drivers/s390/cio/css.h

   1 #ifndef _CSS_H
   2 #define _CSS_H
   3
   4 #include <linux/mutex.h>
   5 #include <linux/wait.h>
   6 #include <linux/workqueue.h>
   7
   8 #include <asm/cio.h>
   9
  10 #include "schid.h"
  11
  12 /*
  13  * path grouping stuff
  14  */
  15 #define SPID_FUNC_SINGLE_PATH      0x00
  16 #define SPID_FUNC_MULTI_PATH       0x80
  17 #define SPID_FUNC_ESTABLISH        0x00
  18 #define SPID_FUNC_RESIGN           0x40
  19 #define SPID_FUNC_DISBAND          0x20
  20
  21 #define SNID_STATE1_RESET          0
  22 #define SNID_STATE1_UNGROUPED      2
  23 #define SNID_STATE1_GROUPED        3
  24
  25 #define SNID_STATE2_NOT_RESVD      0
  26 #define SNID_STATE2_RESVD_ELSE     2
  27 #define SNID_STATE2_RESVD_SELF     3
  28
  29 #define SNID_STATE3_MULTI_PATH     1
  30 #define SNID_STATE3_SINGLE_PATH    0
  31
  32 struct path_state {
  33         __u8  state1 : 2;       /* path state value 1 */
  34         __u8  state2 : 2;       /* path state value 2 */
  35         __u8  state3 : 1;       /* path state value 3 */
  36         __u8  resvd  : 3;       /* reserved */
  37 } __attribute__ ((packed));
  38
  39 struct extended_cssid {
  40         u8 version;
  41         u8 cssid;
  42 } __attribute__ ((packed));
  43
  44 struct pgid {
  45         union {
  46                 __u8 fc;        /* SPID function code */
  47                 struct path_state ps;   /* SNID path state */
  48         } __attribute__ ((packed)) inf;
  49         union {
  50                 __u32 cpu_addr  : 16;   /* CPU address */
  51                 struct extended_cssid ext_cssid;
  52         } __attribute__ ((packed)) pgid_high;
  53         __u32 cpu_id    : 24;   /* CPU identification */
  54         __u32 cpu_model : 16;   /* CPU model */
  55         __u32 tod_high;         /* high word TOD clock */
  56 } __attribute__ ((packed));
  57
  58 #define MAX_CIWS 8
  59
  60 /*
  61  * sense-id response buffer layout
  62  */
  63 struct senseid {
  64         /* common part */
  65         __u8  reserved;         /* always 0x'FF' */
  66         __u16 cu_type;          /* control unit type */
  67         __u8  cu_model;         /* control unit model */
  68         __u16 dev_type;         /* device type */
  69         __u8  dev_model;        /* device model */
  70         __u8  unused;           /* padding byte */
  71         /* extended part */
  72         struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
  73 }  __attribute__ ((packed,aligned(4)));
  74
  75 struct ccw_device_private {
  76         int state;              /* device state */
  77         atomic_t onoff;
  78         unsigned long registered;
  79         struct ccw_dev_id dev_id;       /* device id */
  80         struct subchannel_id schid;     /* subchannel number */
  81         __u8 imask;             /* lpm mask for SNID/SID/SPGID */
  82         int iretry;             /* retry counter SNID/SID/SPGID */
  83         struct {
  84                 unsigned int fast:1;    /* post with "channel end" */
  85                 unsigned int repall:1;  /* report every interrupt status */
  86                 unsigned int pgroup:1;  /* do path grouping */
  87                 unsigned int force:1;   /* allow forced online */
  88         } __attribute__ ((packed)) options;
  89         struct {
  90                 unsigned int pgid_single:1; /* use single path for Set PGID */
  91                 unsigned int esid:1;        /* Ext. SenseID supported by HW */
  92                 unsigned int dosense:1;     /* delayed SENSE required */
  93                 unsigned int doverify:1;    /* delayed path verification */
  94                 unsigned int donotify:1;    /* call notify function */
  95                 unsigned int recog_done:1;  /* dev. recog. complete */
  96                 unsigned int fake_irb:1;    /* deliver faked irb */
  97         } __attribute__((packed)) flags;
  98         unsigned long intparm;  /* user interruption parameter */
  99         struct qdio_irq *qdio_data;
 100         struct irb irb;         /* device status */
 101         struct senseid senseid; /* SenseID info */
 102         struct pgid pgid[8];    /* path group IDs per chpid*/
 103         struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
 104         struct work_struct kick_work;
 105         wait_queue_head_t wait_q;
 106         struct timer_list timer;
 107         void *cmb;                      /* measurement information */
 108         struct list_head cmb_list;      /* list of measured devices */
 109         u64 cmb_start_time;             /* clock value of cmb reset */
 110         void *cmb_wait;                 /* deferred cmb enable/disable */
 111 };
 112
 113 /*
 114  * A css driver handles all subchannels of one type.
 115  * Currently, we only care about I/O subchannels (type 0), these
 116  * have a ccw_device connected to them.
 117  */
 118 struct subchannel;
 119 struct css_driver {
 120         unsigned int subchannel_type;
 121         struct device_driver drv;
 122         void (*irq)(struct device *);
 123         int (*notify)(struct device *, int);
 124         void (*verify)(struct device *);
 125         void (*termination)(struct device *);
 126         int (*probe)(struct subchannel *);
 127         int (*remove)(struct subchannel *);
 128         void (*shutdown)(struct subchannel *);
 129 };
 130
 131 /*
 132  * all css_drivers have the css_bus_type
 133  */
 134 extern struct bus_type css_bus_type;
 135 extern struct css_driver io_subchannel_driver;
 136
 137 extern int css_probe_device(struct subchannel_id);
 138 extern int css_sch_device_register(struct subchannel *);
 139 extern void css_sch_device_unregister(struct subchannel *);
 140 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
 141 extern int css_init_done;
 142 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 143
 144 #define __MAX_SUBCHANNEL 65535
 145 #define __MAX_SSID 3
 146 #define __MAX_CHPID 255
 147 #define __MAX_CSSID 0
 148
 149 struct channel_subsystem {
 150         u8 cssid;
 151         int valid;
 152         struct channel_path *chps[__MAX_CHPID + 1];
 153         struct device device;
 154         struct pgid global_pgid;
 155         struct mutex mutex;
 156         /* channel measurement related */
 157         int cm_enabled;
 158         void *cub_addr1;
 159         void *cub_addr2;
 160 };
 161 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 162
 163 extern struct bus_type css_bus_type;
 164 extern struct channel_subsystem *css[];
 165
 166 /* Some helper functions for disconnected state. */
 167 int device_is_disconnected(struct subchannel *);
 168 void device_set_disconnected(struct subchannel *);
 169 void device_trigger_reprobe(struct subchannel *);
 170
 171 /* Helper functions for vary on/off. */
 172 int device_is_online(struct subchannel *);
 173 void device_kill_io(struct subchannel *);
 174
 175 /* Machine check helper function. */
 176 void device_kill_pending_timer(struct subchannel *);
 177
 178 /* Helper functions to build lists for the slow path. */
 179 extern int css_enqueue_subchannel_slow(struct subchannel_id schid);
 180 void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
 181 void css_clear_subchannel_slow_list(void);
 182 int css_slow_subchannels_exist(void);
 183 extern int need_rescan;
 184
 185 extern struct workqueue_struct *slow_path_wq;
 186 extern struct work_struct slow_path_work;
 187 #endif