static int
cio_console_irq(void)
{
int irq;
if (console_irq != -1) {
/* VM provided us with the irq number of the console. */
if (stsch(console_irq, &console_subchannel.schib) != 0 ||
!console_subchannel.schib.pmcw.dnv)
return -1;
console_devno = console_subchannel.schib.pmcw.dev;
} else if (console_devno != -1) {
/* At least the console device number is known. */
for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
if (stsch(irq, &console_subchannel.schib) != 0)
break;
if (console_subchannel.schib.pmcw.dnv &&
console_subchannel.schib.pmcw.dev ==
console_devno) {
console_irq = irq;
break;
}
}
if (console_irq == -1)
return -1;
} else {
/* unlike in 2.4, we cannot autoprobe here, since
* the channel subsystem is not fully initialized.
* With some luck, the HWC console can take over */
printk(KERN_WARNING "No ccw console found!\n");
return -1;
}
return console_irq;
}
/* Make sure all subchannels are quiet before we re-ipl an lpar. */
void
reipl(unsigned long devno)
{
unsigned int schid;
local_irq_disable();
for (schid=0;schid<=highest_subchannel;schid++) {
struct schib schib;
if (stsch(schid, &schib))
goto out;
if (!schib.pmcw.ena)
continue;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
}
out:
do_reipl(devno);
}
static int
set_schib(struct ccw_device *cdev, u32 mme, int mbfc, unsigned long address)
{
int ret;
int retry;
struct subchannel *sch;
struct schib *schib;
sch = to_subchannel(cdev->dev.parent);
schib = &sch->schib;
/* msch can silently fail, so do it again if necessary */
for (retry = 0; retry < 3; retry++) {
/* prepare schib */
stsch(sch->schid, schib);
schib->pmcw.mme = mme;
schib->pmcw.mbfc = mbfc;
/* address can be either a block address or a block index */
if (mbfc)
schib->mba = address;
else
schib->pmcw.mbi = address;
/* try to submit it */
switch(ret = msch_err(sch->schid, schib)) {
case 0:
break;
case 1:
case 2: /* in I/O or status pending */
ret = -EBUSY;
break;
case 3: /* subchannel is no longer valid */
ret = -ENODEV;
break;
default: /* msch caught an exception */
ret = -EINVAL;
break;
}
stsch(sch->schid, schib); /* restore the schib */
if (ret)
break;
/* check if it worked */
if (schib->pmcw.mme == mme &&
schib->pmcw.mbfc == mbfc &&
(mbfc ? (schib->mba == address)
: (schib->pmcw.mbi == address)))
return 0;
ret = -EINVAL;
}
return ret;
}
static int
cio_get_console_sch_no(void)
{
struct subchannel_id schid;
init_subchannel_id(&schid);
if (console_irq != -1) {
/* VM provided us with the irq number of the console. */
schid.sch_no = console_irq;
if (stsch(schid, &console_subchannel.schib) != 0 ||
!console_subchannel.schib.pmcw.dnv)
return -1;
console_devno = console_subchannel.schib.pmcw.dev;
} else if (console_devno != -1) {
/* At least the console device number is known. */
for_each_subchannel(cio_test_for_console, NULL);
if (console_irq == -1)
return -1;
} else {
/* unlike in 2.4, we cannot autoprobe here, since
* the channel subsystem is not fully initialized.
* With some luck, the HWC console can take over */
printk(KERN_WARNING "No ccw console found!\n");
return -1;
}
return console_irq;
}
int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
{
static struct chsc_sda_area sda_area __initdata;
struct subchannel_id schid;
struct schib schib;
schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
if (!schid.one)
return -ENODEV;
if (schid.ssid) {
/*
* Firmware should have already enabled MSS but whoever started
* the kernel might have initiated a channel subsystem reset.
* Ensure that MSS is enabled.
*/
memset(&sda_area, 0, sizeof(sda_area));
if (__chsc_enable_facility(&sda_area, CHSC_SDA_OC_MSS))
return -ENODEV;
}
if (stsch(schid, &schib))
return -ENODEV;
if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
return -ENODEV;
if (!schib.pmcw.dnv)
return -ENODEV;
iplinfo->ssid = schid.ssid;
iplinfo->devno = schib.pmcw.dev;
iplinfo->is_qdio = schib.pmcw.qf;
return 0;
}
/*
* Function: cio_cancel
* Issues a "Cancel Subchannel" on the specified subchannel
* Note: We don't need any fancy intparms and flags here
* since xsch is executed synchronously.
* Only for common I/O internal use as for now.
*/
int
cio_cancel (struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT (2, "cancelIO");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
ccode = xsch (sch->irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
switch (ccode) {
case 0: /* success */
/* Update information in scsw. */
stsch (sch->irq, &sch->schib);
return 0;
case 1: /* status pending */
return -EBUSY;
case 2: /* not applicable */
return -EINVAL;
default: /* not oper */
return -ENODEV;
}
}
static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
{
struct schib schib;
if (stsch_reset(schid, &schib))
return -ENXIO;
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
switch (schib.pmcw.st) {
case SUBCHANNEL_TYPE_IO:
if (__clear_io_subchannel_easy(schid))
goto out; /* give up... */
break;
case SUBCHANNEL_TYPE_CHSC:
__clear_chsc_subchannel_easy();
break;
default:
/* No default clear strategy */
break;
}
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
out:
return 0;
}
/**
* cio_disable_subchannel - disable a subchannel.
* @sch: subchannel to disable
*/
int cio_disable_subchannel(struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
int retry;
int ret;
CIO_TRACE_EVENT (2, "dissch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return 0;
ccode = stsch (sch->schid, &sch->schib);
if (ccode == 3) /* Not operational. */
return -ENODEV;
if (scsw_actl(&sch->schib.scsw) != 0)
/*
* the disable function must not be called while there are
* requests pending for completion !
*/
return -EBUSY;
for (retry = 5, ret = 0; retry > 0; retry--) {
sch->schib.pmcw.ena = 0;
ret = cio_modify(sch);
if (ret == -ENODEV)
break;
if (ret == -EBUSY)
/*
* The subchannel is busy or status pending.
* We'll disable when the next interrupt was delivered
* via the state machine.
*/
break;
if (ret == 0) {
stsch (sch->schid, &sch->schib);
if (!sch->schib.pmcw.ena)
break;
}
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
/**
* cio_enable_subchannel - enable a subchannel.
* @sch: subchannel to be enabled
* @intparm: interruption parameter to set
*/
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
{
char dbf_txt[15];
int ccode;
int retry;
int ret;
CIO_TRACE_EVENT (2, "ensch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return -EINVAL;
ccode = stsch (sch->schid, &sch->schib);
if (ccode)
return -ENODEV;
for (retry = 5, ret = 0; retry > 0; retry--) {
sch->schib.pmcw.ena = 1;
sch->schib.pmcw.isc = sch->isc;
sch->schib.pmcw.intparm = intparm;
ret = cio_modify(sch);
if (ret == -ENODEV)
break;
if (ret == -EIO)
/*
* Got a program check in cio_modify. Try without
* the concurrent sense bit the next time.
*/
sch->schib.pmcw.csense = 0;
if (ret == 0) {
stsch (sch->schid, &sch->schib);
if (sch->schib.pmcw.ena)
break;
}
if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
}
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
/**
* 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;
}
/*
* Enable subchannel.
*/
int
cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
{
char dbf_txt[15];
int ccode;
int retry;
int ret;
CIO_TRACE_EVENT (2, "ensch");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
ccode = stsch (sch->irq, &sch->schib);
if (ccode)
return -ENODEV;
for (retry = 5, ret = 0; retry > 0; retry--) {
sch->schib.pmcw.ena = 1;
sch->schib.pmcw.isc = isc;
sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
ret = cio_modify(sch);
if (ret == -ENODEV)
break;
if (ret == -EIO)
/*
* Got a program check in cio_modify. Try without
* the concurrent sense bit the next time.
*/
sch->schib.pmcw.csense = 0;
if (ret == 0) {
stsch (sch->irq, &sch->schib);
if (sch->schib.pmcw.ena)
break;
}
if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->irq, &irb) != 0)
break;
}
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
/*
* 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;
}
static int cio_test_for_console(struct subchannel_id schid, void *data)
{
struct schib schib;
if (stsch(schid, &schib) != 0)
return -ENXIO;
if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
(schib.pmcw.dev == console_devno)) {
console_irq = schid.sch_no;
return 1; /* found */
}
return 0;
}
/*
* Disable subchannel.
*/
int
cio_disable_subchannel (struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
int retry;
int ret;
sprintf (dbf_txt, "dissch%x", sch->irq);
CIO_TRACE_EVENT (2, dbf_txt);
ccode = stsch (sch->irq, &sch->schib);
if (ccode == 3) /* Not operational. */
return -ENODEV;
if (sch->schib.scsw.actl != 0)
/*
* the disable function must not be called while there are
* requests pending for completion !
*/
return -EBUSY;
sch->schib.pmcw.ena = 0;
for (retry = 5, ret = 0; retry > 0; retry--) {
ret = cio_modify(sch);
if (ret == -ENODEV)
break;
if (ret == 0) {
stsch (sch->irq, &sch->schib);
if (!sch->schib.pmcw.ena)
break;
}
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
/* Clear all subchannels. */
void
clear_all_subchannels(void)
{
unsigned int schid;
local_irq_disable();
for (schid=0;schid<=highest_subchannel;schid++) {
struct schib schib;
if (stsch(schid, &schib))
break; /* break out of the loop */
if (!schib.pmcw.ena)
continue;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... jump out of switch */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
}
}
static int stsch_reset(struct subchannel_id schid, struct schib *addr)
{
int rc;
pgm_check_occured = 0;
s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
rc = stsch(schid, addr);
s390_base_pgm_handler_fn = NULL;
/* The program check handler could have changed pgm_check_occured. */
barrier();
if (pgm_check_occured)
return -EIO;
else
return rc;
}
static inline int
__disable_subchannel_easy(unsigned int 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);
stsch(schid, schib);
if (!schib->pmcw.ena)
return 0;
}
return -EBUSY; /* uhm... */
}
static inline int
css_get_subchannel_status(struct subchannel *sch, int schid)
{
struct schib schib;
int cc;
cc = stsch(schid, &schib);
if (cc)
return CIO_GONE;
if (!schib.pmcw.dnv)
return CIO_GONE;
if (sch && sch->schib.pmcw.dnv &&
(schib.pmcw.dev != sch->schib.pmcw.dev))
return CIO_REVALIDATE;
if (sch && !sch->lpm)
return CIO_NO_PATH;
return CIO_OPER;
}
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... */
}
static int cio_get_console_sch_no(void)
{
struct subchannel_id schid;
struct schib schib;
init_subchannel_id(&schid);
if (console_irq != -1) {
/* VM provided us with the irq number of the console. */
schid.sch_no = console_irq;
if (stsch(schid, &schib) != 0 ||
(schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
return -1;
console_devno = schib.pmcw.dev;
} else if (console_devno != -1) {
/* At least the console device number is known. */
for_each_subchannel(cio_test_for_console, NULL);
}
return console_irq;
}
/**
* 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 inline int
cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
{
char dbf_text[15];
if (lpm != 0)
sch->lpm &= ~lpm;
else
sch->lpm = 0;
stsch (sch->irq, &sch->schib);
CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "
"subchannel %04x!\n", sch->irq);
sprintf(dbf_text, "no%s", sch->dev.bus_id);
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
return (sch->lpm ? -EACCES : -ENODEV);
}
static int
cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
{
char dbf_text[15];
if (lpm != 0)
sch->lpm &= ~lpm;
else
sch->lpm = 0;
stsch (sch->schid, &sch->schib);
CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
"subchannel 0.%x.%04x!\n", sch->schid.ssid,
sch->schid.sch_no);
sprintf(dbf_text, "no%s", dev_name(&sch->dev));
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
return (sch->lpm ? -EACCES : -ENODEV);
}
static int
__shutdown_subchannel_easy(struct subchannel_id schid, void *data)
{
struct schib schib;
if (stsch_err(schid, &schib))
return -ENXIO;
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
case 0:
case -ENODEV:
break;
default: /* -EBUSY */
if (__clear_subchannel_easy(schid))
break; /* give up... */
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
return 0;
}
/*
* 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, unsigned int irq)
{
char dbf_txt[15];
int ccode;
sprintf (dbf_txt, "valsch%x", irq);
CIO_TRACE_EVENT (4, dbf_txt);
/* Nuke all fields. */
memset(sch, 0, sizeof(struct subchannel));
spin_lock_init(&sch->lock);
/* Set a name for the subchannel */
snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.0.%04x", irq);
/*
* The first subchannel that is not-operational (ccode==3)
* indicates that there aren't any more devices available.
*/
sch->irq = irq;
ccode = stsch (irq, &sch->schib);
if (ccode)
return -ENXIO;
/* 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 %04X reports "
"non-I/O subchannel type %04X\n",
sch->irq, 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->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\n", sch->schib.pmcw.dev);
return -ENODEV;
}
sch->opm = 0xff;
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 %04X"
" - PIM = %02X, PAM = %02X, POM = %02X\n",
sch->schib.pmcw.dev, sch->irq, 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;
}
}
__setup("ccw_timeout_log", ccw_timeout_log_setup);
static void ccw_timeout_log(struct ccw_device *cdev)
{
struct schib schib;
struct subchannel *sch;
struct io_subchannel_private *private;
union orb *orb;
int cc;
sch = to_subchannel(cdev->dev.parent);
private = to_io_private(sch);
orb = &private->orb;
cc = stsch(sch->schid, &schib);
printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
"device information:\n", get_clock());
printk(KERN_WARNING "cio: orb:\n");
print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
orb, sizeof(*orb), 0);
printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id);
printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id);
printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
"vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
if (orb->tm.b) {
printk(KERN_WARNING "cio: orb indicates transport mode\n");
printk(KERN_WARNING "cio: last tcw:\n");
print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
