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dasd.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> * Bugreports.to..: <Linux390@de.ibm.com> * Copyright IBM Corp. 1999, 2000 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008 * Author.........: Nigel Hislop <hislop_nigel@emc.com> * * 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 <linux/types.h> #include <linux/ioctl.h> #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 format 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 * 0x100: default features * 0x001: readonly (ro) * 0x002: use diag discipline (diag) * 0x004: set the device initially online (internal use only) * 0x008: enable ERP related logging * 0x010: allow I/O to fail on lost paths * 0x020: allow I/O to fail when a lock was stolen * 0x040: give access to raw eckd data * 0x080: enable discard support * 0x100: enable autodisable for IFCC errors (default) * 0x200: enable requeue of all requests on autoquiesce */ #define DASD_FEATURE_READONLY 0x001 #define DASD_FEATURE_USEDIAG 0x002 #define DASD_FEATURE_INITIAL_ONLINE 0x004 #define DASD_FEATURE_ERPLOG 0x008 #define DASD_FEATURE_FAILFAST 0x010 #define DASD_FEATURE_FAILONSLCK 0x020 #define DASD_FEATURE_USERAW 0x040 #define DASD_FEATURE_DISCARD 0x080 #define DASD_FEATURE_PATH_AUTODISABLE 0x100 #define DASD_FEATURE_REQUEUEQUIESCE 0x200 #define DASD_FEATURE_DEFAULT DASD_FEATURE_PATH_AUTODISABLE #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 - Performance 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 { unsigned int start_unit; /* from track */ unsigned int stop_unit; /* to track */ unsigned int blksize; /* sectorsize */ unsigned int intensity; } format_data_t; /* * struct dasd_copypair_swap_data_t * represents all data necessary to issue a swap of the copy pair relation */ struct dasd_copypair_swap_data_t { char primary[20]; /* BUSID of primary */ char secondary[20]; /* BUSID of secondary */ /* Reserved for future updates. */ __u8 reserved[64]; }; /* * 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 */ #define DASD_FMT_INT_FMT_NOR0 16 /* remove permission to write record zero */ #define DASD_FMT_INT_ESE_FULL 32 /* release space for entire volume */ /* * struct format_check_t * represents all data necessary to evaluate the format of * different tracks of a dasd */ typedef struct format_check_t { /* Input */ struct format_data_t expect; /* Output */ unsigned int result; /* Error indication (DASD_FMT_ERR_*) */ unsigned int unit; /* Track that is in error */ unsigned int rec; /* Record that is in error */ unsigned int num_records; /* Records in the track in error */ unsigned int blksize; /* Blocksize of first record in error */ unsigned int key_length; /* Key length of first record in error */ } format_check_t; /* Values returned in format_check_t when a format error is detected: */ /* Too few records were found on a single track */ #define DASD_FMT_ERR_TOO_FEW_RECORDS 1 /* Too many records were found on a single track */ #define DASD_FMT_ERR_TOO_MANY_RECORDS 2 /* Blocksize/data-length of a record was wrong */ #define DASD_FMT_ERR_BLKSIZE 3 /* A record ID is defined by cylinder, head, and record number (CHR). */ /* On mismatch, this error is set */ #define DASD_FMT_ERR_RECORD_ID 4 /* If key-length was != 0 */ #define DASD_FMT_ERR_KEY_LENGTH 5 /* * 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 /* * Perform EMC Symmetrix I/O */ typedef struct dasd_symmio_parms { unsigned char reserved[8]; /* compat with older releases */ unsigned long long psf_data; /* char * cast to u64 */ unsigned long long rssd_result; /* char * cast to u64 */ int psf_data_len; int rssd_result_len; } __attribute__ ((packed)) dasd_symmio_parms_t; /* * Data returned by Sense Path Group ID (SNID) */ struct dasd_snid_data { struct { __u8 group:2; __u8 reserve:2; __u8 mode:1; __u8 res:3; } __attribute__ ((packed)) path_state; __u8 pgid[11]; } __attribute__ ((packed)); struct dasd_snid_ioctl_data { struct dasd_snid_data data; __u8 path_mask; } __attribute__ ((packed)); /******************************************************************************** * 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) /* Abort all I/O on a device */ #define BIODASDABORTIO _IO(DASD_IOCTL_LETTER, 240) /* Allow I/O on a device */ #define BIODASDALLOWIO _IO(DASD_IOCTL_LETTER, 241) /* 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) /* Release Allocated Space */ #define BIODASDRAS _IOW(DASD_IOCTL_LETTER, 3, format_data_t) /* Swap copy pair relation */ #define BIODASDCOPYPAIRSWAP _IOW(DASD_IOCTL_LETTER, 4, struct dasd_copypair_swap_data_t) /* Get Sense Path Group ID (SNID) data */ #define BIODASDSNID _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data) /* Check device format according to format_check_t */ #define BIODASDCHECKFMT _IOWR(DASD_IOCTL_LETTER, 2, format_check_t) #define BIODASDSYMMIO _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t) #endif /* DASD_H */