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scsi: notify the device when unit attention is reported 

Reporting media change events via unit attention sense codes requires
a small state machine: first report "NO MEDIUM", then report "MEDIUM MAY
HAVE CHANGED".  Unfortunately there is no good hooking point for the
device to notice that its pending unit attention condition has been
reported.  This patch reworks the generic machinery to add one.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-09-13 16:19:53 +02:00 committed by Kevin Wolf
parent af0e1ea2d3
commit 3653d8c40e
2 changed files with 29 additions and 5 deletions
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32
hw/scsi-bus.c
View File

@ -295,6 +295,13 @@ static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf)
r->len = scsi_device_get_sense(r->req.dev, r->buf,
MIN(req->cmd.xfer, sizeof r->buf),
(req->cmd.buf[1] & 1) == 0);
if (r->req.dev->sense_is_ua) {
if (r->req.dev->info->unit_attention_reported) {
r->req.dev->info->unit_attention_reported(req->dev);
}
r->req.dev->sense_len = 0;
r->req.dev->sense_is_ua = false;
}
break;
default:
scsi_req_build_sense(req, SENSE_CODE(LUN_NOT_SUPPORTED));
@ -383,7 +390,13 @@ SCSIRequest *scsi_req_new(SCSIDevice *d, uint32_t tag, uint32_t lun,
(buf[0] != INQUIRY &&
buf[0] != REPORT_LUNS &&
buf[0] != GET_CONFIGURATION &&
buf[0] != GET_EVENT_STATUS_NOTIFICATION)) {
buf[0] != GET_EVENT_STATUS_NOTIFICATION &&
/*
* If we already have a pending unit attention condition,
* report this one before triggering another one.
*/
!(buf[0] == REQUEST_SENSE && d->sense_is_ua))) {
req = scsi_req_alloc(&reqops_unit_attention, d, tag, lun,
hba_private);
} else if (lun != d->lun ||
@ -479,10 +492,15 @@ int scsi_req_get_sense(SCSIRequest *req, uint8_t *buf, int len)
*
* We assume UA_INTLCK_CTRL to be 00b for HBAs that support autosense, and
* 10b for HBAs that do not support it (do not call scsi_req_get_sense).
* In the latter case, scsi_req_complete clears unit attention conditions
* after moving them to the device's sense buffer.
* Here we handle unit attention clearing for UA_INTLCK_CTRL == 00b.
*/
scsi_clear_unit_attention(req);
if (req->dev->sense_is_ua) {
if (req->dev->info->unit_attention_reported) {
req->dev->info->unit_attention_reported(req->dev);
}
req->dev->sense_len = 0;
req->dev->sense_is_ua = false;
}
return ret;
}
@ -1082,8 +1100,12 @@ void scsi_req_complete(SCSIRequest *req, int status)
if (req->sense_len) {
memcpy(req->dev->sense, req->sense, req->sense_len);
req->dev->sense_len = req->sense_len;
req->dev->sense_is_ua = (req->ops == &reqops_unit_attention);
} else {
req->dev->sense_len = 0;
req->dev->sense_is_ua = false;
}
req->dev->sense_len = req->sense_len;
/*
* Unit attention state is now stored in the device's sense buffer

2
hw/scsi.h
View File

@ -62,6 +62,7 @@ struct SCSIDevice
BlockConf conf;
SCSIDeviceInfo *info;
SCSISense unit_attention;
bool sense_is_ua;
uint8_t sense[SCSI_SENSE_BUF_SIZE];
uint32_t sense_len;
QTAILQ_HEAD(, SCSIRequest) requests;
@ -92,6 +93,7 @@ struct SCSIDeviceInfo {
void (*destroy)(SCSIDevice *s);
SCSIRequest *(*alloc_req)(SCSIDevice *s, uint32_t tag, uint32_t lun,
void *hba_private);
void (*unit_attention_reported)(SCSIDevice *s);
SCSIReqOps reqops;
};