tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
13#include "schid.h"
14
15/*
16 * path grouping stuff
17 */
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
23
24#define SNID_STATE1_RESET 0
25#define SNID_STATE1_UNGROUPED 2
26#define SNID_STATE1_GROUPED 3
27
28#define SNID_STATE2_NOT_RESVD 0
29#define SNID_STATE2_RESVD_ELSE 2
30#define SNID_STATE2_RESVD_SELF 3
31
32#define SNID_STATE3_MULTI_PATH 1
33#define SNID_STATE3_SINGLE_PATH 0
34
35struct path_state {
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));
41
42struct extended_cssid {
43 u8 version;
44 u8 cssid;
45} __attribute__ ((packed));
46
47struct pgid {
48 union {
49 __u8 fc; /* SPID function code */
50 struct path_state ps; /* SNID path state */
51 } __attribute__ ((packed)) inf;
52 union {
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));
60
61/*
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.
65 */
66struct subchannel;
67struct css_driver {
68 struct module *owner;
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 *);
78 const char *name;
79};
80
81#define to_cssdriver(n) container_of(n, struct css_driver, drv)
82
83/*
84 * all css_drivers have the css_bus_type
85 */
86extern struct bus_type css_bus_type;
87
88extern int css_driver_register(struct css_driver *);
89extern void css_driver_unregister(struct css_driver *);
90
91extern void css_sch_device_unregister(struct subchannel *);
92extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
93extern int css_init_done;
94int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
95 int (*fn_unknown)(struct subchannel_id,
96 void *), void *data);
97extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
98extern void css_process_crw(int, int);
99extern void css_reiterate_subchannels(void);
100void css_update_ssd_info(struct subchannel *sch);
101
102#define __MAX_SUBCHANNEL 65535
103#define __MAX_SSID 3
104
105struct channel_subsystem {
106 u8 cssid;
107 int valid;
108 struct channel_path *chps[__MAX_CHPID + 1];
109 struct device device;
110 struct pgid global_pgid;
111 struct mutex mutex;
112 /* channel measurement related */
113 int cm_enabled;
114 void *cub_addr1;
115 void *cub_addr2;
116 /* for orphaned ccw devices */
117 struct subchannel *pseudo_subchannel;
118};
119#define to_css(dev) container_of(dev, struct channel_subsystem, device)
120
121extern struct bus_type css_bus_type;
122extern struct channel_subsystem *channel_subsystems[];
123
124/* Some helper functions for disconnected state. */
125int device_is_disconnected(struct subchannel *);
126void device_set_disconnected(struct subchannel *);
127void device_trigger_reprobe(struct subchannel *);
128
129/* Helper functions for vary on/off. */
130int device_is_online(struct subchannel *);
131void device_kill_io(struct subchannel *);
132void device_set_intretry(struct subchannel *sch);
133int device_trigger_verify(struct subchannel *sch);
134
135/* Machine check helper function. */
136void device_kill_pending_timer(struct subchannel *);
137
138/* Helper functions to build lists for the slow path. */
139void css_schedule_eval(struct subchannel_id schid);
140void css_schedule_eval_all(void);
141
142int sch_is_pseudo_sch(struct subchannel *);
143struct schib;
144int css_sch_is_valid(struct schib *);
145
146extern struct workqueue_struct *slow_path_wq;
147
148extern struct attribute_group *subch_attr_groups[];
149#endif