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>
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
24 #define SNID_STATE1_RESET 0
25 #define SNID_STATE1_UNGROUPED 2
26 #define SNID_STATE1_GROUPED 3
28 #define SNID_STATE2_NOT_RESVD 0
29 #define SNID_STATE2_RESVD_ELSE 2
30 #define SNID_STATE2_RESVD_SELF 3
32 #define SNID_STATE3_MULTI_PATH 1
33 #define SNID_STATE3_SINGLE_PATH 0
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));
42 struct extended_cssid {
45 } __attribute__ ((packed));
49 __u8 fc; /* SPID function code */
50 struct path_state ps; /* SNID path state */
51 } __attribute__ ((packed)) inf;
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));
62 * A css driver handles all subchannels of one type.
63 * Currently, we only care about I/O subchannels (type 0), these
64 * have a ccw_device connected to them.
69 unsigned int subchannel_type;
70 struct device_driver drv;
71 void (*irq)(struct subchannel *);
72 int (*notify)(struct subchannel *, int);
73 void (*verify)(struct subchannel *);
74 void (*termination)(struct subchannel *);
75 int (*probe)(struct subchannel *);
76 int (*remove)(struct subchannel *);
77 void (*shutdown)(struct subchannel *);
81 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
84 * all css_drivers have the css_bus_type
86 extern struct bus_type css_bus_type;
88 extern int css_driver_register(struct css_driver *);
89 extern void css_driver_unregister(struct css_driver *);
91 extern void css_sch_device_unregister(struct subchannel *);
92 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
93 extern int css_init_done;
94 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
95 extern void css_process_crw(int, int);
96 extern void css_reiterate_subchannels(void);
97 void css_update_ssd_info(struct subchannel *sch);
99 #define __MAX_SUBCHANNEL 65535
102 struct channel_subsystem {
105 struct channel_path *chps[__MAX_CHPID + 1];
106 struct device device;
107 struct pgid global_pgid;
109 /* channel measurement related */
113 /* for orphaned ccw devices */
114 struct subchannel *pseudo_subchannel;
116 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
118 extern struct bus_type css_bus_type;
119 extern struct channel_subsystem *channel_subsystems[];
121 /* Some helper functions for disconnected state. */
122 int device_is_disconnected(struct subchannel *);
123 void device_set_disconnected(struct subchannel *);
124 void device_trigger_reprobe(struct subchannel *);
126 /* Helper functions for vary on/off. */
127 int device_is_online(struct subchannel *);
128 void device_kill_io(struct subchannel *);
129 void device_set_intretry(struct subchannel *sch);
130 int device_trigger_verify(struct subchannel *sch);
132 /* Machine check helper function. */
133 void device_kill_pending_timer(struct subchannel *);
135 /* Helper functions to build lists for the slow path. */
136 void css_schedule_eval(struct subchannel_id schid);
137 void css_schedule_eval_all(void);
139 int sch_is_pseudo_sch(struct subchannel *);
141 int css_sch_is_valid(struct schib *);
143 extern struct workqueue_struct *slow_path_wq;
145 extern struct attribute_group *subch_attr_groups[];