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) {
28 obj->flags = UDL_BO_CACHEABLE;
33 udl_gem_create(struct drm_file *file,
34 struct drm_device *dev,
38 struct udl_gem_object *obj;
42 size = roundup(size, PAGE_SIZE);
44 obj = udl_gem_alloc_object(dev, size);
48 ret = drm_gem_handle_create(file, &obj->base, &handle);
50 drm_gem_object_release(&obj->base);
55 drm_gem_object_put_unlocked(&obj->base);
60 static void update_vm_cache_attr(struct udl_gem_object *obj,
61 struct vm_area_struct *vma)
63 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
65 /* non-cacheable as default. */
66 if (obj->flags & UDL_BO_CACHEABLE) {
67 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
68 } else if (obj->flags & UDL_BO_WC) {
70 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
73 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
77 int udl_dumb_create(struct drm_file *file,
78 struct drm_device *dev,
79 struct drm_mode_create_dumb *args)
81 args->pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
82 args->size = args->pitch * args->height;
83 return udl_gem_create(file, dev,
84 args->size, &args->handle);
87 int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
91 ret = drm_gem_mmap(filp, vma);
95 vma->vm_flags &= ~VM_PFNMAP;
96 vma->vm_flags |= VM_MIXEDMAP;
98 update_vm_cache_attr(to_udl_bo(vma->vm_private_data), vma);
103 vm_fault_t udl_gem_fault(struct vm_fault *vmf)
105 struct vm_area_struct *vma = vmf->vma;
106 struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
108 unsigned int page_offset;
110 page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
113 return VM_FAULT_SIGBUS;
115 page = obj->pages[page_offset];
116 return vmf_insert_page(vma, vmf->address, page);
119 int udl_gem_get_pages(struct udl_gem_object *obj)
126 pages = drm_gem_get_pages(&obj->base);
128 return PTR_ERR(pages);
135 void udl_gem_put_pages(struct udl_gem_object *obj)
137 if (obj->base.import_attach) {
143 drm_gem_put_pages(&obj->base, obj->pages, false, false);
147 int udl_gem_vmap(struct udl_gem_object *obj)
149 int page_count = obj->base.size / PAGE_SIZE;
152 if (obj->base.import_attach) {
153 obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
159 ret = udl_gem_get_pages(obj);
163 obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
169 void udl_gem_vunmap(struct udl_gem_object *obj)
171 if (obj->base.import_attach) {
172 dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
176 vunmap(obj->vmapping);
178 udl_gem_put_pages(obj);
181 void udl_gem_free_object(struct drm_gem_object *gem_obj)
183 struct udl_gem_object *obj = to_udl_bo(gem_obj);
188 if (gem_obj->import_attach) {
189 drm_prime_gem_destroy(gem_obj, obj->sg);
190 put_device(gem_obj->dev->dev);
194 udl_gem_put_pages(obj);
196 drm_gem_free_mmap_offset(gem_obj);
199 /* the dumb interface doesn't work with the GEM straight MMAP
200 interface, it expects to do MMAP on the drm fd, like normal */
201 int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
202 uint32_t handle, uint64_t *offset)
204 struct udl_gem_object *gobj;
205 struct drm_gem_object *obj;
206 struct udl_device *udl = to_udl(dev);
209 mutex_lock(&udl->gem_lock);
210 obj = drm_gem_object_lookup(file, handle);
215 gobj = to_udl_bo(obj);
217 ret = udl_gem_get_pages(gobj);
220 ret = drm_gem_create_mmap_offset(obj);
224 *offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
227 drm_gem_object_put_unlocked(&gobj->base);
229 mutex_unlock(&udl->gem_lock);