freebsd-dev/sys/dev/ips/ips_disk.c
Christian Brueffer 022ad82222 Check pointer for NULL before dereferencing it, not after.
PR:		138384
Submitted by:	Patroklos Argyroudis <argp@census-labs.com>
MFC after:	1 week
2009-10-21 15:04:50 +00:00

304 lines
8.2 KiB
C

/*-
* Written by: David Jeffery
* Copyright (c) 2002 Adaptec Inc.
* 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.
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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("$FreeBSD$");
#include <dev/ips/ipsreg.h>
#include <dev/ips/ips.h>
#include <dev/ips/ips_disk.h>
#include <sys/stat.h>
static int ipsd_probe(device_t dev);
static int ipsd_attach(device_t dev);
static int ipsd_detach(device_t dev);
static int ipsd_dump(void *arg, void *virtual, vm_offset_t physical,
off_t offset, size_t length);
static void ipsd_dump_map_sg(void *arg, bus_dma_segment_t *segs, int nsegs,
int error);
static void ipsd_dump_block_complete(ips_command_t *command);
static disk_open_t ipsd_open;
static disk_close_t ipsd_close;
static disk_strategy_t ipsd_strategy;
static device_method_t ipsd_methods[] = {
DEVMETHOD(device_probe, ipsd_probe),
DEVMETHOD(device_attach, ipsd_attach),
DEVMETHOD(device_detach, ipsd_detach),
{ 0, 0 }
};
static driver_t ipsd_driver = {
"ipsd",
ipsd_methods,
sizeof(ipsdisk_softc_t)
};
static devclass_t ipsd_devclass;
DRIVER_MODULE(ipsd, ips, ipsd_driver, ipsd_devclass, 0, 0);
/* handle opening of disk device. It must set up all
information about the geometry and size of the disk */
static int ipsd_open(struct disk *dp)
{
ipsdisk_softc_t *dsc = dp->d_drv1;
dsc->state |= IPS_DEV_OPEN;
DEVICE_PRINTF(2, dsc->dev, "I'm open\n");
return 0;
}
static int ipsd_close(struct disk *dp)
{
ipsdisk_softc_t *dsc = dp->d_drv1;
dsc->state &= ~IPS_DEV_OPEN;
DEVICE_PRINTF(2, dsc->dev, "I'm closed for the day\n");
return 0;
}
/* ipsd_finish is called to clean up and return a completed IO request */
void ipsd_finish(struct bio *iobuf)
{
ipsdisk_softc_t *dsc;
dsc = iobuf->bio_disk->d_drv1;
if (iobuf->bio_flags & BIO_ERROR) {
ipsdisk_softc_t *dsc;
dsc = iobuf->bio_disk->d_drv1;
device_printf(dsc->dev, "iobuf error %d\n", iobuf->bio_error);
} else
iobuf->bio_resid = 0;
biodone(iobuf);
ips_start_io_request(dsc->sc);
}
static void ipsd_strategy(struct bio *iobuf)
{
ipsdisk_softc_t *dsc;
dsc = iobuf->bio_disk->d_drv1;
DEVICE_PRINTF(8,dsc->dev,"in strategy\n");
iobuf->bio_driver1 = (void *)(uintptr_t)dsc->sc->drives[dsc->disk_number].drivenum;
mtx_lock(&dsc->sc->queue_mtx);
bioq_insert_tail(&dsc->sc->queue, iobuf);
ips_start_io_request(dsc->sc);
mtx_unlock(&dsc->sc->queue_mtx);
}
static int ipsd_probe(device_t dev)
{
DEVICE_PRINTF(2,dev, "in probe\n");
device_set_desc(dev, "Logical Drive");
return 0;
}
static int ipsd_attach(device_t dev)
{
device_t adapter;
ipsdisk_softc_t *dsc;
u_int totalsectors;
DEVICE_PRINTF(2,dev, "in attach\n");
dsc = (ipsdisk_softc_t *)device_get_softc(dev);
bzero(dsc, sizeof(ipsdisk_softc_t));
adapter = device_get_parent(dev);
dsc->dev = dev;
dsc->sc = device_get_softc(adapter);
dsc->unit = device_get_unit(dev);
dsc->disk_number = (uintptr_t) device_get_ivars(dev);
dsc->ipsd_disk = disk_alloc();
dsc->ipsd_disk->d_drv1 = dsc;
dsc->ipsd_disk->d_name = "ipsd";
dsc->ipsd_disk->d_maxsize = IPS_MAX_IO_SIZE;
dsc->ipsd_disk->d_open = ipsd_open;
dsc->ipsd_disk->d_close = ipsd_close;
dsc->ipsd_disk->d_strategy = ipsd_strategy;
dsc->ipsd_disk->d_dump = ipsd_dump;
totalsectors = dsc->sc->drives[dsc->disk_number].sector_count;
if ((totalsectors > 0x400000) &&
((dsc->sc->adapter_info.miscflags & 0x8) == 0)) {
dsc->ipsd_disk->d_fwheads = IPS_NORM_HEADS;
dsc->ipsd_disk->d_fwsectors = IPS_NORM_SECTORS;
} else {
dsc->ipsd_disk->d_fwheads = IPS_COMP_HEADS;
dsc->ipsd_disk->d_fwsectors = IPS_COMP_SECTORS;
}
dsc->ipsd_disk->d_sectorsize = IPS_BLKSIZE;
dsc->ipsd_disk->d_mediasize = (off_t)totalsectors * IPS_BLKSIZE;
dsc->ipsd_disk->d_unit = dsc->unit;
dsc->ipsd_disk->d_flags = 0;
disk_create(dsc->ipsd_disk, DISK_VERSION);
device_printf(dev, "Logical Drive (%dMB)\n",
dsc->sc->drives[dsc->disk_number].sector_count >> 11);
return 0;
}
static int ipsd_detach(device_t dev)
{
ipsdisk_softc_t *dsc;
DEVICE_PRINTF(2, dev,"in detach\n");
dsc = (ipsdisk_softc_t *)device_get_softc(dev);
if(dsc->state & IPS_DEV_OPEN)
return (EBUSY);
disk_destroy(dsc->ipsd_disk);
return 0;
}
static int
ipsd_dump(void *arg, void *virtual, vm_offset_t physical, off_t offset,
size_t length)
{
ipsdisk_softc_t *dsc;
ips_softc_t *sc;
ips_command_t *command;
ips_io_cmd *command_struct;
struct disk *dp;
void *va;
off_t off;
size_t len;
int error = 0;
dp = arg;
dsc = dp->d_drv1;
if (dsc == NULL)
return (EINVAL);
sc = dsc->sc;
if (ips_get_free_cmd(sc, &command, 0) != 0) {
printf("ipsd: failed to get cmd for dump\n");
return (ENOMEM);
}
command->data_dmatag = sc->sg_dmatag;
command->callback = ipsd_dump_block_complete;
command_struct = (ips_io_cmd *)command->command_buffer;
command_struct->id = command->id;
command_struct->drivenum= sc->drives[dsc->disk_number].drivenum;
off = offset;
va = virtual;
while (length > 0) {
len =
(length > IPS_MAX_IO_SIZE) ? IPS_MAX_IO_SIZE : length;
command_struct->lba = off / IPS_BLKSIZE;
if (bus_dmamap_load(command->data_dmatag, command->data_dmamap,
va, len, ipsd_dump_map_sg, command, BUS_DMA_NOWAIT) != 0) {
error = EIO;
break;
}
if (COMMAND_ERROR(command)) {
error = EIO;
break;
}
length -= len;
off += len;
va = (uint8_t *)va + len;
}
ips_insert_free_cmd(command->sc, command);
return (error);
}
static void
ipsd_dump_map_sg(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
ips_softc_t *sc;
ips_command_t *command;
ips_sg_element_t *sg_list;
ips_io_cmd *command_struct;
int i, length;
command = (ips_command_t *)arg;
sc = command->sc;
length = 0;
if (error) {
printf("ipsd_dump_map_sg: error %d\n", error);
ips_set_error(command, error);
return;
}
command_struct = (ips_io_cmd *)command->command_buffer;
if (nsegs != 1) {
command_struct->segnum = nsegs;
sg_list = (ips_sg_element_t *)((uint8_t *)
command->command_buffer + IPS_COMMAND_LEN);
for (i = 0; i < nsegs; i++) {
sg_list[i].addr = segs[i].ds_addr;
sg_list[i].len = segs[i].ds_len;
length += segs[i].ds_len;
}
command_struct->buffaddr =
(uint32_t)command->command_phys_addr + IPS_COMMAND_LEN;
command_struct->command = IPS_SG_WRITE_CMD;
} else {
command_struct->buffaddr = segs[0].ds_addr;
length = segs[0].ds_len;
command_struct->segnum = 0;
command_struct->command = IPS_WRITE_CMD;
}
length = (length + IPS_BLKSIZE - 1) / IPS_BLKSIZE;
command_struct->length = length;
bus_dmamap_sync(sc->command_dmatag, command->command_dmamap,
BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(command->data_dmatag, command->data_dmamap,
BUS_DMASYNC_PREWRITE);
sc->ips_issue_cmd(command);
sc->ips_poll_cmd(command);
return;
}
static void
ipsd_dump_block_complete(ips_command_t *command)
{
if (COMMAND_ERROR(command))
printf("ipsd_dump completion error= 0x%x\n",
command->status.value);
bus_dmamap_sync(command->data_dmatag, command->data_dmamap,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(command->data_dmatag, command->data_dmamap);
}