1#ifndef S390_CIO_H
2#define S390_CIO_H
3
4#include <linux/mutex.h>
5#include <linux/device.h>
6#include <linux/mod_devicetable.h>
7#include <asm/chpid.h>
8#include <asm/cio.h>
9#include <asm/fcx.h>
10#include <asm/schid.h>
11#include "chsc.h"
12
13/*
14 * path management control word
15 */
16struct pmcw {
17	u32 intparm;		/* interruption parameter */
18	u32 qf	 : 1;		/* qdio facility */
19	u32 w	 : 1;
20	u32 isc  : 3;		/* interruption sublass */
21	u32 res5 : 3;		/* reserved zeros */
22	u32 ena  : 1;		/* enabled */
23	u32 lm	 : 2;		/* limit mode */
24	u32 mme  : 2;		/* measurement-mode enable */
25	u32 mp	 : 1;		/* multipath mode */
26	u32 tf	 : 1;		/* timing facility */
27	u32 dnv  : 1;		/* device number valid */
28	u32 dev  : 16;		/* device number */
29	u8  lpm;		/* logical path mask */
30	u8  pnom;		/* path not operational mask */
31	u8  lpum;		/* last path used mask */
32	u8  pim;		/* path installed mask */
33	u16 mbi;		/* measurement-block index */
34	u8  pom;		/* path operational mask */
35	u8  pam;		/* path available mask */
36	u8  chpid[8];		/* CHPID 0-7 (if available) */
37	u32 unused1 : 8;	/* reserved zeros */
38	u32 st	    : 3;	/* subchannel type */
39	u32 unused2 : 18;	/* reserved zeros */
40	u32 mbfc    : 1;	/* measurement block format control */
41	u32 xmwme   : 1;	/* extended measurement word mode enable */
42	u32 csense  : 1;	/* concurrent sense; can be enabled ...*/
43				/*  ... per MSCH, however, if facility */
44				/*  ... is not installed, this results */
45				/*  ... in an operand exception.       */
46} __attribute__ ((packed));
47
48/* Target SCHIB configuration. */
49struct schib_config {
50	u64 mba;
51	u32 intparm;
52	u16 mbi;
53	u32 isc:3;
54	u32 ena:1;
55	u32 mme:2;
56	u32 mp:1;
57	u32 csense:1;
58	u32 mbfc:1;
59} __attribute__ ((packed));
60
61/*
62 * subchannel information block
63 */
64struct schib {
65	struct pmcw pmcw;	 /* path management control word */
66	union scsw scsw;	 /* subchannel status word */
67	__u64 mba;               /* measurement block address */
68	__u8 mda[4];		 /* model dependent area */
69} __attribute__ ((packed,aligned(4)));
70
71/*
72 * When rescheduled, todo's with higher values will overwrite those
73 * with lower values.
74 */
75enum sch_todo {
76	SCH_TODO_NOTHING,
77	SCH_TODO_EVAL,
78	SCH_TODO_UNREG,
79};
80
81/* subchannel data structure used by I/O subroutines */
82struct subchannel {
83	struct subchannel_id schid;
84	spinlock_t *lock;	/* subchannel lock */
85	struct mutex reg_mutex;
86	enum {
87		SUBCHANNEL_TYPE_IO = 0,
88		SUBCHANNEL_TYPE_CHSC = 1,
89		SUBCHANNEL_TYPE_MSG = 2,
90		SUBCHANNEL_TYPE_ADM = 3,
91	} st;			/* subchannel type */
92	__u8 vpm;		/* verified path mask */
93	__u8 lpm;		/* logical path mask */
94	__u8 opm;               /* operational path mask */
95	struct schib schib;	/* subchannel information block */
96	int isc; /* desired interruption subclass */
97	struct chsc_ssd_info ssd_info;	/* subchannel description */
98	struct device dev;	/* entry in device tree */
99	struct css_driver *driver;
100	enum sch_todo todo;
101	struct work_struct todo_work;
102	struct schib_config config;
103} __attribute__ ((aligned(8)));
104
105DECLARE_PER_CPU(struct irb, cio_irb);
106
107#define to_subchannel(n) container_of(n, struct subchannel, dev)
108
109extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
110extern int cio_enable_subchannel(struct subchannel *, u32);
111extern int cio_disable_subchannel (struct subchannel *);
112extern int cio_cancel (struct subchannel *);
113extern int cio_clear (struct subchannel *);
114extern int cio_resume (struct subchannel *);
115extern int cio_halt (struct subchannel *);
116extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
117extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
118extern int cio_cancel (struct subchannel *);
119extern int cio_set_options (struct subchannel *, int);
120extern int cio_update_schib(struct subchannel *sch);
121extern int cio_commit_config(struct subchannel *sch);
122
123int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
124int cio_tm_intrg(struct subchannel *sch);
125
126/* Use with care. */
127#ifdef CONFIG_CCW_CONSOLE
128extern struct subchannel *cio_probe_console(void);
129extern int cio_is_console(struct subchannel_id);
130extern void cio_register_early_subchannels(void);
131extern void cio_tsch(struct subchannel *sch);
132#else
133#define cio_is_console(schid) 0
134static inline void cio_register_early_subchannels(void) {}
135#endif
136
137#endif
138