int
ghd_intr(ccc_t *cccp, void *intr_status)
{
int (*statfunc)(void *, void *) = cccp->ccc_get_status;
void (*processfunc)(void *, void *) = cccp->ccc_process_intr;
kmutex_t *waitq_mutexp = &cccp->ccc_waitq_mutex;
kmutex_t *hba_mutexp = &cccp->ccc_hba_mutex;
void *handle = cccp->ccc_hba_handle;
int rc = DDI_INTR_UNCLAIMED;
int more;
mutex_enter(hba_mutexp);
GDBG_INTR(("ghd_intr(): cccp=0x%p status=0x%p\n",
(void *)cccp, intr_status));
for (;;) {
more = FALSE;
/* process the interrupt status */
while ((*statfunc)(handle, intr_status)) {
(*processfunc)(handle, intr_status);
rc = DDI_INTR_CLAIMED;
more = TRUE;
}
mutex_enter(waitq_mutexp);
if (ghd_waitq_process_and_mutex_hold(cccp)) {
ASSERT(mutex_owned(hba_mutexp));
mutex_exit(waitq_mutexp);
continue;
}
if (more) {
mutex_exit(waitq_mutexp);
continue;
}
GDBG_INTR(("ghd_intr(): done cccp=0x%p status=0x%p rc %d\n",
(void *)cccp, intr_status, rc));
/*
* Release the mutexes in the opposite order that they
* were acquired to prevent requests queued by
* ghd_transport() from getting hung up in the wait queue.
*/
mutex_exit(hba_mutexp);
mutex_exit(waitq_mutexp);
return (rc);
}
}
void
ghd_waitq_process_and_mutex_exit(ccc_t *cccp)
{
ASSERT(mutex_owned(&cccp->ccc_hba_mutex));
ASSERT(mutex_owned(&cccp->ccc_waitq_mutex));
GDBG_WAITQ(("ghd_waitq_process_and_mutex_exit: cccp 0x%p\n", cccp));
(void) ghd_waitq_process_and_mutex_hold(cccp);
/*
* Release the mutexes in the opposite order that they
* were acquired to prevent requests queued by
* ghd_transport() from getting hung up in the wait queue.
*/
mutex_exit(&cccp->ccc_hba_mutex);
mutex_exit(&cccp->ccc_waitq_mutex);
}
static int
ghd_poll(ccc_t *cccp,
gpoll_t polltype,
ulong_t polltime,
gcmd_t *poll_gcmdp,
gtgt_t *gtgtp,
void *intr_status)
{
gcmd_t *gcmdp;
L2el_t gcmd_hold_queue;
int got_it = FALSE;
clock_t poll_lbolt;
clock_t start_lbolt;
clock_t current_lbolt;
ASSERT(mutex_owned(&cccp->ccc_hba_mutex));
L2_INIT(&gcmd_hold_queue);
/* Que hora es? */
poll_lbolt = drv_usectohz((clock_t)polltime);
start_lbolt = ddi_get_lbolt();
/* unqueue and save all CMD/CCBs until I find the right one */
while (!got_it) {
/* Give up yet? */
current_lbolt = ddi_get_lbolt();
if (poll_lbolt && (current_lbolt - start_lbolt >= poll_lbolt))
break;
/*
* delay 1 msec each time around the loop (this is an
* arbitrary delay value, any value should work) except
* zero because some devices don't like being polled too
* fast and it saturates the bus on an MP system.
*/
drv_usecwait(1000);
/*
* check for any new device status
*/
if ((*cccp->ccc_get_status)(cccp->ccc_hba_handle, intr_status))
(*cccp->ccc_process_intr)(cccp->ccc_hba_handle,
intr_status);
/*
* If something completed then try to start the
* next request from the wait queue. Don't release
* the HBA mutex because I don't know whether my
* request(s) is/are on the done queue yet.
*/
mutex_enter(&cccp->ccc_waitq_mutex);
(void) ghd_waitq_process_and_mutex_hold(cccp);
mutex_exit(&cccp->ccc_waitq_mutex);
/*
* Process the first of any timed-out requests.
*/
ghd_timer_poll(cccp, GHD_TIMER_POLL_ONE);
/*
* Unqueue all the completed requests, look for mine
*/
while (gcmdp = ghd_doneq_get(cccp)) {
/*
* If we got one and it's my request, then
* we're done.
*/
if (gcmdp == poll_gcmdp) {
poll_gcmdp->cmd_state = GCMD_STATE_IDLE;
got_it = TRUE;
continue;
}
/* fifo queue the other cmds on my local list */
L2_add(&gcmd_hold_queue, &gcmdp->cmd_q, gcmdp);
}
/*
* Check whether we're done yet.
*/
switch (polltype) {
case GHD_POLL_DEVICE:
/*
* wait for everything queued on a specific device
*/
if (GDEV_NACTIVE(gtgtp->gt_gdevp) == 0)
got_it = TRUE;
break;
case GHD_POLL_ALL:
/*
* if waiting for all outstanding requests and
* if active list is now empty then exit
*/
if (GHBA_NACTIVE(cccp) == 0)
got_it = TRUE;
break;
case GHD_POLL_REQUEST:
break;
}
}
if (L2_EMPTY(&gcmd_hold_queue)) {
ASSERT(!mutex_owned(&cccp->ccc_waitq_mutex));
ASSERT(mutex_owned(&cccp->ccc_hba_mutex));
return (got_it);
}
/*
* copy the local gcmd_hold_queue back to the doneq so
* that the order of completion callbacks is preserved
*/
while (gcmdp = L2_next(&gcmd_hold_queue)) {
L2_delete(&gcmdp->cmd_q);
GHD_DONEQ_PUT_TAIL(cccp, gcmdp);
}
ASSERT(!mutex_owned(&cccp->ccc_waitq_mutex));
ASSERT(mutex_owned(&cccp->ccc_hba_mutex));
return (got_it);
}
