int
cio_cancel (struct subchannel *sch)
{
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT(2, "cancelIO");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
ccode = xsch (sch->schid);
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
if (cio_update_schib(sch))
return -ENODEV;
return 0;
case 1:
return -EBUSY;
case 2:
return -EINVAL;
default:
return -ENODEV;
}
}
int cio_disable_subchannel(struct subchannel *sch)
{
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;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 0;
for (retry = 0; retry < 3; retry++) {
ret = cio_commit_config(sch);
if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
} else
break;
}
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
int
cio_halt(struct subchannel *sch)
{
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT(2, "haltIO");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
ccode = hsch (sch->schid);
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
return 0;
case 1:
case 2:
return -EBUSY;
default:
return -ENODEV;
}
}
/*
* resume suspended I/O operation
*/
int
cio_resume (struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
CIO_TRACE_EVENT (4, "resIO");
CIO_TRACE_EVENT (4, sch->dev.bus_id);
ccode = rsch (sch->irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (4, dbf_txt);
switch (ccode) {
case 0:
sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND;
return 0;
case 1:
return -EBUSY;
case 2:
return -EINVAL;
default:
/*
* useless to wait for request completion
* as device is no longer operational !
*/
return -ENODEV;
}
}
/**
* 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)
{
int ret;
CIO_TRACE_EVENT(2, "ensch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return -EINVAL;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 1;
sch->config.isc = sch->isc;
sch->config.intparm = intparm;
ret = cio_commit_config(sch);
if (ret == -EIO) {
/*
* Got a program check in msch. Try without
* the concurrent sense bit the next time.
*/
sch->config.csense = 0;
ret = cio_commit_config(sch);
}
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
/*
* halt I/O operation
*/
int
cio_halt(struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT (2, "haltIO");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
/*
* Issue "Halt subchannel" and process condition code
*/
ccode = hsch (sch->irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
switch (ccode) {
case 0:
sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND;
return 0;
case 1: /* status pending */
case 2: /* busy */
return -EBUSY;
default: /* device not operational */
return -ENODEV;
}
}
/*
* Clear I/O operation
*/
int
cio_clear(struct subchannel *sch)
{
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT(2, "clearIO");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
/*
* Issue "Clear subchannel" and process condition code
*/
ccode = csch (sch->schid);
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
return 0;
default: /* device not operational */
return -ENODEV;
}
}
/*
* 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)
{
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT(2, "cancelIO");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
ccode = xsch (sch->schid);
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
switch (ccode) {
case 0: /* success */
/* Update information in scsw. */
if (cio_update_schib(sch))
return -ENODEV;
return 0;
case 1: /* status pending */
return -EBUSY;
case 2: /* not applicable */
return -EINVAL;
default: /* not oper */
return -ENODEV;
}
}
/*
* halt I/O operation
*/
int
cio_halt(struct subchannel *sch)
{
int ccode;
if (!sch)
return -ENODEV;
CIO_TRACE_EVENT(2, "haltIO");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
/*
* Issue "Halt subchannel" and process condition code
*/
ccode = hsch (sch->schid);
CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
return 0;
case 1: /* status pending */
case 2: /* busy */
return -EBUSY;
default: /* device not operational */
return -ENODEV;
}
}
/*
* resume suspended I/O operation
*/
int
cio_resume (struct subchannel *sch)
{
int ccode;
CIO_TRACE_EVENT(4, "resIO");
CIO_TRACE_EVENT(4, dev_name(&sch->dev));
ccode = rsch (sch->schid);
CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
return 0;
case 1:
return -EBUSY;
case 2:
return -EINVAL;
default:
/*
* useless to wait for request completion
* as device is no longer operational !
*/
return -ENODEV;
}
}
/*
* 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;
sprintf (dbf_txt, "cancelIO%x", sch->irq);
CIO_TRACE_EVENT (2, dbf_txt);
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;
}
}
/*
* Clear I/O operation
*/
int
cio_clear(struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
if (!sch)
return -ENODEV;
sprintf (dbf_txt, "clearIO%x", sch->irq);
CIO_TRACE_EVENT (2, dbf_txt);
/*
* Issue "Clear subchannel" and process condition code
*/
ccode = csch (sch->irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
switch (ccode) {
case 0:
sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND;
return 0;
default: /* device not operational */
return -ENODEV;
}
}
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
{
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;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 1;
sch->config.isc = sch->isc;
sch->config.intparm = intparm;
for (retry = 0; retry < 3; retry++) {
ret = cio_commit_config(sch);
if (ret == -EIO) {
sch->config.csense = 0;
} else if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
} else
break;
}
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
int
cio_start_key (struct subchannel *sch, /* subchannel structure */
struct ccw1 * cpa, /* logical channel prog addr */
__u8 lpm, /* logical path mask */
__u8 key) /* storage key */
{
char dbf_txt[15];
int ccode;
union orb *orb;
CIO_TRACE_EVENT(4, "stIO");
CIO_TRACE_EVENT(4, dev_name(&sch->dev));
orb = &to_io_private(sch)->orb;
memset(orb, 0, sizeof(union orb));
/* sch is always under 2G. */
orb->cmd.intparm = (u32)(addr_t)sch;
orb->cmd.fmt = 1;
orb->cmd.pfch = sch->options.prefetch == 0;
orb->cmd.spnd = sch->options.suspend;
orb->cmd.ssic = sch->options.suspend && sch->options.inter;
orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
#ifdef CONFIG_64BIT
/*
* for 64 bit we always support 64 bit IDAWs with 4k page size only
*/
orb->cmd.c64 = 1;
orb->cmd.i2k = 0;
#endif
orb->cmd.key = key >> 4;
/* issue "Start Subchannel" */
orb->cmd.cpa = (__u32) __pa(cpa);
ccode = ssch(sch->schid, orb);
/* process condition code */
sprintf(dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT(4, dbf_txt);
switch (ccode) {
case 0:
/*
* initialize device status information
*/
sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
return 0;
case 1: /* status pending */
case 2: /* busy */
return -EBUSY;
case 3: /* device/path not operational */
return cio_start_handle_notoper(sch, lpm);
default:
return ccode;
}
}
int
cio_start_key (struct subchannel *sch, /* subchannel structure */
struct ccw1 * cpa, /* logical channel prog addr */
__u8 lpm, /* logical path mask */
__u8 key) /* storage key */
{
char dbf_txt[15];
int ccode;
CIO_TRACE_EVENT (4, "stIO");
CIO_TRACE_EVENT (4, sch->dev.bus_id);
/* sch is always under 2G. */
sch->orb.intparm = (__u32)(unsigned long)sch;
sch->orb.fmt = 1;
sch->orb.pfch = sch->options.prefetch == 0;
sch->orb.spnd = sch->options.suspend;
sch->orb.ssic = sch->options.suspend && sch->options.inter;
sch->orb.lpm = (lpm != 0) ? (lpm & sch->opm) : sch->lpm;
#ifdef CONFIG_ARCH_S390X
/*
* for 64 bit we always support 64 bit IDAWs with 4k page size only
*/
sch->orb.c64 = 1;
sch->orb.i2k = 0;
#endif
sch->orb.key = key >> 4;
/* issue "Start Subchannel" */
sch->orb.cpa = (__u32) __pa (cpa);
ccode = ssch (sch->irq, &sch->orb);
/* process condition code */
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (4, dbf_txt);
switch (ccode) {
case 0:
/*
* initialize device status information
*/
sch->schib.scsw.actl |= SCSW_ACTL_START_PEND;
return 0;
case 1: /* status pending */
case 2: /* busy */
return -EBUSY;
default: /* device/path not operational */
return cio_start_handle_notoper(sch, lpm);
}
}
/**
* s390_register_adapter_interrupt() - register adapter interrupt handler
* @handler: adapter handler to be registered
* @drv_data: driver data passed with each call to the handler
* @isc: isc for which the handler should be called
*
* Returns:
* Pointer to the indicator to be used on success
* ERR_PTR() if registration failed
*/
void *s390_register_adapter_interrupt(adapter_int_handler_t handler,
void *drv_data, u8 isc)
{
struct airq_t *airq;
char dbf_txt[16];
int ret;
if (isc > MAX_ISC)
return ERR_PTR(-EINVAL);
airq = kmalloc(sizeof(struct airq_t), GFP_KERNEL);
if (!airq) {
ret = -ENOMEM;
goto out;
}
airq->handler = handler;
airq->drv_data = drv_data;
ret = register_airq(airq, isc);
out:
snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%d", ret);
CIO_TRACE_EVENT(4, dbf_txt);
if (ret < 0) {
kfree(airq);
return ERR_PTR(ret);
} else
return &indicators[isc].byte[ret];
}
/*
* Function: s390_redo_validation
* Look for no longer blacklisted devices
* FIXME: there must be a better way to do this */
static inline void
s390_redo_validation (void)
{
unsigned int irq;
CIO_TRACE_EVENT (0, "redoval");
for (irq = 0; irq <= __MAX_SUBCHANNELS; irq++) {
int ret;
struct subchannel *sch;
sch = get_subchannel_by_schid(irq);
if (sch) {
/* Already known. */
put_device(&sch->dev);
continue;
}
ret = css_probe_device(irq);
if (ret == -ENXIO)
break; /* We're through. */
if (ret == -ENOMEM)
/*
* Stop validation for now. Bad, but no need for a
* panic.
*/
break;
}
}
/*
* Function: s390_vary_chpid
* Varies the specified chpid online or offline
*/
static int s390_vary_chpid(struct chp_id chpid, int on)
{
char dbf_text[15];
int status;
sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid,
chpid.id);
CIO_TRACE_EVENT(2, dbf_text);
status = chp_get_status(chpid);
if (status < 0) {
printk(KERN_ERR "Can't vary unknown chpid %x.%02x\n",
chpid.cssid, chpid.id);
return -EINVAL;
}
if (!on && !status) {
printk(KERN_ERR "chpid %x.%02x is already offline\n",
chpid.cssid, chpid.id);
return -EINVAL;
}
set_chp_logically_online(chpid, on);
chsc_chp_vary(chpid, on);
return 0;
}
int
cio_start_key (struct subchannel *sch,
struct ccw1 * cpa,
__u8 lpm,
__u8 key)
{
struct io_subchannel_private *priv = to_io_private(sch);
union orb *orb = &priv->orb;
int ccode;
CIO_TRACE_EVENT(5, "stIO");
CIO_TRACE_EVENT(5, dev_name(&sch->dev));
memset(orb, 0, sizeof(union orb));
orb->cmd.intparm = (u32)(addr_t)sch;
orb->cmd.fmt = 1;
orb->cmd.pfch = priv->options.prefetch == 0;
orb->cmd.spnd = priv->options.suspend;
orb->cmd.ssic = priv->options.suspend && priv->options.inter;
orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
#ifdef CONFIG_64BIT
orb->cmd.c64 = 1;
orb->cmd.i2k = 0;
#endif
orb->cmd.key = key >> 4;
orb->cmd.cpa = (__u32) __pa(cpa);
ccode = ssch(sch->schid, orb);
CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
return 0;
case 1:
case 2:
return -EBUSY;
case 3:
return cio_start_handle_notoper(sch, lpm);
default:
return ccode;
}
}
void
do_adapter_IO (void)
{
CIO_TRACE_EVENT (6, "doaio");
if (adapter_handler)
(*adapter_handler) ();
}
/**
* 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;
}
/**
* 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_disable_subchannel - disable a subchannel.
* @sch: subchannel to disable
*/
int cio_disable_subchannel(struct subchannel *sch)
{
int ret;
CIO_TRACE_EVENT(2, "dissch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return 0;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 0;
ret = cio_commit_config(sch);
CIO_HEX_EVENT(2, &ret, sizeof(ret));
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;
}
/*
* 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;
}
static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
{
struct irb *irb = &cdev->private->irb;
struct cmd_scsw *scsw = &irb->scsw.cmd;
enum uc_todo todo;
if (ccw_device_accumulate_and_sense(cdev, lcirb))
return IO_RUNNING;
if (scsw->fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
return IO_KILLED;
if (scsw->cc == 3 || scsw->pno)
return IO_PATH_ERROR;
if (irb->esw.esw0.erw.cons) {
CIO_TRACE_EVENT(2, "sensedata");
CIO_HEX_EVENT(2, &cdev->private->dev_id,
sizeof(struct ccw_dev_id));
CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);
if (irb->ecw[0] & SNS0_CMD_REJECT)
return IO_REJECTED;
if (cdev->drv && cdev->drv->uc_handler) {
todo = cdev->drv->uc_handler(cdev, lcirb);
CIO_TRACE_EVENT(2, "uc_response");
CIO_HEX_EVENT(2, &todo, sizeof(todo));
switch (todo) {
case UC_TODO_RETRY:
return IO_STATUS_ERROR;
case UC_TODO_RETRY_ON_NEW_PATH:
return IO_PATH_ERROR;
case UC_TODO_STOP:
return IO_REJECTED;
default:
return IO_STATUS_ERROR;
}
}
return IO_STATUS_ERROR;
}
/*
* Return the status of the internal I/O started on the specified ccw device.
* Perform BASIC SENSE if required.
*/
static enum io_status ccwreq_status(struct ccw_device *cdev, struct irb *lcirb)
{
struct irb *irb = &cdev->private->irb;
struct cmd_scsw *scsw = &irb->scsw.cmd;
enum uc_todo todo;
/* Perform BASIC SENSE if needed. */
if (ccw_device_accumulate_and_sense(cdev, lcirb))
return IO_RUNNING;
/* Check for halt/clear interrupt. */
if (scsw->fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
return IO_KILLED;
/* Check for path error. */
if (scsw->cc == 3 || scsw->pno)
return IO_PATH_ERROR;
/* Handle BASIC SENSE data. */
if (irb->esw.esw0.erw.cons) {
CIO_TRACE_EVENT(2, "sensedata");
CIO_HEX_EVENT(2, &cdev->private->dev_id,
sizeof(struct ccw_dev_id));
CIO_HEX_EVENT(2, &cdev->private->irb.ecw, SENSE_MAX_COUNT);
/* Check for command reject. */
if (irb->ecw[0] & SNS0_CMD_REJECT)
return IO_REJECTED;
/* Ask the driver what to do */
if (cdev->drv && cdev->drv->uc_handler) {
todo = cdev->drv->uc_handler(cdev, lcirb);
CIO_TRACE_EVENT(2, "uc_response");
CIO_HEX_EVENT(2, &todo, sizeof(todo));
switch (todo) {
case UC_TODO_RETRY:
return IO_STATUS_ERROR;
case UC_TODO_RETRY_ON_NEW_PATH:
return IO_PATH_ERROR;
case UC_TODO_STOP:
return IO_REJECTED;
default:
return IO_STATUS_ERROR;
}
}
/* Assume that unexpected SENSE data implies an error. */
return IO_STATUS_ERROR;
}
int
s390_unregister_adapter_interrupt (adapter_int_handler_t handler)
{
int ret;
char dbf_txt[15];
CIO_TRACE_EVENT (4, "urgaint");
if (handler == NULL)
ret = -EINVAL;
else {
adapter_handler = NULL;
synchronize_sched(); /* Allow interrupts to complete. */
ret = 0;
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
return ret;
}
/*
* register for adapter interrupts
*
* With HiperSockets the zSeries architecture provides for
* means of adapter interrups, pseudo I/O interrupts that are
* not tied to an I/O subchannel, but to an adapter. However,
* it doesn't disclose the info how to enable/disable them, but
* to recognize them only. Perhaps we should consider them
* being shared interrupts, and thus build a linked list
* of adapter handlers ... to be evaluated ...
*/
int
s390_register_adapter_interrupt (adapter_int_handler_t handler)
{
int ret;
char dbf_txt[15];
CIO_TRACE_EVENT (4, "rgaint");
if (handler == NULL)
ret = -EINVAL;
else
ret = (cmpxchg(&adapter_handler, NULL, handler) ? -EBUSY : 0);
if (!ret)
synchronize_sched(); /* Allow interrupts to complete. */
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
return ret;
}
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;
}
