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));
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
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 *);
89 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
92 * all css_drivers have the css_bus_type
94 extern struct bus_type css_bus_type;
96 extern int css_driver_register(struct css_driver *);
97 extern void css_driver_unregister(struct css_driver *);
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);
110 #define __MAX_SUBCHANNEL 65535
113 struct channel_subsystem {
116 struct channel_path *chps[__MAX_CHPID + 1];
117 struct device device;
118 struct pgid global_pgid;
120 /* channel measurement related */
124 /* for orphaned ccw devices */
125 struct subchannel *pseudo_subchannel;
127 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
129 extern struct bus_type css_bus_type;
130 extern struct channel_subsystem *channel_subsystems[];
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);
136 int sch_is_pseudo_sch(struct subchannel *);
138 int css_sch_is_valid(struct schib *);
140 extern struct workqueue_struct *slow_path_wq;
141 void css_wait_for_slow_path(void);