object *obj)
 {
     /* do something here if we dynamically attach/detach pages.. at
      * least they would no longer need to be pinned if everyone has
      * released the pages..
      */
     return 0;
 }
 
 struct sg_table *omap_gem_get_sg(struct drm_gem_object *obj,
         enum dma_data_direction dir)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     dma_addr_t addr;
     struct sg_table *sgt;
     struct scatterlist *sg;
     unsigned int count, len, stride, i;
     int ret;
 
     ret = omap_gem_pin(obj, &addr);
     if (ret)
         return ERR_PTR(ret);
 
     mutex_lock(&omap_obj->lock);
 
     sgt = omap_obj->sgt;
     if (sgt)
         goto out;
 
     sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
     if (!sgt) {
         ret = -ENOMEM;
         goto err_unpin;
     }
 
     if (addr) {
         if (omap_obj->flags & OMAP_BO_TILED_MASK) {
             enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
 
             len = omap_obj->width << (int)fmt;
             count = omap_obj->height;
             stride = tiler_stride(fmt, 0);
         } else {
             len = obj->size;
             count = 1;
             stride = 0;
         }
     } else {
         count = obj->size >> PAGE_SHIFT;
     }
 
     ret = sg_alloc_table(sgt, count, GFP_KERNEL);
     if (ret)
         goto err_free;
 
     /* this must be after omap_gem_pin() to ensure we have pages attached */
     omap_gem_dma_sync_buffer(obj, dir);
 
     if (addr) {
         for_each_sg(sgt->sgl, sg, count, i) {
             sg_set_page(sg, phys_to_page(addr), len,
                 offset_in_page(addr));
             sg_dma_address(sg) = addr;
             sg_dma_len(sg) = len;
 
             addr += stride;
         }
     } else {
         for_each_sg(sgt->sgl, sg, count, i) {
             sg_set_page(sg, omap_obj->pages[i], PAGE_SIZE, 0);
             sg_dma_address(sg) = omap_obj->dma_addrs[i];
             sg_dma_len(sg) =  PAGE_SIZE;
         }
     }
 
     omap_obj->sgt = sgt;
 out:
     mutex_unlock(&omap_obj->lock);
     return sgt;
 
 err_free:
     kfree(sgt);
 err_unpin:
     mutex_unlock(&omap_obj->lock);
     omap_gem_unpin(obj);
     return ERR_PTR(ret);
 }
 
 void omap_gem_put_sg(struct drm_gem_object *obj, struct sg_table *sgt)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
 
     if (WARN_ON(omap_obj->sgt != sgt))
         return;
 
     omap_gem_unpin(obj);
 }
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 /*
  * Get kernel virtual address for CPU access.. this more or less only
  * exists for omap_fbdev.
  */
 void *omap_gem_vaddr(struct drm_gem_object *obj)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     void *vaddr;
     int ret;
 
     mutex_lock(&omap_obj->lock);
 
     if (!omap_obj->vaddr) {
         ret = omap_gem_attach_pages(obj);
         if (ret) {
             vaddr = ERR_PTR(ret);
             goto unlock;
         }
 
         omap_obj->vaddr = vmap(omap_obj->pages, obj->size >> PAGE_SHIFT,
                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
     }
 
     vaddr = omap_obj->vaddr;
 
 unlock:
     mutex_unlock(&omap_obj->lock);
     return vaddr;
 }
 #endif
 
 /* -----------------------------------------------------------------------------
  * Power Management
  */
 
 #ifdef CONFIG_PM
 /* re-pin objects in DMM in resume path: */
 int omap_gem_resume(struct drm_device *dev)
 {
     struct omap_drm_private *priv = dev->dev_private;
     struct omap_gem_object *omap_obj;
     int ret = 0;
 
     mutex_lock(&priv->list_lock);
     list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
         if (omap_obj->block) {
             struct drm_gem_object *obj = &omap_obj->base;
             u32 npages = obj->size >> PAGE_SHIFT;
 
             WARN_ON(!omap_obj->pages);  /* this can't happen */
             ret = tiler_pin(omap_obj->block,
                     omap_obj->pages, npages,
                     omap_obj->roll, true);
             if (ret) {
                 dev_err(dev->dev, "could not repin: %d\n", ret);
                 goto done;
             }
         }
     }
 
 done:
     mutex_unlock(&priv->list_lock);
     return ret;
 }
 #endif
 
 /* -----------------------------------------------------------------------------
  * DebugFS
  */
 
 #ifdef CONFIG_DEBUG_FS
 void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 {
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
     u64 off;
 
     off = drm_vma_node_start(&obj->vma_node);
 
     mutex_lock(&omap_obj->lock);
 
     seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
             omap_obj->flags, obj->name, kref_read(&obj->refcount),
             off, &omap_obj->dma_addr,
             refcount_read(&omap_obj->pin_cnt),
             omap_obj->vaddr, omap_obj->roll);
 
     if (omap_obj->flags & OMAP_BO_TILED_MASK) {
         seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
         if (omap_obj->block) {
             struct tcm_area *area = &omap_obj->block->area;
             seq_printf(m, " (%dx%d, %dx%d)",
                     area->p0.x, area->p0.y,
                     area->p1.x, area->p1.y);
         }
     } else {
         seq_printf(m, " %zu", obj->size);
     }
 
     mutex_unlock(&omap_obj->lock);
 
     seq_printf(m, "\n");
 }
 
 void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
 {
     struct omap_gem_object *omap_obj;
     int count = 0;
     size_t size = 0;
 
     list_for_each_entry(omap_obj, list, mm_list) {
         struct drm_gem_object *obj = &omap_obj->base;
         seq_printf(m, "   ");
         omap_gem_describe(obj, m);
         count++;
         size += obj->size;
     }
 
     seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 }
 #endif
 
 /* -----------------------------------------------------------------------------
  * Constructor & Destructor
  */
 
 static void omap_gem_free_object(struct drm_gem_object *obj)
 {
     struct drm_device *dev = obj->dev;
     struct omap_drm_private *priv = dev->dev_private;
     struct omap_gem_object *omap_obj = to_omap_bo(obj);
 
     omap_gem_evict(obj);
 
     mutex_lock(&priv->list_lock);
     list_del(&omap_obj->mm_list);
     mutex_unlock(&priv->list_lock);
 
     /*
      * We own the sole reference to the object at this point, but to keep
      * lockdep happy, we must still take the omap_obj_lock to call
      * omap_gem_detach_pages(). This should hardly make any difference as
      * there can't be any lock contention.
      */
     mutex_lock(&omap_obj->lock);
 
     /* The object should not be pinned. */
     WARN_ON(refcount_read(&omap_obj->pin_cnt) > 0);
 
     if (omap_obj->pages) {
         if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
             kfree(omap_obj->pages);
         else
             omap_gem_detach_pages(obj);
     }
 
     if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
         dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
                 omap_obj->dma_addr);
     } else if (omap_obj->vaddr) {
         vunmap(omap_obj->vaddr);
     } else if (obj->import_attach) {
         drm_prime_gem_destroy(obj, omap_obj->sgt);
     }
 
     mutex_unlock(&omap_obj->lock);
 
     drm_gem_object_release(obj);
 
     mutex_destroy(&omap_obj->lock);
 
     kfree(omap_obj);
 }
 
 static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
 {
     struct omap_drm_private *priv = dev->dev_private;
 
     switch (flags & OMAP_BO_CACHE_MASK) {
     case OMAP_BO_CACHED:
     case OMAP_BO_WC:
     case OMAP_BO_CACHE_MASK:
         break;
 
     default:
         return false;
     }
 
     if (flags & OMAP_BO_TILED_MASK) {
         if (!priv->usergart)
             return false;
 
         switch (flags & OMAP_BO_TILED_MASK) {
         case OMAP_BO_TILED_8:
         case OMAP_BO_TILED_16:
         case OMAP_BO_TILED_32:
             break;
 
         default:
             return false;
         }
     }
 
     return true;
 }
 
 static const struct vm_operations_struct omap_gem_vm_ops = {
     .fault = omap_gem_fault,
     .open = drm_gem_vm_open,
     .close = drm_gem_vm_close,
 };
 
 static const struct drm_gem_object_funcs omap_gem_object_funcs = {
     .free = omap_gem_free_object,
     .export = omap_gem_prime_export,
     .vm_ops = &omap_gem_vm_ops,
 };
 
 /* GEM buffer object constructor */
 struct drm_gem_object *omap_gem_new(struct drm_device *dev,
         union omap_gem_size gsize, u32 flags)
 {
     struct omap_drm_private *priv = dev->dev_private;
     struct omap_gem_object *omap_obj;
     struct drm_gem_object *obj;
     struct address_space *mapping;
     size_t size;
     int ret;
 
     if (!omap_gem_validate_flags(dev, flags))
         return NULL;
 
     /* Validate the flags and compute the memory and cache flags. */
     if (flags & OMAP_BO_TILED_MASK) {
         /*
          * Tiled buffers are always shmem paged backed. When they are
          * scanned out, they are remapped into DMM/TILER.
          */
         flags |= OMAP_BO_MEM_SHMEM;
 
         /*
          * Currently don't allow cached buffers. There is some caching
          * stuff that needs to be handled better.
          */
         flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
         flags |= tiler_get_cpu_cache_flags();
     } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
         /*
          * If we don't have DMM, we must allocate scanout buffers
          * from contiguous DMA memory.
          */
         flags |= OMAP_BO_MEM_DMA_API;
     } else if (!(flags & OMAP_BO_MEM_DMABUF)) {
         /*
          * All other buffers not backed by dma_buf are shmem-backed.
          */
         flags |= OMAP_BO_MEM_SHMEM;
     }
 
     /* Allocate the initialize the OMAP GEM object. */
     omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
     if (!omap_obj)
         return NULL;
 
     obj = &omap_obj->base;
     omap_obj->flags = flags;
     mutex_init(&omap_obj->lock);
 
     if (flags & OMAP_BO_TILED_MASK) {
         /*
          * For tiled buffers align dimensions to slot boundaries and
          * calculate size based on aligned dimensions.
          */
         tiler_align(gem2fmt(flags), &gsize.tiled.width,
                 &gsize.tiled.height);
 
         size = tiler_size(gem2fmt(flags), gsize.tiled.width,
                   gsize.tiled.height);
 
         omap_obj->width = gsize.tiled.width;
         omap_obj->height = gsize.tiled.height;
     } else {
         size = PAGE_ALIGN(gsize.bytes);
     }
 
     obj->funcs = &omap_gem_object_funcs;
 
     /* Initialize the GEM object. */
     if (!(flags & OMAP_BO_MEM_SHMEM)) {
         drm_gem_private_object_init(dev, obj, size);
     } else {
         ret = drm_gem_object_init(dev, obj, size);
         if (ret)
             goto err_free;
 
         mapping = obj->filp->f_mapping;
         mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
     }
 
     /* Allocate memory if needed. */
     if (flags & OMAP_BO_MEM_DMA_API) {
         omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
                            &omap_obj->dma_addr,
                            GFP_KERNEL);
         if (!omap_obj->vaddr)
             goto err_release;
     }
 
     mutex_lock(&priv->list_lock);
     list_add(&omap_obj->mm_list, &priv->obj_list);
     mutex_unlock(&priv->list_lock);
 
     return obj;
 
 err_release:
     drm_gem_object_release(obj);
 err_free:
     kfree(omap_obj);
     return NULL;
 }
 
 struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
                        struct sg_table *sgt)
 {
     struct omap_drm_private *priv = dev->dev_private;
     struct omap_gem_object *omap_obj;
     struct drm_gem_object *obj;
     union omap_gem_size gsize;
 
     /* Without a DMM only physically contiguous buffers can be supported. */
     if (sgt->orig_nents != 1 && !priv->has_dmm)
         return ERR_PTR(-EINVAL);
 
     gsize.bytes = PAGE_ALIGN(size);
     obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
     if (!obj)
         return ERR_PTR(-ENOMEM);
 
     omap_obj = to_omap_bo(obj);
 
     mutex_lock(&omap_obj->lock);
 
     omap_obj->sgt = sgt;
 
     if (sgt->orig_nents == 1) {
         omap_obj->dma_addr = sg_dma_address(sgt->sgl);
     } else {
         /* Create pages list from sgt */
         struct page **pages;
         unsigned int npages;
         unsigned int ret;
 
         npages = DIV_ROUND_UP(size, PAGE_SIZE);
         pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
         if (!pages) {
             omap_gem_free_object(obj);
             obj = ERR_PTR(-ENOMEM);
             goto done;
         }
 
         omap_obj->pages = pages;
         ret = drm_prime_sg_to_page_array(sgt, pages, npages);
         if (ret) {
             omap_gem_free_object(obj);
             obj = ERR_PTR(-ENOMEM);
             goto done;
         }
     }
 
 done:
     mutex_unlock(&omap_obj->lock);
     return obj;
 }
 
 /* convenience method to construct a GEM buffer object, and userspace handle */
 int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
         union omap_gem_size gsize, u32 flags, u32 *handle)
 {
     struct drm_gem_object *obj;
     int ret;
 
     obj = omap_gem_new(dev, gsize, flags);
     if (!obj)
         return -ENOMEM;
 
     ret = drm_gem_handle_create(file, obj, handle);
     if (ret) {
         omap_gem_free_object(obj);
         return ret;
     }
 
     /* drop reference from allocate - handle holds it now */
     drm_gem_object_put(obj);
 
     return 0;
 }
 
 /* -----------------------------------------------------------------------------
  * Init & Cleanup
  */
 
 /* If DMM is used, we need to set some stuff up.. */
 void omap_gem_init(struct drm_device *dev)
 {
     struct omap_drm_private *priv = dev->dev_private;
     struct omap_drm_usergart *usergart;
     const enum tiler_fmt fmts[] = {
             TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
     };
     int i, j;
 
     if (!dmm_is_available()) {
         /* DMM only supported on OMAP4 and later, so this isn't fatal */
         dev_warn(dev->dev, "DMM not available, disable DMM support\n");
         return;
     }
 
     usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
     if (!usergart)
         return;
 
     /* reserve 4k aligned/wide regions for userspace mappings: */
     for (i = 0; i < ARRAY_SIZE(fmts); i++) {
         u16 h = 1, w = PAGE_SIZE >> i;
 
         tiler_align(fmts[i], &w, &h);
         /* note: since each region is 1 4kb page wide, and minimum
          * number of rows, the height ends up being the same as the
          * # of pages in the region
          */
         usergart[i].height = h;
         usergart[i].height_shift = ilog2(h);
         usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
         usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
         for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
             struct omap_drm_usergart_entry *entry;
             struct tiler_block *block;
 
             entry = &usergart[i].entry[j];
             block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
             if (IS_ERR(block)) {
                 dev_err(dev->dev,
                         "reserve failed: %d, %d, %ld\n",
                         i, j, PTR_ERR(block));
                 return;
             }
             entry->dma_addr = tiler_ssptr(block);
             entry->block = block;
 
             DBG("%d:%d: %dx%d: dma_addr=%pad stride=%d", i, j, w, h,
                     &entry->dma_addr,
                     usergart[i].stride_pfn << PAGE_SHIFT);
         }
     }
 
     priv->usergart = usergart;
     priv->has_dmm = true;
 }
 
 void omap_gem_deinit(struct drm_device *dev)
 {
     struct omap_drm_private *priv = dev->dev_private;
 
     /* I believe we can rely on there being no more outstanding GEM
      * objects which could depend on usergart/dmm at this point.
      */
     kfree(priv->usergart);
 }

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