void
ghd_waitq_shuffle_up(ccc_t *cccp, gdev_t *gdevp)
{
gcmd_t *gcmdp;
ASSERT(mutex_owned(&cccp->ccc_waitq_mutex));
GDBG_WAITQ(("ghd_waitq_shuffle_up: cccp 0x%p gdevp 0x%p N %ld "
"max %ld\n", cccp, gdevp, GDEV_NACTIVE(gdevp),
GDEV_MAXACTIVE(gdevp)));
for (;;) {
/*
* Now check the device wait queue throttle to see if I can
* shuffle up a request to the HBA wait queue.
*/
if (GDEV_NACTIVE(gdevp) >= GDEV_MAXACTIVE(gdevp)) {
GDBG_WAITQ(("ghd_waitq_shuffle_up: N>MAX gdevp 0x%p\n",
gdevp));
return;
}
/*
* single thread requests while multiple instances
* because the different target drives might have
* conflicting maxactive throttles.
*/
if (gdevp->gd_ninstances > 1 && GDEV_NACTIVE(gdevp) > 0) {
GDBG_WAITQ(("ghd_waitq_shuffle_up: multi gdevp 0x%p\n",
gdevp));
return;
}
/*
* promote the topmost request from the device queue to
* the HBA queue.
*/
if ((gcmdp = L2_remove_head(&GDEV_QHEAD(gdevp))) == NULL) {
/* the device is empty so we're done */
GDBG_WAITQ(("ghd_waitq_shuffle_up: MT gdevp 0x%p\n",
gdevp));
return;
}
L2_add(&GHBA_QHEAD(cccp), &gcmdp->cmd_q, gcmdp);
GDEV_NACTIVE(gdevp)++;
gcmdp->cmd_waitq_level++;
GDBG_WAITQ(("ghd_waitq_shuffle_up: gdevp 0x%p gcmdp 0x%p\n",
gdevp, gcmdp));
}
}
/*ARGSUSED*/
void
ghd_target_free(dev_info_t *hba_dip,
dev_info_t *tgt_dip,
ccc_t *cccp,
gtgt_t *gtgtp)
{
_NOTE(ARGUNUSED(hba_dip,tgt_dip))
gdev_t *gdevp = gtgtp->gt_gdevp;
GDBG_WAITQ(("ghd_target_free(%d,%d) gdevp-0x%p gtgtp 0x%p\n",
gtgtp->gt_target, gtgtp->gt_lun, (void *)gdevp, (void *)gtgtp));
/*
* grab both mutexes so the queue structures
* stay stable while deleting this instance
*/
mutex_enter(&cccp->ccc_hba_mutex);
mutex_enter(&cccp->ccc_waitq_mutex);
ASSERT(gdevp->gd_ninstances > 0);
/*
* remove this per-instance structure from the device list and
* free the memory
*/
GTGT_DEATTACH(gtgtp, gdevp);
kmem_free((caddr_t)gtgtp, gtgtp->gt_size);
if (gdevp->gd_ninstances == 1) {
GDBG_WAITQ(("ghd_target_free: N=1 gdevp 0x%p\n",
(void *)gdevp));
/*
* If there's now just one instance left attached to this
* device then reset the queue's max active value
* from that instance's saved value.
*/
gtgtp = GDEVP2GTGTP(gdevp);
GDEV_MAXACTIVE(gdevp) = gtgtp->gt_maxactive;
} else if (gdevp->gd_ninstances == 0) {
/* else no instances left */
GDBG_WAITQ(("ghd_target_free: N=0 gdevp 0x%p\n",
(void *)gdevp));
/* detach this per-dev-structure from the HBA's dev list */
GDEV_QDETACH(gdevp, cccp);
kmem_free(gdevp, sizeof (*gdevp));
}
#if defined(GHD_DEBUG) || defined(__lint)
else {
/* leave maxactive set to 1 */
GDBG_WAITQ(("ghd_target_free: N>1 gdevp 0x%p\n",
(void *)gdevp));
}
#endif
ghd_waitq_process_and_mutex_exit(cccp);
}
