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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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454e1fa1eb
Split setting (driver wants feature enabled) and status (feature setup was successful) for PGID related ccw device features so that setup errors can be detected. Previously, incorrectly handled setup errors could in rare cases lead to erratic I/O behavior and permanently unusuable devices. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
206 lines
6.9 KiB
C
206 lines
6.9 KiB
C
/*
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* Copyright IBM Corp. 2002, 2009
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*
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* Author(s): Arnd Bergmann <arndb@de.ibm.com>
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*
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* Interface for CCW device drivers
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*/
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#ifndef _S390_CCWDEV_H_
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#define _S390_CCWDEV_H_
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <asm/fcx.h>
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/* structs from asm/cio.h */
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struct irb;
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struct ccw1;
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struct ccw_dev_id;
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/* simplified initializers for struct ccw_device:
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* CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
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* entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
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#define CCW_DEVICE(cu, cum) \
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.cu_type=(cu), .cu_model=(cum), \
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.match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE \
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| (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
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#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \
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.cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
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.match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE \
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| ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \
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| CCW_DEVICE_ID_MATCH_DEVICE_TYPE \
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| ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
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/* scan through an array of device ids and return the first
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* entry that matches the device.
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*
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* the array must end with an entry containing zero match_flags
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*/
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static inline const struct ccw_device_id *
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ccw_device_id_match(const struct ccw_device_id *array,
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const struct ccw_device_id *match)
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{
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const struct ccw_device_id *id = array;
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for (id = array; id->match_flags; id++) {
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
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&& (id->cu_type != match->cu_type))
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continue;
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
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&& (id->cu_model != match->cu_model))
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continue;
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
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&& (id->dev_type != match->dev_type))
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continue;
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
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&& (id->dev_model != match->dev_model))
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continue;
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return id;
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}
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return NULL;
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}
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/**
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* struct ccw_device - channel attached device
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* @ccwlock: pointer to device lock
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* @id: id of this device
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* @drv: ccw driver for this device
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* @dev: embedded device structure
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* @online: online status of device
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* @handler: interrupt handler
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*
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* @handler is a member of the device rather than the driver since a driver
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* can have different interrupt handlers for different ccw devices
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* (multi-subchannel drivers).
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*/
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struct ccw_device {
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spinlock_t *ccwlock;
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/* private: */
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struct ccw_device_private *private; /* cio private information */
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/* public: */
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struct ccw_device_id id;
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struct ccw_driver *drv;
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struct device dev;
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int online;
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void (*handler) (struct ccw_device *, unsigned long, struct irb *);
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};
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/**
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* struct ccw driver - device driver for channel attached devices
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* @owner: owning module
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* @ids: ids supported by this driver
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* @probe: function called on probe
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* @remove: function called on remove
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* @set_online: called when setting device online
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* @set_offline: called when setting device offline
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* @notify: notify driver of device state changes
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* @shutdown: called at device shutdown
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* @prepare: prepare for pm state transition
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* @complete: undo work done in @prepare
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* @freeze: callback for freezing during hibernation snapshotting
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* @thaw: undo work done in @freeze
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* @restore: callback for restoring after hibernation
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* @driver: embedded device driver structure
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* @name: device driver name
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*/
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struct ccw_driver {
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struct module *owner;
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struct ccw_device_id *ids;
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int (*probe) (struct ccw_device *);
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void (*remove) (struct ccw_device *);
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int (*set_online) (struct ccw_device *);
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int (*set_offline) (struct ccw_device *);
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int (*notify) (struct ccw_device *, int);
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void (*shutdown) (struct ccw_device *);
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int (*prepare) (struct ccw_device *);
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void (*complete) (struct ccw_device *);
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int (*freeze)(struct ccw_device *);
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int (*thaw) (struct ccw_device *);
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int (*restore)(struct ccw_device *);
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struct device_driver driver;
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char *name;
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};
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extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
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const char *bus_id);
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/* devices drivers call these during module load and unload.
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* When a driver is registered, its probe method is called
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* when new devices for its type pop up */
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extern int ccw_driver_register (struct ccw_driver *driver);
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extern void ccw_driver_unregister (struct ccw_driver *driver);
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struct ccw1;
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extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
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extern int ccw_device_set_options(struct ccw_device *, unsigned long);
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extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
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int ccw_device_is_pathgroup(struct ccw_device *cdev);
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int ccw_device_is_multipath(struct ccw_device *cdev);
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/* Allow for i/o completion notification after primary interrupt status. */
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#define CCWDEV_EARLY_NOTIFICATION 0x0001
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/* Report all interrupt conditions. */
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#define CCWDEV_REPORT_ALL 0x0002
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/* Try to perform path grouping. */
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#define CCWDEV_DO_PATHGROUP 0x0004
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/* Allow forced onlining of boxed devices. */
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#define CCWDEV_ALLOW_FORCE 0x0008
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/* Try to use multipath mode. */
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#define CCWDEV_DO_MULTIPATH 0x0010
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extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, unsigned long);
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extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, unsigned long, int);
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extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, __u8, unsigned long);
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extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, __u8,
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unsigned long, int);
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extern int ccw_device_resume(struct ccw_device *);
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extern int ccw_device_halt(struct ccw_device *, unsigned long);
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extern int ccw_device_clear(struct ccw_device *, unsigned long);
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int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
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unsigned long intparm, u8 lpm, u8 key);
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int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
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unsigned long, u8, u8);
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int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
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unsigned long, u8, u8, int);
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int ccw_device_tm_start(struct ccw_device *, struct tcw *,
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unsigned long, u8);
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int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
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unsigned long, u8, int);
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int ccw_device_tm_intrg(struct ccw_device *cdev);
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extern int ccw_device_set_online(struct ccw_device *cdev);
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extern int ccw_device_set_offline(struct ccw_device *cdev);
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extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
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extern __u8 ccw_device_get_path_mask(struct ccw_device *);
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extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
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#define get_ccwdev_lock(x) (x)->ccwlock
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#define to_ccwdev(n) container_of(n, struct ccw_device, dev)
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#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
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extern struct ccw_device *ccw_device_probe_console(void);
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extern int ccw_device_force_console(void);
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// FIXME: these have to go
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extern int _ccw_device_get_subchannel_number(struct ccw_device *);
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extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
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#endif /* _S390_CCWDEV_H_ */
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