common/videobuf2/frame_vector.c

18  * @vec:	structure which receives pages / pfns of the addresses mapped.
21  * This function maps virtual addresses from @start and fills @vec structure
41 		     struct frame_vector *vec)
49 	if (WARN_ON_ONCE(nr_frames > vec->nr_allocated))
50 		nr_frames = vec->nr_allocated;
58 				  (struct page **)(vec->ptrs));
59 	vec->got_ref = true;
60 	vec->is_pfns = false;
61 	vec->nr_frames = ret;
66 	vec->nr_frames = 0;
74  * @vec:	frame vector to put
80 void put_vaddr_frames(struct frame_vector *vec)
84 	if (!vec->got_ref)
86 	pages = frame_vector_pages(vec);
89 	 * get_vaddr_frames() got pages but vec was later converted to pfns.
95 	unpin_user_pages(pages, vec->nr_frames);
96 	vec->got_ref = false;
98 	vec->nr_frames = 0;
104  * @vec:	frame vector to convert
106  * Convert @vec to contain array of page pointers.  If the conversion is
110 int frame_vector_to_pages(struct frame_vector *vec)
116 	if (!vec->is_pfns)
118 	nums = frame_vector_pfns(vec);
119 	for (i = 0; i < vec->nr_frames; i++)
123 	for (i = 0; i < vec->nr_frames; i++)
125 	vec->is_pfns = false;
132  * @vec:	frame vector to convert
134  * Convert @vec to contain array of pfns.
136 void frame_vector_to_pfns(struct frame_vector *vec)
142 	if (vec->is_pfns)
144 	pages = (struct page **)(vec->ptrs);
146 	for (i = 0; i < vec->nr_frames; i++)
148 	vec->is_pfns = true;
161 	struct frame_vector *vec;
162 	int size = struct_size(vec, ptrs, nr_frames);
176 	vec = kvmalloc(size, GFP_KERNEL);
177 	if (!vec)
179 	vec->nr_allocated = nr_frames;
180 	vec->nr_frames = 0;
181 	return vec;
187  * @vec:	Frame vector to free
191 void frame_vector_destroy(struct frame_vector *vec)
194 	VM_BUG_ON(vec->nr_frames > 0);
195 	kvfree(vec);