arch/s390/include/uapi/asm/dasd.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * Copyright IBM Corp. 1999, 2000
   6  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
   7  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
   8  *
   9  * This file is the interface of the DASD device driver, which is exported to user space
  10  * any future changes wrt the API will result in a change of the APIVERSION reported
  11  * to userspace by the DASDAPIVER-ioctl
  12  *
  13  */
  14
  15 #ifndef DASD_H
  16 #define DASD_H
  17 #include <linux/types.h>
  18 #include <linux/ioctl.h>
  19
  20 #define DASD_IOCTL_LETTER 'D'
  21
  22 #define DASD_API_VERSION 6
  23
  24 /*
  25  * struct dasd_information2_t
  26  * represents any data about the device, which is visible to userspace.
  27  *  including foramt and featueres.
  28  */
  29 typedef struct dasd_information2_t {
  30         unsigned int devno;         /* S/390 devno */
  31         unsigned int real_devno;    /* for aliases */
  32         unsigned int schid;         /* S/390 subchannel identifier */
  33         unsigned int cu_type  : 16; /* from SenseID */
  34         unsigned int cu_model :  8; /* from SenseID */
  35         unsigned int dev_type : 16; /* from SenseID */
  36         unsigned int dev_model : 8; /* from SenseID */
  37         unsigned int open_count;
  38         unsigned int req_queue_len;
  39         unsigned int chanq_len;     /* length of chanq */
  40         char type[4];               /* from discipline.name, 'none' for unknown */
  41         unsigned int status;        /* current device level */
  42         unsigned int label_block;   /* where to find the VOLSER */
  43         unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
  44         unsigned int characteristics_size;
  45         unsigned int confdata_size;
  46         char characteristics[64];   /* from read_device_characteristics */
  47         char configuration_data[256]; /* from read_configuration_data */
  48         unsigned int format;          /* format info like formatted/cdl/ldl/... */
  49         unsigned int features;        /* dasd features like 'ro',...            */
  50         unsigned int reserved0;       /* reserved for further use ,...          */
  51         unsigned int reserved1;       /* reserved for further use ,...          */
  52         unsigned int reserved2;       /* reserved for further use ,...          */
  53         unsigned int reserved3;       /* reserved for further use ,...          */
  54         unsigned int reserved4;       /* reserved for further use ,...          */
  55         unsigned int reserved5;       /* reserved for further use ,...          */
  56         unsigned int reserved6;       /* reserved for further use ,...          */
  57         unsigned int reserved7;       /* reserved for further use ,...          */
  58 } dasd_information2_t;
  59
  60 /*
  61  * values to be used for dasd_information_t.format
  62  * 0x00: NOT formatted
  63  * 0x01: Linux disc layout
  64  * 0x02: Common disc layout
  65  */
  66 #define DASD_FORMAT_NONE 0
  67 #define DASD_FORMAT_LDL  1
  68 #define DASD_FORMAT_CDL  2
  69 /*
  70  * values to be used for dasd_information_t.features
  71  * 0x00: default features
  72  * 0x01: readonly (ro)
  73  * 0x02: use diag discipline (diag)
  74  * 0x04: set the device initially online (internal use only)
  75  * 0x08: enable ERP related logging
  76  * 0x10: allow I/O to fail on lost paths
  77  * 0x20: allow I/O to fail when a lock was stolen
  78  * 0x40: give access to raw eckd data
  79  * 0x80: enable discard support
  80  */
  81 #define DASD_FEATURE_DEFAULT         0x00
  82 #define DASD_FEATURE_READONLY        0x01
  83 #define DASD_FEATURE_USEDIAG         0x02
  84 #define DASD_FEATURE_INITIAL_ONLINE  0x04
  85 #define DASD_FEATURE_ERPLOG          0x08
  86 #define DASD_FEATURE_FAILFAST        0x10
  87 #define DASD_FEATURE_FAILONSLCK      0x20
  88 #define DASD_FEATURE_USERAW          0x40
  89 #define DASD_FEATURE_DISCARD         0x80
  90
  91 #define DASD_PARTN_BITS 2
  92
  93 /*
  94  * struct dasd_information_t
  95  * represents any data about the data, which is visible to userspace
  96  */
  97 typedef struct dasd_information_t {
  98         unsigned int devno;         /* S/390 devno */
  99         unsigned int real_devno;    /* for aliases */
 100         unsigned int schid;         /* S/390 subchannel identifier */
 101         unsigned int cu_type  : 16; /* from SenseID */
 102         unsigned int cu_model :  8; /* from SenseID */
 103         unsigned int dev_type : 16; /* from SenseID */
 104         unsigned int dev_model : 8; /* from SenseID */
 105         unsigned int open_count;
 106         unsigned int req_queue_len;
 107         unsigned int chanq_len;     /* length of chanq */
 108         char type[4];               /* from discipline.name, 'none' for unknown */
 109         unsigned int status;        /* current device level */
 110         unsigned int label_block;   /* where to find the VOLSER */
 111         unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
 112         unsigned int characteristics_size;
 113         unsigned int confdata_size;
 114         char characteristics[64];   /* from read_device_characteristics */
 115         char configuration_data[256]; /* from read_configuration_data */
 116 } dasd_information_t;
 117
 118 /*
 119  * Read Subsystem Data - Performance Statistics
 120  */
 121 typedef struct dasd_rssd_perf_stats_t {
 122         unsigned char  invalid:1;
 123         unsigned char  format:3;
 124         unsigned char  data_format:4;
 125         unsigned char  unit_address;
 126         unsigned short device_status;
 127         unsigned int   nr_read_normal;
 128         unsigned int   nr_read_normal_hits;
 129         unsigned int   nr_write_normal;
 130         unsigned int   nr_write_fast_normal_hits;
 131         unsigned int   nr_read_seq;
 132         unsigned int   nr_read_seq_hits;
 133         unsigned int   nr_write_seq;
 134         unsigned int   nr_write_fast_seq_hits;
 135         unsigned int   nr_read_cache;
 136         unsigned int   nr_read_cache_hits;
 137         unsigned int   nr_write_cache;
 138         unsigned int   nr_write_fast_cache_hits;
 139         unsigned int   nr_inhibit_cache;
 140         unsigned int   nr_bybass_cache;
 141         unsigned int   nr_seq_dasd_to_cache;
 142         unsigned int   nr_dasd_to_cache;
 143         unsigned int   nr_cache_to_dasd;
 144         unsigned int   nr_delayed_fast_write;
 145         unsigned int   nr_normal_fast_write;
 146         unsigned int   nr_seq_fast_write;
 147         unsigned int   nr_cache_miss;
 148         unsigned char  status2;
 149         unsigned int   nr_quick_write_promotes;
 150         unsigned char  reserved;
 151         unsigned short ssid;
 152         unsigned char  reseved2[96];
 153 } __attribute__((packed)) dasd_rssd_perf_stats_t;
 154
 155 /*
 156  * struct profile_info_t
 157  * holds the profinling information
 158  */
 159 typedef struct dasd_profile_info_t {
 160         unsigned int dasd_io_reqs;       /* number of requests processed at all */
 161         unsigned int dasd_io_sects;      /* number of sectors processed at all */
 162         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 163         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 164         unsigned int dasd_io_timps[32];  /* histogram of requests's times per sector */
 165         unsigned int dasd_io_time1[32];  /* histogram of time from build to start */
 166         unsigned int dasd_io_time2[32];  /* histogram of time from start to irq */
 167         unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
 168         unsigned int dasd_io_time3[32];  /* histogram of time from irq to end */
 169         unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
 170 } dasd_profile_info_t;
 171
 172 /*
 173  * struct format_data_t
 174  * represents all data necessary to format a dasd
 175  */
 176 typedef struct format_data_t {
 177         unsigned int start_unit; /* from track */
 178         unsigned int stop_unit;  /* to track */
 179         unsigned int blksize;    /* sectorsize */
 180         unsigned int intensity;
 181 } format_data_t;
 182
 183 /*
 184  * values to be used for format_data_t.intensity
 185  * 0/8: normal format
 186  * 1/9: also write record zero
 187  * 3/11: also write home address
 188  * 4/12: invalidate track
 189  */
 190 #define DASD_FMT_INT_FMT_R0 1 /* write record zero */
 191 #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
 192 #define DASD_FMT_INT_INVAL  4 /* invalidate tracks */
 193 #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
 194
 195 /*
 196  * struct format_check_t
 197  * represents all data necessary to evaluate the format of
 198  * different tracks of a dasd
 199  */
 200 typedef struct format_check_t {
 201         /* Input */
 202         struct format_data_t expect;
 203
 204         /* Output */
 205         unsigned int result;            /* Error indication (DASD_FMT_ERR_*) */
 206         unsigned int unit;              /* Track that is in error */
 207         unsigned int rec;               /* Record that is in error */
 208         unsigned int num_records;       /* Records in the track in error */
 209         unsigned int blksize;           /* Blocksize of first record in error */
 210         unsigned int key_length;        /* Key length of first record in error */
 211 } format_check_t;
 212
 213 /* Values returned in format_check_t when a format error is detected: */
 214 /* Too few records were found on a single track */
 215 #define DASD_FMT_ERR_TOO_FEW_RECORDS    1
 216 /* Too many records were found on a single track */
 217 #define DASD_FMT_ERR_TOO_MANY_RECORDS   2
 218 /* Blocksize/data-length of a record was wrong */
 219 #define DASD_FMT_ERR_BLKSIZE            3
 220 /* A record ID is defined by cylinder, head, and record number (CHR). */
 221 /* On mismatch, this error is set */
 222 #define DASD_FMT_ERR_RECORD_ID          4
 223 /* If key-length was != 0 */
 224 #define DASD_FMT_ERR_KEY_LENGTH         5
 225
 226 /*
 227  * struct attrib_data_t
 228  * represents the operation (cache) bits for the device.
 229  * Used in DE to influence caching of the DASD.
 230  */
 231 typedef struct attrib_data_t {
 232         unsigned char operation:3;     /* cache operation mode */
 233         unsigned char reserved:5;      /* cache operation mode */
 234         __u16         nr_cyl;          /* no of cyliners for read ahaed */
 235         __u8          reserved2[29];   /* for future use */
 236 } __attribute__ ((packed)) attrib_data_t;
 237
 238 /* definition of operation (cache) bits within attributes of DE */
 239 #define DASD_NORMAL_CACHE  0x0
 240 #define DASD_BYPASS_CACHE  0x1
 241 #define DASD_INHIBIT_LOAD  0x2
 242 #define DASD_SEQ_ACCESS    0x3
 243 #define DASD_SEQ_PRESTAGE  0x4
 244 #define DASD_REC_ACCESS    0x5
 245
 246 /*
 247  * Perform EMC Symmetrix I/O
 248  */
 249 typedef struct dasd_symmio_parms {
 250         unsigned char reserved[8];      /* compat with older releases */
 251         unsigned long long psf_data;    /* char * cast to u64 */
 252         unsigned long long rssd_result; /* char * cast to u64 */
 253         int psf_data_len;
 254         int rssd_result_len;
 255 } __attribute__ ((packed)) dasd_symmio_parms_t;
 256
 257 /*
 258  * Data returned by Sense Path Group ID (SNID)
 259  */
 260 struct dasd_snid_data {
 261         struct {
 262                 __u8 group:2;
 263                 __u8 reserve:2;
 264                 __u8 mode:1;
 265                 __u8 res:3;
 266         } __attribute__ ((packed)) path_state;
 267         __u8 pgid[11];
 268 } __attribute__ ((packed));
 269
 270 struct dasd_snid_ioctl_data {
 271         struct dasd_snid_data data;
 272         __u8 path_mask;
 273 } __attribute__ ((packed));
 274
 275
 276 /********************************************************************************
 277  * SECTION: Definition of IOCTLs
 278  *
 279  * Here ist how the ioctl-nr should be used:
 280  *    0 -   31   DASD driver itself
 281  *   32 -  239   still open
 282  *  240 -  255   reserved for EMC
 283  *******************************************************************************/
 284
 285 /* Disable the volume (for Linux) */
 286 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
 287 /* Enable the volume (for Linux) */
 288 #define BIODASDENABLE  _IO(DASD_IOCTL_LETTER,1)
 289 /* Issue a reserve/release command, rsp. */
 290 #define BIODASDRSRV    _IO(DASD_IOCTL_LETTER,2) /* reserve */
 291 #define BIODASDRLSE    _IO(DASD_IOCTL_LETTER,3) /* release */
 292 #define BIODASDSLCK    _IO(DASD_IOCTL_LETTER,4) /* steal lock */
 293 /* reset profiling information of a device */
 294 #define BIODASDPRRST   _IO(DASD_IOCTL_LETTER,5)
 295 /* Quiesce IO on device */
 296 #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
 297 /* Resume IO on device */
 298 #define BIODASDRESUME  _IO(DASD_IOCTL_LETTER,7)
 299 /* Abort all I/O on a device */
 300 #define BIODASDABORTIO _IO(DASD_IOCTL_LETTER, 240)
 301 /* Allow I/O on a device */
 302 #define BIODASDALLOWIO _IO(DASD_IOCTL_LETTER, 241)
 303
 304
 305 /* retrieve API version number */
 306 #define DASDAPIVER     _IOR(DASD_IOCTL_LETTER,0,int)
 307 /* Get information on a dasd device */
 308 #define BIODASDINFO    _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
 309 /* retrieve profiling information of a device */
 310 #define BIODASDPRRD    _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
 311 /* Get information on a dasd device (enhanced) */
 312 #define BIODASDINFO2   _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
 313 /* Performance Statistics Read */
 314 #define BIODASDPSRD    _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
 315 /* Get Attributes (cache operations) */
 316 #define BIODASDGATTR   _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
 317
 318
 319 /* #define BIODASDFORMAT  _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
 320 #define BIODASDFMT     _IOW(DASD_IOCTL_LETTER,1,format_data_t)
 321 /* Set Attributes (cache operations) */
 322 #define BIODASDSATTR   _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
 323
 324 /* Get Sense Path Group ID (SNID) data */
 325 #define BIODASDSNID    _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data)
 326 /* Check device format according to format_check_t */
 327 #define BIODASDCHECKFMT _IOWR(DASD_IOCTL_LETTER, 2, format_check_t)
 328
 329 #define BIODASDSYMMIO  _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)
 330
 331 #endif                          /* DASD_H */
 332