Lines Matching refs:dma
16 #include "dma.h"
67 void dma_region_init(struct dma_region *dma)
69 dma->kvirt = NULL;
70 dma->dev = NULL;
71 dma->n_pages = 0;
72 dma->n_dma_pages = 0;
73 dma->sglist = NULL;
79 int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
87 dma->n_pages = n_bytes >> PAGE_SHIFT;
89 dma->kvirt = vmalloc_32(n_bytes);
90 if (!dma->kvirt) {
96 memset(dma->kvirt, 0, n_bytes);
99 dma->sglist = vmalloc(dma->n_pages * sizeof(*dma->sglist));
100 if (!dma->sglist) {
105 sg_init_table(dma->sglist, dma->n_pages);
108 for (i = 0; i < dma->n_pages; i++) {
110 (unsigned long)dma->kvirt + (i << PAGE_SHIFT);
112 sg_set_page(&dma->sglist[i], vmalloc_to_page((void *)va),
117 dma->n_dma_pages =
118 pci_map_sg(dev, dma->sglist, dma->n_pages, direction);
120 if (dma->n_dma_pages == 0) {
125 dma->dev = dev;
126 dma->direction = direction;
131 dma_region_free(dma);
138 void dma_region_free(struct dma_region *dma)
140 if (dma->n_dma_pages) {
141 pci_unmap_sg(dma->dev, dma->sglist, dma->n_pages,
142 dma->direction);
143 dma->n_dma_pages = 0;
144 dma->dev = NULL;
147 vfree(dma->sglist);
148 dma->sglist = NULL;
150 vfree(dma->kvirt);
151 dma->kvirt = NULL;
152 dma->n_pages = 0;
157 static inline int dma_region_find(struct dma_region *dma, unsigned long offset,
163 for (i = start; i < dma->n_dma_pages; i++) {
164 if (off < sg_dma_len(&dma->sglist[i])) {
169 off -= sg_dma_len(&dma->sglist[i]);
172 BUG_ON(i >= dma->n_dma_pages);
181 * the beginning of the @dma.
183 dma_addr_t dma_region_offset_to_bus(struct dma_region * dma,
189 &dma->sglist[dma_region_find(dma, offset, 0, &rem)];
196 void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
205 first = dma_region_find(dma, offset, 0, &rem);
206 last = dma_region_find(dma, rem + len - 1, first, &rem);
208 pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1,
209 dma->direction);
215 void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
224 first = dma_region_find(dma, offset, 0, &rem);
225 last = dma_region_find(dma, rem + len - 1, first, &rem);
227 pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first],
228 last - first + 1, dma->direction);
236 struct dma_region *dma = (struct dma_region *)vma->vm_private_data;
238 if (!dma->kvirt)
241 if (vmf->pgoff >= dma->n_pages)
244 vmf->page = vmalloc_to_page(dma->kvirt + (vmf->pgoff << PAGE_SHIFT));
256 int dma_region_mmap(struct dma_region *dma, struct file *file,
261 if (!dma->kvirt)
269 if (size > (dma->n_pages << PAGE_SHIFT))
273 vma->vm_private_data = dma;
282 int dma_region_mmap(struct dma_region *dma, struct file *file,