static int cio_validate_msg_subchannel(struct subchannel *sch)
{
/* Initialization for message subchannels. */
if (!css_sch_is_valid(&sch->schib))
return -ENODEV;
/* Devno is valid. */
return cio_check_devno_blacklisted(sch);
}
/**
* cio_update_schib - Perform stsch and update schib if subchannel is valid.
* @sch: subchannel on which to perform stsch
* Return zero on success, -ENODEV otherwise.
*/
int cio_update_schib(struct subchannel *sch)
{
struct schib schib;
if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
return -ENODEV;
memcpy(&sch->schib, &schib, sizeof(schib));
return 0;
}
/*
* cio_commit_config - apply configuration to the subchannel
*/
int cio_commit_config(struct subchannel *sch)
{
int ccode, retry, ret = 0;
struct schib schib;
struct irb irb;
if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
return -ENODEV;
for (retry = 0; retry < 5; retry++) {
/* copy desired changes to local schib */
cio_apply_config(sch, &schib);
ccode = msch(sch->schid, &schib);
if (ccode < 0) /* -EIO if msch gets a program check. */
return ccode;
switch (ccode) {
case 0: /* successful */
if (stsch(sch->schid, &schib) ||
!css_sch_is_valid(&schib))
return -ENODEV;
if (cio_check_config(sch, &schib)) {
/* commit changes from local schib */
memcpy(&sch->schib, &schib, sizeof(schib));
return 0;
}
ret = -EAGAIN;
break;
case 1: /* status pending */
ret = -EBUSY;
if (tsch(sch->schid, &irb))
return ret;
break;
case 2: /* busy */
udelay(100); /* allow for recovery */
ret = -EBUSY;
break;
case 3: /* not operational */
return -ENODEV;
}
}
return ret;
}
int cio_commit_config(struct subchannel *sch)
{
struct schib schib;
int ccode, retry, ret = 0;
if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib))
return -ENODEV;
for (retry = 0; retry < 5; retry++) {
cio_apply_config(sch, &schib);
ccode = msch_err(sch->schid, &schib);
if (ccode < 0)
return ccode;
switch (ccode) {
case 0:
if (stsch_err(sch->schid, &schib) ||
!css_sch_is_valid(&schib))
return -ENODEV;
if (cio_check_config(sch, &schib)) {
memcpy(&sch->schib, &schib, sizeof(schib));
return 0;
}
ret = -EAGAIN;
break;
case 1:
return -EBUSY;
case 2:
udelay(100);
ret = -EBUSY;
break;
case 3:
return -ENODEV;
}
}
return ret;
}
static int
__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
{
int retry, cc;
cc = 0;
for (retry=0;retry<3;retry++) {
schib->pmcw.ena = 0;
cc = msch(schid, schib);
if (cc)
return (cc==3?-ENODEV:-EBUSY);
if (stsch(schid, schib) || !css_sch_is_valid(schib))
return -ENODEV;
if (!schib->pmcw.ena)
return 0;
}
return -EBUSY; /* uhm... */
}
/**
* cio_validate_subchannel - basic validation of subchannel
* @sch: subchannel structure to be filled out
* @schid: subchannel id
*
* Find out subchannel type and initialize struct subchannel.
* Return codes:
* 0 on success
* -ENXIO for non-defined subchannels
* -ENODEV for invalid subchannels or blacklisted devices
* -EIO for subchannels in an invalid subchannel set
*/
int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
{
char dbf_txt[15];
int ccode;
int err;
sprintf(dbf_txt, "valsch%x", schid.sch_no);
CIO_TRACE_EVENT(4, dbf_txt);
/*
* The first subchannel that is not-operational (ccode==3)
* indicates that there aren't any more devices available.
* If stsch gets an exception, it means the current subchannel set
* is not valid.
*/
ccode = stsch(schid, &sch->schib);
if (ccode) {
err = (ccode == 3) ? -ENXIO : ccode;
goto out;
}
sch->st = sch->schib.pmcw.st;
sch->schid = schid;
switch (sch->st) {
case SUBCHANNEL_TYPE_IO:
case SUBCHANNEL_TYPE_MSG:
if (!css_sch_is_valid(&sch->schib))
err = -ENODEV;
else
err = cio_check_devno_blacklisted(sch);
break;
default:
err = 0;
}
if (err)
goto out;
CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
sch->schid.ssid, sch->schid.sch_no, sch->st);
out:
return err;
}
static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
{
struct schib schib;
if (!slow) {
/* Will be done on the slow path. */
return -EAGAIN;
}
if (stsch_err(schid, &schib)) {
/* Subchannel is not provided. */
return -ENXIO;
}
if (!css_sch_is_valid(&schib)) {
/* Unusable - ignore. */
return 0;
}
CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid,
schid.sch_no);
return css_probe_device(schid);
}
