| Current Path : /usr/src/sys/dev/ata/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sys/dev/ata/ata-dma.c |
/*-
* Copyright (c) 1998 - 2008 Søren Schmidt <sos@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/ata/ata-dma.c 219336 2011-03-06 12:54:00Z marius $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ata.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/sema.h>
#include <sys/taskqueue.h>
#include <vm/uma.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/ata/ata-all.h>
/* prototypes */
static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
static void ata_dmaalloc(device_t dev);
static void ata_dmafree(device_t dev);
static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs);
static int ata_dmaunload(struct ata_request *request);
/* local vars */
static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA");
/* misc defines */
#define MAXTABSZ PAGE_SIZE
#define MAXWSPCSZ PAGE_SIZE*2
struct ata_dc_cb_args {
bus_addr_t maddr;
int error;
};
void
ata_dmainit(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
struct ata_dc_cb_args dcba;
if (ch->dma.alloc == NULL)
ch->dma.alloc = ata_dmaalloc;
if (ch->dma.free == NULL)
ch->dma.free = ata_dmafree;
if (ch->dma.setprd == NULL)
ch->dma.setprd = ata_dmasetprd;
if (ch->dma.load == NULL)
ch->dma.load = ata_dmaload;
if (ch->dma.unload == NULL)
ch->dma.unload = ata_dmaunload;
if (ch->dma.alignment == 0)
ch->dma.alignment = 2;
if (ch->dma.boundary == 0)
ch->dma.boundary = 65536;
if (ch->dma.segsize == 0)
ch->dma.segsize = 65536;
if (ch->dma.max_iosize == 0)
ch->dma.max_iosize = MIN((ATA_DMA_ENTRIES - 1) * PAGE_SIZE, MAXPHYS);
if (ch->dma.max_address == 0)
ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT;
if (ch->dma.dma_slots == 0)
ch->dma.dma_slots = 1;
if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0,
ch->dma.max_address, BUS_SPACE_MAXADDR,
NULL, NULL, ch->dma.max_iosize,
ATA_DMA_ENTRIES, ch->dma.segsize,
0, NULL, NULL, &ch->dma.dmatag))
goto error;
if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024,
ch->dma.max_address, BUS_SPACE_MAXADDR,
NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
0, NULL, NULL, &ch->dma.work_tag))
goto error;
if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work,
BUS_DMA_WAITOK | BUS_DMA_COHERENT,
&ch->dma.work_map))
goto error;
if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) ||
dcba.error) {
bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
goto error;
}
ch->dma.work_bus = dcba.maddr;
return;
error:
device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n");
ata_dmafini(dev);
}
void
ata_dmafini(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
if (ch->dma.work_bus) {
bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map);
bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
ch->dma.work_bus = 0;
ch->dma.work_map = NULL;
ch->dma.work = NULL;
}
if (ch->dma.work_tag) {
bus_dma_tag_destroy(ch->dma.work_tag);
ch->dma.work_tag = NULL;
}
if (ch->dma.dmatag) {
bus_dma_tag_destroy(ch->dma.dmatag);
ch->dma.dmatag = NULL;
}
}
static void
ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc;
if (!(dcba->error = error))
dcba->maddr = segs[0].ds_addr;
}
static void
ata_dmaalloc(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
struct ata_dc_cb_args dcba;
int i;
/* alloc and setup needed dma slots */
bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS);
for (i = 0; i < ch->dma.dma_slots; i++) {
struct ata_dmaslot *slot = &ch->dma.slot[i];
if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE,
ch->dma.max_address, BUS_SPACE_MAXADDR,
NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE,
0, NULL, NULL, &slot->sg_tag)) {
device_printf(ch->dev, "FAILURE - create sg_tag\n");
goto error;
}
if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, BUS_DMA_WAITOK,
&slot->sg_map)) {
device_printf(ch->dev, "FAILURE - alloc sg_map\n");
goto error;
}
if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ,
ata_dmasetupc_cb, &dcba, 0) || dcba.error) {
device_printf(ch->dev, "FAILURE - load sg\n");
goto error;
}
slot->sg_bus = dcba.maddr;
if (bus_dma_tag_create(ch->dma.dmatag,
ch->dma.alignment, ch->dma.boundary,
ch->dma.max_address, BUS_SPACE_MAXADDR,
NULL, NULL, ch->dma.max_iosize,
ATA_DMA_ENTRIES, ch->dma.segsize,
BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) {
device_printf(ch->dev, "FAILURE - create data_tag\n");
goto error;
}
if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) {
device_printf(ch->dev, "FAILURE - create data_map\n");
goto error;
}
}
return;
error:
device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
ata_dmafree(dev);
}
static void
ata_dmafree(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
int i;
/* free all dma slots */
for (i = 0; i < ATA_DMA_SLOTS; i++) {
struct ata_dmaslot *slot = &ch->dma.slot[i];
if (slot->sg_bus) {
bus_dmamap_unload(slot->sg_tag, slot->sg_map);
slot->sg_bus = 0;
}
if (slot->sg_map) {
bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map);
bus_dmamap_destroy(slot->sg_tag, slot->sg_map);
slot->sg = NULL;
slot->sg_map = NULL;
}
if (slot->data_map) {
bus_dmamap_destroy(slot->data_tag, slot->data_map);
slot->data_map = NULL;
}
if (slot->sg_tag) {
bus_dma_tag_destroy(slot->sg_tag);
slot->sg_tag = NULL;
}
if (slot->data_tag) {
bus_dma_tag_destroy(slot->data_tag);
slot->data_tag = NULL;
}
}
}
static void
ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ata_dmasetprd_args *args = xsc;
struct ata_dma_prdentry *prd = args->dmatab;
int i;
if ((args->error = error))
return;
for (i = 0; i < nsegs; i++) {
prd[i].addr = htole32(segs[i].ds_addr);
prd[i].count = htole32(segs[i].ds_len);
}
prd[i - 1].count |= htole32(ATA_DMA_EOT);
KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n"));
args->nsegs = nsegs;
}
static int
ata_dmaload(struct ata_request *request, void *addr, int *entries)
{
struct ata_channel *ch = device_get_softc(request->parent);
struct ata_dmasetprd_args dspa;
int error;
ATA_DEBUG_RQ(request, "dmaload");
if (request->dma) {
device_printf(request->parent,
"FAILURE - already active DMA on this device\n");
return EIO;
}
if (!request->bytecount) {
device_printf(request->parent,
"FAILURE - zero length DMA transfer attempted\n");
return EIO;
}
if (request->bytecount & (ch->dma.alignment - 1)) {
device_printf(request->parent,
"FAILURE - odd-sized DMA transfer attempt %d %% %d\n",
request->bytecount, ch->dma.alignment);
return EIO;
}
if (request->bytecount > ch->dma.max_iosize) {
device_printf(request->parent,
"FAILURE - oversized DMA transfer attempt %d > %d\n",
request->bytecount, ch->dma.max_iosize);
return EIO;
}
/* set our slot. XXX SOS NCQ will change that */
request->dma = &ch->dma.slot[0];
if (addr)
dspa.dmatab = addr;
else
dspa.dmatab = request->dma->sg;
if ((error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map,
request->data, request->bytecount,
ch->dma.setprd, &dspa, BUS_DMA_NOWAIT)) ||
(error = dspa.error)) {
device_printf(request->parent, "FAILURE - load data\n");
goto error;
}
if (entries)
*entries = dspa.nsegs;
bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
(request->flags & ATA_R_READ) ?
BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
return 0;
error:
ata_dmaunload(request);
return EIO;
}
int
ata_dmaunload(struct ata_request *request)
{
ATA_DEBUG_RQ(request, "dmaunload");
if (request->dma) {
bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
(request->flags & ATA_R_READ) ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(request->dma->data_tag, request->dma->data_map);
request->dma = NULL;
}
return 0;
}