/
sd.c
1941 lines (1661 loc) · 50.2 KB
/
sd.c
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/* $NetBSD: sd.c,v 1.335 2022/08/28 10:26:37 mlelstv Exp $ */
/*-
* Copyright (c) 1998, 2003, 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Originally written by Julian Elischer (julian@dialix.oz.au)
* for TRW Financial Systems for use under the MACH(2.5) operating system.
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sd.c,v 1.335 2022/08/28 10:26:37 mlelstv Exp $");
#ifdef _KERNEL_OPT
#include "opt_scsi.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/scsiio.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <dev/scsipi/scsi_spc.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_disk.h>
#include <dev/scsipi/scsi_disk.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/scsipi/scsipi_base.h>
#include <dev/scsipi/sdvar.h>
#include <prop/proplib.h>
#define SDUNIT(dev) DISKUNIT(dev)
#define SDPART(dev) DISKPART(dev)
#define SDMINOR(unit, part) DISKMINOR(unit, part)
#define MAKESDDEV(maj, unit, part) MAKEDISKDEV(maj, unit, part)
#define SDLABELDEV(dev) (MAKESDDEV(major(dev), SDUNIT(dev), RAW_PART))
#define SD_DEFAULT_BLKSIZE 512
static void sdminphys(struct buf *);
static void sdstart(struct scsipi_periph *);
static void sdrestart(void *);
static void sddone(struct scsipi_xfer *, int);
static bool sd_suspend(device_t, const pmf_qual_t *);
static bool sd_shutdown(device_t, int);
static int sd_interpret_sense(struct scsipi_xfer *);
static int sd_diskstart(device_t, struct buf *);
static int sd_dumpblocks(device_t, void *, daddr_t, int);
static void sd_iosize(device_t, int *);
static int sd_lastclose(device_t);
static int sd_firstopen(device_t, dev_t, int, int);
static void sd_label(device_t, struct disklabel *);
static int sd_mode_sense(struct sd_softc *, u_int8_t, void *, size_t, int,
int, int *);
static int sd_mode_select(struct sd_softc *, u_int8_t, void *, size_t, int,
int);
static int sd_validate_blksize(struct scsipi_periph *, int);
static u_int64_t sd_read_capacity(struct scsipi_periph *, int *, int flags);
static int sd_get_simplifiedparms(struct sd_softc *, struct disk_parms *,
int);
static int sd_get_capacity(struct sd_softc *, struct disk_parms *, int);
static int sd_get_parms(struct sd_softc *, struct disk_parms *, int);
static int sd_get_parms_page4(struct sd_softc *, struct disk_parms *,
int);
static int sd_get_parms_page5(struct sd_softc *, struct disk_parms *,
int);
static int sd_flush(struct sd_softc *, int);
static int sd_getcache(struct sd_softc *, int *);
static int sd_setcache(struct sd_softc *, int);
static int sdmatch(device_t, cfdata_t, void *);
static void sdattach(device_t, device_t, void *);
static int sddetach(device_t, int);
static void sd_set_geometry(struct sd_softc *);
CFATTACH_DECL3_NEW(sd, sizeof(struct sd_softc), sdmatch, sdattach, sddetach,
NULL, NULL, NULL, DVF_DETACH_SHUTDOWN);
extern struct cfdriver sd_cd;
static const struct scsipi_inquiry_pattern sd_patterns[] = {
{T_DIRECT, T_FIXED,
"", "", ""},
{T_DIRECT, T_REMOV,
"", "", ""},
{T_OPTICAL, T_FIXED,
"", "", ""},
{T_OPTICAL, T_REMOV,
"", "", ""},
{T_SIMPLE_DIRECT, T_FIXED,
"", "", ""},
{T_SIMPLE_DIRECT, T_REMOV,
"", "", ""},
};
static dev_type_open(sdopen);
static dev_type_close(sdclose);
static dev_type_read(sdread);
static dev_type_write(sdwrite);
static dev_type_ioctl(sdioctl);
static dev_type_strategy(sdstrategy);
static dev_type_dump(sddump);
static dev_type_size(sdsize);
const struct bdevsw sd_bdevsw = {
.d_open = sdopen,
.d_close = sdclose,
.d_strategy = sdstrategy,
.d_ioctl = sdioctl,
.d_dump = sddump,
.d_psize = sdsize,
.d_discard = nodiscard,
.d_cfdriver = &sd_cd,
.d_devtounit = disklabel_dev_unit,
.d_flag = D_DISK | D_MPSAFE
};
const struct cdevsw sd_cdevsw = {
.d_open = sdopen,
.d_close = sdclose,
.d_read = sdread,
.d_write = sdwrite,
.d_ioctl = sdioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_cfdriver = &sd_cd,
.d_devtounit = disklabel_dev_unit,
.d_flag = D_DISK | D_MPSAFE
};
static const struct dkdriver sddkdriver = {
.d_open = sdopen,
.d_close = sdclose,
.d_strategy = sdstrategy,
.d_minphys = sdminphys,
.d_diskstart = sd_diskstart,
.d_dumpblocks = sd_dumpblocks,
.d_iosize = sd_iosize,
.d_firstopen = sd_firstopen,
.d_lastclose = sd_lastclose,
.d_label = sd_label,
};
static const struct scsipi_periphsw sd_switch = {
sd_interpret_sense, /* check our error handler first */
sdstart, /* have a queue, served by this */
NULL, /* have no async handler */
sddone, /* deal with stats at interrupt time */
};
struct sd_mode_sense_data {
/*
* XXX
* We are not going to parse this as-is -- it just has to be large
* enough.
*/
union {
struct scsi_mode_parameter_header_6 small;
struct scsi_mode_parameter_header_10 big;
} header;
struct scsi_general_block_descriptor blk_desc;
union scsi_disk_pages pages;
};
/*
* The routine called by the low level scsi routine when it discovers
* A device suitable for this driver
*/
static int
sdmatch(device_t parent, cfdata_t match,
void *aux)
{
struct scsipibus_attach_args *sa = aux;
int priority;
(void)scsipi_inqmatch(&sa->sa_inqbuf,
sd_patterns, sizeof(sd_patterns) / sizeof(sd_patterns[0]),
sizeof(sd_patterns[0]), &priority);
return (priority);
}
/*
* Attach routine common to atapi & scsi.
*/
static void
sdattach(device_t parent, device_t self, void *aux)
{
struct sd_softc *sd = device_private(self);
struct dk_softc *dksc = &sd->sc_dksc;
struct scsipibus_attach_args *sa = aux;
struct scsipi_periph *periph = sa->sa_periph;
int error, result, dtype;
struct disk_parms *dp = &sd->params;
char pbuf[9];
SC_DEBUG(periph, SCSIPI_DB2, ("sdattach: "));
sd->type = (sa->sa_inqbuf.type & SID_TYPE);
memcpy(sd->name, sa->sa_inqbuf.product, uimin(16, sizeof(sd->name)));
memcpy(sd->typename, sa->sa_inqbuf.product, uimin(16, sizeof(sd->typename)));
if (sd->type == T_SIMPLE_DIRECT)
periph->periph_quirks |= PQUIRK_ONLYBIG | PQUIRK_NOBIGMODESENSE;
switch (SCSIPI_BUSTYPE_TYPE(scsipi_periph_bustype(sa->sa_periph))) {
case SCSIPI_BUSTYPE_SCSI:
dtype = DKTYPE_SCSI;
if (periph->periph_version == 0)
sd->flags |= SDF_ANCIENT;
break;
case SCSIPI_BUSTYPE_ATAPI:
dtype = DKTYPE_ATAPI;
break;
default:
dtype = DKTYPE_UNKNOWN;
break;
}
/* Initialize dk and disk structure. */
dk_init(dksc, self, dtype);
disk_init(&dksc->sc_dkdev, dksc->sc_xname, &sddkdriver);
/* Attach dk and disk subsystems */
dk_attach(dksc);
disk_attach(&dksc->sc_dkdev);
bufq_alloc(&dksc->sc_bufq, BUFQ_DISK_DEFAULT_STRAT, BUFQ_SORT_RAWBLOCK);
callout_init(&sd->sc_callout, 0);
/*
* Store information needed to contact our base driver
*/
sd->sc_periph = periph;
periph->periph_dev = dksc->sc_dev;
periph->periph_switch = &sd_switch;
/*
* Increase our openings to the maximum-per-periph
* supported by the adapter. This will either be
* clamped down or grown by the adapter if necessary.
*/
periph->periph_openings =
SCSIPI_CHAN_MAX_PERIPH(periph->periph_channel);
periph->periph_flags |= PERIPH_GROW_OPENINGS;
/*
* Use the subdriver to request information regarding the drive.
*/
aprint_naive("\n");
aprint_normal("\n");
if (periph->periph_quirks & PQUIRK_START)
(void)scsipi_start(periph, SSS_START, XS_CTL_SILENT);
error = scsipi_test_unit_ready(periph,
XS_CTL_DISCOVERY | XS_CTL_IGNORE_ILLEGAL_REQUEST |
XS_CTL_IGNORE_MEDIA_CHANGE | XS_CTL_SILENT_NODEV);
if (error)
result = SDGP_RESULT_OFFLINE;
else
result = sd_get_parms(sd, &sd->params, XS_CTL_DISCOVERY);
aprint_normal_dev(dksc->sc_dev, "");
switch (result) {
case SDGP_RESULT_OK:
format_bytes(pbuf, sizeof(pbuf),
(u_int64_t)dp->disksize * dp->blksize);
aprint_normal(
"%s, %ld cyl, %ld head, %ld sec, %ld bytes/sect x %llu sectors",
pbuf, dp->cyls, dp->heads, dp->sectors, dp->blksize,
(unsigned long long)dp->disksize);
break;
case SDGP_RESULT_OFFLINE:
aprint_normal("drive offline");
break;
case SDGP_RESULT_UNFORMATTED:
aprint_normal("unformatted media");
break;
#ifdef DIAGNOSTIC
default:
panic("sdattach: unknown result from get_parms");
break;
#endif
}
aprint_normal("\n");
/* Discover wedges on this disk. */
dkwedge_discover(&dksc->sc_dkdev);
/*
* Establish a shutdown hook so that we can ensure that
* our data has actually made it onto the platter at
* shutdown time. Note that this relies on the fact
* that the shutdown hooks at the "leaves" of the device tree
* are run, first (thus guaranteeing that our hook runs before
* our ancestors').
*/
if (!pmf_device_register1(self, sd_suspend, NULL, sd_shutdown))
aprint_error_dev(self, "couldn't establish power handler\n");
}
static int
sddetach(device_t self, int flags)
{
struct sd_softc *sd = device_private(self);
struct dk_softc *dksc = &sd->sc_dksc;
struct scsipi_periph *periph = sd->sc_periph;
struct scsipi_channel *chan = periph->periph_channel;
int bmaj, cmaj, i, mn, rc;
if ((rc = disk_begindetach(&dksc->sc_dkdev, sd_lastclose, self, flags)) != 0)
return rc;
/* locate the major number */
bmaj = bdevsw_lookup_major(&sd_bdevsw);
cmaj = cdevsw_lookup_major(&sd_cdevsw);
/* Nuke the vnodes for any open instances */
for (i = 0; i < MAXPARTITIONS; i++) {
mn = SDMINOR(device_unit(self), i);
vdevgone(bmaj, mn, mn, VBLK);
vdevgone(cmaj, mn, mn, VCHR);
}
/* kill any pending restart */
callout_halt(&sd->sc_callout, NULL);
dk_drain(dksc);
/* Kill off any pending commands. */
mutex_enter(chan_mtx(chan));
scsipi_kill_pending(periph);
mutex_exit(chan_mtx(chan));
bufq_free(dksc->sc_bufq);
/* Delete all of our wedges. */
dkwedge_delall(&dksc->sc_dkdev);
/* Detach from the disk list. */
disk_detach(&dksc->sc_dkdev);
disk_destroy(&dksc->sc_dkdev);
dk_detach(dksc);
callout_destroy(&sd->sc_callout);
pmf_device_deregister(self);
return (0);
}
/*
* Serialized by caller
*/
static int
sd_firstopen(device_t self, dev_t dev, int flag, int fmt)
{
struct sd_softc *sd = device_private(self);
struct scsipi_periph *periph = sd->sc_periph;
struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
int error, silent;
int part, removable;
part = SDPART(dev);
error = scsipi_adapter_addref(adapt);
if (error)
return error;
if ((part == RAW_PART && fmt == S_IFCHR) || (flag & FSILENT))
silent = XS_CTL_SILENT;
else
silent = 0;
/* Check that it is still responding and ok. */
error = scsipi_test_unit_ready(periph,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_MEDIA_CHANGE |
silent);
/*
* Start the pack spinning if necessary. Always allow the
* raw partition to be opened, for raw IOCTLs. Data transfers
* will check for SDEV_MEDIA_LOADED.
*/
if (error == EIO) {
error = scsipi_start(periph, SSS_START, silent);
if (error == EINVAL)
error = EIO;
}
if (error)
goto bad;
removable = (periph->periph_flags & PERIPH_REMOVABLE) != 0;
if (removable) {
/* Lock the pack in. */
error = scsipi_prevent(periph, SPAMR_PREVENT_DT,
XS_CTL_IGNORE_ILLEGAL_REQUEST |
XS_CTL_IGNORE_MEDIA_CHANGE |
XS_CTL_SILENT);
if (error)
goto bad;
}
if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0) {
int param_error;
/*
* Load the physical device parameters.
*
* Note that if media is present but unformatted,
* we allow the open (so that it can be formatted!).
* The drive should refuse real I/O, if the media is
* unformatted.
*/
param_error = sd_get_parms(sd, &sd->params, 0);
if (param_error == SDGP_RESULT_OFFLINE) {
error = ENXIO;
goto bad2;
}
periph->periph_flags |= PERIPH_MEDIA_LOADED;
SC_DEBUG(periph, SCSIPI_DB3, ("Params loaded "));
}
periph->periph_flags |= PERIPH_OPEN;
return 0;
bad2:
if (removable)
scsipi_prevent(periph, SPAMR_ALLOW,
XS_CTL_IGNORE_ILLEGAL_REQUEST |
XS_CTL_IGNORE_MEDIA_CHANGE |
XS_CTL_SILENT);
bad:
scsipi_adapter_delref(adapt);
return error;
}
/*
* open the device. Make sure the partition info is a up-to-date as can be.
*/
static int
sdopen(dev_t dev, int flag, int fmt, struct lwp *l)
{
struct sd_softc *sd;
struct dk_softc *dksc;
struct scsipi_periph *periph;
int unit, part;
int error;
unit = SDUNIT(dev);
sd = device_lookup_private(&sd_cd, unit);
if (sd == NULL)
return (ENXIO);
dksc = &sd->sc_dksc;
if (!device_is_active(dksc->sc_dev))
return (ENODEV);
periph = sd->sc_periph;
part = SDPART(dev);
SC_DEBUG(periph, SCSIPI_DB1,
("sdopen: dev=0x%"PRIx64" (unit %d (of %d), partition %d)\n",
dev, unit, sd_cd.cd_ndevs, SDPART(dev)));
/*
* If any partition is open, but the disk has been invalidated,
* disallow further opens of non-raw partition
*/
if ((periph->periph_flags & (PERIPH_OPEN | PERIPH_MEDIA_LOADED)) ==
PERIPH_OPEN) {
if (part != RAW_PART || fmt != S_IFCHR)
return EIO;
}
error = dk_open(dksc, dev, flag, fmt, l);
SC_DEBUG(periph, SCSIPI_DB3, ("open complete\n"));
return error;
}
/*
* Serialized by caller
*/
static int
sd_lastclose(device_t self)
{
struct sd_softc *sd = device_private(self);
struct dk_softc *dksc = &sd->sc_dksc;
struct scsipi_periph *periph = sd->sc_periph;
struct scsipi_adapter *adapt = periph->periph_channel->chan_adapter;
/*
* If the disk cache needs flushing, and the disk supports
* it, do it now.
*/
if ((sd->flags & SDF_DIRTY) != 0) {
if (sd_flush(sd, 0)) {
aprint_error_dev(dksc->sc_dev,
"cache synchronization failed\n");
sd->flags &= ~SDF_FLUSHING;
} else
sd->flags &= ~(SDF_FLUSHING|SDF_DIRTY);
}
scsipi_wait_drain(periph);
if (periph->periph_flags & PERIPH_REMOVABLE)
scsipi_prevent(periph, SPAMR_ALLOW,
XS_CTL_IGNORE_ILLEGAL_REQUEST |
XS_CTL_IGNORE_NOT_READY |
XS_CTL_SILENT);
periph->periph_flags &= ~PERIPH_OPEN;
scsipi_wait_drain(periph);
scsipi_adapter_delref(adapt);
return 0;
}
/*
* close the device.. only called if we are the LAST occurrence of an open
* device. Convenient now but usually a pain.
*/
static int
sdclose(dev_t dev, int flag, int fmt, struct lwp *l)
{
struct sd_softc *sd;
struct dk_softc *dksc;
int unit;
unit = SDUNIT(dev);
sd = device_lookup_private(&sd_cd, unit);
dksc = &sd->sc_dksc;
return dk_close(dksc, dev, flag, fmt, l);
}
/*
* Actually translate the requested transfer into one the physical driver
* can understand. The transfer is described by a buf and will include
* only one physical transfer.
*/
static void
sdstrategy(struct buf *bp)
{
struct sd_softc *sd = device_lookup_private(&sd_cd, SDUNIT(bp->b_dev));
struct dk_softc *dksc = &sd->sc_dksc;
struct scsipi_periph *periph = sd->sc_periph;
SC_DEBUG(sd->sc_periph, SCSIPI_DB2, ("sdstrategy "));
SC_DEBUG(sd->sc_periph, SCSIPI_DB1,
("%d bytes @ blk %" PRId64 "\n", bp->b_bcount, bp->b_blkno));
/*
* If the device has been made invalid, error out
*/
if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0 ||
!device_is_active(dksc->sc_dev)) {
if (periph->periph_flags & PERIPH_OPEN)
bp->b_error = EIO;
else
bp->b_error = ENODEV;
bp->b_resid = bp->b_bcount;
biodone(bp);
return;
}
dk_strategy(dksc, bp);
}
/*
* Issue single I/O command
*
* Called from dk_start and implicitly from dk_strategy
*/
static int
sd_diskstart(device_t dev, struct buf *bp)
{
struct sd_softc *sd = device_private(dev);
struct scsipi_periph *periph = sd->sc_periph;
struct scsipi_channel *chan = periph->periph_channel;
struct scsipi_rw_16 cmd16;
struct scsipi_rw_10 cmd_big;
struct scsi_rw_6 cmd_small;
struct scsipi_generic *cmdp;
struct scsipi_xfer *xs;
int error, flags, nblks, cmdlen;
int cdb_flags;
bool havefua = !(periph->periph_quirks & PQUIRK_NOFUA);
mutex_enter(chan_mtx(chan));
if (periph->periph_active >= periph->periph_openings) {
error = EAGAIN;
goto out;
}
/*
* there is excess capacity, but a special waits
* It'll need the adapter as soon as we clear out of the
* way and let it run (user level wait).
*/
if (periph->periph_flags & PERIPH_WAITING) {
periph->periph_flags &= ~PERIPH_WAITING;
cv_broadcast(periph_cv_periph(periph));
error = EAGAIN;
goto out;
}
/*
* If the device has become invalid, abort all the
* reads and writes until all files have been closed and
* re-opened.
*/
if (__predict_false(
(periph->periph_flags & PERIPH_MEDIA_LOADED) == 0)) {
error = EIO;
goto out;
}
/*
* Mark the disk dirty so that the cache will be
* flushed on close.
*/
if ((bp->b_flags & B_READ) == 0)
sd->flags |= SDF_DIRTY;
if (sd->params.blksize == DEV_BSIZE)
nblks = bp->b_bcount >> DEV_BSHIFT;
else
nblks = howmany(bp->b_bcount, sd->params.blksize);
/*
* Pass FUA and/or DPO if requested. Must be done before CDB
* selection, as 6-byte CDB doesn't support the flags.
*/
cdb_flags = 0;
if (havefua) {
if (bp->b_flags & B_MEDIA_FUA)
cdb_flags |= SRWB_FUA;
if (bp->b_flags & B_MEDIA_DPO)
cdb_flags |= SRWB_DPO;
}
/*
* Fill out the scsi command. Use the smallest CDB possible
* (6-byte, 10-byte, or 16-byte). If we need FUA or DPO,
* need to use 10-byte or bigger, as the 6-byte doesn't support
* the flags.
*/
if (((bp->b_rawblkno & 0x1fffff) == bp->b_rawblkno) &&
((nblks & 0xff) == nblks) &&
!(periph->periph_quirks & PQUIRK_ONLYBIG) &&
!cdb_flags) {
/* 6-byte CDB */
memset(&cmd_small, 0, sizeof(cmd_small));
cmd_small.opcode = (bp->b_flags & B_READ) ?
SCSI_READ_6_COMMAND : SCSI_WRITE_6_COMMAND;
_lto3b(bp->b_rawblkno, cmd_small.addr);
cmd_small.length = nblks & 0xff;
cmdlen = sizeof(cmd_small);
cmdp = (struct scsipi_generic *)&cmd_small;
} else if ((bp->b_rawblkno & 0xffffffff) == bp->b_rawblkno) {
/* 10-byte CDB */
memset(&cmd_big, 0, sizeof(cmd_big));
cmd_big.opcode = (bp->b_flags & B_READ) ?
READ_10 : WRITE_10;
_lto4b(bp->b_rawblkno, cmd_big.addr);
_lto2b(nblks, cmd_big.length);
cmdlen = sizeof(cmd_big);
cmdp = (struct scsipi_generic *)&cmd_big;
} else {
/* 16-byte CDB */
memset(&cmd16, 0, sizeof(cmd16));
cmd16.opcode = (bp->b_flags & B_READ) ?
READ_16 : WRITE_16;
_lto8b(bp->b_rawblkno, cmd16.addr);
_lto4b(nblks, cmd16.length);
cmdlen = sizeof(cmd16);
cmdp = (struct scsipi_generic *)&cmd16;
}
if (cdb_flags)
cmdp->bytes[0] = cdb_flags;
/*
* Figure out what flags to use.
*/
flags = XS_CTL_NOSLEEP|XS_CTL_ASYNC|XS_CTL_SIMPLE_TAG;
if (bp->b_flags & B_READ)
flags |= XS_CTL_DATA_IN;
else
flags |= XS_CTL_DATA_OUT;
/*
* Call the routine that chats with the adapter.
* Note: we cannot sleep as we may be an interrupt
*/
xs = scsipi_make_xs_locked(periph, cmdp, cmdlen,
(u_char *)bp->b_data, bp->b_bcount,
SDRETRIES, SD_IO_TIMEOUT, bp, flags);
if (__predict_false(xs == NULL)) {
/*
* out of memory. Keep this buffer in the queue, and
* retry later.
*/
callout_reset(&sd->sc_callout, hz / 2, sdrestart, sd);
error = EAGAIN;
goto out;
}
error = scsipi_execute_xs(xs);
/* with a scsipi_xfer preallocated, scsipi_command can't fail */
KASSERT(error == 0);
out:
mutex_exit(chan_mtx(chan));
return error;
}
/*
* Recover I/O request after memory shortage
*
* Called from callout
*/
static void
sdrestart(void *v)
{
struct sd_softc *sd = v;
struct dk_softc *dksc = &sd->sc_dksc;
dk_start(dksc, NULL);
}
/*
* Recover I/O request after memory shortage
*
* Called from scsipi midlayer when resources have been freed
* with channel lock held
*/
static void
sdstart(struct scsipi_periph *periph)
{
struct sd_softc *sd = device_private(periph->periph_dev);
struct dk_softc *dksc = &sd->sc_dksc;
struct scsipi_channel *chan = periph->periph_channel;
/*
* release channel lock as dk_start may need to acquire
* other locks
*
* sdstart is called from scsipi_put_xs and all its callers
* release the lock afterwards. So releasing it here
* doesn't matter.
*/
mutex_exit(chan_mtx(chan));
dk_start(dksc, NULL);
mutex_enter(chan_mtx(chan));
}
static void
sddone(struct scsipi_xfer *xs, int error)
{
struct sd_softc *sd = device_private(xs->xs_periph->periph_dev);
struct dk_softc *dksc = &sd->sc_dksc;
struct buf *bp = xs->bp;
if (sd->flags & SDF_FLUSHING) {
/* Flush completed, no longer dirty. */
sd->flags &= ~(SDF_FLUSHING|SDF_DIRTY);
}
if (bp) {
bp->b_error = error;
bp->b_resid = xs->resid;
if (error) {
/* on a read/write error bp->b_resid is zero, so fix */
bp->b_resid = bp->b_bcount;
}
dk_done(dksc, bp);
/* dk_start is called from scsipi_complete */
}
}
static void
sdminphys(struct buf *bp)
{
struct sd_softc *sd = device_lookup_private(&sd_cd, SDUNIT(bp->b_dev));
struct dk_softc *dksc = &sd->sc_dksc;
long xmax;
/*
* If the device is ancient, we want to make sure that
* the transfer fits into a 6-byte cdb.
*
* XXX Note that the SCSI-I spec says that 256-block transfers
* are allowed in a 6-byte read/write, and are specified
* by setting the "length" to 0. However, we're conservative
* here, allowing only 255-block transfers in case an
* ancient device gets confused by length == 0. A length of 0
* in a 10-byte read/write actually means 0 blocks.
*/
if ((sd->flags & SDF_ANCIENT) &&
((sd->sc_periph->periph_flags &
(PERIPH_REMOVABLE | PERIPH_MEDIA_LOADED)) != PERIPH_REMOVABLE)) {
xmax = dksc->sc_dkdev.dk_geom.dg_secsize * 0xff;
if (bp->b_bcount > xmax)
bp->b_bcount = xmax;
}
scsipi_adapter_minphys(sd->sc_periph->periph_channel, bp);
}
static void
sd_iosize(device_t dev, int *count)
{
struct buf B;
int bmaj;
bmaj = bdevsw_lookup_major(&sd_bdevsw);
B.b_dev = MAKESDDEV(bmaj,device_unit(dev),RAW_PART);
B.b_bcount = *count;
sdminphys(&B);
*count = B.b_bcount;
}
static int
sdread(dev_t dev, struct uio *uio, int ioflag)
{
return (physio(sdstrategy, NULL, dev, B_READ, sdminphys, uio));
}
static int
sdwrite(dev_t dev, struct uio *uio, int ioflag)
{
return (physio(sdstrategy, NULL, dev, B_WRITE, sdminphys, uio));
}
/*
* Perform special action on behalf of the user
* Knows about the internals of this device
*/
static int
sdioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
{
struct sd_softc *sd = device_lookup_private(&sd_cd, SDUNIT(dev));
struct dk_softc *dksc = &sd->sc_dksc;
struct scsipi_periph *periph = sd->sc_periph;
int part = SDPART(dev);
int error;
SC_DEBUG(sd->sc_periph, SCSIPI_DB2, ("sdioctl 0x%lx ", cmd));
/*
* If the device is not valid, some IOCTLs can still be
* handled on the raw partition. Check this here.
*/
if ((periph->periph_flags & PERIPH_MEDIA_LOADED) == 0 &&
part != RAW_PART)
return (EIO);
switch (cmd) {
case DIOCLOCK:
if (periph->periph_flags & PERIPH_REMOVABLE)
return (scsipi_prevent(periph,
(*(int *)addr) ?
SPAMR_PREVENT_DT : SPAMR_ALLOW, 0));
else
return (ENOTTY);
case DIOCEJECT:
if ((periph->periph_flags & PERIPH_REMOVABLE) == 0)
return (ENOTTY);
if (*(int *)addr == 0) {
int pmask = __BIT(part);
/*
* Don't force eject: check that we are the only
* partition open. If so, unlock it.
*/
if (DK_BUSY(dksc, pmask) == 0) {
error = scsipi_prevent(periph, SPAMR_ALLOW,
XS_CTL_IGNORE_NOT_READY);
if (error)
return (error);
} else {
return (EBUSY);
}
}
/* FALLTHROUGH */
case ODIOCEJECT:
return ((periph->periph_flags & PERIPH_REMOVABLE) == 0 ?
ENOTTY : scsipi_start(periph, SSS_STOP|SSS_LOEJ, 0));
case DIOCGCACHE:
return (sd_getcache(sd, (int *) addr));
case DIOCSCACHE:
if ((flag & FWRITE) == 0)
return (EBADF);
return (sd_setcache(sd, *(int *) addr));
case DIOCCACHESYNC:
/*
* XXX Do we really need to care about having a writable
* file descriptor here?
*/
if ((flag & FWRITE) == 0)
return (EBADF);
if (((sd->flags & SDF_DIRTY) != 0 || *(int *)addr != 0)) {
error = sd_flush(sd, 0);
if (error) {
sd->flags &= ~SDF_FLUSHING;
return (error);
}
sd->flags &= ~(SDF_FLUSHING|SDF_DIRTY);