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review.trustedfirmware.org / hafnium / third_party / linux.git / 0f672f6c0b52b7b0700b0915c72b540721af4465 / . / drivers / s390 / cio / cio.h
blob: dcdaba689b20cf5592f8249a9cf163fd9f404962 [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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 */
17struct 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). */
50struct tpi_info {
51 struct subchannel_id schid;
52 u32 intparm;
53 u32 adapter_IO:1;
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]54 u32 directed_irq:1;
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]55 u32 isc:3;
56 u32 :27;
57 u32 type:3;
58 u32 :12;
59} __packed __aligned(4);
60
61/* Target SCHIB configuration. */
62struct 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 */
77struct 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 */
88enum 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 */
95struct 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;
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]116 u64 dma_mask;
117 char *driver_override; /* Driver name to force a match */
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]118} __attribute__ ((aligned(8)));
119
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]120DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]121
122#define to_subchannel(n) container_of(n, struct subchannel, dev)
123
124extern int cio_enable_subchannel(struct subchannel *, u32);
125extern int cio_disable_subchannel (struct subchannel *);
126extern int cio_cancel (struct subchannel *);
127extern int cio_clear (struct subchannel *);
128extern int cio_cancel_halt_clear(struct subchannel *, int *);
129extern int cio_resume (struct subchannel *);
130extern int cio_halt (struct subchannel *);
131extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
132extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
133extern int cio_set_options (struct subchannel *, int);
134extern int cio_update_schib(struct subchannel *sch);
135extern int cio_commit_config(struct subchannel *sch);
136
137int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
138int cio_tm_intrg(struct subchannel *sch);
139
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]140extern int __init airq_init(void);
141
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]142/* Use with care. */
143#ifdef CONFIG_CCW_CONSOLE
144extern struct subchannel *cio_probe_console(void);
145extern int cio_is_console(struct subchannel_id);
146extern void cio_register_early_subchannels(void);
147extern void cio_tsch(struct subchannel *sch);
148#else
149#define cio_is_console(schid) 0
150static inline void cio_register_early_subchannels(void) {}
151#endif
152
153#endif