diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_gem.c')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_gem.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_gem.c b/drivers/gpu/drm/vkms/vkms_gem.c new file mode 100644 index 000000000000..c7e38368602b --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_gem.c @@ -0,0 +1,179 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/shmem_fs.h> + +#include "vkms_drv.h" + +static struct vkms_gem_object *__vkms_gem_create(struct drm_device *dev, + u64 size) +{ + struct vkms_gem_object *obj; + int ret; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return ERR_PTR(-ENOMEM); + + size = roundup(size, PAGE_SIZE); + ret = drm_gem_object_init(dev, &obj->gem, size); + if (ret) { + kfree(obj); + return ERR_PTR(ret); + } + + mutex_init(&obj->pages_lock); + + return obj; +} + +void vkms_gem_free_object(struct drm_gem_object *obj) +{ + struct vkms_gem_object *gem = container_of(obj, struct vkms_gem_object, + gem); + + kvfree(gem->pages); + mutex_destroy(&gem->pages_lock); + drm_gem_object_release(obj); + kfree(gem); +} + +int vkms_gem_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct vkms_gem_object *obj = vma->vm_private_data; + unsigned long vaddr = vmf->address; + pgoff_t page_offset; + loff_t num_pages; + int ret; + + page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT; + num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE); + + if (page_offset > num_pages) + return VM_FAULT_SIGBUS; + + ret = -ENOENT; + mutex_lock(&obj->pages_lock); + if (obj->pages) { + get_page(obj->pages[page_offset]); + vmf->page = obj->pages[page_offset]; + ret = 0; + } + mutex_unlock(&obj->pages_lock); + if (ret) { + struct page *page; + struct address_space *mapping; + + mapping = file_inode(obj->gem.filp)->i_mapping; + page = shmem_read_mapping_page(mapping, page_offset); + + if (!IS_ERR(page)) { + vmf->page = page; + ret = 0; + } else { + switch (PTR_ERR(page)) { + case -ENOSPC: + case -ENOMEM: + ret = VM_FAULT_OOM; + break; + case -EBUSY: + ret = VM_FAULT_RETRY; + break; + case -EFAULT: + case -EINVAL: + ret = VM_FAULT_SIGBUS; + break; + default: + WARN_ON(PTR_ERR(page)); + ret = VM_FAULT_SIGBUS; + break; + } + } + } + return ret; +} + +struct drm_gem_object *vkms_gem_create(struct drm_device *dev, + struct drm_file *file, + u32 *handle, + u64 size) +{ + struct vkms_gem_object *obj; + int ret; + + if (!file || !dev || !handle) + return ERR_PTR(-EINVAL); + + obj = __vkms_gem_create(dev, size); + if (IS_ERR(obj)) + return ERR_CAST(obj); + + ret = drm_gem_handle_create(file, &obj->gem, handle); + drm_gem_object_put_unlocked(&obj->gem); + if (ret) { + drm_gem_object_release(&obj->gem); + kfree(obj); + return ERR_PTR(ret); + } + + return &obj->gem; +} + +int vkms_dumb_create(struct drm_file *file, struct drm_device *dev, + struct drm_mode_create_dumb *args) +{ + struct drm_gem_object *gem_obj; + u64 pitch, size; + + if (!args || !dev || !file) + return -EINVAL; + + pitch = args->width * DIV_ROUND_UP(args->bpp, 8); + size = pitch * args->height; + + if (!size) + return -EINVAL; + + gem_obj = vkms_gem_create(dev, file, &args->handle, size); + if (IS_ERR(gem_obj)) + return PTR_ERR(gem_obj); + + args->size = gem_obj->size; + args->pitch = pitch; + + DRM_DEBUG_DRIVER("Created object of size %lld\n", size); + + return 0; +} + +int vkms_dumb_map(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset) +{ + struct drm_gem_object *obj; + int ret; + + obj = drm_gem_object_lookup(file, handle); + if (!obj) + return -ENOENT; + + if (!obj->filp) { + ret = -EINVAL; + goto unref; + } + + ret = drm_gem_create_mmap_offset(obj); + if (ret) + goto unref; + + *offset = drm_vma_node_offset_addr(&obj->vma_node); +unref: + drm_gem_object_put_unlocked(obj); + + return ret; +} |