ata-dma.c revision 134090
1/*- 2 * Copyright (c) 1998 - 2004 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 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: head/sys/dev/ata/ata-dma.c 134090 2004-08-20 19:05:22Z sos $"); 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/pci/pcivar.h> 46#include <dev/ata/ata-all.h> 47#include <dev/ata/ata-pci.h> 48 49/* prototypes */ 50static void ata_dmaalloc(struct ata_channel *); 51static void ata_dmafree(struct ata_channel *); 52static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int); 53static int ata_dmaload(struct ata_device *, caddr_t, int32_t, int); 54static int ata_dmaunload(struct ata_channel *); 55 56/* local vars */ 57static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 58 59/* misc defines */ 60#define MAXTABSZ PAGE_SIZE 61#define MAXWSPCSZ PAGE_SIZE 62 63struct ata_dc_cb_args { 64 bus_addr_t maddr; 65 int error; 66}; 67 68void 69ata_dmainit(struct ata_channel *ch) 70{ 71 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 72 ch->dma->alloc = ata_dmaalloc; 73 ch->dma->free = ata_dmafree; 74 ch->dma->setprd = ata_dmasetprd; 75 ch->dma->load = ata_dmaload; 76 ch->dma->unload = ata_dmaunload; 77 ch->dma->alignment = 2; 78 ch->dma->max_iosize = 64 * 1024; 79 ch->dma->boundary = 64 * 1024; 80 } 81} 82 83static void 84ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 85{ 86 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 87 88 if (!(cba->error = error)) 89 cba->maddr = segs[0].ds_addr; 90} 91 92static void 93ata_dmaalloc(struct ata_channel *ch) 94{ 95 struct ata_dc_cb_args ccba; 96 97 if (bus_dma_tag_create(NULL, ch->dma->alignment, 0, 98 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 99 NULL, NULL, 16*1024*1024, 100 ATA_DMA_ENTRIES, ch->dma->max_iosize, 101 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->dmatag)) 102 goto error; 103 104 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 105 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 106 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 107 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 108 goto error; 109 110 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 111 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 112 NULL, NULL, 16*1024*1024, 113 ATA_DMA_ENTRIES, ch->dma->max_iosize, 114 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 115 goto error; 116 117 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 118 &ch->dma->cdmamap)) 119 goto error; 120 121 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 122 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 123 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 124 goto error; 125 } 126 ch->dma->mdmatab = ccba.maddr; 127 128 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 129 goto error; 130 131 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 132 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 133 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 134 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->wdmatag)) 135 goto error; 136 137 if (bus_dmamem_alloc(ch->dma->wdmatag, (void **)&ch->dma->workspace, 0, 138 &ch->dma->wdmamap)) 139 goto error; 140 141 if (bus_dmamap_load(ch->dma->wdmatag, ch->dma->wdmamap, ch->dma->workspace, 142 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 143 bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap); 144 goto error; 145 } 146 ch->dma->wdmatab = ccba.maddr; 147 148 return; 149 150error: 151 ata_printf(ch, -1, "WARNING - DMA allocation failed, disabling DMA\n"); 152 ata_dmafree(ch); 153 free(ch->dma, M_ATADMA); 154 ch->dma = NULL; 155} 156 157static void 158ata_dmafree(struct ata_channel *ch) 159{ 160 if (ch->dma->wdmatab) { 161 bus_dmamap_unload(ch->dma->wdmatag, ch->dma->wdmamap); 162 bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap); 163 ch->dma->wdmatab = 0; 164 ch->dma->wdmamap = NULL; 165 ch->dma->workspace = NULL; 166 } 167 if (ch->dma->wdmatag) { 168 bus_dma_tag_destroy(ch->dma->wdmatag); 169 ch->dma->wdmatag = NULL; 170 } 171 if (ch->dma->mdmatab) { 172 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 173 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 174 ch->dma->mdmatab = 0; 175 ch->dma->cdmamap = NULL; 176 ch->dma->dmatab = NULL; 177 } 178 if (ch->dma->ddmamap) { 179 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 180 ch->dma->ddmamap = NULL; 181 } 182 if (ch->dma->cdmatag) { 183 bus_dma_tag_destroy(ch->dma->cdmatag); 184 ch->dma->cdmatag = NULL; 185 } 186 if (ch->dma->ddmatag) { 187 bus_dma_tag_destroy(ch->dma->ddmatag); 188 ch->dma->ddmatag = NULL; 189 } 190 if (ch->dma->dmatag) { 191 bus_dma_tag_destroy(ch->dma->dmatag); 192 ch->dma->dmatag = NULL; 193 } 194} 195 196static void 197ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 198{ 199 struct ata_dmasetprd_args *args = xsc; 200 struct ata_dma_prdentry *prd = args->dmatab; 201 int i; 202 203 if ((args->error = error)) 204 return; 205 206 for (i = 0; i < nsegs; i++) { 207 prd[i].addr = htole32(segs[i].ds_addr); 208 prd[i].count = htole32(segs[i].ds_len); 209 } 210 prd[i - 1].count |= htole32(ATA_DMA_EOT); 211} 212 213static int 214ata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 215{ 216 struct ata_channel *ch = atadev->channel; 217 struct ata_dmasetprd_args cba; 218 219 if (ch->dma->flags & ATA_DMA_LOADED) { 220 ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 221 return -1; 222 } 223 if (!count) { 224 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 225 return -1; 226 } 227 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 228 (count & (ch->dma->alignment - 1))) { 229 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 230 return -1; 231 } 232 if (count > ch->dma->max_iosize) { 233 ata_prtdev(atadev, 234 "FAILURE - oversized DMA transfer attempted %d > %d\n", 235 count, ch->dma->max_iosize); 236 return -1; 237 } 238 239 cba.dmatab = ch->dma->dmatab; 240 241 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 242 243 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 244 ch->dma->setprd, &cba, 0) || cba.error) 245 return -1; 246 247 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 248 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 249 250 ch->dma->cur_iosize = count; 251 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED; 252 return 0; 253} 254 255int 256ata_dmaunload(struct ata_channel *ch) 257{ 258 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 259 260 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 261 (ch->dma->flags & ATA_DMA_READ) != 0 ? 262 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 263 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 264 265 ch->dma->cur_iosize = 0; 266 ch->dma->flags &= ~ATA_DMA_LOADED; 267 return 0; 268} 269