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/* $OpenBSD: softraid_raid0.c,v 1.1 2008/01/19 23:53:53 marco Exp $ */
/*
* Copyright (c) 2008 Marco Peereboom <marco@peereboom.us>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bio.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/disk.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/mount.h>
#include <sys/sensors.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_disk.h>
#include <dev/softraidvar.h>
#include <dev/rndvar.h>
/* RAID 0 functions */
int
sr_raid0_alloc_resources(struct sr_discipline *sd)
{
int rv = EINVAL;
if (!sd)
return (rv);
DNPRINTF(SR_D_DIS, "%s: sr_raid0_alloc_resources\n",
DEVNAME(sd->sd_sc));
if (sr_alloc_wu(sd))
goto bad;
if (sr_alloc_ccb(sd))
goto bad;
/* setup runtime values */
sd->mds.mdd_raid0.sr0_stripbits =
sr_validate_stripsize(sd->sd_vol.sv_meta.svm_strip_size);
if (sd->mds.mdd_raid0.sr0_stripbits == -1)
goto bad;
rv = 0;
bad:
return (rv);
}
int
sr_raid0_free_resources(struct sr_discipline *sd)
{
int rv = EINVAL;
if (!sd)
return (rv);
DNPRINTF(SR_D_DIS, "%s: sr_raid0_free_resources\n",
DEVNAME(sd->sd_sc));
sr_free_wu(sd);
sr_free_ccb(sd);
if (sd->sd_meta)
free(sd->sd_meta, M_DEVBUF);
rv = 0;
return (rv);
}
int
sr_raid0_rw(struct sr_workunit *wu)
{
struct sr_discipline *sd = wu->swu_dis;
struct scsi_xfer *xs = wu->swu_xs;
struct sr_workunit *wup;
int s;
daddr64_t blk;
DNPRINTF(SR_D_DIS, "%s: sr_raid0_rw 0x%02x\n", DEVNAME(sd->sd_sc),
xs->cmd->opcode);
/* XXX don't do io yet */
goto bad;
if (sd->sd_vol.sv_meta.svm_status == BIOC_SVOFFLINE) {
DNPRINTF(SR_D_DIS, "%s: sr_raid0_rw device offline\n",
DEVNAME(sd->sd_sc));
goto bad;
}
if (xs->datalen == 0) {
printf("%s: %s: illegal block count\n",
DEVNAME(sd->sd_sc), sd->sd_vol.sv_meta.svm_devname);
goto bad;
}
if (xs->cmdlen == 10)
blk = _4btol(((struct scsi_rw_big *)xs->cmd)->addr);
else if (xs->cmdlen == 6)
blk = _3btol(((struct scsi_rw *)xs->cmd)->addr);
else {
printf("%s: %s: illegal cmdlen\n", DEVNAME(sd->sd_sc),
sd->sd_vol.sv_meta.svm_devname);
goto bad;
}
wu->swu_blk_start = blk;
wu->swu_blk_end = blk + (xs->datalen >> 9) - 1;
if (wu->swu_blk_end > sd->sd_vol.sv_meta.svm_size) {
DNPRINTF(SR_D_DIS, "%s: sr_raid0_rw out of bounds start: %lld "
"end: %lld length: %d\n", wu->swu_blk_start,
wu->swu_blk_end, xs->datalen);
sd->sd_scsi_sense.error_code = SSD_ERRCODE_CURRENT |
SSD_ERRCODE_VALID;
sd->sd_scsi_sense.flags = SKEY_ILLEGAL_REQUEST;
sd->sd_scsi_sense.add_sense_code = 0x21;
sd->sd_scsi_sense.add_sense_code_qual = 0x00;
sd->sd_scsi_sense.extra_len = 4;
goto bad;
}
/* calculate physical block */
blk += SR_META_SIZE + SR_META_OFFSET;
s = splbio();
/* generate ios */
/* walk queue backwards and fill in collider if we have one */
TAILQ_FOREACH_REVERSE(wup, &sd->sd_wu_pendq, sr_wu_list, swu_link) {
if (wu->swu_blk_end < wup->swu_blk_start ||
wup->swu_blk_end < wu->swu_blk_start)
continue;
/* we have an LBA collision, defer wu */
wu->swu_state = SR_WU_DEFERRED;
if (wup->swu_collider)
/* wu is on deferred queue, append to last wu */
while (wup->swu_collider)
wup = wup->swu_collider;
wup->swu_collider = wu;
TAILQ_INSERT_TAIL(&sd->sd_wu_defq, wu, swu_link);
sd->sd_wu_collisions++;
goto queued;
}
/* start: */
sr_raid_startwu(wu);
queued:
splx(s);
return (0);
bad:
/* wu is unwound by sr_put_wu */
return (1);
}
void
sr_raid0_intr(struct buf *bp)
{
struct sr_ccb *ccb = (struct sr_ccb *)bp;
struct sr_workunit *wu = ccb->ccb_wu;
struct sr_discipline *sd = wu->swu_dis;
struct scsi_xfer *xs = wu->swu_xs;
struct sr_softc *sc = sd->sd_sc;
int s;
DNPRINTF(SR_D_INTR, "%s: sr_intr bp %x xs %x\n",
DEVNAME(sc), bp, xs);
DNPRINTF(SR_D_INTR, "%s: sr_intr: b_bcount: %d b_resid: %d"
" b_flags: 0x%0x block: %lld target: %d\n", DEVNAME(sc),
ccb->ccb_buf.b_bcount, ccb->ccb_buf.b_resid, ccb->ccb_buf.b_flags,
ccb->ccb_buf.b_blkno, ccb->ccb_target);
s = splbio();
if (ccb->ccb_buf.b_flags & B_ERROR) {
DNPRINTF(SR_D_INTR, "%s: i/o error on block %lld target: %d\n",
DEVNAME(sc), ccb->ccb_buf.b_blkno, ccb->ccb_target);
wu->swu_ios_failed++;
ccb->ccb_state = SR_CCB_FAILED;
if (ccb->ccb_target != -1)
sd->sd_set_chunk_state(sd, ccb->ccb_target,
BIOC_SDOFFLINE);
else
panic("%s: invalid target on wu: %p", DEVNAME(sc), wu);
} else {
ccb->ccb_state = SR_CCB_OK;
wu->swu_ios_succeeded++;
}
wu->swu_ios_complete++;
DNPRINTF(SR_D_INTR, "%s: sr_intr: comp: %d count: %d failed: %d\n",
DEVNAME(sc), wu->swu_ios_complete, wu->swu_io_count,
wu->swu_ios_failed);
/* bad: */
xs->error = XS_DRIVER_STUFFUP;
xs->flags |= ITSDONE;
sr_put_wu(wu);
scsi_done(xs);
splx(s);
}
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