ata-dma.c revision 133637
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 133637 2004-08-13 08:14:27Z 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#define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 63 64struct ata_dc_cb_args { 65 bus_addr_t maddr; 66 int error; 67}; 68 69void 70ata_dmainit(struct ata_channel *ch) 71{ 72 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 73 ch->dma->alloc = ata_dmaalloc; 74 ch->dma->free = ata_dmafree; 75 ch->dma->setprd = ata_dmasetprd; 76 ch->dma->load = ata_dmaload; 77 ch->dma->unload = ata_dmaunload; 78 ch->dma->alignment = 2; 79 ch->dma->max_iosize = 64 * 1024; 80 ch->dma->boundary = 64 * 1024; 81 } 82} 83 84static void 85ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 86{ 87 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 88 89 if (!(cba->error = error)) 90 cba->maddr = segs[0].ds_addr; 91} 92 93static void 94ata_dmaalloc(struct ata_channel *ch) 95{ 96 struct ata_dc_cb_args ccba; 97 98 if (bus_dma_tag_create(NULL, 1, 0, 99 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 100 NULL, NULL, MAXCTLDMASZ, 101 ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 102 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->dmatag)) 103 goto error; 104 105 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 106 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 107 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 108 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 109 goto error; 110 111 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 112 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 113 NULL, NULL, ch->dma->max_iosize, 114 ATA_DMA_ENTRIES, ch->dma->boundary, 115 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 116 goto error; 117 118 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 119 &ch->dma->cdmamap)) 120 goto error; 121 122 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 123 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 124 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 125 goto error; 126 } 127 ch->dma->mdmatab = ccba.maddr; 128 129 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 130 goto error; 131 132 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 133 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 134 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 135 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->wdmatag)) 136 goto error; 137 138 if (bus_dmamem_alloc(ch->dma->wdmatag, (void **)&ch->dma->workspace, 0, 139 &ch->dma->wdmamap)) 140 goto error; 141 142 if (bus_dmamap_load(ch->dma->wdmatag, ch->dma->wdmamap, ch->dma->workspace, 143 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 144 bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap); 145 goto error; 146 } 147 ch->dma->wdmatab = ccba.maddr; 148 149 return; 150 151error: 152 ata_printf(ch, -1, "WARNING - DMA allocation failed, disabling DMA\n"); 153 ata_dmafree(ch); 154 free(ch->dma, M_ATADMA); 155 ch->dma = NULL; 156} 157 158static void 159ata_dmafree(struct ata_channel *ch) 160{ 161 if (ch->dma->wdmatab) { 162 bus_dmamap_unload(ch->dma->wdmatag, ch->dma->wdmamap); 163 bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap); 164 ch->dma->wdmatab = 0; 165 ch->dma->wdmamap = NULL; 166 ch->dma->workspace = NULL; 167 } 168 if (ch->dma->wdmatag) { 169 bus_dma_tag_destroy(ch->dma->wdmatag); 170 ch->dma->wdmatag = NULL; 171 } 172 if (ch->dma->mdmatab) { 173 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 174 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 175 ch->dma->mdmatab = 0; 176 ch->dma->cdmamap = NULL; 177 ch->dma->dmatab = NULL; 178 } 179 if (ch->dma->ddmamap) { 180 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 181 ch->dma->ddmamap = NULL; 182 } 183 if (ch->dma->cdmatag) { 184 bus_dma_tag_destroy(ch->dma->cdmatag); 185 ch->dma->cdmatag = NULL; 186 } 187 if (ch->dma->ddmatag) { 188 bus_dma_tag_destroy(ch->dma->ddmatag); 189 ch->dma->ddmatag = NULL; 190 } 191 if (ch->dma->dmatag) { 192 bus_dma_tag_destroy(ch->dma->dmatag); 193 ch->dma->dmatag = NULL; 194 } 195} 196 197static void 198ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 199{ 200 struct ata_dmasetprd_args *args = xsc; 201 struct ata_dma_prdentry *prd = args->dmatab; 202 int i; 203 204 if ((args->error = error)) 205 return; 206 207 for (i = 0; i < nsegs; i++) { 208 prd[i].addr = htole32(segs[i].ds_addr); 209 prd[i].count = htole32(segs[i].ds_len); 210 } 211 prd[i - 1].count |= htole32(ATA_DMA_EOT); 212} 213 214static int 215ata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 216{ 217 struct ata_channel *ch = atadev->channel; 218 struct ata_dmasetprd_args cba; 219 220 if (ch->dma->flags & ATA_DMA_LOADED) { 221 ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 222 return -1; 223 } 224 if (!count) { 225 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 226 return -1; 227 } 228 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 229 (count & (ch->dma->alignment - 1))) { 230 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 231 return -1; 232 } 233 if (count > ch->dma->max_iosize) { 234 ata_prtdev(atadev, 235 "FAILURE - oversized DMA transfer attempted %d > %d\n", 236 count, ch->dma->max_iosize); 237 return -1; 238 } 239 240 cba.dmatab = ch->dma->dmatab; 241 242 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 243 244 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 245 ch->dma->setprd, &cba, 0) || cba.error) 246 return -1; 247 248 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 249 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 250 251 ch->dma->cur_iosize = count; 252 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED; 253 return 0; 254} 255 256int 257ata_dmaunload(struct ata_channel *ch) 258{ 259 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 260 261 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 262 (ch->dma->flags & ATA_DMA_READ) != 0 ? 263 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 264 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 265 266 ch->dma->cur_iosize = 0; 267 ch->dma->flags &= ~ATA_DMA_LOADED; 268 return 0; 269} 270