14556b33f2
Use cio_register_early_subchannels to register early subchannels which are already in use. Call this function before we do the actual subchannel scanning loop. This helps us to get rid of some more special cases regarding the console subchannel. Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
149 lines
4.4 KiB
C
149 lines
4.4 KiB
C
#ifndef _CSS_H
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#define _CSS_H
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#include <linux/mutex.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/device.h>
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#include <linux/types.h>
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#include <asm/cio.h>
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#include <asm/chpid.h>
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#include <asm/schid.h>
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#include "cio.h"
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/*
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* path grouping stuff
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*/
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#define SPID_FUNC_SINGLE_PATH 0x00
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#define SPID_FUNC_MULTI_PATH 0x80
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#define SPID_FUNC_ESTABLISH 0x00
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#define SPID_FUNC_RESIGN 0x40
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#define SPID_FUNC_DISBAND 0x20
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#define SNID_STATE1_RESET 0
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#define SNID_STATE1_UNGROUPED 2
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#define SNID_STATE1_GROUPED 3
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#define SNID_STATE2_NOT_RESVD 0
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#define SNID_STATE2_RESVD_ELSE 2
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#define SNID_STATE2_RESVD_SELF 3
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#define SNID_STATE3_MULTI_PATH 1
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#define SNID_STATE3_SINGLE_PATH 0
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struct path_state {
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__u8 state1 : 2; /* path state value 1 */
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__u8 state2 : 2; /* path state value 2 */
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__u8 state3 : 1; /* path state value 3 */
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__u8 resvd : 3; /* reserved */
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} __attribute__ ((packed));
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struct extended_cssid {
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u8 version;
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u8 cssid;
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} __attribute__ ((packed));
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struct pgid {
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union {
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__u8 fc; /* SPID function code */
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struct path_state ps; /* SNID path state */
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} __attribute__ ((packed)) inf;
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union {
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__u32 cpu_addr : 16; /* CPU address */
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struct extended_cssid ext_cssid;
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} __attribute__ ((packed)) pgid_high;
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__u32 cpu_id : 24; /* CPU identification */
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__u32 cpu_model : 16; /* CPU model */
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__u32 tod_high; /* high word TOD clock */
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} __attribute__ ((packed));
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struct subchannel;
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struct chp_link;
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/**
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* struct css_driver - device driver for subchannels
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* @subchannel_type: subchannel type supported by this driver
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* @drv: embedded device driver structure
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* @irq: called on interrupts
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* @chp_event: called for events affecting a channel path
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* @sch_event: called for events affecting the subchannel
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* @probe: function called on probe
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* @remove: function called on remove
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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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* @settle: wait for asynchronous work to finish
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*/
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struct css_driver {
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struct css_device_id *subchannel_type;
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struct device_driver drv;
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void (*irq)(struct subchannel *);
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int (*chp_event)(struct subchannel *, struct chp_link *, int);
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int (*sch_event)(struct subchannel *, int);
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int (*probe)(struct subchannel *);
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int (*remove)(struct subchannel *);
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void (*shutdown)(struct subchannel *);
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int (*prepare) (struct subchannel *);
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void (*complete) (struct subchannel *);
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int (*freeze)(struct subchannel *);
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int (*thaw) (struct subchannel *);
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int (*restore)(struct subchannel *);
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int (*settle)(void);
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};
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#define to_cssdriver(n) container_of(n, struct css_driver, drv)
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extern int css_driver_register(struct css_driver *);
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extern void css_driver_unregister(struct css_driver *);
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extern void css_sch_device_unregister(struct subchannel *);
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extern int css_probe_device(struct subchannel_id);
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extern int css_register_subchannel(struct subchannel *);
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extern struct subchannel *css_alloc_subchannel(struct subchannel_id);
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extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
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extern int css_init_done;
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extern int max_ssid;
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int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
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int (*fn_unknown)(struct subchannel_id,
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void *), void *data);
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extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
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extern void css_reiterate_subchannels(void);
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void css_update_ssd_info(struct subchannel *sch);
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struct channel_subsystem {
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u8 cssid;
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int valid;
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struct channel_path *chps[__MAX_CHPID + 1];
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struct device device;
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struct pgid global_pgid;
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struct mutex mutex;
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/* channel measurement related */
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int cm_enabled;
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void *cub_addr1;
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void *cub_addr2;
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/* for orphaned ccw devices */
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struct subchannel *pseudo_subchannel;
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};
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#define to_css(dev) container_of(dev, struct channel_subsystem, device)
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extern struct channel_subsystem *channel_subsystems[];
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void channel_subsystem_reinit(void);
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/* Helper functions to build lists for the slow path. */
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void css_schedule_eval(struct subchannel_id schid);
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void css_schedule_eval_all(void);
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int css_complete_work(void);
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int sch_is_pseudo_sch(struct subchannel *);
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struct schib;
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int css_sch_is_valid(struct schib *);
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extern struct workqueue_struct *cio_work_q;
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void css_wait_for_slow_path(void);
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void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
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#endif
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