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 #include <asm/schid.h>
  13
  14 /*
  15  * path grouping stuff
  16  */
  17 #define SPID_FUNC_SINGLE_PATH      0x00
  18 #define SPID_FUNC_MULTI_PATH       0x80
  19 #define SPID_FUNC_ESTABLISH        0x00
  20 #define SPID_FUNC_RESIGN           0x40
  21 #define SPID_FUNC_DISBAND          0x20
  22
  23 #define SNID_STATE1_RESET          0
  24 #define SNID_STATE1_UNGROUPED      2
  25 #define SNID_STATE1_GROUPED        3
  26
  27 #define SNID_STATE2_NOT_RESVD      0
  28 #define SNID_STATE2_RESVD_ELSE     2
  29 #define SNID_STATE2_RESVD_SELF     3
  30
  31 #define SNID_STATE3_MULTI_PATH     1
  32 #define SNID_STATE3_SINGLE_PATH    0
  33
  34 struct path_state {
  35         __u8  state1 : 2;       /* path state value 1 */
  36         __u8  state2 : 2;       /* path state value 2 */
  37         __u8  state3 : 1;       /* path state value 3 */
  38         __u8  resvd  : 3;       /* reserved */
  39 } __attribute__ ((packed));
  40
  41 struct extended_cssid {
  42         u8 version;
  43         u8 cssid;
  44 } __attribute__ ((packed));
  45
  46 struct pgid {
  47         union {
  48                 __u8 fc;        /* SPID function code */
  49                 struct path_state ps;   /* SNID path state */
  50         } __attribute__ ((packed)) inf;
  51         union {
  52                 __u32 cpu_addr  : 16;   /* CPU address */
  53                 struct extended_cssid ext_cssid;
  54         } __attribute__ ((packed)) pgid_high;
  55         __u32 cpu_id    : 24;   /* CPU identification */
  56         __u32 cpu_model : 16;   /* CPU model */
  57         __u32 tod_high;         /* high word TOD clock */
  58 } __attribute__ ((packed));
  59
  60 struct subchannel;
  61 struct chp_link;
  62 /**
  63  * struct css_driver - device driver for subchannels
  64  * @owner: owning module
  65  * @subchannel_type: subchannel type supported by this driver
  66  * @drv: embedded device driver structure
  67  * @irq: called on interrupts
  68  * @chp_event: called for events affecting a channel path
  69  * @sch_event: called for events affecting the subchannel
  70  * @probe: function called on probe
  71  * @remove: function called on remove
  72  * @shutdown: called at device shutdown
  73  * @prepare: prepare for pm state transition
  74  * @complete: undo work done in @prepare
  75  * @freeze: callback for freezing during hibernation snapshotting
  76  * @thaw: undo work done in @freeze
  77  * @restore: callback for restoring after hibernation
  78  * @settle: wait for asynchronous work to finish
  79  * @name: name of the device driver
  80  */
  81 struct css_driver {
  82         struct module *owner;
  83         struct css_device_id *subchannel_type;
  84         struct device_driver drv;
  85         void (*irq)(struct subchannel *);
  86         int (*chp_event)(struct subchannel *, struct chp_link *, int);
  87         int (*sch_event)(struct subchannel *, int);
  88         int (*probe)(struct subchannel *);
  89         int (*remove)(struct subchannel *);
  90         void (*shutdown)(struct subchannel *);
  91         int (*prepare) (struct subchannel *);
  92         void (*complete) (struct subchannel *);
  93         int (*freeze)(struct subchannel *);
  94         int (*thaw) (struct subchannel *);
  95         int (*restore)(struct subchannel *);
  96         void (*settle)(void);
  97         const char *name;
  98 };
  99
 100 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
 101
 102 /*
 103  * all css_drivers have the css_bus_type
 104  */
 105 extern struct bus_type css_bus_type;
 106
 107 extern int css_driver_register(struct css_driver *);
 108 extern void css_driver_unregister(struct css_driver *);
 109
 110 extern void css_sch_device_unregister(struct subchannel *);
 111 extern int css_probe_device(struct subchannel_id);
 112 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
 113 extern int css_init_done;
 114 extern int max_ssid;
 115 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
 116                                int (*fn_unknown)(struct subchannel_id,
 117                                void *), void *data);
 118 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 119 extern void css_reiterate_subchannels(void);
 120 void css_update_ssd_info(struct subchannel *sch);
 121
 122 #define __MAX_SUBCHANNEL 65535
 123 #define __MAX_SSID 3
 124
 125 struct channel_subsystem {
 126         u8 cssid;
 127         int valid;
 128         struct channel_path *chps[__MAX_CHPID + 1];
 129         struct device device;
 130         struct pgid global_pgid;
 131         struct mutex mutex;
 132         /* channel measurement related */
 133         int cm_enabled;
 134         void *cub_addr1;
 135         void *cub_addr2;
 136         /* for orphaned ccw devices */
 137         struct subchannel *pseudo_subchannel;
 138 };
 139 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 140
 141 extern struct bus_type css_bus_type;
 142 extern struct channel_subsystem *channel_subsystems[];
 143
 144 /* Helper functions to build lists for the slow path. */
 145 void css_schedule_eval(struct subchannel_id schid);
 146 void css_schedule_eval_all(void);
 147
 148 int sch_is_pseudo_sch(struct subchannel *);
 149 struct schib;
 150 int css_sch_is_valid(struct schib *);
 151
 152 extern struct workqueue_struct *slow_path_wq;
 153 void css_wait_for_slow_path(void);
 154 #endif