588 lines
18 KiB
C
588 lines
18 KiB
C
/*
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* drivers/s390/cio/device_ops.c
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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 (cornelia.huck@de.ibm.com)
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*/
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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/chpid.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 "chp.h"
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/**
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* ccw_device_set_options_mask() - set some options and unset the rest
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* @cdev: device for which the options are to be set
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* @flags: options to be set
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*
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* All flags specified in @flags are set, all flags not specified in @flags
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* are cleared.
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* Returns:
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* %0 on success, -%EINVAL on an invalid flag combination.
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*/
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int ccw_device_set_options_mask(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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/**
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* ccw_device_set_options() - set some options
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* @cdev: device for which the options are to be set
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* @flags: options to be set
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*
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* All flags specified in @flags are set, the remainder is left untouched.
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* Returns:
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* %0 on success, -%EINVAL if an invalid flag combination would ensue.
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*/
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int 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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((flags & CCWDEV_EARLY_NOTIFICATION) &&
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cdev->private->options.repall) ||
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((flags & CCWDEV_REPORT_ALL) &&
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cdev->private->options.fast))
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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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/**
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* ccw_device_clear_options() - clear some options
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* @cdev: device for which the options are to be cleared
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* @flags: options to be cleared
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*
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* All flags specified in @flags are cleared, the remainder is left untouched.
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*/
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void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
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{
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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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}
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/**
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* ccw_device_clear() - terminate I/O request processing
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* @cdev: target ccw device
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* @intparm: interruption parameter; value is only used if no I/O is
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* outstanding, otherwise the intparm associated with the I/O request
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* is returned
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*
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* ccw_device_clear() calls csch on @cdev's subchannel.
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* Returns:
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* %0 on success,
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* -%ENODEV on device not operational,
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* -%EINVAL on invalid device state.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int 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_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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/**
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* ccw_device_start_key() - start a s390 channel program with key
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* @cdev: target ccw device
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* @cpa: logical start address of channel program
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* @intparm: user specific interruption parameter; will be presented back to
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* @cdev's interrupt handler. Allows a device driver to associate
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* the interrupt with a particular I/O request.
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* @lpm: defines the channel path to be used for a specific I/O request. A
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* value of 0 will make cio use the opm.
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* @key: storage key to be used for the I/O
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* @flags: additional flags; defines the action to be performed for I/O
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* processing.
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*
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* Start a S/390 channel program. When the interrupt arrives, the
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* IRQ handler is called, either immediately, delayed (dev-end missing,
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* or sense required) or never (no IRQ handler registered).
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* Returns:
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* %0, if the operation was successful;
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* -%EBUSY, if the device is busy, or status pending;
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* -%EACCES, if no path specified in @lpm is operational;
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* -%ENODEV, if the device is not operational.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int 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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cdev->private->state == DEV_STATE_CLEAR_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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/* Adjust requested path mask to excluded varied off paths. */
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if (lpm) {
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lpm &= sch->opm;
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if (lpm == 0)
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return -EACCES;
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}
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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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/**
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* ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
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* @cdev: target ccw device
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* @cpa: logical start address of channel program
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* @intparm: user specific interruption parameter; will be presented back to
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* @cdev's interrupt handler. Allows a device driver to associate
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* the interrupt with a particular I/O request.
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* @lpm: defines the channel path to be used for a specific I/O request. A
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* value of 0 will make cio use the opm.
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* @key: storage key to be used for the I/O
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* @flags: additional flags; defines the action to be performed for I/O
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* processing.
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* @expires: timeout value in jiffies
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*
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* Start a S/390 channel program. When the interrupt arrives, the
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* IRQ handler is called, either immediately, delayed (dev-end missing,
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* or sense required) or never (no IRQ handler registered).
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* This function notifies the device driver if the channel program has not
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* completed during the time specified by @expires. If a timeout occurs, the
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* channel program is terminated via xsch, hsch or csch, and the device's
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* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
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* Returns:
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* %0, if the operation was successful;
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* -%EBUSY, if the device is busy, or status pending;
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* -%EACCES, if no path specified in @lpm is operational;
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* -%ENODEV, if the device is not operational.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int 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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/**
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* ccw_device_start() - start a s390 channel program
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* @cdev: target ccw device
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* @cpa: logical start address of channel program
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* @intparm: user specific interruption parameter; will be presented back to
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* @cdev's interrupt handler. Allows a device driver to associate
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* the interrupt with a particular I/O request.
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* @lpm: defines the channel path to be used for a specific I/O request. A
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* value of 0 will make cio use the opm.
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* @flags: additional flags; defines the action to be performed for I/O
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* processing.
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*
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* Start a S/390 channel program. When the interrupt arrives, the
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* IRQ handler is called, either immediately, delayed (dev-end missing,
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* or sense required) or never (no IRQ handler registered).
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* Returns:
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* %0, if the operation was successful;
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* -%EBUSY, if the device is busy, or status pending;
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* -%EACCES, if no path specified in @lpm is operational;
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* -%ENODEV, if the device is not operational.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int 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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PAGE_DEFAULT_KEY, flags);
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}
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/**
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* ccw_device_start_timeout() - start a s390 channel program with timeout
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* @cdev: target ccw device
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* @cpa: logical start address of channel program
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* @intparm: user specific interruption parameter; will be presented back to
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* @cdev's interrupt handler. Allows a device driver to associate
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* the interrupt with a particular I/O request.
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* @lpm: defines the channel path to be used for a specific I/O request. A
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* value of 0 will make cio use the opm.
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* @flags: additional flags; defines the action to be performed for I/O
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* processing.
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* @expires: timeout value in jiffies
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*
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* Start a S/390 channel program. When the interrupt arrives, the
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* IRQ handler is called, either immediately, delayed (dev-end missing,
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* or sense required) or never (no IRQ handler registered).
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* This function notifies the device driver if the channel program has not
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* completed during the time specified by @expires. If a timeout occurs, the
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* channel program is terminated via xsch, hsch or csch, and the device's
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* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
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* Returns:
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* %0, if the operation was successful;
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* -%EBUSY, if the device is busy, or status pending;
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* -%EACCES, if no path specified in @lpm is operational;
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* -%ENODEV, if the device is not operational.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
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unsigned long intparm, __u8 lpm,
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unsigned long flags, int expires)
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{
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return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
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PAGE_DEFAULT_KEY, flags,
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expires);
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}
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/**
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* ccw_device_halt() - halt I/O request processing
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* @cdev: target ccw device
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* @intparm: interruption parameter; value is only used if no I/O is
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* outstanding, otherwise the intparm associated with the I/O request
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* is returned
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*
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* ccw_device_halt() calls hsch on @cdev's subchannel.
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* Returns:
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* %0 on success,
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* -%ENODEV on device not operational,
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* -%EINVAL on invalid device state,
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* -%EBUSY on device busy or interrupt pending.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int 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_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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/**
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* ccw_device_resume() - resume channel program execution
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* @cdev: target ccw device
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*
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* ccw_device_resume() calls rsch on @cdev's subchannel.
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* Returns:
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* %0 on success,
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* -%ENODEV on device not operational,
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* -%EINVAL on invalid device state,
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* -%EBUSY on device busy or interrupt pending.
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* Context:
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* Interrupts disabled, ccw device lock held
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*/
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int 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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/* Clear pending timers for device driver initiated I/O. */
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if (ending_status)
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ccw_device_set_timeout(cdev, 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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* ccw_device_get_ciw() - Search for CIW command in extended sense data.
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* @cdev: ccw device to inspect
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* @ct: command type to look for
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*
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* During SenseID, command information words (CIWs) describing special
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* commands available to the device may have been stored in the extended
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* sense data. This function searches for CIWs of a specified command
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* type in the extended sense data.
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* Returns:
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* %NULL if no extended sense data has been stored or if no CIW of the
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* specified command type could be found,
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* else a pointer to the CIW of the specified command type.
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*/
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struct ciw *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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/**
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* ccw_device_get_path_mask() - get currently available paths
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* @cdev: ccw device to be queried
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* Returns:
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* %0 if no subchannel for the device is available,
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* else the mask of currently available paths for the ccw device's subchannel.
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*/
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__u8 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->lpm;
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}
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/*
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* 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);
|