2 * Copyright (C) 2012 Red Hat
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License v2. See the file COPYING in the main directory of this archive for
11 #include <linux/shmem_fs.h>
12 #include <linux/dma-buf.h>
14 struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
17 struct udl_gem_object *obj;
19 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
23 if (drm_gem_object_init(dev, &obj->base, size) != 0) {
32 udl_gem_create(struct drm_file *file,
33 struct drm_device *dev,
37 struct udl_gem_object *obj;
41 size = roundup(size, PAGE_SIZE);
43 obj = udl_gem_alloc_object(dev, size);
47 ret = drm_gem_handle_create(file, &obj->base, &handle);
49 drm_gem_object_release(&obj->base);
54 drm_gem_object_unreference(&obj->base);
59 int udl_dumb_create(struct drm_file *file,
60 struct drm_device *dev,
61 struct drm_mode_create_dumb *args)
63 args->pitch = args->width * ((args->bpp + 1) / 8);
64 args->size = args->pitch * args->height;
65 return udl_gem_create(file, dev,
66 args->size, &args->handle);
69 int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
73 ret = drm_gem_mmap(filp, vma);
77 vma->vm_flags &= ~VM_PFNMAP;
78 vma->vm_flags |= VM_MIXEDMAP;
83 int udl_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
85 struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
87 unsigned int page_offset;
90 page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
94 return VM_FAULT_SIGBUS;
96 page = obj->pages[page_offset];
97 ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
102 return VM_FAULT_NOPAGE;
106 return VM_FAULT_SIGBUS;
110 static int udl_gem_get_pages(struct udl_gem_object *obj, gfp_t gfpmask)
117 pages = drm_gem_get_pages(&obj->base, gfpmask);
119 return PTR_ERR(pages);
126 static void udl_gem_put_pages(struct udl_gem_object *obj)
128 if (obj->base.import_attach) {
129 drm_free_large(obj->pages);
134 drm_gem_put_pages(&obj->base, obj->pages, false, false);
138 int udl_gem_vmap(struct udl_gem_object *obj)
140 int page_count = obj->base.size / PAGE_SIZE;
143 if (obj->base.import_attach) {
144 obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
150 ret = udl_gem_get_pages(obj, GFP_KERNEL);
154 obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
160 void udl_gem_vunmap(struct udl_gem_object *obj)
162 if (obj->base.import_attach) {
163 dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
168 vunmap(obj->vmapping);
170 udl_gem_put_pages(obj);
173 void udl_gem_free_object(struct drm_gem_object *gem_obj)
175 struct udl_gem_object *obj = to_udl_bo(gem_obj);
180 if (gem_obj->import_attach) {
181 drm_prime_gem_destroy(gem_obj, obj->sg);
182 put_device(gem_obj->dev->dev);
186 udl_gem_put_pages(obj);
188 drm_gem_free_mmap_offset(gem_obj);
191 /* the dumb interface doesn't work with the GEM straight MMAP
192 interface, it expects to do MMAP on the drm fd, like normal */
193 int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
194 uint32_t handle, uint64_t *offset)
196 struct udl_gem_object *gobj;
197 struct drm_gem_object *obj;
200 mutex_lock(&dev->struct_mutex);
201 obj = drm_gem_object_lookup(dev, file, handle);
206 gobj = to_udl_bo(obj);
208 ret = udl_gem_get_pages(gobj, GFP_KERNEL);
211 ret = drm_gem_create_mmap_offset(obj);
215 *offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
218 drm_gem_object_unreference(&gobj->base);
220 mutex_unlock(&dev->struct_mutex);
224 static int udl_prime_create(struct drm_device *dev,
227 struct udl_gem_object **obj_p)
229 struct udl_gem_object *obj;
232 npages = size / PAGE_SIZE;
235 obj = udl_gem_alloc_object(dev, npages * PAGE_SIZE);
240 obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
241 if (obj->pages == NULL) {
242 DRM_ERROR("obj pages is NULL %d\n", npages);
246 drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, npages);
252 struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
253 struct dma_buf *dma_buf)
255 struct dma_buf_attachment *attach;
257 struct udl_gem_object *uobj;
261 get_device(dev->dev);
262 attach = dma_buf_attach(dma_buf, dev->dev);
263 if (IS_ERR(attach)) {
264 put_device(dev->dev);
265 return ERR_CAST(attach);
268 get_dma_buf(dma_buf);
270 sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
276 ret = udl_prime_create(dev, dma_buf->size, sg, &uobj);
281 uobj->base.import_attach = attach;
286 dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
288 dma_buf_detach(dma_buf, attach);
289 dma_buf_put(dma_buf);
290 put_device(dev->dev);