Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ata/ata-dma.c
Version:
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1998 - 2008 Søren Schmidt <sos@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification, immediately at the beginning of the file. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/ata.h> 35 #include <sys/kernel.h> 36 #include <sys/endian.h> 37 #include <sys/malloc.h> 38 #include <sys/lock.h> 39 #include <sys/sema.h> 40 #include <sys/taskqueue.h> 41 #include <vm/uma.h> 42 #include <sys/bus.h> 43 #include <machine/bus.h> 44 #include <sys/rman.h> 45 #include <dev/ata/ata-all.h> 46 47 /* prototypes */ 48 static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error); 49 static void ata_dmaalloc(device_t dev); 50 static void ata_dmafree(device_t dev); 51 static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error); 52 static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs); 53 static int ata_dmaunload(struct ata_request *request); 54 55 /* local vars */ 56 static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA"); 57 58 /* misc defines */ 59 #define MAXTABSZ PAGE_SIZE 60 #define MAXWSPCSZ PAGE_SIZE*2 61 62 struct ata_dc_cb_args { 63 bus_addr_t maddr; 64 int error; 65 }; 66 67 void 68 ata_dmainit(device_t dev) 69 { 70 struct ata_channel *ch = device_get_softc(dev); 71 struct ata_dc_cb_args dcba; 72 73 if (ch->dma.alloc == NULL) 74 ch->dma.alloc = ata_dmaalloc; 75 if (ch->dma.free == NULL) 76 ch->dma.free = ata_dmafree; 77 if (ch->dma.setprd == NULL) 78 ch->dma.setprd = ata_dmasetprd; 79 if (ch->dma.load == NULL) 80 ch->dma.load = ata_dmaload; 81 if (ch->dma.unload == NULL) 82 ch->dma.unload = ata_dmaunload; 83 if (ch->dma.alignment == 0) 84 ch->dma.alignment = 2; 85 if (ch->dma.boundary == 0) 86 ch->dma.boundary = 65536; 87 if (ch->dma.segsize == 0) 88 ch->dma.segsize = 65536; 89 if (ch->dma.max_iosize == 0) 90 ch->dma.max_iosize = (ATA_DMA_ENTRIES - 1) * PAGE_SIZE; 91 if (ch->dma.max_address == 0) 92 ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT; 93 if (ch->dma.dma_slots == 0) 94 ch->dma.dma_slots = 1; 95 96 if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0, 97 ch->dma.max_address, BUS_SPACE_MAXADDR, 98 NULL, NULL, ch->dma.max_iosize, 99 ATA_DMA_ENTRIES, ch->dma.segsize, 100 0, NULL, NULL, &ch->dma.dmatag)) 101 goto error; 102 103 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024, 104 ch->dma.max_address, BUS_SPACE_MAXADDR, 105 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 106 0, NULL, NULL, &ch->dma.work_tag)) 107 goto error; 108 109 if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work, 110 BUS_DMA_WAITOK | BUS_DMA_COHERENT, 111 &ch->dma.work_map)) 112 goto error; 113 114 if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work, 115 MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) || 116 dcba.error) { 117 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map); 118 goto error; 119 } 120 ch->dma.work_bus = dcba.maddr; 121 return; 122 123 error: 124 device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n"); 125 ata_dmafini(dev); 126 } 127 128 void 129 ata_dmafini(device_t dev) 130 { 131 struct ata_channel *ch = device_get_softc(dev); 132 133 if (ch->dma.work_bus) { 134 bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map); 135 bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map); 136 ch->dma.work_bus = 0; 137 ch->dma.work = NULL; 138 } 139 if (ch->dma.work_tag) { 140 bus_dma_tag_destroy(ch->dma.work_tag); 141 ch->dma.work_tag = NULL; 142 } 143 if (ch->dma.dmatag) { 144 bus_dma_tag_destroy(ch->dma.dmatag); 145 ch->dma.dmatag = NULL; 146 } 147 } 148 149 static void 150 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 151 { 152 struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc; 153 154 if (!(dcba->error = error)) 155 dcba->maddr = segs[0].ds_addr; 156 } 157 158 static void 159 ata_dmaalloc(device_t dev) 160 { 161 struct ata_channel *ch = device_get_softc(dev); 162 struct ata_dc_cb_args dcba; 163 int i; 164 165 /* alloc and setup needed dma slots */ 166 bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS); 167 for (i = 0; i < ch->dma.dma_slots; i++) { 168 struct ata_dmaslot *slot = &ch->dma.slot[i]; 169 170 if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE, 171 ch->dma.max_address, BUS_SPACE_MAXADDR, 172 NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE, 173 0, NULL, NULL, &slot->sg_tag)) { 174 device_printf(ch->dev, "FAILURE - create sg_tag\n"); 175 goto error; 176 } 177 178 if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, BUS_DMA_WAITOK, 179 &slot->sg_map)) { 180 device_printf(ch->dev, "FAILURE - alloc sg_map\n"); 181 goto error; 182 } 183 184 if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ, 185 ata_dmasetupc_cb, &dcba, 0) || dcba.error) { 186 device_printf(ch->dev, "FAILURE - load sg\n"); 187 goto error; 188 } 189 slot->sg_bus = dcba.maddr; 190 191 if (bus_dma_tag_create(ch->dma.dmatag, 192 ch->dma.alignment, ch->dma.boundary, 193 ch->dma.max_address, BUS_SPACE_MAXADDR, 194 NULL, NULL, ch->dma.max_iosize, 195 ATA_DMA_ENTRIES, ch->dma.segsize, 196 BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) { 197 device_printf(ch->dev, "FAILURE - create data_tag\n"); 198 goto error; 199 } 200 201 if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) { 202 device_printf(ch->dev, "FAILURE - create data_map\n"); 203 goto error; 204 } 205 } 206 207 return; 208 209 error: 210 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n"); 211 ata_dmafree(dev); 212 } 213 214 static void 215 ata_dmafree(device_t dev) 216 { 217 struct ata_channel *ch = device_get_softc(dev); 218 int i; 219 220 /* free all dma slots */ 221 for (i = 0; i < ATA_DMA_SLOTS; i++) { 222 struct ata_dmaslot *slot = &ch->dma.slot[i]; 223 224 if (slot->sg_bus) { 225 bus_dmamap_unload(slot->sg_tag, slot->sg_map); 226 slot->sg_bus = 0; 227 } 228 if (slot->sg) { 229 bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map); 230 slot->sg = NULL; 231 } 232 if (slot->data_map) { 233 bus_dmamap_destroy(slot->data_tag, slot->data_map); 234 slot->data_map = NULL; 235 } 236 if (slot->sg_tag) { 237 bus_dma_tag_destroy(slot->sg_tag); 238 slot->sg_tag = NULL; 239 } 240 if (slot->data_tag) { 241 bus_dma_tag_destroy(slot->data_tag); 242 slot->data_tag = NULL; 243 } 244 } 245 } 246 247 static void 248 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 249 { 250 struct ata_dmasetprd_args *args = xsc; 251 struct ata_dma_prdentry *prd = args->dmatab; 252 int i; 253 254 if ((args->error = error)) 255 return; 256 257 for (i = 0; i < nsegs; i++) { 258 prd[i].addr = htole32(segs[i].ds_addr); 259 prd[i].count = htole32(segs[i].ds_len); 260 } 261 prd[i - 1].count |= htole32(ATA_DMA_EOT); 262 KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n")); 263 args->nsegs = nsegs; 264 } 265 266 static int 267 ata_dmaload(struct ata_request *request, void *addr, int *entries) 268 { 269 struct ata_channel *ch = device_get_softc(request->parent); 270 struct ata_dmasetprd_args dspa; 271 int error; 272 273 ATA_DEBUG_RQ(request, "dmaload"); 274 275 if (request->dma) { 276 device_printf(request->parent, 277 "FAILURE - already active DMA on this device\n"); 278 return EIO; 279 } 280 if (!request->bytecount) { 281 device_printf(request->parent, 282 "FAILURE - zero length DMA transfer attempted\n"); 283 return EIO; 284 } 285 if (request->bytecount & (ch->dma.alignment - 1)) { 286 device_printf(request->parent, 287 "FAILURE - odd-sized DMA transfer attempt %d %% %d\n", 288 request->bytecount, ch->dma.alignment); 289 return EIO; 290 } 291 if (request->bytecount > ch->dma.max_iosize) { 292 device_printf(request->parent, 293 "FAILURE - oversized DMA transfer attempt %d > %d\n", 294 request->bytecount, ch->dma.max_iosize); 295 return EIO; 296 } 297 298 /* set our slot. XXX SOS NCQ will change that */ 299 request->dma = &ch->dma.slot[0]; 300 301 if (addr) 302 dspa.dmatab = addr; 303 else 304 dspa.dmatab = request->dma->sg; 305 306 if (request->flags & ATA_R_DATA_IN_CCB) 307 error = bus_dmamap_load_ccb(request->dma->data_tag, 308 request->dma->data_map, request->ccb, 309 ch->dma.setprd, &dspa, BUS_DMA_NOWAIT); 310 else 311 error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map, 312 request->data, request->bytecount, 313 ch->dma.setprd, &dspa, BUS_DMA_NOWAIT); 314 if (error || (error = dspa.error)) { 315 device_printf(request->parent, "FAILURE - load data\n"); 316 goto error; 317 } 318 319 if (entries) 320 *entries = dspa.nsegs; 321 322 bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map, 323 BUS_DMASYNC_PREWRITE); 324 bus_dmamap_sync(request->dma->data_tag, request->dma->data_map, 325 (request->flags & ATA_R_READ) ? 326 BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 327 return 0; 328 329 error: 330 ata_dmaunload(request); 331 return EIO; 332 } 333 334 int 335 ata_dmaunload(struct ata_request *request) 336 { 337 ATA_DEBUG_RQ(request, "dmaunload"); 338 339 if (request->dma) { 340 bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map, 341 BUS_DMASYNC_POSTWRITE); 342 bus_dmamap_sync(request->dma->data_tag, request->dma->data_map, 343 (request->flags & ATA_R_READ) ? 344 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 345 346 bus_dmamap_unload(request->dma->data_tag, request->dma->data_map); 347 request->dma = NULL; 348 } 349 return 0; 350 }
Cache object: 20c794ec5ba0aa4478fc10579234060a
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