NetBSD/sys/scsi/scsi_ioctl.c

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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/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <sys/scsiio.h>
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#define b_screq b_driver1 /* XXX */
#define b_sc_link b_driver2 /* XXX */
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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.
*/
#ifndef min
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#define min(A,B) ((A<B) ? A : B)
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#endif
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void scsierr __P((struct buf *, int));
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void
scsi_user_done(xs)
struct scsi_xfer *xs;
{
struct buf *bp;
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scsireq_t *screq;
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);
printf("User command with no buf\n");
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return;
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}
screq = bp->b_screq;
if (!screq) { /* Is it one of ours? (the SCSI_USER bit says it is) */
sc_print_addr(xs->sc_link);
printf("User command with no request\n");
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return;
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}
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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;
switch(xs->error) {
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case XS_NOERROR:
SC_DEBUG(xs->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:
SC_DEBUG(xs->sc_link, SDEV_DB3, ("have sense\n"));
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(xs->sc_link);
printf("host adapter code inconsistency\n");
screq->retsts = SCCMD_UNKNOWN;
break;
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case XS_TIMEOUT:
SC_DEBUG(xs->sc_link, SDEV_DB3, ("timeout\n"));
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screq->retsts = SCCMD_TIMEOUT;
break;
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case XS_BUSY:
SC_DEBUG(xs->sc_link, SDEV_DB3, ("busy\n"));
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screq->retsts = SCCMD_BUSY;
break;
default:
sc_print_addr(xs->sc_link);
printf("unknown error category from host adapter code\n");
screq->retsts = SCCMD_UNKNOWN;
break;
}
biodone(bp); /* we're waiting on it in scsi_strategy() */
return; /* it'll free the xs and restart any queue */
}
/* 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(struct buf *bp)
{
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int err;
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struct scsi_link *sc_link = bp->b_sc_link;
scsireq_t *screq;
u_int32 flags = 0;
int s;
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if (!sc_link) {
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printf("user_strat: No link pointer\n");
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scsierr(bp, EINVAL);
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return;
}
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SC_DEBUG(sc_link, SDEV_DB2, ("user_strategy\n"));
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screq = bp->b_screq;
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if (!screq) {
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sc_print_addr(sc_link);
printf("No request block\n");
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scsierr(bp, EINVAL);
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return;
}
/* We're in trouble if physio tried to break up the
* transfer:
*/
if (bp->b_bcount != screq->datalen) {
sc_print_addr(sc_link);
printf("physio split the request.. cannot proceed\n");
scsierr(bp, EIO);
return;
}
if (screq->timeout == 0) {
scsierr(bp, EINVAL);
return;
}
if (screq->cmdlen > sizeof(struct scsi_generic)) {
sc_print_addr(sc_link);
printf("cmdlen too big ");
scsierr(bp, EFAULT);
return;
}
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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err = scsi_scsi_cmd(sc_link,
(struct scsi_generic *)screq->cmd,
screq->cmdlen,
(u_char *)bp->b_un.b_addr,
screq->datalen,
0, /* user must do the retries *//* ignored */
screq->timeout,
bp,
flags | SCSI_USER);
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/* because there is a bp, scsi_scsi_cmd will return immediatly */
if (err) {
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scsierr(bp, err);
return;
}
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SC_DEBUG(sc_link, SDEV_DB3, ("about to sleep\n"));
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s = splbio();
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while (!(bp->b_flags & B_DONE))
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"));
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return;
}
void scsiminphys(struct buf *bp)
{
/*XXX*//* call the adapter's minphys */
}
/*
* 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(struct scsi_link *sc_link, int cmd, caddr_t addr, int f)
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{
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int error = 0;
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int phys;
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SC_DEBUG(sc_link, SDEV_DB2, ("scsi_do_ioctl(0x%x)\n", cmd));
switch(cmd) {
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#ifndef __NetBSD__
case SCIOCCOMMAND:
{
/*
* You won't believe this, but the arg copied in
* from the user space, is on the kernel stack
* for this process, so we can't write
* to it at interrupt time..
* we need to copy it in and out!
* Make a static copy using malloc!
*/
scsireq_t *screq2 = (scsireq_t *)addr;
scsireq_t *screq = (scsireq_t *)addr;
int rwflag = (screq->flags & SCCMD_READ) ? B_READ : B_WRITE;
struct buf *bp;
caddr_t d_addr;
int len;
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if ((unsigned int)screq < KERNBASE) {
screq = malloc(sizeof(scsireq_t),
M_TEMP, M_WAITOK);
bcopy(screq2, screq, sizeof(scsireq_t));
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}
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bp = malloc(sizeof (struct buf), M_TEMP, M_WAITOK);
bzero(bp, sizeof(struct buf));
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d_addr = screq->databuf;
bp->b_bcount = len = screq->datalen;
bp->b_screq = screq;
bp->b_sc_link = sc_link;
if (len) {
/* have data, translate it. (physio)*/
#ifdef __NetBSD__
#error "dev, mincntfn & uio need defining"
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error = physio(scsistrategy, bp, dev, rwflag,
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mincntfn, uio);
#else
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error = physio(scsistrategy, 0, bp, 0, rwflag,
d_addr, &len, curproc);
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#endif
} else {
/* if no data, no need to translate it.. */
bp->b_un.b_addr = 0;
bp->b_dev = -1; /* irrelevant info */
bp->b_flags = 0;
scsistrategy(bp);
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error = bp->b_error;
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}
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free(bp, M_TEMP);
if ((unsigned int)screq2 < KERNBASE) {
bcopy(screq, screq2, sizeof(scsireq_t));
free(screq, M_TEMP);
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}
break;
}
#endif /* !NetBSD */
case SCIOCDEBUG:
{
int level = *((int *)addr);
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SC_DEBUG(sc_link, SDEV_DB3, ("debug set to %d\n", level));
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sc_link->flags &= ~SDEV_DBX; /*clear debug bits */
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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;
error = 0;
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break;
}
case SCIOCREPROBE:
{
extern int scsibus;
struct scsi_addr *sca = (struct scsi_addr *) addr;
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error = scsi_probe_busses(sca->scbus, sca->target, sca->lun);
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break;
}
case SCIOCRECONFIG:
case SCIOCDECONFIG:
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error = EINVAL;
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break;
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;
break;
}
default:
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error = ENOTTY;
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break;
}
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return error;
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}
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void
scsierr(bp, error)
struct buf *bp;
int error;
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{
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bp->b_flags |= B_ERROR;
bp->b_error = error;
biodone(bp);
return;
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}