diff options
Diffstat (limited to 'linux-core/drm_ttm.c')
| -rw-r--r-- | linux-core/drm_ttm.c | 813 |
1 files changed, 813 insertions, 0 deletions
diff --git a/linux-core/drm_ttm.c b/linux-core/drm_ttm.c new file mode 100644 index 00000000..b3ea7c9b --- /dev/null +++ b/linux-core/drm_ttm.c @@ -0,0 +1,813 @@ +/************************************************************************** + * + * Copyright 2006 Tungsten Graphics, Inc., Steamboat Springs, CO. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * + **************************************************************************/ + +#include "drmP.h" +#include <asm/tlbflush.h> + +typedef struct p_mm_entry { + struct list_head head; + struct mm_struct *mm; + atomic_t refcount; +} p_mm_entry_t; + +typedef struct drm_val_action { + int needs_rx_flush; + int evicted_tt; + int evicted_vram; + int validated; +} drm_val_action_t; + +/* + * We may be manipulating other processes page tables, so for each TTM, keep track of + * which mm_structs are currently mapping the ttm so that we can take the appropriate + * locks when we modify their page tables. A typical application is when we evict another + * process' buffers. + */ + +int drm_ttm_add_mm_to_list(drm_ttm_t * ttm, struct mm_struct *mm) +{ + p_mm_entry_t *entry, *n_entry; + + list_for_each_entry(entry, &ttm->p_mm_list, head) { + if (mm == entry->mm) { + atomic_inc(&entry->refcount); + return 0; + } else if ((unsigned long)mm < (unsigned long)entry->mm) ; + } + + n_entry = drm_alloc(sizeof(*n_entry), DRM_MEM_MM); + if (!entry) { + DRM_ERROR("Allocation of process mm pointer entry failed\n"); + return -ENOMEM; + } + INIT_LIST_HEAD(&n_entry->head); + n_entry->mm = mm; + atomic_set(&n_entry->refcount, 0); + atomic_inc(&ttm->shared_count); + ttm->mm_list_seq++; + + list_add_tail(&n_entry->head, &entry->head); + + return 0; +} + +void drm_ttm_delete_mm(drm_ttm_t * ttm, struct mm_struct *mm) +{ + p_mm_entry_t *entry, *n; + list_for_each_entry_safe(entry, n, &ttm->p_mm_list, head) { + if (mm == entry->mm) { + if (atomic_add_negative(-1, &entry->refcount)) { + list_del(&entry->head); + drm_free(entry, sizeof(*entry), DRM_MEM_MM); + atomic_dec(&ttm->shared_count); + ttm->mm_list_seq++; + } + return; + } + } + BUG_ON(TRUE); +} + +static void drm_ttm_lock_mm(drm_ttm_t * ttm, int mm_sem, int page_table) +{ + p_mm_entry_t *entry; + + list_for_each_entry(entry, &ttm->p_mm_list, head) { + if (mm_sem) { + down_write(&entry->mm->mmap_sem); + } + if (page_table) { + spin_lock(&entry->mm->page_table_lock); + } + } +} + +static void drm_ttm_unlock_mm(drm_ttm_t * ttm, int mm_sem, int page_table) +{ + p_mm_entry_t *entry; + + list_for_each_entry(entry, &ttm->p_mm_list, head) { + if (page_table) { + spin_unlock(&entry->mm->page_table_lock); + } + if (mm_sem) { + up_write(&entry->mm->mmap_sem); + } + } +} + +static int ioremap_vmas(drm_ttm_t * ttm, unsigned long page_offset, + unsigned long num_pages, unsigned long aper_offset) +{ + struct list_head *list; + int ret = 0; + + list_for_each(list, &ttm->vma_list->head) { + drm_ttm_vma_list_t *entry = + list_entry(list, drm_ttm_vma_list_t, head); + + ret = io_remap_pfn_range(entry->vma, + entry->vma->vm_start + + (page_offset << PAGE_SHIFT), + (ttm->aperture_base >> PAGE_SHIFT) + + aper_offset, num_pages << PAGE_SHIFT, + drm_io_prot(_DRM_AGP, entry->vma)); + if (ret) + break; + } + global_flush_tlb(); + return ret; +} + +/* + * Unmap all vma pages from vmas mapping this ttm. + */ + +static int unmap_vma_pages(drm_ttm_t * ttm, unsigned long page_offset, + unsigned long num_pages) +{ + struct list_head *list; + struct page **first_page = ttm->pages + page_offset; + struct page **last_page = ttm->pages + (page_offset + num_pages); + struct page **cur_page; + + list_for_each(list, &ttm->vma_list->head) { + drm_ttm_vma_list_t *entry = + list_entry(list, drm_ttm_vma_list_t, head); + drm_clear_vma(entry->vma, + entry->vma->vm_start + + (page_offset << PAGE_SHIFT), + entry->vma->vm_start + + ((page_offset + num_pages) << PAGE_SHIFT)); + } + + for (cur_page = first_page; cur_page != last_page; ++cur_page) { + if (page_mapcount(*cur_page) != 0) { + DRM_ERROR("Mapped page detected. Map count is %d\n", + page_mapcount(*cur_page)); + return -1; + } + } + return 0; +} + +/* + * Free all resources associated with a ttm. + */ + +int drm_destroy_ttm(drm_ttm_t * ttm) +{ + + int i; + struct list_head *list, *next; + struct page **cur_page; + + if (!ttm) + return 0; + + if (atomic_read(&ttm->vma_count) > 0) { + DRM_DEBUG("VMAs are still alive. Skipping destruction.\n"); + return -EBUSY; + } else { + DRM_DEBUG("Checking for busy regions.\n"); + } + + if (ttm->be_list) { + list_for_each_safe(list, next, &ttm->be_list->head) { + drm_ttm_backend_list_t *entry = + list_entry(list, drm_ttm_backend_list_t, head); +#ifdef REMOVED + drm_ht_remove_item(&ttm->dev->ttmreghash, + &entry->hash); +#endif + drm_destroy_ttm_region(entry); + } + + drm_free(ttm->be_list, sizeof(*ttm->be_list), DRM_MEM_MAPS); + ttm->be_list = NULL; + } + + if (atomic_read(&ttm->unfinished_regions) > 0) { + DRM_DEBUG("Regions are still busy. Skipping destruction.\n"); + ttm->destroy = TRUE; + return -EAGAIN; + } else { + DRM_DEBUG("About to really destroy ttm.\n"); + } + + if (ttm->pages) { + for (i = 0; i < ttm->num_pages; ++i) { + cur_page = ttm->pages + i; + if (ttm->page_flags && + (ttm->page_flags[i] & DRM_TTM_PAGE_UNCACHED) && + *cur_page && !PageHighMem(*cur_page)) { + change_page_attr(*cur_page, 1, PAGE_KERNEL); + } + if (*cur_page) { + ClearPageReserved(*cur_page); + __free_page(*cur_page); + } + } + global_flush_tlb(); + vfree(ttm->pages); + ttm->pages = NULL; + } + if (ttm->page_flags) { + vfree(ttm->page_flags); + ttm->page_flags = NULL; + } + + if (ttm->vma_list) { + list_for_each_safe(list, next, &ttm->vma_list->head) { + drm_ttm_vma_list_t *entry = + list_entry(list, drm_ttm_vma_list_t, head); + list_del(list); + entry->vma->vm_private_data = NULL; + drm_free(entry, sizeof(*entry), DRM_MEM_MAPS); + } + drm_free(ttm->vma_list, sizeof(*ttm->vma_list), DRM_MEM_MAPS); + ttm->vma_list = NULL; + } + drm_free(ttm, sizeof(*ttm), DRM_MEM_MAPS); + + return 0; +} + +/* + * Initialize a ttm. + * FIXME: Avoid using vmalloc for the page- and page_flags tables? + */ + +drm_ttm_t *drm_init_ttm(struct drm_device * dev, unsigned long size) +{ + + drm_ttm_t *ttm; + + if (!dev->driver->bo_driver) + return NULL; + + ttm = drm_calloc(1, sizeof(*ttm), DRM_MEM_MAPS); + if (!ttm) + return NULL; + + ttm->lhandle = 0; + atomic_set(&ttm->vma_count, 0); + atomic_set(&ttm->unfinished_regions, 0); + ttm->destroy = FALSE; + ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; + + ttm->page_flags = vmalloc(ttm->num_pages * sizeof(*ttm->page_flags)); + if (!ttm->page_flags) { + drm_destroy_ttm(ttm); + DRM_ERROR("Failed allocating page_flags table\n"); + return NULL; + } + memset(ttm->page_flags, 0, ttm->num_pages * sizeof(*ttm->page_flags)); + + ttm->pages = vmalloc(ttm->num_pages * sizeof(*ttm->pages)); + if (!ttm->pages) { + drm_destroy_ttm(ttm); + DRM_ERROR("Failed allocating page table\n"); + return NULL; + } + memset(ttm->pages, 0, ttm->num_pages * sizeof(*ttm->pages)); + + ttm->be_list = drm_calloc(1, sizeof(*ttm->be_list), DRM_MEM_MAPS); + if (!ttm->be_list) { + DRM_ERROR("Alloc be regions failed\n"); + drm_destroy_ttm(ttm); + return NULL; + } + + INIT_LIST_HEAD(&ttm->be_list->head); + INIT_LIST_HEAD(&ttm->p_mm_list); + atomic_set(&ttm->shared_count, 0); + ttm->mm_list_seq = 0; + + ttm->vma_list = drm_calloc(1, sizeof(*ttm->vma_list), DRM_MEM_MAPS); + if (!ttm->vma_list) { + DRM_ERROR("Alloc vma list failed\n"); + drm_destroy_ttm(ttm); + return NULL; + } + + INIT_LIST_HEAD(&ttm->vma_list->head); + + ttm->lhandle = (unsigned long)ttm; + ttm->dev = dev; + return ttm; +} + +/* + * Lock the mmap_sems for processes that are mapping this ttm. + * This looks a bit clumsy, since we need to maintain the correct + * locking order + * mm->mmap_sem + * dev->struct_sem; + * and while we release dev->struct_sem to lock the mmap_sems, + * the mmap_sem list may have been updated. We need to revalidate + * it after relocking dev->struc_sem. + */ + +static int drm_ttm_lock_mmap_sem(drm_ttm_t * ttm) +{ + struct mm_struct **mm_list = NULL, **mm_list_p; + uint32_t list_seq; + uint32_t cur_count, shared_count; + p_mm_entry_t *entry; + unsigned i; + + cur_count = 0; + list_seq = ttm->mm_list_seq; + shared_count = atomic_read(&ttm->shared_count); + + do { + if (shared_count > cur_count) { + if (mm_list) + drm_free(mm_list, sizeof(*mm_list) * cur_count, + DRM_MEM_MM); + cur_count = shared_count + 10; + mm_list = + drm_alloc(sizeof(*mm_list) * cur_count, DRM_MEM_MM); + if (!mm_list) + return -ENOMEM; + } + + mm_list_p = mm_list; + list_for_each_entry(entry, &ttm->p_mm_list, head) { + *mm_list_p++ = entry->mm; + } + + mutex_unlock(&ttm->dev->struct_mutex); + mm_list_p = mm_list; + for (i = 0; i < shared_count; ++i, ++mm_list_p) { + down_write(&((*mm_list_p)->mmap_sem)); + } + + mutex_lock(&ttm->dev->struct_mutex); + + if (list_seq != ttm->mm_list_seq) { + mm_list_p = mm_list; + for (i = 0; i < shared_count; ++i, ++mm_list_p) { + up_write(&((*mm_list_p)->mmap_sem)); + } + + } + shared_count = atomic_read(&ttm->shared_count); + + } while (list_seq != ttm->mm_list_seq); + + if (mm_list) + drm_free(mm_list, sizeof(*mm_list) * cur_count, DRM_MEM_MM); + + ttm->mmap_sem_locked = TRUE; + return 0; +} + +/* + * Change caching policy for range of pages in a ttm. + */ + +static int drm_set_caching(drm_ttm_t * ttm, unsigned long page_offset, + unsigned long num_pages, int noncached, + int do_tlbflush) +{ + int i, cur; + struct page **cur_page; + pgprot_t attr = (noncached) ? PAGE_KERNEL_NOCACHE : PAGE_KERNEL; + + drm_ttm_lock_mm(ttm, FALSE, TRUE); + unmap_vma_pages(ttm, page_offset, num_pages); + + for (i = 0; i < num_pages; ++i) { + cur = page_offset + i; + cur_page = ttm->pages + cur; + if (*cur_page) { + if (PageHighMem(*cur_page)) { + if (noncached + && page_address(*cur_page) != NULL) { + DRM_ERROR + ("Illegal mapped HighMem Page\n"); + drm_ttm_unlock_mm(ttm, FALSE, TRUE); + return -EINVAL; + } + } else if ((ttm->page_flags[cur] & + DRM_TTM_PAGE_UNCACHED) != noncached) { + DRM_MASK_VAL(ttm->page_flags[cur], + DRM_TTM_PAGE_UNCACHED, noncached); + change_page_attr(*cur_page, 1, attr); + } + } + } + if (do_tlbflush) + global_flush_tlb(); + + drm_ttm_unlock_mm(ttm, FALSE, TRUE); + return 0; +} + + +/* + * Unbind a ttm region from the aperture. + */ + +int drm_evict_ttm_region(drm_ttm_backend_list_t * entry) +{ + drm_ttm_backend_t *be = entry->be; + drm_ttm_t *ttm = entry->owner; + int ret; + + if (be) { + switch (entry->state) { + case ttm_bound: + if (ttm && be->needs_cache_adjust(be)) { + ret = drm_ttm_lock_mmap_sem(ttm); + if (ret) + return ret; + drm_ttm_lock_mm(ttm, FALSE, TRUE); + unmap_vma_pages(ttm, entry->page_offset, + entry->num_pages); + global_flush_tlb(); + drm_ttm_unlock_mm(ttm, FALSE, TRUE); + } + be->unbind(entry->be); + if (ttm && be->needs_cache_adjust(be)) { + drm_set_caching(ttm, entry->page_offset, + entry->num_pages, 0, 1); + drm_ttm_unlock_mm(ttm, TRUE, FALSE); + } + break; + default: + break; + } + } + entry->state = ttm_evicted; + return 0; +} + +void drm_unbind_ttm_region(drm_ttm_backend_list_t * entry) +{ + drm_evict_ttm_region(entry); + entry->state = ttm_unbound; +} + +/* + * Destroy and clean up all resources associated with a ttm region. + * FIXME: release pages to OS when doing this operation. + */ + +void drm_destroy_ttm_region(drm_ttm_backend_list_t * entry) +{ + drm_ttm_backend_t *be = entry->be; + drm_ttm_t *ttm = entry->owner; + uint32_t *cur_page_flags; + int i; + + list_del_init(&entry->head); + + drm_unbind_ttm_region(entry); + if (be) { + be->clear(entry->be); + if (be->needs_cache_adjust(be)) { + int ret = drm_ttm_lock_mmap_sem(ttm); + drm_set_caching(ttm, entry->page_offset, + entry->num_pages, 0, 1); + if (!ret) + drm_ttm_unlock_mm(ttm, TRUE, FALSE); + } + be->destroy(be); + } + cur_page_flags = ttm->page_flags + entry->page_offset; + for (i = 0; i < entry->num_pages; ++i) { + DRM_MASK_VAL(*cur_page_flags, DRM_TTM_PAGE_USED, 0); + cur_page_flags++; + } + + drm_free(entry, sizeof(*entry), DRM_MEM_MAPS); +} + +/* + * Create a ttm region from a range of ttm pages. + */ + +int drm_create_ttm_region(drm_ttm_t * ttm, unsigned long page_offset, + unsigned long n_pages, int cached, + drm_ttm_backend_list_t ** region) +{ + struct page **cur_page; + uint32_t *cur_page_flags; + drm_ttm_backend_list_t *entry; + drm_ttm_backend_t *be; + int ret, i; + + if ((page_offset + n_pages) > ttm->num_pages || n_pages == 0) { + DRM_ERROR("Region Doesn't fit ttm\n"); + return -EINVAL; + } + + cur_page_flags = ttm->page_flags + page_offset; + for (i = 0; i < n_pages; ++i, ++cur_page_flags) { + if (*cur_page_flags & DRM_TTM_PAGE_USED) { + DRM_ERROR("TTM region overlap\n"); + return -EINVAL; + } else { + DRM_MASK_VAL(*cur_page_flags, DRM_TTM_PAGE_USED, + DRM_TTM_PAGE_USED); + } + } + + entry = drm_calloc(1, sizeof(*entry), DRM_MEM_MAPS); + if (!entry) + return -ENOMEM; + + be = ttm->dev->driver->bo_driver->create_ttm_backend_entry(ttm->dev, cached); + if (!be) { + drm_free(entry, sizeof(*entry), DRM_MEM_MAPS); + DRM_ERROR("Couldn't create backend.\n"); + return -EINVAL; + } + entry->state = ttm_unbound; + entry->page_offset = page_offset; + entry->num_pages = n_pages; + entry->be = be; + entry->owner = ttm; + + INIT_LIST_HEAD(&entry->head); + list_add_tail(&entry->head, &ttm->be_list->head); + + for (i = 0; i < entry->num_pages; ++i) { + cur_page = ttm->pages + (page_offset + i); + if (!*cur_page) { + *cur_page = alloc_page(GFP_KERNEL); + if (!*cur_page) { + DRM_ERROR("Page allocation failed\n"); + drm_destroy_ttm_region(entry); + return -ENOMEM; + } + SetPageReserved(*cur_page); + } + } + + if ((ret = be->populate(be, n_pages, ttm->pages + page_offset))) { + drm_destroy_ttm_region(entry); + DRM_ERROR("Couldn't populate backend.\n"); + return ret; + } + ttm->aperture_base = be->aperture_base; + + *region = entry; + return 0; +} + +/* + * Bind a ttm region. Set correct caching policy. + */ + +int drm_bind_ttm_region(drm_ttm_backend_list_t * region, + unsigned long aper_offset) +{ + + int i; + uint32_t *cur_page_flag; + int ret = 0; + drm_ttm_backend_t *be; + drm_ttm_t *ttm; + + if (!region || region->state == ttm_bound) + return -EINVAL; + + be = region->be; + ttm = region->owner; + + if (ttm && be->needs_cache_adjust(be)) { + ret = drm_ttm_lock_mmap_sem(ttm); + if (ret) + return ret; + drm_set_caching(ttm, region->page_offset, region->num_pages, + DRM_TTM_PAGE_UNCACHED, TRUE); + } else { + DRM_DEBUG("Binding cached\n"); + } + + if ((ret = be->bind(be, aper_offset))) { + if (ttm && be->needs_cache_adjust(be)) + drm_ttm_unlock_mm(ttm, TRUE, FALSE); + drm_unbind_ttm_region(region); + DRM_ERROR("Couldn't bind backend.\n"); + return ret; + } + + cur_page_flag = ttm->page_flags + region->page_offset; + for (i = 0; i < region->num_pages; ++i) { + DRM_MASK_VAL(*cur_page_flag, DRM_TTM_MASK_PFN, + (i + aper_offset) << PAGE_SHIFT); + cur_page_flag++; + } + + if (ttm && be->needs_cache_adjust(be)) { + ioremap_vmas(ttm, region->page_offset, region->num_pages, + aper_offset); + drm_ttm_unlock_mm(ttm, TRUE, FALSE); + } + + region->state = ttm_bound; + return 0; +} + +int drm_rebind_ttm_region(drm_ttm_backend_list_t * entry, + unsigned long aper_offset) +{ + return drm_bind_ttm_region(entry, aper_offset); + +} + +/* + * Destroy an anonymous ttm region. + */ + +void drm_user_destroy_region(drm_ttm_backend_list_t * entry) +{ + drm_ttm_backend_t *be; + struct page **cur_page; + int i; + + if (!entry || entry->owner) + return; + + be = entry->be; + if (!be) { + drm_free(entry, sizeof(*entry), DRM_MEM_MAPS); + return; + } + + be->unbind(be); + + if (entry->anon_pages) { + cur_page = entry->anon_pages; + for (i = 0; i < entry->anon_locked; ++i) { + if (!PageReserved(*cur_page)) + SetPageDirty(*cur_page); + page_cache_release(*cur_page); + cur_page++; + } + vfree(entry->anon_pages); + } + + be->destroy(be); + drm_free(entry, sizeof(*entry), DRM_MEM_MAPS); + return; +} + +/* + * Create a ttm region from an arbitrary region of user pages. + * Since this region has no backing ttm, it's owner is set to + * null, and it is registered with the file of the caller. + * Gets destroyed when the file is closed. We call this an + * anonymous ttm region. + */ + +int drm_user_create_region(drm_device_t * dev, unsigned long start, int len, + drm_ttm_backend_list_t ** entry) +{ + drm_ttm_backend_list_t *tmp; + drm_ttm_backend_t *be; + int ret; + + if (len <= 0) + return -EINVAL; + if (!dev->driver->bo_driver->create_ttm_backend_entry) + return -EFAULT; + + tmp = drm_calloc(1, sizeof(*tmp), DRM_MEM_MAPS); + + if (!tmp) + return -ENOMEM; + + be = dev->driver->bo_driver->create_ttm_backend_entry(dev, 1); + tmp->be = be; + + if (!be) { + drm_user_destroy_region(tmp); + return -ENOMEM; + } + if (be->needs_cache_adjust(be)) { + drm_user_destroy_region(tmp); + return -EFAULT; + } + + tmp->anon_pages = vmalloc(sizeof(*(tmp->anon_pages)) * len); + + if (!tmp->anon_pages) { + drm_user_destroy_region(tmp); + return -ENOMEM; + } + + down_read(¤t->mm->mmap_sem); + ret = get_user_pages(current, current->mm, start, len, 1, 0, + tmp->anon_pages, NULL); + up_read(¤t->mm->mmap_sem); + + if (ret != len) { + drm_user_destroy_region(tmp); + DRM_ERROR("Could not lock %d pages. Return code was %d\n", + len, ret); + return -EPERM; + } + tmp->anon_locked = len; + + ret = be->populate(be, len, tmp->anon_pages); + + if (ret) { + drm_user_destroy_region(tmp); + return ret; + } + + tmp->state = ttm_unbound; +#ifdef REMOVED + tmp->mm = &dev->driver->bo_driver->ttm_mm; +#endif + *entry = tmp; + + return 0; +} + +/* + * Create a ttm and add it to the drm book-keeping. + */ + +int drm_add_ttm(drm_device_t * dev, unsigned size, drm_map_list_t ** maplist) +{ + drm_map_list_t *list; + drm_map_t *map; + drm_ttm_t *ttm; + + map = drm_alloc(sizeof(*map), DRM_MEM_MAPS); + if (!map) + return -ENOMEM; + + ttm = drm_init_ttm(dev, size); + + if (!ttm) { + DRM_ERROR("Could not create ttm\n"); + drm_free(map, sizeof(*map), DRM_MEM_MAPS); + return -ENOMEM; + } + + map->offset = ttm->lhandle; + map->type = _DRM_TTM; + map->flags = _DRM_REMOVABLE; + map->size = size; + + list = drm_calloc(1, sizeof(*list), DRM_MEM_MAPS); + if (!list) { + drm_destroy_ttm(ttm); + drm_free(map, sizeof(*map), DRM_MEM_MAPS); + return -ENOMEM; + } + map->handle = (void *)list; + + +#ifdef REMOVED + if (drm_ht_just_insert_please(&dev->maphash, &list->hash, + (unsigned long) map->handle, + 32 - PAGE_SHIFT)) { + drm_destroy_ttm(ttm); + drm_free(map, sizeof(*map), DRM_MEM_MAPS); + drm_free(list, sizeof(*list), DRM_MEM_MAPS); + return -ENOMEM; + } +#endif + + list->user_token = + (list->hash.key << PAGE_SHIFT) + DRM_MAP_HASH_OFFSET; + list->map = map; + + *maplist = list; + + return 0; +} |