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Commit b2ffd8e9 authored by Cornelia Huck's avatar Cornelia Huck Committed by Martin Schwidefsky
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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: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
parent c0208716
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Showing with 575 additions and 192 deletions
drivers/s390/cio/ccwgroup.c
View file @ b2ffd8e9
......@@ -152,16 +152,24 @@ __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
return 0;
}
/*
* try to add a new ccwgroup device for one driver
* argc and argv[] are a list of bus_id's of devices
* belonging to the driver.
/**
* ccwgroup_create() - create and register a ccw group device
* @root: parent device for the new device
* @creator_id: identifier of creating driver
* @cdrv: ccw driver of slave devices
* @argc: number of slave devices
* @argv: bus ids of slave devices
*
* Create and register a new ccw group device as a child of @root. Slave
* devices are obtained from the list of bus ids given in @argv[] and must all
* belong to @cdrv.
* Returns:
* %0 on success and an error code on failure.
* Context:
* non-atomic
*/
int
ccwgroup_create(struct device *root,
unsigned int creator_id,
struct ccw_driver *cdrv,
int argc, char *argv[])
int ccwgroup_create(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, int argc, char *argv[])
{
struct ccwgroup_device *gdev;
int i;
......@@ -390,8 +398,13 @@ static struct bus_type ccwgroup_bus_type = {
.remove = ccwgroup_remove,
};
int
ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
/**
* ccwgroup_driver_register() - register a ccw group driver
* @cdriver: driver to be registered
*
* This function is mainly a wrapper around driver_register().
*/
int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
{
/* register our new driver with the core */
cdriver->driver.bus = &ccwgroup_bus_type;
......@@ -406,8 +419,13 @@ __ccwgroup_match_all(struct device *dev, void *data)
return 1;
}
void
ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
/**
* ccwgroup_driver_unregister() - deregister a ccw group driver
* @cdriver: driver to be deregistered
*
* This function is mainly a wrapper around driver_unregister().
*/
void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
{
struct device *dev;
......@@ -427,8 +445,16 @@ ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
driver_unregister(&cdriver->driver);
}
int
ccwgroup_probe_ccwdev(struct ccw_device *cdev)
/**
* ccwgroup_probe_ccwdev() - probe function for slave devices
* @cdev: ccw device to be probed
*
* This is a dummy probe function for ccw devices that are slave devices in
* a ccw group device.
* Returns:
* always %0
*/
int ccwgroup_probe_ccwdev(struct ccw_device *cdev)
{
return 0;
}
......@@ -452,8 +478,15 @@ __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev)
return NULL;
}
void
ccwgroup_remove_ccwdev(struct ccw_device *cdev)
/**
* ccwgroup_remove_ccwdev() - remove function for slave devices
* @cdev: ccw device to be removed
*
* This is a remove function for ccw devices that are slave devices in a ccw
* group device. It sets the ccw device offline and also deregisters the
* embedding ccw group device.
*/
void ccwgroup_remove_ccwdev(struct ccw_device *cdev)
{
struct ccwgroup_device *gdev;
......
drivers/s390/cio/device.c
View file @ b2ffd8e9
......@@ -357,8 +357,18 @@ ccw_device_remove_disconnected(struct ccw_device *cdev)
cdev->private->dev_id.devno);
}
int
ccw_device_set_offline(struct ccw_device *cdev)
/**
* ccw_device_set_offline() - disable a ccw device for I/O
* @cdev: target ccw device
*
* This function calls the driver's set_offline() function for @cdev, if
* given, and then disables @cdev.
* Returns:
* %0 on success and a negative error value on failure.
* Context:
* enabled, ccw device lock not held
*/
int ccw_device_set_offline(struct ccw_device *cdev)
{
int ret;
......@@ -396,8 +406,19 @@ ccw_device_set_offline(struct ccw_device *cdev)
return ret;
}
int
ccw_device_set_online(struct ccw_device *cdev)
/**
* ccw_device_set_online() - enable a ccw device for I/O
* @cdev: target ccw device
*
* This function first enables @cdev and then calls the driver's set_online()
* function for @cdev, if given. If set_online() returns an error, @cdev is
* disabled again.
* Returns:
* %0 on success and a negative error value on failure.
* Context:
* enabled, ccw device lock not held
*/
int ccw_device_set_online(struct ccw_device *cdev)
{
int ret;
......@@ -1326,8 +1347,19 @@ __ccwdev_check_busid(struct device *dev, void *id)
}
struct ccw_device *
get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
/**
* get_ccwdev_by_busid() - obtain device from a bus id
* @cdrv: driver the device is owned by
* @bus_id: bus id of the device to be searched
*
* This function searches all devices owned by @cdrv for a device with a bus
* id matching @bus_id.
* Returns:
* If a match is found, its reference count of the found device is increased
* and it is returned; else %NULL is returned.
*/
struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
const char *bus_id)
{
struct device *dev;
struct device_driver *drv;
......@@ -1409,8 +1441,15 @@ struct bus_type ccw_bus_type = {
.remove = ccw_device_remove,
};
int
ccw_driver_register (struct ccw_driver *cdriver)
/**
* ccw_driver_register() - register a ccw driver
* @cdriver: driver to be registered
*
* This function is mainly a wrapper around driver_register().
* Returns:
* %0 on success and a negative error value on failure.
*/
int ccw_driver_register(struct ccw_driver *cdriver)
{
struct device_driver *drv = &cdriver->driver;
......@@ -1420,8 +1459,13 @@ ccw_driver_register (struct ccw_driver *cdriver)
return driver_register(drv);
}
void
ccw_driver_unregister (struct ccw_driver *cdriver)
/**
* ccw_driver_unregister() - deregister a ccw driver
* @cdriver: driver to be deregistered
*
* This function is mainly a wrapper around driver_unregister().
*/
void ccw_driver_unregister(struct ccw_driver *cdriver)
{
driver_unregister(&cdriver->driver);
}
......
drivers/s390/cio/device_ops.c
View file @ b2ffd8e9
......@@ -25,6 +25,16 @@
#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)
{
/*
......@@ -40,6 +50,15 @@ int ccw_device_set_options_mask(struct ccw_device *cdev, unsigned long flags)
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)
{
/*
......@@ -59,6 +78,13 @@ int ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
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;
......@@ -67,8 +93,22 @@ void ccw_device_clear_options(struct ccw_device *cdev, unsigned long flags)
cdev->private->options.force &= (flags & CCWDEV_ALLOW_FORCE) == 0;
}
int
ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
/**
* 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;
......@@ -89,10 +129,33 @@ ccw_device_clear(struct ccw_device *cdev, unsigned long 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;
......@@ -135,11 +198,38 @@ ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
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;
......@@ -152,18 +242,67 @@ 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,
......@@ -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 @@ ccw_device_stlck(struct ccw_device *cdev)
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;
......
include/asm-s390/ccwdev.h
View file @ b2ffd8e9
......@@ -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 *,
......
include/asm-s390/ccwgroup.h
View file @ b2ffd8e9
......@@ -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);
......
include/asm-s390/cio.h
View file @ b2ffd8e9
......@@ -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)
{
......
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