diff options
Diffstat (limited to 'drivers/s390/cio/device_ops.c')
| -rw-r--r-- | drivers/s390/cio/device_ops.c | 900 |
1 files changed, 549 insertions, 351 deletions
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c index ad3fe5aeb66..f3c417943da 100644 --- a/drivers/s390/cio/device_ops.c +++ b/drivers/s390/cio/device_ops.c @@ -1,14 +1,9 @@ /* - * drivers/s390/cio/device_ops.c + * Copyright IBM Corp. 2002, 2009 * - * $Revision: 1.57 $ - * - * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, - * IBM Corporation - * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) - * Cornelia Huck (cohuck@de.ibm.com) + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) */ -#include <linux/config.h> #include <linux/module.h> #include <linux/init.h> #include <linux/errno.h> @@ -16,18 +11,31 @@ #include <linux/list.h> #include <linux/device.h> #include <linux/delay.h> +#include <linux/completion.h> #include <asm/ccwdev.h> #include <asm/idals.h> +#include <asm/chpid.h> +#include <asm/fcx.h> #include "cio.h" #include "cio_debug.h" #include "css.h" #include "chsc.h" #include "device.h" +#include "chp.h" -int -ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) +/** + * 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 ... @@ -39,51 +47,158 @@ ccw_device_set_options(struct ccw_device *cdev, unsigned long flags) 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; } -int -ccw_device_clear(struct ccw_device *cdev, unsigned long intparm) +/** + * 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) + 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_WAIT4IO && cdev->private->state != DEV_STATE_W4SENSE) return -EINVAL; - sch = to_subchannel(cdev->dev.parent); - if (!sch) - return -ENODEV; + ret = cio_clear(sch); if (ret == 0) cdev->private->intparm = intparm; return ret; } -int -ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa, - unsigned long intparm, __u8 lpm, __u8 key, - unsigned long flags) +/** + * 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) + if (!cdev || !cdev->dev.parent) return -ENODEV; sch = to_subchannel(cdev->dev.parent); - if (!sch) - return -ENODEV; + 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->flags.fake_irb = FAKE_CMD_IRB; cdev->private->intparm = intparm; return 0; } else @@ -91,24 +206,64 @@ ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa, return -EBUSY; } if (cdev->private->state != DEV_STATE_ONLINE || - ((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) && - !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) || + ((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 exclude unusable paths. */ + if (lpm) { + lpm &= sch->lpm; + if (lpm == 0) + return -EACCES; + } ret = cio_start_key (sch, cpa, lpm, key); - if (ret == 0) + switch (ret) { + case 0: cdev->private->intparm = intparm; + break; + case -EACCES: + case -ENODEV: + dev_fsm_event(cdev, DEV_EVENT_VERIFY); + break; + } return ret; } - -int -ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa, - unsigned long intparm, __u8 lpm, __u8 key, - unsigned long flags, int expires) +/** + * 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; @@ -121,18 +276,67 @@ ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa, return ret; } -int -ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa, - unsigned long intparm, __u8 lpm, unsigned long flags) +/** + * 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); } -int -ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa, - unsigned long intparm, __u8 lpm, unsigned long flags, - int expires) +/** + * 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, @@ -140,43 +344,70 @@ ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa, } -int -ccw_device_halt(struct ccw_device *cdev, unsigned long intparm) +/** + * 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) + 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_WAIT4IO && cdev->private->state != DEV_STATE_W4SENSE) return -EINVAL; - sch = to_subchannel(cdev->dev.parent); - if (!sch) - return -ENODEV; + ret = cio_halt(sch); if (ret == 0) cdev->private->intparm = intparm; return ret; } -int -ccw_device_resume(struct ccw_device *cdev) +/** + * 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) + if (!cdev || !cdev->dev.parent) return -ENODEV; sch = to_subchannel(cdev->dev.parent); - if (!sch) - return -ENODEV; + 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.actl & SCSW_ACTL_SUSPENDED)) + !(sch->schib.scsw.cmd.actl & SCSW_ACTL_SUSPENDED)) return -EINVAL; return cio_resume(sch); } @@ -187,12 +418,9 @@ ccw_device_resume(struct ccw_device *cdev) 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 @@ -201,7 +429,7 @@ ccw_device_call_handler(struct ccw_device *cdev) * - fast notification was requested (primary status) * - unsolicited interrupts */ - stctl = cdev->private->irb.scsw.stctl; + 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); @@ -212,6 +440,9 @@ ccw_device_call_handler(struct ccw_device *cdev) (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. */ @@ -227,11 +458,21 @@ ccw_device_call_handler(struct ccw_device *cdev) return 1; } -/* - * Search for CIW command in extended sense data. +/** + * 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) +struct ciw *ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct) { int ciw_cnt; @@ -243,347 +484,309 @@ ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct) return NULL; } -__u8 -ccw_device_get_path_mask(struct ccw_device *cdev) +/** + * 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; - sch = to_subchannel(cdev->dev.parent); - if (!sch) + if (!cdev->dev.parent) return 0; - else - return sch->vpm; + + sch = to_subchannel(cdev->dev.parent); + return sch->lpm; } -static void -ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb) +struct stlck_data { + struct completion done; + int rc; +}; + +void ccw_device_stlck_done(struct ccw_device *cdev, void *data, int rc) { - if (!ip) - /* unsolicited interrupt */ - return; - - /* Abuse intparm for error reporting. */ - if (IS_ERR(irb)) - cdev->private->intparm = -EIO; - else if ((irb->scsw.dstat != - (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) || - (irb->scsw.cstat != 0)) { - /* - * We didn't get channel end / device end. Check if path - * verification has been started; we can retry after it has - * finished. We also retry unit checks except for command reject - * or intervention required. - */ - if (cdev->private->flags.doverify || - cdev->private->state == DEV_STATE_VERIFY) - cdev->private->intparm = -EAGAIN; - if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && - !(irb->ecw[0] & - (SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ))) - cdev->private->intparm = -EAGAIN; - else - cdev->private->intparm = -EIO; - - } else - cdev->private->intparm = 0; - wake_up(&cdev->private->wait_q); + struct stlck_data *sdata = data; + + sdata->rc = rc; + complete(&sdata->done); } -static inline int -__ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm) +/* + * Perform unconditional reserve + release. + */ +int ccw_device_stlck(struct ccw_device *cdev) { - int ret; - struct subchannel *sch; - - sch = to_subchannel(cdev->dev.parent); - do { - ret = cio_start (sch, ccw, lpm); - if ((ret == -EBUSY) || (ret == -EACCES)) { - /* Try again later. */ - spin_unlock_irq(&sch->lock); - msleep(10); - spin_lock_irq(&sch->lock); - continue; - } - if (ret != 0) - /* Non-retryable error. */ - break; - /* Wait for end of request. */ - cdev->private->intparm = magic; - spin_unlock_irq(&sch->lock); - wait_event(cdev->private->wait_q, - (cdev->private->intparm == -EIO) || - (cdev->private->intparm == -EAGAIN) || - (cdev->private->intparm == 0)); - spin_lock_irq(&sch->lock); - /* Check at least for channel end / device end */ - if (cdev->private->intparm == -EIO) { - /* Non-retryable error. */ - ret = -EIO; - break; - } - if (cdev->private->intparm == 0) - /* Success. */ - break; - /* Try again later. */ - spin_unlock_irq(&sch->lock); - msleep(10); - spin_lock_irq(&sch->lock); - } while (1); + 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 ret; + return rc; } /** - * read_dev_chars() - read device characteristics - * @param cdev target ccw device - * @param buffer pointer to buffer for rdc data - * @param length size of rdc data - * @returns 0 for success, negative error value on failure + * chp_get_chp_desc - return newly allocated channel-path descriptor + * @cdev: device to obtain the descriptor for + * @chp_idx: index of the channel path * - * Context: - * called for online device, lock not held - **/ -int -read_dev_chars (struct ccw_device *cdev, void **buffer, int length) + * On success return a newly allocated copy of the channel-path description + * data associated with the given channel path. Return %NULL on error. + */ +struct channel_path_desc *ccw_device_get_chp_desc(struct ccw_device *cdev, + int chp_idx) { - void (*handler)(struct ccw_device *, unsigned long, struct irb *); struct subchannel *sch; - int ret; - struct ccw1 *rdc_ccw; + struct chp_id chpid; - if (!cdev) - return -ENODEV; - if (!buffer || !length) - return -EINVAL; sch = to_subchannel(cdev->dev.parent); + chp_id_init(&chpid); + chpid.id = sch->schib.pmcw.chpid[chp_idx]; + return chp_get_chp_desc(chpid); +} - CIO_TRACE_EVENT (4, "rddevch"); - CIO_TRACE_EVENT (4, sch->dev.bus_id); - - rdc_ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); - if (!rdc_ccw) - return -ENOMEM; - memset(rdc_ccw, 0, sizeof(struct ccw1)); - rdc_ccw->cmd_code = CCW_CMD_RDC; - rdc_ccw->count = length; - rdc_ccw->flags = CCW_FLAG_SLI; - ret = set_normalized_cda (rdc_ccw, (*buffer)); - if (ret != 0) { - kfree(rdc_ccw); - return ret; - } - - spin_lock_irq(&sch->lock); - /* Save interrupt handler. */ - handler = cdev->handler; - /* Temporarily install own handler. */ - cdev->handler = ccw_device_wake_up; - if (cdev->private->state != DEV_STATE_ONLINE) - ret = -ENODEV; - else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) && - !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) || - cdev->private->flags.doverify) - ret = -EBUSY; - else - /* 0x00D9C4C3 == ebcdic "RDC" */ - ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0); - - /* Restore interrupt handler. */ - cdev->handler = handler; - spin_unlock_irq(&sch->lock); - - clear_normalized_cda (rdc_ccw); - kfree(rdc_ccw); - - return ret; +/** + * 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); -/* - * Read Configuration data using path mask +/** + * 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 -read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lpm) +int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm, u8 key) { - void (*handler)(struct ccw_device *, unsigned long, struct irb *); struct subchannel *sch; - struct ciw *ciw; - char *rcd_buf; - int ret; - struct ccw1 *rcd_ccw; + int rc; - if (!cdev) - return -ENODEV; - if (!buffer || !length) - return -EINVAL; sch = to_subchannel(cdev->dev.parent); - - CIO_TRACE_EVENT (4, "rdconf"); - CIO_TRACE_EVENT (4, sch->dev.bus_id); - - /* - * scan for RCD command in extended SenseID data - */ - ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD); - if (!ciw || ciw->cmd == 0) - return -EOPNOTSUPP; - - rcd_ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); - if (!rcd_ccw) - return -ENOMEM; - memset(rcd_ccw, 0, sizeof(struct ccw1)); - rcd_buf = kmalloc(ciw->count, GFP_KERNEL | GFP_DMA); - if (!rcd_buf) { - kfree(rcd_ccw); - return -ENOMEM; + if (!sch->schib.pmcw.ena) + return -EINVAL; + if (cdev->private->state == DEV_STATE_VERIFY) { + /* Remember to fake irb when finished. */ + if (!cdev->private->flags.fake_irb) { + cdev->private->flags.fake_irb = FAKE_TM_IRB; + cdev->private->intparm = intparm; + return 0; + } else + /* There's already a fake I/O around. */ + return -EBUSY; } - memset (rcd_buf, 0, ciw->count); - rcd_ccw->cmd_code = ciw->cmd; - rcd_ccw->cda = (__u32) __pa (rcd_buf); - rcd_ccw->count = ciw->count; - rcd_ccw->flags = CCW_FLAG_SLI; - - spin_lock_irq(&sch->lock); - /* Save interrupt handler. */ - handler = cdev->handler; - /* Temporarily install own handler. */ - cdev->handler = ccw_device_wake_up; if (cdev->private->state != DEV_STATE_ONLINE) - ret = -ENODEV; - else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) && - !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) || - cdev->private->flags.doverify) - ret = -EBUSY; - else - /* 0x00D9C3C4 == ebcdic "RCD" */ - ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm); - - /* Restore interrupt handler. */ - cdev->handler = handler; - spin_unlock_irq(&sch->lock); - - /* - * on success we update the user input parms - */ - if (ret) { - kfree (rcd_buf); - *buffer = NULL; - *length = 0; - } else { - *length = ciw->count; - *buffer = rcd_buf; + return -EIO; + /* Adjust requested path mask to exclude unusable paths. */ + if (lpm) { + lpm &= sch->lpm; + if (lpm == 0) + return -EACCES; } - kfree(rcd_ccw); + 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); -/* - * Read Configuration data +/** + * 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 -read_conf_data (struct ccw_device *cdev, void **buffer, int *length) +int ccw_device_tm_start(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm) { - return read_conf_data_lpm (cdev, buffer, length, 0); + return ccw_device_tm_start_key(cdev, tcw, intparm, lpm, + PAGE_DEFAULT_KEY); } +EXPORT_SYMBOL(ccw_device_tm_start); -/* - * Try to break the lock on a boxed device. +/** + * 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_stlck(struct ccw_device *cdev) +int ccw_device_tm_start_timeout(struct ccw_device *cdev, struct tcw *tcw, + unsigned long intparm, u8 lpm, int expires) { - void *buf, *buf2; - unsigned long flags; - struct subchannel *sch; - int ret; - - if (!cdev) - return -ENODEV; + return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, + PAGE_DEFAULT_KEY, expires); +} +EXPORT_SYMBOL(ccw_device_tm_start_timeout); - if (cdev->drv && !cdev->private->options.force) - return -EINVAL; +/** + * ccw_device_get_mdc - accumulate max data count + * @cdev: ccw device for which the max data count is accumulated + * @mask: mask of paths to use + * + * Return the number of 64K-bytes blocks all paths at least support + * for a transport command. Return values <= 0 indicate failures. + */ +int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct channel_path *chp; + struct chp_id chpid; + int mdc = 0, i; + + /* Adjust requested path mask to excluded varied off paths. */ + if (mask) + mask &= sch->lpm; + else + mask = sch->lpm; - sch = to_subchannel(cdev->dev.parent); - - CIO_TRACE_EVENT(2, "stl lock"); - CIO_TRACE_EVENT(2, cdev->dev.bus_id); + chp_id_init(&chpid); + for (i = 0; i < 8; i++) { + if (!(mask & (0x80 >> i))) + continue; + chpid.id = sch->schib.pmcw.chpid[i]; + chp = chpid_to_chp(chpid); + if (!chp) + continue; - 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; + mutex_lock(&chp->lock); + if (!chp->desc_fmt1.f) { + mutex_unlock(&chp->lock); + return 0; + } + if (!chp->desc_fmt1.r) + mdc = 1; + mdc = mdc ? min_t(int, mdc, chp->desc_fmt1.mdc) : + chp->desc_fmt1.mdc; + mutex_unlock(&chp->lock); } - cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND; - spin_unlock_irqrestore(&sch->lock, flags); - wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0); - spin_lock_irqsave(&sch->lock, flags); - cio_disable_subchannel(sch); //FIXME: return code? - if ((cdev->private->irb.scsw.dstat != - (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) || - (cdev->private->irb.scsw.cstat != 0)) - ret = -EIO; - /* Clear irb. */ - memset(&cdev->private->irb, 0, sizeof(struct irb)); -out_unlock: - if (buf) - kfree(buf); - if (buf2) - kfree(buf2); - spin_unlock_irqrestore(&sch->lock, flags); - return ret; + + return mdc; } +EXPORT_SYMBOL(ccw_device_get_mdc); -void * -ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no) +/** + * 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; + struct subchannel *sch = to_subchannel(cdev->dev.parent); - sch = to_subchannel(cdev->dev.parent); - return chsc_get_chp_desc(sch, chp_no); + 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) +/** + * ccw_device_get_schid - obtain a subchannel id + * @cdev: device to obtain the id for + * @schid: where to fill in the values + */ +void ccw_device_get_schid(struct ccw_device *cdev, struct subchannel_id *schid) { - return cdev->private->irq; -} + struct subchannel *sch = to_subchannel(cdev->dev.parent); -int -_ccw_device_get_device_number(struct ccw_device *cdev) -{ - return cdev->private->devno; + *schid = sch->schid; } - +EXPORT_SYMBOL_GPL(ccw_device_get_schid); 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); @@ -593,9 +796,4 @@ EXPORT_SYMBOL(ccw_device_start_timeout_key); EXPORT_SYMBOL(ccw_device_start_key); EXPORT_SYMBOL(ccw_device_get_ciw); EXPORT_SYMBOL(ccw_device_get_path_mask); -EXPORT_SYMBOL(read_conf_data); -EXPORT_SYMBOL(read_dev_chars); -EXPORT_SYMBOL(_ccw_device_get_subchannel_number); -EXPORT_SYMBOL(_ccw_device_get_device_number); EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc); -EXPORT_SYMBOL_GPL(read_conf_data_lpm); |