io_sch.h

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#ifndef S390_IO_SCH_H
#define S390_IO_SCH_H

#include <linux/types.h>
#include <asm/schid.h>
#include <asm/ccwdev.h>
#include <asm/irq.h>
#include "css.h"
#include "orb.h"

struct io_subchannel_private {
    union orb orb;      /* operation request block */
    struct ccw1 sense_ccw;  /* static ccw for sense command */
    struct ccw_device *cdev;/* pointer to the child ccw device */
    struct {
        unsigned int suspend:1; /* allow suspend */
        unsigned int prefetch:1;/* deny prefetch */
        unsigned int inter:1;   /* suppress intermediate interrupts */
    } __packed options;
} __aligned(8);

#define to_io_private(n) ((struct io_subchannel_private *) \
              dev_get_drvdata(&(n)->dev))
#define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))

static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
{
    struct io_subchannel_private *priv = to_io_private(sch);
    return priv ? priv->cdev : NULL;
}

static inline void sch_set_cdev(struct subchannel *sch,
                struct ccw_device *cdev)
{
    struct io_subchannel_private *priv = to_io_private(sch);
    if (priv)
        priv->cdev = cdev;
}

#define MAX_CIWS 8

/*
 * Possible status values for a CCW request's I/O.
 */
enum io_status {
    IO_DONE,
    IO_RUNNING,
    IO_STATUS_ERROR,
    IO_PATH_ERROR,
    IO_REJECTED,
    IO_KILLED
};

struct ccw_request {
    struct ccw1 *cp;
    unsigned long timeout;
    u16 maxretries;
    u8 lpm;
    int (*check)(struct ccw_device *, void *);
    enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
                 enum io_status);
    void (*callback)(struct ccw_device *, void *, int);
    void *data;
    unsigned int singlepath:1;
    /* These fields are used internally. */
    unsigned int cancel:1;
    unsigned int done:1;
    u16 mask;
    u16 retries;
    int drc;
} __attribute__((packed));

/*
 * sense-id response buffer layout
 */
struct senseid {
    /* common part */
    u8  reserved;   /* always 0x'FF' */
    u16 cu_type;    /* control unit type */
    u8  cu_model;   /* control unit model */
    u16 dev_type;   /* device type */
    u8  dev_model;  /* device model */
    u8  unused; /* padding byte */
    /* extended part */
    struct ciw ciw[MAX_CIWS];   /* variable # of CIWs */
}  __attribute__ ((packed, aligned(4)));

enum cdev_todo {
    CDEV_TODO_NOTHING,
    CDEV_TODO_ENABLE_CMF,
    CDEV_TODO_REBIND,
    CDEV_TODO_REGISTER,
    CDEV_TODO_UNREG,
    CDEV_TODO_UNREG_EVAL,
};

#define FAKE_CMD_IRB    1
#define FAKE_TM_IRB 2

struct ccw_device_private {
    struct ccw_device *cdev;
    struct subchannel *sch;
    int state;      /* device state */
    atomic_t onoff;
    struct ccw_dev_id dev_id;   /* device id */
    struct subchannel_id schid; /* subchannel number */
    struct ccw_request req;     /* internal I/O request */
    int iretry;
    u8 pgid_valid_mask; /* mask of valid PGIDs */
    u8 pgid_todo_mask;  /* mask of PGIDs to be adjusted */
    u8 pgid_reset_mask; /* mask of PGIDs which were reset */
    u8 path_gone_mask;  /* mask of paths, that became unavailable */
    u8 path_new_mask;   /* mask of paths, that became available */
    struct {
        unsigned int fast:1;    /* post with "channel end" */
        unsigned int repall:1;  /* report every interrupt status */
        unsigned int pgroup:1;  /* do path grouping */
        unsigned int force:1;   /* allow forced online */
        unsigned int mpath:1;   /* do multipathing */
    } __attribute__ ((packed)) options;
    struct {
        unsigned int esid:1;        /* Ext. SenseID supported by HW */
        unsigned int dosense:1;     /* delayed SENSE required */
        unsigned int doverify:1;    /* delayed path verification */
        unsigned int donotify:1;    /* call notify function */
        unsigned int recog_done:1;  /* dev. recog. complete */
        unsigned int fake_irb:2;    /* deliver faked irb */
        unsigned int resuming:1;    /* recognition while resume */
        unsigned int pgroup:1;      /* pathgroup is set up */
        unsigned int mpath:1;       /* multipathing is set up */
        unsigned int initialized:1; /* set if initial reference held */
    } __attribute__((packed)) flags;
    unsigned long intparm;  /* user interruption parameter */
    struct qdio_irq *qdio_data;
    struct irb irb;     /* device status */
    struct senseid senseid; /* SenseID info */
    struct pgid pgid[8];    /* path group IDs per chpid*/
    struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
    struct work_struct todo_work;
    enum cdev_todo todo;
    wait_queue_head_t wait_q;
    struct timer_list timer;
    void *cmb;          /* measurement information */
    struct list_head cmb_list;  /* list of measured devices */
    u64 cmb_start_time;     /* clock value of cmb reset */
    void *cmb_wait;         /* deferred cmb enable/disable */
    enum interruption_class int_class;
};

static inline int rsch(struct subchannel_id schid)
{
    register struct subchannel_id reg1 asm("1") = schid;
    int ccode;

    asm volatile(
        "   rsch\n"
        "   ipm %0\n"
        "   srl %0,28"
        : "=d" (ccode)
        : "d" (reg1)
        : "cc", "memory");
    return ccode;
}

static inline int hsch(struct subchannel_id schid)
{
    register struct subchannel_id reg1 asm("1") = schid;
    int ccode;

    asm volatile(
        "   hsch\n"
        "   ipm %0\n"
        "   srl %0,28"
        : "=d" (ccode)
        : "d" (reg1)
        : "cc");
    return ccode;
}

static inline int xsch(struct subchannel_id schid)
{
    register struct subchannel_id reg1 asm("1") = schid;
    int ccode;

    asm volatile(
        "   .insn   rre,0xb2760000,%1,0\n"
        "   ipm %0\n"
        "   srl %0,28"
        : "=d" (ccode)
        : "d" (reg1)
        : "cc");
    return ccode;
}

#endif