1/*-
2 * Copyright (c) 1998 - 2008 S��ren Schmidt <sos@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification, immediately at the beginning of the file.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1998 - 2008 S��ren Schmidt <sos@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification, immediately at the beginning of the file.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
|
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/ata.h>
33#include <sys/kernel.h>
34#include <sys/endian.h>
35#include <sys/malloc.h>
36#include <sys/lock.h>
37#include <sys/sema.h>
38#include <sys/taskqueue.h>
39#include <vm/uma.h>
40#include <sys/bus.h>
41#include <machine/bus.h>
42#include <sys/rman.h>
43#include <dev/ata/ata-all.h>
44
45/* prototypes */
46static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
47static void ata_dmaalloc(device_t dev);
48static void ata_dmafree(device_t dev);
49static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
50static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs);
51static int ata_dmaunload(struct ata_request *request);
52
53/* local vars */
54static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA");
55
56/* misc defines */
57#define MAXTABSZ PAGE_SIZE
58#define MAXWSPCSZ PAGE_SIZE*2
59
60struct ata_dc_cb_args {
61 bus_addr_t maddr;
62 int error;
63};
64
65void
66ata_dmainit(device_t dev)
67{
68 struct ata_channel *ch = device_get_softc(dev);
69 struct ata_dc_cb_args dcba;
70
71 if (ch->dma.alloc == NULL)
72 ch->dma.alloc = ata_dmaalloc;
73 if (ch->dma.free == NULL)
74 ch->dma.free = ata_dmafree;
75 if (ch->dma.setprd == NULL)
76 ch->dma.setprd = ata_dmasetprd;
77 if (ch->dma.load == NULL)
78 ch->dma.load = ata_dmaload;
79 if (ch->dma.unload == NULL)
80 ch->dma.unload = ata_dmaunload;
81 if (ch->dma.alignment == 0)
82 ch->dma.alignment = 2;
83 if (ch->dma.boundary == 0)
84 ch->dma.boundary = 65536;
85 if (ch->dma.segsize == 0)
86 ch->dma.segsize = 65536;
87 if (ch->dma.max_iosize == 0)
88 ch->dma.max_iosize = MIN((ATA_DMA_ENTRIES - 1) * PAGE_SIZE, MAXPHYS);
89 if (ch->dma.max_address == 0)
90 ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT;
91 if (ch->dma.dma_slots == 0)
92 ch->dma.dma_slots = 1;
93
94 if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0,
95 ch->dma.max_address, BUS_SPACE_MAXADDR,
96 NULL, NULL, ch->dma.max_iosize,
97 ATA_DMA_ENTRIES, ch->dma.segsize,
98 0, NULL, NULL, &ch->dma.dmatag))
99 goto error;
100
101 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024,
102 ch->dma.max_address, BUS_SPACE_MAXADDR,
103 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
104 0, NULL, NULL, &ch->dma.work_tag))
105 goto error;
106
107 if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work,
108 BUS_DMA_WAITOK | BUS_DMA_COHERENT,
109 &ch->dma.work_map))
110 goto error;
111
112 if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
113 MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) ||
114 dcba.error) {
115 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
116 goto error;
117 }
118 ch->dma.work_bus = dcba.maddr;
119 return;
120
121error:
122 device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n");
123 ata_dmafini(dev);
124}
125
126void
127ata_dmafini(device_t dev)
128{
129 struct ata_channel *ch = device_get_softc(dev);
130
131 if (ch->dma.work_bus) {
132 bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map);
133 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
134 ch->dma.work_bus = 0;
135 ch->dma.work_map = NULL;
136 ch->dma.work = NULL;
137 }
138 if (ch->dma.work_tag) {
139 bus_dma_tag_destroy(ch->dma.work_tag);
140 ch->dma.work_tag = NULL;
141 }
142 if (ch->dma.dmatag) {
143 bus_dma_tag_destroy(ch->dma.dmatag);
144 ch->dma.dmatag = NULL;
145 }
146}
147
148static void
149ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
150{
151 struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc;
152
153 if (!(dcba->error = error))
154 dcba->maddr = segs[0].ds_addr;
155}
156
157static void
158ata_dmaalloc(device_t dev)
159{
160 struct ata_channel *ch = device_get_softc(dev);
161 struct ata_dc_cb_args dcba;
162 int i;
163
164 /* alloc and setup needed dma slots */
165 bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS);
166 for (i = 0; i < ch->dma.dma_slots; i++) {
167 struct ata_dmaslot *slot = &ch->dma.slot[i];
168
169 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE,
170 ch->dma.max_address, BUS_SPACE_MAXADDR,
171 NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE,
172 0, NULL, NULL, &slot->sg_tag)) {
173 device_printf(ch->dev, "FAILURE - create sg_tag\n");
174 goto error;
175 }
176
177 if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, BUS_DMA_WAITOK,
178 &slot->sg_map)) {
179 device_printf(ch->dev, "FAILURE - alloc sg_map\n");
180 goto error;
181 }
182
183 if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ,
184 ata_dmasetupc_cb, &dcba, 0) || dcba.error) {
185 device_printf(ch->dev, "FAILURE - load sg\n");
186 goto error;
187 }
188 slot->sg_bus = dcba.maddr;
189
190 if (bus_dma_tag_create(ch->dma.dmatag,
191 ch->dma.alignment, ch->dma.boundary,
192 ch->dma.max_address, BUS_SPACE_MAXADDR,
193 NULL, NULL, ch->dma.max_iosize,
194 ATA_DMA_ENTRIES, ch->dma.segsize,
195 BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) {
196 device_printf(ch->dev, "FAILURE - create data_tag\n");
197 goto error;
198 }
199
200 if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) {
201 device_printf(ch->dev, "FAILURE - create data_map\n");
202 goto error;
203 }
204 }
205
206 return;
207
208error:
209 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
210 ata_dmafree(dev);
211}
212
213static void
214ata_dmafree(device_t dev)
215{
216 struct ata_channel *ch = device_get_softc(dev);
217 int i;
218
219 /* free all dma slots */
220 for (i = 0; i < ATA_DMA_SLOTS; i++) {
221 struct ata_dmaslot *slot = &ch->dma.slot[i];
222
223 if (slot->sg_bus) {
224 bus_dmamap_unload(slot->sg_tag, slot->sg_map);
225 slot->sg_bus = 0;
226 }
227 if (slot->sg_map) {
228 bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map);
229 bus_dmamap_destroy(slot->sg_tag, slot->sg_map);
230 slot->sg = NULL;
231 slot->sg_map = NULL;
232 }
233 if (slot->data_map) {
234 bus_dmamap_destroy(slot->data_tag, slot->data_map);
235 slot->data_map = NULL;
236 }
237 if (slot->sg_tag) {
238 bus_dma_tag_destroy(slot->sg_tag);
239 slot->sg_tag = NULL;
240 }
241 if (slot->data_tag) {
242 bus_dma_tag_destroy(slot->data_tag);
243 slot->data_tag = NULL;
244 }
245 }
246}
247
248static void
249ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
250{
251 struct ata_dmasetprd_args *args = xsc;
252 struct ata_dma_prdentry *prd = args->dmatab;
253 int i;
254
255 if ((args->error = error))
256 return;
257
258 for (i = 0; i < nsegs; i++) {
259 prd[i].addr = htole32(segs[i].ds_addr);
260 prd[i].count = htole32(segs[i].ds_len);
261 }
262 prd[i - 1].count |= htole32(ATA_DMA_EOT);
263 KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n"));
264 args->nsegs = nsegs;
265}
266
267static int
268ata_dmaload(struct ata_request *request, void *addr, int *entries)
269{
270 struct ata_channel *ch = device_get_softc(request->parent);
271 struct ata_dmasetprd_args dspa;
272 int error;
273
274 ATA_DEBUG_RQ(request, "dmaload");
275
276 if (request->dma) {
277 device_printf(request->parent,
278 "FAILURE - already active DMA on this device\n");
279 return EIO;
280 }
281 if (!request->bytecount) {
282 device_printf(request->parent,
283 "FAILURE - zero length DMA transfer attempted\n");
284 return EIO;
285 }
286 if (request->bytecount & (ch->dma.alignment - 1)) {
287 device_printf(request->parent,
288 "FAILURE - odd-sized DMA transfer attempt %d %% %d\n",
289 request->bytecount, ch->dma.alignment);
290 return EIO;
291 }
292 if (request->bytecount > ch->dma.max_iosize) {
293 device_printf(request->parent,
294 "FAILURE - oversized DMA transfer attempt %d > %d\n",
295 request->bytecount, ch->dma.max_iosize);
296 return EIO;
297 }
298
299 /* set our slot. XXX SOS NCQ will change that */
300 request->dma = &ch->dma.slot[0];
301
302 if (addr)
303 dspa.dmatab = addr;
304 else
305 dspa.dmatab = request->dma->sg;
306
| 29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/ata.h>
33#include <sys/kernel.h>
34#include <sys/endian.h>
35#include <sys/malloc.h>
36#include <sys/lock.h>
37#include <sys/sema.h>
38#include <sys/taskqueue.h>
39#include <vm/uma.h>
40#include <sys/bus.h>
41#include <machine/bus.h>
42#include <sys/rman.h>
43#include <dev/ata/ata-all.h>
44
45/* prototypes */
46static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
47static void ata_dmaalloc(device_t dev);
48static void ata_dmafree(device_t dev);
49static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
50static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs);
51static int ata_dmaunload(struct ata_request *request);
52
53/* local vars */
54static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA");
55
56/* misc defines */
57#define MAXTABSZ PAGE_SIZE
58#define MAXWSPCSZ PAGE_SIZE*2
59
60struct ata_dc_cb_args {
61 bus_addr_t maddr;
62 int error;
63};
64
65void
66ata_dmainit(device_t dev)
67{
68 struct ata_channel *ch = device_get_softc(dev);
69 struct ata_dc_cb_args dcba;
70
71 if (ch->dma.alloc == NULL)
72 ch->dma.alloc = ata_dmaalloc;
73 if (ch->dma.free == NULL)
74 ch->dma.free = ata_dmafree;
75 if (ch->dma.setprd == NULL)
76 ch->dma.setprd = ata_dmasetprd;
77 if (ch->dma.load == NULL)
78 ch->dma.load = ata_dmaload;
79 if (ch->dma.unload == NULL)
80 ch->dma.unload = ata_dmaunload;
81 if (ch->dma.alignment == 0)
82 ch->dma.alignment = 2;
83 if (ch->dma.boundary == 0)
84 ch->dma.boundary = 65536;
85 if (ch->dma.segsize == 0)
86 ch->dma.segsize = 65536;
87 if (ch->dma.max_iosize == 0)
88 ch->dma.max_iosize = MIN((ATA_DMA_ENTRIES - 1) * PAGE_SIZE, MAXPHYS);
89 if (ch->dma.max_address == 0)
90 ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT;
91 if (ch->dma.dma_slots == 0)
92 ch->dma.dma_slots = 1;
93
94 if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0,
95 ch->dma.max_address, BUS_SPACE_MAXADDR,
96 NULL, NULL, ch->dma.max_iosize,
97 ATA_DMA_ENTRIES, ch->dma.segsize,
98 0, NULL, NULL, &ch->dma.dmatag))
99 goto error;
100
101 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024,
102 ch->dma.max_address, BUS_SPACE_MAXADDR,
103 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
104 0, NULL, NULL, &ch->dma.work_tag))
105 goto error;
106
107 if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work,
108 BUS_DMA_WAITOK | BUS_DMA_COHERENT,
109 &ch->dma.work_map))
110 goto error;
111
112 if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
113 MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) ||
114 dcba.error) {
115 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
116 goto error;
117 }
118 ch->dma.work_bus = dcba.maddr;
119 return;
120
121error:
122 device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n");
123 ata_dmafini(dev);
124}
125
126void
127ata_dmafini(device_t dev)
128{
129 struct ata_channel *ch = device_get_softc(dev);
130
131 if (ch->dma.work_bus) {
132 bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map);
133 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
134 ch->dma.work_bus = 0;
135 ch->dma.work_map = NULL;
136 ch->dma.work = NULL;
137 }
138 if (ch->dma.work_tag) {
139 bus_dma_tag_destroy(ch->dma.work_tag);
140 ch->dma.work_tag = NULL;
141 }
142 if (ch->dma.dmatag) {
143 bus_dma_tag_destroy(ch->dma.dmatag);
144 ch->dma.dmatag = NULL;
145 }
146}
147
148static void
149ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
150{
151 struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc;
152
153 if (!(dcba->error = error))
154 dcba->maddr = segs[0].ds_addr;
155}
156
157static void
158ata_dmaalloc(device_t dev)
159{
160 struct ata_channel *ch = device_get_softc(dev);
161 struct ata_dc_cb_args dcba;
162 int i;
163
164 /* alloc and setup needed dma slots */
165 bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS);
166 for (i = 0; i < ch->dma.dma_slots; i++) {
167 struct ata_dmaslot *slot = &ch->dma.slot[i];
168
169 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE,
170 ch->dma.max_address, BUS_SPACE_MAXADDR,
171 NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE,
172 0, NULL, NULL, &slot->sg_tag)) {
173 device_printf(ch->dev, "FAILURE - create sg_tag\n");
174 goto error;
175 }
176
177 if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, BUS_DMA_WAITOK,
178 &slot->sg_map)) {
179 device_printf(ch->dev, "FAILURE - alloc sg_map\n");
180 goto error;
181 }
182
183 if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ,
184 ata_dmasetupc_cb, &dcba, 0) || dcba.error) {
185 device_printf(ch->dev, "FAILURE - load sg\n");
186 goto error;
187 }
188 slot->sg_bus = dcba.maddr;
189
190 if (bus_dma_tag_create(ch->dma.dmatag,
191 ch->dma.alignment, ch->dma.boundary,
192 ch->dma.max_address, BUS_SPACE_MAXADDR,
193 NULL, NULL, ch->dma.max_iosize,
194 ATA_DMA_ENTRIES, ch->dma.segsize,
195 BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) {
196 device_printf(ch->dev, "FAILURE - create data_tag\n");
197 goto error;
198 }
199
200 if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) {
201 device_printf(ch->dev, "FAILURE - create data_map\n");
202 goto error;
203 }
204 }
205
206 return;
207
208error:
209 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
210 ata_dmafree(dev);
211}
212
213static void
214ata_dmafree(device_t dev)
215{
216 struct ata_channel *ch = device_get_softc(dev);
217 int i;
218
219 /* free all dma slots */
220 for (i = 0; i < ATA_DMA_SLOTS; i++) {
221 struct ata_dmaslot *slot = &ch->dma.slot[i];
222
223 if (slot->sg_bus) {
224 bus_dmamap_unload(slot->sg_tag, slot->sg_map);
225 slot->sg_bus = 0;
226 }
227 if (slot->sg_map) {
228 bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map);
229 bus_dmamap_destroy(slot->sg_tag, slot->sg_map);
230 slot->sg = NULL;
231 slot->sg_map = NULL;
232 }
233 if (slot->data_map) {
234 bus_dmamap_destroy(slot->data_tag, slot->data_map);
235 slot->data_map = NULL;
236 }
237 if (slot->sg_tag) {
238 bus_dma_tag_destroy(slot->sg_tag);
239 slot->sg_tag = NULL;
240 }
241 if (slot->data_tag) {
242 bus_dma_tag_destroy(slot->data_tag);
243 slot->data_tag = NULL;
244 }
245 }
246}
247
248static void
249ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
250{
251 struct ata_dmasetprd_args *args = xsc;
252 struct ata_dma_prdentry *prd = args->dmatab;
253 int i;
254
255 if ((args->error = error))
256 return;
257
258 for (i = 0; i < nsegs; i++) {
259 prd[i].addr = htole32(segs[i].ds_addr);
260 prd[i].count = htole32(segs[i].ds_len);
261 }
262 prd[i - 1].count |= htole32(ATA_DMA_EOT);
263 KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n"));
264 args->nsegs = nsegs;
265}
266
267static int
268ata_dmaload(struct ata_request *request, void *addr, int *entries)
269{
270 struct ata_channel *ch = device_get_softc(request->parent);
271 struct ata_dmasetprd_args dspa;
272 int error;
273
274 ATA_DEBUG_RQ(request, "dmaload");
275
276 if (request->dma) {
277 device_printf(request->parent,
278 "FAILURE - already active DMA on this device\n");
279 return EIO;
280 }
281 if (!request->bytecount) {
282 device_printf(request->parent,
283 "FAILURE - zero length DMA transfer attempted\n");
284 return EIO;
285 }
286 if (request->bytecount & (ch->dma.alignment - 1)) {
287 device_printf(request->parent,
288 "FAILURE - odd-sized DMA transfer attempt %d %% %d\n",
289 request->bytecount, ch->dma.alignment);
290 return EIO;
291 }
292 if (request->bytecount > ch->dma.max_iosize) {
293 device_printf(request->parent,
294 "FAILURE - oversized DMA transfer attempt %d > %d\n",
295 request->bytecount, ch->dma.max_iosize);
296 return EIO;
297 }
298
299 /* set our slot. XXX SOS NCQ will change that */
300 request->dma = &ch->dma.slot[0];
301
302 if (addr)
303 dspa.dmatab = addr;
304 else
305 dspa.dmatab = request->dma->sg;
306
|