ata-dma.c revision 196893
145095Ssos/*- 2178067Ssos * Copyright (c) 1998 - 2008 S�ren Schmidt <sos@FreeBSD.org> 345095Ssos * All rights reserved. 445095Ssos * 545095Ssos * Redistribution and use in source and binary forms, with or without 645095Ssos * modification, are permitted provided that the following conditions 745095Ssos * are met: 845095Ssos * 1. Redistributions of source code must retain the above copyright 945095Ssos * notice, this list of conditions and the following disclaimer, 1045095Ssos * without modification, immediately at the beginning of the file. 1145095Ssos * 2. Redistributions in binary form must reproduce the above copyright 1245095Ssos * notice, this list of conditions and the following disclaimer in the 1345095Ssos * documentation and/or other materials provided with the distribution. 1445095Ssos * 1545095Ssos * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1645095Ssos * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1745095Ssos * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1845095Ssos * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1945095Ssos * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2045095Ssos * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2145095Ssos * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2245095Ssos * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2345095Ssos * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2445095Ssos * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2545095Ssos */ 2645095Ssos 27119418Sobrien#include <sys/cdefs.h> 28119418Sobrien__FBSDID("$FreeBSD: head/sys/dev/ata/ata-dma.c 196893 2009-09-06 14:23:26Z mav $"); 29119418Sobrien 3045095Ssos#include <sys/param.h> 3145095Ssos#include <sys/systm.h> 3274302Ssos#include <sys/ata.h> 33111188Ssos#include <sys/kernel.h> 3495533Smike#include <sys/endian.h> 3545095Ssos#include <sys/malloc.h> 36117126Sscottl#include <sys/lock.h> 37124403Ssos#include <sys/sema.h> 38119404Ssos#include <sys/taskqueue.h> 39124534Ssos#include <vm/uma.h> 4045798Ssos#include <sys/bus.h> 4166106Ssos#include <machine/bus.h> 4272106Ssos#include <sys/rman.h> 4345095Ssos#include <dev/ata/ata-all.h> 4445095Ssos 4552067Ssos/* prototypes */ 46178278Ssosstatic void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error); 47178067Ssosstatic void ata_dmaalloc(device_t dev); 48178067Ssosstatic void ata_dmafree(device_t dev); 49178067Ssosstatic void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error); 50178067Ssosstatic int ata_dmaload(struct ata_request *request, void *addr, int *nsegs); 51178067Ssosstatic int ata_dmaunload(struct ata_request *request); 5252067Ssos 53111188Ssos/* local vars */ 54151897Srwatsonstatic MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA"); 55111188Ssos 5652067Ssos/* misc defines */ 57144330Ssos#define MAXTABSZ PAGE_SIZE 58145713Ssos#define MAXWSPCSZ PAGE_SIZE*2 5945720Speter 6093882Ssosstruct ata_dc_cb_args { 6193882Ssos bus_addr_t maddr; 6293882Ssos int error; 6393882Ssos}; 6493882Ssos 65119453Ssosvoid 66145713Ssosata_dmainit(device_t dev) 67111188Ssos{ 68145713Ssos struct ata_channel *ch = device_get_softc(dev); 69178278Ssos struct ata_dc_cb_args dcba; 70145713Ssos 71178067Ssos ch->dma.alloc = ata_dmaalloc; 72178067Ssos ch->dma.free = ata_dmafree; 73178067Ssos ch->dma.setprd = ata_dmasetprd; 74178067Ssos ch->dma.load = ata_dmaload; 75178067Ssos ch->dma.unload = ata_dmaunload; 76178067Ssos ch->dma.alignment = 2; 77178067Ssos ch->dma.boundary = 65536; 78184135Sjhb ch->dma.segsize = 65536; 79178067Ssos ch->dma.max_iosize = 128 * DEV_BSIZE; 80178067Ssos ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT; 81183724Ssos ch->dma.dma_slots = 6; 82178278Ssos 83178278Ssos if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0, 84178278Ssos ch->dma.max_address, BUS_SPACE_MAXADDR, 85178278Ssos NULL, NULL, ch->dma.max_iosize, 86178278Ssos ATA_DMA_ENTRIES, ch->dma.segsize, 87178278Ssos 0, NULL, NULL, &ch->dma.dmatag)) 88178278Ssos goto error; 89178278Ssos 90178278Ssos if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024, 91178278Ssos ch->dma.max_address, BUS_SPACE_MAXADDR, 92178278Ssos NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 93178278Ssos 0, NULL, NULL, &ch->dma.work_tag)) 94178278Ssos goto error; 95178278Ssos 96178278Ssos if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work, 0, 97178278Ssos &ch->dma.work_map)) 98178278Ssos goto error; 99178278Ssos 100178278Ssos if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work, 101178278Ssos MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) || 102178278Ssos dcba.error) { 103178278Ssos bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map); 104178278Ssos goto error; 105178278Ssos } 106178278Ssos ch->dma.work_bus = dcba.maddr; 107178278Ssos return; 108178278Ssos 109178278Ssoserror: 110178278Ssos device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n"); 111178278Ssos ata_dmafini(dev); 112111188Ssos} 113111188Ssos 114178278Ssosvoid 115178278Ssosata_dmafini(device_t dev) 116178278Ssos{ 117178278Ssos struct ata_channel *ch = device_get_softc(dev); 118178278Ssos 119178278Ssos if (ch->dma.work_bus) { 120178278Ssos bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map); 121178278Ssos bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map); 122178278Ssos ch->dma.work_bus = 0; 123178278Ssos ch->dma.work_map = NULL; 124178278Ssos ch->dma.work = NULL; 125178278Ssos } 126178278Ssos if (ch->dma.work_tag) { 127178278Ssos bus_dma_tag_destroy(ch->dma.work_tag); 128178278Ssos ch->dma.work_tag = NULL; 129178278Ssos } 130178278Ssos if (ch->dma.dmatag) { 131178278Ssos bus_dma_tag_destroy(ch->dma.dmatag); 132178278Ssos ch->dma.dmatag = NULL; 133178278Ssos } 134178278Ssos} 135178278Ssos 13693882Ssosstatic void 13793882Ssosata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 13866070Ssos{ 139178067Ssos struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc; 14066070Ssos 141178067Ssos if (!(dcba->error = error)) 142178067Ssos dcba->maddr = segs[0].ds_addr; 14393882Ssos} 14493882Ssos 145119453Ssosstatic void 146145713Ssosata_dmaalloc(device_t dev) 14793882Ssos{ 148145713Ssos struct ata_channel *ch = device_get_softc(dev); 149178067Ssos struct ata_dc_cb_args dcba; 150178278Ssos int i; 15193882Ssos 152178278Ssos /* alloc and setup needed dma slots */ 153178278Ssos bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS); 154178278Ssos for (i = 0; i < ch->dma.dma_slots; i++) { 155178278Ssos struct ata_dmaslot *slot = &ch->dma.slot[i]; 156178278Ssos 157178278Ssos if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE, 158178278Ssos ch->dma.max_address, BUS_SPACE_MAXADDR, 159178278Ssos NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE, 160178278Ssos 0, NULL, NULL, &slot->sg_tag)) { 161178278Ssos device_printf(ch->dev, "FAILURE - create sg_tag\n"); 162178278Ssos goto error; 163178278Ssos } 164178278Ssos 165178278Ssos if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, 166178278Ssos 0, &slot->sg_map)) { 167178278Ssos device_printf(ch->dev, "FAILURE - alloc sg_map\n"); 168178278Ssos goto error; 169178278Ssos } 170178278Ssos 171178278Ssos if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ, 172178278Ssos ata_dmasetupc_cb, &dcba, 0) || dcba.error) { 173178278Ssos device_printf(ch->dev, "FAILURE - load sg\n"); 174178278Ssos goto error; 175178278Ssos } 176178278Ssos slot->sg_bus = dcba.maddr; 177178278Ssos 178178278Ssos if (bus_dma_tag_create(ch->dma.dmatag, 179178278Ssos ch->dma.alignment, ch->dma.boundary, 180178278Ssos ch->dma.max_address, BUS_SPACE_MAXADDR, 181178278Ssos NULL, NULL, ch->dma.max_iosize, 182178278Ssos ATA_DMA_ENTRIES, ch->dma.segsize, 183178278Ssos BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) { 184178278Ssos device_printf(ch->dev, "FAILURE - create data_tag\n"); 185178278Ssos goto error; 186178278Ssos } 187178278Ssos 188178278Ssos if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) { 189178278Ssos device_printf(ch->dev, "FAILURE - create data_map\n"); 190178278Ssos goto error; 191178278Ssos } 192178278Ssos } 193178278Ssos 194119453Ssos return; 19593882Ssos 196119453Ssoserror: 197145713Ssos device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n"); 198145713Ssos ata_dmafree(dev); 19966070Ssos} 20066070Ssos 201111188Ssosstatic void 202145713Ssosata_dmafree(device_t dev) 20345095Ssos{ 204145713Ssos struct ata_channel *ch = device_get_softc(dev); 205178278Ssos int i; 206145713Ssos 207178278Ssos /* free all dma slots */ 208178278Ssos for (i = 0; i < ATA_DMA_SLOTS; i++) { 209178278Ssos struct ata_dmaslot *slot = &ch->dma.slot[i]; 210178278Ssos 211178278Ssos if (slot->sg_bus) { 212178278Ssos bus_dmamap_unload(slot->sg_tag, slot->sg_map); 213178278Ssos slot->sg_bus = 0; 214178278Ssos } 215178278Ssos if (slot->sg_map) { 216178278Ssos bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map); 217178278Ssos bus_dmamap_destroy(slot->sg_tag, slot->sg_map); 218178278Ssos slot->sg = NULL; 219178278Ssos slot->sg_map = NULL; 220178278Ssos } 221178278Ssos if (slot->data_map) { 222178278Ssos bus_dmamap_destroy(slot->data_tag, slot->data_map); 223178278Ssos slot->data_map = NULL; 224178278Ssos } 225178278Ssos if (slot->sg_tag) { 226178278Ssos bus_dma_tag_destroy(slot->sg_tag); 227178278Ssos slot->sg_tag = NULL; 228178278Ssos } 229178278Ssos if (slot->data_tag) { 230178278Ssos bus_dma_tag_destroy(slot->data_tag); 231178278Ssos slot->data_tag = NULL; 232178278Ssos } 233128183Ssos } 23493882Ssos} 23593882Ssos 23693882Ssosstatic void 237133637Ssosata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 23893882Ssos{ 239133637Ssos struct ata_dmasetprd_args *args = xsc; 240133637Ssos struct ata_dma_prdentry *prd = args->dmatab; 241133637Ssos int i; 24293882Ssos 243133637Ssos if ((args->error = error)) 24493882Ssos return; 245133637Ssos 24693882Ssos for (i = 0; i < nsegs; i++) { 247133637Ssos prd[i].addr = htole32(segs[i].ds_addr); 248133637Ssos prd[i].count = htole32(segs[i].ds_len); 24993882Ssos } 250133637Ssos prd[i - 1].count |= htole32(ATA_DMA_EOT); 251173768Skevlo KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n")); 252145818Ssos args->nsegs = nsegs; 25393882Ssos} 25493882Ssos 255111188Ssosstatic int 256178067Ssosata_dmaload(struct ata_request *request, void *addr, int *entries) 25745095Ssos{ 258178067Ssos struct ata_channel *ch = device_get_softc(request->parent); 259178278Ssos struct ata_device *atadev = device_get_softc(request->dev); 260178067Ssos struct ata_dmasetprd_args dspa; 261153142Ssos int error; 26245095Ssos 263178067Ssos ATA_DEBUG_RQ(request, "dmaload"); 264178067Ssos 265178278Ssos if (request->dma) { 266178067Ssos device_printf(request->dev, 267178067Ssos "FAILURE - already active DMA on this device\n"); 268153142Ssos return EIO; 26966070Ssos } 270178067Ssos if (!request->bytecount) { 271178067Ssos device_printf(request->dev, 272178067Ssos "FAILURE - zero length DMA transfer attempted\n"); 273153142Ssos return EIO; 27445095Ssos } 275196893Smav if (request->bytecount & (ch->dma.alignment - 1)) { 276178067Ssos device_printf(request->dev, 277196893Smav "FAILURE - odd-sized DMA transfer attempt %d %% %d\n", 278196893Smav request->bytecount, ch->dma.alignment); 279153142Ssos return EIO; 280121310Ssos } 281178067Ssos if (request->bytecount > ch->dma.max_iosize) { 282178067Ssos device_printf(request->dev, 283178067Ssos "FAILURE - oversized DMA transfer attempt %d > %d\n", 284178067Ssos request->bytecount, ch->dma.max_iosize); 285153142Ssos return EIO; 286119404Ssos } 28745095Ssos 288178278Ssos /* set our slot, unit for simplicity XXX SOS NCQ will change that */ 289178278Ssos request->dma = &ch->dma.slot[atadev->unit]; 290145818Ssos 291178067Ssos if (addr) 292178067Ssos dspa.dmatab = addr; 293178067Ssos else 294178278Ssos dspa.dmatab = request->dma->sg; 295178067Ssos 296178278Ssos if ((error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map, 297178067Ssos request->data, request->bytecount, 298178067Ssos ch->dma.setprd, &dspa, BUS_DMA_NOWAIT)) || 299178067Ssos (error = dspa.error)) { 300178067Ssos device_printf(request->dev, "FAILURE - load data\n"); 301178067Ssos goto error; 302178067Ssos } 303178067Ssos 304178067Ssos if (entries) 305178067Ssos *entries = dspa.nsegs; 306178067Ssos 307178278Ssos bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map, 308178067Ssos BUS_DMASYNC_PREWRITE); 309178278Ssos bus_dmamap_sync(request->dma->data_tag, request->dma->data_map, 310178067Ssos (request->flags & ATA_R_READ) ? 311178067Ssos BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 31295010Ssos return 0; 313178067Ssos 314178067Ssoserror: 315178067Ssos ata_dmaunload(request); 316178067Ssos return EIO; 31745095Ssos} 31845095Ssos 31966070Ssosint 320178067Ssosata_dmaunload(struct ata_request *request) 32145095Ssos{ 322178067Ssos ATA_DEBUG_RQ(request, "dmaunload"); 323119404Ssos 324178278Ssos if (request->dma) { 325178278Ssos bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map, 326145818Ssos BUS_DMASYNC_POSTWRITE); 327178278Ssos bus_dmamap_sync(request->dma->data_tag, request->dma->data_map, 328178067Ssos (request->flags & ATA_R_READ) ? 329145818Ssos BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 330145818Ssos 331178278Ssos bus_dmamap_unload(request->dma->data_tag, request->dma->data_map); 332178278Ssos request->dma = NULL; 333145818Ssos } 334112791Ssos return 0; 33545095Ssos} 336