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 #include <linux/device.h>
   8 #include <linux/types.h>
   9
  10 #include <asm/cio.h>
  11 #include <asm/chpid.h>
  12
  13 #include "schid.h"
  14
  15 /*
  16  * path grouping stuff
  17  */
  18 #define SPID_FUNC_SINGLE_PATH      0x00
  19 #define SPID_FUNC_MULTI_PATH       0x80
  20 #define SPID_FUNC_ESTABLISH        0x00
  21 #define SPID_FUNC_RESIGN           0x40
  22 #define SPID_FUNC_DISBAND          0x20
  23
  24 #define SNID_STATE1_RESET          0
  25 #define SNID_STATE1_UNGROUPED      2
  26 #define SNID_STATE1_GROUPED        3
  27
  28 #define SNID_STATE2_NOT_RESVD      0
  29 #define SNID_STATE2_RESVD_ELSE     2
  30 #define SNID_STATE2_RESVD_SELF     3
  31
  32 #define SNID_STATE3_MULTI_PATH     1
  33 #define SNID_STATE3_SINGLE_PATH    0
  34
  35 struct path_state {
  36         __u8  state1 : 2;       /* path state value 1 */
  37         __u8  state2 : 2;       /* path state value 2 */
  38         __u8  state3 : 1;       /* path state value 3 */
  39         __u8  resvd  : 3;       /* reserved */
  40 } __attribute__ ((packed));
  41
  42 struct extended_cssid {
  43         u8 version;
  44         u8 cssid;
  45 } __attribute__ ((packed));
  46
  47 struct pgid {
  48         union {
  49                 __u8 fc;        /* SPID function code */
  50                 struct path_state ps;   /* SNID path state */
  51         } __attribute__ ((packed)) inf;
  52         union {
  53                 __u32 cpu_addr  : 16;   /* CPU address */
  54                 struct extended_cssid ext_cssid;
  55         } __attribute__ ((packed)) pgid_high;
  56         __u32 cpu_id    : 24;   /* CPU identification */
  57         __u32 cpu_model : 16;   /* CPU model */
  58         __u32 tod_high;         /* high word TOD clock */
  59 } __attribute__ ((packed));
  60
  61 /*
  62  * A css driver handles all subchannels of one type.
  63  * Currently, we only care about I/O subchannels (type 0), these
  64  * have a ccw_device connected to them.
  65  */
  66 struct subchannel;
  67 struct css_driver {
  68         struct module *owner;
  69         unsigned int subchannel_type;
  70         struct device_driver drv;
  71         void (*irq)(struct subchannel *);
  72         int (*notify)(struct subchannel *, int);
  73         void (*verify)(struct subchannel *);
  74         void (*termination)(struct subchannel *);
  75         int (*probe)(struct subchannel *);
  76         int (*remove)(struct subchannel *);
  77         void (*shutdown)(struct subchannel *);
  78         const char *name;
  79 };
  80
  81 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
  82
  83 /*
  84  * all css_drivers have the css_bus_type
  85  */
  86 extern struct bus_type css_bus_type;
  87
  88 extern int css_driver_register(struct css_driver *);
  89 extern void css_driver_unregister(struct css_driver *);
  90
  91 extern void css_sch_device_unregister(struct subchannel *);
  92 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
  93 extern int css_init_done;
  94 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
  95                                int (*fn_unknown)(struct subchannel_id,
  96                                void *), void *data);
  97 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
  98 extern void css_process_crw(int, int);
  99 extern void css_reiterate_subchannels(void);
 100 void css_update_ssd_info(struct subchannel *sch);
 101
 102 #define __MAX_SUBCHANNEL 65535
 103 #define __MAX_SSID 3
 104
 105 struct channel_subsystem {
 106         u8 cssid;
 107         int valid;
 108         struct channel_path *chps[__MAX_CHPID + 1];
 109         struct device device;
 110         struct pgid global_pgid;
 111         struct mutex mutex;
 112         /* channel measurement related */
 113         int cm_enabled;
 114         void *cub_addr1;
 115         void *cub_addr2;
 116         /* for orphaned ccw devices */
 117         struct subchannel *pseudo_subchannel;
 118 };
 119 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 120
 121 extern struct bus_type css_bus_type;
 122 extern struct channel_subsystem *channel_subsystems[];
 123
 124 /* Some helper functions for disconnected state. */
 125 int device_is_disconnected(struct subchannel *);
 126 void device_set_disconnected(struct subchannel *);
 127 void device_trigger_reprobe(struct subchannel *);
 128
 129 /* Helper functions for vary on/off. */
 130 int device_is_online(struct subchannel *);
 131 void device_kill_io(struct subchannel *);
 132 void device_set_intretry(struct subchannel *sch);
 133 int device_trigger_verify(struct subchannel *sch);
 134
 135 /* Machine check helper function. */
 136 void device_kill_pending_timer(struct subchannel *);
 137
 138 /* Helper functions to build lists for the slow path. */
 139 void css_schedule_eval(struct subchannel_id schid);
 140 void css_schedule_eval_all(void);
 141
 142 int sch_is_pseudo_sch(struct subchannel *);
 143 struct schib;
 144 int css_sch_is_valid(struct schib *);
 145
 146 extern struct workqueue_struct *slow_path_wq;
 147 void css_wait_for_slow_path(void);
 148
 149 extern struct attribute_group *subch_attr_groups[];
 150 #endif