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[S390] cio: Add docbook comments.
Comment a bunch of function in docbook style and convert existing comments on structures to docbook. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Cornelia Huck
Martin Schwidefsky
parent
c02087162a
commit
b2ffd8e9a7
6 changed files with 575 additions and 192 deletions
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@ -152,16 +152,24 @@ __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
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return 0;
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}
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/*
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* try to add a new ccwgroup device for one driver
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* argc and argv[] are a list of bus_id's of devices
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* belonging to the driver.
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/**
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* ccwgroup_create() - create and register a ccw group device
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* @root: parent device for the new device
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* @creator_id: identifier of creating driver
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* @cdrv: ccw driver of slave devices
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* @argc: number of slave devices
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* @argv: bus ids of slave devices
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*
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* Create and register a new ccw group device as a child of @root. Slave
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* devices are obtained from the list of bus ids given in @argv[] and must all
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* belong to @cdrv.
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* Returns:
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* %0 on success and an error code on failure.
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* Context:
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* non-atomic
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*/
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int
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ccwgroup_create(struct device *root,
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unsigned int creator_id,
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struct ccw_driver *cdrv,
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int argc, char *argv[])
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int ccwgroup_create(struct device *root, unsigned int creator_id,
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struct ccw_driver *cdrv, int argc, char *argv[])
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{
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struct ccwgroup_device *gdev;
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int i;
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@ -390,8 +398,13 @@ static struct bus_type ccwgroup_bus_type = {
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.remove = ccwgroup_remove,
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};
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int
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ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
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/**
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* ccwgroup_driver_register() - register a ccw group driver
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* @cdriver: driver to be registered
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*
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* This function is mainly a wrapper around driver_register().
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*/
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int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
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{
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/* register our new driver with the core */
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cdriver->driver.bus = &ccwgroup_bus_type;
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@ -406,8 +419,13 @@ __ccwgroup_match_all(struct device *dev, void *data)
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return 1;
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}
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void
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ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
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/**
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* ccwgroup_driver_unregister() - deregister a ccw group driver
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* @cdriver: driver to be deregistered
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*
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* This function is mainly a wrapper around driver_unregister().
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*/
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void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
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{
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struct device *dev;
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@ -427,8 +445,16 @@ ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
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driver_unregister(&cdriver->driver);
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}
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int
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ccwgroup_probe_ccwdev(struct ccw_device *cdev)
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/**
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* ccwgroup_probe_ccwdev() - probe function for slave devices
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* @cdev: ccw device to be probed
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*
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* This is a dummy probe function for ccw devices that are slave devices in
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* a ccw group device.
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* Returns:
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* always %0
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*/
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int ccwgroup_probe_ccwdev(struct ccw_device *cdev)
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{
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return 0;
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}
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@ -452,8 +478,15 @@ __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev)
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return NULL;
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}
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void
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ccwgroup_remove_ccwdev(struct ccw_device *cdev)
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/**
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* ccwgroup_remove_ccwdev() - remove function for slave devices
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* @cdev: ccw device to be removed
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*
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* This is a remove function for ccw devices that are slave devices in a ccw
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* group device. It sets the ccw device offline and also deregisters the
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* embedding ccw group device.
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*/
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void ccwgroup_remove_ccwdev(struct ccw_device *cdev)
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{
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struct ccwgroup_device *gdev;
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@ -357,8 +357,18 @@ ccw_device_remove_disconnected(struct ccw_device *cdev)
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cdev->private->dev_id.devno);
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}
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int
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ccw_device_set_offline(struct ccw_device *cdev)
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/**
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* ccw_device_set_offline() - disable a ccw device for I/O
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* @cdev: target ccw device
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*
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* This function calls the driver's set_offline() function for @cdev, if
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* given, and then disables @cdev.
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* Returns:
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* %0 on success and a negative error value on failure.
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* Context:
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* enabled, ccw device lock not held
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*/
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int ccw_device_set_offline(struct ccw_device *cdev)
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{
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int ret;
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@ -396,8 +406,19 @@ ccw_device_set_offline(struct ccw_device *cdev)
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return ret;
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}
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int
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ccw_device_set_online(struct ccw_device *cdev)
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/**
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* ccw_device_set_online() - enable a ccw device for I/O
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* @cdev: target ccw device
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*
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* This function first enables @cdev and then calls the driver's set_online()
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* function for @cdev, if given. If set_online() returns an error, @cdev is
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* disabled again.
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* Returns:
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* %0 on success and a negative error value on failure.
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* Context:
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* enabled, ccw device lock not held
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*/
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int ccw_device_set_online(struct ccw_device *cdev)
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{
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int ret;
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@ -1326,8 +1347,19 @@ __ccwdev_check_busid(struct device *dev, void *id)
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}
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struct ccw_device *
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get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
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/**
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* get_ccwdev_by_busid() - obtain device from a bus id
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* @cdrv: driver the device is owned by
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* @bus_id: bus id of the device to be searched
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*
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* This function searches all devices owned by @cdrv for a device with a bus
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* id matching @bus_id.
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* Returns:
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* If a match is found, its reference count of the found device is increased
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* and it is returned; else %NULL is returned.
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*/
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struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
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const char *bus_id)
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{
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struct device *dev;
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struct device_driver *drv;
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@ -1409,8 +1441,15 @@ struct bus_type ccw_bus_type = {
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.remove = ccw_device_remove,
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};
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int
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ccw_driver_register (struct ccw_driver *cdriver)
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/**
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* ccw_driver_register() - register a ccw driver
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* @cdriver: driver to be registered
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*
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* This function is mainly a wrapper around driver_register().
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* Returns:
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* %0 on success and a negative error value on failure.
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*/
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int ccw_driver_register(struct ccw_driver *cdriver)
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{
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struct device_driver *drv = &cdriver->driver;
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@ -1420,8 +1459,13 @@ ccw_driver_register (struct ccw_driver *cdriver)
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return driver_register(drv);
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}
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void
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ccw_driver_unregister (struct ccw_driver *cdriver)
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/**
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* ccw_driver_unregister() - deregister a ccw driver
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* @cdriver: driver to be deregistered
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*
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* This function is mainly a wrapper around driver_unregister().
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*/
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void ccw_driver_unregister(struct ccw_driver *cdriver)
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{
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driver_unregister(&cdriver->driver);
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}
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@ -25,6 +25,16 @@
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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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@ -40,6 +50,15 @@ int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
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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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@ -59,6 +78,13 @@ int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
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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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@ -67,8 +93,22 @@ void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
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cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
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}
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int
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ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
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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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@ -89,10 +129,33 @@ ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
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return ret;
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}
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int
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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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* 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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@ -135,11 +198,38 @@ ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
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return ret;
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}
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int
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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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* 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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@ -152,18 +242,67 @@ ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
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return ret;
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}
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int
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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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* 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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int
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ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
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unsigned long intparm, __u8 lpm, unsigned long flags,
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int expires)
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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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*/
|
||||
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,
|
||||
|
|
@ -171,8 +310,23 @@ 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;
|
||||
|
|
@ -193,8 +347,20 @@ ccw_device_halt(struct ccw_device *cdev, unsigned long 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;
|
||||
|
||||
|
|
@ -260,11 +426,21 @@ 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;
|
||||
|
||||
|
|
@ -276,8 +452,14 @@ 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;
|
||||
|
||||
|
|
@ -357,8 +539,7 @@ out_unlock:
|
|||
return ret;
|
||||
}
|
||||
|
||||
void *
|
||||
ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
|
||||
void *ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
|
||||
{
|
||||
struct subchannel *sch;
|
||||
struct chp_id chpid;
|
||||
|
|
|
|||
|
|
@ -67,36 +67,53 @@ ccw_device_id_match(const struct ccw_device_id *array,
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/* The struct ccw device is our replacement for the globally accessible
|
||||
* ioinfo array. ioinfo will mutate into a subchannel device later.
|
||||
/**
|
||||
* struct ccw_device - channel attached device
|
||||
* @ccwlock: pointer to device lock
|
||||
* @id: id of this device
|
||||
* @drv: ccw driver for this device
|
||||
* @dev: embedded device structure
|
||||
* @online: online status of device
|
||||
* @handler: interrupt handler
|
||||
*
|
||||
* Reference: Documentation/s390/driver-model.txt */
|
||||
* @handler is a member of the device rather than the driver since a driver
|
||||
* can have different interrupt handlers for different ccw devices
|
||||
* (multi-subchannel drivers).
|
||||
*/
|
||||
struct ccw_device {
|
||||
spinlock_t *ccwlock;
|
||||
/* private: */
|
||||
struct ccw_device_private *private; /* cio private information */
|
||||
struct ccw_device_id id; /* id of this device, driver_info is
|
||||
set by ccw_find_driver */
|
||||
struct ccw_driver *drv; /* */
|
||||
struct device dev; /* */
|
||||
/* public: */
|
||||
struct ccw_device_id id;
|
||||
struct ccw_driver *drv;
|
||||
struct device dev;
|
||||
int online;
|
||||
/* This is sick, but a driver can have different interrupt handlers
|
||||
for different ccw_devices (multi-subchannel drivers)... */
|
||||
void (*handler) (struct ccw_device *, unsigned long, struct irb *);
|
||||
};
|
||||
|
||||
|
||||
/* Each ccw driver registers with the ccw root bus */
|
||||
/**
|
||||
* struct ccw driver - device driver for channel attached devices
|
||||
* @owner: owning module
|
||||
* @ids: ids supported by this driver
|
||||
* @probe: function called on probe
|
||||
* @remove: function called on remove
|
||||
* @set_online: called when setting device online
|
||||
* @set_offline: called when setting device offline
|
||||
* @notify: notify driver of device state changes
|
||||
* @driver: embedded device driver structure
|
||||
* @name: device driver name
|
||||
*/
|
||||
struct ccw_driver {
|
||||
struct module *owner; /* for automatic MOD_INC_USE_COUNT */
|
||||
struct ccw_device_id *ids; /* probe driver with these devs */
|
||||
int (*probe) (struct ccw_device *); /* ask driver to probe dev */
|
||||
struct module *owner;
|
||||
struct ccw_device_id *ids;
|
||||
int (*probe) (struct ccw_device *);
|
||||
void (*remove) (struct ccw_device *);
|
||||
/* device is no longer available */
|
||||
int (*set_online) (struct ccw_device *);
|
||||
int (*set_offline) (struct ccw_device *);
|
||||
int (*notify) (struct ccw_device *, int);
|
||||
struct device_driver driver; /* higher level structure, don't init
|
||||
this from your driver */
|
||||
struct device_driver driver;
|
||||
char *name;
|
||||
};
|
||||
|
||||
|
|
@ -124,36 +141,10 @@ extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
|
|||
/* Allow forced onlining of boxed devices. */
|
||||
#define CCWDEV_ALLOW_FORCE 0x0008
|
||||
|
||||
/*
|
||||
* ccw_device_start()
|
||||
*
|
||||
* 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).
|
||||
* Depending on the action taken, ccw_device_start() returns:
|
||||
* 0 - Success
|
||||
* -EBUSY - Device busy, or status pending
|
||||
* -ENODEV - Device not operational
|
||||
* -EINVAL - Device invalid for operation
|
||||
*/
|
||||
extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
|
||||
unsigned long, __u8, unsigned long);
|
||||
/*
|
||||
* ccw_device_start_timeout()
|
||||
*
|
||||
* This function notifies the device driver if the channel program has not
|
||||
* completed during the specified time. If a timeout occurs, the channel
|
||||
* program is terminated via xsch(), hsch() or csch().
|
||||
*/
|
||||
extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
|
||||
unsigned long, __u8, unsigned long, int);
|
||||
/*
|
||||
* ccw_device_start_key()
|
||||
* ccw_device_start_key_timeout()
|
||||
*
|
||||
* Same as ccw_device_start() and ccw_device_start_timeout(), except a
|
||||
* storage key != default key can be provided for the I/O.
|
||||
*/
|
||||
extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
|
||||
unsigned long, __u8, __u8, unsigned long);
|
||||
extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
|
||||
|
|
|
|||
|
|
@ -4,19 +4,41 @@
|
|||
struct ccw_device;
|
||||
struct ccw_driver;
|
||||
|
||||
/**
|
||||
* struct ccwgroup_device - ccw group device
|
||||
* @creator_id: unique number of the driver
|
||||
* @state: online/offline state
|
||||
* @count: number of attached slave devices
|
||||
* @dev: embedded device structure
|
||||
* @cdev: variable number of slave devices, allocated as needed
|
||||
*/
|
||||
struct ccwgroup_device {
|
||||
unsigned long creator_id; /* unique number of the driver */
|
||||
unsigned long creator_id;
|
||||
enum {
|
||||
CCWGROUP_OFFLINE,
|
||||
CCWGROUP_ONLINE,
|
||||
} state;
|
||||
/* private: */
|
||||
atomic_t onoff;
|
||||
struct mutex reg_mutex;
|
||||
unsigned int count; /* number of attached slave devices */
|
||||
struct device dev; /* master device */
|
||||
struct ccw_device *cdev[0]; /* variable number, allocate as needed */
|
||||
/* public: */
|
||||
unsigned int count;
|
||||
struct device dev;
|
||||
struct ccw_device *cdev[0];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ccwgroup_driver - driver for ccw group devices
|
||||
* @owner: driver owner
|
||||
* @name: driver name
|
||||
* @max_slaves: maximum number of slave devices
|
||||
* @driver_id: unique id
|
||||
* @probe: function called on probe
|
||||
* @remove: function called on remove
|
||||
* @set_online: function called when device is set online
|
||||
* @set_offline: function called when device is set offline
|
||||
* @driver: embedded driver structure
|
||||
*/
|
||||
struct ccwgroup_driver {
|
||||
struct module *owner;
|
||||
char *name;
|
||||
|
|
@ -28,7 +50,7 @@ struct ccwgroup_driver {
|
|||
int (*set_online) (struct ccwgroup_device *);
|
||||
int (*set_offline) (struct ccwgroup_device *);
|
||||
|
||||
struct device_driver driver; /* this driver */
|
||||
struct device_driver driver;
|
||||
};
|
||||
|
||||
extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
|
||||
|
|
|
|||
|
|
@ -15,30 +15,50 @@
|
|||
#define LPM_ANYPATH 0xff
|
||||
#define __MAX_CSSID 0
|
||||
|
||||
/*
|
||||
* subchannel status word
|
||||
/**
|
||||
* struct scsw - subchannel status word
|
||||
* @key: subchannel key
|
||||
* @sctl: suspend control
|
||||
* @eswf: esw format
|
||||
* @cc: deferred condition code
|
||||
* @fmt: format
|
||||
* @pfch: prefetch
|
||||
* @isic: initial-status interruption control
|
||||
* @alcc: adress-limit checking control
|
||||
* @ssi: supress-suspended interruption
|
||||
* @zcc: zero condition code
|
||||
* @ectl: extended control
|
||||
* @pno: path not operational
|
||||
* @res: reserved
|
||||
* @fctl: function control
|
||||
* @actl: activity control
|
||||
* @stctl: status control
|
||||
* @cpa: channel program address
|
||||
* @dstat: device status
|
||||
* @cstat: subchannel status
|
||||
* @count: residual count
|
||||
*/
|
||||
struct scsw {
|
||||
__u32 key : 4; /* subchannel key */
|
||||
__u32 sctl : 1; /* suspend control */
|
||||
__u32 eswf : 1; /* ESW format */
|
||||
__u32 cc : 2; /* deferred condition code */
|
||||
__u32 fmt : 1; /* format */
|
||||
__u32 pfch : 1; /* prefetch */
|
||||
__u32 isic : 1; /* initial-status interruption control */
|
||||
__u32 alcc : 1; /* address-limit checking control */
|
||||
__u32 ssi : 1; /* supress-suspended interruption */
|
||||
__u32 zcc : 1; /* zero condition code */
|
||||
__u32 ectl : 1; /* extended control */
|
||||
__u32 pno : 1; /* path not operational */
|
||||
__u32 res : 1; /* reserved */
|
||||
__u32 fctl : 3; /* function control */
|
||||
__u32 actl : 7; /* activity control */
|
||||
__u32 stctl : 5; /* status control */
|
||||
__u32 cpa; /* channel program address */
|
||||
__u32 dstat : 8; /* device status */
|
||||
__u32 cstat : 8; /* subchannel status */
|
||||
__u32 count : 16; /* residual count */
|
||||
__u32 key : 4;
|
||||
__u32 sctl : 1;
|
||||
__u32 eswf : 1;
|
||||
__u32 cc : 2;
|
||||
__u32 fmt : 1;
|
||||
__u32 pfch : 1;
|
||||
__u32 isic : 1;
|
||||
__u32 alcc : 1;
|
||||
__u32 ssi : 1;
|
||||
__u32 zcc : 1;
|
||||
__u32 ectl : 1;
|
||||
__u32 pno : 1;
|
||||
__u32 res : 1;
|
||||
__u32 fctl : 3;
|
||||
__u32 actl : 7;
|
||||
__u32 stctl : 5;
|
||||
__u32 cpa;
|
||||
__u32 dstat : 8;
|
||||
__u32 cstat : 8;
|
||||
__u32 count : 16;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
#define SCSW_FCTL_CLEAR_FUNC 0x1
|
||||
|
|
@ -110,11 +130,22 @@ struct scsw {
|
|||
#define SNS2_ENV_DATA_PRESENT 0x10
|
||||
#define SNS2_INPRECISE_END 0x04
|
||||
|
||||
/**
|
||||
* struct ccw1 - channel command word
|
||||
* @cmd_code: command code
|
||||
* @flags: flags, like IDA adressing, etc.
|
||||
* @count: byte count
|
||||
* @cda: data address
|
||||
*
|
||||
* The ccw is the basic structure to build channel programs that perform
|
||||
* operations with the device or the control unit. Only Format-1 channel
|
||||
* command words are supported.
|
||||
*/
|
||||
struct ccw1 {
|
||||
__u8 cmd_code; /* command code */
|
||||
__u8 flags; /* flags, like IDA addressing, etc. */
|
||||
__u16 count; /* byte count */
|
||||
__u32 cda; /* data address */
|
||||
__u8 cmd_code;
|
||||
__u8 flags;
|
||||
__u16 count;
|
||||
__u32 cda;
|
||||
} __attribute__ ((packed,aligned(8)));
|
||||
|
||||
#define CCW_FLAG_DC 0x80
|
||||
|
|
@ -140,102 +171,162 @@ struct ccw1 {
|
|||
|
||||
#define SENSE_MAX_COUNT 0x20
|
||||
|
||||
/**
|
||||
* struct erw - extended report word
|
||||
* @res0: reserved
|
||||
* @auth: authorization check
|
||||
* @pvrf: path-verification-required flag
|
||||
* @cpt: channel-path timeout
|
||||
* @fsavf: failing storage address validity flag
|
||||
* @cons: concurrent sense
|
||||
* @scavf: secondary ccw address validity flag
|
||||
* @fsaf: failing storage address format
|
||||
* @scnt: sense count, if @cons == %1
|
||||
* @res16: reserved
|
||||
*/
|
||||
struct erw {
|
||||
__u32 res0 : 3; /* reserved */
|
||||
__u32 auth : 1; /* Authorization check */
|
||||
__u32 pvrf : 1; /* path-verification-required flag */
|
||||
__u32 cpt : 1; /* channel-path timeout */
|
||||
__u32 fsavf : 1; /* Failing storage address validity flag */
|
||||
__u32 cons : 1; /* concurrent-sense */
|
||||
__u32 scavf : 1; /* Secondary ccw address validity flag */
|
||||
__u32 fsaf : 1; /* Failing storage address format */
|
||||
__u32 scnt : 6; /* sense count if cons == 1 */
|
||||
__u32 res16 : 16; /* reserved */
|
||||
__u32 res0 : 3;
|
||||
__u32 auth : 1;
|
||||
__u32 pvrf : 1;
|
||||
__u32 cpt : 1;
|
||||
__u32 fsavf : 1;
|
||||
__u32 cons : 1;
|
||||
__u32 scavf : 1;
|
||||
__u32 fsaf : 1;
|
||||
__u32 scnt : 6;
|
||||
__u32 res16 : 16;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* subchannel logout area
|
||||
/**
|
||||
* struct sublog - subchannel logout area
|
||||
* @res0: reserved
|
||||
* @esf: extended status flags
|
||||
* @lpum: last path used mask
|
||||
* @arep: ancillary report
|
||||
* @fvf: field-validity flags
|
||||
* @sacc: storage access code
|
||||
* @termc: termination code
|
||||
* @devsc: device-status check
|
||||
* @serr: secondary error
|
||||
* @ioerr: i/o-error alert
|
||||
* @seqc: sequence code
|
||||
*/
|
||||
struct sublog {
|
||||
__u32 res0 : 1; /* reserved */
|
||||
__u32 esf : 7; /* extended status flags */
|
||||
__u32 lpum : 8; /* last path used mask */
|
||||
__u32 arep : 1; /* ancillary report */
|
||||
__u32 fvf : 5; /* field-validity flags */
|
||||
__u32 sacc : 2; /* storage access code */
|
||||
__u32 termc : 2; /* termination code */
|
||||
__u32 devsc : 1; /* device-status check */
|
||||
__u32 serr : 1; /* secondary error */
|
||||
__u32 ioerr : 1; /* i/o-error alert */
|
||||
__u32 seqc : 3; /* sequence code */
|
||||
__u32 res0 : 1;
|
||||
__u32 esf : 7;
|
||||
__u32 lpum : 8;
|
||||
__u32 arep : 1;
|
||||
__u32 fvf : 5;
|
||||
__u32 sacc : 2;
|
||||
__u32 termc : 2;
|
||||
__u32 devsc : 1;
|
||||
__u32 serr : 1;
|
||||
__u32 ioerr : 1;
|
||||
__u32 seqc : 3;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* Format 0 Extended Status Word (ESW)
|
||||
/**
|
||||
* struct esw0 - Format 0 Extended Status Word (ESW)
|
||||
* @sublog: subchannel logout
|
||||
* @erw: extended report word
|
||||
* @faddr: failing storage address
|
||||
* @saddr: secondary ccw address
|
||||
*/
|
||||
struct esw0 {
|
||||
struct sublog sublog; /* subchannel logout */
|
||||
struct erw erw; /* extended report word */
|
||||
__u32 faddr[2]; /* failing storage address */
|
||||
__u32 saddr; /* secondary ccw address */
|
||||
struct sublog sublog;
|
||||
struct erw erw;
|
||||
__u32 faddr[2];
|
||||
__u32 saddr;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* Format 1 Extended Status Word (ESW)
|
||||
/**
|
||||
* struct esw1 - Format 1 Extended Status Word (ESW)
|
||||
* @zero0: reserved zeros
|
||||
* @lpum: last path used mask
|
||||
* @zero16: reserved zeros
|
||||
* @erw: extended report word
|
||||
* @zeros: three fullwords of zeros
|
||||
*/
|
||||
struct esw1 {
|
||||
__u8 zero0; /* reserved zeros */
|
||||
__u8 lpum; /* last path used mask */
|
||||
__u16 zero16; /* reserved zeros */
|
||||
struct erw erw; /* extended report word */
|
||||
__u32 zeros[3]; /* 2 fullwords of zeros */
|
||||
__u8 zero0;
|
||||
__u8 lpum;
|
||||
__u16 zero16;
|
||||
struct erw erw;
|
||||
__u32 zeros[3];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* Format 2 Extended Status Word (ESW)
|
||||
/**
|
||||
* struct esw2 - Format 2 Extended Status Word (ESW)
|
||||
* @zero0: reserved zeros
|
||||
* @lpum: last path used mask
|
||||
* @dcti: device-connect-time interval
|
||||
* @erw: extended report word
|
||||
* @zeros: three fullwords of zeros
|
||||
*/
|
||||
struct esw2 {
|
||||
__u8 zero0; /* reserved zeros */
|
||||
__u8 lpum; /* last path used mask */
|
||||
__u16 dcti; /* device-connect-time interval */
|
||||
struct erw erw; /* extended report word */
|
||||
__u32 zeros[3]; /* 2 fullwords of zeros */
|
||||
__u8 zero0;
|
||||
__u8 lpum;
|
||||
__u16 dcti;
|
||||
struct erw erw;
|
||||
__u32 zeros[3];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* Format 3 Extended Status Word (ESW)
|
||||
/**
|
||||
* struct esw3 - Format 3 Extended Status Word (ESW)
|
||||
* @zero0: reserved zeros
|
||||
* @lpum: last path used mask
|
||||
* @res: reserved
|
||||
* @erw: extended report word
|
||||
* @zeros: three fullwords of zeros
|
||||
*/
|
||||
struct esw3 {
|
||||
__u8 zero0; /* reserved zeros */
|
||||
__u8 lpum; /* last path used mask */
|
||||
__u16 res; /* reserved */
|
||||
struct erw erw; /* extended report word */
|
||||
__u32 zeros[3]; /* 2 fullwords of zeros */
|
||||
__u8 zero0;
|
||||
__u8 lpum;
|
||||
__u16 res;
|
||||
struct erw erw;
|
||||
__u32 zeros[3];
|
||||
} __attribute__ ((packed));
|
||||
|
||||
/*
|
||||
* interruption response block
|
||||
/**
|
||||
* struct irb - interruption response block
|
||||
* @scsw: subchannel status word
|
||||
* @esw: extened status word, 4 formats
|
||||
* @ecw: extended control word
|
||||
*
|
||||
* The irb that is handed to the device driver when an interrupt occurs. For
|
||||
* solicited interrupts, the common I/O layer already performs checks whether
|
||||
* a field is valid; a field not being valid is always passed as %0.
|
||||
* If a unit check occured, @ecw may contain sense data; this is retrieved
|
||||
* by the common I/O layer itself if the device doesn't support concurrent
|
||||
* sense (so that the device driver never needs to perform basic sene itself).
|
||||
* For unsolicited interrupts, the irb is passed as-is (expect for sense data,
|
||||
* if applicable).
|
||||
*/
|
||||
struct irb {
|
||||
struct scsw scsw; /* subchannel status word */
|
||||
union { /* extended status word, 4 formats */
|
||||
struct scsw scsw;
|
||||
union {
|
||||
struct esw0 esw0;
|
||||
struct esw1 esw1;
|
||||
struct esw2 esw2;
|
||||
struct esw3 esw3;
|
||||
} esw;
|
||||
__u8 ecw[32]; /* extended control word */
|
||||
__u8 ecw[32];
|
||||
} __attribute__ ((packed,aligned(4)));
|
||||
|
||||
/*
|
||||
* command information word (CIW) layout
|
||||
/**
|
||||
* struct ciw - command information word (CIW) layout
|
||||
* @et: entry type
|
||||
* @reserved: reserved bits
|
||||
* @ct: command type
|
||||
* @cmd: command code
|
||||
* @count: command count
|
||||
*/
|
||||
struct ciw {
|
||||
__u32 et : 2; /* entry type */
|
||||
__u32 reserved : 2; /* reserved */
|
||||
__u32 ct : 4; /* command type */
|
||||
__u32 cmd : 8; /* command */
|
||||
__u32 count : 16; /* coun */
|
||||
__u32 et : 2;
|
||||
__u32 reserved : 2;
|
||||
__u32 ct : 4;
|
||||
__u32 cmd : 8;
|
||||
__u32 count : 16;
|
||||
} __attribute__ ((packed));
|
||||
|
||||
#define CIW_TYPE_RCD 0x0 /* read configuration data */
|
||||
|
|
@ -258,11 +349,32 @@ struct ciw {
|
|||
/* Sick revalidation of device. */
|
||||
#define CIO_REVALIDATE 0x0008
|
||||
|
||||
/**
|
||||
* struct ccw_dev_id - unique identifier for ccw devices
|
||||
* @ssid: subchannel set id
|
||||
* @devno: device number
|
||||
*
|
||||
* This structure is not directly based on any hardware structure. The
|
||||
* hardware identifies a device by its device number and its subchannel,
|
||||
* which is in turn identified by its id. In order to get a unique identifier
|
||||
* for ccw devices across subchannel sets, @struct ccw_dev_id has been
|
||||
* introduced.
|
||||
*/
|
||||
struct ccw_dev_id {
|
||||
u8 ssid;
|
||||
u16 devno;
|
||||
};
|
||||
|
||||
/**
|
||||
* ccw_device_id_is_equal() - compare two ccw_dev_ids
|
||||
* @dev_id1: a ccw_dev_id
|
||||
* @dev_id2: another ccw_dev_id
|
||||
* Returns:
|
||||
* %1 if the two structures are equal field-by-field,
|
||||
* %0 if not.
|
||||
* Context:
|
||||
* any
|
||||
*/
|
||||
static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
|
||||
struct ccw_dev_id *dev_id2)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in a new issue