/* * File...........: linux/drivers/s390/block/dasd.c * Author(s)......: Holger Smolinski * Bugreports.to..: * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 * * This file is the interface of the DASD device driver, which is exported to user space * any future changes wrt the API will result in a change of the APIVERSION reported * to userspace by the DASDAPIVER-ioctl * */ #ifndef DASD_H #define DASD_H #include #define DASD_IOCTL_LETTER 'D' #define DASD_API_VERSION 6 /* * struct dasd_information2_t * represents any data about the device, which is visible to userspace. * including foramt and featueres. */ typedef struct dasd_information2_t { unsigned int devno; /* S/390 devno */ unsigned int real_devno; /* for aliases */ unsigned int schid; /* S/390 subchannel identifier */ unsigned int cu_type : 16; /* from SenseID */ unsigned int cu_model : 8; /* from SenseID */ unsigned int dev_type : 16; /* from SenseID */ unsigned int dev_model : 8; /* from SenseID */ unsigned int open_count; unsigned int req_queue_len; unsigned int chanq_len; /* length of chanq */ char type[4]; /* from discipline.name, 'none' for unknown */ unsigned int status; /* current device level */ unsigned int label_block; /* where to find the VOLSER */ unsigned int FBA_layout; /* fixed block size (like AIXVOL) */ unsigned int characteristics_size; unsigned int confdata_size; char characteristics[64]; /* from read_device_characteristics */ char configuration_data[256]; /* from read_configuration_data */ unsigned int format; /* format info like formatted/cdl/ldl/... */ unsigned int features; /* dasd features like 'ro',... */ unsigned int reserved0; /* reserved for further use ,... */ unsigned int reserved1; /* reserved for further use ,... */ unsigned int reserved2; /* reserved for further use ,... */ unsigned int reserved3; /* reserved for further use ,... */ unsigned int reserved4; /* reserved for further use ,... */ unsigned int reserved5; /* reserved for further use ,... */ unsigned int reserved6; /* reserved for further use ,... */ unsigned int reserved7; /* reserved for further use ,... */ } dasd_information2_t; /* * values to be used for dasd_information_t.format * 0x00: NOT formatted * 0x01: Linux disc layout * 0x02: Common disc layout */ #define DASD_FORMAT_NONE 0 #define DASD_FORMAT_LDL 1 #define DASD_FORMAT_CDL 2 /* * values to be used for dasd_information_t.features * 0x00: default features * 0x01: readonly (ro) * 0x02: use diag discipline (diag) * 0x04: set the device initially online (internal use only) * 0x08: enable ERP related logging */ #define DASD_FEATURE_DEFAULT 0x00 #define DASD_FEATURE_READONLY 0x01 #define DASD_FEATURE_USEDIAG 0x02 #define DASD_FEATURE_INITIAL_ONLINE 0x04 #define DASD_FEATURE_ERPLOG 0x08 #define DASD_PARTN_BITS 2 /* * struct dasd_information_t * represents any data about the data, which is visible to userspace */ typedef struct dasd_information_t { unsigned int devno; /* S/390 devno */ unsigned int real_devno; /* for aliases */ unsigned int schid; /* S/390 subchannel identifier */ unsigned int cu_type : 16; /* from SenseID */ unsigned int cu_model : 8; /* from SenseID */ unsigned int dev_type : 16; /* from SenseID */ unsigned int dev_model : 8; /* from SenseID */ unsigned int open_count; unsigned int req_queue_len; unsigned int chanq_len; /* length of chanq */ char type[4]; /* from discipline.name, 'none' for unknown */ unsigned int status; /* current device level */ unsigned int label_block; /* where to find the VOLSER */ unsigned int FBA_layout; /* fixed block size (like AIXVOL) */ unsigned int characteristics_size; unsigned int confdata_size; char characteristics[64]; /* from read_device_characteristics */ char configuration_data[256]; /* from read_configuration_data */ } dasd_information_t; /* * Read Subsystem Data - Perfomance Statistics */ typedef struct dasd_rssd_perf_stats_t { unsigned char invalid:1; unsigned char format:3; unsigned char data_format:4; unsigned char unit_address; unsigned short device_status; unsigned int nr_read_normal; unsigned int nr_read_normal_hits; unsigned int nr_write_normal; unsigned int nr_write_fast_normal_hits; unsigned int nr_read_seq; unsigned int nr_read_seq_hits; unsigned int nr_write_seq; unsigned int nr_write_fast_seq_hits; unsigned int nr_read_cache; unsigned int nr_read_cache_hits; unsigned int nr_write_cache; unsigned int nr_write_fast_cache_hits; unsigned int nr_inhibit_cache; unsigned int nr_bybass_cache; unsigned int nr_seq_dasd_to_cache; unsigned int nr_dasd_to_cache; unsigned int nr_cache_to_dasd; unsigned int nr_delayed_fast_write; unsigned int nr_normal_fast_write; unsigned int nr_seq_fast_write; unsigned int nr_cache_miss; unsigned char status2; unsigned int nr_quick_write_promotes; unsigned char reserved; unsigned short ssid; unsigned char reseved2[96]; } __attribute__((packed)) dasd_rssd_perf_stats_t; /* * struct profile_info_t * holds the profinling information */ typedef struct dasd_profile_info_t { unsigned int dasd_io_reqs; /* number of requests processed at all */ unsigned int dasd_io_sects; /* number of sectors processed at all */ unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ unsigned int dasd_io_times[32]; /* histogram of requests's times */ unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */ unsigned int dasd_io_time1[32]; /* histogram of time from build to start */ unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */ unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */ unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */ unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */ } dasd_profile_info_t; /* * struct format_data_t * represents all data necessary to format a dasd */ typedef struct format_data_t { int start_unit; /* from track */ int stop_unit; /* to track */ int blksize; /* sectorsize */ int intensity; } format_data_t; /* * values to be used for format_data_t.intensity * 0/8: normal format * 1/9: also write record zero * 3/11: also write home address * 4/12: invalidate track */ #define DASD_FMT_INT_FMT_R0 1 /* write record zero */ #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */ #define DASD_FMT_INT_INVAL 4 /* invalidate tracks */ #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */ /* * struct attrib_data_t * represents the operation (cache) bits for the device. * Used in DE to influence caching of the DASD. */ typedef struct attrib_data_t { unsigned char operation:3; /* cache operation mode */ unsigned char reserved:5; /* cache operation mode */ __u16 nr_cyl; /* no of cyliners for read ahaed */ __u8 reserved2[29]; /* for future use */ } __attribute__ ((packed)) attrib_data_t; /* definition of operation (cache) bits within attributes of DE */ #define DASD_NORMAL_CACHE 0x0 #define DASD_BYPASS_CACHE 0x1 #define DASD_INHIBIT_LOAD 0x2 #define DASD_SEQ_ACCESS 0x3 #define DASD_SEQ_PRESTAGE 0x4 #define DASD_REC_ACCESS 0x5 /******************************************************************************** * SECTION: Definition of IOCTLs * * Here ist how the ioctl-nr should be used: * 0 - 31 DASD driver itself * 32 - 239 still open * 240 - 255 reserved for EMC *******************************************************************************/ /* Disable the volume (for Linux) */ #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0) /* Enable the volume (for Linux) */ #define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1) /* Issue a reserve/release command, rsp. */ #define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */ #define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */ #define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */ /* reset profiling information of a device */ #define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5) /* Quiesce IO on device */ #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6) /* Resume IO on device */ #define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7) /* retrieve API version number */ #define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int) /* Get information on a dasd device */ #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t) /* retrieve profiling information of a device */ #define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t) /* Get information on a dasd device (enhanced) */ #define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t) /* Performance Statistics Read */ #define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t) /* Get Attributes (cache operations) */ #define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t) /* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */ #define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t) /* Set Attributes (cache operations) */ #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) #endif /* DASD_H */ /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-indent-level: 4 * c-brace-imaginary-offset: 0 * c-brace-offset: -4 * c-argdecl-indent: 4 * c-label-offset: -4 * c-continued-statement-offset: 4 * c-continued-brace-offset: 0 * indent-tabs-mode: nil * tab-width: 8 * End: */