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aic7xxx_old.c：源码内容

p->needppr &= ~mask;
p->needppr_copy &= ~mask;
p->needsdtr |= mask;
p->needsdtr_copy |= mask;
p->needwdtr |= mask;
p->needwdtr_copy |= mask;
}
}
}
queue_depth = p->dev_temp_queue_depth[tindex];
if (queue_depth >= p->dev_active_cmds[tindex])
{
scbp = scbq_remove_head(&p->delayed_scbs[tindex]);
if (scbp)
{
if (queue_depth == 1)
{
/*
* Give extra preference to untagged devices, such as CD-R devices
* This makes it more likely that a drive *won't* stuff up while
* waiting on data at a critical time, such as CD-R writing and
* audio CD ripping operations. Should also benefit tape drives.
*/
scbq_insert_head(&p->waiting_scbs, scbp);
}
else
{
scbq_insert_tail(&p->waiting_scbs, scbp);
}
#ifdef AIC7XXX_VERBOSE_DEBUGGING
if (aic7xxx_verbose > 0xffff)
printk(INFO_LEAD "Moving SCB from delayed to waiting queue.n",
p->host_no, CTL_OF_SCB(scbp));
#endif
if (queue_depth > p->dev_active_cmds[tindex])
{
scbp = scbq_remove_head(&p->delayed_scbs[tindex]);
if (scbp)
scbq_insert_tail(&p->waiting_scbs, scbp);
}
}
}
if (!(scb->tag_action))
{
aic7xxx_index_busy_target(p, scb->hscb->target_channel_lun,
/* unbusy */ TRUE);
if (p->tagenable & (1<<tindex))
{
p->dev_temp_queue_depth[tindex] = p->dev_max_queue_depth[tindex];
}
}
if(scb->flags & SCB_DTR_SCB)
{
p->dtr_pending &= ~(1 << tindex);
}
p->dev_active_cmds[tindex]--;
p->activescbs--;
{
int actual;
/*
* XXX: we should actually know how much actually transferred
* XXX: for each command, but apparently that's too difficult.
*
* We set a lower limit of 512 bytes on the transfer length. We
* ignore anything less than this because we don't have a real
* reason to count it. Read/Writes to tapes are usually about 20K
* and disks are a minimum of 512 bytes unless you want to count
* non-read/write commands (such as TEST_UNIT_READY) which we don't
*/
actual = scb->sg_length;
if ((actual >= 512) && (((cmd->result >> 16) & 0xf) == DID_OK))
{
struct aic7xxx_xferstats *sp;
#ifdef AIC7XXX_PROC_STATS
long *ptr;
int x;
#endif /* AIC7XXX_PROC_STATS */
sp = &p->stats[TARGET_INDEX(cmd)];
/*
* For block devices, cmd->request.cmd is always == either READ or
* WRITE. For character devices, this isn't always set properly, so
* we check data_cmnd[0]. This catches the conditions for st.c, but
* I'm still not sure if request.cmd is valid for sg devices.
*/
if ( (cmd->request.cmd == WRITE) || (cmd->data_cmnd[0] == WRITE_6) ||
(cmd->data_cmnd[0] == WRITE_FILEMARKS) )
{
sp->w_total++;
#ifdef AIC7XXX_VERBOSE_DEBUGGING
if ( (sp->w_total > 16) && (aic7xxx_verbose > 0xffff) )
aic7xxx_verbose &= 0xffff;
#endif
#ifdef AIC7XXX_PROC_STATS
ptr = sp->w_bins;
#endif /* AIC7XXX_PROC_STATS */
}
else
{
sp->r_total++;
#ifdef AIC7XXX_VERBOSE_DEBUGGING
if ( (sp->r_total > 16) && (aic7xxx_verbose > 0xffff) )
aic7xxx_verbose &= 0xffff;
#endif
#ifdef AIC7XXX_PROC_STATS
ptr = sp->r_bins;
#endif /* AIC7XXX_PROC_STATS */
}
#ifdef AIC7XXX_PROC_STATS
x = -11;
while(actual)
{
actual >>= 1;
x++;
}
if (x < 0)
{
ptr[0]++;
}
else if (x > 7)
{
ptr[7]++;
}
else
{
ptr[x]++;
}
#endif /* AIC7XXX_PROC_STATS */
}
}
aic7xxx_free_scb(p, scb);
aic7xxx_queue_cmd_complete(p, cmd);
}
/*+F*************************************************************************
* Function:
* aic7xxx_run_done_queue
*
* Description:
* Calls the aic7xxx_done() for the Scsi_Cmnd of each scb in the
* aborted list, and adds each scb to the free list. If complete
* is TRUE, we also process the commands complete list.
*-F*************************************************************************/
static void
aic7xxx_run_done_queue(struct aic7xxx_host *p, /*complete*/ int complete)
{
struct aic7xxx_scb *scb;
int i, found = 0;
for (i = 0; i < p->scb_data->numscbs; i++)
{
scb = p->scb_data->scb_array[i];
if (scb->flags & SCB_QUEUED_FOR_DONE)
{
if (aic7xxx_verbose & (VERBOSE_ABORT_PROCESS | VERBOSE_RESET_PROCESS))
printk(INFO_LEAD "Aborting scb %dn",
p->host_no, CTL_OF_SCB(scb), scb->hscb->tag);
found++;
/*
* Clear any residual information since the normal aic7xxx_done() path
* doesn't touch the residuals.
*/
scb->hscb->residual_SG_segment_count = 0;
scb->hscb->residual_data_count[0] = 0;
scb->hscb->residual_data_count[1] = 0;
scb->hscb->residual_data_count[2] = 0;
aic7xxx_done(p, scb);
}
}
if (aic7xxx_verbose & (VERBOSE_ABORT_RETURN | VERBOSE_RESET_RETURN))
{
printk(INFO_LEAD "%d commands found and queued for "
"completion.n", p->host_no, -1, -1, -1, found);
}
if (complete)
{
aic7xxx_done_cmds_complete(p);
}
}
/*+F*************************************************************************
* Function:
* aic7xxx_abort_waiting_scb
*
* Description:
* Manipulate the waiting for selection list and return the
* scb that follows the one that we remove.
*-F*************************************************************************/
static unsigned char
aic7xxx_abort_waiting_scb(struct aic7xxx_host *p, struct aic7xxx_scb *scb,
unsigned char scbpos, unsigned char prev)
{
unsigned char curscb, next;
/*
* Select the SCB we want to abort and pull the next pointer out of it.
*/
curscb = aic_inb(p, SCBPTR);
aic_outb(p, scbpos, SCBPTR);
next = aic_inb(p, SCB_NEXT);
aic7xxx_add_curscb_to_free_list(p);
/*
* Update the waiting list
*/
if (prev == SCB_LIST_NULL)
{
/*
* First in the list
*/
aic_outb(p, next, WAITING_SCBH);
}
else
{
/*
* Select the scb that pointed to us and update its next pointer.
*/
aic_outb(p, prev, SCBPTR);
aic_outb(p, next, SCB_NEXT);
}
/*
* Point us back at the original scb position and inform the SCSI
* system that the command has been aborted.
*/
aic_outb(p, curscb, SCBPTR);
return (next);
}
/*+F*************************************************************************
* Function:
* aic7xxx_search_qinfifo
*
* Description:
* Search the queue-in FIFO for matching SCBs and conditionally
* requeue. Returns the number of matching SCBs.
*-F*************************************************************************/
static int
aic7xxx_search_qinfifo(struct aic7xxx_host *p, int target, int channel,
int lun, unsigned char tag, int flags, int requeue,
volatile scb_queue_type *queue)
{
int found;
unsigned char qinpos, qintail;
struct aic7xxx_scb *scbp;
found = 0;
qinpos = aic_inb(p, QINPOS);
qintail = p->qinfifonext;
p->qinfifonext = qinpos;
while (qinpos != qintail)
{
scbp = p->scb_data->scb_array[p->qinfifo[qinpos++]];
if (aic7xxx_match_scb(p, scbp, target, channel, lun, tag))
{
/*
* We found an scb that needs to be removed.
*/
if (requeue && (queue != NULL))
{
if (scbp->flags & SCB_WAITINGQ)
{
scbq_remove(queue, scbp);
scbq_remove(&p->waiting_scbs, scbp);
scbq_remove(&p->delayed_scbs[TARGET_INDEX(scbp->cmd)], scbp);
p->dev_active_cmds[TARGET_INDEX(scbp->cmd)]++;
p->activescbs++;
}
scbq_insert_tail(queue, scbp);
p->dev_active_cmds[TARGET_INDEX(scbp->cmd)]--;
p->activescbs--;
scbp->flags |= SCB_WAITINGQ;
if ( !(scbp->tag_action & TAG_ENB) )
{
aic7xxx_index_busy_target(p, scbp->hscb->target_channel_lun,
TRUE);
}
}
else if (requeue)
{
p->qinfifo[p->qinfifonext++] = scbp->hscb->tag;
}
else
{
/*
* Preserve any SCB_RECOVERY_SCB flags on this scb then set the
* flags we were called with, presumeably so aic7xxx_run_done_queue
* can find this scb
*/
scbp->flags = flags | (scbp->flags & SCB_RECOVERY_SCB);
if (aic7xxx_index_busy_target(p, scbp->hscb->target_channel_lun,
FALSE) == scbp->hscb->tag)
{
aic7xxx_index_busy_target(p, scbp->hscb->target_channel_lun,
TRUE);
}
}
found++;
}
else
{
p->qinfifo[p->qinfifonext++] = scbp->hscb->tag;
}
}
/*
* Now that we've done the work, clear out any left over commands in the
* qinfifo and update the KERNEL_QINPOS down on the card.
*
* NOTE: This routine expect the sequencer to already be paused when
* it is run....make sure it's that way!
*/
qinpos = p->qinfifonext;
while(qinpos != qintail)
{
p->qinfifo[qinpos++] = SCB_LIST_NULL;
}
if (p->features & AHC_QUEUE_REGS)
aic_outb(p, p->qinfifonext, HNSCB_QOFF);
else
aic_outb(p, p->qinfifonext, KERNEL_QINPOS);
return (found);
}
/*+F*************************************************************************
* Function:
* aic7xxx_scb_on_qoutfifo
*
* Description:
* Is the scb that was passed to us currently on the qoutfifo?
*-F*************************************************************************/
static int
aic7xxx_scb_on_qoutfifo(struct aic7xxx_host *p, struct aic7xxx_scb *scb)
{
int i=0;
while(p->qoutfifo[(p->qoutfifonext + i) & 0xff ] != SCB_LIST_NULL)
{
if(p->qoutfifo[(p->qoutfifonext + i) & 0xff ] == scb->hscb->tag)
return TRUE;
else
i++;
}
return FALSE;
}
/*+F*************************************************************************
* Function:
* aic7xxx_reset_device
*
* Description:
* The device at the given target/channel has been reset. Abort
* all active and queued scbs for that target/channel. This function
* need not worry about linked next pointers because if was a MSG_ABORT_TAG
* then we had a tagged command (no linked next), if it was MSG_ABORT or
* MSG_BUS_DEV_RESET then the device won't know about any commands any more
* and no busy commands will exist, and if it was a bus reset, then nothing
* knows about any linked next commands any more. In all cases, we don't
* need to worry about the linked next or busy scb, we just need to clear
* them.
*-F*************************************************************************/
static void
aic7xxx_reset_device(struct aic7xxx_host *p, int target, int channel,
int lun, unsigned char tag)
{
struct aic7xxx_scb *scbp;
unsigned char active_scb, tcl;
int i = 0, j, init_lists = FALSE;
/*
* Restore this when we're done
*/
active_scb = aic_inb(p, SCBPTR);
if (aic7xxx_verbose & (VERBOSE_RESET_PROCESS | VERBOSE_ABORT_PROCESS))
{
printk(INFO_LEAD "Reset device, active_scb %dn",
p->host_no, channel, target, lun, active_scb);
printk(INFO_LEAD "Current scb_tag %d, SEQADDR 0x%x, LASTPHASE "
"0x%xn",
p->host_no, channel, target, lun, aic_inb(p, SCB_TAG),
aic_inb(p, SEQADDR0) | (aic_inb(p, SEQADDR1) << 8),
aic_inb(p, LASTPHASE));
printk(INFO_LEAD "SG_CACHEPTR 0x%x, SG_COUNT %d, SCSISIGI 0x%xn",
p->host_no, channel, target, lun,
(p->features & AHC_ULTRA2) ? aic_inb(p, SG_CACHEPTR) : 0,
aic_inb(p, SG_COUNT), aic_inb(p, SCSISIGI));
printk(INFO_LEAD "SSTAT0 0x%x, SSTAT1 0x%x, SSTAT2 0x%xn",
p->host_no, channel, target, lun, aic_inb(p, SSTAT0),
aic_inb(p, SSTAT1), aic_inb(p, SSTAT2));
}
/*
* Deal with the busy target and linked next issues.
*/
{
int min_target, max_target;
struct aic7xxx_scb *scbp, *prev_scbp;
/* Make all targets 'relative' to bus A. */
if (target == ALL_TARGETS)
{
switch (channel)
{
case 0:
min_target = 0;
max_target = (p->features & AHC_WIDE) ? 15 : 7;
break;
case 1:
min_target = 8;
max_target = 15;
break;
case ALL_CHANNELS:
default:
min_target = 0;
max_target = (p->features & (AHC_TWIN|AHC_WIDE)) ? 15 : 7;
break;
}
}
else
{
min_target = target | (channel << 3);
max_target = min_target;
}
for (i = min_target; i <= max_target; i++)
{
if ( i == p->scsi_id )
{
continue;
}
if (aic7xxx_verbose & (VERBOSE_ABORT_PROCESS | VERBOSE_RESET_PROCESS))
printk(INFO_LEAD "Cleaning up status information "
"and delayed_scbs.n", p->host_no, channel, i, lun);
p->dev_flags[i] &= ~BUS_DEVICE_RESET_PENDING;
if ( tag == SCB_LIST_NULL )
{
p->dev_flags[i] |= DEVICE_PRINT_DTR | DEVICE_RESET_DELAY;
p->dev_expires[i] = jiffies + (1 * HZ);
p->dev_timer_active |= (0x01 << i);
p->dev_last_queue_full_count[i] = 0;
p->dev_last_queue_full[i] = 0;
p->dev_temp_queue_depth[i] =
p->dev_max_queue_depth[i];
}
for(j=0; j<MAX_LUNS; j++)
{
if (channel == 1)
tcl = ((i << 4) & 0x70) | (channel << 3) | j;
else
tcl = (i << 4) | (channel << 3) | j;
if ( (aic7xxx_index_busy_target(p, tcl, FALSE) == tag) ||
(tag == SCB_LIST_NULL) )
aic7xxx_index_busy_target(p, tcl, /* unbusy */ TRUE);
}
j = 0;
prev_scbp = NULL;
scbp = p->delayed_scbs[i].head;
while ( (scbp != NULL) && (j++ <= (p->scb_data->numscbs + 1)) )
{
prev_scbp = scbp;
scbp = scbp->q_next;
if ( prev_scbp == scbp )
{
if (aic7xxx_verbose & (VERBOSE_ABORT | VERBOSE_RESET))
printk(WARN_LEAD "Yikes!! scb->q_next == scb "
"in the delayed_scbs queue!n", p->host_no, channel, i, lun);
scbp = NULL;
prev_scbp->q_next = NULL;
p->delayed_scbs[i].tail = prev_scbp;
}
if (aic7xxx_match_scb(p, prev_scbp, target, channel, lun, tag))
{
scbq_remove(&p->delayed_scbs[i], prev_scbp);
if (prev_scbp->flags & SCB_WAITINGQ)
{
p->dev_active_cmds[i]++;
p->activescbs++;
}
prev_scbp->flags &= ~(SCB_ACTIVE | SCB_WAITINGQ);
prev_scbp->flags |= SCB_RESET | SCB_QUEUED_FOR_DONE;
}
}
if ( j > (p->scb_data->numscbs + 1) )
{
if (aic7xxx_verbose & (VERBOSE_ABORT | VERBOSE_RESET))
printk(WARN_LEAD "Yikes!! There's a loop in the "
"delayed_scbs queue!n", p->host_no, channel, i, lun);
scbq_init(&p->delayed_scbs[i]);
}
if ( !(p->dev_timer_active & (0x01 << MAX_TARGETS)) ||
time_after_eq(p->dev_timer.expires, p->dev_expires[i]) )
{
mod_timer(&p->dev_timer, p->dev_expires[i]);
p->dev_timer_active |= (0x01 << MAX_TARGETS);
}
}
}
if (aic7xxx_verbose & (VERBOSE_ABORT_PROCESS | VERBOSE_RESET_PROCESS))
printk(INFO_LEAD "Cleaning QINFIFO.n", p->host_no, channel, target, lun );
aic7xxx_search_qinfifo(p, target, channel, lun, tag,
SCB_RESET | SCB_QUEUED_FOR_DONE, /* requeue */ FALSE, NULL);
/*
* Search the waiting_scbs queue for matches, this catches any SCB_QUEUED
* ABORT/RESET commands.
*/
if (aic7xxx_verbose & (VERBOSE_ABORT_PROCESS | VERBOSE_RESET_PROCESS))
printk(INFO_LEAD "Cleaning waiting_scbs.n", p->host_no, channel,
target, lun );
{
struct aic7xxx_scb *scbp, *prev_scbp;
j = 0;
prev_scbp = NULL;
scbp = p->waiting_scbs.head;
while ( (scbp != NULL) && (j++ <= (p->scb_data->numscbs + 1)) )
{
prev_scbp = scbp;
scbp = scbp->q_next;
if ( prev_scbp == scbp )
{
if (aic7xxx_verbose & (VERBOSE_ABORT | VERBOSE_RESET))
printk(WARN_LEAD "Yikes!! scb->q_next == scb "
"in the waiting_scbs queue!n", p->host_no, CTL_OF_SCB(scbp));
scbp = NULL;
prev_scbp->q_next = NULL;
p->waiting_scbs.tail = prev_scbp;
}
if (aic7xxx_match_scb(p, prev_scbp, target, channel, lun, tag))
{
scbq_remove(&p->waiting_scbs, prev_scbp);
if (prev_scbp->flags & SCB_WAITINGQ)
{
p->dev_active_cmds[TARGET_INDEX(prev_scbp->cmd)]++;
p->activescbs++;
}
prev_scbp->flags &= ~(SCB_ACTIVE | SCB_WAITINGQ);
prev_scbp->flags |= SCB_RESET | SCB_QUEUED_FOR_DONE;
}
}
if ( j > (p->scb_data->numscbs + 1) )
{
if (aic7xxx_verbose & (VERBOSE_ABORT | VERBOSE_RESET))
printk(WARN_LEAD "Yikes!! There's a loop in the "
"waiting_scbs queue!n", p->host_no, channel, target, lun);
scbq_init(&p->waiting_scbs);
}
}
/*
* Search waiting for selection list.
*/
if (aic7xxx_verbose & (VERBOSE_ABORT_PROCESS | VERBOSE_RESET_PROCESS))
printk(INFO_LEAD "Cleaning waiting for selection "
"list.n", p->host_no, channel, target, lun);
{
unsigned char next, prev, scb_index;
next = aic_inb(p, WAITING_SCBH); /* Start at head of list. */
prev = SCB_LIST_NULL;
j = 0;
while ( (next != SCB_LIST_NULL) && (j++ <= (p->scb_data->maxscbs + 1)) )
{
aic_outb(p, next, SCBPTR);
scb_index = aic_inb(p, SCB_TAG);
if (scb_index >= p->scb_data->numscbs)
{
/*
* No aic7xxx_verbose check here.....we want to see this since it
* means either the kernel driver or the sequencer screwed things up
*/
printk(WARN_LEAD "Waiting List inconsistency; SCB index=%d, "
"numscbs=%dn", p->host_no, channel, target, lun, scb_index,
p->scb_data->numscbs);
next = aic_inb(p, SCB_NEXT);
aic7xxx_add_curscb_to_free_list(p);
}
else
{
scbp = p->scb_data->scb_array[scb_index];
if (aic7xxx_match_scb(p, scbp, target, channel, lun, tag))
{
next = aic7xxx_abort_waiting_scb(p, scbp, next, prev);
if (scbp->flags & SCB_WAITINGQ)
{
p->dev_active_cmds[TARGET_INDEX(scbp->cmd)]++;
p->activescbs++;
}
scbp->flags &= ~(SCB_ACTIVE | SCB_WAITINGQ);
scbp->flags |= SCB_RESET | SCB_QUEUED_FOR_DONE;
if (prev == SCB_LIST_NULL)
{
/*
* This is either the first scb on the waiting list, or we
* have already yanked the first and haven't left any behind.
* Either way, we need to turn off the selection hardware if
* it isn't already off.
*/
aic_outb(p, aic_inb(p, SCSISEQ) & ~ENSELO, SCSISEQ);
aic_outb(p, CLRSELTIMEO, CLRSINT1);
}
}
else
{
prev = next;
next = aic_inb(p, SCB_NEXT);
}
}
}
if ( j > (p->scb_data->maxscbs + 1) )
{
printk(WARN_LEAD "Yikes!! There is a loop in the waiting for "
"selection list!n", p->host_no, channel, target, lun);
init_lists = TRUE;
}
}
/*
* Go through disconnected list and remove any entries we have queued
* for completion, zeroing their control byte too.
*/
if (aic7xxx_verbose & (VERBOSE_ABORT_PROCESS | VERBOSE_RESET_PROCESS))
printk(INFO_LEAD "Cleaning disconnected scbs "
"list.n", p->host_no, channel, target, lun);
if (p->flags & AHC_PAGESCBS)
{
unsigned char next, prev, scb_index;
next = aic_inb(p, DISCONNECTED_SCBH);
prev = SCB_LIST_NULL;
j = 0;
while ( (next != SCB_LIST_NULL) && (j++ <= (p->scb_data->maxscbs + 1)) )
{
aic_outb(p, next, SCBPTR);
scb_index = aic_inb(p, SCB_TAG);
if (scb_index > p->scb_data->numscbs)
{
printk(WARN_LEAD "Disconnected List inconsistency; SCB index=%d, "
"numscbs=%dn", p->host_no, channel, target, lun, scb_index,
p->scb_data->numscbs);
next = aic7xxx_rem_scb_from_disc_list(p, next, prev);
}
else
{
scbp = p->scb_data->scb_array[scb_index];
if (aic7xxx_match_scb(p, scbp, target, channel, lun, tag))
{
next = aic7xxx_rem_scb_from_disc_list(p, next, prev);
if (scbp->flags & SCB_WAITINGQ)
{
p->dev_active_cmds[TARGET_INDEX(scbp->cmd)]++;
p->activescbs++;
}
scbp->flags &= ~(SCB_ACTIVE | SCB_WAITINGQ);
scbp->flags |= SCB_RESET | SCB_QUEUED_FOR_DONE;
scbp->hscb->control = 0;
}
else
{
prev = next;
next = aic_inb(p, SCB_NEXT);
}
}
}
if ( j > (p->scb_data->maxscbs + 1) )
{
printk(WARN_LEAD "Yikes!! There is a loop in the disconnected list!n",
p->host_no, channel, target, lun);
init_lists = TRUE;
}
}
/*
* Walk the free list making sure no entries on the free list have
* a valid SCB_TAG value or SCB_CONTROL byte.
*/
if (p->flags & AHC_PAGESCBS)
{
unsigned char next;
j = 0;
next = aic_inb(p, FREE_SCBH);
if ( (next >= p->scb_data->maxhscbs) && (next != SCB_LIST_NULL) )
{
printk(WARN_LEAD "Bogus FREE_SCBH!.n", p->host_no, channel,
target, lun);
init_lists = TRUE;
next = SCB_LIST_NULL;
}
while ( (next != SCB_LIST_NULL) && (j++ <= (p->scb_data->maxscbs + 1)) )
{
aic_outb(p, next, SCBPTR);
if (aic_inb(p, SCB_TAG) < p->scb_data->numscbs)
{
printk(WARN_LEAD "Free list inconsistency!.n", p->host_no, channel,
target, lun);
init_lists = TRUE;
next = SCB_LIST_NULL;
}
else
{
aic_outb(p, SCB_LIST_NULL, SCB_TAG);
aic_outb(p, 0, SCB_CONTROL);
next = aic_inb(p, SCB_NEXT);
}
}
if ( j > (p->scb_data->maxscbs + 1) )
{
printk(WARN_LEAD "Yikes!! There is a loop in the free list!n",
p->host_no, channel, target, lun);
init_lists = TRUE;
}
}
/*
* Go through the hardware SCB array looking for commands that
* were active but not on any list.
*/
if (init_lists)
{
aic_outb(p, SCB_LIST_NULL, FREE_SCBH);
aic_outb(p, SCB_LIST_NULL, WAITING_SCBH);
aic_outb(p, SCB_LIST_NULL, DISCONNECTED_SCBH);
}
for (i = p->scb_data->maxhscbs - 1; i >= 0; i--)
{
unsigned char scbid;
aic_outb(p, i, SCBPTR);
if (init_lists)
{
aic_outb(p, SCB_LIST_NULL, SCB_TAG);
aic_outb(p, SCB_LIST_NULL, SCB_NEXT);
aic_outb(p, 0, SCB_CONTROL);
aic7xxx_add_curscb_to_free_list(p);
}
else
{
scbid = aic_inb(p, SCB_TAG);
if (scbid < p->scb_data->numscbs)
{
scbp = p->scb_data->scb_array[scbid];
if (aic7xxx_match_scb(p, scbp, target, channel, lun, tag))
{
aic_outb(p, 0, SCB_CONTROL);
aic_outb(p, SCB_LIST_NULL, SCB_TAG);
aic7xxx_add_curscb_to_free_list(p);
}
}
}
}
/*
* Go through the entire SCB array now and look for commands for
* for this target that are stillactive. These are other (most likely
* tagged) commands that were disconnected when the reset occurred.
* Any commands we find here we know this about, it wasn't on any queue,
* it wasn't in the qinfifo, it wasn't in the disconnected or waiting
* lists, so it really must have been a paged out SCB. In that case,
* we shouldn't need to bother with updating any counters, just mark
* the correct flags and go on.
*/
for (i = 0; i < p->scb_data->numscbs; i++)
{
scbp = p->scb_data->scb_array[i];
if ((scbp->flags & SCB_ACTIVE) &&
aic7xxx_match_scb(p, scbp, target, channel, lun, tag) &&
!aic7xxx_scb_on_qoutfifo(p, scbp))
{
if (scbp->flags & SCB_WAITINGQ)
{
scbq_remove(&p->waiting_scbs, scbp);
scbq_remove(&p->delayed_scbs[TARGET_INDEX(scbp->cmd)], scbp);
p->dev_active_cmds[TARGET_INDEX(scbp->cmd)]++;
p->activescbs++;
}
scbp->flags |= SCB_RESET | SCB_QUEUED_FOR_DONE;
scbp->flags &= ~(SCB_ACTIVE | SCB_WAITINGQ);
}
}
aic_outb(p, active_scb, SCBPTR);
}
/*+F*************************************************************************
* Function:
* aic7xxx_clear_intstat
*
* Description:
* Clears the interrupt status.
*-F*************************************************************************/
static void
aic7xxx_clear_intstat(struct aic7xxx_host *p)
{
/* Clear any interrupt conditions this may have caused. */
aic_outb(p, CLRSELDO | CLRSELDI | CLRSELINGO, CLRSINT0);
aic_outb(p, CLRSELTIMEO | CLRATNO | CLRSCSIRSTI | CLRBUSFREE | CLRSCSIPERR |
CLRPHASECHG | CLRREQINIT, CLRSINT1);
aic_outb(p, CLRSCSIINT | CLRSEQINT | CLRBRKADRINT | CLRPARERR, CLRINT);
}
/*+F*************************************************************************
* Function:
* aic7xxx_reset_current_bus
*
* Description:
* Reset the current SCSI bus.
*-F*************************************************************************/
static void
aic7xxx_reset_current_bus(struct aic7xxx_host *p)
{
/* Disable reset interrupts. */
aic_outb(p, aic_inb(p, SIMODE1) & ~ENSCSIRST, SIMODE1);
/* Turn off the bus' current operations, after all, we shouldn't have any
* valid commands left to cause a RSELI and SELO once we've tossed the
* bus away with this reset, so we might as well shut down the sequencer
* until the bus is restarted as oppossed to saving the current settings
* and restoring them (which makes no sense to me). */
/* Turn on the bus reset. */
aic_outb(p, aic_inb(p, SCSISEQ) | SCSIRSTO, SCSISEQ);
while ( (aic_inb(p, SCSISEQ) & SCSIRSTO) == 0)
mdelay(5);
/*
* Some of the new Ultra2 chipsets need a longer delay after a chip
* reset than just the init setup creates, so we have to delay here
* before we go into a reset in order to make the chips happy.
*/
if (p->features & AHC_ULTRA2)
mdelay(250);
else
mdelay(50);
/* Turn off the bus reset. */
aic_outb(p, 0, SCSISEQ);
mdelay(10);
aic7xxx_clear_intstat(p);
/* Re-enable reset interrupts. */
aic_outb(p, aic_inb(p, SIMODE1) | ENSCSIRST, SIMODE1);
}
/*+F*************************************************************************
* Function:
* aic7xxx_reset_channel
*
* Description:
* Reset the channel.
*-F*************************************************************************/
static void
aic7xxx_reset_channel(struct aic7xxx_host *p, int channel, int initiate_reset)
{
unsigned long offset_min, offset_max;
unsigned char sblkctl;
int cur_channel;
if (aic7xxx_verbose & VERBOSE_RESET_PROCESS)
printk(INFO_LEAD "Reset channel called, %s initiate reset.n",
p->host_no, channel, -1, -1, (initiate_reset==TRUE) ? "will" : "won't" );
if (channel == 1)
{
p->needsdtr |= (p->needsdtr_copy & 0xFF00);
p->dtr_pending &= 0x00FF;
offset_min = 8;
offset_max = 16;
}
else
{
if (p->features & AHC_TWIN)
{
/* Channel A */
p->needsdtr |= (p->needsdtr_copy & 0x00FF);
p->dtr_pending &= 0xFF00;
offset_min = 0;
offset_max = 8;
}
else
{
p->needppr = p->needppr_copy;
p->needsdtr = p->needsdtr_copy;
p->needwdtr = p->needwdtr_copy;
p->dtr_pending = 0x0;
offset_min = 0;
if (p->features & AHC_WIDE)
{
offset_max = 16;
}
else
{
offset_max = 8;
}
}
}
while (offset_min < offset_max)
{
/*
* Revert to async/narrow transfers until we renegotiate.
*/
aic_outb(p, 0, TARG_SCSIRATE + offset_min);
if (p->features & AHC_ULTRA2)
{
aic_outb(p, 0, TARG_OFFSET + offset_min);
}
offset_min++;
}
/*
* Reset the bus and unpause/restart the controller
*/
sblkctl = aic_inb(p, SBLKCTL);
if ( (p->chip & AHC_CHIPID_MASK) == AHC_AIC7770 )
cur_channel = (sblkctl & SELBUSB) >> 3;
else
cur_channel = 0;
if ( (cur_channel != channel) && (p->features & AHC_TWIN) )
{
/*
* Case 1: Command for another bus is active
*/
if (aic7xxx_verbose & VERBOSE_RESET_PROCESS)
printk(INFO_LEAD "Stealthily resetting idle channel.n", p->host_no,
channel, -1, -1);
/*
* Stealthily reset the other bus without upsetting the current bus.
*/
aic_outb(p, sblkctl ^ SELBUSB, SBLKCTL);
aic_outb(p, aic_inb(p, SIMODE1) & ~ENBUSFREE, SIMODE1);
if (initiate_reset)
{
aic7xxx_reset_current_bus(p);
}
aic_outb(p, aic_inb(p, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP), SCSISEQ);
aic7xxx_clear_intstat(p);
aic_outb(p, sblkctl, SBLKCTL);
}
else
{
/*
* Case 2: A command from this bus is active or we're idle.
*/
if (aic7xxx_verbose & VERBOSE_RESET_PROCESS)
printk(INFO_LEAD "Resetting currently active channel.n", p->host_no,
channel, -1, -1);
aic_outb(p, aic_inb(p, SIMODE1) & ~(ENBUSFREE|ENREQINIT),
SIMODE1);
p->flags &= ~AHC_HANDLING_REQINITS;
p->msg_type = MSG_TYPE_NONE;
p->msg_len = 0;
if (initiate_reset)
{
aic7xxx_reset_current_bus(p);
}
aic_outb(p, aic_inb(p, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP), SCSISEQ);
aic7xxx_clear_intstat(p);
}
if (aic7xxx_verbose & VERBOSE_RESET_RETURN)
printk(INFO_LEAD "Channel resetn", p->host_no, channel, -1, -1);
/*
* Clean up all the state information for the pending transactions
* on this bus.
*/
aic7xxx_reset_device(p, ALL_TARGETS, channel, ALL_LUNS, SCB_LIST_NULL);
if ( !(p->features & AHC_TWIN) )
{
restart_sequencer(p);
}
return;
}
/*+F*************************************************************************
* Function:
* aic7xxx_run_waiting_queues
*
* Description:
* Scan the awaiting_scbs queue downloading and starting as many
* scbs as we can.
*-F*************************************************************************/
static void
aic7xxx_run_waiting_queues(struct aic7xxx_host *p)
{
struct aic7xxx_scb *scb;
int tindex;
int sent;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,95)
unsigned long cpu_flags = 0;
#endif
if (p->waiting_scbs.head == NULL)
return;
sent = 0;
/*
* First handle SCBs that are waiting but have been assigned a slot.
*/
DRIVER_LOCK
while ((scb = scbq_remove_head(&p->waiting_scbs)) != NULL)
{
tindex = TARGET_INDEX(scb->cmd);
if ( !scb->tag_action && (p->tagenable & (1<<tindex)) )
{
p->dev_temp_queue_depth[tindex] = 1;
}
if ( (p->dev_active_cmds[tindex] >=
p->dev_temp_queue_depth[tindex]) ||
(p->dev_flags[tindex] & (DEVICE_RESET_DELAY|DEVICE_WAS_BUSY)) ||
(p->flags & AHC_RESET_DELAY) )
{
scbq_insert_tail(&p->delayed_scbs[tindex], scb);
}
else
{
scb->flags &= ~SCB_WAITINGQ;
p->dev_active_cmds[tindex]++;
p->activescbs++;
if ( !(scb->tag_action) )
{
aic7xxx_busy_target(p, scb);
}
p->qinfifo[p->qinfifonext++] = scb->hscb->tag;
sent++;
}
}
if (sent)
{
if (p->features & AHC_QUEUE_REGS)
aic_outb(p, p->qinfifonext, HNSCB_QOFF);
else
{
pause_sequencer(p);
aic_outb(p, p->qinfifonext, KERNEL_QINPOS);
unpause_sequencer(p, FALSE);
}
if (p->activescbs > p->max_activescbs)
p->max_activescbs = p->activescbs;
}
DRIVER_UNLOCK
}
#ifdef CONFIG_PCI
#define DPE 0x80
#define SSE 0x40
#define RMA 0x20
#define RTA 0x10
#define STA 0x08
#define DPR 0x01
/*+F*************************************************************************
* Function:
* aic7xxx_pci_intr
*
* Description:
* Check the scsi card for PCI errors and clear the interrupt
*
* NOTE: If you don't have this function and a 2940 card encounters
* a PCI error condition, the machine will end up locked as the
* interrupt handler gets slammed with non-stop PCI error interrupts
*-F*************************************************************************/
static void
aic7xxx_pci_intr(struct aic7xxx_host *p)
{
unsigned char status1;
pci_read_config_byte(p->pdev, PCI_STATUS + 1, &status1);
if ( (status1 & DPE) && (aic7xxx_verbose & VERBOSE_MINOR_ERROR) )
printk(WARN_LEAD "Data Parity Error during PCI address or PCI write"
"phase.n", p->host_no, -1, -1, -1);
if ( (status1 & SSE) && (aic7xxx_verbose & VERBOSE_MINOR_ERROR) )
printk(WARN_LEAD "Signal System Error Detectedn", p->host_no,
-1, -1, -1);
if ( (status1 & RMA) && (aic7xxx_verbose & VERBOSE_MINOR_ERROR) )
printk(WARN_LEAD "Received a PCI Master Abortn", p->host_no,
-1, -1, -1);
if ( (status1 & RTA) && (aic7xxx_verbose & VERBOSE_MINOR_ERROR) )
printk(WARN_LEAD "Received a PCI Target Abortn", p->host_no,
-1, -1, -1);
if ( (status1 & STA) && (aic7xxx_verbose & VERBOSE_MINOR_ERROR) )
printk(WARN_LEAD "Signaled a PCI Target Abortn", p->host_no,
-1, -1, -1);
if ( (status1 & DPR) && (aic7xxx_verbose & VERBOSE_MINOR_ERROR) )
printk(WARN_LEAD "Data Parity Error has been reported via PCI pin "
"PERR#n", p->host_no, -1, -1, -1);
pci_write_config_byte(p->pdev, PCI_STATUS + 1, status1);
if (status1 & (DPR|RMA|RTA))
aic_outb(p, CLRPARERR, CLRINT);
if ( (aic7xxx_panic_on_abort) && (p->spurious_int > 500) )
aic7xxx_panic_abort(p, NULL);
}
#endif /* CONFIG_PCI */
/*+F*************************************************************************
* Function:
* aic7xxx_timer
*
* Description:
* Take expired extries off of delayed queues and place on waiting queue
* then run waiting queue to start commands.
***************************************************************************/
static void
aic7xxx_timer(struct aic7xxx_host *p)
{
int i, j;
unsigned long cpu_flags = 0;
struct aic7xxx_scb *scb;
spin_lock_irqsave(&io_request_lock, cpu_flags);
p->dev_timer_active &= ~(0x01 << MAX_TARGETS);
if ( (p->dev_timer_active & (0x01 << p->scsi_id)) &&
time_after_eq(jiffies, p->dev_expires[p->scsi_id]) )
{
p->flags &= ~AHC_RESET_DELAY;
p->dev_timer_active &= ~(0x01 << p->scsi_id);
}
for(i=0; i<MAX_TARGETS; i++)
{
if ( (i != p->scsi_id) &&
(p->dev_timer_active & (0x01 << i)) &&
time_after_eq(jiffies, p->dev_expires[i]) )
{
p->dev_timer_active &= ~(0x01 << i);
p->dev_flags[i] &= ~(DEVICE_RESET_DELAY|DEVICE_WAS_BUSY);
p->dev_temp_queue_depth[i] = p->dev_max_queue_depth[i];
j = 0;
while ( ((scb = scbq_remove_head(&p->delayed_scbs[i])) != NULL) &&
(j++ < p->scb_data->numscbs) )
{
scbq_insert_tail(&p->waiting_scbs, scb);
}
if (j == p->scb_data->numscbs)
{
printk(INFO_LEAD "timer: Yikes, loop in delayed_scbs list.n",
p->host_no, 0, i, -1);
scbq_init(&p->delayed_scbs[i]);
scbq_init(&p->waiting_scbs);
/*
* Well, things are screwed now, wait for a reset to clean the junk
* out.
*/
}
}
else if ( p->dev_timer_active & (0x01 << i) )
{
if ( p->dev_timer_active & (0x01 << MAX_TARGETS) )
{
if ( time_after_eq(p->dev_timer.expires, p->dev_expires[i]) )
{
p->dev_timer.expires = p->dev_expires[i];
}
}
else
{
p->dev_timer.expires = p->dev_expires[i];
p->dev_timer_active |= (0x01 << MAX_TARGETS);
}
}
}
if ( p->dev_timer_active & (0x01 << MAX_TARGETS) )
{
add_timer(&p->dev_timer);
}
aic7xxx_run_waiting_queues(p);
spin_unlock_irqrestore(&io_request_lock, cpu_flags);
}
/*+F*************************************************************************
* Function:
* aic7xxx_construct_ppr
*
* Description:
* Build up a Parallel Protocol Request message for use with SCSI-3
* devices.
*-F*************************************************************************/
static void
aic7xxx_construct_ppr(struct aic7xxx_host *p, struct aic7xxx_scb *scb)
{
int tindex = TARGET_INDEX(scb->cmd);
p->msg_buf[p->msg_index++] = MSG_EXTENDED;
p->msg_buf[p->msg_index++] = MSG_EXT_PPR_LEN;
p->msg_buf[p->msg_index++] = MSG_EXT_PPR;
p->msg_buf[p->msg_index++] = p->transinfo[tindex].goal_period;
p->msg_buf[p->msg_index++] = 0;
p->msg_buf[p->msg_index++] = p->transinfo[tindex].goal_offset;
p->msg_buf[p->msg_index++] = p->transinfo[tindex].goal_width;
p->msg_buf[p->msg_index++] = p->transinfo[tindex].goal_options;
p->msg_len += 8;
}
/*+F*************************************************************************
* Function:
* aic7xxx_construct_sdtr
*
* Description:
* Constucts a synchronous data transfer message in the message
* buffer on the sequencer.
*-F*************************************************************************/
static void
aic7xxx_construct_sdtr(struct aic7xxx_host *p, unsigned char period,
unsigned char offset)
{
p->msg_buf[p->msg_index++] = MSG_EXTENDED;
p->msg_buf[p->msg_index++] = MSG_EXT_SDTR_LEN;
p->msg_buf[p->msg_index++] = MSG_EXT_SDTR;
p->msg_buf[p->msg_index++] = period;
p->msg_buf[p->msg_index++] = offset;
p->msg_len += 5;
}
/*+F*************************************************************************
* Function:
* aic7xxx_construct_wdtr
*
* Description:
* Constucts a wide data transfer message in the message buffer
* on the sequencer.
*-F*************************************************************************/
static void
aic7xxx_construct_wdtr(struct aic7xxx_host *p, unsigned char bus_width)
{
p->msg_buf[p->msg_index++] = MSG_EXTENDED;
p->msg_buf[p->msg_index++] = MSG_EXT_WDTR_LEN;
p->msg_buf[p->msg_index++] = MSG_EXT_WDTR;
p->msg_buf[p->msg_index++] = bus_width;
p->msg_len += 4;
}
/*+F*************************************************************************
* Function:
* aic7xxx_calc_residual
*
* Description:
* Calculate the residual data not yet transferred.
*-F*************************************************************************/
static void
aic7xxx_calculate_residual (struct aic7xxx_host *p, struct aic7xxx_scb *scb)
{
struct aic7xxx_hwscb *hscb;
Scsi_Cmnd *cmd;
int actual, i;
cmd = scb->cmd;
hscb = scb->hscb;
/*
* Don't destroy valid residual information with
* residual coming from a check sense operation.
*/
if (((scb->hscb->control & DISCONNECTED) == 0) &&
(scb->flags & SCB_SENSE) == 0)
{
/*
* We had an underflow. At this time, there's only
* one other driver that bothers to check for this,
* and cmd->underflow seems to be set rather half-
* heartedly in the higher-level SCSI code.
*/
actual = scb->sg_length;
for (i=1; i < hscb->residual_SG_segment_count; i++)
{
actual -= scb->sg_list[scb->sg_count - i].length;
}
actual -= (hscb->residual_data_count[2] << 16) |
(hscb->residual_data_count[1] << 8) |
hscb->residual_data_count[0];
if (actual < cmd->underflow)
{
if (aic7xxx_verbose & VERBOSE_MINOR_ERROR)
{
printk(INFO_LEAD "Underflow - Wanted %u, %s %u, residual SG "
"count %d.n", p->host_no, CTL_OF_SCB(scb), cmd->underflow,
(cmd->request.cmd == WRITE) ? "wrote" : "read", actual,
hscb->residual_SG_segment_count);
printk(INFO_LEAD "status 0x%x.n", p->host_no, CTL_OF_SCB(scb),
hscb->target_status);
}
/*
* In 2.4, only send back the residual information, don't flag this
* as an error. Before 2.4 we had to flag this as an error because
* the mid layer didn't check residual data counts to see if the
* command needs retried.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
cmd->resid = scb->sg_length - actual;
#else
aic7xxx_error(cmd) = DID_RETRY_COMMAND;
#endif
aic7xxx_status(cmd) = hscb->target_status;
}
}
/*
* Clean out the residual information in the SCB for the
* next consumer.
*/
hscb->residual_data_count[2] = 0;
hscb->residual_data_count[1] = 0;
hscb->residual_data_count[0] = 0;
hscb->residual_SG_segment_count = 0;
}
/*+F*************************************************************************
* Function:
* aic7xxx_handle_device_reset
*
* Description:
* Interrupt handler for sequencer interrupts (SEQINT).
*-F*************************************************************************/
static void
aic7xxx_handle_device_reset(struct aic7xxx_host *p, int target, int channel)
{
unsigned short targ_mask;
unsigned char tindex = target;
tindex |= ((channel & 0x01) << 3);
targ_mask = (0x01 << tindex);
/*
* Go back to async/narrow transfers and renegotiate.
*/
p->needppr |= (p->needppr_copy & targ_mask);
p->needsdtr |= (p->needsdtr_copy & targ_mask);
p->needwdtr |= (p->needwdtr_copy & targ_mask);
p->dtr_pending &= ~targ_mask;
aic_outb(p, 0, TARG_SCSIRATE + tindex);
if (p->features & AHC_ULTRA2)
aic_outb(p, 0, TARG_OFFSET + tindex);
aic7xxx_reset_device(p, target, channel, ALL_LUNS, SCB_LIST_NULL);
if (aic7xxx_verbose & VERBOSE_RESET_PROCESS)
printk(INFO_LEAD "Bus Device Reset delivered.n", p->host_no, channel,
target, -1);
aic7xxx_run_done_queue(p, /*complete*/ TRUE);
}
/*+F*************************************************************************
* Function:
* aic7xxx_handle_seqint
*
* Description:
* Interrupt handler for sequencer interrupts (SEQINT).
*-F*************************************************************************/
static void
aic7xxx_handle_seqint(struct aic7xxx_host *p, unsigned char intstat)
{
struct aic7xxx_scb *scb;
unsigned short target_mask;
unsigned char target, lun, tindex;
unsigned char queue_flag = FALSE;
char channel;
target = ((aic_inb(p, SAVED_TCL) >> 4) & 0x0f);
if ( (p->chip & AHC_CHIPID_MASK) == AHC_AIC7770 )
channel = (aic_inb(p, SBLKCTL) & SELBUSB) >> 3;
else
channel = 0;
tindex = target + (channel << 3);
lun = aic_inb(p, SAVED_TCL) & 0x07;
target_mask = (0x01 << tindex);
/*
* Go ahead and clear the SEQINT now, that avoids any interrupt race
* conditions later on in case we enable some other interrupt.
*/
aic_outb(p, CLRSEQINT, CLRINT);
switch (intstat & SEQINT_MASK)
{
case NO_MATCH:
{
aic_outb(p, aic_inb(p, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP),
SCSISEQ);
printk(WARN_LEAD "No active SCB for reconnecting target - Issuing "
"BUS DEVICE RESET.n", p->host_no, channel, target, lun);
printk(WARN_LEAD " SAVED_TCL=0x%x, ARG_1=0x%x, SEQADDR=0x%xn",
p->host_no, channel, target, lun,
aic_inb(p, SAVED_TCL), aic_inb(p, ARG_1),
(aic_inb(p, SEQADDR1) << 8) | aic_inb(p, SEQADDR0));
if (aic7xxx_panic_on_abort)
aic7xxx_panic_abort(p, NULL);
}
break;
case SEND_REJECT:
{
if (aic7xxx_verbose & VERBOSE_MINOR_ERROR)
printk(INFO_LEAD "Rejecting unknown message (0x%x) received from "
"target, SEQ_FLAGS=0x%xn", p->host_no, channel, target, lun,
aic_inb(p, ACCUM), aic_inb(p, SEQ_FLAGS));
}
break;
case NO_IDENT:
{
/*
* The reconnecting target either did not send an identify
* message, or did, but we didn't find an SCB to match and
* before it could respond to our ATN/abort, it hit a dataphase.
* The only safe thing to do is to blow it away with a bus
* reset.
*/
if (aic7xxx_verbose & (VERBOSE_SEQINT | VERBOSE_RESET_MID))
printk(INFO_LEAD "Target did not send an IDENTIFY message; "
"LASTPHASE 0x%x, SAVED_TCL 0x%xn", p->host_no, channel, target,
lun, aic_inb(p, LASTPHASE), aic_inb(p, SAVED_TCL));
aic7xxx_reset_channel(p, channel, /*initiate reset*/ TRUE);
aic7xxx_run_done_queue(p, TRUE);
}
break;
case BAD_PHASE:
if (aic_inb(p, LASTPHASE) == P_BUSFREE)
{
if (aic7xxx_verbose & VERBOSE_SEQINT)
printk(INFO_LEAD "Missed busfree.n", p->host_no, channel,
target, lun);
restart_sequencer(p);
}
else
{
if (aic7xxx_verbose & VERBOSE_SEQINT)
printk(INFO_LEAD "Unknown scsi bus phase, continuingn", p->host_no,
channel, target, lun);
}
break;
case EXTENDED_MSG:
{
p->msg_type = MSG_TYPE_INITIATOR_MSGIN;
p->msg_len = 0;
p->msg_index = 0;
#ifdef AIC7XXX_VERBOSE_DEBUGGING
if (aic7xxx_verbose > 0xffff)
printk(INFO_LEAD "Enabling REQINITs for MSG_INn", p->host_no,
channel, target, lun);
#endif
/*
* To actually receive the message, simply turn on
* REQINIT interrupts and let our interrupt handler
* do the rest (REQINIT should already be true).
*/
p->flags |= AHC_HANDLING_REQINITS;
aic_outb(p, aic_inb(p, SIMODE1) | ENREQINIT, SIMODE1);
/*
* We don't want the sequencer unpaused yet so we return early
*/
return;
}
case REJECT_MSG:
{
/*
* What we care about here is if we had an outstanding SDTR
* or WDTR message for this target. If we did, this is a
* signal that the target is refusing negotiation.
*/
unsigned char scb_index;
unsigned char last_msg;
scb_index = aic_inb(p, SCB_TAG);
scb = p->scb_data->scb_array[scb_index];
last_msg = aic_inb(p, LAST_MSG);
if ( (last_msg == MSG_IDENTIFYFLAG) &&
(scb->tag_action) &&
!(scb->flags & SCB_MSGOUT_BITS) )
{
if (scb->tag_action == MSG_ORDERED_Q_TAG)
{
/*
* OK...the device seems able to accept tagged commands, but
* not ordered tag commands, only simple tag commands. So, we
* disable ordered tag commands and go on with life just like
* normal.
*/
p->orderedtag &= ~target_mask;
scb->tag_action = MSG_SIMPLE_Q_TAG;
scb->hscb->control &= ~SCB_TAG_TYPE;
scb->hscb->control |= MSG_SIMPLE_Q_TAG;
aic_outb(p, scb->hscb->control, SCB_CONTROL);
/*
* OK..we set the tag type to simple tag command, now we re-assert
* ATNO and hope this will take us into the identify phase again
* so we can resend the tag type and info to the device.
*/
aic_outb(p, MSG_IDENTIFYFLAG, MSG_OUT);
aic_outb(p, aic_inb(p, SCSISIGI) | ATNO, SCSISIGO);
}
else if (scb->tag_action == MSG_SIMPLE_Q_TAG)
{
unsigned char i, reset = 0;
struct aic7xxx_scb *scbp;
int old_verbose;
/*
* Hmmmm....the device is flaking out on tagged commands. The
* bad thing is that we already have tagged commands enabled in
* the device struct in the mid level code. We also have a queue
* set according to the tagged queue depth. Gonna have to live
* with it by controlling our queue depth internally and making
* sure we don't set the tagged command flag any more.
*/
p->tagenable &= ~target_mask;
p->orderedtag &= ~target_mask;
p->dev_max_queue_depth[tindex] =
p->dev_temp_queue_depth[tindex] = 1;
/*
* We set this command up as a bus device reset. However, we have
* to clear the tag type as it's causing us problems. We shouldnt
* have to worry about any other commands being active, since if
* the device is refusing tagged commands, this should be the
* first tagged command sent to the device, however, we do have
* to worry about any other tagged commands that may already be
* in the qinfifo. The easiest way to do this, is to issue a BDR,
* send all the commands back to the mid level code, then let them
* come back and get rebuilt as untagged commands.
*/
scb->tag_action = 0;
scb->hscb->control &= ~(TAG_ENB | SCB_TAG_TYPE);
aic_outb(p, scb->hscb->control, SCB_CONTROL);
old_verbose = aic7xxx_verbose;
aic7xxx_verbose &= ~(VERBOSE_RESET|VERBOSE_ABORT);
for (i=0; i!=p->scb_data->numscbs; i++)
{
scbp = p->scb_data->scb_array[i];
if ((scbp->flags & SCB_ACTIVE) && (scbp != scb))
{
if (aic7xxx_match_scb(p, scbp, target, channel, lun, i))
{
aic7xxx_reset_device(p, target, channel, lun, i);
reset++;
}
aic7xxx_run_done_queue(p, TRUE);
}
}
aic7xxx_verbose = old_verbose;
/*
* Wait until after the for loop to set the busy index since
* aic7xxx_reset_device will clear the busy index during its
* operation.
*/
aic7xxx_busy_target(p, scb);
printk(INFO_LEAD "Device is refusing tagged commands, using "
"untagged I/O.n", p->host_no, channel, target, lun);
aic_outb(p, MSG_IDENTIFYFLAG, MSG_OUT);
aic_outb(p, aic_inb(p, SCSISIGI) | ATNO, SCSISIGO);
}
}
else if (scb->flags & SCB_MSGOUT_PPR)
{
/*
* As per the draft specs, any device capable of supporting any of
* the option values other than 0 are not allowed to reject the
* PPR message. Instead, they must negotiate out what they do
* support instead of rejecting our offering or else they cause
* a parity error during msg_out phase to signal that they don't
* like our settings.
*/
p->needppr &= ~target_mask;
p->needppr_copy &= ~target_mask;
aic7xxx_set_width(p, target, channel, lun, MSG_EXT_WDTR_BUS_8_BIT,
(AHC_TRANS_ACTIVE|AHC_TRANS_CUR|AHC_TRANS_QUITE));
aic7xxx_set_syncrate(p, NULL, target, channel, 0, 0, 0,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR|AHC_TRANS_QUITE);
p->transinfo[tindex].goal_options = 0;
p->dtr_pending &= ~target_mask;
scb->flags &= ~SCB_MSGOUT_BITS;
if(aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Device is rejecting PPR messages, falling "
"back.n", p->host_no, channel, target, lun);
}
if ( p->transinfo[tindex].goal_width )
{
p->needwdtr |= target_mask;
p->needwdtr_copy |= target_mask;
p->dtr_pending |= target_mask;
scb->flags |= SCB_MSGOUT_WDTR;
}
if ( p->transinfo[tindex].goal_offset )
{
p->needsdtr |= target_mask;
p->needsdtr_copy |= target_mask;
if( !(p->dtr_pending & target_mask) )
{
p->dtr_pending |= target_mask;
scb->flags |= SCB_MSGOUT_SDTR;
}
}
if ( p->dtr_pending & target_mask )
{
aic_outb(p, HOST_MSG, MSG_OUT);
aic_outb(p, aic_inb(p, SCSISIGI) | ATNO, SCSISIGO);
}
}
else if (scb->flags & SCB_MSGOUT_WDTR)
{
/*
* note 8bit xfers and clear flag
*/
p->needwdtr &= ~target_mask;
p->needwdtr_copy &= ~target_mask;
scb->flags &= ~SCB_MSGOUT_BITS;
aic7xxx_set_width(p, target, channel, lun, MSG_EXT_WDTR_BUS_8_BIT,
(AHC_TRANS_ACTIVE|AHC_TRANS_GOAL|AHC_TRANS_CUR));
aic7xxx_set_syncrate(p, NULL, target, channel, 0, 0, 0,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR|AHC_TRANS_QUITE);
if(aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Device is rejecting WDTR messages, using "
"narrow transfers.n", p->host_no, channel, target, lun);
}
p->needsdtr |= (p->needsdtr_copy & target_mask);
}
else if (scb->flags & SCB_MSGOUT_SDTR)
{
/*
* note asynch xfers and clear flag
*/
p->needsdtr &= ~target_mask;
p->needsdtr_copy &= ~target_mask;
scb->flags &= ~SCB_MSGOUT_BITS;
aic7xxx_set_syncrate(p, NULL, target, channel, 0, 0, 0,
(AHC_TRANS_CUR|AHC_TRANS_ACTIVE|AHC_TRANS_GOAL));
if(aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Device is rejecting SDTR messages, using "
"async transfers.n", p->host_no, channel, target, lun);
}
}
else if (aic7xxx_verbose & VERBOSE_SEQINT)
{
/*
* Otherwise, we ignore it.
*/
printk(INFO_LEAD "Received MESSAGE_REJECT for unknown cause. "
"Ignoring.n", p->host_no, channel, target, lun);
}
}
break;
case BAD_STATUS:
{
unsigned char scb_index;
struct aic7xxx_hwscb *hscb;
Scsi_Cmnd *cmd;
/* The sequencer will notify us when a command has an error that
* would be of interest to the kernel. This allows us to leave
* the sequencer running in the common case of command completes
* without error. The sequencer will have DMA'd the SCB back
* up to us, so we can reference the drivers SCB array.
*
* Set the default return value to 0 indicating not to send
* sense. The sense code will change this if needed and this
* reduces code duplication.
*/
aic_outb(p, 0, RETURN_1);
scb_index = aic_inb(p, SCB_TAG);
if (scb_index > p->scb_data->numscbs)
{
printk(WARN_LEAD "Invalid SCB during SEQINT 0x%02x, SCB_TAG %d.n",
p->host_no, channel, target, lun, intstat, scb_index);
break;
}
scb = p->scb_data->scb_array[scb_index];
hscb = scb->hscb;
if (!(scb->flags & SCB_ACTIVE) || (scb->cmd == NULL))
{
printk(WARN_LEAD "Invalid SCB during SEQINT 0x%x, scb %d, flags 0x%x,"
" cmd 0x%lx.n", p->host_no, channel, target, lun, intstat,
scb_index, scb->flags, (unsigned long) scb->cmd);
}
else
{
cmd = scb->cmd;
hscb->target_status = aic_inb(p, SCB_TARGET_STATUS);
aic7xxx_status(cmd) = hscb->target_status;
cmd->result = hscb->target_status;
switch (status_byte(hscb->target_status))
{
case GOOD:
if (aic7xxx_verbose & VERBOSE_SEQINT)
printk(INFO_LEAD "Interrupted for status of GOOD???n",
p->host_no, CTL_OF_SCB(scb));
break;
case COMMAND_TERMINATED:
case CHECK_CONDITION:
if ( !(scb->flags & SCB_SENSE) )
{
/*
* Send a sense command to the requesting target.
* XXX - revisit this and get rid of the memcopys.
*/
memcpy(scb->sense_cmd, &generic_sense[0],
sizeof(generic_sense));
scb->sense_cmd[1] = (cmd->lun << 5);
scb->sense_cmd[4] = sizeof(cmd->sense_buffer);
scb->sg_list[0].length =
cpu_to_le32(sizeof(cmd->sense_buffer));
scb->sg_list[0].address =
cpu_to_le32(pci_map_single(p->pdev, cmd->sense_buffer,
sizeof(cmd->sense_buffer),
PCI_DMA_FROMDEVICE));
/*
* XXX - We should allow disconnection, but can't as it
* might allow overlapped tagged commands.
*/
/* hscb->control &= DISCENB; */
hscb->control = 0;
hscb->target_status = 0;
hscb->SG_list_pointer =
cpu_to_le32(SCB_DMA_ADDR(scb, scb->sg_list));
hscb->SCSI_cmd_pointer =
cpu_to_le32(SCB_DMA_ADDR(scb, scb->sense_cmd));
hscb->data_count = scb->sg_list[0].length;
hscb->data_pointer = scb->sg_list[0].address;
hscb->SCSI_cmd_length = COMMAND_SIZE(scb->sense_cmd[0]);
hscb->residual_SG_segment_count = 0;
hscb->residual_data_count[0] = 0;
hscb->residual_data_count[1] = 0;
hscb->residual_data_count[2] = 0;
scb->sg_count = hscb->SG_segment_count = 1;
scb->sg_length = sizeof(cmd->sense_buffer);
scb->tag_action = 0;
scb->flags |= SCB_SENSE;
/*
* Ensure the target is busy since this will be an
* an untagged request.
*/
#ifdef AIC7XXX_VERBOSE_DEBUGGING
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
if (scb->flags & SCB_MSGOUT_BITS)
printk(INFO_LEAD "Requesting SENSE with %sn", p->host_no,
CTL_OF_SCB(scb), (scb->flags & SCB_MSGOUT_SDTR) ?
"SDTR" : "WDTR");
else
printk(INFO_LEAD "Requesting SENSE, no MSGn", p->host_no,
CTL_OF_SCB(scb));
}
#endif
aic7xxx_busy_target(p, scb);
aic_outb(p, SEND_SENSE, RETURN_1);
aic7xxx_error(cmd) = DID_OK;
break;
} /* first time sense, no errors */
printk(INFO_LEAD "CHECK_CONDITION on REQUEST_SENSE, returning "
"an error.n", p->host_no, CTL_OF_SCB(scb));
aic7xxx_error(cmd) = DID_ERROR;
scb->flags &= ~SCB_SENSE;
break;
case QUEUE_FULL:
queue_flag = TRUE; /* Mark that this is a QUEUE_FULL and */
case BUSY: /* drop through to here */
{
struct aic7xxx_scb *next_scbp, *prev_scbp;
unsigned char active_hscb, next_hscb, prev_hscb, scb_index;
/*
* We have to look three places for queued commands:
* 1: QINFIFO
* 2: p->waiting_scbs queue
* 3: WAITING_SCBS list on card (for commands that are started
* but haven't yet made it to the device)
*/
aic7xxx_search_qinfifo(p, target, channel, lun,
SCB_LIST_NULL, 0, TRUE,
&p->delayed_scbs[tindex]);
next_scbp = p->waiting_scbs.head;
while ( next_scbp != NULL )
{
prev_scbp = next_scbp;
next_scbp = next_scbp->q_next;
if ( aic7xxx_match_scb(p, prev_scbp, target, channel, lun,
SCB_LIST_NULL) )
{
scbq_remove(&p->waiting_scbs, prev_scbp);
scbq_insert_tail(&p->delayed_scbs[tindex],
prev_scbp);
}
}
next_scbp = NULL;
active_hscb = aic_inb(p, SCBPTR);
prev_hscb = next_hscb = scb_index = SCB_LIST_NULL;
next_hscb = aic_inb(p, WAITING_SCBH);
while (next_hscb != SCB_LIST_NULL)
{
aic_outb(p, next_hscb, SCBPTR);
scb_index = aic_inb(p, SCB_TAG);
if (scb_index < p->scb_data->numscbs)
{
next_scbp = p->scb_data->scb_array[scb_index];
if (aic7xxx_match_scb(p, next_scbp, target, channel, lun,
SCB_LIST_NULL) )
{
if (next_scbp->flags & SCB_WAITINGQ)
{
p->dev_active_cmds[tindex]++;
p->activescbs--;
scbq_remove(&p->delayed_scbs[tindex], next_scbp);
scbq_remove(&p->waiting_scbs, next_scbp);
}
scbq_insert_head(&p->delayed_scbs[tindex],
next_scbp);
next_scbp->flags |= SCB_WAITINGQ;
p->dev_active_cmds[tindex]--;
p->activescbs--;
next_hscb = aic_inb(p, SCB_NEXT);
aic_outb(p, 0, SCB_CONTROL);
aic_outb(p, SCB_LIST_NULL, SCB_TAG);
aic7xxx_add_curscb_to_free_list(p);
if (prev_hscb == SCB_LIST_NULL)
{
/* We were first on the list,
* so we kill the selection
* hardware. Let the sequencer
* re-init the hardware itself
*/
aic_outb(p, aic_inb(p, SCSISEQ) & ~ENSELO, SCSISEQ);
aic_outb(p, CLRSELTIMEO, CLRSINT1);
aic_outb(p, next_hscb, WAITING_SCBH);
}
else
{
aic_outb(p, prev_hscb, SCBPTR);
aic_outb(p, next_hscb, SCB_NEXT);
}
}
else
{
prev_hscb = next_hscb;
next_hscb = aic_inb(p, SCB_NEXT);
}
} /* scb_index >= p->scb_data->numscbs */
}
aic_outb(p, active_hscb, SCBPTR);
if (scb->flags & SCB_WAITINGQ)
{
scbq_remove(&p->delayed_scbs[tindex], scb);
scbq_remove(&p->waiting_scbs, scb);
p->dev_active_cmds[tindex]++;
p->activescbs++;
}
scbq_insert_head(&p->delayed_scbs[tindex], scb);
p->dev_active_cmds[tindex]--;
p->activescbs--;
scb->flags |= SCB_WAITINGQ | SCB_WAS_BUSY;
if ( !(p->dev_timer_active & (0x01 << tindex)) )
{
p->dev_timer_active |= (0x01 << tindex);
if ( p->dev_active_cmds[tindex] )
{
p->dev_expires[tindex] = jiffies + HZ;
}
else
{
p->dev_expires[tindex] = jiffies + (HZ / 10);
}
if ( !(p->dev_timer_active & (0x01 << MAX_TARGETS)) )
{
p->dev_timer.expires = p->dev_expires[tindex];
p->dev_timer_active |= (0x01 << MAX_TARGETS);
add_timer(&p->dev_timer);
}
else if ( time_after_eq(p->dev_timer.expires,
p->dev_expires[tindex]) )
mod_timer(&p->dev_timer, p->dev_expires[tindex]);
}
#ifdef AIC7XXX_VERBOSE_DEBUGGING
if( (aic7xxx_verbose & VERBOSE_MINOR_ERROR) ||
(aic7xxx_verbose > 0xffff) )
{
if (queue_flag)
printk(INFO_LEAD "Queue full received; queue depth %d, "
"active %dn", p->host_no, CTL_OF_SCB(scb),
p->dev_max_queue_depth[tindex],
p->dev_active_cmds[tindex]);
else
printk(INFO_LEAD "Target busyn", p->host_no, CTL_OF_SCB(scb));
}
#endif
if (queue_flag)
{
if ( p->dev_last_queue_full[tindex] !=
p->dev_active_cmds[tindex] )
{
p->dev_last_queue_full[tindex] =
p->dev_active_cmds[tindex];
p->dev_last_queue_full_count[tindex] = 0;
}
else
{
p->dev_last_queue_full_count[tindex]++;
}
if ( (p->dev_last_queue_full_count[tindex] > 14) &&
(p->dev_active_cmds[tindex] > 4) )
{
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
printk(INFO_LEAD "Queue depth reduced to %dn", p->host_no,
CTL_OF_SCB(scb), p->dev_active_cmds[tindex]);
p->dev_max_queue_depth[tindex] =
p->dev_active_cmds[tindex];
p->dev_last_queue_full[tindex] = 0;
p->dev_last_queue_full_count[tindex] = 0;
p->dev_temp_queue_depth[tindex] =
p->dev_active_cmds[tindex];
}
else if (p->dev_active_cmds[tindex] == 0)
{
if (aic7xxx_verbose & VERBOSE_NEGOTIATION)
{
printk(INFO_LEAD "QUEUE_FULL status received with 0 "
"commands active.n", p->host_no, CTL_OF_SCB(scb));
printk(INFO_LEAD "Tagged Command Queueing disabledn",
p->host_no, CTL_OF_SCB(scb));
}
p->dev_max_queue_depth[tindex] = 1;
p->dev_temp_queue_depth[tindex] = 1;
scb->tag_action = 0;
scb->hscb->control &= ~(MSG_ORDERED_Q_TAG|MSG_SIMPLE_Q_TAG);
}
else
{
p->dev_flags[tindex] |= DEVICE_WAS_BUSY;
p->dev_temp_queue_depth[tindex] =
p->dev_active_cmds[tindex];
}
}
break;
}
default:
if (aic7xxx_verbose & VERBOSE_SEQINT)
printk(INFO_LEAD "Unexpected target status 0x%x.n", p->host_no,
CTL_OF_SCB(scb), scb->hscb->target_status);
if (!aic7xxx_error(cmd))
{
aic7xxx_error(cmd) = DID_RETRY_COMMAND;
}
break;
} /* end switch */
} /* end else of */
}
break;
case AWAITING_MSG:
{
unsigned char scb_index, msg_out;
scb_index = aic_inb(p, SCB_TAG);
msg_out = aic_inb(p, MSG_OUT);
scb = p->scb_data->scb_array[scb_index];
p->msg_index = p->msg_len = 0;
/*
* This SCB had a MK_MESSAGE set in its control byte informing
* the sequencer that we wanted to send a special message to
* this target.
*/
if ( !(scb->flags & SCB_DEVICE_RESET) &&
(msg_out == MSG_IDENTIFYFLAG) &&
(scb->hscb->control & TAG_ENB) )
{
p->msg_buf[p->msg_index++] = scb->tag_action;
p->msg_buf[p->msg_index++] = scb->hscb->tag;
p->msg_len += 2;
}
if (scb->flags & SCB_DEVICE_RESET)
{
p->msg_buf[p->msg_index++] = MSG_BUS_DEV_RESET;
p->msg_len++;
if (aic7xxx_verbose & VERBOSE_RESET_PROCESS)
printk(INFO_LEAD "Bus device reset mailed.n",
p->host_no, CTL_OF_SCB(scb));
}
else if (scb->flags & SCB_ABORT)
{
if (scb->tag_action)
{
p->msg_buf[p->msg_index++] = MSG_ABORT_TAG;
}
else
{
p->msg_buf[p->msg_index++] = MSG_ABORT;
}
p->msg_len++;
if (aic7xxx_verbose & VERBOSE_ABORT_PROCESS)
printk(INFO_LEAD "Abort message mailed.n", p->host_no,
CTL_OF_SCB(scb));
}
else if (scb->flags & SCB_MSGOUT_PPR)
{
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Sending PPR (%d/%d/%d/%d) message.n",
p->host_no, CTL_OF_SCB(scb),
p->transinfo[tindex].goal_period,
p->transinfo[tindex].goal_offset,
p->transinfo[tindex].goal_width,
p->transinfo[tindex].goal_options);
}
aic7xxx_construct_ppr(p, scb);
}
else if (scb->flags & SCB_MSGOUT_WDTR)
{
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Sending WDTR message.n", p->host_no,
CTL_OF_SCB(scb));
}
aic7xxx_construct_wdtr(p, p->transinfo[tindex].goal_width);
}
else if (scb->flags & SCB_MSGOUT_SDTR)
{
unsigned int max_sync, period;
unsigned char options = 0;
/*
* Now that the device is selected, use the bits in SBLKCTL and
* SSTAT2 to determine the max sync rate for this device.
*/
if (p->features & AHC_ULTRA2)
{
if ( (aic_inb(p, SBLKCTL) & ENAB40) &&
!(aic_inb(p, SSTAT2) & EXP_ACTIVE) )
{
max_sync = AHC_SYNCRATE_ULTRA2;
}
else
{
max_sync = AHC_SYNCRATE_ULTRA;
}
}
else if (p->features & AHC_ULTRA)
{
max_sync = AHC_SYNCRATE_ULTRA;
}
else
{
max_sync = AHC_SYNCRATE_FAST;
}
period = p->transinfo[tindex].goal_period;
aic7xxx_find_syncrate(p, &period, max_sync, &options);
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Sending SDTR %d/%d message.n", p->host_no,
CTL_OF_SCB(scb), period,
p->transinfo[tindex].goal_offset);
}
aic7xxx_construct_sdtr(p, period,
p->transinfo[tindex].goal_offset);
}
else
{
sti();
panic("aic7xxx: AWAITING_MSG for an SCB that does "
"not have a waiting message.n");
}
/*
* We've set everything up to send our message, now to actually do
* so we need to enable reqinit interrupts and let the interrupt
* handler do the rest. We don't want to unpause the sequencer yet
* though so we'll return early. We also have to make sure that
* we clear the SEQINT *BEFORE* we set the REQINIT handler active
* or else it's possible on VLB cards to loose the first REQINIT
* interrupt. Edge triggered EISA cards could also loose this
* interrupt, although PCI and level triggered cards should not
* have this problem since they continually interrupt the kernel
* until we take care of the situation.
*/
scb->flags |= SCB_MSGOUT_SENT;
p->msg_index = 0;
p->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
p->flags |= AHC_HANDLING_REQINITS;
aic_outb(p, aic_inb(p, SIMODE1) | ENREQINIT, SIMODE1);
return;
}
break;
case DATA_OVERRUN:
{
unsigned char scb_index = aic_inb(p, SCB_TAG);
unsigned char lastphase = aic_inb(p, LASTPHASE);
unsigned int i;
scb = (p->scb_data->scb_array[scb_index]);
/*
* XXX - What do we really want to do on an overrun? The
* mid-level SCSI code should handle this, but for now,
* we'll just indicate that the command should retried.
* If we retrieved sense info on this target, then the
* base SENSE info should have been saved prior to the
* overrun error. In that case, we return DID_OK and let
* the mid level code pick up on the sense info. Otherwise
* we return DID_ERROR so the command will get retried.
*/
if ( !(scb->flags & SCB_SENSE) )
{
printk(WARN_LEAD "Data overrun detected in %s phase, tag %d;n",
p->host_no, CTL_OF_SCB(scb),
(lastphase == P_DATAIN) ? "Data-In" : "Data-Out", scb->hscb->tag);
printk(KERN_WARNING " %s seen Data Phase. Length=%d, NumSGs=%d.n",
(aic_inb(p, SEQ_FLAGS) & DPHASE) ? "Have" : "Haven't",
scb->sg_length, scb->sg_count);
printk(KERN_WARNING " Raw SCSI Command: 0x");
for (i = 0; i < scb->hscb->SCSI_cmd_length; i++)
{
printk("%02x ", scb->cmd->cmnd[i]);
}
printk("n");
if(aic7xxx_verbose > 0xffff)
{
for (i = 0; i < scb->sg_count; i++)
{
printk(KERN_WARNING " sg[%d] - Addr 0x%x : Length %dn",
i,
le32_to_cpu(scb->sg_list[i].address),
le32_to_cpu(scb->sg_list[i].length) );
}
}
aic7xxx_error(scb->cmd) = DID_ERROR;
}
else
printk(INFO_LEAD "Data Overrun during SEND_SENSE operation.n",
p->host_no, CTL_OF_SCB(scb));
}
break;
case WIDE_RESIDUE:
{
unsigned char resid_sgcnt, index;
unsigned char scb_index = aic_inb(p, SCB_TAG);
unsigned int cur_addr, resid_dcnt;
unsigned int native_addr, native_length, sg_addr;
int i;
if(scb_index > p->scb_data->numscbs)
{
printk(WARN_LEAD "invalid scb_index during WIDE_RESIDUE.n",
p->host_no, -1, -1, -1);
/*
* XXX: Add error handling here
*/
break;
}
scb = p->scb_data->scb_array[scb_index];
if(!(scb->flags & SCB_ACTIVE) || (scb->cmd == NULL))
{
printk(WARN_LEAD "invalid scb during WIDE_RESIDUE flags:0x%x "
"scb->cmd:0x%lxn", p->host_no, CTL_OF_SCB(scb),
scb->flags, (unsigned long)scb->cmd);
break;
}
if(aic7xxx_verbose & VERBOSE_MINOR_ERROR)
printk(INFO_LEAD "Got WIDE_RESIDUE message, patching up data "
"pointer.n", p->host_no, CTL_OF_SCB(scb));
/*
* We have a valid scb to use on this WIDE_RESIDUE message, so
* we need to walk the sg list looking for this particular sg
* segment, then see if we happen to be at the very beginning of
* the segment. If we are, then we have to back things up to
* the previous segment. If not, then we simply need to remove
* one byte from this segments address and add one to the byte
* count.
*/
cur_addr = aic_inb(p, SHADDR) | (aic_inb(p, SHADDR + 1) << 8) |
(aic_inb(p, SHADDR + 2) << 16) | (aic_inb(p, SHADDR + 3) << 24);
sg_addr = aic_inb(p, SG_COUNT + 1) | (aic_inb(p, SG_COUNT + 2) << 8) |
(aic_inb(p, SG_COUNT + 3) << 16) | (aic_inb(p, SG_COUNT + 4) << 24);
resid_sgcnt = aic_inb(p, SCB_RESID_SGCNT);
resid_dcnt = aic_inb(p, SCB_RESID_DCNT) |
(aic_inb(p, SCB_RESID_DCNT + 1) << 8) |
(aic_inb(p, SCB_RESID_DCNT + 2) << 16);
index = scb->sg_count - ((resid_sgcnt) ? resid_sgcnt : 1);
native_addr = le32_to_cpu(scb->sg_list[index].address);
native_length = le32_to_cpu(scb->sg_list[index].length);
/*
* If resid_dcnt == native_length, then we just loaded this SG
* segment and we need to back it up one...
*/
if(resid_dcnt == native_length)
{
if(index == 0)
{
/*
* Oops, this isn't right, we can't back up to before the
* beginning. This must be a bogus message, ignore it.
*/
break;
}
resid_dcnt = 1;
resid_sgcnt += 1;
native_addr = le32_to_cpu(scb->sg_list[index - 1].address);
native_length = le32_to_cpu(scb->sg_list[index - 1].length);
cur_addr = native_addr + (native_length - 1);
sg_addr -= sizeof(struct hw_scatterlist);
}
else
{
/*
* resid_dcnt != native_length, so we are in the middle of a SG
* element. Back it up one byte and leave the rest alone.
*/
resid_dcnt += 1;
cur_addr -= 1;
}
/*
* Output the new addresses and counts to the right places on the
* card.
*/
aic_outb(p, resid_sgcnt, SG_COUNT);
aic_outb(p, resid_sgcnt, SCB_RESID_SGCNT);
aic_outb(p, sg_addr & 0xff, SG_COUNT + 1);
aic_outb(p, (sg_addr >> 8) & 0xff, SG_COUNT + 2);
aic_outb(p, (sg_addr >> 16) & 0xff, SG_COUNT + 3);
aic_outb(p, (sg_addr >> 24) & 0xff, SG_COUNT + 4);
aic_outb(p, resid_dcnt & 0xff, SCB_RESID_DCNT);
aic_outb(p, (resid_dcnt >> 8) & 0xff, SCB_RESID_DCNT + 1);
aic_outb(p, (resid_dcnt >> 16) & 0xff, SCB_RESID_DCNT + 2);
/*
* The sequencer actually wants to find the new address
* in the SHADDR register set. On the Ultra2 and later controllers
* this register set is readonly. In order to get the right number
* into the register, you actually have to enter it in HADDR and then
* use the PRELOADEN bit of DFCNTRL to drop it through from the
* HADDR register to the SHADDR register. On non-Ultra2 controllers,
* we simply write it direct.
*/
if(p->features & AHC_ULTRA2)
{
/*
* We might as well be accurate and drop both the resid_dcnt and
* cur_addr into HCNT and HADDR and have both of them drop
* through to the shadow layer together.
*/
aic_outb(p, resid_dcnt & 0xff, HCNT);
aic_outb(p, (resid_dcnt >> 8) & 0xff, HCNT + 1);
aic_outb(p, (resid_dcnt >> 16) & 0xff, HCNT + 2);
aic_outb(p, cur_addr & 0xff, HADDR);
aic_outb(p, (cur_addr >> 8) & 0xff, HADDR + 1);
aic_outb(p, (cur_addr >> 16) & 0xff, HADDR + 2);
aic_outb(p, (cur_addr >> 24) & 0xff, HADDR + 3);
aic_outb(p, aic_inb(p, DMAPARAMS) | PRELOADEN, DFCNTRL);
udelay(1);
aic_outb(p, aic_inb(p, DMAPARAMS) & ~(SCSIEN|HDMAEN), DFCNTRL);
i=0;
while(((aic_inb(p, DFCNTRL) & (SCSIEN|HDMAEN)) != 0) && (i++ < 1000))
{
udelay(1);
}
}
else
{
aic_outb(p, cur_addr & 0xff, SHADDR);
aic_outb(p, (cur_addr >> 8) & 0xff, SHADDR + 1);
aic_outb(p, (cur_addr >> 16) & 0xff, SHADDR + 2);
aic_outb(p, (cur_addr >> 24) & 0xff, SHADDR + 3);
}
}
break;
case SEQ_SG_FIXUP:
{
unsigned char scb_index, tmp;
int sg_addr, sg_length;
scb_index = aic_inb(p, SCB_TAG);
if(scb_index > p->scb_data->numscbs)
{
printk(WARN_LEAD "invalid scb_index during SEQ_SG_FIXUP.n",
p->host_no, -1, -1, -1);
printk(INFO_LEAD "SCSISIGI 0x%x, SEQADDR 0x%x, SSTAT0 0x%x, SSTAT1 "
"0x%xn", p->host_no, -1, -1, -1,
aic_inb(p, SCSISIGI),
aic_inb(p, SEQADDR0) | (aic_inb(p, SEQADDR1) << 8),
aic_inb(p, SSTAT0), aic_inb(p, SSTAT1));
printk(INFO_LEAD "SG_CACHEPTR 0x%x, SSTAT2 0x%x, STCNT 0x%xn",
p->host_no, -1, -1, -1, aic_inb(p, SG_CACHEPTR),
aic_inb(p, SSTAT2), aic_inb(p, STCNT + 2) << 16 |
aic_inb(p, STCNT + 1) << 8 | aic_inb(p, STCNT));
/*
* XXX: Add error handling here
*/
break;
}
scb = p->scb_data->scb_array[scb_index];
if(!(scb->flags & SCB_ACTIVE) || (scb->cmd == NULL))
{
printk(WARN_LEAD "invalid scb during SEQ_SG_FIXUP flags:0x%x "
"scb->cmd:0x%pn", p->host_no, CTL_OF_SCB(scb),
scb->flags, scb->cmd);
printk(INFO_LEAD "SCSISIGI 0x%x, SEQADDR 0x%x, SSTAT0 0x%x, SSTAT1 "
"0x%xn", p->host_no, CTL_OF_SCB(scb),
aic_inb(p, SCSISIGI),
aic_inb(p, SEQADDR0) | (aic_inb(p, SEQADDR1) << 8),
aic_inb(p, SSTAT0), aic_inb(p, SSTAT1));
printk(INFO_LEAD "SG_CACHEPTR 0x%x, SSTAT2 0x%x, STCNT 0x%xn",
p->host_no, CTL_OF_SCB(scb), aic_inb(p, SG_CACHEPTR),
aic_inb(p, SSTAT2), aic_inb(p, STCNT + 2) << 16 |
aic_inb(p, STCNT + 1) << 8 | aic_inb(p, STCNT));
break;
}
if(aic7xxx_verbose & VERBOSE_MINOR_ERROR)
printk(INFO_LEAD "Fixing up SG address for sequencer.n", p->host_no,
CTL_OF_SCB(scb));
/*
* Advance the SG pointer to the next element in the list
*/
tmp = aic_inb(p, SG_NEXT);
tmp += SG_SIZEOF;
aic_outb(p, tmp, SG_NEXT);
if( tmp < SG_SIZEOF )
aic_outb(p, aic_inb(p, SG_NEXT + 1) + 1, SG_NEXT + 1);
tmp = aic_inb(p, SG_COUNT) - 1;
aic_outb(p, tmp, SG_COUNT);
sg_addr = le32_to_cpu(scb->sg_list[scb->sg_count - tmp].address);
sg_length = le32_to_cpu(scb->sg_list[scb->sg_count - tmp].length);
/*
* Now stuff the element we just advanced past down onto the
* card so it can be stored in the residual area.
*/
aic_outb(p, sg_addr & 0xff, HADDR);
aic_outb(p, (sg_addr >> 8) & 0xff, HADDR + 1);
aic_outb(p, (sg_addr >> 16) & 0xff, HADDR + 2);
aic_outb(p, (sg_addr >> 24) & 0xff, HADDR + 3);
aic_outb(p, sg_length & 0xff, HCNT);
aic_outb(p, (sg_length >> 8) & 0xff, HCNT + 1);
aic_outb(p, (sg_length >> 16) & 0xff, HCNT + 2);
aic_outb(p, (tmp << 2) | ((tmp == 1) ? LAST_SEG : 0), SG_CACHEPTR);
aic_outb(p, aic_inb(p, DMAPARAMS), DFCNTRL);
while(aic_inb(p, SSTAT0) & SDONE) udelay(1);
while(aic_inb(p, DFCNTRL) & (HDMAEN|SCSIEN)) aic_outb(p, 0, DFCNTRL);
}
break;
#if AIC7XXX_NOT_YET
case TRACEPOINT2:
{
printk(INFO_LEAD "Tracepoint #2 reached.n", p->host_no,
channel, target, lun);
}
break;
/* XXX Fill these in later */
case MSG_BUFFER_BUSY:
printk("aic7xxx: Message buffer busy.n");
break;
case MSGIN_PHASEMIS:
printk("aic7xxx: Message-in phasemis.n");
break;
#endif
default: /* unknown */
printk(WARN_LEAD "Unknown SEQINT, INTSTAT 0x%x, SCSISIGI 0x%x.n",
p->host_no, channel, target, lun, intstat,
aic_inb(p, SCSISIGI));
break;
}
/*
* Clear the sequencer interrupt and unpause the sequencer.
*/
unpause_sequencer(p, /* unpause always */ TRUE);
}
/*+F*************************************************************************
* Function:
* aic7xxx_parse_msg
*
* Description:
* Parses incoming messages into actions on behalf of
* aic7xxx_handle_reqinit
*_F*************************************************************************/
static int
aic7xxx_parse_msg(struct aic7xxx_host *p, struct aic7xxx_scb *scb)
{
int reject, reply, done;
unsigned char target_scsirate, tindex;
unsigned short target_mask;
unsigned char target, channel, lun;
unsigned char bus_width, new_bus_width;
unsigned char trans_options, new_trans_options;
unsigned int period, new_period, offset, new_offset, maxsync;
struct aic7xxx_syncrate *syncrate;
target = scb->cmd->target;
channel = scb->cmd->channel;
lun = scb->cmd->lun;
reply = reject = done = FALSE;
tindex = TARGET_INDEX(scb->cmd);
target_scsirate = aic_inb(p, TARG_SCSIRATE + tindex);
target_mask = (0x01 << tindex);
/*
* Parse as much of the message as is availible,
* rejecting it if we don't support it. When
* the entire message is availible and has been
* handled, return TRUE indicating that we have
* parsed an entire message.
*/
if (p->msg_buf[0] != MSG_EXTENDED)
{
reject = TRUE;
}
/*
* Even if we are an Ultra3 card, don't allow Ultra3 sync rates when
* using the SDTR messages. We need the PPR messages to enable the
* higher speeds that include things like Dual Edge clocking.
*/
if (p->features & AHC_ULTRA2)
{
if ( (aic_inb(p, SBLKCTL) & ENAB40) &&
!(aic_inb(p, SSTAT2) & EXP_ACTIVE) )
{
if (p->features & AHC_ULTRA3)
maxsync = AHC_SYNCRATE_ULTRA3;
else
maxsync = AHC_SYNCRATE_ULTRA2;
}
else
{
maxsync = AHC_SYNCRATE_ULTRA;
}
}
else if (p->features & AHC_ULTRA)
{
maxsync = AHC_SYNCRATE_ULTRA;
}
else
{
maxsync = AHC_SYNCRATE_FAST;
}
/*
* Just accept the length byte outright and perform
* more checking once we know the message type.
*/
if ( !reject && (p->msg_len > 2) )
{
switch(p->msg_buf[2])
{
case MSG_EXT_SDTR:
{
if (p->msg_buf[1] != MSG_EXT_SDTR_LEN)
{
reject = TRUE;
break;
}
if (p->msg_len < (MSG_EXT_SDTR_LEN + 2))
{
break;
}
period = new_period = p->msg_buf[3];
offset = new_offset = p->msg_buf[4];
trans_options = new_trans_options = 0;
bus_width = new_bus_width = target_scsirate & WIDEXFER;
/*
* If our current max syncrate is in the Ultra3 range, bump it back
* down to Ultra2 since we can't negotiate DT transfers using SDTR
*/
if(maxsync == AHC_SYNCRATE_ULTRA3)
maxsync = AHC_SYNCRATE_ULTRA2;
/*
* We might have a device that is starting negotiation with us
* before we can start up negotiation with it....be prepared to
* have a device ask for a higher speed then we want to give it
* in that case
*/
if ( (scb->flags & (SCB_MSGOUT_SENT|SCB_MSGOUT_SDTR)) !=
(SCB_MSGOUT_SENT|SCB_MSGOUT_SDTR) )
{
if (!(p->dev_flags[tindex] & DEVICE_DTR_SCANNED))
{
/*
* We shouldn't get here unless this is a narrow drive, wide
* devices should trigger this same section of code in the WDTR
* handler first instead.
*/
p->transinfo[tindex].goal_width = MSG_EXT_WDTR_BUS_8_BIT;
p->transinfo[tindex].goal_options = 0;
if(p->transinfo[tindex].user_offset)
{
p->needsdtr_copy |= target_mask;
p->transinfo[tindex].goal_period =
MAX(10,p->transinfo[tindex].user_period);
if(p->features & AHC_ULTRA2)
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_ULTRA2;
}
else
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_8BIT;
}
}
else
{
p->needsdtr_copy &= ~target_mask;
p->transinfo[tindex].goal_period = 255;
p->transinfo[tindex].goal_offset = 0;
}
p->dev_flags[tindex] |= DEVICE_DTR_SCANNED | DEVICE_PRINT_DTR;
}
else if ((p->needsdtr_copy & target_mask) == 0)
{
/*
* This is a preemptive message from the target, we've already
* scanned this target and set our options for it, and we
* don't need a WDTR with this target (for whatever reason),
* so reject this incoming WDTR
*/
reject = TRUE;
break;
}
/* The device is sending this message first and we have to reply */
reply = TRUE;
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Received pre-emptive SDTR message from "
"target.n", p->host_no, CTL_OF_SCB(scb));
}
/*
* Validate the values the device passed to us against our SEEPROM
* settings. We don't have to do this if we aren't replying since
* the device isn't allowed to send values greater than the ones
* we first sent to it.
*/
new_period = MAX(period, p->transinfo[tindex].goal_period);
new_offset = MIN(offset, p->transinfo[tindex].goal_offset);
}
/*
* Use our new_period, new_offset, bus_width, and card options
* to determine the actual syncrate settings
*/
syncrate = aic7xxx_find_syncrate(p, &new_period, maxsync,
&trans_options);
aic7xxx_validate_offset(p, syncrate, &new_offset, bus_width);
/*
* Did we drop to async? If so, send a reply regardless of whether
* or not we initiated this negotiation.
*/
if ((new_offset == 0) && (new_offset != offset))
{
p->needsdtr_copy &= ~target_mask;
reply = TRUE;
}
/*
* Did we start this, if not, or if we went too low and had to
* go async, then send an SDTR back to the target
*/
if(reply)
{
/* when sending a reply, make sure that the goal settings are
* updated along with current and active since the code that
* will actually build the message for the sequencer uses the
* goal settings as its guidelines.
*/
aic7xxx_set_syncrate(p, syncrate, target, channel, new_period,
new_offset, trans_options,
AHC_TRANS_GOAL|AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
scb->flags &= ~SCB_MSGOUT_BITS;
scb->flags |= SCB_MSGOUT_SDTR;
aic_outb(p, HOST_MSG, MSG_OUT);
aic_outb(p, aic_inb(p, SCSISIGO) | ATNO, SCSISIGO);
}
else
{
aic7xxx_set_syncrate(p, syncrate, target, channel, new_period,
new_offset, trans_options,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
p->needsdtr &= ~target_mask;
}
done = TRUE;
break;
}
case MSG_EXT_WDTR:
{
if (p->msg_buf[1] != MSG_EXT_WDTR_LEN)
{
reject = TRUE;
break;
}
if (p->msg_len < (MSG_EXT_WDTR_LEN + 2))
{
break;
}
bus_width = new_bus_width = p->msg_buf[3];
if ( (scb->flags & (SCB_MSGOUT_SENT|SCB_MSGOUT_WDTR)) ==
(SCB_MSGOUT_SENT|SCB_MSGOUT_WDTR) )
{
switch(bus_width)
{
default:
{
reject = TRUE;
if ( (aic7xxx_verbose & VERBOSE_NEGOTIATION2) &&
((p->dev_flags[tindex] & DEVICE_PRINT_DTR) ||
(aic7xxx_verbose > 0xffff)) )
{
printk(INFO_LEAD "Requesting %d bit transfers, rejecting.n",
p->host_no, CTL_OF_SCB(scb), 8 * (0x01 << bus_width));
}
} /* We fall through on purpose */
case MSG_EXT_WDTR_BUS_8_BIT:
{
p->transinfo[tindex].goal_width = MSG_EXT_WDTR_BUS_8_BIT;
p->needwdtr_copy &= ~target_mask;
break;
}
case MSG_EXT_WDTR_BUS_16_BIT:
{
break;
}
}
p->needwdtr &= ~target_mask;
aic7xxx_set_width(p, target, channel, lun, new_bus_width,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
}
else
{
if ( !(p->dev_flags[tindex] & DEVICE_DTR_SCANNED) )
{
/*
* Well, we now know the WDTR and SYNC caps of this device since
* it contacted us first, mark it as such and copy the user stuff
* over to the goal stuff.
*/
if( (p->features & AHC_WIDE) && p->transinfo[tindex].user_width )
{
p->transinfo[tindex].goal_width = MSG_EXT_WDTR_BUS_16_BIT;
p->needwdtr_copy |= target_mask;
}
/*
* Devices that support DT transfers don't start WDTR requests
*/
p->transinfo[tindex].goal_options = 0;
if(p->transinfo[tindex].user_offset)
{
p->needsdtr_copy |= target_mask;
p->transinfo[tindex].goal_period =
MAX(10,p->transinfo[tindex].user_period);
if(p->features & AHC_ULTRA2)
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_ULTRA2;
}
else if( p->transinfo[tindex].goal_width )
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_16BIT;
}
else
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_8BIT;
}
} else {
p->needsdtr_copy &= ~target_mask;
p->transinfo[tindex].goal_period = 255;
p->transinfo[tindex].goal_offset = 0;
}
p->dev_flags[tindex] |= DEVICE_DTR_SCANNED | DEVICE_PRINT_DTR;
}
else if ((p->needwdtr_copy & target_mask) == 0)
{
/*
* This is a preemptive message from the target, we've already
* scanned this target and set our options for it, and we
* don't need a WDTR with this target (for whatever reason),
* so reject this incoming WDTR
*/
reject = TRUE;
break;
}
/* The device is sending this message first and we have to reply */
reply = TRUE;
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Received pre-emptive WDTR message from "
"target.n", p->host_no, CTL_OF_SCB(scb));
}
switch(bus_width)
{
case MSG_EXT_WDTR_BUS_16_BIT:
{
if ( (p->features & AHC_WIDE) &&
(p->transinfo[tindex].goal_width ==
MSG_EXT_WDTR_BUS_16_BIT) )
{
new_bus_width = MSG_EXT_WDTR_BUS_16_BIT;
break;
}
} /* Fall through if we aren't a wide card */
default:
case MSG_EXT_WDTR_BUS_8_BIT:
{
p->needwdtr_copy &= ~target_mask;
new_bus_width = MSG_EXT_WDTR_BUS_8_BIT;
break;
}
}
scb->flags &= ~SCB_MSGOUT_BITS;
scb->flags |= SCB_MSGOUT_WDTR;
p->needwdtr &= ~target_mask;
if((p->dtr_pending & target_mask) == 0)
{
/* there is no other command with SCB_DTR_SCB already set that will
* trigger the release of the dtr_pending bit. Both set the bit
* and set scb->flags |= SCB_DTR_SCB
*/
p->dtr_pending |= target_mask;
scb->flags |= SCB_DTR_SCB;
}
aic_outb(p, HOST_MSG, MSG_OUT);
aic_outb(p, aic_inb(p, SCSISIGO) | ATNO, SCSISIGO);
/* when sending a reply, make sure that the goal settings are
* updated along with current and active since the code that
* will actually build the message for the sequencer uses the
* goal settings as its guidelines.
*/
aic7xxx_set_width(p, target, channel, lun, new_bus_width,
AHC_TRANS_GOAL|AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
}
/*
* By virtue of the SCSI spec, a WDTR message negates any existing
* SDTR negotiations. So, even if needsdtr isn't marked for this
* device, we still have to do a new SDTR message if the device
* supports SDTR at all. Therefore, we check needsdtr_copy instead
* of needstr.
*/
aic7xxx_set_syncrate(p, NULL, target, channel, 0, 0, 0,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR|AHC_TRANS_QUITE);
p->needsdtr |= (p->needsdtr_copy & target_mask);
done = TRUE;
break;
}
case MSG_EXT_PPR:
{
if (p->msg_buf[1] != MSG_EXT_PPR_LEN)
{
reject = TRUE;
break;
}
if (p->msg_len < (MSG_EXT_PPR_LEN + 2))
{
break;
}
period = new_period = p->msg_buf[3];
offset = new_offset = p->msg_buf[5];
bus_width = new_bus_width = p->msg_buf[6];
trans_options = new_trans_options = p->msg_buf[7] & 0xf;
if(aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Parsing PPR message (%d/%d/%d/%d)n",
p->host_no, CTL_OF_SCB(scb), period, offset, bus_width,
trans_options);
}
/*
* We might have a device that is starting negotiation with us
* before we can start up negotiation with it....be prepared to
* have a device ask for a higher speed then we want to give it
* in that case
*/
if ( (scb->flags & (SCB_MSGOUT_SENT|SCB_MSGOUT_PPR)) !=
(SCB_MSGOUT_SENT|SCB_MSGOUT_PPR) )
{
/* Have we scanned the device yet? */
if (!(p->dev_flags[tindex] & DEVICE_DTR_SCANNED))
{
/* The device is electing to use PPR messages, so we will too until
* we know better */
p->needppr |= target_mask;
p->needppr_copy |= target_mask;
p->needsdtr &= ~target_mask;
p->needsdtr_copy &= ~target_mask;
p->needwdtr &= ~target_mask;
p->needwdtr_copy &= ~target_mask;
/* We know the device is SCSI-3 compliant due to PPR */
p->dev_flags[tindex] |= DEVICE_SCSI_3;
/*
* Not only is the device starting this up, but it also hasn't
* been scanned yet, so this would likely be our TUR or our
* INQUIRY command at scan time, so we need to use the
* settings from the SEEPROM if they existed. Of course, even
* if we didn't find a SEEPROM, we stuffed default values into
* the user settings anyway, so use those in all cases.
*/
p->transinfo[tindex].goal_width =
p->transinfo[tindex].user_width;
if(p->transinfo[tindex].user_offset)
{
p->transinfo[tindex].goal_period =
p->transinfo[tindex].user_period;
p->transinfo[tindex].goal_options =
p->transinfo[tindex].user_options;
if(p->features & AHC_ULTRA2)
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_ULTRA2;
}
else if( p->transinfo[tindex].goal_width &&
(bus_width == MSG_EXT_WDTR_BUS_16_BIT) &&
p->features & AHC_WIDE )
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_16BIT;
}
else
{
p->transinfo[tindex].goal_offset = MAX_OFFSET_8BIT;
}
}
else
{
p->transinfo[tindex].goal_period = 255;
p->transinfo[tindex].goal_offset = 0;
p->transinfo[tindex].goal_options = 0;
}
p->dev_flags[tindex] |= DEVICE_DTR_SCANNED | DEVICE_PRINT_DTR;
}
else if ((p->needppr_copy & target_mask) == 0)
{
/*
* This is a preemptive message from the target, we've already
* scanned this target and set our options for it, and we
* don't need a PPR with this target (for whatever reason),
* so reject this incoming PPR
*/
reject = TRUE;
break;
}
/* The device is sending this message first and we have to reply */
reply = TRUE;
if (aic7xxx_verbose & VERBOSE_NEGOTIATION2)
{
printk(INFO_LEAD "Received pre-emptive PPR message from "
"target.n", p->host_no, CTL_OF_SCB(scb));
}
}
switch(bus_width)
{
case MSG_EXT_WDTR_BUS_16_BIT:
{
if ( (p->transinfo[tindex].goal_width ==
MSG_EXT_WDTR_BUS_16_BIT) && p->features & AHC_WIDE)
{
break;
}
}
default:
{
if ( (aic7xxx_verbose & VERBOSE_NEGOTIATION2) &&
((p->dev_flags[tindex] & DEVICE_PRINT_DTR) ||
(aic7xxx_verbose > 0xffff)) )
{
reply = TRUE;
printk(INFO_LEAD "Requesting %d bit transfers, rejecting.n",
p->host_no, CTL_OF_SCB(scb), 8 * (0x01 << bus_width));
}
} /* We fall through on purpose */
case MSG_EXT_WDTR_BUS_8_BIT:
{
/*
* According to the spec, if we aren't wide, we also can't be
* Dual Edge so clear the options byte
*/
new_trans_options = 0;
new_bus_width = MSG_EXT_WDTR_BUS_8_BIT;
break;
}
}
if(reply)
{
/* when sending a reply, make sure that the goal settings are
* updated along with current and active since the code that
* will actually build the message for the sequencer uses the
* goal settings as its guidelines.
*/
aic7xxx_set_width(p, target, channel, lun, new_bus_width,
AHC_TRANS_GOAL|AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
syncrate = aic7xxx_find_syncrate(p, &new_period, maxsync,
&new_trans_options);
aic7xxx_validate_offset(p, syncrate, &new_offset, new_bus_width);
aic7xxx_set_syncrate(p, syncrate, target, channel, new_period,
new_offset, new_trans_options,
AHC_TRANS_GOAL|AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
}
else
{
aic7xxx_set_width(p, target, channel, lun, new_bus_width,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
syncrate = aic7xxx_find_syncrate(p, &new_period, maxsync,
&new_trans_options);
aic7xxx_validate_offset(p, syncrate, &new_offset, new_bus_width);
aic7xxx_set_syncrate(p, syncrate, target, channel, new_period,
new_offset, new_trans_options,
AHC_TRANS_ACTIVE|AHC_TRANS_CUR);
}
/*
* As it turns out, if we don't *have* to have PPR messages, then
* configure ourselves not to use them since that makes some
* external drive chassis work (those chassis can't parse PPR
* messages and they mangle the SCSI bus until you send a WDTR
* and SDTR that they can understand).
*/
if(new_trans_options == 0)
{
p->needppr &= ~target_mask;
p->needppr_copy &= ~target_mask;
if(new_offset)
{
p->needsdtr |= target_mask;
p->needsdtr_copy |= target_mask;
}
if (new_bus_width)
{
p->needwdtr |= target_mask;
p->needwdtr_copy |= target_mask;
}
}