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 #include <asm/schid.h>
13
14 /*
15 * path grouping stuff
16 */
17 #define SPID_FUNC_SINGLE_PATH 0x00
18 #define SPID_FUNC_MULTI_PATH 0x80
19 #define SPID_FUNC_ESTABLISH 0x00
20 #define SPID_FUNC_RESIGN 0x40
21 #define SPID_FUNC_DISBAND 0x20
22
23 #define SNID_STATE1_RESET 0
24 #define SNID_STATE1_UNGROUPED 2
25 #define SNID_STATE1_GROUPED 3
26
27 #define SNID_STATE2_NOT_RESVD 0
28 #define SNID_STATE2_RESVD_ELSE 2
29 #define SNID_STATE2_RESVD_SELF 3
30
31 #define SNID_STATE3_MULTI_PATH 1
32 #define SNID_STATE3_SINGLE_PATH 0
33
34 struct path_state {
35 __u8 state1 : 2; /* path state value 1 */
36 __u8 state2 : 2; /* path state value 2 */
37 __u8 state3 : 1; /* path state value 3 */
38 __u8 resvd : 3; /* reserved */
39 } __attribute__ ((packed));
40
41 struct extended_cssid {
42 u8 version;
43 u8 cssid;
44 } __attribute__ ((packed));
45
46 struct pgid {
47 union {
48 __u8 fc; /* SPID function code */
49 struct path_state ps; /* SNID path state */
50 } __attribute__ ((packed)) inf;
51 union {
52 __u32 cpu_addr : 16; /* CPU address */
53 struct extended_cssid ext_cssid;
54 } __attribute__ ((packed)) pgid_high;
55 __u32 cpu_id : 24; /* CPU identification */
56 __u32 cpu_model : 16; /* CPU model */
57 __u32 tod_high; /* high word TOD clock */
58 } __attribute__ ((packed));
59
60 struct subchannel;
61 struct chp_link;
62 /**
63 * struct css_driver - device driver for subchannels
64 * @owner: owning module
65 * @subchannel_type: subchannel type supported by this driver
66 * @drv: embedded device driver structure
67 * @irq: called on interrupts
68 * @chp_event: called for events affecting a channel path
69 * @sch_event: called for events affecting the subchannel
70 * @probe: function called on probe
71 * @remove: function called on remove
72 * @shutdown: called at device shutdown
73 * @prepare: prepare for pm state transition
74 * @complete: undo work done in @prepare
75 * @freeze: callback for freezing during hibernation snapshotting
76 * @thaw: undo work done in @freeze
77 * @restore: callback for restoring after hibernation
78 * @name: name of the device driver
79 */
80 struct css_driver {
81 struct module *owner;
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 *);
95 const char *name;
96 };
97
98 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
99
100 /*
101 * all css_drivers have the css_bus_type
102 */
103 extern struct bus_type css_bus_type;
104
105 extern int css_driver_register(struct css_driver *);
106 extern void css_driver_unregister(struct css_driver *);
107
108 extern void css_sch_device_unregister(struct subchannel *);
109 extern int css_probe_device(struct subchannel_id);
110 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
111 extern int css_init_done;
112 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
113 int (*fn_unknown)(struct subchannel_id,
114 void *), void *data);
115 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
116 extern void css_reiterate_subchannels(void);
117 void css_update_ssd_info(struct subchannel *sch);
118
119 #define __MAX_SUBCHANNEL 65535
120 #define __MAX_SSID 3
121
122 struct channel_subsystem {
123 u8 cssid;
124 int valid;
125 struct channel_path *chps[__MAX_CHPID + 1];
126 struct device device;
127 struct pgid global_pgid;
128 struct mutex mutex;
129 /* channel measurement related */
130 int cm_enabled;
131 void *cub_addr1;
132 void *cub_addr2;
133 /* for orphaned ccw devices */
134 struct subchannel *pseudo_subchannel;
135 };
136 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
137
138 extern struct bus_type css_bus_type;
139 extern struct channel_subsystem *channel_subsystems[];
140
141 /* Helper functions to build lists for the slow path. */
142 void css_schedule_eval(struct subchannel_id schid);
143 void css_schedule_eval_all(void);
144
145 int sch_is_pseudo_sch(struct subchannel *);
146 struct schib;
147 int css_sch_is_valid(struct schib *);
148
149 extern struct workqueue_struct *slow_path_wq;
150 void css_wait_for_slow_path(void);
151 #endif
152
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