blob: 93a897eebfff769c4aaddac3738d9c363291d03d [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 "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc.h"
#include "device.h"
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))
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_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_WAIT4IO &&
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_WAIT4IO &&
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;
/*
* 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;
}
static void
ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
{
if (!ip)
/* unsolicited interrupt */
return;
/* Abuse intparm for error reporting. */
if (IS_ERR(irb))
cdev->private->intparm = -EIO;
else if (irb->scsw.cc == 1)
/* Retry for deferred condition code. */
cdev->private->intparm = -EAGAIN;
else if ((irb->scsw.dstat !=
(DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
(irb->scsw.cstat != 0)) {
/*
* We didn't get channel end / device end. Check if path
* verification has been started; we can retry after it has
* finished. We also retry unit checks except for command reject
* or intervention required. Also check for long busy
* conditions.
*/
if (cdev->private->flags.doverify ||
cdev->private->state == DEV_STATE_VERIFY)
cdev->private->intparm = -EAGAIN;
if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
!(irb->ecw[0] &
(SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
cdev->private->intparm = -EAGAIN;
else if ((irb->scsw.dstat & DEV_STAT_ATTENTION) &&
(irb->scsw.dstat & DEV_STAT_DEV_END) &&
(irb->scsw.dstat & DEV_STAT_UNIT_EXCEP))
cdev->private->intparm = -EAGAIN;
else
cdev->private->intparm = -EIO;
} else
cdev->private->intparm = 0;
wake_up(&cdev->private->wait_q);
}
static inline int
__ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm)
{
int ret;
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
do {
ret = cio_start (sch, ccw, lpm);
if (ret == -EBUSY) {
/* Try again later. */
spin_unlock_irq(&sch->lock);
msleep(10);
spin_lock_irq(&sch->lock);
continue;
}
if (ret != 0)
/* Non-retryable error. */
break;
/* Wait for end of request. */
cdev->private->intparm = magic;
spin_unlock_irq(&sch->lock);
wait_event(cdev->private->wait_q,
(cdev->private->intparm == -EIO) ||
(cdev->private->intparm == -EAGAIN) ||
(cdev->private->intparm == 0));
spin_lock_irq(&sch->lock);
/* Check at least for channel end / device end */
if (cdev->private->intparm == -EIO) {
/* Non-retryable error. */
ret = -EIO;
break;
}
if (cdev->private->intparm == 0)
/* Success. */
break;
/* Try again later. */
spin_unlock_irq(&sch->lock);
msleep(10);
spin_lock_irq(&sch->lock);
} while (1);
return ret;
}
/**
* read_dev_chars() - read device characteristics
* @param cdev target ccw device
* @param buffer pointer to buffer for rdc data
* @param length size of rdc data
* @returns 0 for success, negative error value on failure
*
* Context:
* called for online device, lock not held
**/
int
read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
{
void (*handler)(struct ccw_device *, unsigned long, struct irb *);
struct subchannel *sch;
int ret;
struct ccw1 *rdc_ccw;
if (!cdev)
return -ENODEV;
if (!buffer || !length)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
CIO_TRACE_EVENT (4, "rddevch");
CIO_TRACE_EVENT (4, sch->dev.bus_id);
rdc_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
if (!rdc_ccw)
return -ENOMEM;
rdc_ccw->cmd_code = CCW_CMD_RDC;
rdc_ccw->count = length;
rdc_ccw->flags = CCW_FLAG_SLI;
ret = set_normalized_cda (rdc_ccw, (*buffer));
if (ret != 0) {
kfree(rdc_ccw);
return ret;
}
spin_lock_irq(&sch->lock);
/* Save interrupt handler. */
handler = cdev->handler;
/* Temporarily install own handler. */
cdev->handler = ccw_device_wake_up;
if (cdev->private->state != DEV_STATE_ONLINE)
ret = -ENODEV;
else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
!(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
cdev->private->flags.doverify)
ret = -EBUSY;
else
/* 0x00D9C4C3 == ebcdic "RDC" */
ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0);
/* Restore interrupt handler. */
cdev->handler = handler;
spin_unlock_irq(&sch->lock);
clear_normalized_cda (rdc_ccw);
kfree(rdc_ccw);
return ret;
}
/*
* Read Configuration data using path mask
*/
int
read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lpm)
{
void (*handler)(struct ccw_device *, unsigned long, struct irb *);
struct subchannel *sch;
struct ciw *ciw;
char *rcd_buf;
int ret;
struct ccw1 *rcd_ccw;
if (!cdev)
return -ENODEV;
if (!buffer || !length)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
CIO_TRACE_EVENT (4, "rdconf");
CIO_TRACE_EVENT (4, sch->dev.bus_id);
/*
* scan for RCD command in extended SenseID data
*/
ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD);
if (!ciw || ciw->cmd == 0)
return -EOPNOTSUPP;
/* Adjust requested path mask to excluded varied off paths. */
if (lpm) {
lpm &= sch->opm;
if (lpm == 0)
return -EACCES;
}
rcd_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
if (!rcd_ccw)
return -ENOMEM;
rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
if (!rcd_buf) {
kfree(rcd_ccw);
return -ENOMEM;
}
rcd_ccw->cmd_code = ciw->cmd;
rcd_ccw->cda = (__u32) __pa (rcd_buf);
rcd_ccw->count = ciw->count;
rcd_ccw->flags = CCW_FLAG_SLI;
spin_lock_irq(&sch->lock);
/* Save interrupt handler. */
handler = cdev->handler;
/* Temporarily install own handler. */
cdev->handler = ccw_device_wake_up;
if (cdev->private->state != DEV_STATE_ONLINE)
ret = -ENODEV;
else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
!(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
cdev->private->flags.doverify)
ret = -EBUSY;
else
/* 0x00D9C3C4 == ebcdic "RCD" */
ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm);
/* Restore interrupt handler. */
cdev->handler = handler;
spin_unlock_irq(&sch->lock);
/*
* on success we update the user input parms
*/
if (ret) {
kfree (rcd_buf);
*buffer = NULL;
*length = 0;
} else {
*length = ciw->count;
*buffer = rcd_buf;
}
kfree(rcd_ccw);
return ret;
}
/*
* Read Configuration data
*/
int
read_conf_data (struct ccw_device *cdev, void **buffer, int *length)
{
return read_conf_data_lpm (cdev, buffer, length, 0);
}
/*
* 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;
sch = to_subchannel(cdev->dev.parent);
return chsc_get_chp_desc(sch, chp_no);
}
// FIXME: these have to go:
int
_ccw_device_get_subchannel_number(struct ccw_device *cdev)
{
return cdev->private->sch_no;
}
int
_ccw_device_get_device_number(struct ccw_device *cdev)
{
return cdev->private->devno;
}
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(ccw_device_set_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(read_conf_data);
EXPORT_SYMBOL(read_dev_chars);
EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
EXPORT_SYMBOL(_ccw_device_get_device_number);
EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
EXPORT_SYMBOL_GPL(read_conf_data_lpm);