379 lines
8.9 KiB
C
379 lines
8.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common interface for I/O on S/390
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*/
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#ifndef _ASM_S390_CIO_H_
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#define _ASM_S390_CIO_H_
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#include <linux/bitops.h>
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#include <linux/genalloc.h>
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#include <asm/types.h>
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#include <asm/tpi.h>
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#define LPM_ANYPATH 0xff
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#define __MAX_CSSID 0
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#define __MAX_SUBCHANNEL 65535
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#define __MAX_SSID 3
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#include <asm/scsw.h>
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/**
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* struct ccw1 - channel command word
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* @cmd_code: command code
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* @flags: flags, like IDA addressing, etc.
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* @count: byte count
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* @cda: data address
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*
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* The ccw is the basic structure to build channel programs that perform
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* operations with the device or the control unit. Only Format-1 channel
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* command words are supported.
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*/
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struct ccw1 {
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__u8 cmd_code;
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__u8 flags;
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__u16 count;
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__u32 cda;
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} __attribute__ ((packed,aligned(8)));
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/**
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* struct ccw0 - channel command word
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* @cmd_code: command code
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* @cda: data address
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* @flags: flags, like IDA addressing, etc.
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* @reserved: will be ignored
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* @count: byte count
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*
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* The format-0 ccw structure.
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*/
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struct ccw0 {
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__u8 cmd_code;
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__u32 cda : 24;
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__u8 flags;
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__u8 reserved;
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__u16 count;
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} __packed __aligned(8);
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#define CCW_FLAG_DC 0x80
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#define CCW_FLAG_CC 0x40
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#define CCW_FLAG_SLI 0x20
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#define CCW_FLAG_SKIP 0x10
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#define CCW_FLAG_PCI 0x08
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#define CCW_FLAG_IDA 0x04
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#define CCW_FLAG_SUSPEND 0x02
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#define CCW_CMD_READ_IPL 0x02
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#define CCW_CMD_NOOP 0x03
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#define CCW_CMD_BASIC_SENSE 0x04
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#define CCW_CMD_TIC 0x08
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#define CCW_CMD_STLCK 0x14
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#define CCW_CMD_SENSE_PGID 0x34
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#define CCW_CMD_SUSPEND_RECONN 0x5B
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#define CCW_CMD_RDC 0x64
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#define CCW_CMD_RELEASE 0x94
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#define CCW_CMD_SET_PGID 0xAF
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#define CCW_CMD_SENSE_ID 0xE4
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#define CCW_CMD_DCTL 0xF3
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#define SENSE_MAX_COUNT 0x20
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/**
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* struct erw - extended report word
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* @res0: reserved
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* @auth: authorization check
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* @pvrf: path-verification-required flag
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* @cpt: channel-path timeout
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* @fsavf: failing storage address validity flag
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* @cons: concurrent sense
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* @scavf: secondary ccw address validity flag
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* @fsaf: failing storage address format
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* @scnt: sense count, if @cons == %1
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* @res16: reserved
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*/
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struct erw {
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__u32 res0 : 3;
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__u32 auth : 1;
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__u32 pvrf : 1;
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__u32 cpt : 1;
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__u32 fsavf : 1;
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__u32 cons : 1;
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__u32 scavf : 1;
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__u32 fsaf : 1;
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__u32 scnt : 6;
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__u32 res16 : 16;
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} __attribute__ ((packed));
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/**
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* struct erw_eadm - EADM Subchannel extended report word
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* @b: aob error
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* @r: arsb error
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*/
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struct erw_eadm {
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__u32 : 16;
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__u32 b : 1;
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__u32 r : 1;
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__u32 : 14;
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} __packed;
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/**
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* struct sublog - subchannel logout area
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* @res0: reserved
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* @esf: extended status flags
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* @lpum: last path used mask
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* @arep: ancillary report
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* @fvf: field-validity flags
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* @sacc: storage access code
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* @termc: termination code
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* @devsc: device-status check
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* @serr: secondary error
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* @ioerr: i/o-error alert
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* @seqc: sequence code
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*/
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struct sublog {
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__u32 res0 : 1;
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__u32 esf : 7;
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__u32 lpum : 8;
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__u32 arep : 1;
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__u32 fvf : 5;
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__u32 sacc : 2;
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__u32 termc : 2;
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__u32 devsc : 1;
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__u32 serr : 1;
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__u32 ioerr : 1;
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__u32 seqc : 3;
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} __attribute__ ((packed));
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/**
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* struct esw0 - Format 0 Extended Status Word (ESW)
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* @sublog: subchannel logout
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* @erw: extended report word
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* @faddr: failing storage address
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* @saddr: secondary ccw address
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*/
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struct esw0 {
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struct sublog sublog;
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struct erw erw;
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__u32 faddr[2];
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__u32 saddr;
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} __attribute__ ((packed));
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/**
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* struct esw1 - Format 1 Extended Status Word (ESW)
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* @zero0: reserved zeros
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* @lpum: last path used mask
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* @zero16: reserved zeros
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* @erw: extended report word
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* @zeros: three fullwords of zeros
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*/
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struct esw1 {
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__u8 zero0;
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__u8 lpum;
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__u16 zero16;
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struct erw erw;
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__u32 zeros[3];
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} __attribute__ ((packed));
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/**
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* struct esw2 - Format 2 Extended Status Word (ESW)
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* @zero0: reserved zeros
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* @lpum: last path used mask
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* @dcti: device-connect-time interval
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* @erw: extended report word
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* @zeros: three fullwords of zeros
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*/
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struct esw2 {
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__u8 zero0;
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__u8 lpum;
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__u16 dcti;
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struct erw erw;
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__u32 zeros[3];
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} __attribute__ ((packed));
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/**
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* struct esw3 - Format 3 Extended Status Word (ESW)
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* @zero0: reserved zeros
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* @lpum: last path used mask
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* @res: reserved
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* @erw: extended report word
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* @zeros: three fullwords of zeros
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*/
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struct esw3 {
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__u8 zero0;
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__u8 lpum;
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__u16 res;
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struct erw erw;
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__u32 zeros[3];
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} __attribute__ ((packed));
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/**
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* struct esw_eadm - EADM Subchannel Extended Status Word (ESW)
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* @sublog: subchannel logout
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* @erw: extended report word
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*/
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struct esw_eadm {
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__u32 sublog;
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struct erw_eadm erw;
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__u32 : 32;
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__u32 : 32;
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__u32 : 32;
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} __packed;
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/**
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* struct irb - interruption response block
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* @scsw: subchannel status word
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* @esw: extended status word
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* @ecw: extended control word
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*
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* The irb that is handed to the device driver when an interrupt occurs. For
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* solicited interrupts, the common I/O layer already performs checks whether
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* a field is valid; a field not being valid is always passed as %0.
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* If a unit check occurred, @ecw may contain sense data; this is retrieved
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* by the common I/O layer itself if the device doesn't support concurrent
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* sense (so that the device driver never needs to perform basic sense itself).
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* For unsolicited interrupts, the irb is passed as-is (expect for sense data,
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* if applicable).
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*/
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struct irb {
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union scsw scsw;
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union {
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struct esw0 esw0;
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struct esw1 esw1;
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struct esw2 esw2;
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struct esw3 esw3;
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struct esw_eadm eadm;
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} esw;
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__u8 ecw[32];
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} __attribute__ ((packed,aligned(4)));
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/**
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* struct ciw - command information word (CIW) layout
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* @et: entry type
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* @reserved: reserved bits
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* @ct: command type
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* @cmd: command code
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* @count: command count
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*/
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struct ciw {
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__u32 et : 2;
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__u32 reserved : 2;
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__u32 ct : 4;
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__u32 cmd : 8;
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__u32 count : 16;
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} __attribute__ ((packed));
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#define CIW_TYPE_RCD 0x0 /* read configuration data */
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#define CIW_TYPE_SII 0x1 /* set interface identifier */
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#define CIW_TYPE_RNI 0x2 /* read node identifier */
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/*
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* Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands"
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*/
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#define ND_VALIDITY_VALID 0
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#define ND_VALIDITY_OUTDATED 1
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#define ND_VALIDITY_INVALID 2
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struct node_descriptor {
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/* Flags. */
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union {
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struct {
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u32 validity:3;
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u32 reserved:5;
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} __packed;
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u8 byte0;
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} __packed;
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/* Node parameters. */
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u32 params:24;
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/* Node ID. */
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char type[6];
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char model[3];
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char manufacturer[3];
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char plant[2];
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char seq[12];
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u16 tag;
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} __packed;
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/*
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* Flags used as input parameters for do_IO()
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*/
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#define DOIO_ALLOW_SUSPEND 0x0001 /* allow for channel prog. suspend */
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#define DOIO_DENY_PREFETCH 0x0002 /* don't allow for CCW prefetch */
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#define DOIO_SUPPRESS_INTER 0x0004 /* suppress intermediate inter. */
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/* ... for suspended CCWs */
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/* Device or subchannel gone. */
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#define CIO_GONE 0x0001
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/* No path to device. */
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#define CIO_NO_PATH 0x0002
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/* Device has appeared. */
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#define CIO_OPER 0x0004
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/* Sick revalidation of device. */
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#define CIO_REVALIDATE 0x0008
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/* Device did not respond in time. */
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#define CIO_BOXED 0x0010
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/**
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* struct ccw_dev_id - unique identifier for ccw devices
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* @ssid: subchannel set id
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* @devno: device number
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*
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* This structure is not directly based on any hardware structure. The
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* hardware identifies a device by its device number and its subchannel,
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* which is in turn identified by its id. In order to get a unique identifier
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* for ccw devices across subchannel sets, @struct ccw_dev_id has been
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* introduced.
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*/
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struct ccw_dev_id {
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u8 ssid;
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u16 devno;
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};
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/**
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* ccw_dev_id_is_equal() - compare two ccw_dev_ids
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* @dev_id1: a ccw_dev_id
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* @dev_id2: another ccw_dev_id
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* Returns:
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* %1 if the two structures are equal field-by-field,
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* %0 if not.
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* Context:
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* any
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*/
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static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
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struct ccw_dev_id *dev_id2)
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{
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if ((dev_id1->ssid == dev_id2->ssid) &&
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(dev_id1->devno == dev_id2->devno))
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return 1;
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return 0;
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}
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/**
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* pathmask_to_pos() - find the position of the left-most bit in a pathmask
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* @mask: pathmask with at least one bit set
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*/
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static inline u8 pathmask_to_pos(u8 mask)
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{
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return 8 - ffs(mask);
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}
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extern void css_schedule_reprobe(void);
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extern void *cio_dma_zalloc(size_t size);
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extern void cio_dma_free(void *cpu_addr, size_t size);
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extern struct device *cio_get_dma_css_dev(void);
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void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
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size_t size);
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void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size);
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void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev);
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struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages);
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/* Function from drivers/s390/cio/chsc.c */
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int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta);
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int chsc_sstpi(void *page, void *result, size_t size);
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int chsc_stzi(void *page, void *result, size_t size);
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int chsc_sgib(u32 origin);
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int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid);
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#endif
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