1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef S390_CIO_H
3 #define S390_CIO_H
4
5 #include <linux/mutex.h>
6 #include <linux/device.h>
7 #include <linux/mod_devicetable.h>
8 #include <asm/chpid.h>
9 #include <asm/cio.h>
10 #include <asm/fcx.h>
11 #include <asm/schid.h>
12 #include "chsc.h"
13
14 /*
15 * path management control word
16 */
17 struct pmcw {
18 u32 intparm; /* interruption parameter */
19 u32 qf : 1; /* qdio facility */
20 u32 w : 1;
21 u32 isc : 3; /* interruption sublass */
22 u32 res5 : 3; /* reserved zeros */
23 u32 ena : 1; /* enabled */
24 u32 lm : 2; /* limit mode */
25 u32 mme : 2; /* measurement-mode enable */
26 u32 mp : 1; /* multipath mode */
27 u32 tf : 1; /* timing facility */
28 u32 dnv : 1; /* device number valid */
29 u32 dev : 16; /* device number */
30 u8 lpm; /* logical path mask */
31 u8 pnom; /* path not operational mask */
32 u8 lpum; /* last path used mask */
33 u8 pim; /* path installed mask */
34 u16 mbi; /* measurement-block index */
35 u8 pom; /* path operational mask */
36 u8 pam; /* path available mask */
37 u8 chpid[8]; /* CHPID 0-7 (if available) */
38 u32 unused1 : 8; /* reserved zeros */
39 u32 st : 3; /* subchannel type */
40 u32 unused2 : 18; /* reserved zeros */
41 u32 mbfc : 1; /* measurement block format control */
42 u32 xmwme : 1; /* extended measurement word mode enable */
43 u32 csense : 1; /* concurrent sense; can be enabled ...*/
44 /* ... per MSCH, however, if facility */
45 /* ... is not installed, this results */
46 /* ... in an operand exception. */
47 } __attribute__ ((packed));
48
49 /* I/O-Interruption Code as stored by TEST PENDING INTERRUPTION (TPI). */
50 struct tpi_info {
51 struct subchannel_id schid;
52 u32 intparm;
53 u32 adapter_IO:1;
54 u32 :1;
55 u32 isc:3;
56 u32 :27;
57 u32 type:3;
58 u32 :12;
59 } __packed __aligned(4);
60
61 /* Target SCHIB configuration. */
62 struct schib_config {
63 u64 mba;
64 u32 intparm;
65 u16 mbi;
66 u32 isc:3;
67 u32 ena:1;
68 u32 mme:2;
69 u32 mp:1;
70 u32 csense:1;
71 u32 mbfc:1;
72 } __attribute__ ((packed));
73
74 /*
75 * subchannel information block
76 */
77 struct schib {
78 struct pmcw pmcw; /* path management control word */
79 union scsw scsw; /* subchannel status word */
80 __u64 mba; /* measurement block address */
81 __u8 mda[4]; /* model dependent area */
82 } __attribute__ ((packed,aligned(4)));
83
84 /*
85 * When rescheduled, todo's with higher values will overwrite those
86 * with lower values.
87 */
88 enum sch_todo {
89 SCH_TODO_NOTHING,
90 SCH_TODO_EVAL,
91 SCH_TODO_UNREG,
92 };
93
94 /* subchannel data structure used by I/O subroutines */
95 struct subchannel {
96 struct subchannel_id schid;
97 spinlock_t *lock; /* subchannel lock */
98 struct mutex reg_mutex;
99 enum {
100 SUBCHANNEL_TYPE_IO = 0,
101 SUBCHANNEL_TYPE_CHSC = 1,
102 SUBCHANNEL_TYPE_MSG = 2,
103 SUBCHANNEL_TYPE_ADM = 3,
104 } st; /* subchannel type */
105 __u8 vpm; /* verified path mask */
106 __u8 lpm; /* logical path mask */
107 __u8 opm; /* operational path mask */
108 struct schib schib; /* subchannel information block */
109 int isc; /* desired interruption subclass */
110 struct chsc_ssd_info ssd_info; /* subchannel description */
111 struct device dev; /* entry in device tree */
112 struct css_driver *driver;
113 enum sch_todo todo;
114 struct work_struct todo_work;
115 struct schib_config config;
116 } __attribute__ ((aligned(8)));
117
118 DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
119
120 #define to_subchannel(n) container_of(n, struct subchannel, dev)
121
122 extern int cio_enable_subchannel(struct subchannel *, u32);
123 extern int cio_disable_subchannel (struct subchannel *);
124 extern int cio_cancel (struct subchannel *);
125 extern int cio_clear (struct subchannel *);
126 extern int cio_cancel_halt_clear(struct subchannel *, int *);
127 extern int cio_resume (struct subchannel *);
128 extern int cio_halt (struct subchannel *);
129 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
130 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
131 extern int cio_set_options (struct subchannel *, int);
132 extern int cio_update_schib(struct subchannel *sch);
133 extern int cio_commit_config(struct subchannel *sch);
134
135 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
136 int cio_tm_intrg(struct subchannel *sch);
137
138 /* Use with care. */
139 #ifdef CONFIG_CCW_CONSOLE
140 extern struct subchannel *cio_probe_console(void);
141 extern int cio_is_console(struct subchannel_id);
142 extern void cio_register_early_subchannels(void);
143 extern void cio_tsch(struct subchannel *sch);
144 #else
145 #define cio_is_console(schid) 0
cio_register_early_subchannels(void)146 static inline void cio_register_early_subchannels(void) {}
147 #endif
148
149 #endif
150