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Diffstat (limited to 'drivers/s390/cio/css.h')
-rw-r--r--drivers/s390/cio/css.h155
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
new file mode 100644
index 000000000000..2004a6c49388
--- /dev/null
+++ b/drivers/s390/cio/css.h
@@ -0,0 +1,155 @@
1#ifndef _CSS_H
2#define _CSS_H
3
4#include <linux/wait.h>
5#include <linux/workqueue.h>
6
7#include <asm/cio.h>
8
9/*
10 * path grouping stuff
11 */
12#define SPID_FUNC_SINGLE_PATH 0x00
13#define SPID_FUNC_MULTI_PATH 0x80
14#define SPID_FUNC_ESTABLISH 0x00
15#define SPID_FUNC_RESIGN 0x40
16#define SPID_FUNC_DISBAND 0x20
17
18#define SNID_STATE1_RESET 0
19#define SNID_STATE1_UNGROUPED 2
20#define SNID_STATE1_GROUPED 3
21
22#define SNID_STATE2_NOT_RESVD 0
23#define SNID_STATE2_RESVD_ELSE 2
24#define SNID_STATE2_RESVD_SELF 3
25
26#define SNID_STATE3_MULTI_PATH 1
27#define SNID_STATE3_SINGLE_PATH 0
28
29struct path_state {
30 __u8 state1 : 2; /* path state value 1 */
31 __u8 state2 : 2; /* path state value 2 */
32 __u8 state3 : 1; /* path state value 3 */
33 __u8 resvd : 3; /* reserved */
34} __attribute__ ((packed));
35
36struct pgid {
37 union {
38 __u8 fc; /* SPID function code */
39 struct path_state ps; /* SNID path state */
40 } inf;
41 __u32 cpu_addr : 16; /* CPU address */
42 __u32 cpu_id : 24; /* CPU identification */
43 __u32 cpu_model : 16; /* CPU model */
44 __u32 tod_high; /* high word TOD clock */
45} __attribute__ ((packed));
46
47extern struct pgid global_pgid;
48
49#define MAX_CIWS 8
50
51/*
52 * sense-id response buffer layout
53 */
54struct senseid {
55 /* common part */
56 __u8 reserved; /* always 0x'FF' */
57 __u16 cu_type; /* control unit type */
58 __u8 cu_model; /* control unit model */
59 __u16 dev_type; /* device type */
60 __u8 dev_model; /* device model */
61 __u8 unused; /* padding byte */
62 /* extended part */
63 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
64} __attribute__ ((packed,aligned(4)));
65
66struct ccw_device_private {
67 int state; /* device state */
68 atomic_t onoff;
69 unsigned long registered;
70 __u16 devno; /* device number */
71 __u16 irq; /* subchannel number */
72 __u8 imask; /* lpm mask for SNID/SID/SPGID */
73 int iretry; /* retry counter SNID/SID/SPGID */
74 struct {
75 unsigned int fast:1; /* post with "channel end" */
76 unsigned int repall:1; /* report every interrupt status */
77 unsigned int pgroup:1; /* do path grouping */
78 unsigned int force:1; /* allow forced online */
79 } __attribute__ ((packed)) options;
80 struct {
81 unsigned int pgid_single:1; /* use single path for Set PGID */
82 unsigned int esid:1; /* Ext. SenseID supported by HW */
83 unsigned int dosense:1; /* delayed SENSE required */
84 unsigned int doverify:1; /* delayed path verification */
85 unsigned int donotify:1; /* call notify function */
86 unsigned int recog_done:1; /* dev. recog. complete */
87 unsigned int fake_irb:1; /* deliver faked irb */
88 } __attribute__((packed)) flags;
89 unsigned long intparm; /* user interruption parameter */
90 struct qdio_irq *qdio_data;
91 struct irb irb; /* device status */
92 struct senseid senseid; /* SenseID info */
93 struct pgid pgid; /* path group ID */
94 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
95 struct work_struct kick_work;
96 wait_queue_head_t wait_q;
97 struct timer_list timer;
98 void *cmb; /* measurement information */
99 struct list_head cmb_list; /* list of measured devices */
100 u64 cmb_start_time; /* clock value of cmb reset */
101 void *cmb_wait; /* deferred cmb enable/disable */
102};
103
104/*
105 * A css driver handles all subchannels of one type.
106 * Currently, we only care about I/O subchannels (type 0), these
107 * have a ccw_device connected to them.
108 */
109struct css_driver {
110 unsigned int subchannel_type;
111 struct device_driver drv;
112 void (*irq)(struct device *);
113 int (*notify)(struct device *, int);
114 void (*verify)(struct device *);
115 void (*termination)(struct device *);
116};
117
118/*
119 * all css_drivers have the css_bus_type
120 */
121extern struct bus_type css_bus_type;
122extern struct css_driver io_subchannel_driver;
123
124int css_probe_device(int irq);
125extern struct subchannel * get_subchannel_by_schid(int irq);
126extern unsigned int highest_subchannel;
127extern int css_init_done;
128
129#define __MAX_SUBCHANNELS 65536
130
131extern struct bus_type css_bus_type;
132extern struct device css_bus_device;
133
134/* Some helper functions for disconnected state. */
135int device_is_disconnected(struct subchannel *);
136void device_set_disconnected(struct subchannel *);
137void device_trigger_reprobe(struct subchannel *);
138
139/* Helper functions for vary on/off. */
140int device_is_online(struct subchannel *);
141void device_set_waiting(struct subchannel *);
142
143/* Machine check helper function. */
144void device_kill_pending_timer(struct subchannel *);
145
146/* Helper functions to build lists for the slow path. */
147int css_enqueue_subchannel_slow(unsigned long schid);
148void css_walk_subchannel_slow_list(void (*fn)(unsigned long));
149void css_clear_subchannel_slow_list(void);
150int css_slow_subchannels_exist(void);
151extern int need_rescan;
152
153extern struct workqueue_struct *slow_path_wq;
154extern struct work_struct slow_path_work;
155#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 22:06:45 -0500