37db8985b2
As virtio-ccw devices are channel devices, we need to use the dma area within the common I/O layer for any communication with the hypervisor. Note that we do not need to use that area for control blocks directly referenced by instructions, e.g. the orb. It handles neither QDIO in the common code, nor any device type specific stuff (like channel programs constructed by the DASD driver). An interesting side effect is that virtio structures are now going to get allocated in 31 bit addressable storage. Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Sebastian Ott <sebott@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
240 lines
8.2 KiB
C
240 lines
8.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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#include <asm/irq.h>
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#include <asm/schid.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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* Possible events used by the path_event notifier.
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*/
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#define PE_NONE 0x0
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#define PE_PATH_GONE 0x1 /* A path is no longer available. */
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#define PE_PATH_AVAILABLE 0x2 /* A path has become available and
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was successfully verified. */
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#define PE_PATHGROUP_ESTABLISHED 0x4 /* A pathgroup was reset and had
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to be established again. */
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/*
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* Possible CIO actions triggered by the unit check handler.
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*/
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enum uc_todo {
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UC_TODO_RETRY,
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UC_TODO_RETRY_ON_NEW_PATH,
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UC_TODO_STOP
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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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* @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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* @path_event: notify driver of channel path events
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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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* @uc_handler: callback for unit check handler
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* @driver: embedded device driver structure
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* @int_class: interruption class to use for accounting interrupts
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*/
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struct ccw_driver {
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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 (*path_event) (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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enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
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struct device_driver driver;
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enum interruption_class int_class;
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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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int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
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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_create_console(struct ccw_driver *);
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extern void ccw_device_destroy_console(struct ccw_device *);
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extern int ccw_device_enable_console(struct ccw_device *);
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extern void ccw_device_wait_idle(struct ccw_device *);
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extern int ccw_device_force_console(struct ccw_device *);
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extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size);
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extern void ccw_device_dma_free(struct ccw_device *cdev,
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void *cpu_addr, size_t size);
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int ccw_device_siosl(struct ccw_device *);
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extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
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struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int);
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u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx);
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#endif /* _S390_CCWDEV_H_ */
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