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 struct subchannel;
  62 struct chp_link;
  63 /**
  64  * struct css_driver - device driver for subchannels
  65  * @owner: owning module
  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  * @name: name of the device driver
  75  */
  76 struct css_driver {
  77         struct module *owner;
  78         struct css_device_id *subchannel_type;
  79         struct device_driver drv;
  80         void (*irq)(struct subchannel *);
  81         int (*chp_event)(struct subchannel *, struct chp_link *, int);
  82         int (*sch_event)(struct subchannel *, int);
  83         int (*probe)(struct subchannel *);
  84         int (*remove)(struct subchannel *);
  85         void (*shutdown)(struct subchannel *);
  86         const char *name;
  87 };
  88
  89 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
  90
  91 /*
  92  * all css_drivers have the css_bus_type
  93  */
  94 extern struct bus_type css_bus_type;
  95
  96 extern int css_driver_register(struct css_driver *);
  97 extern void css_driver_unregister(struct css_driver *);
  98
  99 extern void css_sch_device_unregister(struct subchannel *);
 100 extern int css_probe_device(struct subchannel_id);
 101 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
 102 extern int css_init_done;
 103 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
 104                                int (*fn_unknown)(struct subchannel_id,
 105                                void *), void *data);
 106 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 107 extern void css_reiterate_subchannels(void);
 108 void css_update_ssd_info(struct subchannel *sch);
 109
 110 #define __MAX_SUBCHANNEL 65535
 111 #define __MAX_SSID 3
 112
 113 struct channel_subsystem {
 114         u8 cssid;
 115         int valid;
 116         struct channel_path *chps[__MAX_CHPID + 1];
 117         struct device device;
 118         struct pgid global_pgid;
 119         struct mutex mutex;
 120         /* channel measurement related */
 121         int cm_enabled;
 122         void *cub_addr1;
 123         void *cub_addr2;
 124         /* for orphaned ccw devices */
 125         struct subchannel *pseudo_subchannel;
 126 };
 127 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 128
 129 extern struct bus_type css_bus_type;
 130 extern struct channel_subsystem *channel_subsystems[];
 131
 132 /* Helper functions to build lists for the slow path. */
 133 void css_schedule_eval(struct subchannel_id schid);
 134 void css_schedule_eval_all(void);
 135
 136 int sch_is_pseudo_sch(struct subchannel *);
 137 struct schib;
 138 int css_sch_is_valid(struct schib *);
 139
 140 extern struct workqueue_struct *slow_path_wq;
 141 void css_wait_for_slow_path(void);
 142 #endif