css.h

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#ifndef _CSS_H
#define _CSS_H

#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/types.h>

#include <asm/cio.h>
#include <asm/chpid.h>
#include <asm/schid.h>

#include "cio.h"

/*
 * path grouping stuff
 */
#define SPID_FUNC_SINGLE_PATH      0x00
#define SPID_FUNC_MULTI_PATH       0x80
#define SPID_FUNC_ESTABLISH    0x00
#define SPID_FUNC_RESIGN       0x40
#define SPID_FUNC_DISBAND      0x20

#define SNID_STATE1_RESET      0
#define SNID_STATE1_UNGROUPED      2
#define SNID_STATE1_GROUPED    3

#define SNID_STATE2_NOT_RESVD      0
#define SNID_STATE2_RESVD_ELSE     2
#define SNID_STATE2_RESVD_SELF     3

#define SNID_STATE3_MULTI_PATH     1
#define SNID_STATE3_SINGLE_PATH    0

struct path_state {
    __u8  state1 : 2;   /* path state value 1 */
    __u8  state2 : 2;   /* path state value 2 */
    __u8  state3 : 1;   /* path state value 3 */
    __u8  resvd  : 3;   /* reserved */
} __attribute__ ((packed));

struct extended_cssid {
    u8 version;
    u8 cssid;
} __attribute__ ((packed));

struct pgid {
    union {
        __u8 fc;    /* SPID function code */
        struct path_state ps;   /* SNID path state */
    } __attribute__ ((packed)) inf;
    union {
        __u32 cpu_addr  : 16;   /* CPU address */
        struct extended_cssid ext_cssid;
    } __attribute__ ((packed)) pgid_high;
    __u32 cpu_id    : 24;   /* CPU identification */
    __u32 cpu_model : 16;   /* CPU model */
    __u32 tod_high;     /* high word TOD clock */
} __attribute__ ((packed));

struct subchannel;
struct chp_link;
struct css_driver {
    struct css_device_id *subchannel_type;
    struct device_driver drv;
    void (*irq)(struct subchannel *);
    int (*chp_event)(struct subchannel *, struct chp_link *, int);
    int (*sch_event)(struct subchannel *, int);
    int (*probe)(struct subchannel *);
    int (*remove)(struct subchannel *);
    void (*shutdown)(struct subchannel *);
    int (*prepare) (struct subchannel *);
    void (*complete) (struct subchannel *);
    int (*freeze)(struct subchannel *);
    int (*thaw) (struct subchannel *);
    int (*restore)(struct subchannel *);
    int (*settle)(void);
};

#define to_cssdriver(n) container_of(n, struct css_driver, drv)

extern int css_driver_register(struct css_driver *);
extern void css_driver_unregister(struct css_driver *);

extern void css_sch_device_unregister(struct subchannel *);
extern int css_probe_device(struct subchannel_id);
extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
extern int css_init_done;
extern int max_ssid;
int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
                   int (*fn_unknown)(struct subchannel_id,
                   void *), void *data);
extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
extern void css_reiterate_subchannels(void);
void css_update_ssd_info(struct subchannel *sch);

struct channel_subsystem {
    u8 cssid;
    int valid;
    struct channel_path *chps[__MAX_CHPID + 1];
    struct device device;
    struct pgid global_pgid;
    struct mutex mutex;
    /* channel measurement related */
    int cm_enabled;
    void *cub_addr1;
    void *cub_addr2;
    /* for orphaned ccw devices */
    struct subchannel *pseudo_subchannel;
};
#define to_css(dev) container_of(dev, struct channel_subsystem, device)

extern struct channel_subsystem *channel_subsystems[];

void channel_subsystem_reinit(void);

/* Helper functions to build lists for the slow path. */
void css_schedule_eval(struct subchannel_id schid);
void css_schedule_eval_all(void);
int css_complete_work(void);

int sch_is_pseudo_sch(struct subchannel *);
struct schib;
int css_sch_is_valid(struct schib *);

extern struct workqueue_struct *cio_work_q;
void css_wait_for_slow_path(void);
void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
#endif