Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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
8#include <asm/cio.h>
9
10#include "schid.h"
11
12/*
13 * path grouping stuff
14 */
15#define SPID_FUNC_SINGLE_PATH 0x00
16#define SPID_FUNC_MULTI_PATH 0x80
17#define SPID_FUNC_ESTABLISH 0x00
18#define SPID_FUNC_RESIGN 0x40
19#define SPID_FUNC_DISBAND 0x20
20
21#define SNID_STATE1_RESET 0
22#define SNID_STATE1_UNGROUPED 2
23#define SNID_STATE1_GROUPED 3
24
25#define SNID_STATE2_NOT_RESVD 0
26#define SNID_STATE2_RESVD_ELSE 2
27#define SNID_STATE2_RESVD_SELF 3
28
29#define SNID_STATE3_MULTI_PATH 1
30#define SNID_STATE3_SINGLE_PATH 0
31
32struct path_state {
33 __u8 state1 : 2; /* path state value 1 */
34 __u8 state2 : 2; /* path state value 2 */
35 __u8 state3 : 1; /* path state value 3 */
36 __u8 resvd : 3; /* reserved */
37} __attribute__ ((packed));
38
39struct extended_cssid {
40 u8 version;
41 u8 cssid;
42} __attribute__ ((packed));
43
44struct pgid {
45 union {
46 __u8 fc; /* SPID function code */
47 struct path_state ps; /* SNID path state */
48 } __attribute__ ((packed)) inf;
49 union {
50 __u32 cpu_addr : 16; /* CPU address */
51 struct extended_cssid ext_cssid;
52 } __attribute__ ((packed)) pgid_high;
53 __u32 cpu_id : 24; /* CPU identification */
54 __u32 cpu_model : 16; /* CPU model */
55 __u32 tod_high; /* high word TOD clock */
56} __attribute__ ((packed));
57
58#define MAX_CIWS 8
59
60/*
61 * sense-id response buffer layout
62 */
63struct senseid {
64 /* common part */
65 __u8 reserved; /* always 0x'FF' */
66 __u16 cu_type; /* control unit type */
67 __u8 cu_model; /* control unit model */
68 __u16 dev_type; /* device type */
69 __u8 dev_model; /* device model */
70 __u8 unused; /* padding byte */
71 /* extended part */
72 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
73} __attribute__ ((packed,aligned(4)));
74
75struct ccw_device_private {
76 int state; /* device state */
77 atomic_t onoff;
78 unsigned long registered;
79 __u16 devno; /* device number */
80 __u16 sch_no; /* subchannel number */
81 __u8 ssid; /* subchannel set id */
82 __u8 imask; /* lpm mask for SNID/SID/SPGID */
83 int iretry; /* retry counter SNID/SID/SPGID */
84 struct {
85 unsigned int fast:1; /* post with "channel end" */
86 unsigned int repall:1; /* report every interrupt status */
87 unsigned int pgroup:1; /* do path grouping */
88 unsigned int force:1; /* allow forced online */
89 } __attribute__ ((packed)) options;
90 struct {
91 unsigned int pgid_single:1; /* use single path for Set PGID */
92 unsigned int esid:1; /* Ext. SenseID supported by HW */
93 unsigned int dosense:1; /* delayed SENSE required */
94 unsigned int doverify:1; /* delayed path verification */
95 unsigned int donotify:1; /* call notify function */
96 unsigned int recog_done:1; /* dev. recog. complete */
97 unsigned int fake_irb:1; /* deliver faked irb */
98 } __attribute__((packed)) flags;
99 unsigned long intparm; /* user interruption parameter */
100 struct qdio_irq *qdio_data;
101 struct irb irb; /* device status */
102 struct senseid senseid; /* SenseID info */
103 struct pgid pgid; /* path group ID */
104 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
105 struct work_struct kick_work;
106 wait_queue_head_t wait_q;
107 struct timer_list timer;
108 void *cmb; /* measurement information */
109 struct list_head cmb_list; /* list of measured devices */
110 u64 cmb_start_time; /* clock value of cmb reset */
111 void *cmb_wait; /* deferred cmb enable/disable */
112};
113
114/*
115 * A css driver handles all subchannels of one type.
116 * Currently, we only care about I/O subchannels (type 0), these
117 * have a ccw_device connected to them.
118 */
119struct subchannel;
120struct css_driver {
121 unsigned int subchannel_type;
122 struct device_driver drv;
123 void (*irq)(struct device *);
124 int (*notify)(struct device *, int);
125 void (*verify)(struct device *);
126 void (*termination)(struct device *);
127 int (*probe)(struct subchannel *);
128 int (*remove)(struct subchannel *);
129 void (*shutdown)(struct subchannel *);
130};
131
132/*
133 * all css_drivers have the css_bus_type
134 */
135extern struct bus_type css_bus_type;
136extern struct css_driver io_subchannel_driver;
137
138extern int css_probe_device(struct subchannel_id);
139extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
140extern int css_init_done;
141extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
142
143#define __MAX_SUBCHANNEL 65535
144#define __MAX_SSID 3
145#define __MAX_CHPID 255
146#define __MAX_CSSID 0
147
148struct channel_subsystem {
149 u8 cssid;
150 int valid;
151 struct channel_path *chps[__MAX_CHPID + 1];
152 struct device device;
153 struct pgid global_pgid;
154 struct mutex mutex;
155 /* channel measurement related */
156 int cm_enabled;
157 void *cub_addr1;
158 void *cub_addr2;
159};
160#define to_css(dev) container_of(dev, struct channel_subsystem, device)
161
162extern struct bus_type css_bus_type;
163extern struct channel_subsystem *css[];
164
165/* Some helper functions for disconnected state. */
166int device_is_disconnected(struct subchannel *);
167void device_set_disconnected(struct subchannel *);
168void device_trigger_reprobe(struct subchannel *);
169
170/* Helper functions for vary on/off. */
171int device_is_online(struct subchannel *);
172void device_set_waiting(struct subchannel *);
173
174/* Machine check helper function. */
175void device_kill_pending_timer(struct subchannel *);
176
177/* Helper functions to build lists for the slow path. */
178extern int css_enqueue_subchannel_slow(struct subchannel_id schid);
179void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
180void css_clear_subchannel_slow_list(void);
181int css_slow_subchannels_exist(void);
182extern int need_rescan;
183
184extern struct workqueue_struct *slow_path_wq;
185extern struct work_struct slow_path_work;
186#endif