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
  36 struct 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
  43 struct extended_cssid {
  44         u8 version;
  45         u8 cssid;
  46 } __attribute__ ((packed));
  47
  48 struct 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
  62 struct subchannel;
  63 struct 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  */
  81 struct 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
 100 extern int css_driver_register(struct css_driver *);
 101 extern void css_driver_unregister(struct css_driver *);
 102
 103 extern void css_sch_device_unregister(struct subchannel *);
 104 extern int css_register_subchannel(struct subchannel *);
 105 extern struct subchannel *css_alloc_subchannel(struct subchannel_id);
 106 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
 107 extern int css_init_done;
 108 extern int max_ssid;
 109 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
 110                                int (*fn_unknown)(struct subchannel_id,
 111                                void *), void *data);
 112 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 113 void css_update_ssd_info(struct subchannel *sch);
 114
 115 struct channel_subsystem {
 116         u8 cssid;
 117         int valid;
 118         struct channel_path *chps[__MAX_CHPID + 1];
 119         struct device device;
 120         struct pgid global_pgid;
 121         struct mutex mutex;
 122         /* channel measurement related */
 123         int cm_enabled;
 124         void *cub_addr1;
 125         void *cub_addr2;
 126         /* for orphaned ccw devices */
 127         struct subchannel *pseudo_subchannel;
 128 };
 129 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 130
 131 extern struct channel_subsystem *channel_subsystems[];
 132
 133 /* Helper functions to build lists for the slow path. */
 134 void css_schedule_eval(struct subchannel_id schid);
 135 void css_schedule_eval_all(void);
 136 void css_schedule_eval_all_unreg(unsigned long delay);
 137 int css_complete_work(void);
 138
 139 int sch_is_pseudo_sch(struct subchannel *);
 140 struct schib;
 141 int css_sch_is_valid(struct schib *);
 142
 143 extern struct workqueue_struct *cio_work_q;
 144 void css_wait_for_slow_path(void);
 145 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
 146 #endif