FreeBSD/Linux Kernel Cross Reference
sys/dev/ata/ata-dma.c
1 /*-
2 * Copyright (c) 1998 - 2008 Søren 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>
28 __FBSDID("$FreeBSD: head/sys/dev/ata/ata-dma.c 198717 2009-10-31 13:24:14Z mav $");
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 */
46 static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
47 static void ata_dmaalloc(device_t dev);
48 static void ata_dmafree(device_t dev);
49 static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
50 static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs);
51 static int ata_dmaunload(struct ata_request *request);
52
53 /* local vars */
54 static 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
60 struct ata_dc_cb_args {
61 bus_addr_t maddr;
62 int error;
63 };
64
65 void
66 ata_dmainit(device_t dev)
67 {
68 struct ata_channel *ch = device_get_softc(dev);
69 struct ata_dc_cb_args dcba;
70
71 ch->dma.alloc = ata_dmaalloc;
72 ch->dma.free = ata_dmafree;
73 ch->dma.setprd = ata_dmasetprd;
74 ch->dma.load = ata_dmaload;
75 ch->dma.unload = ata_dmaunload;
76 ch->dma.alignment = 2;
77 ch->dma.boundary = 65536;
78 ch->dma.segsize = 65536;
79 ch->dma.max_iosize = 128 * DEV_BSIZE;
80 ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT;
81 ch->dma.dma_slots = 1;
82
83 if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0,
84 ch->dma.max_address, BUS_SPACE_MAXADDR,
85 NULL, NULL, ch->dma.max_iosize,
86 ATA_DMA_ENTRIES, ch->dma.segsize,
87 0, NULL, NULL, &ch->dma.dmatag))
88 goto error;
89
90 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024,
91 ch->dma.max_address, BUS_SPACE_MAXADDR,
92 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
93 0, NULL, NULL, &ch->dma.work_tag))
94 goto error;
95
96 if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work, 0,
97 &ch->dma.work_map))
98 goto error;
99
100 if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
101 MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) ||
102 dcba.error) {
103 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
104 goto error;
105 }
106 ch->dma.work_bus = dcba.maddr;
107 return;
108
109 error:
110 device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n");
111 ata_dmafini(dev);
112 }
113
114 void
115 ata_dmafini(device_t dev)
116 {
117 struct ata_channel *ch = device_get_softc(dev);
118
119 if (ch->dma.work_bus) {
120 bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map);
121 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
122 ch->dma.work_bus = 0;
123 ch->dma.work_map = NULL;
124 ch->dma.work = NULL;
125 }
126 if (ch->dma.work_tag) {
127 bus_dma_tag_destroy(ch->dma.work_tag);
128 ch->dma.work_tag = NULL;
129 }
130 if (ch->dma.dmatag) {
131 bus_dma_tag_destroy(ch->dma.dmatag);
132 ch->dma.dmatag = NULL;
133 }
134 }
135
136 static void
137 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
138 {
139 struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc;
140
141 if (!(dcba->error = error))
142 dcba->maddr = segs[0].ds_addr;
143 }
144
145 static void
146 ata_dmaalloc(device_t dev)
147 {
148 struct ata_channel *ch = device_get_softc(dev);
149 struct ata_dc_cb_args dcba;
150 int i;
151
152 /* alloc and setup needed dma slots */
153 bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS);
154 for (i = 0; i < ch->dma.dma_slots; i++) {
155 struct ata_dmaslot *slot = &ch->dma.slot[i];
156
157 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE,
158 ch->dma.max_address, BUS_SPACE_MAXADDR,
159 NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE,
160 0, NULL, NULL, &slot->sg_tag)) {
161 device_printf(ch->dev, "FAILURE - create sg_tag\n");
162 goto error;
163 }
164
165 if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg,
166 0, &slot->sg_map)) {
167 device_printf(ch->dev, "FAILURE - alloc sg_map\n");
168 goto error;
169 }
170
171 if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ,
172 ata_dmasetupc_cb, &dcba, 0) || dcba.error) {
173 device_printf(ch->dev, "FAILURE - load sg\n");
174 goto error;
175 }
176 slot->sg_bus = dcba.maddr;
177
178 if (bus_dma_tag_create(ch->dma.dmatag,
179 ch->dma.alignment, ch->dma.boundary,
180 ch->dma.max_address, BUS_SPACE_MAXADDR,
181 NULL, NULL, ch->dma.max_iosize,
182 ATA_DMA_ENTRIES, ch->dma.segsize,
183 BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) {
184 device_printf(ch->dev, "FAILURE - create data_tag\n");
185 goto error;
186 }
187
188 if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) {
189 device_printf(ch->dev, "FAILURE - create data_map\n");
190 goto error;
191 }
192 }
193
194 return;
195
196 error:
197 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
198 ata_dmafree(dev);
199 }
200
201 static void
202 ata_dmafree(device_t dev)
203 {
204 struct ata_channel *ch = device_get_softc(dev);
205 int i;
206
207 /* free all dma slots */
208 for (i = 0; i < ATA_DMA_SLOTS; i++) {
209 struct ata_dmaslot *slot = &ch->dma.slot[i];
210
211 if (slot->sg_bus) {
212 bus_dmamap_unload(slot->sg_tag, slot->sg_map);
213 slot->sg_bus = 0;
214 }
215 if (slot->sg_map) {
216 bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map);
217 bus_dmamap_destroy(slot->sg_tag, slot->sg_map);
218 slot->sg = NULL;
219 slot->sg_map = NULL;
220 }
221 if (slot->data_map) {
222 bus_dmamap_destroy(slot->data_tag, slot->data_map);
223 slot->data_map = NULL;
224 }
225 if (slot->sg_tag) {
226 bus_dma_tag_destroy(slot->sg_tag);
227 slot->sg_tag = NULL;
228 }
229 if (slot->data_tag) {
230 bus_dma_tag_destroy(slot->data_tag);
231 slot->data_tag = NULL;
232 }
233 }
234 }
235
236 static void
237 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
238 {
239 struct ata_dmasetprd_args *args = xsc;
240 struct ata_dma_prdentry *prd = args->dmatab;
241 int i;
242
243 if ((args->error = error))
244 return;
245
246 for (i = 0; i < nsegs; i++) {
247 prd[i].addr = htole32(segs[i].ds_addr);
248 prd[i].count = htole32(segs[i].ds_len);
249 }
250 prd[i - 1].count |= htole32(ATA_DMA_EOT);
251 KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n"));
252 args->nsegs = nsegs;
253 }
254
255 static int
256 ata_dmaload(struct ata_request *request, void *addr, int *entries)
257 {
258 struct ata_channel *ch = device_get_softc(request->parent);
259 struct ata_dmasetprd_args dspa;
260 int error;
261
262 ATA_DEBUG_RQ(request, "dmaload");
263
264 if (request->dma) {
265 device_printf(request->parent,
266 "FAILURE - already active DMA on this device\n");
267 return EIO;
268 }
269 if (!request->bytecount) {
270 device_printf(request->parent,
271 "FAILURE - zero length DMA transfer attempted\n");
272 return EIO;
273 }
274 if (request->bytecount & (ch->dma.alignment - 1)) {
275 device_printf(request->parent,
276 "FAILURE - odd-sized DMA transfer attempt %d %% %d\n",
277 request->bytecount, ch->dma.alignment);
278 return EIO;
279 }
280 if (request->bytecount > ch->dma.max_iosize) {
281 device_printf(request->parent,
282 "FAILURE - oversized DMA transfer attempt %d > %d\n",
283 request->bytecount, ch->dma.max_iosize);
284 return EIO;
285 }
286
287 /* set our slot. XXX SOS NCQ will change that */
288 request->dma = &ch->dma.slot[0];
289
290 if (addr)
291 dspa.dmatab = addr;
292 else
293 dspa.dmatab = request->dma->sg;
294
295 if ((error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map,
296 request->data, request->bytecount,
297 ch->dma.setprd, &dspa, BUS_DMA_NOWAIT)) ||
298 (error = dspa.error)) {
299 device_printf(request->parent, "FAILURE - load data\n");
300 goto error;
301 }
302
303 if (entries)
304 *entries = dspa.nsegs;
305
306 bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
307 BUS_DMASYNC_PREWRITE);
308 bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
309 (request->flags & ATA_R_READ) ?
310 BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
311 return 0;
312
313 error:
314 ata_dmaunload(request);
315 return EIO;
316 }
317
318 int
319 ata_dmaunload(struct ata_request *request)
320 {
321 ATA_DEBUG_RQ(request, "dmaunload");
322
323 if (request->dma) {
324 bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
325 BUS_DMASYNC_POSTWRITE);
326 bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
327 (request->flags & ATA_R_READ) ?
328 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
329
330 bus_dmamap_unload(request->dma->data_tag, request->dma->data_map);
331 request->dma = NULL;
332 }
333 return 0;
334 }
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