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 #define MAX_CIWS 8
  62
  63 /*
  64  * sense-id response buffer layout
  65  */
  66 struct senseid {
  67         /* common part */
  68         __u8  reserved;         /* always 0x'FF' */
  69         __u16 cu_type;          /* control unit type */
  70         __u8  cu_model;         /* control unit model */
  71         __u16 dev_type;         /* device type */
  72         __u8  dev_model;        /* device model */
  73         __u8  unused;           /* padding byte */
  74         /* extended part */
  75         struct ciw ciw[MAX_CIWS];       /* variable # of CIWs */
  76 }  __attribute__ ((packed,aligned(4)));
  77
  78 struct ccw_device_private {
  79         struct ccw_device *cdev;
  80         struct subchannel *sch;
  81         int state;              /* device state */
  82         atomic_t onoff;
  83         unsigned long registered;
  84         struct ccw_dev_id dev_id;       /* device id */
  85         struct subchannel_id schid;     /* subchannel number */
  86         __u8 imask;             /* lpm mask for SNID/SID/SPGID */
  87         int iretry;             /* retry counter SNID/SID/SPGID */
  88         struct {
  89                 unsigned int fast:1;    /* post with "channel end" */
  90                 unsigned int repall:1;  /* report every interrupt status */
  91                 unsigned int pgroup:1;  /* do path grouping */
  92                 unsigned int force:1;   /* allow forced online */
  93         } __attribute__ ((packed)) options;
  94         struct {
  95                 unsigned int pgid_single:1; /* use single path for Set PGID */
  96                 unsigned int esid:1;        /* Ext. SenseID supported by HW */
  97                 unsigned int dosense:1;     /* delayed SENSE required */
  98                 unsigned int doverify:1;    /* delayed path verification */
  99                 unsigned int donotify:1;    /* call notify function */
 100                 unsigned int recog_done:1;  /* dev. recog. complete */
 101                 unsigned int fake_irb:1;    /* deliver faked irb */
 102                 unsigned int intretry:1;    /* retry internal operation */
 103         } __attribute__((packed)) flags;
 104         unsigned long intparm;  /* user interruption parameter */
 105         struct qdio_irq *qdio_data;
 106         struct irb irb;         /* device status */
 107         struct senseid senseid; /* SenseID info */
 108         struct pgid pgid[8];    /* path group IDs per chpid*/
 109         struct ccw1 iccws[2];   /* ccws for SNID/SID/SPGID commands */
 110         struct work_struct kick_work;
 111         wait_queue_head_t wait_q;
 112         struct timer_list timer;
 113         void *cmb;                      /* measurement information */
 114         struct list_head cmb_list;      /* list of measured devices */
 115         u64 cmb_start_time;             /* clock value of cmb reset */
 116         void *cmb_wait;                 /* deferred cmb enable/disable */
 117 };
 118
 119 /*
 120  * A css driver handles all subchannels of one type.
 121  * Currently, we only care about I/O subchannels (type 0), these
 122  * have a ccw_device connected to them.
 123  */
 124 struct subchannel;
 125 struct css_driver {
 126         unsigned int subchannel_type;
 127         struct device_driver drv;
 128         void (*irq)(struct device *);
 129         int (*notify)(struct device *, int);
 130         void (*verify)(struct device *);
 131         void (*termination)(struct device *);
 132         int (*probe)(struct subchannel *);
 133         int (*remove)(struct subchannel *);
 134         void (*shutdown)(struct subchannel *);
 135 };
 136
 137 /*
 138  * all css_drivers have the css_bus_type
 139  */
 140 extern struct bus_type css_bus_type;
 141 extern struct css_driver io_subchannel_driver;
 142
 143 extern int css_probe_device(struct subchannel_id);
 144 extern int css_sch_device_register(struct subchannel *);
 145 extern void css_sch_device_unregister(struct subchannel *);
 146 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
 147 extern int css_init_done;
 148 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 149 extern int css_process_crw(int, int);
 150 extern void css_reiterate_subchannels(void);
 151
 152 #define __MAX_SUBCHANNEL 65535
 153 #define __MAX_SSID 3
 154
 155 struct channel_subsystem {
 156         u8 cssid;
 157         int valid;
 158         struct channel_path *chps[__MAX_CHPID + 1];
 159         struct device device;
 160         struct pgid global_pgid;
 161         struct mutex mutex;
 162         /* channel measurement related */
 163         int cm_enabled;
 164         void *cub_addr1;
 165         void *cub_addr2;
 166         /* for orphaned ccw devices */
 167         struct subchannel *pseudo_subchannel;
 168 };
 169 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 170
 171 extern struct bus_type css_bus_type;
 172 extern struct channel_subsystem *css[];
 173
 174 /* Some helper functions for disconnected state. */
 175 int device_is_disconnected(struct subchannel *);
 176 void device_set_disconnected(struct subchannel *);
 177 void device_trigger_reprobe(struct subchannel *);
 178
 179 /* Helper functions for vary on/off. */
 180 int device_is_online(struct subchannel *);
 181 void device_kill_io(struct subchannel *);
 182 void device_set_intretry(struct subchannel *sch);
 183 int device_trigger_verify(struct subchannel *sch);
 184
 185 /* Machine check helper function. */
 186 void device_kill_pending_timer(struct subchannel *);
 187
 188 /* Helper functions to build lists for the slow path. */
 189 extern int css_enqueue_subchannel_slow(struct subchannel_id schid);
 190 void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
 191 void css_clear_subchannel_slow_list(void);
 192 int css_slow_subchannels_exist(void);
 193 extern int need_rescan;
 194
 195 int sch_is_pseudo_sch(struct subchannel *);
 196
 197 extern struct workqueue_struct *slow_path_wq;
 198 extern struct work_struct slow_path_work;
 199
 200 int subchannel_add_files (struct device *);
 201 extern struct attribute_group *subch_attr_groups[];
 202 #endif