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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _CSS_H |
3 | #define _CSS_H | |
4 | ||
495a5b45 | 5 | #include <linux/mutex.h> |
1da177e4 LT |
6 | #include <linux/wait.h> |
7 | #include <linux/workqueue.h> | |
e6b6e10a | 8 | #include <linux/device.h> |
e5854a58 | 9 | #include <linux/types.h> |
1da177e4 LT |
10 | |
11 | #include <asm/cio.h> | |
e5854a58 | 12 | #include <asm/chpid.h> |
9d92a7e1 | 13 | #include <asm/schid.h> |
a8237fc4 | 14 | |
390935ac PO |
15 | #include "cio.h" |
16 | ||
1da177e4 LT |
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 | ||
a28c6944 CH |
44 | struct extended_cssid { |
45 | u8 version; | |
46 | u8 cssid; | |
47 | } __attribute__ ((packed)); | |
48 | ||
1da177e4 LT |
49 | struct pgid { |
50 | union { | |
51 | __u8 fc; /* SPID function code */ | |
52 | struct path_state ps; /* SNID path state */ | |
4ae9538d | 53 | } __attribute__ ((packed)) inf; |
a28c6944 CH |
54 | union { |
55 | __u32 cpu_addr : 16; /* CPU address */ | |
56 | struct extended_cssid ext_cssid; | |
4ae9538d | 57 | } __attribute__ ((packed)) pgid_high; |
1da177e4 LT |
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 | ||
8bbace7e | 63 | struct subchannel; |
99611f87 | 64 | struct chp_link; |
c820de39 CH |
65 | /** |
66 | * struct css_driver - device driver for subchannels | |
c820de39 CH |
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 | |
dcbd16d5 SO |
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 | |
8ea7f559 | 80 | * @settle: wait for asynchronous work to finish |
c820de39 | 81 | */ |
1da177e4 | 82 | struct css_driver { |
f08adc00 | 83 | struct css_device_id *subchannel_type; |
1da177e4 | 84 | struct device_driver drv; |
602b20f2 | 85 | void (*irq)(struct subchannel *); |
99611f87 | 86 | int (*chp_event)(struct subchannel *, struct chp_link *, int); |
c820de39 | 87 | int (*sch_event)(struct subchannel *, int); |
8bbace7e CH |
88 | int (*probe)(struct subchannel *); |
89 | int (*remove)(struct subchannel *); | |
90 | void (*shutdown)(struct subchannel *); | |
dcbd16d5 SO |
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 *); | |
b4c70721 | 96 | int (*settle)(void); |
1da177e4 LT |
97 | }; |
98 | ||
084325d8 CH |
99 | #define to_cssdriver(n) container_of(n, struct css_driver, drv) |
100 | ||
25b7bb58 CH |
101 | extern int css_driver_register(struct css_driver *); |
102 | extern void css_driver_unregister(struct css_driver *); | |
103 | ||
6ab4879a | 104 | extern void css_sch_device_unregister(struct subchannel *); |
14556b33 | 105 | extern int css_register_subchannel(struct subchannel *); |
863fc849 | 106 | extern struct subchannel *css_alloc_subchannel(struct subchannel_id); |
c820de39 | 107 | extern struct subchannel *get_subchannel_by_schid(struct subchannel_id); |
1da177e4 | 108 | extern int css_init_done; |
b0a285d3 | 109 | extern int max_ssid; |
e82a1567 PO |
110 | int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *), |
111 | int (*fn_unknown)(struct subchannel_id, | |
112 | void *), void *data); | |
f97a56fb | 113 | extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *); |
7ad6a249 | 114 | void css_update_ssd_info(struct subchannel *sch); |
1da177e4 | 115 | |
a28c6944 | 116 | struct channel_subsystem { |
e2e0de9b | 117 | int cssid; |
871931c1 | 118 | struct channel_path *chps[__MAX_CHPID + 1]; |
a28c6944 CH |
119 | struct device device; |
120 | struct pgid global_pgid; | |
495a5b45 CH |
121 | struct mutex mutex; |
122 | /* channel measurement related */ | |
123 | int cm_enabled; | |
124 | void *cub_addr1; | |
125 | void *cub_addr2; | |
d7b5a4c9 CH |
126 | /* for orphaned ccw devices */ |
127 | struct subchannel *pseudo_subchannel; | |
a28c6944 CH |
128 | }; |
129 | #define to_css(dev) container_of(dev, struct channel_subsystem, device) | |
1da177e4 | 130 | |
7c9f4e3a | 131 | extern struct channel_subsystem *channel_subsystems[]; |
1da177e4 | 132 | |
98cc43ab SO |
133 | /* Dummy helper which needs to change once we support more than one css. */ |
134 | static inline struct channel_subsystem *css_by_id(u8 cssid) | |
135 | { | |
136 | return channel_subsystems[0]; | |
137 | } | |
138 | ||
139 | /* Dummy iterator which needs to change once we support more than one css. */ | |
140 | #define for_each_css(css) \ | |
141 | for ((css) = channel_subsystems[0]; (css); (css) = NULL) | |
142 | ||
1da177e4 | 143 | /* Helper functions to build lists for the slow path. */ |
83b3370c PO |
144 | void css_schedule_eval(struct subchannel_id schid); |
145 | void css_schedule_eval_all(void); | |
175746eb | 146 | void css_schedule_eval_all_unreg(unsigned long delay); |
0d01bb89 | 147 | int css_complete_work(void); |
1da177e4 | 148 | |
d7b5a4c9 | 149 | int sch_is_pseudo_sch(struct subchannel *); |
b279a4f5 CH |
150 | struct schib; |
151 | int css_sch_is_valid(struct schib *); | |
d7b5a4c9 | 152 | |
be5d3823 | 153 | extern struct workqueue_struct *cio_work_q; |
22806dc1 | 154 | void css_wait_for_slow_path(void); |
390935ac | 155 | void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo); |
1da177e4 | 156 | #endif |