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