tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _CSS_H
3#define _CSS_H
4
5#include <linux/mutex.h>
6#include <linux/wait.h>
7#include <linux/workqueue.h>
8#include <linux/device.h>
9#include <linux/types.h>
10
11#include <asm/cio.h>
12#include <asm/chpid.h>
13#include <asm/schid.h>
14
15#include "cio.h"
16
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
37struct 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
44struct extended_cssid {
45 u8 version;
46 u8 cssid;
47} __attribute__ ((packed));
48
49struct pgid {
50 union {
51 __u8 fc; /* SPID function code */
52 struct path_state ps; /* SNID path state */
53 } __attribute__ ((packed)) inf;
54 union {
55 __u32 cpu_addr : 16; /* CPU address */
56 struct extended_cssid ext_cssid;
57 } __attribute__ ((packed)) pgid_high;
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
63struct subchannel;
64struct chp_link;
65/**
66 * struct css_driver - device driver for subchannels
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
75 * @settle: wait for asynchronous work to finish
76 */
77struct css_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 *);
86 int (*settle)(void);
87};
88
89#define to_cssdriver(n) container_of(n, struct css_driver, drv)
90
91extern int css_driver_register(struct css_driver *);
92extern void css_driver_unregister(struct css_driver *);
93
94extern void css_sch_device_unregister(struct subchannel *);
95extern int css_register_subchannel(struct subchannel *);
96extern struct subchannel *css_alloc_subchannel(struct subchannel_id,
97 struct schib *schib);
98extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
99extern int css_init_done;
100extern int max_ssid;
101int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
102 int (*fn_unknown)(struct subchannel_id,
103 void *), void *data);
104extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
105void css_update_ssd_info(struct subchannel *sch);
106
107struct channel_subsystem {
108 u8 cssid;
109 u8 iid;
110 bool id_valid; /* cssid,iid */
111 struct channel_path *chps[__MAX_CHPID + 1];
112 struct device device;
113 struct pgid global_pgid;
114 struct mutex mutex;
115 /* channel measurement related */
116 int cm_enabled;
117 void *cub_addr1;
118 void *cub_addr2;
119 /* for orphaned ccw devices */
120 struct subchannel *pseudo_subchannel;
121};
122#define to_css(dev) container_of(dev, struct channel_subsystem, device)
123
124extern struct channel_subsystem *channel_subsystems[];
125
126/* Dummy helper which needs to change once we support more than one css. */
127static inline struct channel_subsystem *css_by_id(u8 cssid)
128{
129 return channel_subsystems[0];
130}
131
132/* Dummy iterator which needs to change once we support more than one css. */
133#define for_each_css(css) \
134 for ((css) = channel_subsystems[0]; (css); (css) = NULL)
135
136/* Helper functions to build lists for the slow path. */
137void css_schedule_eval(struct subchannel_id schid);
138void css_schedule_eval_all(void);
139void css_schedule_eval_all_unreg(unsigned long delay);
140int css_complete_work(void);
141
142int sch_is_pseudo_sch(struct subchannel *);
143struct schib;
144int css_sch_is_valid(struct schib *);
145
146extern struct workqueue_struct *cio_work_q;
147void css_wait_for_slow_path(void);
148void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
149#endif