blob: 14eba854b1556e8bad206828105ea8c5974aeb24 [file] [log] [blame]
/*
* drivers/s390/cio/device_ops.c
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* 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 <asm/ccwdev.h>
#include <asm/idals.h>
#include <asm/chpid.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc.h"
#include "device.h"
#include "chp.h"
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;
return 0;
}
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;
return 0;
}
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;
}
int
ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
{
struct subchannel *sch;
int ret;
if (!cdev)
return -ENODEV;
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;
sch = to_subchannel(cdev->dev.parent);
if (!sch)
return -ENODEV;
ret = cio_clear(sch);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
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)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch)
return -ENODEV;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state == DEV_STATE_VERIFY ||
cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
cdev->private->flags.fake_irb = 1;
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.stctl & SCSW_STCTL_PRIM_STATUS) &&
!(sch->schib.scsw.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 excluded varied off paths. */
if (lpm) {
lpm &= sch->opm;
if (lpm == 0)
return -EACCES;
}
ret = cio_start_key (sch, cpa, lpm, key);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
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;
}
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);
}
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);
}
int
ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
{
struct subchannel *sch;
int ret;
if (!cdev)
return -ENODEV;
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;
sch = to_subchannel(cdev->dev.parent);
if (!sch)
return -ENODEV;
ret = cio_halt(sch);
if (ret == 0)
cdev->private->intparm = intparm;
return ret;
}
int
ccw_device_resume(struct ccw_device *cdev)
{
struct subchannel *sch;
if (!cdev)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
if (!sch)
return -ENODEV;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE ||
!(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
return -EINVAL;
return cio_resume(sch);
}
/*
* Pass interrupt to device driver.
*/
int
ccw_device_call_handler(struct ccw_device *cdev)
{
struct subchannel *sch;
unsigned int stctl;
int ending_status;
sch = to_subchannel(cdev->dev.parent);
/*
* 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 = cdev->private->irb.scsw.stctl;
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;
}
/*
* Search for CIW command in extended sense data.
*/
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;
}
__u8
ccw_device_get_path_mask(struct ccw_device *cdev)
{
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
if (!sch)
return 0;
else
return sch->lpm;
}
/*
* Try to break the lock on a boxed device.
*/
int
ccw_device_stlck(struct ccw_device *cdev)
{
void *buf, *buf2;
unsigned long flags;
struct subchannel *sch;
int ret;
if (!cdev)
return -ENODEV;
if (cdev->drv && !cdev->private->options.force)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
CIO_TRACE_EVENT(2, "stl lock");
CIO_TRACE_EVENT(2, cdev->dev.bus_id);
buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
if (!buf2) {
kfree(buf);
return -ENOMEM;
}
spin_lock_irqsave(sch->lock, flags);
ret = cio_enable_subchannel(sch, 3);
if (ret)
goto out_unlock;
/*
* Setup ccw. We chain an unconditional reserve and a release so we
* only break the lock.
*/
cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
cdev->private->iccws[0].cda = (__u32) __pa(buf);
cdev->private->iccws[0].count = 32;
cdev->private->iccws[0].flags = CCW_FLAG_CC;
cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
cdev->private->iccws[1].cda = (__u32) __pa(buf2);
cdev->private->iccws[1].count = 32;
cdev->private->iccws[1].flags = 0;
ret = cio_start(sch, cdev->private->iccws, 0);
if (ret) {
cio_disable_subchannel(sch); //FIXME: return code?
goto out_unlock;
}
cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND;
spin_unlock_irqrestore(sch->lock, flags);
wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
spin_lock_irqsave(sch->lock, flags);
cio_disable_subchannel(sch); //FIXME: return code?
if ((cdev->private->irb.scsw.dstat !=
(DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
(cdev->private->irb.scsw.cstat != 0))
ret = -EIO;
/* Clear irb. */
memset(&cdev->private->irb, 0, sizeof(struct irb));
out_unlock:
kfree(buf);
kfree(buf2);
spin_unlock_irqrestore(sch->lock, flags);
return ret;
}
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);
// 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);