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/*
  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
  34struct 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
  41struct extended_cssid {
  42        u8 version;
  43        u8 cssid;
  44} __attribute__ ((packed));
  45
  46struct 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
  60struct subchannel;
  61struct 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 */
  81struct 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 */
 105extern struct bus_type css_bus_type;
 106
 107extern int css_driver_register(struct css_driver *);
 108extern void css_driver_unregister(struct css_driver *);
 109
 110extern void css_sch_device_unregister(struct subchannel *);
 111extern int css_probe_device(struct subchannel_id);
 112extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
 113extern int css_init_done;
 114extern int max_ssid;
 115int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
 116                               int (*fn_unknown)(struct subchannel_id,
 117                               void *), void *data);
 118extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 119extern void css_reiterate_subchannels(void);
 120void css_update_ssd_info(struct subchannel *sch);
 121
 122#define __MAX_SUBCHANNEL 65535
 123#define __MAX_SSID 3
 124
 125struct 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
 141extern struct bus_type css_bus_type;
 142extern struct channel_subsystem *channel_subsystems[];
 143
 144/* Helper functions to build lists for the slow path. */
 145void css_schedule_eval(struct subchannel_id schid);
 146void css_schedule_eval_all(void);
 147
 148int sch_is_pseudo_sch(struct subchannel *);
 149struct schib;
 150int css_sch_is_valid(struct schib *);
 151
 152extern struct workqueue_struct *slow_path_wq;
 153void css_wait_for_slow_path(void);
 154#endif
 155