diff options
Diffstat (limited to 'include/asm-s390/cio.h')
| -rw-r--r-- | include/asm-s390/cio.h | 288 |
1 files changed, 200 insertions, 88 deletions
diff --git a/include/asm-s390/cio.h b/include/asm-s390/cio.h index 1982fb344164..2f08c16e44ad 100644 --- a/include/asm-s390/cio.h +++ b/include/asm-s390/cio.h @@ -15,30 +15,50 @@ #define LPM_ANYPATH 0xff #define __MAX_CSSID 0 -/* - * subchannel status word +/** + * struct scsw - subchannel status word + * @key: subchannel key + * @sctl: suspend control + * @eswf: esw format + * @cc: deferred condition code + * @fmt: format + * @pfch: prefetch + * @isic: initial-status interruption control + * @alcc: adress-limit checking control + * @ssi: supress-suspended interruption + * @zcc: zero condition code + * @ectl: extended control + * @pno: path not operational + * @res: reserved + * @fctl: function control + * @actl: activity control + * @stctl: status control + * @cpa: channel program address + * @dstat: device status + * @cstat: subchannel status + * @count: residual count */ struct scsw { - __u32 key : 4; /* subchannel key */ - __u32 sctl : 1; /* suspend control */ - __u32 eswf : 1; /* ESW format */ - __u32 cc : 2; /* deferred condition code */ - __u32 fmt : 1; /* format */ - __u32 pfch : 1; /* prefetch */ - __u32 isic : 1; /* initial-status interruption control */ - __u32 alcc : 1; /* address-limit checking control */ - __u32 ssi : 1; /* supress-suspended interruption */ - __u32 zcc : 1; /* zero condition code */ - __u32 ectl : 1; /* extended control */ - __u32 pno : 1; /* path not operational */ - __u32 res : 1; /* reserved */ - __u32 fctl : 3; /* function control */ - __u32 actl : 7; /* activity control */ - __u32 stctl : 5; /* status control */ - __u32 cpa; /* channel program address */ - __u32 dstat : 8; /* device status */ - __u32 cstat : 8; /* subchannel status */ - __u32 count : 16; /* residual count */ + __u32 key : 4; + __u32 sctl : 1; + __u32 eswf : 1; + __u32 cc : 2; + __u32 fmt : 1; + __u32 pfch : 1; + __u32 isic : 1; + __u32 alcc : 1; + __u32 ssi : 1; + __u32 zcc : 1; + __u32 ectl : 1; + __u32 pno : 1; + __u32 res : 1; + __u32 fctl : 3; + __u32 actl : 7; + __u32 stctl : 5; + __u32 cpa; + __u32 dstat : 8; + __u32 cstat : 8; + __u32 count : 16; } __attribute__ ((packed)); #define SCSW_FCTL_CLEAR_FUNC 0x1 @@ -110,11 +130,22 @@ struct scsw { #define SNS2_ENV_DATA_PRESENT 0x10 #define SNS2_INPRECISE_END 0x04 +/** + * struct ccw1 - channel command word + * @cmd_code: command code + * @flags: flags, like IDA adressing, etc. + * @count: byte count + * @cda: data address + * + * The ccw is the basic structure to build channel programs that perform + * operations with the device or the control unit. Only Format-1 channel + * command words are supported. + */ struct ccw1 { - __u8 cmd_code; /* command code */ - __u8 flags; /* flags, like IDA addressing, etc. */ - __u16 count; /* byte count */ - __u32 cda; /* data address */ + __u8 cmd_code; + __u8 flags; + __u16 count; + __u32 cda; } __attribute__ ((packed,aligned(8))); #define CCW_FLAG_DC 0x80 @@ -140,102 +171,162 @@ struct ccw1 { #define SENSE_MAX_COUNT 0x20 +/** + * struct erw - extended report word + * @res0: reserved + * @auth: authorization check + * @pvrf: path-verification-required flag + * @cpt: channel-path timeout + * @fsavf: failing storage address validity flag + * @cons: concurrent sense + * @scavf: secondary ccw address validity flag + * @fsaf: failing storage address format + * @scnt: sense count, if @cons == %1 + * @res16: reserved + */ struct erw { - __u32 res0 : 3; /* reserved */ - __u32 auth : 1; /* Authorization check */ - __u32 pvrf : 1; /* path-verification-required flag */ - __u32 cpt : 1; /* channel-path timeout */ - __u32 fsavf : 1; /* Failing storage address validity flag */ - __u32 cons : 1; /* concurrent-sense */ - __u32 scavf : 1; /* Secondary ccw address validity flag */ - __u32 fsaf : 1; /* Failing storage address format */ - __u32 scnt : 6; /* sense count if cons == 1 */ - __u32 res16 : 16; /* reserved */ + __u32 res0 : 3; + __u32 auth : 1; + __u32 pvrf : 1; + __u32 cpt : 1; + __u32 fsavf : 1; + __u32 cons : 1; + __u32 scavf : 1; + __u32 fsaf : 1; + __u32 scnt : 6; + __u32 res16 : 16; } __attribute__ ((packed)); -/* - * subchannel logout area +/** + * struct sublog - subchannel logout area + * @res0: reserved + * @esf: extended status flags + * @lpum: last path used mask + * @arep: ancillary report + * @fvf: field-validity flags + * @sacc: storage access code + * @termc: termination code + * @devsc: device-status check + * @serr: secondary error + * @ioerr: i/o-error alert + * @seqc: sequence code */ struct sublog { - __u32 res0 : 1; /* reserved */ - __u32 esf : 7; /* extended status flags */ - __u32 lpum : 8; /* last path used mask */ - __u32 arep : 1; /* ancillary report */ - __u32 fvf : 5; /* field-validity flags */ - __u32 sacc : 2; /* storage access code */ - __u32 termc : 2; /* termination code */ - __u32 devsc : 1; /* device-status check */ - __u32 serr : 1; /* secondary error */ - __u32 ioerr : 1; /* i/o-error alert */ - __u32 seqc : 3; /* sequence code */ + __u32 res0 : 1; + __u32 esf : 7; + __u32 lpum : 8; + __u32 arep : 1; + __u32 fvf : 5; + __u32 sacc : 2; + __u32 termc : 2; + __u32 devsc : 1; + __u32 serr : 1; + __u32 ioerr : 1; + __u32 seqc : 3; } __attribute__ ((packed)); -/* - * Format 0 Extended Status Word (ESW) +/** + * struct esw0 - Format 0 Extended Status Word (ESW) + * @sublog: subchannel logout + * @erw: extended report word + * @faddr: failing storage address + * @saddr: secondary ccw address */ struct esw0 { - struct sublog sublog; /* subchannel logout */ - struct erw erw; /* extended report word */ - __u32 faddr[2]; /* failing storage address */ - __u32 saddr; /* secondary ccw address */ + struct sublog sublog; + struct erw erw; + __u32 faddr[2]; + __u32 saddr; } __attribute__ ((packed)); -/* - * Format 1 Extended Status Word (ESW) +/** + * struct esw1 - Format 1 Extended Status Word (ESW) + * @zero0: reserved zeros + * @lpum: last path used mask + * @zero16: reserved zeros + * @erw: extended report word + * @zeros: three fullwords of zeros */ struct esw1 { - __u8 zero0; /* reserved zeros */ - __u8 lpum; /* last path used mask */ - __u16 zero16; /* reserved zeros */ - struct erw erw; /* extended report word */ - __u32 zeros[3]; /* 2 fullwords of zeros */ + __u8 zero0; + __u8 lpum; + __u16 zero16; + struct erw erw; + __u32 zeros[3]; } __attribute__ ((packed)); -/* - * Format 2 Extended Status Word (ESW) +/** + * struct esw2 - Format 2 Extended Status Word (ESW) + * @zero0: reserved zeros + * @lpum: last path used mask + * @dcti: device-connect-time interval + * @erw: extended report word + * @zeros: three fullwords of zeros */ struct esw2 { - __u8 zero0; /* reserved zeros */ - __u8 lpum; /* last path used mask */ - __u16 dcti; /* device-connect-time interval */ - struct erw erw; /* extended report word */ - __u32 zeros[3]; /* 2 fullwords of zeros */ + __u8 zero0; + __u8 lpum; + __u16 dcti; + struct erw erw; + __u32 zeros[3]; } __attribute__ ((packed)); -/* - * Format 3 Extended Status Word (ESW) +/** + * struct esw3 - Format 3 Extended Status Word (ESW) + * @zero0: reserved zeros + * @lpum: last path used mask + * @res: reserved + * @erw: extended report word + * @zeros: three fullwords of zeros */ struct esw3 { - __u8 zero0; /* reserved zeros */ - __u8 lpum; /* last path used mask */ - __u16 res; /* reserved */ - struct erw erw; /* extended report word */ - __u32 zeros[3]; /* 2 fullwords of zeros */ + __u8 zero0; + __u8 lpum; + __u16 res; + struct erw erw; + __u32 zeros[3]; } __attribute__ ((packed)); -/* - * interruption response block +/** + * struct irb - interruption response block + * @scsw: subchannel status word + * @esw: extened status word, 4 formats + * @ecw: extended control word + * + * The irb that is handed to the device driver when an interrupt occurs. For + * solicited interrupts, the common I/O layer already performs checks whether + * a field is valid; a field not being valid is always passed as %0. + * If a unit check occured, @ecw may contain sense data; this is retrieved + * by the common I/O layer itself if the device doesn't support concurrent + * sense (so that the device driver never needs to perform basic sene itself). + * For unsolicited interrupts, the irb is passed as-is (expect for sense data, + * if applicable). */ struct irb { - struct scsw scsw; /* subchannel status word */ - union { /* extended status word, 4 formats */ + struct scsw scsw; + union { struct esw0 esw0; struct esw1 esw1; struct esw2 esw2; struct esw3 esw3; } esw; - __u8 ecw[32]; /* extended control word */ + __u8 ecw[32]; } __attribute__ ((packed,aligned(4))); -/* - * command information word (CIW) layout +/** + * struct ciw - command information word (CIW) layout + * @et: entry type + * @reserved: reserved bits + * @ct: command type + * @cmd: command code + * @count: command count */ struct ciw { - __u32 et : 2; /* entry type */ - __u32 reserved : 2; /* reserved */ - __u32 ct : 4; /* command type */ - __u32 cmd : 8; /* command */ - __u32 count : 16; /* coun */ + __u32 et : 2; + __u32 reserved : 2; + __u32 ct : 4; + __u32 cmd : 8; + __u32 count : 16; } __attribute__ ((packed)); #define CIW_TYPE_RCD 0x0 /* read configuration data */ @@ -258,11 +349,32 @@ struct ciw { /* Sick revalidation of device. */ #define CIO_REVALIDATE 0x0008 +/** + * struct ccw_dev_id - unique identifier for ccw devices + * @ssid: subchannel set id + * @devno: device number + * + * This structure is not directly based on any hardware structure. The + * hardware identifies a device by its device number and its subchannel, + * which is in turn identified by its id. In order to get a unique identifier + * for ccw devices across subchannel sets, @struct ccw_dev_id has been + * introduced. + */ struct ccw_dev_id { u8 ssid; u16 devno; }; +/** + * ccw_device_id_is_equal() - compare two ccw_dev_ids + * @dev_id1: a ccw_dev_id + * @dev_id2: another ccw_dev_id + * Returns: + * %1 if the two structures are equal field-by-field, + * %0 if not. + * Context: + * any + */ static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1, struct ccw_dev_id *dev_id2) { |