23d805b647
Extend the scsw data structure to the format required by fcx. Also provide helper functions for easier access to fields which are present in both the traditional as well as the modified format. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
596 lines
18 KiB
C
596 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.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
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!(sch->schib.scsw.cmd.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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switch (ret) {
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case 0:
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cdev->private->intparm = intparm;
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break;
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case -EACCES:
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case -ENODEV:
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dev_fsm_event(cdev, DEV_EVENT_VERIFY);
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break;
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}
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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.cmd.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 = scsw_stctl(&cdev->private->irb.scsw);
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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
|
|
* Returns:
|
|
* %0 if no subchannel for the device is available,
|
|
* else the mask of currently available paths for the ccw device's subchannel.
|
|
*/
|
|
__u8 ccw_device_get_path_mask(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
|
|
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, (u32)(addr_t)sch);
|
|
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.cmd.actl |= SCSW_ACTL_START_PEND;
|
|
spin_unlock_irqrestore(sch->lock, flags);
|
|
wait_event(cdev->private->wait_q,
|
|
cdev->private->irb.scsw.cmd.actl == 0);
|
|
spin_lock_irqsave(sch->lock, flags);
|
|
cio_disable_subchannel(sch); //FIXME: return code?
|
|
if ((cdev->private->irb.scsw.cmd.dstat !=
|
|
(DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
|
|
(cdev->private->irb.scsw.cmd.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);
|