drivers/s390/cio/css.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _CSS_H
   3 #define _CSS_H
   4
   5 #include <linux/mutex.h>
   6 #include <linux/wait.h>
   7 #include <linux/workqueue.h>
   8 #include <linux/device.h>
   9 #include <linux/types.h>
  10
  11 #include <asm/cio.h>
  12 #include <asm/chpid.h>
  13 #include <asm/schid.h>
  14
  15 #include "cio.h"
  16
  17 /*
  18  * path grouping stuff
  19  */
  20 #define SPID_FUNC_SINGLE_PATH      0x00
  21 #define SPID_FUNC_MULTI_PATH       0x80
  22 #define SPID_FUNC_ESTABLISH        0x00
  23 #define SPID_FUNC_RESIGN           0x40
  24 #define SPID_FUNC_DISBAND          0x20
  25
  26 #define SNID_STATE1_RESET          0
  27 #define SNID_STATE1_UNGROUPED      2
  28 #define SNID_STATE1_GROUPED        3
  29
  30 #define SNID_STATE2_NOT_RESVD      0
  31 #define SNID_STATE2_RESVD_ELSE     2
  32 #define SNID_STATE2_RESVD_SELF     3
  33
  34 #define SNID_STATE3_MULTI_PATH     1
  35 #define SNID_STATE3_SINGLE_PATH    0
  36
  37 struct path_state {
  38         __u8  state1 : 2;       /* path state value 1 */
  39         __u8  state2 : 2;       /* path state value 2 */
  40         __u8  state3 : 1;       /* path state value 3 */
  41         __u8  resvd  : 3;       /* reserved */
  42 } __attribute__ ((packed));
  43
  44 struct extended_cssid {
  45         u8 version;
  46         u8 cssid;
  47 } __attribute__ ((packed));
  48
  49 struct pgid {
  50         union {
  51                 __u8 fc;        /* SPID function code */
  52                 struct path_state ps;   /* SNID path state */
  53         } __attribute__ ((packed)) inf;
  54         union {
  55                 __u32 cpu_addr  : 16;   /* CPU address */
  56                 struct extended_cssid ext_cssid;
  57         } __attribute__ ((packed)) pgid_high;
  58         __u32 cpu_id    : 24;   /* CPU identification */
  59         __u32 cpu_model : 16;   /* CPU model */
  60         __u32 tod_high;         /* high word TOD clock */
  61 } __attribute__ ((packed));
  62
  63 struct subchannel;
  64 struct chp_link;
  65 /**
  66  * struct css_driver - device driver for subchannels
  67  * @subchannel_type: subchannel type supported by this driver
  68  * @drv: embedded device driver structure
  69  * @irq: called on interrupts
  70  * @chp_event: called for events affecting a channel path
  71  * @sch_event: called for events affecting the subchannel
  72  * @probe: function called on probe
  73  * @remove: function called on remove
  74  * @shutdown: called at device shutdown
  75  * @prepare: prepare for pm state transition
  76  * @complete: undo work done in @prepare
  77  * @freeze: callback for freezing during hibernation snapshotting
  78  * @thaw: undo work done in @freeze
  79  * @restore: callback for restoring after hibernation
  80  * @settle: wait for asynchronous work to finish
  81  */
  82 struct css_driver {
  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         int (*settle)(void);
  97 };
  98
  99 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
 100
 101 extern int css_driver_register(struct css_driver *);
 102 extern void css_driver_unregister(struct css_driver *);
 103
 104 extern void css_sch_device_unregister(struct subchannel *);
 105 extern int css_register_subchannel(struct subchannel *);
 106 extern struct subchannel *css_alloc_subchannel(struct subchannel_id,
 107                                                struct schib *schib);
 108 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
 109 extern int css_init_done;
 110 extern int max_ssid;
 111 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
 112                                int (*fn_unknown)(struct subchannel_id,
 113                                void *), void *data);
 114 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
 115 void css_update_ssd_info(struct subchannel *sch);
 116
 117 struct channel_subsystem {
 118         int cssid;
 119         struct channel_path *chps[__MAX_CHPID + 1];
 120         struct device device;
 121         struct pgid global_pgid;
 122         struct mutex mutex;
 123         /* channel measurement related */
 124         int cm_enabled;
 125         void *cub_addr1;
 126         void *cub_addr2;
 127         /* for orphaned ccw devices */
 128         struct subchannel *pseudo_subchannel;
 129 };
 130 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
 131
 132 extern struct channel_subsystem *channel_subsystems[];
 133
 134 /* Dummy helper which needs to change once we support more than one css. */
 135 static inline struct channel_subsystem *css_by_id(u8 cssid)
 136 {
 137         return channel_subsystems[0];
 138 }
 139
 140 /* Dummy iterator which needs to change once we support more than one css. */
 141 #define for_each_css(css)                                               \
 142         for ((css) = channel_subsystems[0]; (css); (css) = NULL)
 143
 144 /* Helper functions to build lists for the slow path. */
 145 void css_schedule_eval(struct subchannel_id schid);
 146 void css_schedule_eval_all(void);
 147 void css_schedule_eval_all_unreg(unsigned long delay);
 148 int css_complete_work(void);
 149
 150 int sch_is_pseudo_sch(struct subchannel *);
 151 struct schib;
 152 int css_sch_is_valid(struct schib *);
 153
 154 extern struct workqueue_struct *cio_work_q;
 155 void css_wait_for_slow_path(void);
 156 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
 157 #endif