diff options
Diffstat (limited to 'drivers/staging/omapdrm')
| -rw-r--r-- | drivers/staging/omapdrm/TODO | 5 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_drv.c | 6 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_drv.h | 3 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_fb.c | 2 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_gem.c | 432 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_gem_helpers.c | 55 |
6 files changed, 466 insertions, 37 deletions
diff --git a/drivers/staging/omapdrm/TODO b/drivers/staging/omapdrm/TODO index 18677e777368..55b18377ac4f 100644 --- a/drivers/staging/omapdrm/TODO +++ b/drivers/staging/omapdrm/TODO @@ -22,6 +22,11 @@ TODO . Review DSS vs KMS mismatches. The omap_dss_device is sort of part encoder, part connector. Which results in a bit of duct tape to fwd calls from encoder to connector. Possibly this could be done a bit better. +. Solve PM sequencing on resume. DMM/TILER must be reloaded before any + access is made from any component in the system. Which means on suspend + CRTC's should be disabled, and on resume the LUT should be reprogrammed + before CRTC's are re-enabled, to prevent DSS from trying to DMA from a + buffer mapped in DMM/TILER before LUT is reloaded. . Add debugfs information for DMM/TILER Userspace: diff --git a/drivers/staging/omapdrm/omap_drv.c b/drivers/staging/omapdrm/omap_drv.c index 71de7cf34d89..7ecf578f5526 100644 --- a/drivers/staging/omapdrm/omap_drv.c +++ b/drivers/staging/omapdrm/omap_drv.c @@ -509,7 +509,7 @@ static int ioctl_gem_info(struct drm_device *dev, void *data, return -ENOENT; } - args->size = obj->size; /* for now */ + args->size = omap_gem_mmap_size(obj); args->offset = omap_gem_mmap_offset(obj); drm_gem_object_unreference_unlocked(obj); @@ -557,6 +557,8 @@ static int dev_load(struct drm_device *dev, unsigned long flags) dev->dev_private = priv; + omap_gem_init(dev); + ret = omap_modeset_init(dev); if (ret) { dev_err(dev->dev, "omap_modeset_init failed: ret=%d\n", ret); @@ -589,8 +591,8 @@ static int dev_unload(struct drm_device *dev) drm_kms_helper_poll_fini(dev); omap_fbdev_free(dev); - omap_modeset_free(dev); + omap_gem_deinit(dev); kfree(dev->dev_private); dev->dev_private = NULL; diff --git a/drivers/staging/omapdrm/omap_drv.h b/drivers/staging/omapdrm/omap_drv.h index c8f2752a4f18..9d0783d8c6be 100644 --- a/drivers/staging/omapdrm/omap_drv.h +++ b/drivers/staging/omapdrm/omap_drv.h @@ -84,6 +84,8 @@ struct drm_connector *omap_framebuffer_get_next_connector( void omap_framebuffer_flush(struct drm_framebuffer *fb, int x, int y, int w, int h); +void omap_gem_init(struct drm_device *dev); +void omap_gem_deinit(struct drm_device *dev); struct drm_gem_object *omap_gem_new(struct drm_device *dev, union omap_gem_size gsize, uint32_t flags); @@ -109,6 +111,7 @@ int omap_gem_get_paddr(struct drm_gem_object *obj, dma_addr_t *paddr, bool remap); int omap_gem_put_paddr(struct drm_gem_object *obj); uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj); +size_t omap_gem_mmap_size(struct drm_gem_object *obj); static inline int align_pitch(int pitch, int width, int bpp) { diff --git a/drivers/staging/omapdrm/omap_fb.c b/drivers/staging/omapdrm/omap_fb.c index 82ed6120b0d3..491be5395d85 100644 --- a/drivers/staging/omapdrm/omap_fb.c +++ b/drivers/staging/omapdrm/omap_fb.c @@ -102,7 +102,7 @@ int omap_framebuffer_get_buffer(struct drm_framebuffer *fb, int x, int y, * dma_alloc_coherent()). But this should be ok because it * is only used by legacy fbdev */ - BUG_ON(!bo_vaddr); + BUG_ON(IS_ERR_OR_NULL(bo_vaddr)); *vaddr = bo_vaddr + offset; } diff --git a/drivers/staging/omapdrm/omap_gem.c b/drivers/staging/omapdrm/omap_gem.c index bc1709c7a286..1054da3b2d25 100644 --- a/drivers/staging/omapdrm/omap_gem.c +++ b/drivers/staging/omapdrm/omap_gem.c @@ -22,11 +22,13 @@ #include <linux/shmem_fs.h> #include "omap_drv.h" +#include "omap_dmm_tiler.h" /* remove these once drm core helpers are merged */ struct page ** _drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask); void _drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, bool dirty, bool accessed); +int _drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size); /* * GEM buffer object implementation. @@ -45,9 +47,16 @@ struct omap_gem_object { uint32_t flags; + /** width/height for tiled formats (rounded up to slot boundaries) */ + uint16_t width, height; + /** * If buffer is allocated physically contiguous, the OMAP_BO_DMA flag - * is set and the paddr is valid. + * is set and the paddr is valid. Also if the buffer is remapped in + * TILER and paddr_cnt > 0, then paddr is valid. But if you are using + * the physical address and OMAP_BO_DMA is not set, then you should + * be going thru omap_gem_{get,put}_paddr() to ensure the mapping is + * not removed from under your feet. * * Note that OMAP_BO_SCANOUT is a hint from userspace that DMA capable * buffer is requested, but doesn't mean that it is. Use the @@ -57,6 +66,16 @@ struct omap_gem_object { dma_addr_t paddr; /** + * # of users of paddr + */ + uint32_t paddr_cnt; + + /** + * 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 */ @@ -91,6 +110,67 @@ struct omap_gem_object { } *sync; }; +/* 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 usergart_entry { + struct tiler_block *block; /* the reserved tiler block */ + dma_addr_t paddr; + struct drm_gem_object *obj; /* the current pinned obj */ + pgoff_t obj_pgoff; /* page offset of obj currently + mapped in */ +}; +static struct { + struct 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 */ +} *usergart; + +static void evict_entry(struct drm_gem_object *obj, + enum tiler_fmt fmt, struct usergart_entry *entry) +{ + if (obj->dev->dev_mapping) { + size_t size = PAGE_SIZE * usergart[fmt].height; + loff_t off = omap_gem_mmap_offset(obj) + + (entry->obj_pgoff << PAGE_SHIFT); + unmap_mapping_range(obj->dev->dev_mapping, off, size, 1); + } + + entry->obj = NULL; +} + +/* Evict a buffer from usergart, if it is mapped there */ +static void evict(struct drm_gem_object *obj) +{ + struct omap_gem_object *omap_obj = to_omap_bo(obj); + + if (omap_obj->flags & OMAP_BO_TILED) { + enum tiler_fmt fmt = gem2fmt(omap_obj->flags); + int i; + + if (!usergart) + return; + + for (i = 0; i < NUM_USERGART_ENTRIES; i++) { + struct usergart_entry *entry = &usergart[fmt].entry[i]; + if (entry->obj == obj) + evict_entry(obj, fmt, entry); + } + } +} + /* GEM objects can either be allocated from contiguous memory (in which * case obj->filp==NULL), or w/ shmem backing (obj->filp!=NULL). But non * contiguous buffers can be remapped in TILER/DMM if they need to be @@ -142,7 +222,9 @@ uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj) { if (!obj->map_list.map) { /* Make it mmapable */ - int ret = drm_gem_create_mmap_offset(obj); + size_t size = omap_gem_mmap_size(obj); + int ret = _drm_gem_create_mmap_offset_size(obj, size); + if (ret) { dev_err(obj->dev->dev, "could not allocate mmap offset"); return 0; @@ -152,6 +234,134 @@ uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj) return (uint64_t)obj->map_list.hash.key << PAGE_SHIFT; } +/** 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) { + /* 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; +} + + +/* Normal handling for the case of faulting in non-tiled buffers */ +static int 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 = ((unsigned long)vmf->virtual_address - + vma->vm_start) >> PAGE_SHIFT; + + if (omap_obj->pages) { + pfn = page_to_pfn(omap_obj->pages[pgoff]); + } else { + BUG_ON(!(omap_obj->flags & OMAP_BO_DMA)); + pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff; + } + + VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, + pfn, pfn << PAGE_SHIFT); + + return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn); +} + +/* Special handling for the case of faulting in 2d tiled buffers */ +static int 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 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; + void __user *vaddr; + int i, ret, slots; + + if (!usergart) + return -EFAULT; + + /* TODO: this fxn might need a bit tweaking to deal w/ tiled buffers + * that are wider than 4kb + */ + + /* We don't use vmf->pgoff since that has the fake offset: */ + pgoff = ((unsigned long)vmf->virtual_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, usergart[fmt].height); + vaddr = vmf->virtual_address - ((pgoff - base_pgoff) << PAGE_SHIFT); + entry = &usergart[fmt].entry[usergart[fmt].last]; + + slots = omap_obj->width >> usergart[fmt].slot_shift; + + /* evict previous buffer using this usergart entry, if any: */ + if (entry->obj) + 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 >> usergart[fmt].height_shift) * slots; + + /* map in pages. 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 height is 64, then 64 pages fill a 4kb wide by 64 row region. + * 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 *) * (usergart[fmt].height - slots)); + + ret = tiler_pin(entry->block, pages, true); + if (ret) { + dev_err(obj->dev->dev, "failed to pin: %d\n", ret); + return ret; + } + + i = usergart[fmt].height; + pfn = entry->paddr >> PAGE_SHIFT; + + VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, + pfn, pfn << PAGE_SHIFT); + + while (i--) { + vm_insert_mixed(vma, (unsigned long)vaddr, pfn); + pfn += usergart[fmt].stride_pfn; + vaddr += PAGE_SIZE; + } + + /* simple round-robin: */ + usergart[fmt].last = (usergart[fmt].last + 1) % NUM_USERGART_ENTRIES; + + return 0; +} + /** * omap_gem_fault - pagefault handler for GEM objects * @vma: the VMA of the GEM object @@ -171,8 +381,6 @@ int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) struct omap_gem_object *omap_obj = to_omap_bo(obj); struct drm_device *dev = obj->dev; struct page **pages; - unsigned long pfn; - pgoff_t pgoff; int ret; /* Make sure we don't parallel update on a fault, nor move or remove @@ -192,21 +400,11 @@ int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) * probably trigger put_pages()? */ - /* We don't use vmf->pgoff since that has the fake offset: */ - pgoff = ((unsigned long)vmf->virtual_address - - vma->vm_start) >> PAGE_SHIFT; + if (omap_obj->flags & OMAP_BO_TILED) + ret = fault_2d(obj, vma, vmf); + else + ret = fault_1d(obj, vma, vmf); - if (omap_obj->pages) { - pfn = page_to_pfn(omap_obj->pages[pgoff]); - } else { - BUG_ON(!(omap_obj->flags & OMAP_BO_DMA)); - pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff; - } - - VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, - pfn, pfn << PAGE_SHIFT); - - ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn); fail: mutex_unlock(&dev->struct_mutex); @@ -308,8 +506,6 @@ int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, struct drm_gem_object *obj; int ret = 0; - mutex_lock(&dev->struct_mutex); - /* GEM does all our handle to object mapping */ obj = drm_gem_object_lookup(dev, file, handle); if (obj == NULL) { @@ -322,7 +518,6 @@ int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, drm_gem_object_unreference_unlocked(obj); fail: - mutex_unlock(&dev->struct_mutex); return ret; } @@ -336,12 +531,61 @@ int omap_gem_get_paddr(struct drm_gem_object *obj, struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret = 0; - if (is_shmem(obj)) { - /* TODO: remap to TILER */ - return -ENOMEM; + mutex_lock(&obj->dev->struct_mutex); + + if (remap && is_shmem(obj)) { + if (omap_obj->paddr_cnt == 0) { + struct page **pages; + enum tiler_fmt fmt = gem2fmt(omap_obj->flags); + struct tiler_block *block; + BUG_ON(omap_obj->block); + + ret = get_pages(obj, &pages); + if (ret) + goto fail; + + + if (omap_obj->flags & OMAP_BO_TILED) { + block = tiler_reserve_2d(fmt, + omap_obj->width, + omap_obj->height, 0); + } 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, pages, true); + if (ret) { + tiler_release(block); + dev_err(obj->dev->dev, + "could not pin: %d\n", ret); + goto fail; + } + + omap_obj->paddr = tiler_ssptr(block); + omap_obj->block = block; + + DBG("got paddr: %08x", omap_obj->paddr); + } + + omap_obj->paddr_cnt++; + + *paddr = omap_obj->paddr; + } else if (omap_obj->flags & OMAP_BO_DMA) { + *paddr = omap_obj->paddr; + } else { + ret = -EINVAL; } - *paddr = omap_obj->paddr; +fail: + mutex_unlock(&obj->dev->struct_mutex); return ret; } @@ -351,8 +595,30 @@ int omap_gem_get_paddr(struct drm_gem_object *obj, */ int omap_gem_put_paddr(struct drm_gem_object *obj) { - /* do something here when remap to TILER is used.. */ - return 0; + struct omap_gem_object *omap_obj = to_omap_bo(obj); + int ret = 0; + + mutex_lock(&obj->dev->struct_mutex); + if (omap_obj->paddr_cnt > 0) { + omap_obj->paddr_cnt--; + if (omap_obj->paddr_cnt == 0) { + ret = tiler_unpin(omap_obj->block); + if (ret) { + dev_err(obj->dev->dev, + "could not unpin pages: %d\n", ret); + goto fail; + } + ret = tiler_release(omap_obj->block); + if (ret) { + dev_err(obj->dev->dev, + "could not release unmap: %d\n", ret); + } + omap_obj->block = NULL; + } + } +fail: + mutex_unlock(&obj->dev->struct_mutex); + return ret; } /* acquire pages when needed (for example, for DMA where physically @@ -396,13 +662,22 @@ int omap_gem_put_pages(struct drm_gem_object *obj) return 0; } -/* Get kernel virtual address for CPU access.. only buffers that are - * allocated contiguously have a kernel virtual address, so this more - * or less only exists for omap_fbdev +/* Get kernel virtual address for CPU access.. this more or less only + * exists for omap_fbdev. This should be called with struct_mutex + * held. */ void *omap_gem_vaddr(struct drm_gem_object *obj) { struct omap_gem_object *omap_obj = to_omap_bo(obj); + WARN_ON(! mutex_is_locked(&obj->dev->struct_mutex)); + if (!omap_obj->vaddr) { + struct page **pages; + int ret = get_pages(obj, &pages); + if (ret) + return ERR_PTR(ret); + omap_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT, + VM_MAP, pgprot_writecombine(PAGE_KERNEL)); + } return omap_obj->vaddr; } @@ -670,6 +945,8 @@ void omap_gem_free_object(struct drm_gem_object *obj) struct drm_device *dev = obj->dev; struct omap_gem_object *omap_obj = to_omap_bo(obj); + evict(obj); + if (obj->map_list.map) { drm_gem_free_mmap_offset(obj); } @@ -682,6 +959,8 @@ void omap_gem_free_object(struct drm_gem_object *obj) if (!is_shmem(obj)) { dma_free_writecombine(dev->dev, obj->size, omap_obj->vaddr, omap_obj->paddr); + } else if (omap_obj->vaddr) { + vunmap(omap_obj->vaddr); } } @@ -729,11 +1008,32 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev, int ret; if (flags & OMAP_BO_TILED) { - /* TODO: not implemented yet */ - goto fail; - } + if (!usergart) { + dev_err(dev->dev, "Tiled buffers require DMM\n"); + goto fail; + } + + /* tiled buffers are always shmem paged backed.. when they are + * scanned out, they are remapped into DMM/TILER + */ + flags &= ~OMAP_BO_SCANOUT; + + /* currently don't allow cached buffers.. there is some caching + * stuff that needs to be handled better + */ + flags &= ~(OMAP_BO_CACHED|OMAP_BO_UNCACHED); + flags |= OMAP_BO_WC; - size = PAGE_ALIGN(gsize.bytes); + /* align dimensions to slot boundaries... */ + tiler_align(gem2fmt(flags), + &gsize.tiled.width, &gsize.tiled.height); + + /* ...and calculate size based on aligned dimensions */ + size = tiler_size(gem2fmt(flags), + gsize.tiled.width, gsize.tiled.height); + } else { + size = PAGE_ALIGN(gsize.bytes); + } omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL); if (!omap_obj) { @@ -754,6 +1054,11 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev, omap_obj->flags = flags; + if (flags & OMAP_BO_TILED) { + omap_obj->width = gsize.tiled.width; + omap_obj->height = gsize.tiled.height; + } + if (flags & (OMAP_BO_DMA|OMAP_BO_EXT_MEM)) { ret = drm_gem_private_object_init(dev, obj, size); } else { @@ -772,3 +1077,62 @@ fail: } return NULL; } + +/* init/cleanup.. if DMM is used, we need to set some stuff up.. */ +void omap_gem_init(struct drm_device *dev) +{ + const enum tiler_fmt fmts[] = { + TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT + }; + int i, j, ret; + + ret = omap_dmm_init(dev); + if (ret) { + /* DMM only supported on OMAP4 and later, so this isn't fatal */ + dev_warn(dev->dev, "omap_dmm_init failed, disabling DMM\n"); + return; + } + + usergart = kzalloc(3 * sizeof(*usergart), GFP_KERNEL); + + /* reserve 4k aligned/wide regions for userspace mappings: */ + for (i = 0; i < ARRAY_SIZE(fmts); i++) { + uint16_t 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]) >> PAGE_SHIFT; + usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i); + for (j = 0; j < NUM_USERGART_ENTRIES; j++) { + struct usergart_entry *entry = &usergart[i].entry[j]; + struct tiler_block *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->paddr = tiler_ssptr(block); + entry->block = block; + + DBG("%d:%d: %dx%d: paddr=%08x stride=%d", i, j, w, h, + entry->paddr, + usergart[i].stride_pfn << PAGE_SHIFT); + } + } +} + +void omap_gem_deinit(struct drm_device *dev) +{ + /* I believe we can rely on there being no more outstanding GEM + * objects which could depend on usergart/dmm at this point. + */ + omap_dmm_remove(); + kfree(usergart); +} diff --git a/drivers/staging/omapdrm/omap_gem_helpers.c b/drivers/staging/omapdrm/omap_gem_helpers.c index 1cfc12d35593..29275c7209e9 100644 --- a/drivers/staging/omapdrm/omap_gem_helpers.c +++ b/drivers/staging/omapdrm/omap_gem_helpers.c @@ -112,3 +112,58 @@ void _drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, drm_free_large(pages); } + +int +_drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size) +{ + struct drm_device *dev = obj->dev; + struct drm_gem_mm *mm = dev->mm_private; + struct drm_map_list *list; + struct drm_local_map *map; + int ret = 0; + + /* Set the object up for mmap'ing */ + list = &obj->map_list; + list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL); + if (!list->map) + return -ENOMEM; + + map = list->map; + map->type = _DRM_GEM; + map->size = size; + map->handle = obj; + + /* Get a DRM GEM mmap offset allocated... */ + list->file_offset_node = drm_mm_search_free(&mm->offset_manager, + size / PAGE_SIZE, 0, 0); + + if (!list->file_offset_node) { + DRM_ERROR("failed to allocate offset for bo %d\n", obj->name); + ret = -ENOSPC; + goto out_free_list; + } + + list->file_offset_node = drm_mm_get_block(list->file_offset_node, + size / PAGE_SIZE, 0); + if (!list->file_offset_node) { + ret = -ENOMEM; + goto out_free_list; + } + + list->hash.key = list->file_offset_node->start; + ret = drm_ht_insert_item(&mm->offset_hash, &list->hash); + if (ret) { + DRM_ERROR("failed to add to map hash\n"); + goto out_free_mm; + } + + return 0; + +out_free_mm: + drm_mm_put_block(list->file_offset_node); +out_free_list: + kfree(list->map); + list->map = NULL; + + return ret; +} |