diff options
Diffstat (limited to 'drivers/gpu/drm/udl/udl_gem.c')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_gem.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c new file mode 100644 index 000000000000..852642dc1187 --- /dev/null +++ b/drivers/gpu/drm/udl/udl_gem.c @@ -0,0 +1,227 @@ +/* + * Copyright (C) 2012 Red Hat + * + * This file is subject to the terms and conditions of the GNU General Public + * License v2. See the file COPYING in the main directory of this archive for + * more details. + */ + +#include "drmP.h" +#include "udl_drv.h" +#include <linux/shmem_fs.h> + +struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev, + size_t size) +{ + struct udl_gem_object *obj; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (obj == NULL) + return NULL; + + if (drm_gem_object_init(dev, &obj->base, size) != 0) { + kfree(obj); + return NULL; + } + + return obj; +} + +static int +udl_gem_create(struct drm_file *file, + struct drm_device *dev, + uint64_t size, + uint32_t *handle_p) +{ + struct udl_gem_object *obj; + int ret; + u32 handle; + + size = roundup(size, PAGE_SIZE); + + obj = udl_gem_alloc_object(dev, size); + if (obj == NULL) + return -ENOMEM; + + ret = drm_gem_handle_create(file, &obj->base, &handle); + if (ret) { + drm_gem_object_release(&obj->base); + kfree(obj); + return ret; + } + + drm_gem_object_unreference(&obj->base); + *handle_p = handle; + return 0; +} + +int udl_dumb_create(struct drm_file *file, + struct drm_device *dev, + struct drm_mode_create_dumb *args) +{ + args->pitch = args->width * ((args->bpp + 1) / 8); + args->size = args->pitch * args->height; + return udl_gem_create(file, dev, + args->size, &args->handle); +} + +int udl_dumb_destroy(struct drm_file *file, struct drm_device *dev, + uint32_t handle) +{ + return drm_gem_handle_delete(file, handle); +} + +int udl_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data); + struct page *page; + unsigned int page_offset; + int ret = 0; + + page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> + PAGE_SHIFT; + + if (!obj->pages) + return VM_FAULT_SIGBUS; + + page = obj->pages[page_offset]; + ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page); + switch (ret) { + case -EAGAIN: + set_need_resched(); + case 0: + case -ERESTARTSYS: + return VM_FAULT_NOPAGE; + case -ENOMEM: + return VM_FAULT_OOM; + default: + return VM_FAULT_SIGBUS; + } +} + +int udl_gem_init_object(struct drm_gem_object *obj) +{ + BUG(); + + return 0; +} + +static int udl_gem_get_pages(struct udl_gem_object *obj, gfp_t gfpmask) +{ + int page_count, i; + struct page *page; + struct inode *inode; + struct address_space *mapping; + + if (obj->pages) + return 0; + + page_count = obj->base.size / PAGE_SIZE; + BUG_ON(obj->pages != NULL); + obj->pages = drm_malloc_ab(page_count, sizeof(struct page *)); + if (obj->pages == NULL) + return -ENOMEM; + + inode = obj->base.filp->f_path.dentry->d_inode; + mapping = inode->i_mapping; + gfpmask |= mapping_gfp_mask(mapping); + + for (i = 0; i < page_count; i++) { + page = shmem_read_mapping_page_gfp(mapping, i, gfpmask); + if (IS_ERR(page)) + goto err_pages; + obj->pages[i] = page; + } + + return 0; +err_pages: + while (i--) + page_cache_release(obj->pages[i]); + drm_free_large(obj->pages); + obj->pages = NULL; + return PTR_ERR(page); +} + +static void udl_gem_put_pages(struct udl_gem_object *obj) +{ + int page_count = obj->base.size / PAGE_SIZE; + int i; + + for (i = 0; i < page_count; i++) + page_cache_release(obj->pages[i]); + + drm_free_large(obj->pages); + obj->pages = NULL; +} + +int udl_gem_vmap(struct udl_gem_object *obj) +{ + int page_count = obj->base.size / PAGE_SIZE; + int ret; + + ret = udl_gem_get_pages(obj, GFP_KERNEL); + if (ret) + return ret; + + obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL); + if (!obj->vmapping) + return -ENOMEM; + return 0; +} + +void udl_gem_vunmap(struct udl_gem_object *obj) +{ + if (obj->vmapping) + vunmap(obj->vmapping); + + udl_gem_put_pages(obj); +} + +void udl_gem_free_object(struct drm_gem_object *gem_obj) +{ + struct udl_gem_object *obj = to_udl_bo(gem_obj); + + if (obj->vmapping) + udl_gem_vunmap(obj); + + if (obj->pages) + udl_gem_put_pages(obj); + + if (gem_obj->map_list.map) + drm_gem_free_mmap_offset(gem_obj); +} + +/* the dumb interface doesn't work with the GEM straight MMAP + interface, it expects to do MMAP on the drm fd, like normal */ +int udl_gem_mmap(struct drm_file *file, struct drm_device *dev, + uint32_t handle, uint64_t *offset) +{ + struct udl_gem_object *gobj; + struct drm_gem_object *obj; + int ret = 0; + + mutex_lock(&dev->struct_mutex); + obj = drm_gem_object_lookup(dev, file, handle); + if (obj == NULL) { + ret = -ENOENT; + goto unlock; + } + gobj = to_udl_bo(obj); + + ret = udl_gem_get_pages(gobj, GFP_KERNEL); + if (ret) + return ret; + if (!gobj->base.map_list.map) { + ret = drm_gem_create_mmap_offset(obj); + if (ret) + goto out; + } + + *offset = (u64)gobj->base.map_list.hash.key << PAGE_SHIFT; + +out: + drm_gem_object_unreference(&gobj->base); +unlock: + mutex_unlock(&dev->struct_mutex); + return ret; +} |