LXR linux/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#include "cio.h"
  15
  16/*
  17 * path grouping stuff
  18 */
  19#define SPID_FUNC_SINGLE_PATH      0x00
  20#define SPID_FUNC_MULTI_PATH       0x80
  21#define SPID_FUNC_ESTABLISH        0x00
  22#define SPID_FUNC_RESIGN           0x40
  23#define SPID_FUNC_DISBAND          0x20
  24
  25#define SNID_STATE1_RESET          0
  26#define SNID_STATE1_UNGROUPED      2
  27#define SNID_STATE1_GROUPED        3
  28
  29#define SNID_STATE2_NOT_RESVD      0
  30#define SNID_STATE2_RESVD_ELSE     2
  31#define SNID_STATE2_RESVD_SELF     3
  32
  33#define SNID_STATE3_MULTI_PATH     1
  34#define SNID_STATE3_SINGLE_PATH    0
  35
  36struct path_state {
  37        __u8  state1 : 2;       /* path state value 1 */
  38        __u8  state2 : 2;       /* path state value 2 */
  39        __u8  state3 : 1;       /* path state value 3 */
  40        __u8  resvd  : 3;       /* reserved */
  41} __attribute__ ((packed));
  42
  43struct extended_cssid {
  44        u8 version;
  45        u8 cssid;
  46} __attribute__ ((packed));
  47
  48struct pgid {
  49        union {
  50                __u8 fc;        /* SPID function code */
  51                struct path_state ps;   /* SNID path state */
  52        } __attribute__ ((packed)) inf;
  53        union {
  54                __u32 cpu_addr  : 16;   /* CPU address */
  55                struct extended_cssid ext_cssid;
  56        } __attribute__ ((packed)) pgid_high;
  57        __u32 cpu_id    : 24;   /* CPU identification */
  58        __u32 cpu_model : 16;   /* CPU model */
  59        __u32 tod_high;         /* high word TOD clock */
  60} __attribute__ ((packed));
  61
  62struct subchannel;
  63struct chp_link;
  64/**
  65 * struct css_driver - device driver for subchannels
  66 * @subchannel_type: subchannel type supported by this driver
  67 * @drv: embedded device driver structure
  68 * @irq: called on interrupts
  69 * @chp_event: called for events affecting a channel path
  70 * @sch_event: called for events affecting the subchannel
  71 * @probe: function called on probe
  72 * @remove: function called on remove
  73 * @shutdown: called at device shutdown
  74 * @prepare: prepare for pm state transition
  75 * @complete: undo work done in @prepare
  76 * @freeze: callback for freezing during hibernation snapshotting
  77 * @thaw: undo work done in @freeze
  78 * @restore: callback for restoring after hibernation
  79 * @settle: wait for asynchronous work to finish
  80 */
  81struct css_driver {
  82        struct css_device_id *subchannel_type;
  83        struct device_driver drv;
  84        void (*irq)(struct subchannel *);
  85        int (*chp_event)(struct subchannel *, struct chp_link *, int);
  86        int (*sch_event)(struct subchannel *, int);
  87        int (*probe)(struct subchannel *);
  88        int (*remove)(struct subchannel *);
  89        void (*shutdown)(struct subchannel *);
  90        int (*prepare) (struct subchannel *);
  91        void (*complete) (struct subchannel *);
  92        int (*freeze)(struct subchannel *);
  93        int (*thaw) (struct subchannel *);
  94        int (*restore)(struct subchannel *);
  95        int (*settle)(void);
  96};
  97
  98#define to_cssdriver(n) container_of(n, struct css_driver, drv)
  99
 100extern int css_driver_register(struct css_driver *);
 101extern void css_driver_unregister(struct css_driver *);
 102
 103extern void css_sch_device_unregister(struct subchannel *);
 104extern int css_register_subchannel(struct subchannel *);
 105extern struct subchannel *css_alloc_subchannel(struct subchannel_id);
 106extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
 107extern int css_init_done;
 108extern int max_ssid;
 109int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
 110                               int (*fn_unknown)(struct subchannel_id,
 111                               void *), void *data);
 112extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 113void css_update_ssd_info(struct subchannel *sch);
 114
 115struct channel_subsystem {
 116        int cssid;
 117        struct channel_path *chps[__MAX_CHPID + 1];
 118        struct device device;
 119        struct pgid global_pgid;
 120        struct mutex mutex;
 121        /* channel measurement related */
 122        int cm_enabled;
 123        void *cub_addr1;
 124        void *cub_addr2;
 125        /* for orphaned ccw devices */
 126        struct subchannel *pseudo_subchannel;
 127};
 128#define to_css(dev) container_of(dev, struct channel_subsystem, device)
 129
 130extern struct channel_subsystem *channel_subsystems[];
 131
 132/* Dummy helper which needs to change once we support more than one css. */
 133static inline struct channel_subsystem *css_by_id(u8 cssid)
 134{
 135        return channel_subsystems[0];
 136}
 137
 138/* Dummy iterator which needs to change once we support more than one css. */
 139#define for_each_css(css)                                               \
 140        for ((css) = channel_subsystems[0]; (css); (css) = NULL)
 141
 142/* Helper functions to build lists for the slow path. */
 143void css_schedule_eval(struct subchannel_id schid);
 144void css_schedule_eval_all(void);
 145void css_schedule_eval_all_unreg(unsigned long delay);
 146int css_complete_work(void);
 147
 148int sch_is_pseudo_sch(struct subchannel *);
 149struct schib;
 150int css_sch_is_valid(struct schib *);
 151
 152extern struct workqueue_struct *cio_work_q;
 153void css_wait_for_slow_path(void);
 154void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
 155#endif
 156