cio.h

  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 */
 18struct pmcw {
 19	u32 intparm;		/* interruption parameter */
 20	u32 qf	 : 1;		/* qdio facility */
 21	u32 w	 : 1;
 22	u32 isc  : 3;		/* interruption subclass */
 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. */
 51struct 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 */
 66struct 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 */
 77enum 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 */
 84struct 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
113DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
114
115#define to_subchannel(n) container_of(n, struct subchannel, dev)
116
117extern int cio_enable_subchannel(struct subchannel *, u32);
118extern int cio_disable_subchannel (struct subchannel *);
119extern int cio_cancel (struct subchannel *);
120extern int cio_clear (struct subchannel *);
121extern int cio_cancel_halt_clear(struct subchannel *, int *);
122extern int cio_resume (struct subchannel *);
123extern int cio_halt (struct subchannel *);
124extern int cio_start (struct subchannel *, struct ccw1 *, __u8);
125extern int cio_start_key (struct subchannel *, struct ccw1 *, __u8, __u8);
126extern int cio_set_options (struct subchannel *, int);
127extern int cio_update_schib(struct subchannel *sch);
128extern int cio_commit_config(struct subchannel *sch);
129
130int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
131int cio_tm_intrg(struct subchannel *sch);
132
133extern int __init airq_init(void);
134
135/* Use with care. */
136#ifdef CONFIG_CCW_CONSOLE
137extern struct subchannel *cio_probe_console(void);
138extern int cio_is_console(struct subchannel_id);
139extern void cio_register_early_subchannels(void);
140extern void cio_tsch(struct subchannel *sch);
141#else
142#define cio_is_console(schid) 0
143static inline void cio_register_early_subchannels(void) {}
144#endif
145
146#endif