512a3aa005
data, introduced by r246713. There are two places where ata_request is filled in ATA_CAM: ata_cam_begin_transaction() and ata_cam_request_sense(). In the first case DMA should be done for addresses from the CCB. In second case, DMA should be done to the different address, the address of the sense buffer inside the CCB structure itself.
354 lines
10 KiB
C
354 lines
10 KiB
C
/*-
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* Copyright (c) 1998 - 2008 Søren Schmidt <sos@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ata.h>
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#include <sys/kernel.h>
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#include <sys/endian.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/sema.h>
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#include <sys/taskqueue.h>
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#include <vm/uma.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <dev/ata/ata-all.h>
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/* prototypes */
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static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
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static void ata_dmaalloc(device_t dev);
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static void ata_dmafree(device_t dev);
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static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
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static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs);
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static int ata_dmaunload(struct ata_request *request);
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/* local vars */
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static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA");
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/* misc defines */
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#define MAXTABSZ PAGE_SIZE
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#define MAXWSPCSZ PAGE_SIZE*2
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struct ata_dc_cb_args {
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bus_addr_t maddr;
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int error;
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};
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void
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ata_dmainit(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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struct ata_dc_cb_args dcba;
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if (ch->dma.alloc == NULL)
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ch->dma.alloc = ata_dmaalloc;
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if (ch->dma.free == NULL)
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ch->dma.free = ata_dmafree;
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if (ch->dma.setprd == NULL)
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ch->dma.setprd = ata_dmasetprd;
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if (ch->dma.load == NULL)
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ch->dma.load = ata_dmaload;
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if (ch->dma.unload == NULL)
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ch->dma.unload = ata_dmaunload;
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if (ch->dma.alignment == 0)
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ch->dma.alignment = 2;
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if (ch->dma.boundary == 0)
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ch->dma.boundary = 65536;
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if (ch->dma.segsize == 0)
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ch->dma.segsize = 65536;
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if (ch->dma.max_iosize == 0)
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ch->dma.max_iosize = MIN((ATA_DMA_ENTRIES - 1) * PAGE_SIZE, MAXPHYS);
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if (ch->dma.max_address == 0)
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ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT;
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if (ch->dma.dma_slots == 0)
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ch->dma.dma_slots = 1;
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if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0,
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ch->dma.max_address, BUS_SPACE_MAXADDR,
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NULL, NULL, ch->dma.max_iosize,
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ATA_DMA_ENTRIES, ch->dma.segsize,
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0, NULL, NULL, &ch->dma.dmatag))
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goto error;
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if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, 64 * 1024,
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ch->dma.max_address, BUS_SPACE_MAXADDR,
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NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
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0, NULL, NULL, &ch->dma.work_tag))
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goto error;
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if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work,
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BUS_DMA_WAITOK | BUS_DMA_COHERENT,
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&ch->dma.work_map))
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goto error;
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if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
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MAXWSPCSZ, ata_dmasetupc_cb, &dcba, 0) ||
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dcba.error) {
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bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
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goto error;
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}
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ch->dma.work_bus = dcba.maddr;
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return;
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error:
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device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n");
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ata_dmafini(dev);
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}
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void
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ata_dmafini(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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if (ch->dma.work_bus) {
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bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map);
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bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
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ch->dma.work_bus = 0;
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ch->dma.work_map = NULL;
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ch->dma.work = NULL;
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}
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if (ch->dma.work_tag) {
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bus_dma_tag_destroy(ch->dma.work_tag);
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ch->dma.work_tag = NULL;
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}
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if (ch->dma.dmatag) {
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bus_dma_tag_destroy(ch->dma.dmatag);
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ch->dma.dmatag = NULL;
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}
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}
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static void
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ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
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{
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struct ata_dc_cb_args *dcba = (struct ata_dc_cb_args *)xsc;
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if (!(dcba->error = error))
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dcba->maddr = segs[0].ds_addr;
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}
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static void
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ata_dmaalloc(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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struct ata_dc_cb_args dcba;
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int i;
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/* alloc and setup needed dma slots */
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bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS);
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for (i = 0; i < ch->dma.dma_slots; i++) {
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struct ata_dmaslot *slot = &ch->dma.slot[i];
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if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE,
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ch->dma.max_address, BUS_SPACE_MAXADDR,
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NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE,
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0, NULL, NULL, &slot->sg_tag)) {
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device_printf(ch->dev, "FAILURE - create sg_tag\n");
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goto error;
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}
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if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, BUS_DMA_WAITOK,
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&slot->sg_map)) {
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device_printf(ch->dev, "FAILURE - alloc sg_map\n");
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goto error;
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}
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if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ,
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ata_dmasetupc_cb, &dcba, 0) || dcba.error) {
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device_printf(ch->dev, "FAILURE - load sg\n");
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goto error;
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}
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slot->sg_bus = dcba.maddr;
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if (bus_dma_tag_create(ch->dma.dmatag,
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ch->dma.alignment, ch->dma.boundary,
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ch->dma.max_address, BUS_SPACE_MAXADDR,
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NULL, NULL, ch->dma.max_iosize,
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ATA_DMA_ENTRIES, ch->dma.segsize,
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BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) {
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device_printf(ch->dev, "FAILURE - create data_tag\n");
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goto error;
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}
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if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) {
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device_printf(ch->dev, "FAILURE - create data_map\n");
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goto error;
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}
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}
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return;
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error:
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device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
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ata_dmafree(dev);
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}
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static void
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ata_dmafree(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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int i;
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/* free all dma slots */
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for (i = 0; i < ATA_DMA_SLOTS; i++) {
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struct ata_dmaslot *slot = &ch->dma.slot[i];
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if (slot->sg_bus) {
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bus_dmamap_unload(slot->sg_tag, slot->sg_map);
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slot->sg_bus = 0;
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}
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if (slot->sg_map) {
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bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map);
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bus_dmamap_destroy(slot->sg_tag, slot->sg_map);
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slot->sg = NULL;
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slot->sg_map = NULL;
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}
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if (slot->data_map) {
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bus_dmamap_destroy(slot->data_tag, slot->data_map);
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slot->data_map = NULL;
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}
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if (slot->sg_tag) {
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bus_dma_tag_destroy(slot->sg_tag);
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slot->sg_tag = NULL;
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}
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if (slot->data_tag) {
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bus_dma_tag_destroy(slot->data_tag);
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slot->data_tag = NULL;
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}
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}
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}
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static void
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ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
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{
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struct ata_dmasetprd_args *args = xsc;
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struct ata_dma_prdentry *prd = args->dmatab;
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int i;
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if ((args->error = error))
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return;
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for (i = 0; i < nsegs; i++) {
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prd[i].addr = htole32(segs[i].ds_addr);
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prd[i].count = htole32(segs[i].ds_len);
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}
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prd[i - 1].count |= htole32(ATA_DMA_EOT);
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KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n"));
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args->nsegs = nsegs;
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}
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static int
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ata_dmaload(struct ata_request *request, void *addr, int *entries)
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{
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struct ata_channel *ch = device_get_softc(request->parent);
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struct ata_dmasetprd_args dspa;
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int error;
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ATA_DEBUG_RQ(request, "dmaload");
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if (request->dma) {
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device_printf(request->parent,
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"FAILURE - already active DMA on this device\n");
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return EIO;
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}
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if (!request->bytecount) {
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device_printf(request->parent,
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"FAILURE - zero length DMA transfer attempted\n");
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return EIO;
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}
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if (request->bytecount & (ch->dma.alignment - 1)) {
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device_printf(request->parent,
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"FAILURE - odd-sized DMA transfer attempt %d %% %d\n",
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request->bytecount, ch->dma.alignment);
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return EIO;
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}
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if (request->bytecount > ch->dma.max_iosize) {
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device_printf(request->parent,
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"FAILURE - oversized DMA transfer attempt %d > %d\n",
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request->bytecount, ch->dma.max_iosize);
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return EIO;
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}
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/* set our slot. XXX SOS NCQ will change that */
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request->dma = &ch->dma.slot[0];
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if (addr)
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dspa.dmatab = addr;
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else
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dspa.dmatab = request->dma->sg;
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#ifdef ATA_CAM
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if (request->flags & ATA_R_DATA_IN_CCB)
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error = bus_dmamap_load_ccb(request->dma->data_tag,
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request->dma->data_map, request->ccb,
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ch->dma.setprd, &dspa, BUS_DMA_NOWAIT);
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else
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#endif
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error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map,
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request->data, request->bytecount,
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ch->dma.setprd, &dspa, BUS_DMA_NOWAIT);
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if (error || (error = dspa.error)) {
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device_printf(request->parent, "FAILURE - load data\n");
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goto error;
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}
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if (entries)
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*entries = dspa.nsegs;
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bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
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BUS_DMASYNC_PREWRITE);
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bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
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(request->flags & ATA_R_READ) ?
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BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
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return 0;
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error:
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ata_dmaunload(request);
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return EIO;
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}
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int
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ata_dmaunload(struct ata_request *request)
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{
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ATA_DEBUG_RQ(request, "dmaunload");
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if (request->dma) {
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bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
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BUS_DMASYNC_POSTWRITE);
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bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
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(request->flags & ATA_R_READ) ?
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BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
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bus_dmamap_unload(request->dma->data_tag, request->dma->data_map);
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request->dma = NULL;
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}
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return 0;
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}
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