/**
* 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);
/* Nuke all fields. */
memset(sch, 0, sizeof(struct subchannel));
sch->schid = schid;
if (cio_is_console(schid)) {
sch->lock = cio_get_console_lock();
} else {
err = cio_create_sch_lock(sch);
if (err)
goto out;
}
mutex_init(&sch->reg_mutex);
/*
* 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_err (schid, &sch->schib);
if (ccode) {
err = (ccode == 3) ? -ENXIO : ccode;
goto out;
}
/* Copy subchannel type from path management control word. */
sch->st = sch->schib.pmcw.st;
switch (sch->st) {
case SUBCHANNEL_TYPE_IO:
err = cio_validate_io_subchannel(sch);
break;
case SUBCHANNEL_TYPE_MSG:
err = cio_validate_msg_subchannel(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);
return 0;
out:
if (!cio_is_console(schid))
kfree(sch->lock);
sch->lock = NULL;
return err;
}
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);
memset(sch, 0, sizeof(struct subchannel));
sch->schid = schid;
if (cio_is_console(schid)) {
sch->lock = cio_get_console_lock();
} else {
err = cio_create_sch_lock(sch);
if (err)
goto out;
}
mutex_init(&sch->reg_mutex);
ccode = stsch_err (schid, &sch->schib);
if (ccode) {
err = (ccode == 3) ? -ENXIO : ccode;
goto out;
}
sch->st = sch->schib.pmcw.st;
switch (sch->st) {
case SUBCHANNEL_TYPE_IO:
err = cio_validate_io_subchannel(sch);
break;
case SUBCHANNEL_TYPE_MSG:
err = cio_validate_msg_subchannel(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);
return 0;
out:
if (!cio_is_console(schid))
kfree(sch->lock);
sch->lock = NULL;
return err;
}
static void
css_subchannel_release(struct device *dev)
{
struct subchannel *sch;
sch = to_subchannel(dev);
if (!cio_is_console(sch->irq))
kfree(sch);
}
/*
* cio_validate_subchannel()
*
* Find out subchannel type and initialize struct subchannel.
* Return codes:
* SUBCHANNEL_TYPE_IO for a normal io subchannel
* SUBCHANNEL_TYPE_CHSC for a chsc subchannel
* SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel
* SUBCHANNEL_TYPE_ADM for a adm(?) subchannel
* -ENXIO for non-defined subchannels
* -ENODEV for subchannels with invalid device number or blacklisted devices
*/
int
cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
{
char dbf_txt[15];
int ccode;
sprintf (dbf_txt, "valsch%x", schid.sch_no);
CIO_TRACE_EVENT (4, dbf_txt);
/* Nuke all fields. */
memset(sch, 0, sizeof(struct subchannel));
spin_lock_init(&sch->lock);
mutex_init(&sch->reg_mutex);
/* Set a name for the subchannel */
snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
schid.sch_no);
/*
* 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_err (schid, &sch->schib);
if (ccode)
return (ccode == 3) ? -ENXIO : ccode;
sch->schid = schid;
/* Copy subchannel type from path management control word. */
sch->st = sch->schib.pmcw.st;
/*
* ... just being curious we check for non I/O subchannels
*/
if (sch->st != 0) {
CIO_DEBUG(KERN_INFO, 0,
"Subchannel 0.%x.%04x reports "
"non-I/O subchannel type %04X\n",
sch->schid.ssid, sch->schid.sch_no, sch->st);
/* We stop here for non-io subchannels. */
return sch->st;
}
/* Initialization for io subchannels. */
if (!sch->schib.pmcw.dnv)
/* io subchannel but device number is invalid. */
return -ENODEV;
/* Devno is valid. */
if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
/*
* This device must not be known to Linux. So we simply
* say that there is no device and return ENODEV.
*/
CIO_MSG_EVENT(0, "Blacklisted device detected "
"at devno %04X, subchannel set %x\n",
sch->schib.pmcw.dev, sch->schid.ssid);
return -ENODEV;
}
sch->opm = 0xff;
if (!cio_is_console(sch->schid))
chsc_validate_chpids(sch);
sch->lpm = sch->schib.pmcw.pim &
sch->schib.pmcw.pam &
sch->schib.pmcw.pom &
sch->opm;
CIO_DEBUG(KERN_INFO, 0,
"Detected device %04x on subchannel 0.%x.%04X"
" - PIM = %02X, PAM = %02X, POM = %02X\n",
sch->schib.pmcw.dev, sch->schid.ssid,
sch->schid.sch_no, sch->schib.pmcw.pim,
sch->schib.pmcw.pam, sch->schib.pmcw.pom);
/*
* We now have to initially ...
* ... set "interruption subclass"
* ... enable "concurrent sense"
* ... enable "multipath mode" if more than one
* CHPID is available. This is done regardless
* whether multiple paths are available for us.
*/
sch->schib.pmcw.isc = 3; /* could be smth. else */
sch->schib.pmcw.csense = 1; /* concurrent sense */
sch->schib.pmcw.ena = 0;
if ((sch->lpm & (sch->lpm - 1)) != 0)
sch->schib.pmcw.mp = 1; /* multipath mode */
return 0;
}
