linux/drivers/s390/cio/device_ops.c
Sebastian Ott 50c8e31f38 [S390] cio: provide fake irb for transport mode IO
If a driver wants to do command mode IO while CIO is doing
online path verification we ignore this request and provide
a fake irb when we are done and the driver can do IO again.

For transport mode IO we have no such mechanism, giving the
driver no other chance then to retry the action until we are
done. This is not very reliable.

Provide a fake irb for transport mode IO as well.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2011-12-01 13:32:18 +01:00

782 lines
24 KiB
C

/*
* Copyright IBM Corp. 2002, 2009
*
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <asm/ccwdev.h>
#include <asm/idals.h>
#include <asm/chpid.h>
#include <asm/fcx.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc.h"
#include "device.h"
#include "chp.h"
/**
* ccw_device_set_options_mask() - set some options and unset the rest
* @cdev: device for which the options are to be set
* @flags: options to be set
*
* All flags specified in @flags are set, all flags not specified in @flags
* are cleared.
* Returns:
* %0 on success, -%EINVAL on an invalid flag combination.
*/
int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
{
/*
* The flag usage is mutal exclusive ...
*/
if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
(flags & CCWDEV_REPORT_ALL))
return -EINVAL;
cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0;
return 0;
}
/**
* ccw_device_set_options() - set some options
* @cdev: device for which the options are to be set
* @flags: options to be set
*
* All flags specified in @flags are set, the remainder is left untouched.
* Returns:
* %0 on success, -%EINVAL if an invalid flag combination would ensue.
*/
int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
{
/*
* The flag usage is mutal exclusive ...
*/
if (((flags & CCWDEV_EARLY_NOTIFICATION) &&
(flags & CCWDEV_REPORT_ALL)) ||
((flags & CCWDEV_EARLY_NOTIFICATION) &&
cdev->private->options.repall) ||
((flags & CCWDEV_REPORT_ALL) &&
cdev->private->options.fast))
return -EINVAL;
cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0;
cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0;
cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0;
cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0;
return 0;
}
/**
* ccw_device_clear_options() - clear some options
* @cdev: device for which the options are to be cleared
* @flags: options to be cleared
*
* All flags specified in @flags are cleared, the remainder is left untouched.
*/
void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
{
cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0;
cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0;
cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0;
cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0;
}
/**
* ccw_device_is_pathgroup - determine if paths to this device are grouped
* @cdev: ccw device
*
* Return non-zero if there is a path group, zero otherwise.
*/
int ccw_device_is_pathgroup(struct ccw_device *cdev)
{
return cdev->private->flags.pgroup;
}
EXPORT_SYMBOL(ccw_device_is_pathgroup);
/**
* ccw_device_is_multipath - determine if device is operating in multipath mode
* @cdev: ccw device
*
* Return non-zero if device is operating in multipath mode, zero otherwise.
*/
int ccw_device_is_multipath(struct ccw_device *cdev)
{
return cdev->private->flags.mpath;
}
EXPORT_SYMBOL(ccw_device_is_multipath);
/**
* ccw_device_clear() - terminate I/O request processing
* @cdev: target ccw device
* @intparm: interruption parameter; value is only used if no I/O is
* outstanding, otherwise the intparm associated with the I/O request
* is returned
*
* ccw_device_clear() calls csch on @cdev's subchannel.
* Returns:
* %0 on success,
* -%ENODEV on device not operational,
* -%EINVAL on invalid device state.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
{
struct subchannel *sch;
int ret;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE &&
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
ret = cio_clear(sch);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
/**
* ccw_device_start_key() - start a s390 channel program with key
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @key: storage key to be used for the I/O
* @flags: additional flags; defines the action to be performed for I/O
* processing.
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags)
{
struct subchannel *sch;
int ret;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state == DEV_STATE_VERIFY) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
cdev->private->flags.fake_irb = FAKE_CMD_IRB;
cdev->private->intparm = intparm;
return 0;
} else
/* There's already a fake I/O around. */
return -EBUSY;
}
if (cdev->private->state != DEV_STATE_ONLINE ||
((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
!(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) ||
cdev->private->flags.doverify)
return -EBUSY;
ret = cio_set_options (sch, flags);
if (ret)
return ret;
/* Adjust requested path mask to exclude unusable paths. */
if (lpm) {
lpm &= sch->lpm;
if (lpm == 0)
return -EACCES;
}
ret = cio_start_key (sch, cpa, lpm, key);
switch (ret) {
case 0:
cdev->private->intparm = intparm;
break;
case -EACCES:
case -ENODEV:
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
break;
}
return ret;
}
/**
* ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @key: storage key to be used for the I/O
* @flags: additional flags; defines the action to be performed for I/O
* processing.
* @expires: timeout value in jiffies
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* This function notifies the device driver if the channel program has not
* completed during the time specified by @expires. If a timeout occurs, the
* channel program is terminated via xsch, hsch or csch, and the device's
* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags, int expires)
{
int ret;
if (!cdev)
return -ENODEV;
ccw_device_set_timeout(cdev, expires);
ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
if (ret != 0)
ccw_device_set_timeout(cdev, 0);
return ret;
}
/**
* ccw_device_start() - start a s390 channel program
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @flags: additional flags; defines the action to be performed for I/O
* processing.
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, unsigned long flags)
{
return ccw_device_start_key(cdev, cpa, intparm, lpm,
PAGE_DEFAULT_KEY, flags);
}
/**
* ccw_device_start_timeout() - start a s390 channel program with timeout
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
* @cdev's interrupt handler. Allows a device driver to associate
* the interrupt with a particular I/O request.
* @lpm: defines the channel path to be used for a specific I/O request. A
* value of 0 will make cio use the opm.
* @flags: additional flags; defines the action to be performed for I/O
* processing.
* @expires: timeout value in jiffies
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* This function notifies the device driver if the channel program has not
* completed during the time specified by @expires. If a timeout occurs, the
* channel program is terminated via xsch, hsch or csch, and the device's
* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
* -%EACCES, if no path specified in @lpm is operational;
* -%ENODEV, if the device is not operational.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm,
unsigned long flags, int expires)
{
return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
PAGE_DEFAULT_KEY, flags,
expires);
}
/**
* ccw_device_halt() - halt I/O request processing
* @cdev: target ccw device
* @intparm: interruption parameter; value is only used if no I/O is
* outstanding, otherwise the intparm associated with the I/O request
* is returned
*
* ccw_device_halt() calls hsch on @cdev's subchannel.
* Returns:
* %0 on success,
* -%ENODEV on device not operational,
* -%EINVAL on invalid device state,
* -%EBUSY on device busy or interrupt pending.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
{
struct subchannel *sch;
int ret;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE &&
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
ret = cio_halt(sch);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
/**
* ccw_device_resume() - resume channel program execution
* @cdev: target ccw device
*
* ccw_device_resume() calls rsch on @cdev's subchannel.
* Returns:
* %0 on success,
* -%ENODEV on device not operational,
* -%EINVAL on invalid device state,
* -%EBUSY on device busy or interrupt pending.
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_resume(struct ccw_device *cdev)
{
struct subchannel *sch;
if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE ||
!(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
return -EINVAL;
return cio_resume(sch);
}
/*
* Pass interrupt to device driver.
*/
int
ccw_device_call_handler(struct ccw_device *cdev)
{
unsigned int stctl;
int ending_status;
/*
* we allow for the device action handler if .
* - we received ending status
* - the action handler requested to see all interrupts
* - we received an intermediate status
* - fast notification was requested (primary status)
* - unsolicited interrupts
*/
stctl = scsw_stctl(&cdev->private->irb.scsw);
ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
(stctl == SCSW_STCTL_STATUS_PEND);
if (!ending_status &&
!cdev->private->options.repall &&
!(stctl & SCSW_STCTL_INTER_STATUS) &&
!(cdev->private->options.fast &&
(stctl & SCSW_STCTL_PRIM_STATUS)))
return 0;
/* Clear pending timers for device driver initiated I/O. */
if (ending_status)
ccw_device_set_timeout(cdev, 0);
/*
* Now we are ready to call the device driver interrupt handler.
*/
if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,
&cdev->private->irb);
/*
* Clear the old and now useless interrupt response block.
*/
memset(&cdev->private->irb, 0, sizeof(struct irb));
return 1;
}
/**
* ccw_device_get_ciw() - Search for CIW command in extended sense data.
* @cdev: ccw device to inspect
* @ct: command type to look for
*
* During SenseID, command information words (CIWs) describing special
* commands available to the device may have been stored in the extended
* sense data. This function searches for CIWs of a specified command
* type in the extended sense data.
* Returns:
* %NULL if no extended sense data has been stored or if no CIW of the
* specified command type could be found,
* else a pointer to the CIW of the specified command type.
*/
struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
{
int ciw_cnt;
if (cdev->private->flags.esid == 0)
return NULL;
for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
return cdev->private->senseid.ciw + ciw_cnt;
return NULL;
}
/**
* ccw_device_get_path_mask() - get currently available paths
* @cdev: ccw device to be queried
* Returns:
* %0 if no subchannel for the device is available,
* else the mask of currently available paths for the ccw device's subchannel.
*/
__u8 ccw_device_get_path_mask(struct ccw_device *cdev)
{
struct subchannel *sch;
if (!cdev->dev.parent)
return 0;
sch = to_subchannel(cdev->dev.parent);
return sch->lpm;
}
struct stlck_data {
struct completion done;
int rc;
};
void ccw_device_stlck_done(struct ccw_device *cdev, void *data, int rc)
{
struct stlck_data *sdata = data;
sdata->rc = rc;
complete(&sdata->done);
}
/*
* Perform unconditional reserve + release.
*/
int ccw_device_stlck(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct stlck_data data;
u8 *buffer;
int rc;
/* Check if steal lock operation is valid for this device. */
if (cdev->drv) {
if (!cdev->private->options.force)
return -EINVAL;
}
buffer = kzalloc(64, GFP_DMA | GFP_KERNEL);
if (!buffer)
return -ENOMEM;
init_completion(&data.done);
data.rc = -EIO;
spin_lock_irq(sch->lock);
rc = cio_enable_subchannel(sch, (u32) (addr_t) sch);
if (rc)
goto out_unlock;
/* Perform operation. */
cdev->private->state = DEV_STATE_STEAL_LOCK,
ccw_device_stlck_start(cdev, &data, &buffer[0], &buffer[32]);
spin_unlock_irq(sch->lock);
/* Wait for operation to finish. */
if (wait_for_completion_interruptible(&data.done)) {
/* Got a signal. */
spin_lock_irq(sch->lock);
ccw_request_cancel(cdev);
spin_unlock_irq(sch->lock);
wait_for_completion(&data.done);
}
rc = data.rc;
/* Check results. */
spin_lock_irq(sch->lock);
cio_disable_subchannel(sch);
cdev->private->state = DEV_STATE_BOXED;
out_unlock:
spin_unlock_irq(sch->lock);
kfree(buffer);
return rc;
}
void *ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
{
struct subchannel *sch;
struct chp_id chpid;
sch = to_subchannel(cdev->dev.parent);
chp_id_init(&chpid);
chpid.id = sch->schib.pmcw.chpid[chp_no];
return chp_get_chp_desc(chpid);
}
/**
* ccw_device_get_id - obtain a ccw device id
* @cdev: device to obtain the id for
* @dev_id: where to fill in the values
*/
void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id)
{
*dev_id = cdev->private->dev_id;
}
EXPORT_SYMBOL(ccw_device_get_id);
/**
* ccw_device_tm_start_key - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @key: storage key to use for storage access
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key)
{
struct subchannel *sch;
int rc;
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state == DEV_STATE_VERIFY) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
cdev->private->flags.fake_irb = FAKE_TM_IRB;
cdev->private->intparm = intparm;
return 0;
} else
/* There's already a fake I/O around. */
return -EBUSY;
}
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
/* Adjust requested path mask to exclude unusable paths. */
if (lpm) {
lpm &= sch->lpm;
if (lpm == 0)
return -EACCES;
}
rc = cio_tm_start_key(sch, tcw, lpm, key);
if (rc == 0)
cdev->private->intparm = intparm;
return rc;
}
EXPORT_SYMBOL(ccw_device_tm_start_key);
/**
* ccw_device_tm_start_timeout_key - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @key: storage key to use for storage access
* @expires: time span in jiffies after which to abort request
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key,
int expires)
{
int ret;
ccw_device_set_timeout(cdev, expires);
ret = ccw_device_tm_start_key(cdev, tcw, intparm, lpm, key);
if (ret != 0)
ccw_device_set_timeout(cdev, 0);
return ret;
}
EXPORT_SYMBOL(ccw_device_tm_start_timeout_key);
/**
* ccw_device_tm_start - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm)
{
return ccw_device_tm_start_key(cdev, tcw, intparm, lpm,
PAGE_DEFAULT_KEY);
}
EXPORT_SYMBOL(ccw_device_tm_start);
/**
* ccw_device_tm_start_timeout - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @expires: time span in jiffies after which to abort request
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, int expires)
{
return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm,
PAGE_DEFAULT_KEY, expires);
}
EXPORT_SYMBOL(ccw_device_tm_start_timeout);
/**
* ccw_device_get_mdc - accumulate max data count
* @cdev: ccw device for which the max data count is accumulated
* @mask: mask of paths to use
*
* Return the number of 64K-bytes blocks all paths at least support
* for a transport command. Return values <= 0 indicate failures.
*/
int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct channel_path_desc_fmt1 desc;
struct chp_id chpid;
int mdc = 0, ret, i;
/* Adjust requested path mask to excluded varied off paths. */
if (mask)
mask &= sch->lpm;
else
mask = sch->lpm;
chp_id_init(&chpid);
for (i = 0; i < 8; i++) {
if (!(mask & (0x80 >> i)))
continue;
chpid.id = sch->schib.pmcw.chpid[i];
ret = chsc_determine_fmt1_channel_path_desc(chpid, &desc);
if (ret)
return ret;
if (!desc.f)
return 0;
if (!desc.r)
mdc = 1;
mdc = mdc ? min(mdc, (int)desc.mdc) : desc.mdc;
}
return mdc;
}
EXPORT_SYMBOL(ccw_device_get_mdc);
/**
* ccw_device_tm_intrg - perform interrogate function
* @cdev: ccw device on which to perform the interrogate function
*
* Perform an interrogate function on the given ccw device. Return zero on
* success, non-zero otherwise.
*/
int ccw_device_tm_intrg(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
if (!scsw_is_tm(&sch->schib.scsw) ||
!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND))
return -EINVAL;
return cio_tm_intrg(sch);
}
EXPORT_SYMBOL(ccw_device_tm_intrg);
// FIXME: these have to go:
int
_ccw_device_get_subchannel_number(struct ccw_device *cdev)
{
return cdev->private->schid.sch_no;
}
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_options_mask);
EXPORT_SYMBOL(ccw_device_set_options);
EXPORT_SYMBOL(ccw_device_clear_options);
EXPORT_SYMBOL(ccw_device_clear);
EXPORT_SYMBOL(ccw_device_halt);
EXPORT_SYMBOL(ccw_device_resume);
EXPORT_SYMBOL(ccw_device_start_timeout);
EXPORT_SYMBOL(ccw_device_start);
EXPORT_SYMBOL(ccw_device_start_timeout_key);
EXPORT_SYMBOL(ccw_device_start_key);
EXPORT_SYMBOL(ccw_device_get_ciw);
EXPORT_SYMBOL(ccw_device_get_path_mask);
EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);