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_dumb_destroy(struct drm_file
*file
, struct drm_device
*dev
,
72 return drm_gem_handle_delete(file
, handle
);
75 int udl_drm_gem_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
79 ret
= drm_gem_mmap(filp
, vma
);
83 vma
->vm_flags
&= ~VM_PFNMAP
;
84 vma
->vm_flags
|= VM_MIXEDMAP
;
89 int udl_gem_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
91 struct udl_gem_object
*obj
= to_udl_bo(vma
->vm_private_data
);
93 unsigned int page_offset
;
96 page_offset
= ((unsigned long)vmf
->virtual_address
- vma
->vm_start
) >>
100 return VM_FAULT_SIGBUS
;
102 page
= obj
->pages
[page_offset
];
103 ret
= vm_insert_page(vma
, (unsigned long)vmf
->virtual_address
, page
);
109 return VM_FAULT_NOPAGE
;
113 return VM_FAULT_SIGBUS
;
117 int udl_gem_init_object(struct drm_gem_object
*obj
)
124 static int udl_gem_get_pages(struct udl_gem_object
*obj
, gfp_t gfpmask
)
129 struct address_space
*mapping
;
134 page_count
= obj
->base
.size
/ PAGE_SIZE
;
135 BUG_ON(obj
->pages
!= NULL
);
136 obj
->pages
= drm_malloc_ab(page_count
, sizeof(struct page
*));
137 if (obj
->pages
== NULL
)
140 inode
= obj
->base
.filp
->f_path
.dentry
->d_inode
;
141 mapping
= inode
->i_mapping
;
142 gfpmask
|= mapping_gfp_mask(mapping
);
144 for (i
= 0; i
< page_count
; i
++) {
145 page
= shmem_read_mapping_page_gfp(mapping
, i
, gfpmask
);
148 obj
->pages
[i
] = page
;
154 page_cache_release(obj
->pages
[i
]);
155 drm_free_large(obj
->pages
);
157 return PTR_ERR(page
);
160 static void udl_gem_put_pages(struct udl_gem_object
*obj
)
162 int page_count
= obj
->base
.size
/ PAGE_SIZE
;
165 if (obj
->base
.import_attach
) {
166 drm_free_large(obj
->pages
);
171 for (i
= 0; i
< page_count
; i
++)
172 page_cache_release(obj
->pages
[i
]);
174 drm_free_large(obj
->pages
);
178 int udl_gem_vmap(struct udl_gem_object
*obj
)
180 int page_count
= obj
->base
.size
/ PAGE_SIZE
;
183 if (obj
->base
.import_attach
) {
184 obj
->vmapping
= dma_buf_vmap(obj
->base
.import_attach
->dmabuf
);
190 ret
= udl_gem_get_pages(obj
, GFP_KERNEL
);
194 obj
->vmapping
= vmap(obj
->pages
, page_count
, 0, PAGE_KERNEL
);
200 void udl_gem_vunmap(struct udl_gem_object
*obj
)
202 if (obj
->base
.import_attach
) {
203 dma_buf_vunmap(obj
->base
.import_attach
->dmabuf
, obj
->vmapping
);
208 vunmap(obj
->vmapping
);
210 udl_gem_put_pages(obj
);
213 void udl_gem_free_object(struct drm_gem_object
*gem_obj
)
215 struct udl_gem_object
*obj
= to_udl_bo(gem_obj
);
220 if (gem_obj
->import_attach
)
221 drm_prime_gem_destroy(gem_obj
, obj
->sg
);
224 udl_gem_put_pages(obj
);
226 if (gem_obj
->map_list
.map
)
227 drm_gem_free_mmap_offset(gem_obj
);
230 /* the dumb interface doesn't work with the GEM straight MMAP
231 interface, it expects to do MMAP on the drm fd, like normal */
232 int udl_gem_mmap(struct drm_file
*file
, struct drm_device
*dev
,
233 uint32_t handle
, uint64_t *offset
)
235 struct udl_gem_object
*gobj
;
236 struct drm_gem_object
*obj
;
239 mutex_lock(&dev
->struct_mutex
);
240 obj
= drm_gem_object_lookup(dev
, file
, handle
);
245 gobj
= to_udl_bo(obj
);
247 ret
= udl_gem_get_pages(gobj
, GFP_KERNEL
);
250 if (!gobj
->base
.map_list
.map
) {
251 ret
= drm_gem_create_mmap_offset(obj
);
256 *offset
= (u64
)gobj
->base
.map_list
.hash
.key
<< PAGE_SHIFT
;
259 drm_gem_object_unreference(&gobj
->base
);
261 mutex_unlock(&dev
->struct_mutex
);
265 static int udl_prime_create(struct drm_device
*dev
,
268 struct udl_gem_object
**obj_p
)
270 struct udl_gem_object
*obj
;
273 npages
= size
/ PAGE_SIZE
;
276 obj
= udl_gem_alloc_object(dev
, npages
* PAGE_SIZE
);
281 obj
->pages
= drm_malloc_ab(npages
, sizeof(struct page
*));
282 if (obj
->pages
== NULL
) {
283 DRM_ERROR("obj pages is NULL %d\n", npages
);
287 drm_prime_sg_to_page_addr_arrays(sg
, obj
->pages
, NULL
, npages
);
293 struct drm_gem_object
*udl_gem_prime_import(struct drm_device
*dev
,
294 struct dma_buf
*dma_buf
)
296 struct dma_buf_attachment
*attach
;
298 struct udl_gem_object
*uobj
;
302 attach
= dma_buf_attach(dma_buf
, dev
->dev
);
304 return ERR_CAST(attach
);
306 sg
= dma_buf_map_attachment(attach
, DMA_BIDIRECTIONAL
);
312 ret
= udl_prime_create(dev
, dma_buf
->size
, sg
, &uobj
);
317 uobj
->base
.import_attach
= attach
;
322 dma_buf_unmap_attachment(attach
, sg
, DMA_BIDIRECTIONAL
);
324 dma_buf_detach(dma_buf
, attach
);
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