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-rw-r--r--arch/sparc64/kernel/iommu_common.c248
1 files changed, 0 insertions, 248 deletions
diff --git a/arch/sparc64/kernel/iommu_common.c b/arch/sparc64/kernel/iommu_common.c
deleted file mode 100644
index 72a4acfe8c7b..000000000000
--- a/arch/sparc64/kernel/iommu_common.c
+++ /dev/null
@@ -1,248 +0,0 @@
1/* $Id: iommu_common.c,v 1.9 2001/12/17 07:05:09 davem Exp $
2 * iommu_common.c: UltraSparc SBUS/PCI common iommu code.
3 *
4 * Copyright (C) 1999 David S. Miller (davem@redhat.com)
5 */
6
7#include <linux/dma-mapping.h>
8#include "iommu_common.h"
9
10/* You are _strongly_ advised to enable the following debugging code
11 * any time you make changes to the sg code below, run it for a while
12 * with filesystems mounted read-only before buying the farm... -DaveM
13 */
14
15#ifdef VERIFY_SG
16static int verify_lengths(struct scatterlist *sglist, int nents, int npages)
17{
18 int sg_len, dma_len;
19 int i, pgcount;
20 struct scatterlist *sg;
21
22 sg_len = 0;
23 for_each_sg(sglist, sg, nents, i)
24 sg_len += sg->length;
25
26 dma_len = 0;
27 for_each_sg(sglist, sg, nents, i) {
28 if (!sg->dma_length)
29 break;
30 dma_len += sg->dma_length;
31 }
32
33 if (sg_len != dma_len) {
34 printk("verify_lengths: Error, different, sg[%d] dma[%d]\n",
35 sg_len, dma_len);
36 return -1;
37 }
38
39 pgcount = 0;
40 for_each_sg(sglist, sg, nents, i) {
41 unsigned long start, end;
42
43 if (!sg->dma_length)
44 break;
45
46 start = sg->dma_address;
47 start = start & IO_PAGE_MASK;
48
49 end = sg->dma_address + sg->dma_length;
50 end = (end + (IO_PAGE_SIZE - 1)) & IO_PAGE_MASK;
51
52 pgcount += ((end - start) >> IO_PAGE_SHIFT);
53 }
54
55 if (pgcount != npages) {
56 printk("verify_lengths: Error, page count wrong, "
57 "npages[%d] pgcount[%d]\n",
58 npages, pgcount);
59 return -1;
60 }
61
62 /* This test passes... */
63 return 0;
64}
65
66static int verify_one_map(struct scatterlist *dma_sg, struct scatterlist **__sg, int nents, iopte_t **__iopte)
67{
68 struct scatterlist *sg = *__sg;
69 iopte_t *iopte = *__iopte;
70 u32 dlen = dma_sg->dma_length;
71 u32 daddr;
72 unsigned int sglen;
73 unsigned long sgaddr;
74
75 daddr = dma_sg->dma_address;
76 sglen = sg->length;
77 sgaddr = (unsigned long) sg_virt(sg);
78 while (dlen > 0) {
79 unsigned long paddr;
80
81 /* SG and DMA_SG must begin at the same sub-page boundary. */
82 if ((sgaddr & ~IO_PAGE_MASK) != (daddr & ~IO_PAGE_MASK)) {
83 printk("verify_one_map: Wrong start offset "
84 "sg[%08lx] dma[%08x]\n",
85 sgaddr, daddr);
86 nents = -1;
87 goto out;
88 }
89
90 /* Verify the IOPTE points to the right page. */
91 paddr = iopte_val(*iopte) & IOPTE_PAGE;
92 if ((paddr + PAGE_OFFSET) != (sgaddr & IO_PAGE_MASK)) {
93 printk("verify_one_map: IOPTE[%08lx] maps the "
94 "wrong page, should be [%08lx]\n",
95 iopte_val(*iopte), (sgaddr & IO_PAGE_MASK) - PAGE_OFFSET);
96 nents = -1;
97 goto out;
98 }
99
100 /* If this SG crosses a page, adjust to that next page
101 * boundary and loop.
102 */
103 if ((sgaddr & IO_PAGE_MASK) ^ ((sgaddr + sglen - 1) & IO_PAGE_MASK)) {
104 unsigned long next_page, diff;
105
106 next_page = (sgaddr + IO_PAGE_SIZE) & IO_PAGE_MASK;
107 diff = next_page - sgaddr;
108 sgaddr += diff;
109 daddr += diff;
110 sglen -= diff;
111 dlen -= diff;
112 if (dlen > 0)
113 iopte++;
114 continue;
115 }
116
117 /* SG wholly consumed within this page. */
118 daddr += sglen;
119 dlen -= sglen;
120
121 if (dlen > 0 && ((daddr & ~IO_PAGE_MASK) == 0))
122 iopte++;
123
124 sg = sg_next(sg);
125 if (--nents <= 0)
126 break;
127 sgaddr = (unsigned long) sg_virt(sg);
128 sglen = sg->length;
129 }
130 if (dlen < 0) {
131 /* Transfer overrun, big problems. */
132 printk("verify_one_map: Transfer overrun by %d bytes.\n",
133 -dlen);
134 nents = -1;
135 } else {
136 /* Advance to next dma_sg implies that the next iopte will
137 * begin it.
138 */
139 iopte++;
140 }
141
142out:
143 *__sg = sg;
144 *__iopte = iopte;
145 return nents;
146}
147
148static int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte)
149{
150 struct scatterlist *dma_sg = sg;
151 struct scatterlist *orig_dma_sg = dma_sg;
152 int orig_nents = nents;
153
154 for (;;) {
155 nents = verify_one_map(dma_sg, &sg, nents, &iopte);
156 if (nents <= 0)
157 break;
158 dma_sg = sg_next(dma_sg);
159 if (dma_sg->dma_length == 0)
160 break;
161 }
162
163 if (nents > 0) {
164 printk("verify_maps: dma maps consumed by some sgs remain (%d)\n",
165 nents);
166 return -1;
167 }
168
169 if (nents < 0) {
170 printk("verify_maps: Error, messed up mappings, "
171 "at sg %d dma_sg %d\n",
172 (int) (orig_nents + nents), (int) (dma_sg - orig_dma_sg));
173 return -1;
174 }
175
176 /* This test passes... */
177 return 0;
178}
179
180void verify_sglist(struct scatterlist *sglist, int nents, iopte_t *iopte, int npages)
181{
182 struct scatterlist *sg;
183
184 if (verify_lengths(sglist, nents, npages) < 0 ||
185 verify_maps(sglist, nents, iopte) < 0) {
186 int i;
187
188 printk("verify_sglist: Crap, messed up mappings, dumping, iodma at ");
189 printk("%016lx.\n", sglist->dma_address & IO_PAGE_MASK);
190
191 for_each_sg(sglist, sg, nents, i) {
192 printk("sg(%d): page_addr(%p) off(%x) length(%x) "
193 "dma_address[%016x] dma_length[%016x]\n",
194 i,
195 page_address(sg_page(sg)), sg->offset,
196 sg->length,
197 sg->dma_address, sg->dma_length);
198 }
199 }
200
201 /* Seems to be ok */
202}
203#endif
204
205unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents)
206{
207 struct scatterlist *dma_sg = sg;
208 unsigned long prev;
209 u32 dent_addr, dent_len;
210 unsigned int max_seg_size;
211
212 prev = (unsigned long) sg_virt(sg);
213 prev += (unsigned long) (dent_len = sg->length);
214 dent_addr = (u32) ((unsigned long)(sg_virt(sg)) & (IO_PAGE_SIZE - 1UL));
215 max_seg_size = dma_get_max_seg_size(dev);
216 while (--nents) {
217 unsigned long addr;
218
219 sg = sg_next(sg);
220 addr = (unsigned long) sg_virt(sg);
221 if (! VCONTIG(prev, addr) ||
222 dent_len + sg->length > max_seg_size) {
223 dma_sg->dma_address = dent_addr;
224 dma_sg->dma_length = dent_len;
225 dma_sg = sg_next(dma_sg);
226
227 dent_addr = ((dent_addr +
228 dent_len +
229 (IO_PAGE_SIZE - 1UL)) >> IO_PAGE_SHIFT);
230 dent_addr <<= IO_PAGE_SHIFT;
231 dent_addr += addr & (IO_PAGE_SIZE - 1UL);
232 dent_len = 0;
233 }
234 dent_len += sg->length;
235 prev = addr + sg->length;
236 }
237 dma_sg->dma_address = dent_addr;
238 dma_sg->dma_length = dent_len;
239
240 if (dma_sg != sg) {
241 dma_sg = sg_next(dma_sg);
242 dma_sg->dma_length = 0;
243 }
244
245 return ((unsigned long) dent_addr +
246 (unsigned long) dent_len +
247 (IO_PAGE_SIZE - 1UL)) >> IO_PAGE_SHIFT;
248}
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