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 */
16 struct 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. */
49 struct 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 */
64 struct 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 */
75 enum 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 */
82 struct 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
105 #define to_subchannel(n) container_of(n, struct subchannel, dev)
106
107 extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);
108 extern int cio_enable_subchannel(struct subchannel *, u32);
109 extern int cio_disable_subchannel (struct subchannel *);
110 extern int cio_cancel (struct subchannel *);
111 extern int cio_clear (struct subchannel *);
112 extern int cio_resume (struct subchannel *);
113 extern int cio_halt (struct subchannel *);
114 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
115 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
116 extern int cio_cancel (struct subchannel *);
117 extern int cio_set_options (struct subchannel *, int);
118 extern int cio_update_schib(struct subchannel *sch);
119 extern int cio_commit_config(struct subchannel *sch);
120
121 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
122 int cio_tm_intrg(struct subchannel *sch);
123
124 void do_adapter_IO(u8 isc);
125 void do_IRQ(struct pt_regs *);
126
127 /* Use with care. */
128 #ifdef CONFIG_CCW_CONSOLE
129 extern struct subchannel *cio_probe_console(void);
130 extern int cio_is_console(struct subchannel_id);
131 extern void cio_register_early_subchannels(void);
132 extern void cio_tsch(struct subchannel *sch);
133 #else
134 #define cio_is_console(schid) 0
cio_register_early_subchannels(void)135 static inline void cio_register_early_subchannels(void) {}
136 #endif
137
138 #endif
139