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 	char *driver_override; /* Driver name to force a match */
107 } __attribute__ ((aligned(8)));
108 
109 DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
110 
111 #define to_subchannel(n) container_of(n, struct subchannel, dev)
112 
113 extern int cio_enable_subchannel(struct subchannel *, u32);
114 extern int cio_disable_subchannel (struct subchannel *);
115 extern int cio_cancel (struct subchannel *);
116 extern int cio_clear (struct subchannel *);
117 extern int cio_cancel_halt_clear(struct subchannel *, int *);
118 extern int cio_resume (struct subchannel *);
119 extern int cio_halt (struct subchannel *);
120 extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
121 extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
122 extern int cio_set_options (struct subchannel *, int);
123 extern int cio_update_schib(struct subchannel *sch);
124 extern int cio_commit_config(struct subchannel *sch);
125 
126 int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
127 int cio_tm_intrg(struct subchannel *sch);
128 
129 extern int __init airq_init(void);
130 
131 /* Use with care. */
132 #ifdef CONFIG_CCW_CONSOLE
133 extern struct subchannel *cio_probe_console(void);
134 extern int cio_is_console(struct subchannel_id);
135 extern void cio_register_early_subchannels(void);
136 extern void cio_tsch(struct subchannel *sch);
137 #else
138 #define cio_is_console(schid) 0
cio_register_early_subchannels(void)139 static inline void cio_register_early_subchannels(void) {}
140 #endif
141 
142 #endif
143