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lsi53c895a: add support for ABORT messages

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If these messages are not handled correctly the guest driver may hang.

Always mandatory:
- ABORT
- BUS DEVICE RESET

Mandatory if tagged queuing is implemented (which disks usually do):
- ABORT TAG
- CLEAR QUEUE

Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Bernhard Kohl 2010-09-06 04:42:54 +00:00 committed by Aurelien Jarno
parent 59df4c1156
commit 508240c0da
1 changed files with 57 additions and 0 deletions
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57
hw/lsi53c895a.c
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@ -853,6 +853,18 @@ static void lsi_do_msgout(LSIState *s)
{
uint8_t msg;
int len;
uint32_t current_tag;
SCSIDevice *current_dev;
lsi_request *p, *p_next;
int id;
if (s->current) {
current_tag = s->current->tag;
} else {
current_tag = s->select_tag;
}
id = (current_tag >> 8) & 0xf;
current_dev = s->bus.devs[id];
DPRINTF("MSG out len=%d\n", s->dbc);
while (s->dbc) {
@ -898,6 +910,51 @@ static void lsi_do_msgout(LSIState *s)
BADF("ORDERED queue not implemented\n");
s->select_tag |= lsi_get_msgbyte(s) | LSI_TAG_VALID;
break;
case 0x0d:
/* The ABORT TAG message clears the current I/O process only. */
DPRINTF("MSG: ABORT TAG tag=0x%x\n", current_tag);
current_dev->info->cancel_io(current_dev, current_tag);
lsi_disconnect(s);
break;
case 0x06:
case 0x0e:
case 0x0c:
/* The ABORT message clears all I/O processes for the selecting
initiator on the specified logical unit of the target. */
if (msg == 0x06) {
DPRINTF("MSG: ABORT tag=0x%x\n", current_tag);
}
/* The CLEAR QUEUE message clears all I/O processes for all
initiators on the specified logical unit of the target. */
if (msg == 0x0e) {
DPRINTF("MSG: CLEAR QUEUE tag=0x%x\n", current_tag);
}
/* The BUS DEVICE RESET message clears all I/O processes for all
initiators on all logical units of the target. */
if (msg == 0x0c) {
DPRINTF("MSG: BUS DEVICE RESET tag=0x%x\n", current_tag);
}
/* clear the current I/O process */
current_dev->info->cancel_io(current_dev, current_tag);
/* As the current implemented devices scsi_disk and scsi_generic
only support one LUN, we don't need to keep track of LUNs.
Clearing I/O processes for other initiators could be possible
for scsi_generic by sending a SG_SCSI_RESET to the /dev/sgX
device, but this is currently not implemented (and seems not
to be really necessary). So let's simply clear all queued
commands for the current device: */
id = current_tag & 0x0000ff00;
QTAILQ_FOREACH_SAFE(p, &s->queue, next, p_next) {
if ((p->tag & 0x0000ff00) == id) {
current_dev->info->cancel_io(current_dev, p->tag);
QTAILQ_REMOVE(&s->queue, p, next);
}
}
lsi_disconnect(s);
break;
default:
if ((msg & 0x80) == 0) {
goto bad;