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-rw-r--r--drivers/ieee1394/dma.c289
1 files changed, 0 insertions, 289 deletions
diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
deleted file mode 100644
index d178699b194a..000000000000
--- a/drivers/ieee1394/dma.c
+++ /dev/null
@@ -1,289 +0,0 @@
1/*
2 * DMA region bookkeeping routines
3 *
4 * Copyright (C) 2002 Maas Digital LLC
5 *
6 * This code is licensed under the GPL. See the file COPYING in the root
7 * directory of the kernel sources for details.
8 */
9
10#include <linux/mm.h>
11#include <linux/module.h>
12#include <linux/pci.h>
13#include <linux/vmalloc.h>
14#include <linux/scatterlist.h>
15
16#include "dma.h"
17
18/* dma_prog_region */
19
20void dma_prog_region_init(struct dma_prog_region *prog)
21{
22 prog->kvirt = NULL;
23 prog->dev = NULL;
24 prog->n_pages = 0;
25 prog->bus_addr = 0;
26}
27
28int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
29 struct pci_dev *dev)
30{
31 /* round up to page size */
32 n_bytes = PAGE_ALIGN(n_bytes);
33
34 prog->n_pages = n_bytes >> PAGE_SHIFT;
35
36 prog->kvirt = pci_alloc_consistent(dev, n_bytes, &prog->bus_addr);
37 if (!prog->kvirt) {
38 printk(KERN_ERR
39 "dma_prog_region_alloc: pci_alloc_consistent() failed\n");
40 dma_prog_region_free(prog);
41 return -ENOMEM;
42 }
43
44 prog->dev = dev;
45
46 return 0;
47}
48
49void dma_prog_region_free(struct dma_prog_region *prog)
50{
51 if (prog->kvirt) {
52 pci_free_consistent(prog->dev, prog->n_pages << PAGE_SHIFT,
53 prog->kvirt, prog->bus_addr);
54 }
55
56 prog->kvirt = NULL;
57 prog->dev = NULL;
58 prog->n_pages = 0;
59 prog->bus_addr = 0;
60}
61
62/* dma_region */
63
64/**
65 * dma_region_init - clear out all fields but do not allocate anything
66 */
67void dma_region_init(struct dma_region *dma)
68{
69 dma->kvirt = NULL;
70 dma->dev = NULL;
71 dma->n_pages = 0;
72 dma->n_dma_pages = 0;
73 dma->sglist = NULL;
74}
75
76/**
77 * dma_region_alloc - allocate the buffer and map it to the IOMMU
78 */
79int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
80 struct pci_dev *dev, int direction)
81{
82 unsigned int i;
83
84 /* round up to page size */
85 n_bytes = PAGE_ALIGN(n_bytes);
86
87 dma->n_pages = n_bytes >> PAGE_SHIFT;
88
89 dma->kvirt = vmalloc_32(n_bytes);
90 if (!dma->kvirt) {
91 printk(KERN_ERR "dma_region_alloc: vmalloc_32() failed\n");
92 goto err;
93 }
94
95 /* Clear the ram out, no junk to the user */
96 memset(dma->kvirt, 0, n_bytes);
97
98 /* allocate scatter/gather list */
99 dma->sglist = vmalloc(dma->n_pages * sizeof(*dma->sglist));
100 if (!dma->sglist) {
101 printk(KERN_ERR "dma_region_alloc: vmalloc(sglist) failed\n");
102 goto err;
103 }
104
105 sg_init_table(dma->sglist, dma->n_pages);
106
107 /* fill scatter/gather list with pages */
108 for (i = 0; i < dma->n_pages; i++) {
109 unsigned long va =
110 (unsigned long)dma->kvirt + (i << PAGE_SHIFT);
111
112 sg_set_page(&dma->sglist[i], vmalloc_to_page((void *)va),
113 PAGE_SIZE, 0);
114 }
115
116 /* map sglist to the IOMMU */
117 dma->n_dma_pages =
118 pci_map_sg(dev, dma->sglist, dma->n_pages, direction);
119
120 if (dma->n_dma_pages == 0) {
121 printk(KERN_ERR "dma_region_alloc: pci_map_sg() failed\n");
122 goto err;
123 }
124
125 dma->dev = dev;
126 dma->direction = direction;
127
128 return 0;
129
130 err:
131 dma_region_free(dma);
132 return -ENOMEM;
133}
134
135/**
136 * dma_region_free - unmap and free the buffer
137 */
138void dma_region_free(struct dma_region *dma)
139{
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;
145 }
146
147 vfree(dma->sglist);
148 dma->sglist = NULL;
149
150 vfree(dma->kvirt);
151 dma->kvirt = NULL;
152 dma->n_pages = 0;
153}
154
155/* find the scatterlist index and remaining offset corresponding to a
156 given offset from the beginning of the buffer */
157static inline int dma_region_find(struct dma_region *dma, unsigned long offset,
158 unsigned int start, unsigned long *rem)
159{
160 int i;
161 unsigned long off = offset;
162
163 for (i = start; i < dma->n_dma_pages; i++) {
164 if (off < sg_dma_len(&dma->sglist[i])) {
165 *rem = off;
166 break;
167 }
168
169 off -= sg_dma_len(&dma->sglist[i]);
170 }
171
172 BUG_ON(i >= dma->n_dma_pages);
173
174 return i;
175}
176
177/**
178 * dma_region_offset_to_bus - get bus address of an offset within a DMA region
179 *
180 * Returns the DMA bus address of the byte with the given @offset relative to
181 * the beginning of the @dma.
182 */
183dma_addr_t dma_region_offset_to_bus(struct dma_region * dma,
184 unsigned long offset)
185{
186 unsigned long rem = 0;
187
188 struct scatterlist *sg =
189 &dma->sglist[dma_region_find(dma, offset, 0, &rem)];
190 return sg_dma_address(sg) + rem;
191}
192
193/**
194 * dma_region_sync_for_cpu - sync the CPU's view of the buffer
195 */
196void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
197 unsigned long len)
198{
199 int first, last;
200 unsigned long rem = 0;
201
202 if (!len)
203 len = 1;
204
205 first = dma_region_find(dma, offset, 0, &rem);
206 last = dma_region_find(dma, rem + len - 1, first, &rem);
207
208 pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1,
209 dma->direction);
210}
211
212/**
213 * dma_region_sync_for_device - sync the IO bus' view of the buffer
214 */
215void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
216 unsigned long len)
217{
218 int first, last;
219 unsigned long rem = 0;
220
221 if (!len)
222 len = 1;
223
224 first = dma_region_find(dma, offset, 0, &rem);
225 last = dma_region_find(dma, rem + len - 1, first, &rem);
226
227 pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first],
228 last - first + 1, dma->direction);
229}
230
231#ifdef CONFIG_MMU
232
233static int dma_region_pagefault(struct vm_area_struct *vma,
234 struct vm_fault *vmf)
235{
236 struct dma_region *dma = (struct dma_region *)vma->vm_private_data;
237
238 if (!dma->kvirt)
239 return VM_FAULT_SIGBUS;
240
241 if (vmf->pgoff >= dma->n_pages)
242 return VM_FAULT_SIGBUS;
243
244 vmf->page = vmalloc_to_page(dma->kvirt + (vmf->pgoff << PAGE_SHIFT));
245 get_page(vmf->page);
246 return 0;
247}
248
249static const struct vm_operations_struct dma_region_vm_ops = {
250 .fault = dma_region_pagefault,
251};
252
253/**
254 * dma_region_mmap - map the buffer into a user space process
255 */
256int dma_region_mmap(struct dma_region *dma, struct file *file,
257 struct vm_area_struct *vma)
258{
259 unsigned long size;
260
261 if (!dma->kvirt)
262 return -EINVAL;
263
264 /* must be page-aligned (XXX: comment is wrong, we could allow pgoff) */
265 if (vma->vm_pgoff != 0)
266 return -EINVAL;
267
268 /* check the length */
269 size = vma->vm_end - vma->vm_start;
270 if (size > (dma->n_pages << PAGE_SHIFT))
271 return -EINVAL;
272
273 vma->vm_ops = &dma_region_vm_ops;
274 vma->vm_private_data = dma;
275 vma->vm_file = file;
276 vma->vm_flags |= VM_RESERVED | VM_ALWAYSDUMP;
277
278 return 0;
279}
280
281#else /* CONFIG_MMU */
282
283int dma_region_mmap(struct dma_region *dma, struct file *file,
284 struct vm_area_struct *vma)
285{
286 return -EINVAL;
287}
288
289#endif /* CONFIG_MMU */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-30 10:19:27 -0500