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 /*
  10  * path grouping stuff
  11  */
  12 #define SPID_FUNC_SINGLE_PATH      0x00
  13 #define SPID_FUNC_MULTI_PATH       0x80
  14 #define SPID_FUNC_ESTABLISH        0x00
  15 #define SPID_FUNC_RESIGN           0x40
  16 #define SPID_FUNC_DISBAND          0x20
  17
  18 #define SNID_STATE1_RESET          0
  19 #define SNID_STATE1_UNGROUPED      2
  20 #define SNID_STATE1_GROUPED        3
  21
  22 #define SNID_STATE2_NOT_RESVD      0
  23 #define SNID_STATE2_RESVD_ELSE     2
  24 #define SNID_STATE2_RESVD_SELF     3
  25
  26 #define SNID_STATE3_MULTI_PATH     1
  27 #define SNID_STATE3_SINGLE_PATH    0
  28
  29 struct path_state {
  30         __u8  state1 : 2;       /* path state value 1 */
  31         __u8  state2 : 2;       /* path state value 2 */
  32         __u8  state3 : 1;       /* path state value 3 */
  33         __u8  resvd  : 3;       /* reserved */
  34 } __attribute__ ((packed));
  35
  36 struct pgid {
  37         union {
  38                 __u8 fc;        /* SPID function code */
  39                 struct path_state ps;   /* SNID path state */
  40         } inf;
  41         __u32 cpu_addr  : 16;   /* CPU address */
  42         __u32 cpu_id    : 24;   /* CPU identification */
  43         __u32 cpu_model : 16;   /* CPU model */
  44         __u32 tod_high;         /* high word TOD clock */
  45 } __attribute__ ((packed));
  46
  47 extern struct pgid global_pgid;
  48
  49 #define MAX_CIWS 8
  50
  51 /*
  52  * sense-id response buffer layout
  53  */
  54 struct senseid {
  55         /* common part */
  56         __u8  reserved;         /* always 0x'FF' */
  57         __u16 cu_type;          /* control unit type */
  58         __u8  cu_model;         /* control unit model */
  59         __u16 dev_type;         /* device type */
  60         __u8  dev_model;        /* device model */
  61         __u8  unused;           /* padding byte */
  62         /* extended part */
  63         struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
  64 }  __attribute__ ((packed,aligned(4)));
  65
  66 struct ccw_device_private {
  67         int state;              /* device state */
  68         atomic_t onoff;
  69         unsigned long registered;
  70         __u16 devno;            /* device number */
  71         __u16 irq;              /* subchannel number */
  72         __u8 imask;             /* lpm mask for SNID/SID/SPGID */
  73         int iretry;             /* retry counter SNID/SID/SPGID */
  74         struct {
  75                 unsigned int fast:1;    /* post with "channel end" */
  76                 unsigned int repall:1;  /* report every interrupt status */
  77                 unsigned int pgroup:1;  /* do path grouping */
  78                 unsigned int force:1;   /* allow forced online */
  79         } __attribute__ ((packed)) options;
  80         struct {
  81                 unsigned int pgid_single:1; /* use single path for Set PGID */
  82                 unsigned int esid:1;        /* Ext. SenseID supported by HW */
  83                 unsigned int dosense:1;     /* delayed SENSE required */
  84                 unsigned int doverify:1;    /* delayed path verification */
  85                 unsigned int donotify:1;    /* call notify function */
  86                 unsigned int recog_done:1;  /* dev. recog. complete */
  87                 unsigned int fake_irb:1;    /* deliver faked irb */
  88         } __attribute__((packed)) flags;
  89         unsigned long intparm;  /* user interruption parameter */
  90         struct qdio_irq *qdio_data;
  91         struct irb irb;         /* device status */
  92         struct senseid senseid; /* SenseID info */
  93         struct pgid pgid;       /* path group ID */
  94         struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
  95         struct work_struct kick_work;
  96         wait_queue_head_t wait_q;
  97         struct timer_list timer;
  98         void *cmb;                      /* measurement information */
  99         struct list_head cmb_list;      /* list of measured devices */
 100         u64 cmb_start_time;             /* clock value of cmb reset */
 101         void *cmb_wait;                 /* deferred cmb enable/disable */
 102 };
 103
 104 /*
 105  * A css driver handles all subchannels of one type.
 106  * Currently, we only care about I/O subchannels (type 0), these
 107  * have a ccw_device connected to them.
 108  */
 109 struct css_driver {
 110         unsigned int subchannel_type;
 111         struct device_driver drv;
 112         void (*irq)(struct device *);
 113         int (*notify)(struct device *, int);
 114         void (*verify)(struct device *);
 115         void (*termination)(struct device *);
 116 };
 117
 118 /*
 119  * all css_drivers have the css_bus_type
 120  */
 121 extern struct bus_type css_bus_type;
 122 extern struct css_driver io_subchannel_driver;
 123
 124 int css_probe_device(int irq);
 125 extern struct subchannel * get_subchannel_by_schid(int irq);
 126 extern unsigned int highest_subchannel;
 127 extern int css_init_done;
 128
 129 #define __MAX_SUBCHANNELS 65536
 130
 131 extern struct bus_type css_bus_type;
 132 extern struct device css_bus_device;
 133
 134 /* Some helper functions for disconnected state. */
 135 int device_is_disconnected(struct subchannel *);
 136 void device_set_disconnected(struct subchannel *);
 137 void device_trigger_reprobe(struct subchannel *);
 138
 139 /* Helper functions for vary on/off. */
 140 int device_is_online(struct subchannel *);
 141 void device_set_waiting(struct subchannel *);
 142
 143 /* Machine check helper function. */
 144 void device_kill_pending_timer(struct subchannel *);
 145
 146 /* Helper functions to build lists for the slow path. */
 147 int css_enqueue_subchannel_slow(unsigned long schid);
 148 void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
 149 void css_clear_subchannel_slow_list(void);
 150 int css_slow_subchannels_exist(void);
 151 extern int need_rescan;
 152
 153 extern struct workqueue_struct *slow_path_wq;
 154 extern struct work_struct slow_path_work;
 155 #endif