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NetBSD/sys/dev/scsipi/sd.c
enami 5a4b9fcbbf Prevent a process being swapped out during I/O if the data buffer is 
allocated on stack.  This potential problem is noticed by Noriyuki Soda
and the idea and sample code to fix is given by Jason R. Thorpe.
2000-06-09 08:54:19 +00:00

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/* $NetBSD: sd.c,v 1.163 2000/06/09 08:54:26 enami Exp $ */
/*-
* Copyright (c) 1998 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 "opt_scsi.h"
#include "rnd.h"
#include <sys/types.h>
#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/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>
#if NRND > 0
#include <sys/rnd.h>
#endif
#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/sdvar.h>
#include "sd.h" /* NSD_SCSIBUS and NSD_ATAPIBUS come from here */
#ifndef SDOUTSTANDING
#define SDOUTSTANDING 4
#endif
#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))
int sdlock __P((struct sd_softc *));
void sdunlock __P((struct sd_softc *));
void sdminphys __P((struct buf *));
void sdgetdefaultlabel __P((struct sd_softc *, struct disklabel *));
void sdgetdisklabel __P((struct sd_softc *));
void sdstart __P((void *));
void sddone __P((struct scsipi_xfer *));
void sd_shutdown __P((void *));
int sd_reassign_blocks __P((struct sd_softc *, u_long));
int sd_interpret_sense __P((struct scsipi_xfer *));
extern struct cfdriver sd_cd;
struct dkdriver sddkdriver = { sdstrategy };
struct scsipi_device 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 */
};
/*
* The routine called by the low level scsi routine when it discovers
* a device suitable for this driver.
*/
void
sdattach(parent, sd, sc_link, ops)
struct device *parent;
struct sd_softc *sd;
struct scsipi_link *sc_link;
const struct sd_ops *ops;
{
int error, result;
struct disk_parms *dp = &sd->params;
char pbuf[9];
SC_DEBUG(sc_link, SDEV_DB2, ("sdattach: "));
BUFQ_INIT(&sd->buf_queue);
/*
* Store information needed to contact our base driver
*/
sd->sc_link = sc_link;
sd->sc_ops = ops;
sc_link->device = &sd_switch;
sc_link->device_softc = sd;
if (sc_link->openings > SDOUTSTANDING)
sc_link->openings = SDOUTSTANDING;
/*
* Initialize and attach the disk structure.
*/
sd->sc_dk.dk_driver = &sddkdriver;
sd->sc_dk.dk_name = sd->sc_dev.dv_xname;
disk_attach(&sd->sc_dk);
#ifdef __BROKEN_DK_ESTABLISH
dk_establish(&sd->sc_dk, &sd->sc_dev); /* XXX */
#endif
/*
* Use the subdriver to request information regarding
* the drive. We cannot use interrupts yet, so the
* request must specify this.
*/
printf("\n");
error = scsipi_start(sd->sc_link, SSS_START,
XS_CTL_DISCOVERY | XS_CTL_IGNORE_ILLEGAL_REQUEST |
XS_CTL_IGNORE_MEDIA_CHANGE | XS_CTL_SILENT);
if (error)
result = SDGP_RESULT_OFFLINE;
else
result = (*sd->sc_ops->sdo_get_parms)(sd, &sd->params,
XS_CTL_DISCOVERY);
printf("%s: ", sd->sc_dev.dv_xname);
switch (result) {
case SDGP_RESULT_OK:
format_bytes(pbuf, sizeof(pbuf),
(u_int64_t)dp->disksize * dp->blksize);
printf(
"%s, %ld cyl, %ld head, %ld sec, %ld bytes/sect x %ld sectors",
pbuf, dp->cyls, dp->heads, dp->sectors, dp->blksize,
dp->disksize);
break;
case SDGP_RESULT_OFFLINE:
printf("drive offline");
break;
case SDGP_RESULT_UNFORMATTED:
printf("unformatted media");
break;
#ifdef DIAGNOSTIC
default:
panic("sdattach: unknown result from get_parms");
break;
#endif
}
printf("\n");
/*
* 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 hook code puts us at the head of
* the list (thus guaranteeing that our hook runs before
* our ancestors').
*/
if ((sd->sc_sdhook =
shutdownhook_establish(sd_shutdown, sd)) == NULL)
printf("%s: WARNING: unable to establish shutdown hook\n",
sd->sc_dev.dv_xname);
#if NRND > 0
/*
* attach the device into the random source list
*/
rnd_attach_source(&sd->rnd_source, sd->sc_dev.dv_xname,
RND_TYPE_DISK, 0);
#endif
}
int
sdactivate(self, act)
struct device *self;
enum devact act;
{
int rv = 0;
switch (act) {
case DVACT_ACTIVATE:
rv = EOPNOTSUPP;
break;
case DVACT_DEACTIVATE:
/*
* Nothing to do; we key off the device's DVF_ACTIVE.
*/
break;
}
return (rv);
}
int
sddetach(self, flags)
struct device *self;
int flags;
{
struct sd_softc *sd = (struct sd_softc *) self;
struct buf *bp;
int s, bmaj, cmaj, mn;
/* locate the major number */
for (bmaj = 0; bmaj <= nblkdev; bmaj++)
if (bdevsw[bmaj].d_open == sdopen)
break;
for (cmaj = 0; cmaj <= nchrdev; cmaj++)
if (cdevsw[cmaj].d_open == sdopen)
break;
s = splbio();
/* Kill off any queued buffers. */
while ((bp = BUFQ_FIRST(&sd->buf_queue)) != NULL) {
BUFQ_REMOVE(&sd->buf_queue, bp);
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
bp->b_resid = bp->b_bcount;
biodone(bp);
}
/* Kill off any pending commands. */
scsipi_kill_pending(sd->sc_link);
splx(s);
/* Nuke the vnodes for any open instances */
mn = SDMINOR(self->dv_unit, 0);
vdevgone(bmaj, mn, mn + (MAXPARTITIONS - 1), VBLK);
vdevgone(cmaj, mn, mn + (MAXPARTITIONS - 1), VCHR);
/* Detach from the disk list. */
disk_detach(&sd->sc_dk);
/* Get rid of the shutdown hook. */
shutdownhook_disestablish(sd->sc_sdhook);
#if NRND > 0
/* Unhook the entropy source. */
rnd_detach_source(&sd->rnd_source);
#endif
return (0);
}
/*
* Wait interruptibly for an exclusive lock.
*
* XXX
* Several drivers do this; it should be abstracted and made MP-safe.
*/
int
sdlock(sd)
struct sd_softc *sd;
{
int error;
while ((sd->flags & SDF_LOCKED) != 0) {
sd->flags |= SDF_WANTED;
if ((error = tsleep(sd, PRIBIO | PCATCH, "sdlck", 0)) != 0)
return (error);
}
sd->flags |= SDF_LOCKED;
return (0);
}
/*
* Unlock and wake up any waiters.
*/
void
sdunlock(sd)
struct sd_softc *sd;
{
sd->flags &= ~SDF_LOCKED;
if ((sd->flags & SDF_WANTED) != 0) {
sd->flags &= ~SDF_WANTED;
wakeup(sd);
}
}
/*
* open the device. Make sure the partition info is a up-to-date as can be.
*/
int
sdopen(dev, flag, fmt, p)
dev_t dev;
int flag, fmt;
struct proc *p;
{
struct sd_softc *sd;
struct scsipi_link *sc_link;
int unit, part;
int error;
unit = SDUNIT(dev);
if (unit >= sd_cd.cd_ndevs)
return (ENXIO);
sd = sd_cd.cd_devs[unit];
if (sd == NULL)
return (ENXIO);
if ((sd->sc_dev.dv_flags & DVF_ACTIVE) == 0)
return (ENODEV);
sc_link = sd->sc_link;
part = SDPART(dev);
SC_DEBUG(sc_link, SDEV_DB1,
("sdopen: dev=0x%x (unit %d (of %d), partition %d)\n", dev, unit,
sd_cd.cd_ndevs, part));
/*
* If this is the first open of this device, add a reference
* to the adapter.
*/
if (sd->sc_dk.dk_openmask == 0 &&
(error = scsipi_adapter_addref(sc_link)) != 0)
return (error);
if ((error = sdlock(sd)) != 0)
goto bad4;
if ((sc_link->flags & SDEV_OPEN) != 0) {
/*
* If any partition is open, but the disk has been invalidated,
* disallow further opens of non-raw partition
*/
if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0 &&
(part != RAW_PART || fmt != S_IFCHR)) {
error = EIO;
goto bad3;
}
} else {
/* Check that it is still responding and ok. */
error = scsipi_test_unit_ready(sc_link,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_MEDIA_CHANGE |
XS_CTL_IGNORE_NOT_READY);
if (error)
goto bad3;
/*
* Start the pack spinning if necessary. Always allow the
* raw parition to be opened, for raw IOCTLs. Data transfers
* will check for SDEV_MEDIA_LOADED.
*/
error = scsipi_start(sc_link, SSS_START,
XS_CTL_IGNORE_ILLEGAL_REQUEST |
XS_CTL_IGNORE_MEDIA_CHANGE | XS_CTL_SILENT);
if (error) {
if (part != RAW_PART || fmt != S_IFCHR)
goto bad3;
else
goto out;
}
sc_link->flags |= SDEV_OPEN;
/* Lock the pack in. */
error = scsipi_prevent(sc_link, PR_PREVENT,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_MEDIA_CHANGE);
if (error)
goto bad;
if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0) {
sc_link->flags |= SDEV_MEDIA_LOADED;
/*
* 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.
*/
if ((*sd->sc_ops->sdo_get_parms)(sd, &sd->params,
0) == SDGP_RESULT_OFFLINE) {
error = ENXIO;
goto bad2;
}
SC_DEBUG(sc_link, SDEV_DB3, ("Params loaded "));
/* Load the partition info if not already loaded. */
sdgetdisklabel(sd);
SC_DEBUG(sc_link, SDEV_DB3, ("Disklabel loaded "));
}
}
/* Check that the partition exists. */
if (part != RAW_PART &&
(part >= sd->sc_dk.dk_label->d_npartitions ||
sd->sc_dk.dk_label->d_partitions[part].p_fstype == FS_UNUSED)) {
error = ENXIO;
goto bad;
}
out: /* Insure only one open at a time. */
switch (fmt) {
case S_IFCHR:
sd->sc_dk.dk_copenmask |= (1 << part);
break;
case S_IFBLK:
sd->sc_dk.dk_bopenmask |= (1 << part);
break;
}
sd->sc_dk.dk_openmask =
sd->sc_dk.dk_copenmask | sd->sc_dk.dk_bopenmask;
SC_DEBUG(sc_link, SDEV_DB3, ("open complete\n"));
sdunlock(sd);
return (0);
bad2:
sc_link->flags &= ~SDEV_MEDIA_LOADED;
bad:
if (sd->sc_dk.dk_openmask == 0) {
scsipi_prevent(sc_link, PR_ALLOW,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_MEDIA_CHANGE);
sc_link->flags &= ~SDEV_OPEN;
}
bad3:
sdunlock(sd);
bad4:
if (sd->sc_dk.dk_openmask == 0)
scsipi_adapter_delref(sc_link);
return (error);
}
/*
* close the device.. only called if we are the LAST occurence of an open
* device. Convenient now but usually a pain.
*/
int
sdclose(dev, flag, fmt, p)
dev_t dev;
int flag, fmt;
struct proc *p;
{
struct sd_softc *sd = sd_cd.cd_devs[SDUNIT(dev)];
int part = SDPART(dev);
int error;
if ((error = sdlock(sd)) != 0)
return (error);
switch (fmt) {
case S_IFCHR:
sd->sc_dk.dk_copenmask &= ~(1 << part);
break;
case S_IFBLK:
sd->sc_dk.dk_bopenmask &= ~(1 << part);
break;
}
sd->sc_dk.dk_openmask =
sd->sc_dk.dk_copenmask | sd->sc_dk.dk_bopenmask;
if (sd->sc_dk.dk_openmask == 0) {
/*
* If the disk cache needs flushing, and the disk supports
* it, do it now.
*/
if ((sd->flags & SDF_DIRTY) != 0 &&
sd->sc_ops->sdo_flush != NULL) {
if ((*sd->sc_ops->sdo_flush)(sd, 0)) {
printf("%s: cache synchronization failed\n",
sd->sc_dev.dv_xname);
sd->flags &= ~SDF_FLUSHING;
} else
sd->flags &= ~(SDF_FLUSHING|SDF_DIRTY);
}
scsipi_wait_drain(sd->sc_link);
scsipi_prevent(sd->sc_link, PR_ALLOW,
XS_CTL_IGNORE_ILLEGAL_REQUEST | XS_CTL_IGNORE_NOT_READY);
sd->sc_link->flags &= ~SDEV_OPEN;
if (! (sd->sc_link->flags & SDEV_KEEP_LABEL))
sd->sc_link->flags &= ~SDEV_MEDIA_LOADED;
scsipi_wait_drain(sd->sc_link);
scsipi_adapter_delref(sd->sc_link);
}
sdunlock(sd);
return (0);
}
/*
* 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.
*/
void
sdstrategy(bp)
struct buf *bp;
{
struct sd_softc *sd = sd_cd.cd_devs[SDUNIT(bp->b_dev)];
struct disklabel *lp;
daddr_t blkno;
int s;
SC_DEBUG(sd->sc_link, SDEV_DB2, ("sdstrategy "));
SC_DEBUG(sd->sc_link, SDEV_DB1,
("%ld bytes @ blk %d\n", bp->b_bcount, bp->b_blkno));
/*
* If the device has been made invalid, error out
*/
if ((sd->sc_link->flags & SDEV_MEDIA_LOADED) == 0 ||
(sd->sc_dev.dv_flags & DVF_ACTIVE) == 0) {
if (sd->sc_link->flags & SDEV_OPEN)
bp->b_error = EIO;
else
bp->b_error = ENODEV;
goto bad;
}
lp = sd->sc_dk.dk_label;
/*
* The transfer must be a whole number of blocks, offset must not be
* negative.
*/
if ((bp->b_bcount % lp->d_secsize) != 0 ||
bp->b_blkno < 0) {
bp->b_error = EINVAL;
goto bad;
}
/*
* If it's a null transfer, return immediatly
*/
if (bp->b_bcount == 0)
goto done;
/*
* Do bounds checking, adjust transfer. if error, process.
* If end of partition, just return.
*/
if (SDPART(bp->b_dev) != RAW_PART &&
bounds_check_with_label(bp, lp,
(sd->flags & (SDF_WLABEL|SDF_LABELLING)) != 0) <= 0)
goto done;
/*
* Now convert the block number to absolute and put it in
* terms of the device's logical block size.
*/
if (lp->d_secsize >= DEV_BSIZE)
blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE);
else
blkno = bp->b_blkno * (DEV_BSIZE / lp->d_secsize);
if (SDPART(bp->b_dev) != RAW_PART)
blkno += lp->d_partitions[SDPART(bp->b_dev)].p_offset;
bp->b_rawblkno = blkno;
s = splbio();
/*
* Place it in the queue of disk activities for this disk
*/
disksort_blkno(&sd->buf_queue, bp);
/*
* Tell the device to get going on the transfer if it's
* not doing anything, otherwise just wait for completion
*/
sdstart(sd);
splx(s);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*
* Correctly set the buf to indicate a completed xfer
*/
bp->b_resid = bp->b_bcount;
biodone(bp);
}
/*
* sdstart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It dequeues the buf and creates a scsi command to perform the
* transfer in the buf. The transfer request will call scsipi_done
* on completion, which will in turn call this routine again
* so that the next queued transfer is performed.
* The bufs are queued by the strategy routine (sdstrategy)
*
* This routine is also called after other non-queued requests
* have been made of the scsi driver, to ensure that the queue
* continues to be drained.
*
* must be called at the correct (highish) spl level
* sdstart() is called at splbio from sdstrategy and scsipi_done
*/
void
sdstart(v)
void *v;
{
struct sd_softc *sd = v;
struct scsipi_link *sc_link = sd->sc_link;
struct disklabel *lp = sd->sc_dk.dk_label;
struct buf *bp = 0;
struct scsipi_rw_big cmd_big;
#if NSD_SCSIBUS > 0
struct scsi_rw cmd_small;
#endif
struct scsipi_generic *cmdp;
int nblks, cmdlen, error;
SC_DEBUG(sc_link, SDEV_DB2, ("sdstart "));
/*
* Check if the device has room for another command
*/
while (sc_link->active < sc_link->openings) {
/*
* 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 (sc_link->flags & SDEV_WAITING) {
sc_link->flags &= ~SDEV_WAITING;
wakeup((caddr_t)sc_link);
return;
}
/*
* See if there is a buf with work for us to do..
*/
if ((bp = BUFQ_FIRST(&sd->buf_queue)) == NULL)
return;
BUFQ_REMOVE(&sd->buf_queue, bp);
/*
* If the device has become invalid, abort all the
* reads and writes until all files have been closed and
* re-opened
*/
if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0) {
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
bp->b_resid = bp->b_bcount;
biodone(bp);
continue;
}
/*
* We have a buf, now we should make a command.
*/
nblks = howmany(bp->b_bcount, lp->d_secsize);
#if NSD_SCSIBUS > 0
/*
* Fill out the scsi command. If the transfer will
* fit in a "small" cdb, use it.
*/
if (((bp->b_rawblkno & 0x1fffff) == bp->b_rawblkno) &&
((nblks & 0xff) == nblks) && sc_link->type == BUS_SCSI &&
!(sc_link->quirks & SDEV_ONLYBIG)) {
/*
* We can fit in a small cdb.
*/
bzero(&cmd_small, sizeof(cmd_small));
cmd_small.opcode = (bp->b_flags & B_READ) ?
SCSI_READ_COMMAND : SCSI_WRITE_COMMAND;
_lto3b(bp->b_rawblkno, cmd_small.addr);
cmd_small.length = nblks & 0xff;
cmdlen = sizeof(cmd_small);
cmdp = (struct scsipi_generic *)&cmd_small;
} else
#endif
{
/*
* Need a large cdb.
*/
bzero(&cmd_big, sizeof(cmd_big));
cmd_big.opcode = (bp->b_flags & B_READ) ?
READ_BIG : WRITE_BIG;
_lto4b(bp->b_rawblkno, cmd_big.addr);
_lto2b(nblks, cmd_big.length);
cmdlen = sizeof(cmd_big);
cmdp = (struct scsipi_generic *)&cmd_big;
}
/* Instrumentation. */
disk_busy(&sd->sc_dk);
/*
* Mark the disk dirty so that the cache will be
* flushed on close.
*/
if ((bp->b_flags & B_READ) == 0)
sd->flags |= SDF_DIRTY;
/*
* Call the routine that chats with the adapter.
* Note: we cannot sleep as we may be an interrupt
* XXX Really need NOSLEEP?
*/
error = scsipi_command(sc_link, cmdp, cmdlen,
(u_char *)bp->b_data, bp->b_bcount,
SDRETRIES, 60000, bp, XS_CTL_NOSLEEP | XS_CTL_ASYNC |
((bp->b_flags & B_READ) ?
XS_CTL_DATA_IN : XS_CTL_DATA_OUT));
if (error) {
disk_unbusy(&sd->sc_dk, 0);
printf("%s: not queued, error %d\n",
sd->sc_dev.dv_xname, error);
}
}
}
void
sddone(xs)
struct scsipi_xfer *xs;
{
struct sd_softc *sd = xs->sc_link->device_softc;
if (sd->flags & SDF_FLUSHING) {
/* Flush completed, no longer dirty. */
sd->flags &= ~(SDF_FLUSHING|SDF_DIRTY);
}
if (sd->flags & SDF_RESTART) {
sd->flags &= ~SDF_RESTART;
return;
}
if (xs->bp != NULL) {
disk_unbusy(&sd->sc_dk, xs->bp->b_bcount - xs->bp->b_resid);
#if NRND > 0
rnd_add_uint32(&sd->rnd_source, xs->bp->b_rawblkno);
#endif
}
}
void
sdminphys(bp)
struct buf *bp;
{
struct sd_softc *sd = sd_cd.cd_devs[SDUNIT(bp->b_dev)];
long max;
/*
* 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 settng 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) {
max = sd->sc_dk.dk_label->d_secsize * 0xff;
if (bp->b_bcount > max)
bp->b_bcount = max;
}
(*sd->sc_link->adapter->scsipi_minphys)(bp);
}
int
sdread(dev, uio, ioflag)
dev_t dev;
struct uio *uio;
int ioflag;
{
return (physio(sdstrategy, NULL, dev, B_READ, sdminphys, uio));
}
int
sdwrite(dev, uio, ioflag)
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
*/
int
sdioctl(dev, cmd, addr, flag, p)
dev_t dev;
u_long cmd;
caddr_t addr;
int flag;
struct proc *p;
{
struct sd_softc *sd = sd_cd.cd_devs[SDUNIT(dev)];
int part = SDPART(dev);
int error;
SC_DEBUG(sd->sc_link, SDEV_DB2, ("sdioctl 0x%lx ", cmd));
if ((sd->sc_dev.dv_flags & DVF_ACTIVE) == 0)
return (ENODEV);
/*
* If the device is not valid, some IOCTLs can still be
* handled on the raw partition. Check this here.
*/
if ((sd->sc_link->flags & SDEV_MEDIA_LOADED) == 0) {
switch (cmd) {
case DIOCKLABEL:
case DIOCWLABEL:
case DIOCLOCK:
case DIOCEJECT:
case ODIOCEJECT:
case SCIOCIDENTIFY:
case OSCIOCIDENTIFY:
case SCIOCCOMMAND:
case SCIOCDEBUG:
if (part == RAW_PART)
break;
/* FALLTHROUGH */
default:
if ((sd->sc_link->flags & SDEV_OPEN) == 0)
return (ENODEV);
else
return (EIO);
}
}
switch (cmd) {
case DIOCGDINFO:
*(struct disklabel *)addr = *(sd->sc_dk.dk_label);
return (0);
case DIOCGPART:
((struct partinfo *)addr)->disklab = sd->sc_dk.dk_label;
((struct partinfo *)addr)->part =
&sd->sc_dk.dk_label->d_partitions[part];
return (0);
case DIOCWDINFO:
case DIOCSDINFO:
if ((flag & FWRITE) == 0)
return (EBADF);
if ((error = sdlock(sd)) != 0)
return (error);
sd->flags |= SDF_LABELLING;
error = setdisklabel(sd->sc_dk.dk_label,
(struct disklabel *)addr, /*sd->sc_dk.dk_openmask : */0,
sd->sc_dk.dk_cpulabel);
if (error == 0) {
if (cmd == DIOCWDINFO)
error = writedisklabel(SDLABELDEV(dev),
sdstrategy, sd->sc_dk.dk_label,
sd->sc_dk.dk_cpulabel);
}
sd->flags &= ~SDF_LABELLING;
sdunlock(sd);
return (error);
case DIOCKLABEL:
if (*(int *)addr)
sd->sc_link->flags |= SDEV_KEEP_LABEL;
else
sd->sc_link->flags &= ~SDEV_KEEP_LABEL;
return (0);
case DIOCWLABEL:
if ((flag & FWRITE) == 0)
return (EBADF);
if (*(int *)addr)
sd->flags |= SDF_WLABEL;
else
sd->flags &= ~SDF_WLABEL;
return (0);
case DIOCLOCK:
return (scsipi_prevent(sd->sc_link,
(*(int *)addr) ? PR_PREVENT : PR_ALLOW, 0));
case DIOCEJECT:
if ((sd->sc_link->flags & SDEV_REMOVABLE) == 0)
return (ENOTTY);
if (*(int *)addr == 0) {
/*
* Don't force eject: check that we are the only
* partition open. If so, unlock it.
*/
if ((sd->sc_dk.dk_openmask & ~(1 << part)) == 0 &&
sd->sc_dk.dk_bopenmask + sd->sc_dk.dk_copenmask ==
sd->sc_dk.dk_openmask) {
error = scsipi_prevent(sd->sc_link, PR_ALLOW,
XS_CTL_IGNORE_NOT_READY);
if (error)
return (error);
} else {
return (EBUSY);
}
}
/* FALLTHROUGH */
case ODIOCEJECT:
return ((sd->sc_link->flags & SDEV_REMOVABLE) == 0 ? ENOTTY :
scsipi_start(sd->sc_link, SSS_STOP|SSS_LOEJ, 0));
case DIOCGDEFLABEL:
sdgetdefaultlabel(sd, (struct disklabel *)addr);
return (0);
default:
if (part != RAW_PART)
return (ENOTTY);
return (scsipi_do_ioctl(sd->sc_link, dev, cmd, addr, flag, p));
}
#ifdef DIAGNOSTIC
panic("sdioctl: impossible");
#endif
}
void
sdgetdefaultlabel(sd, lp)
struct sd_softc *sd;
struct disklabel *lp;
{
bzero(lp, sizeof(struct disklabel));
lp->d_secsize = sd->params.blksize;
lp->d_ntracks = sd->params.heads;
lp->d_nsectors = sd->params.sectors;
lp->d_ncylinders = sd->params.cyls;
lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
switch (sd->sc_link->type) {
#if NSD_SCSIBUS > 0
case BUS_SCSI:
lp->d_type = DTYPE_SCSI;
break;
#endif
#if NSD_ATAPIBUS > 0
case BUS_ATAPI:
lp->d_type = DTYPE_ATAPI;
break;
#endif
}
strncpy(lp->d_typename, sd->name, 16);
strncpy(lp->d_packname, "fictitious", 16);
lp->d_secperunit = sd->params.disksize;
lp->d_rpm = sd->params.rot_rate;
lp->d_interleave = 1;
lp->d_flags = 0;
lp->d_partitions[RAW_PART].p_offset = 0;
lp->d_partitions[RAW_PART].p_size =
lp->d_secperunit * (lp->d_secsize / DEV_BSIZE);
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
lp->d_npartitions = RAW_PART + 1;
lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;
lp->d_checksum = dkcksum(lp);
}
/*
* Load the label information on the named device
*/
void
sdgetdisklabel(sd)
struct sd_softc *sd;
{
struct disklabel *lp = sd->sc_dk.dk_label;
char *errstring;
bzero(sd->sc_dk.dk_cpulabel, sizeof(struct cpu_disklabel));
sdgetdefaultlabel(sd, lp);
if (lp->d_secpercyl == 0) {
lp->d_secpercyl = 100;
/* as long as it's not 0 - readdisklabel divides by it (?) */
}
/*
* Call the generic disklabel extraction routine
*/
errstring = readdisklabel(MAKESDDEV(0, sd->sc_dev.dv_unit, RAW_PART),
sdstrategy, lp, sd->sc_dk.dk_cpulabel);
if (errstring) {
printf("%s: %s\n", sd->sc_dev.dv_xname, errstring);
return;
}
}
void
sd_shutdown(arg)
void *arg;
{
struct sd_softc *sd = arg;
/*
* If the disk cache needs to be flushed, and the disk supports
* it, flush it. We're cold at this point, so we poll for
* completion.
*/
if ((sd->flags & SDF_DIRTY) != 0 && sd->sc_ops->sdo_flush != NULL) {
if ((*sd->sc_ops->sdo_flush)(sd, XS_CTL_NOSLEEP|XS_CTL_POLL)) {
printf("%s: cache synchronization failed\n",
sd->sc_dev.dv_xname);
sd->flags &= ~SDF_FLUSHING;
} else
sd->flags &= ~(SDF_FLUSHING|SDF_DIRTY);
}
}
/*
* Tell the device to map out a defective block
*/
int
sd_reassign_blocks(sd, blkno)
struct sd_softc *sd;
u_long blkno;
{
struct scsi_reassign_blocks scsipi_cmd;
struct scsi_reassign_blocks_data rbdata;
bzero(&scsipi_cmd, sizeof(scsipi_cmd));
bzero(&rbdata, sizeof(rbdata));
scsipi_cmd.opcode = SCSI_REASSIGN_BLOCKS;
_lto2b(sizeof(rbdata.defect_descriptor[0]), rbdata.length);
_lto4b(blkno, rbdata.defect_descriptor[0].dlbaddr);
return (scsipi_command(sd->sc_link,
(struct scsipi_generic *)&scsipi_cmd, sizeof(scsipi_cmd),
(u_char *)&rbdata, sizeof(rbdata), SDRETRIES, 5000, NULL,
XS_CTL_DATA_OUT | XS_CTL_DATA_ONSTACK));
}
/*
* Check Errors
*/
int
sd_interpret_sense(xs)
struct scsipi_xfer *xs;
{
struct scsipi_link *sc_link = xs->sc_link;
struct scsipi_sense_data *sense = &xs->sense.scsi_sense;
struct sd_softc *sd = sc_link->device_softc;
int retval = SCSIRET_CONTINUE;
/*
* If the device is not open yet, let the generic code handle it.
*/
if ((sc_link->flags & SDEV_MEDIA_LOADED) == 0) {
return (retval);
}
/*
* If it isn't a extended or extended/deferred error, let
* the generic code handle it.
*/
if ((sense->error_code & SSD_ERRCODE) != 0x70 &&
(sense->error_code & SSD_ERRCODE) != 0x71) { /* DEFFERRED */
return (retval);
}
if ((sense->flags & SSD_KEY) == SKEY_NOT_READY &&
sense->add_sense_code == 0x4) {
if (sense->add_sense_code_qual == 0x01) {
printf("%s: ..is spinning up...waiting\n",
sd->sc_dev.dv_xname);
/*
* I really need a sdrestart function I can call here.
*/
delay(1000000 * 5); /* 5 seconds */
retval = SCSIRET_RETRY;
} else if ((sense->add_sense_code_qual == 0x2) &&
(sd->sc_link->quirks & SDEV_NOSTARTUNIT) == 0) {
if (sd->sc_link->flags & SDEV_REMOVABLE) {
printf(
"%s: removable disk stopped - not restarting\n",
sd->sc_dev.dv_xname);
retval = EIO;
} else {
if (sd->flags & SDF_RESTART)
return SCSIRET_RETRY;
sd->flags |= SDF_RESTART;
printf("%s: respinning up disk\n",
sd->sc_dev.dv_xname);
retval = scsipi_start(sd->sc_link, SSS_START,
XS_CTL_URGENT | XS_CTL_NOSLEEP |
((xs->xs_control & XS_CTL_ASYNC) ?
XS_CTL_ASYNC : 0));
if ((xs->xs_control & XS_CTL_ASYNC) == 0)
sd->flags &= ~SDF_RESTART;
if (retval != 0) {
printf(
"%s: respin of disk failed - %d\n",
sd->sc_dev.dv_xname, retval);
retval = EIO;
} else {
retval = SCSIRET_RETRY;
}
}
}
}
return (retval);
}
int
sdsize(dev)
dev_t dev;
{
struct sd_softc *sd;
int part, unit, omask;
int size;
unit = SDUNIT(dev);
if (unit >= sd_cd.cd_ndevs)
return (-1);
sd = sd_cd.cd_devs[unit];
if (sd == NULL)
return (-1);
if ((sd->sc_dev.dv_flags & DVF_ACTIVE) == 0)
return (-1);
part = SDPART(dev);
omask = sd->sc_dk.dk_openmask & (1 << part);
if (omask == 0 && sdopen(dev, 0, S_IFBLK, NULL) != 0)
return (-1);
if ((sd->sc_link->flags & SDEV_MEDIA_LOADED) == 0)
size = -1;
else if (sd->sc_dk.dk_label->d_partitions[part].p_fstype != FS_SWAP)
size = -1;
else
size = sd->sc_dk.dk_label->d_partitions[part].p_size *
(sd->sc_dk.dk_label->d_secsize / DEV_BSIZE);
if (omask == 0 && sdclose(dev, 0, S_IFBLK, NULL) != 0)
return (-1);
return (size);
}
#ifndef __BDEVSW_DUMP_OLD_TYPE
/* #define SD_DUMP_NOT_TRUSTED if you just want to watch */
static struct scsipi_xfer sx;
static int sddoingadump;
/*
* dump all of physical memory into the partition specified, starting
* at offset 'dumplo' into the partition.
*/
int
sddump(dev, blkno, va, size)
dev_t dev;
daddr_t blkno;
caddr_t va;
size_t size;
{
struct sd_softc *sd; /* disk unit to do the I/O */
struct disklabel *lp; /* disk's disklabel */
int unit, part;
int sectorsize; /* size of a disk sector */
int nsects; /* number of sectors in partition */
int sectoff; /* sector offset of partition */
int totwrt; /* total number of sectors left to write */
int nwrt; /* current number of sectors to write */
struct scsipi_rw_big cmd; /* write command */
struct scsipi_xfer *xs; /* ... convenience */
int retval;
/* Check if recursive dump; if so, punt. */
if (sddoingadump)
return (EFAULT);
/* Mark as active early. */
sddoingadump = 1;
unit = SDUNIT(dev); /* Decompose unit & partition. */
part = SDPART(dev);
/* Check for acceptable drive number. */
if (unit >= sd_cd.cd_ndevs || (sd = sd_cd.cd_devs[unit]) == NULL)
return (ENXIO);
if ((sd->sc_dev.dv_flags & DVF_ACTIVE) == 0)
return (ENODEV);
/* Make sure it was initialized. */
if ((sd->sc_link->flags & SDEV_MEDIA_LOADED) != SDEV_MEDIA_LOADED)
return (ENXIO);
/* Convert to disk sectors. Request must be a multiple of size. */
lp = sd->sc_dk.dk_label;
sectorsize = lp->d_secsize;
if ((size % sectorsize) != 0)
return (EFAULT);
totwrt = size / sectorsize;
blkno = dbtob(blkno) / sectorsize; /* blkno in DEV_BSIZE units */
nsects = lp->d_partitions[part].p_size;
sectoff = lp->d_partitions[part].p_offset;
/* Check transfer bounds against partition size. */
if ((blkno < 0) || ((blkno + totwrt) > nsects))
return (EINVAL);
/* Offset block number to start of partition. */
blkno += sectoff;
xs = &sx;
while (totwrt > 0) {
nwrt = totwrt; /* XXX */
#ifndef SD_DUMP_NOT_TRUSTED
/*
* Fill out the scsi command
*/
bzero(&cmd, sizeof(cmd));
cmd.opcode = WRITE_BIG;
_lto4b(blkno, cmd.addr);
_lto2b(nwrt, cmd.length);
/*
* Fill out the scsipi_xfer structure
* Note: we cannot sleep as we may be an interrupt
* don't use scsipi_command() as it may want to wait
* for an xs.
*/
bzero(xs, sizeof(sx));
xs->xs_control |= XS_CTL_NOSLEEP | XS_CTL_POLL |
XS_CTL_DATA_OUT;
xs->xs_status = 0;
xs->sc_link = sd->sc_link;
xs->retries = SDRETRIES;
xs->timeout = 10000; /* 10000 millisecs for a disk ! */
xs->cmd = (struct scsipi_generic *)&cmd;
xs->cmdlen = sizeof(cmd);
xs->resid = nwrt * sectorsize;
xs->error = XS_NOERROR;
xs->bp = 0;
xs->data = va;
xs->datalen = nwrt * sectorsize;
/*
* Pass all this info to the scsi driver.
*/
retval = scsipi_command_direct(xs);
if (retval != COMPLETE)
return (ENXIO);
#else /* SD_DUMP_NOT_TRUSTED */
/* Let's just talk about this first... */
printf("sd%d: dump addr 0x%x, blk %d\n", unit, va, blkno);
delay(500 * 1000); /* half a second */
#endif /* SD_DUMP_NOT_TRUSTED */
/* update block count */
totwrt -= nwrt;
blkno += nwrt;
va += sectorsize * nwrt;
}
sddoingadump = 0;
return (0);
}
#else /* __BDEVSW_DUMP_NEW_TYPE */
int
sddump(dev, blkno, va, size)
dev_t dev;
daddr_t blkno;
caddr_t va;
size_t size;
{
/* Not implemented. */
return (ENXIO);
}
#endif /* __BDEVSW_DUMP_NEW_TYPE */
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