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>
11 #include <asm/chpid.h>
12 #include <asm/schid.h>
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
25 #define SNID_STATE1_RESET 0
26 #define SNID_STATE1_UNGROUPED 2
27 #define SNID_STATE1_GROUPED 3
29 #define SNID_STATE2_NOT_RESVD 0
30 #define SNID_STATE2_RESVD_ELSE 2
31 #define SNID_STATE2_RESVD_SELF 3
33 #define SNID_STATE3_MULTI_PATH 1
34 #define SNID_STATE3_SINGLE_PATH 0
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));
43 struct extended_cssid {
46 } __attribute__ ((packed));
50 __u8 fc; /* SPID function code */
51 struct path_state ps; /* SNID path state */
52 } __attribute__ ((packed)) inf;
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));
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
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 *);
98 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
100 extern int css_driver_register(struct css_driver *);
101 extern void css_driver_unregister(struct css_driver *);
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;
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);
115 struct channel_subsystem {
118 struct channel_path *chps[__MAX_CHPID + 1];
119 struct device device;
120 struct pgid global_pgid;
122 /* channel measurement related */
126 /* for orphaned ccw devices */
127 struct subchannel *pseudo_subchannel;
129 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
131 extern struct channel_subsystem *channel_subsystems[];
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);
139 int sch_is_pseudo_sch(struct subchannel *);
141 int css_sch_is_valid(struct schib *);
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);