NetBSD/sys/scsi/scsi_ioctl.c

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/* $NetBSD: scsi_ioctl.c,v 1.24 1997/04/26 22:24:46 augustss Exp $ */
/*
* Copyright (c) 1994 Charles Hannum. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
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/*
* Contributed by HD Associates (hd@world.std.com).
* Copyright (c) 1992, 1993 HD Associates
*
* Berkeley style copyright.
*/
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#include <sys/types.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/systm.h>
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#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/fcntl.h>
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#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <sys/scsiio.h>
struct scsi_ioctl {
LIST_ENTRY(scsi_ioctl) si_list;
struct buf si_bp;
struct uio si_uio;
struct iovec si_iov;
scsireq_t si_screq;
struct scsi_link *si_sc_link;
};
LIST_HEAD(, scsi_ioctl) si_head;
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struct scsi_ioctl *si_get __P((void));
void si_free __P((struct scsi_ioctl *));
struct scsi_ioctl *si_find __P((struct buf *));
void scsistrategy __P((struct buf *));
struct scsi_ioctl *
si_get()
{
struct scsi_ioctl *si;
int s;
si = malloc(sizeof(struct scsi_ioctl), M_TEMP, M_WAITOK);
bzero(si, sizeof(struct scsi_ioctl));
s = splbio();
LIST_INSERT_HEAD(&si_head, si, si_list);
splx(s);
return (si);
}
void
si_free(si)
struct scsi_ioctl *si;
{
int s;
s = splbio();
LIST_REMOVE(si, si_list);
splx(s);
free(si, M_TEMP);
}
struct scsi_ioctl *
si_find(bp)
struct buf *bp;
{
struct scsi_ioctl *si;
int s;
s = splbio();
for (si = si_head.lh_first; si != 0; si = si->si_list.le_next)
if (bp == &si->si_bp)
break;
splx(s);
return (si);
}
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/*
* We let the user interpret his own sense in the generic scsi world.
* This routine is called at interrupt time if the SCSI_USER bit was set
* in the flags passed to scsi_scsi_cmd(). No other completion processing
* takes place, even if we are running over another device driver.
* The lower level routines that call us here, will free the xs and restart
* the device's queue if such exists.
*/
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void
scsi_user_done(xs)
struct scsi_xfer *xs;
{
struct buf *bp;
struct scsi_ioctl *si;
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scsireq_t *screq;
struct scsi_link *sc_link;
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bp = xs->bp;
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if (!bp) { /* ALL user requests must have a buf */
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sc_print_addr(xs->sc_link);
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printf("User command with no buf\n");
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return;
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}
si = si_find(bp);
if (!si) {
sc_print_addr(xs->sc_link);
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printf("User command with no ioctl\n");
return;
}
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screq = &si->si_screq;
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sc_link = si->si_sc_link;
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SC_DEBUG(xs->sc_link, SDEV_DB2, ("user-done\n"));
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screq->retsts = 0;
screq->status = xs->status;
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switch (xs->error) {
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case XS_NOERROR:
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SC_DEBUG(sc_link, SDEV_DB3, ("no error\n"));
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screq->datalen_used = xs->datalen - xs->resid; /* probably rubbish */
screq->retsts = SCCMD_OK;
break;
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case XS_SENSE:
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SC_DEBUG(sc_link, SDEV_DB3, ("have sense\n"));
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screq->senselen_used = min(sizeof(xs->sense), SENSEBUFLEN);
bcopy(&xs->sense, screq->sense, screq->senselen);
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screq->retsts = SCCMD_SENSE;
break;
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case XS_DRIVER_STUFFUP:
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sc_print_addr(sc_link);
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printf("host adapter code inconsistency\n");
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screq->retsts = SCCMD_UNKNOWN;
break;
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case XS_TIMEOUT:
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SC_DEBUG(sc_link, SDEV_DB3, ("timeout\n"));
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screq->retsts = SCCMD_TIMEOUT;
break;
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case XS_BUSY:
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SC_DEBUG(sc_link, SDEV_DB3, ("busy\n"));
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screq->retsts = SCCMD_BUSY;
break;
default:
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sc_print_addr(sc_link);
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printf("unknown error category from host adapter code\n");
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screq->retsts = SCCMD_UNKNOWN;
break;
}
biodone(bp); /* we're waiting on it in scsi_strategy() */
}
/* Pseudo strategy function
* Called by scsi_do_ioctl() via physio/physstrat if there is to
* be data transfered, and directly if there is no data transfer.
*
* Should I reorganize this so it returns to physio instead
* of sleeping in scsiio_scsi_cmd? Is there any advantage, other
* than avoiding the probable duplicate wakeup in iodone? [PD]
*
* No, seems ok to me... [JRE]
* (I don't see any duplicate wakeups)
*
* Can't be used with block devices or raw_read/raw_write directly
* from the cdevsw/bdevsw tables because they couldn't have added
* the screq structure. [JRE]
*/
void
scsistrategy(bp)
struct buf *bp;
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{
struct scsi_ioctl *si;
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scsireq_t *screq;
struct scsi_link *sc_link;
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int error;
int flags = 0;
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int s;
si = si_find(bp);
if (!si) {
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printf("user_strat: No ioctl\n");
error = EINVAL;
goto bad;
}
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screq = &si->si_screq;
sc_link = si->si_sc_link;
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SC_DEBUG(sc_link, SDEV_DB2, ("user_strategy\n"));
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/*
* We're in trouble if physio tried to break up the transfer.
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*/
if (bp->b_bcount != screq->datalen) {
sc_print_addr(sc_link);
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printf("physio split the request.. cannot proceed\n");
error = EIO;
goto bad;
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}
if (screq->timeout == 0) {
error = EINVAL;
goto bad;
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}
if (screq->cmdlen > sizeof(struct scsi_generic)) {
sc_print_addr(sc_link);
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printf("cmdlen too big\n");
error = EFAULT;
goto bad;
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}
if (screq->flags & SCCMD_READ)
flags |= SCSI_DATA_IN;
if (screq->flags & SCCMD_WRITE)
flags |= SCSI_DATA_OUT;
if (screq->flags & SCCMD_TARGET)
flags |= SCSI_TARGET;
if (screq->flags & SCCMD_ESCAPE)
flags |= SCSI_ESCAPE;
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error = scsi_scsi_cmd(sc_link, (struct scsi_generic *)screq->cmd,
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screq->cmdlen, (u_char *)bp->b_data, screq->datalen,
0, /* user must do the retries *//* ignored */
screq->timeout, bp, flags | SCSI_USER | SCSI_NOSLEEP);
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/* because there is a bp, scsi_scsi_cmd will return immediatly */
if (error)
goto bad;
SC_DEBUG(sc_link, SDEV_DB3, ("about to sleep\n"));
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s = splbio();
while ((bp->b_flags & B_DONE) == 0)
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tsleep(bp, PRIBIO, "scistr", 0);
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splx(s);
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SC_DEBUG(sc_link, SDEV_DB3, ("back from sleep\n"));
return;
bad:
bp->b_flags |= B_ERROR;
bp->b_error = error;
biodone(bp);
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}
/*
* Something (e.g. another driver) has called us
* with an sc_link for a target/lun/adapter, and a scsi
* specific ioctl to perform, better try.
* If user-level type command, we must still be running
* in the context of the calling process
*/
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int
scsi_do_ioctl(sc_link, dev, cmd, addr, flag, p)
struct scsi_link *sc_link;
dev_t dev;
u_long cmd;
caddr_t addr;
int flag;
struct proc *p;
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{
int error;
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SC_DEBUG(sc_link, SDEV_DB2, ("scsi_do_ioctl(0x%lx)\n", cmd));
/* Check for the safe-ness of this request. */
switch (cmd) {
case SCIOCIDENTIFY:
break;
case SCIOCCOMMAND:
if ((((scsireq_t *)addr)->flags & SCCMD_READ) == 0 &&
(flag & FWRITE) == 0)
return EBADF;
break;
default:
if ((flag & FWRITE) == 0)
return EBADF;
}
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switch(cmd) {
case SCIOCCOMMAND: {
scsireq_t *screq = (scsireq_t *)addr;
struct scsi_ioctl *si;
int len;
si = si_get();
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si->si_screq = *screq;
si->si_sc_link = sc_link;
len = screq->datalen;
if (len) {
si->si_iov.iov_base = screq->databuf;
si->si_iov.iov_len = len;
si->si_uio.uio_iov = &si->si_iov;
si->si_uio.uio_iovcnt = 1;
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si->si_uio.uio_resid = len;
si->si_uio.uio_offset = 0;
si->si_uio.uio_segflg = UIO_USERSPACE;
si->si_uio.uio_rw =
(screq->flags & SCCMD_READ) ? UIO_READ : UIO_WRITE;
si->si_uio.uio_procp = p;
error = physio(scsistrategy, &si->si_bp, dev,
(screq->flags & SCCMD_READ) ? B_READ : B_WRITE,
sc_link->adapter->scsi_minphys, &si->si_uio);
} else {
/* if no data, no need to translate it.. */
si->si_bp.b_flags = 0;
si->si_bp.b_data = 0;
si->si_bp.b_bcount = 0;
si->si_bp.b_dev = dev;
si->si_bp.b_proc = p;
scsistrategy(&si->si_bp);
error = si->si_bp.b_error;
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}
*screq = si->si_screq;
si_free(si);
return error;
}
case SCIOCDEBUG: {
int level = *((int *)addr);
SC_DEBUG(sc_link, SDEV_DB3, ("debug set to %d\n", level));
sc_link->flags &= ~SDEV_DBX; /* clear debug bits */
if (level & 1)
sc_link->flags |= SDEV_DB1;
if (level & 2)
sc_link->flags |= SDEV_DB2;
if (level & 4)
sc_link->flags |= SDEV_DB3;
if (level & 8)
sc_link->flags |= SDEV_DB4;
return 0;
}
case SCIOCREPROBE: {
struct scsi_addr *sca = (struct scsi_addr *)addr;
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return scsi_probe_busses(sca->scbus, sca->target, sca->lun);
}
case SCIOCRECONFIG:
case SCIOCDECONFIG:
return EINVAL;
case SCIOCIDENTIFY: {
struct scsi_addr *sca = (struct scsi_addr *)addr;
sca->scbus = sc_link->scsibus;
sca->target = sc_link->target;
sca->lun = sc_link->lun;
return 0;
}
default:
return ENOTTY;
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}
#ifdef DIAGNOSTIC
panic("scsi_do_ioctl: impossible");
#endif
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}