drivers/s390/cio/css.h

   1 #ifndef _CSS_H
   2 #define _CSS_H
   3
   4 #include <linux/wait.h>
   5 #include <linux/workqueue.h>
   6
   7 #include <asm/cio.h>
   8
   9 #include "schid.h"
  10
  11 /*
  12  * path grouping stuff
  13  */
  14 #define SPID_FUNC_SINGLE_PATH      0x00
  15 #define SPID_FUNC_MULTI_PATH       0x80
  16 #define SPID_FUNC_ESTABLISH        0x00
  17 #define SPID_FUNC_RESIGN           0x40
  18 #define SPID_FUNC_DISBAND          0x20
  19
  20 #define SNID_STATE1_RESET          0
  21 #define SNID_STATE1_UNGROUPED      2
  22 #define SNID_STATE1_GROUPED        3
  23
  24 #define SNID_STATE2_NOT_RESVD      0
  25 #define SNID_STATE2_RESVD_ELSE     2
  26 #define SNID_STATE2_RESVD_SELF     3
  27
  28 #define SNID_STATE3_MULTI_PATH     1
  29 #define SNID_STATE3_SINGLE_PATH    0
  30
  31 struct path_state {
  32         __u8  state1 : 2;       /* path state value 1 */
  33         __u8  state2 : 2;       /* path state value 2 */
  34         __u8  state3 : 1;       /* path state value 3 */
  35         __u8  resvd  : 3;       /* reserved */
  36 } __attribute__ ((packed));
  37
  38 struct pgid {
  39         union {
  40                 __u8 fc;        /* SPID function code */
  41                 struct path_state ps;   /* SNID path state */
  42         } inf;
  43         __u32 cpu_addr  : 16;   /* CPU address */
  44         __u32 cpu_id    : 24;   /* CPU identification */
  45         __u32 cpu_model : 16;   /* CPU model */
  46         __u32 tod_high;         /* high word TOD clock */
  47 } __attribute__ ((packed));
  48
  49 extern struct pgid global_pgid;
  50
  51 #define MAX_CIWS 8
  52
  53 /*
  54  * sense-id response buffer layout
  55  */
  56 struct senseid {
  57         /* common part */
  58         __u8  reserved;         /* always 0x'FF' */
  59         __u16 cu_type;          /* control unit type */
  60         __u8  cu_model;         /* control unit model */
  61         __u16 dev_type;         /* device type */
  62         __u8  dev_model;        /* device model */
  63         __u8  unused;           /* padding byte */
  64         /* extended part */
  65         struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
  66 }  __attribute__ ((packed,aligned(4)));
  67
  68 struct ccw_device_private {
  69         int state;              /* device state */
  70         atomic_t onoff;
  71         unsigned long registered;
  72         __u16 devno;            /* device number */
  73         __u16 sch_no;           /* subchannel number */
  74         __u8 imask;             /* lpm mask for SNID/SID/SPGID */
  75         int iretry;             /* retry counter SNID/SID/SPGID */
  76         struct {
  77                 unsigned int fast:1;    /* post with "channel end" */
  78                 unsigned int repall:1;  /* report every interrupt status */
  79                 unsigned int pgroup:1;  /* do path grouping */
  80                 unsigned int force:1;   /* allow forced online */
  81         } __attribute__ ((packed)) options;
  82         struct {
  83                 unsigned int pgid_single:1; /* use single path for Set PGID */
  84                 unsigned int esid:1;        /* Ext. SenseID supported by HW */
  85                 unsigned int dosense:1;     /* delayed SENSE required */
  86                 unsigned int doverify:1;    /* delayed path verification */
  87                 unsigned int donotify:1;    /* call notify function */
  88                 unsigned int recog_done:1;  /* dev. recog. complete */
  89                 unsigned int fake_irb:1;    /* deliver faked irb */
  90         } __attribute__((packed)) flags;
  91         unsigned long intparm;  /* user interruption parameter */
  92         struct qdio_irq *qdio_data;
  93         struct irb irb;         /* device status */
  94         struct senseid senseid; /* SenseID info */
  95         struct pgid pgid;       /* path group ID */
  96         struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
  97         struct work_struct kick_work;
  98         wait_queue_head_t wait_q;
  99         struct timer_list timer;
 100         void *cmb;                      /* measurement information */
 101         struct list_head cmb_list;      /* list of measured devices */
 102         u64 cmb_start_time;             /* clock value of cmb reset */
 103         void *cmb_wait;                 /* deferred cmb enable/disable */
 104 };
 105
 106 /*
 107  * A css driver handles all subchannels of one type.
 108  * Currently, we only care about I/O subchannels (type 0), these
 109  * have a ccw_device connected to them.
 110  */
 111 struct css_driver {
 112         unsigned int subchannel_type;
 113         struct device_driver drv;
 114         void (*irq)(struct device *);
 115         int (*notify)(struct device *, int);
 116         void (*verify)(struct device *);
 117         void (*termination)(struct device *);
 118 };
 119
 120 /*
 121  * all css_drivers have the css_bus_type
 122  */
 123 extern struct bus_type css_bus_type;
 124 extern struct css_driver io_subchannel_driver;
 125
 126 extern int css_probe_device(struct subchannel_id);
 127 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
 128 extern int css_init_done;
 129
 130 #define __MAX_SUBCHANNEL 65535
 131
 132 extern struct bus_type css_bus_type;
 133 extern struct device css_bus_device;
 134
 135 /* Some helper functions for disconnected state. */
 136 int device_is_disconnected(struct subchannel *);
 137 void device_set_disconnected(struct subchannel *);
 138 void device_trigger_reprobe(struct subchannel *);
 139
 140 /* Helper functions for vary on/off. */
 141 int device_is_online(struct subchannel *);
 142 void device_set_waiting(struct subchannel *);
 143
 144 /* Machine check helper function. */
 145 void device_kill_pending_timer(struct subchannel *);
 146
 147 /* Helper functions to build lists for the slow path. */
 148 extern int css_enqueue_subchannel_slow(struct subchannel_id schid);
 149 void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
 150 void css_clear_subchannel_slow_list(void);
 151 int css_slow_subchannels_exist(void);
 152 extern int need_rescan;
 153
 154 extern struct workqueue_struct *slow_path_wq;
 155 extern struct work_struct slow_path_work;
 156 #endif