| // SPDX-License-Identifier: GPL-1.0+ |
| /* |
| * Copyright IBM Corp. 2002, 2009 |
| * |
| * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) |
| * Cornelia Huck (cornelia.huck@de.ibm.com) |
| */ |
| #include <linux/export.h> |
| #include <linux/init.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #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" |
| |
| /** |
| * 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 to be returned upon conclusion of csch |
| * |
| * 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_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). |
| * The interruption handler will echo back the @intparm specified here, unless |
| * another interruption parameter is specified by a subsequent invocation of |
| * ccw_device_halt() or ccw_device_clear(). |
| * 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) |
| { |
| 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 || |
| cdev->private->flags.doverify) { |
| /* Remember to fake irb when finished. */ |
| if (!cdev->private->flags.fake_irb) { |
| cdev->private->flags.fake_irb = FAKE_CMD_IRB; |
| 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))) |
| 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); |
| switch (ret) { |
| case 0: |
| cdev->private->intparm = intparm; |
| if (expires) |
| ccw_device_set_timeout(cdev, expires); |
| break; |
| case -EACCES: |
| case -ENODEV: |
| dev_fsm_event(cdev, DEV_EVENT_VERIFY); |
| break; |
| } |
| 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). |
| * The interruption handler will echo back the @intparm specified here, unless |
| * another interruption parameter is specified by a subsequent invocation of |
| * ccw_device_halt() or ccw_device_clear(). |
| * 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) |
| { |
| return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, key, |
| flags, 0); |
| } |
| |
| /** |
| * 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). |
| * The interruption handler will echo back the @intparm specified here, unless |
| * another interruption parameter is specified by a subsequent invocation of |
| * ccw_device_halt() or ccw_device_clear(). |
| * 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). |
| * The interruption handler will echo back the @intparm specified here, unless |
| * another interruption parameter is specified by a subsequent invocation of |
| * ccw_device_halt() or ccw_device_clear(). |
| * 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 to be returned upon conclusion of hsch |
| * |
| * ccw_device_halt() calls hsch on @cdev's subchannel. |
| * The interruption handler will echo back the @intparm specified here, unless |
| * another interruption parameter is specified by a subsequent invocation of |
| * ccw_device_clear(). |
| * 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); |
| } |
| |
| /** |
| * 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->dma_area->senseid.ciw[ciw_cnt].ct == ct) |
| return cdev->private->dma_area->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; |
| } |
| |
| /** |
| * ccw_device_get_chp_desc() - return newly allocated channel-path descriptor |
| * @cdev: device to obtain the descriptor for |
| * @chp_idx: index of the channel path |
| * |
| * 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_fmt0 *ccw_device_get_chp_desc(struct ccw_device *cdev, |
| int chp_idx) |
| { |
| struct subchannel *sch; |
| struct chp_id chpid; |
| |
| sch = to_subchannel(cdev->dev.parent); |
| chp_id_init(&chpid); |
| chpid.id = sch->schib.pmcw.chpid[chp_idx]; |
| return chp_get_chp_desc(chpid); |
| } |
| |
| /** |
| * ccw_device_get_util_str() - return newly allocated utility strings |
| * @cdev: device to obtain the utility strings for |
| * @chp_idx: index of the channel path |
| * |
| * On success return a newly allocated copy of the utility strings |
| * associated with the given channel path. Return %NULL on error. |
| */ |
| u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx) |
| { |
| struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| struct channel_path *chp; |
| struct chp_id chpid; |
| u8 *util_str; |
| |
| chp_id_init(&chpid); |
| chpid.id = sch->schib.pmcw.chpid[chp_idx]; |
| chp = chpid_to_chp(chpid); |
| |
| util_str = kmalloc(sizeof(chp->desc_fmt3.util_str), GFP_KERNEL); |
| if (!util_str) |
| return NULL; |
| |
| mutex_lock(&chp->lock); |
| memcpy(util_str, chp->desc_fmt3.util_str, sizeof(chp->desc_fmt3.util_str)); |
| mutex_unlock(&chp->lock); |
| |
| return util_str; |
| } |
| |
| /** |
| * 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_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) |
| { |
| struct subchannel *sch; |
| int rc; |
| |
| sch = to_subchannel(cdev->dev.parent); |
| 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; |
| } |
| if (cdev->private->state != DEV_STATE_ONLINE) |
| return -EIO; |
| /* Adjust requested path mask to exclude unusable paths. */ |
| if (lpm) { |
| lpm &= sch->lpm; |
| if (lpm == 0) |
| return -EACCES; |
| } |
| rc = cio_tm_start_key(sch, tcw, lpm, key); |
| if (rc == 0) { |
| cdev->private->intparm = intparm; |
| if (expires) |
| ccw_device_set_timeout(cdev, expires); |
| } |
| return rc; |
| } |
| EXPORT_SYMBOL(ccw_device_tm_start_timeout_key); |
| |
| /** |
| * 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) |
| { |
| return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, key, 0); |
| } |
| EXPORT_SYMBOL(ccw_device_tm_start_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_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 value 0 indicates failure. |
| */ |
| 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; |
| |
| 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; |
| |
| 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); |
| } |
| |
| return mdc; |
| } |
| EXPORT_SYMBOL(ccw_device_get_mdc); |
| |
| /** |
| * 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); |
| |
| /** |
| * 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) |
| { |
| struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| |
| *schid = sch->schid; |
| } |
| EXPORT_SYMBOL_GPL(ccw_device_get_schid); |
| |
| /** |
| * ccw_device_pnso() - Perform Network-Subchannel Operation |
| * @cdev: device on which PNSO is performed |
| * @pnso_area: request and response block for the operation |
| * @oc: Operation Code |
| * @resume_token: resume token for multiblock response |
| * @cnc: Boolean change-notification control |
| * |
| * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL) |
| * |
| * Returns 0 on success. |
| */ |
| int ccw_device_pnso(struct ccw_device *cdev, |
| struct chsc_pnso_area *pnso_area, u8 oc, |
| struct chsc_pnso_resume_token resume_token, int cnc) |
| { |
| struct subchannel_id schid; |
| |
| ccw_device_get_schid(cdev, &schid); |
| return chsc_pnso(schid, pnso_area, oc, resume_token, cnc); |
| } |
| EXPORT_SYMBOL_GPL(ccw_device_pnso); |
| |
| /** |
| * ccw_device_get_cssid() - obtain Channel Subsystem ID |
| * @cdev: device to obtain the CSSID for |
| * @cssid: The resulting Channel Subsystem ID |
| */ |
| int ccw_device_get_cssid(struct ccw_device *cdev, u8 *cssid) |
| { |
| struct device *sch_dev = cdev->dev.parent; |
| struct channel_subsystem *css = to_css(sch_dev->parent); |
| |
| if (css->id_valid) |
| *cssid = css->cssid; |
| return css->id_valid ? 0 : -ENODEV; |
| } |
| EXPORT_SYMBOL_GPL(ccw_device_get_cssid); |
| |
| /** |
| * ccw_device_get_iid() - obtain MIF-image ID |
| * @cdev: device to obtain the MIF-image ID for |
| * @iid: The resulting MIF-image ID |
| */ |
| int ccw_device_get_iid(struct ccw_device *cdev, u8 *iid) |
| { |
| struct device *sch_dev = cdev->dev.parent; |
| struct channel_subsystem *css = to_css(sch_dev->parent); |
| |
| if (css->id_valid) |
| *iid = css->iid; |
| return css->id_valid ? 0 : -ENODEV; |
| } |
| EXPORT_SYMBOL_GPL(ccw_device_get_iid); |
| |
| /** |
| * ccw_device_get_chpid() - obtain Channel Path ID |
| * @cdev: device to obtain the Channel Path ID for |
| * @chp_idx: Index of the channel path |
| * @chpid: The resulting Channel Path ID |
| */ |
| int ccw_device_get_chpid(struct ccw_device *cdev, int chp_idx, u8 *chpid) |
| { |
| struct subchannel *sch = to_subchannel(cdev->dev.parent); |
| int mask; |
| |
| if ((chp_idx < 0) || (chp_idx > 7)) |
| return -EINVAL; |
| mask = 0x80 >> chp_idx; |
| if (!(sch->schib.pmcw.pim & mask)) |
| return -ENODEV; |
| |
| *chpid = sch->schib.pmcw.chpid[chp_idx]; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(ccw_device_get_chpid); |
| |
| /** |
| * ccw_device_get_chid() - obtain Channel ID associated with specified CHPID |
| * @cdev: device to obtain the Channel ID for |
| * @chp_idx: Index of the channel path |
| * @chid: The resulting Channel ID |
| */ |
| int ccw_device_get_chid(struct ccw_device *cdev, int chp_idx, u16 *chid) |
| { |
| struct chp_id cssid_chpid; |
| struct channel_path *chp; |
| int rc; |
| |
| chp_id_init(&cssid_chpid); |
| rc = ccw_device_get_chpid(cdev, chp_idx, &cssid_chpid.id); |
| if (rc) |
| return rc; |
| chp = chpid_to_chp(cssid_chpid); |
| if (!chp) |
| return -ENODEV; |
| |
| mutex_lock(&chp->lock); |
| if (chp->desc_fmt1.flags & 0x10) |
| *chid = chp->desc_fmt1.chid; |
| else |
| rc = -ENODEV; |
| mutex_unlock(&chp->lock); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(ccw_device_get_chid); |
| |
| /* |
| * Allocate zeroed dma coherent 31 bit addressable memory using |
| * the subchannels dma pool. Maximal size of allocation supported |
| * is PAGE_SIZE. |
| */ |
| void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size) |
| { |
| void *addr; |
| |
| if (!get_device(&cdev->dev)) |
| return NULL; |
| addr = cio_gp_dma_zalloc(cdev->private->dma_pool, &cdev->dev, size); |
| if (IS_ERR_OR_NULL(addr)) |
| put_device(&cdev->dev); |
| return addr; |
| } |
| EXPORT_SYMBOL(ccw_device_dma_zalloc); |
| |
| void ccw_device_dma_free(struct ccw_device *cdev, void *cpu_addr, size_t size) |
| { |
| if (!cpu_addr) |
| return; |
| cio_gp_dma_free(cdev->private->dma_pool, cpu_addr, size); |
| put_device(&cdev->dev); |
| } |
| EXPORT_SYMBOL(ccw_device_dma_free); |
| |
| 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_GPL(ccw_device_get_chp_desc); |
| EXPORT_SYMBOL_GPL(ccw_device_get_util_str); |