/* * Copyright IBM Corp. 2002, 2009 * * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) */ #include #include #include #include #include #include #include #include #include #include #include #include #include "cio.h" #include "cio_debug.h" #include "css.h" #include "chsc.h" #include "device.h" #include "chp.h" /** * ccw_device_set_options_mask() - set some options and unset the rest * @cdev: device for which the options are to be set * @flags: options to be set * * All flags specified in @flags are set, all flags not specified in @flags * are cleared. * Returns: * %0 on success, -%EINVAL on an invalid flag combination. */ int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags) { /* * The flag usage is mutal exclusive ... */ if ((flags & CCWDEV_EARLY_NOTIFICATION) && (flags & CCWDEV_REPORT_ALL)) return -EINVAL; cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0; cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0; cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0; cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0; cdev->private->options.mpath = (flags & CCWDEV_DO_MULTIPATH) != 0; return 0; } /** * ccw_device_set_options() - set some options * @cdev: device for which the options are to be set * @flags: options to be set * * All flags specified in @flags are set, the remainder is left untouched. * Returns: * %0 on success, -%EINVAL if an invalid flag combination would ensue. */ int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) { /* * The flag usage is mutal exclusive ... */ if (((flags & CCWDEV_EARLY_NOTIFICATION) && (flags & CCWDEV_REPORT_ALL)) || ((flags & CCWDEV_EARLY_NOTIFICATION) && cdev->private->options.repall) || ((flags & CCWDEV_REPORT_ALL) && cdev->private->options.fast)) return -EINVAL; cdev->private->options.fast |= (flags & CCWDEV_EARLY_NOTIFICATION) != 0; cdev->private->options.repall |= (flags & CCWDEV_REPORT_ALL) != 0; cdev->private->options.pgroup |= (flags & CCWDEV_DO_PATHGROUP) != 0; cdev->private->options.force |= (flags & CCWDEV_ALLOW_FORCE) != 0; cdev->private->options.mpath |= (flags & CCWDEV_DO_MULTIPATH) != 0; return 0; } /** * ccw_device_clear_options() - clear some options * @cdev: device for which the options are to be cleared * @flags: options to be cleared * * All flags specified in @flags are cleared, the remainder is left untouched. */ void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags) { cdev->private->options.fast &= (flags & CCWDEV_EARLY_NOTIFICATION) == 0; cdev->private->options.repall &= (flags & CCWDEV_REPORT_ALL) == 0; cdev->private->options.pgroup &= (flags & CCWDEV_DO_PATHGROUP) == 0; cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0; cdev->private->options.mpath &= (flags & CCWDEV_DO_MULTIPATH) == 0; } /** * ccw_device_is_pathgroup - determine if paths to this device are grouped * @cdev: ccw device * * Return non-zero if there is a path group, zero otherwise. */ int ccw_device_is_pathgroup(struct ccw_device *cdev) { return cdev->private->flags.pgroup; } EXPORT_SYMBOL(ccw_device_is_pathgroup); /** * ccw_device_is_multipath - determine if device is operating in multipath mode * @cdev: ccw device * * Return non-zero if device is operating in multipath mode, zero otherwise. */ int ccw_device_is_multipath(struct ccw_device *cdev) { return cdev->private->flags.mpath; } EXPORT_SYMBOL(ccw_device_is_multipath); /** * ccw_device_clear() - terminate I/O request processing * @cdev: target ccw device * @intparm: interruption parameter; value is only used if no I/O is * outstanding, otherwise the intparm associated with the I/O request * is returned * * ccw_device_clear() calls csch on @cdev's subchannel. * Returns: * %0 on success, * -%ENODEV on device not operational, * -%EINVAL on invalid device state. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm) { struct subchannel *sch; int ret; if (!cdev || !cdev->dev.parent) return -ENODEV; sch = to_subchannel(cdev->dev.parent); if (!sch->schib.pmcw.ena) return -EINVAL; if (cdev->private->state == DEV_STATE_NOT_OPER) return -ENODEV; if (cdev->private->state != DEV_STATE_ONLINE && cdev->private->state != DEV_STATE_W4SENSE) return -EINVAL; ret = cio_clear(sch); if (ret == 0) cdev->private->intparm = intparm; return ret; } /** * ccw_device_start_key() - start a s390 channel program with key * @cdev: target ccw device * @cpa: logical start address of channel program * @intparm: user specific interruption parameter; will be presented back to * @cdev's interrupt handler. Allows a device driver to associate * the interrupt with a particular I/O request. * @lpm: defines the channel path to be used for a specific I/O request. A * value of 0 will make cio use the opm. * @key: storage key to be used for the I/O * @flags: additional flags; defines the action to be performed for I/O * processing. * * Start a S/390 channel program. When the interrupt arrives, the * IRQ handler is called, either immediately, delayed (dev-end missing, * or sense required) or never (no IRQ handler registered). * Returns: * %0, if the operation was successful; * -%EBUSY, if the device is busy, or status pending; * -%EACCES, if no path specified in @lpm is operational; * -%ENODEV, if the device is not operational. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa, unsigned long intparm, __u8 lpm, __u8 key, unsigned long flags) { struct subchannel *sch; int ret; if (!cdev || !cdev->dev.parent) return -ENODEV; sch = to_subchannel(cdev->dev.parent); if (!sch->schib.pmcw.ena) return -EINVAL; if (cdev->private->state == DEV_STATE_NOT_OPER) return -ENODEV; if (cdev->private->state == DEV_STATE_VERIFY) { /* Remember to fake irb when finished. */ if (!cdev->private->flags.fake_irb) { cdev->private->flags.fake_irb = 1; cdev->private->intparm = intparm; return 0; } else /* There's already a fake I/O around. */ return -EBUSY; } if (cdev->private->state != DEV_STATE_ONLINE || ((sch->schib.scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) && !(sch->schib.scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS)) || cdev->private->flags.doverify) return -EBUSY; ret = cio_set_options (sch, flags); if (ret) return ret; /* Adjust requested path mask to excluded varied off paths. */ if (lpm) { lpm &= sch->opm; if (lpm == 0) return -EACCES; } ret = cio_start_key (sch, cpa, lpm, key); switch (ret) { case 0: cdev->private->intparm = intparm; break; case -EACCES: case -ENODEV: dev_fsm_event(cdev, DEV_EVENT_VERIFY); break; } return ret; } /** * ccw_device_start_timeout_key() - start a s390 channel program with timeout and key * @cdev: target ccw device * @cpa: logical start address of channel program * @intparm: user specific interruption parameter; will be presented back to * @cdev's interrupt handler. Allows a device driver to associate * the interrupt with a particular I/O request. * @lpm: defines the channel path to be used for a specific I/O request. A * value of 0 will make cio use the opm. * @key: storage key to be used for the I/O * @flags: additional flags; defines the action to be performed for I/O * processing. * @expires: timeout value in jiffies * * Start a S/390 channel program. When the interrupt arrives, the * IRQ handler is called, either immediately, delayed (dev-end missing, * or sense required) or never (no IRQ handler registered). * This function notifies the device driver if the channel program has not * completed during the time specified by @expires. If a timeout occurs, the * channel program is terminated via xsch, hsch or csch, and the device's * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). * Returns: * %0, if the operation was successful; * -%EBUSY, if the device is busy, or status pending; * -%EACCES, if no path specified in @lpm is operational; * -%ENODEV, if the device is not operational. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa, unsigned long intparm, __u8 lpm, __u8 key, unsigned long flags, int expires) { int ret; if (!cdev) return -ENODEV; ccw_device_set_timeout(cdev, expires); ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags); if (ret != 0) ccw_device_set_timeout(cdev, 0); return ret; } /** * ccw_device_start() - start a s390 channel program * @cdev: target ccw device * @cpa: logical start address of channel program * @intparm: user specific interruption parameter; will be presented back to * @cdev's interrupt handler. Allows a device driver to associate * the interrupt with a particular I/O request. * @lpm: defines the channel path to be used for a specific I/O request. A * value of 0 will make cio use the opm. * @flags: additional flags; defines the action to be performed for I/O * processing. * * Start a S/390 channel program. When the interrupt arrives, the * IRQ handler is called, either immediately, delayed (dev-end missing, * or sense required) or never (no IRQ handler registered). * Returns: * %0, if the operation was successful; * -%EBUSY, if the device is busy, or status pending; * -%EACCES, if no path specified in @lpm is operational; * -%ENODEV, if the device is not operational. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa, unsigned long intparm, __u8 lpm, unsigned long flags) { return ccw_device_start_key(cdev, cpa, intparm, lpm, PAGE_DEFAULT_KEY, flags); } /** * ccw_device_start_timeout() - start a s390 channel program with timeout * @cdev: target ccw device * @cpa: logical start address of channel program * @intparm: user specific interruption parameter; will be presented back to * @cdev's interrupt handler. Allows a device driver to associate * the interrupt with a particular I/O request. * @lpm: defines the channel path to be used for a specific I/O request. A * value of 0 will make cio use the opm. * @flags: additional flags; defines the action to be performed for I/O * processing. * @expires: timeout value in jiffies * * Start a S/390 channel program. When the interrupt arrives, the * IRQ handler is called, either immediately, delayed (dev-end missing, * or sense required) or never (no IRQ handler registered). * This function notifies the device driver if the channel program has not * completed during the time specified by @expires. If a timeout occurs, the * channel program is terminated via xsch, hsch or csch, and the device's * interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT). * Returns: * %0, if the operation was successful; * -%EBUSY, if the device is busy, or status pending; * -%EACCES, if no path specified in @lpm is operational; * -%ENODEV, if the device is not operational. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa, unsigned long intparm, __u8 lpm, unsigned long flags, int expires) { return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, PAGE_DEFAULT_KEY, flags, expires); } /** * ccw_device_halt() - halt I/O request processing * @cdev: target ccw device * @intparm: interruption parameter; value is only used if no I/O is * outstanding, otherwise the intparm associated with the I/O request * is returned * * ccw_device_halt() calls hsch on @cdev's subchannel. * Returns: * %0 on success, * -%ENODEV on device not operational, * -%EINVAL on invalid device state, * -%EBUSY on device busy or interrupt pending. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm) { struct subchannel *sch; int ret; if (!cdev || !cdev->dev.parent) return -ENODEV; sch = to_subchannel(cdev->dev.parent); if (!sch->schib.pmcw.ena) return -EINVAL; if (cdev->private->state == DEV_STATE_NOT_OPER) return -ENODEV; if (cdev->private->state != DEV_STATE_ONLINE && cdev->private->state != DEV_STATE_W4SENSE) return -EINVAL; ret = cio_halt(sch); if (ret == 0) cdev->private->intparm = intparm; return ret; } /** * ccw_device_resume() - resume channel program execution * @cdev: target ccw device * * ccw_device_resume() calls rsch on @cdev's subchannel. * Returns: * %0 on success, * -%ENODEV on device not operational, * -%EINVAL on invalid device state, * -%EBUSY on device busy or interrupt pending. * Context: * Interrupts disabled, ccw device lock held */ int ccw_device_resume(struct ccw_device *cdev) { struct subchannel *sch; if (!cdev || !cdev->dev.parent) return -ENODEV; sch = to_subchannel(cdev->dev.parent); if (!sch->schib.pmcw.ena) return -EINVAL; if (cdev->private->state == DEV_STATE_NOT_OPER) return -ENODEV; if (cdev->private->state != DEV_STATE_ONLINE || !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) return -EINVAL; return cio_resume(sch); } /* * Pass interrupt to device driver. */ int ccw_device_call_handler(struct ccw_device *cdev) { struct subchannel *sch; unsigned int stctl; int ending_status; sch = to_subchannel(cdev->dev.parent); /* * we allow for the device action handler if . * - we received ending status * - the action handler requested to see all interrupts * - we received an intermediate status * - fast notification was requested (primary status) * - unsolicited interrupts */ stctl = scsw_stctl(&cdev->private->irb.scsw); ending_status = (stctl & SCSW_STCTL_SEC_STATUS) || (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) || (stctl == SCSW_STCTL_STATUS_PEND); if (!ending_status && !cdev->private->options.repall && !(stctl & SCSW_STCTL_INTER_STATUS) && !(cdev->private->options.fast && (stctl & SCSW_STCTL_PRIM_STATUS))) return 0; /* Clear pending timers for device driver initiated I/O. */ if (ending_status) ccw_device_set_timeout(cdev, 0); /* * Now we are ready to call the device driver interrupt handler. */ if (cdev->handler) cdev->handler(cdev, cdev->private->intparm, &cdev->private->irb); /* * Clear the old and now useless interrupt response block. */ memset(&cdev->private->irb, 0, sizeof(struct irb)); return 1; } /** * ccw_device_get_ciw() - Search for CIW command in extended sense data. * @cdev: ccw device to inspect * @ct: command type to look for * * During SenseID, command information words (CIWs) describing special * commands available to the device may have been stored in the extended * sense data. This function searches for CIWs of a specified command * type in the extended sense data. * Returns: * %NULL if no extended sense data has been stored or if no CIW of the * specified command type could be found, * else a pointer to the CIW of the specified command type. */ struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct) { int ciw_cnt; if (cdev->private->flags.esid == 0) return NULL; for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++) if (cdev->private->senseid.ciw[ciw_cnt].ct == ct) return cdev->private->senseid.ciw + ciw_cnt; return NULL; } /** * ccw_device_get_path_mask() - get currently available paths * @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; if (!cdev->dev.parent) return 0; sch = to_subchannel(cdev->dev.parent); return sch->lpm; } struct stlck_data { struct completion done; int rc; }; void ccw_device_stlck_done(struct ccw_device *cdev, void *data, int rc) { struct stlck_data *sdata = data; sdata->rc = rc; complete(&sdata->done); } /* * Perform unconditional reserve + release. */ int ccw_device_stlck(struct ccw_device *cdev) { struct subchannel *sch = to_subchannel(cdev->dev.parent); struct stlck_data data; u8 *buffer; int rc; /* Check if steal lock operation is valid for this device. */ if (cdev->drv) { if (!cdev->private->options.force) return -EINVAL; } buffer = kzalloc(64, GFP_DMA | GFP_KERNEL); if (!buffer) return -ENOMEM; init_completion(&data.done); data.rc = -EIO; spin_lock_irq(sch->lock); rc = cio_enable_subchannel(sch, (u32) (addr_t) sch); if (rc) goto out_unlock; /* Perform operation. */ cdev->private->state = DEV_STATE_STEAL_LOCK, ccw_device_stlck_start(cdev, &data, &buffer[0], &buffer[32]); spin_unlock_irq(sch->lock); /* Wait for operation to finish. */ if (wait_for_completion_interruptible(&data.done)) { /* Got a signal. */ spin_lock_irq(sch->lock); ccw_request_cancel(cdev); spin_unlock_irq(sch->lock); wait_for_completion(&data.done); } rc = data.rc; /* Check results. */ spin_lock_irq(sch->lock); cio_disable_subchannel(sch); cdev->private->state = DEV_STATE_BOXED; out_unlock: spin_unlock_irq(sch->lock); kfree(buffer); return rc; } 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); /** * ccw_device_tm_start_key - perform start function * @cdev: ccw device on which to perform the start function * @tcw: transport-command word to be started * @intparm: user defined parameter to be passed to the interrupt handler * @lpm: mask of paths to use * @key: storage key to use for storage access * * Start the tcw on the given ccw device. Return zero on success, non-zero * otherwise. */ int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw, unsigned long intparm, u8 lpm, u8 key) { struct subchannel *sch; int rc; sch = to_subchannel(cdev->dev.parent); if (!sch->schib.pmcw.ena) return -EINVAL; if (cdev->private->state != DEV_STATE_ONLINE) return -EIO; /* Adjust requested path mask to excluded varied off paths. */ if (lpm) { lpm &= sch->opm; if (lpm == 0) return -EACCES; } rc = cio_tm_start_key(sch, tcw, lpm, key); if (rc == 0) cdev->private->intparm = intparm; return rc; } EXPORT_SYMBOL(ccw_device_tm_start_key); /** * ccw_device_tm_start_timeout_key - perform start function * @cdev: ccw device on which to perform the start function * @tcw: transport-command word to be started * @intparm: user defined parameter to be passed to the interrupt handler * @lpm: mask of paths to use * @key: storage key to use for storage access * @expires: time span in jiffies after which to abort request * * Start the tcw on the given ccw device. Return zero on success, non-zero * otherwise. */ int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw, unsigned long intparm, u8 lpm, u8 key, int expires) { int ret; ccw_device_set_timeout(cdev, expires); ret = ccw_device_tm_start_key(cdev, tcw, intparm, lpm, key); if (ret != 0) ccw_device_set_timeout(cdev, 0); return ret; } EXPORT_SYMBOL(ccw_device_tm_start_timeout_key); /** * ccw_device_tm_start - perform start function * @cdev: ccw device on which to perform the start function * @tcw: transport-command word to be started * @intparm: user defined parameter to be passed to the interrupt handler * @lpm: mask of paths to use * * Start the tcw on the given ccw device. Return zero on success, non-zero * otherwise. */ int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw, unsigned long intparm, u8 lpm) { return ccw_device_tm_start_key(cdev, tcw, intparm, lpm, PAGE_DEFAULT_KEY); } EXPORT_SYMBOL(ccw_device_tm_start); /** * ccw_device_tm_start_timeout - perform start function * @cdev: ccw device on which to perform the start function * @tcw: transport-command word to be started * @intparm: user defined parameter to be passed to the interrupt handler * @lpm: mask of paths to use * @expires: time span in jiffies after which to abort request * * Start the tcw on the given ccw device. Return zero on success, non-zero * otherwise. */ int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw, unsigned long intparm, u8 lpm, int expires) { return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, PAGE_DEFAULT_KEY, expires); } EXPORT_SYMBOL(ccw_device_tm_start_timeout); /** * ccw_device_tm_intrg - perform interrogate function * @cdev: ccw device on which to perform the interrogate function * * Perform an interrogate function on the given ccw device. Return zero on * success, non-zero otherwise. */ int ccw_device_tm_intrg(struct ccw_device *cdev) { struct subchannel *sch = to_subchannel(cdev->dev.parent); if (!sch->schib.pmcw.ena) return -EINVAL; if (cdev->private->state != DEV_STATE_ONLINE) return -EIO; if (!scsw_is_tm(&sch->schib.scsw) || !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_START_PEND)) return -EINVAL; return cio_tm_intrg(sch); } EXPORT_SYMBOL(ccw_device_tm_intrg); // 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);