Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
603
drivers/s390/cio/device_ops.c
Normal file
603
drivers/s390/cio/device_ops.c
Normal file
@ -0,0 +1,603 @@
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/*
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* drivers/s390/cio/device_ops.c
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*
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* $Revision: 1.55 $
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Cornelia Huck (cohuck@de.ibm.com)
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <asm/ccwdev.h>
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#include <asm/idals.h>
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#include <asm/qdio.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "chsc.h"
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#include "device.h"
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#include "qdio.h"
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int
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ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
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{
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/*
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* The flag usage is mutal exclusive ...
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*/
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if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
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(flags & CCWDEV_REPORT_ALL))
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return -EINVAL;
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cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
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cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
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cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
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cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
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return 0;
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}
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int
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ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
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{
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struct subchannel *sch;
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int ret;
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if (!cdev)
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return -ENODEV;
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if (cdev->private->state == DEV_STATE_NOT_OPER)
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return -ENODEV;
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if (cdev->private->state != DEV_STATE_ONLINE &&
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cdev->private->state != DEV_STATE_WAIT4IO &&
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cdev->private->state != DEV_STATE_W4SENSE)
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return -EINVAL;
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sch = to_subchannel(cdev->dev.parent);
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if (!sch)
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return -ENODEV;
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ret = cio_clear(sch);
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if (ret == 0)
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cdev->private->intparm = intparm;
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return ret;
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}
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int
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ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
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unsigned long intparm, __u8 lpm, __u8 key,
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unsigned long flags)
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{
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struct subchannel *sch;
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int ret;
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if (!cdev)
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return -ENODEV;
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sch = to_subchannel(cdev->dev.parent);
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if (!sch)
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return -ENODEV;
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if (cdev->private->state == DEV_STATE_NOT_OPER)
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return -ENODEV;
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if (cdev->private->state == DEV_STATE_VERIFY) {
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/* Remember to fake irb when finished. */
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if (!cdev->private->flags.fake_irb) {
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cdev->private->flags.fake_irb = 1;
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cdev->private->intparm = intparm;
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return 0;
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} else
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/* There's already a fake I/O around. */
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return -EBUSY;
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}
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if (cdev->private->state != DEV_STATE_ONLINE ||
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((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
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!(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
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cdev->private->flags.doverify)
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return -EBUSY;
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ret = cio_set_options (sch, flags);
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if (ret)
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return ret;
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ret = cio_start_key (sch, cpa, lpm, key);
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if (ret == 0)
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cdev->private->intparm = intparm;
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return ret;
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}
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int
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ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
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unsigned long intparm, __u8 lpm, __u8 key,
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unsigned long flags, int expires)
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{
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int ret;
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if (!cdev)
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return -ENODEV;
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ccw_device_set_timeout(cdev, expires);
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ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
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if (ret != 0)
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ccw_device_set_timeout(cdev, 0);
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return ret;
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}
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int
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ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
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unsigned long intparm, __u8 lpm, unsigned long flags)
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{
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return ccw_device_start_key(cdev, cpa, intparm, lpm,
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default_storage_key, flags);
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}
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int
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ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
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unsigned long intparm, __u8 lpm, unsigned long flags,
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int expires)
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{
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return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
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default_storage_key, flags,
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expires);
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}
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int
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ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
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{
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struct subchannel *sch;
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int ret;
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if (!cdev)
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return -ENODEV;
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if (cdev->private->state == DEV_STATE_NOT_OPER)
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return -ENODEV;
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if (cdev->private->state != DEV_STATE_ONLINE &&
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cdev->private->state != DEV_STATE_WAIT4IO &&
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cdev->private->state != DEV_STATE_W4SENSE)
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return -EINVAL;
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sch = to_subchannel(cdev->dev.parent);
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if (!sch)
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return -ENODEV;
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ret = cio_halt(sch);
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if (ret == 0)
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cdev->private->intparm = intparm;
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return ret;
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}
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int
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ccw_device_resume(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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if (!cdev)
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return -ENODEV;
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sch = to_subchannel(cdev->dev.parent);
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if (!sch)
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return -ENODEV;
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if (cdev->private->state == DEV_STATE_NOT_OPER)
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return -ENODEV;
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if (cdev->private->state != DEV_STATE_ONLINE ||
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!(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
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return -EINVAL;
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return cio_resume(sch);
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}
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/*
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* Pass interrupt to device driver.
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*/
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int
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ccw_device_call_handler(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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unsigned int stctl;
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int ending_status;
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sch = to_subchannel(cdev->dev.parent);
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/*
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* we allow for the device action handler if .
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* - we received ending status
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* - the action handler requested to see all interrupts
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* - we received an intermediate status
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* - fast notification was requested (primary status)
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* - unsolicited interrupts
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*/
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stctl = cdev->private->irb.scsw.stctl;
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ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
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(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
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(stctl == SCSW_STCTL_STATUS_PEND);
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if (!ending_status &&
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!cdev->private->options.repall &&
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!(stctl & SCSW_STCTL_INTER_STATUS) &&
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!(cdev->private->options.fast &&
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(stctl & SCSW_STCTL_PRIM_STATUS)))
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return 0;
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/*
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* Now we are ready to call the device driver interrupt handler.
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*/
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if (cdev->handler)
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cdev->handler(cdev, cdev->private->intparm,
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&cdev->private->irb);
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/*
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* Clear the old and now useless interrupt response block.
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*/
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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return 1;
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}
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/*
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* Search for CIW command in extended sense data.
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*/
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struct ciw *
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ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
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{
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int ciw_cnt;
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if (cdev->private->flags.esid == 0)
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return NULL;
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for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
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if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
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return cdev->private->senseid.ciw + ciw_cnt;
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return NULL;
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}
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__u8
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ccw_device_get_path_mask(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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if (!sch)
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return 0;
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else
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return sch->vpm;
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}
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static void
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ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
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{
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if (!ip)
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/* unsolicited interrupt */
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return;
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/* Abuse intparm for error reporting. */
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if (IS_ERR(irb))
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cdev->private->intparm = -EIO;
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else if ((irb->scsw.dstat !=
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(DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
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(irb->scsw.cstat != 0)) {
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/*
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* We didn't get channel end / device end. Check if path
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* verification has been started; we can retry after it has
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* finished. We also retry unit checks except for command reject
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* or intervention required.
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*/
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if (cdev->private->flags.doverify ||
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cdev->private->state == DEV_STATE_VERIFY)
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cdev->private->intparm = -EAGAIN;
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if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
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!(irb->ecw[0] &
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(SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
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cdev->private->intparm = -EAGAIN;
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else
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cdev->private->intparm = -EIO;
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} else
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cdev->private->intparm = 0;
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wake_up(&cdev->private->wait_q);
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}
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static inline int
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__ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm)
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{
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int ret;
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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do {
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ret = cio_start (sch, ccw, lpm);
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if ((ret == -EBUSY) || (ret == -EACCES)) {
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/* Try again later. */
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spin_unlock_irq(&sch->lock);
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msleep(10);
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spin_lock_irq(&sch->lock);
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continue;
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}
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if (ret != 0)
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/* Non-retryable error. */
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break;
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/* Wait for end of request. */
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cdev->private->intparm = magic;
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spin_unlock_irq(&sch->lock);
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wait_event(cdev->private->wait_q,
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(cdev->private->intparm == -EIO) ||
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(cdev->private->intparm == -EAGAIN) ||
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(cdev->private->intparm == 0));
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spin_lock_irq(&sch->lock);
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/* Check at least for channel end / device end */
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if (cdev->private->intparm == -EIO) {
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||||
/* Non-retryable error. */
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||||
ret = -EIO;
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||||
break;
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||||
}
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||||
if (cdev->private->intparm == 0)
|
||||
/* Success. */
|
||||
break;
|
||||
/* Try again later. */
|
||||
spin_unlock_irq(&sch->lock);
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||||
msleep(10);
|
||||
spin_lock_irq(&sch->lock);
|
||||
} while (1);
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||||
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||||
return ret;
|
||||
}
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||||
|
||||
/**
|
||||
* 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
|
||||
**/
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||||
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)
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||||
return -EINVAL;
|
||||
sch = to_subchannel(cdev->dev.parent);
|
||||
|
||||
CIO_TRACE_EVENT (4, "rddevch");
|
||||
CIO_TRACE_EVENT (4, sch->dev.bus_id);
|
||||
|
||||
rdc_ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
|
||||
if (!rdc_ccw)
|
||||
return -ENOMEM;
|
||||
memset(rdc_ccw, 0, sizeof(struct ccw1));
|
||||
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;
|
||||
|
||||
rcd_ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
|
||||
if (!rcd_ccw)
|
||||
return -ENOMEM;
|
||||
memset(rcd_ccw, 0, sizeof(struct ccw1));
|
||||
rcd_buf = kmalloc(ciw->count, GFP_KERNEL | GFP_DMA);
|
||||
if (!rcd_buf) {
|
||||
kfree(rcd_ccw);
|
||||
return -ENOMEM;
|
||||
}
|
||||
memset (rcd_buf, 0, ciw->count);
|
||||
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:
|
||||
if (buf)
|
||||
kfree(buf);
|
||||
if (buf2)
|
||||
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->irq;
|
||||
}
|
||||
|
||||
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);
|
||||
Reference in New Issue
Block a user