ata-dma.c revision 198717
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> 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 */ 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 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 109error: 110 device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n"); 111 ata_dmafini(dev); 112} 113 114void 115ata_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 136static void 137ata_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 145static void 146ata_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 196error: 197 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n"); 198 ata_dmafree(dev); 199} 200 201static void 202ata_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 236static void 237ata_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 255static int 256ata_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 313error: 314 ata_dmaunload(request); 315 return EIO; 316} 317 318int 319ata_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} 335