arch/s390/include/asm/dasd.h

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 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  * 0x20: give access to raw eckd data
  77  */
  78 #define DASD_FEATURE_DEFAULT         0x00
  79 #define DASD_FEATURE_READONLY        0x01
  80 #define DASD_FEATURE_USEDIAG         0x02
  81 #define DASD_FEATURE_INITIAL_ONLINE  0x04
  82 #define DASD_FEATURE_ERPLOG          0x08
  83 #define DASD_FEATURE_FAILFAST        0x10
  84 #define DASD_FEATURE_FAILONSLCK      0x20
  85 #define DASD_FEATURE_USERAW          0x40
  86
  87 #define DASD_PARTN_BITS 2
  88
  89 /*
  90  * struct dasd_information_t
  91  * represents any data about the data, which is visible to userspace
  92  */
  93 typedef struct dasd_information_t {
  94         unsigned int devno;         /* S/390 devno */
  95         unsigned int real_devno;    /* for aliases */
  96         unsigned int schid;         /* S/390 subchannel identifier */
  97         unsigned int cu_type  : 16; /* from SenseID */
  98         unsigned int cu_model :  8; /* from SenseID */
  99         unsigned int dev_type : 16; /* from SenseID */
 100         unsigned int dev_model : 8; /* from SenseID */
 101         unsigned int open_count;
 102         unsigned int req_queue_len;
 103         unsigned int chanq_len;     /* length of chanq */
 104         char type[4];               /* from discipline.name, 'none' for unknown */
 105         unsigned int status;        /* current device level */
 106         unsigned int label_block;   /* where to find the VOLSER */
 107         unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
 108         unsigned int characteristics_size;
 109         unsigned int confdata_size;
 110         char characteristics[64];   /* from read_device_characteristics */
 111         char configuration_data[256]; /* from read_configuration_data */
 112 } dasd_information_t;
 113
 114 /*
 115  * Read Subsystem Data - Performance Statistics
 116  */
 117 typedef struct dasd_rssd_perf_stats_t {
 118         unsigned char  invalid:1;
 119         unsigned char  format:3;
 120         unsigned char  data_format:4;
 121         unsigned char  unit_address;
 122         unsigned short device_status;
 123         unsigned int   nr_read_normal;
 124         unsigned int   nr_read_normal_hits;
 125         unsigned int   nr_write_normal;
 126         unsigned int   nr_write_fast_normal_hits;
 127         unsigned int   nr_read_seq;
 128         unsigned int   nr_read_seq_hits;
 129         unsigned int   nr_write_seq;
 130         unsigned int   nr_write_fast_seq_hits;
 131         unsigned int   nr_read_cache;
 132         unsigned int   nr_read_cache_hits;
 133         unsigned int   nr_write_cache;
 134         unsigned int   nr_write_fast_cache_hits;
 135         unsigned int   nr_inhibit_cache;
 136         unsigned int   nr_bybass_cache;
 137         unsigned int   nr_seq_dasd_to_cache;
 138         unsigned int   nr_dasd_to_cache;
 139         unsigned int   nr_cache_to_dasd;
 140         unsigned int   nr_delayed_fast_write;
 141         unsigned int   nr_normal_fast_write;
 142         unsigned int   nr_seq_fast_write;
 143         unsigned int   nr_cache_miss;
 144         unsigned char  status2;
 145         unsigned int   nr_quick_write_promotes;
 146         unsigned char  reserved;
 147         unsigned short ssid;
 148         unsigned char  reseved2[96];
 149 } __attribute__((packed)) dasd_rssd_perf_stats_t;
 150
 151 /*
 152  * struct profile_info_t
 153  * holds the profinling information
 154  */
 155 typedef struct dasd_profile_info_t {
 156         unsigned int dasd_io_reqs;       /* number of requests processed at all */
 157         unsigned int dasd_io_sects;      /* number of sectors processed at all */
 158         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 159         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 160         unsigned int dasd_io_timps[32];  /* histogram of requests's times per sector */
 161         unsigned int dasd_io_time1[32];  /* histogram of time from build to start */
 162         unsigned int dasd_io_time2[32];  /* histogram of time from start to irq */
 163         unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
 164         unsigned int dasd_io_time3[32];  /* histogram of time from irq to end */
 165         unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
 166 } dasd_profile_info_t;
 167
 168 /*
 169  * struct format_data_t
 170  * represents all data necessary to format a dasd
 171  */
 172 typedef struct format_data_t {
 173         unsigned int start_unit; /* from track */
 174         unsigned int stop_unit;  /* to track */
 175         unsigned int blksize;    /* sectorsize */
 176         unsigned int intensity;
 177 } format_data_t;
 178
 179 /*
 180  * values to be used for format_data_t.intensity
 181  * 0/8: normal format
 182  * 1/9: also write record zero
 183  * 3/11: also write home address
 184  * 4/12: invalidate track
 185  */
 186 #define DASD_FMT_INT_FMT_R0 1 /* write record zero */
 187 #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
 188 #define DASD_FMT_INT_INVAL  4 /* invalidate tracks */
 189 #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
 190
 191
 192 /*
 193  * struct attrib_data_t
 194  * represents the operation (cache) bits for the device.
 195  * Used in DE to influence caching of the DASD.
 196  */
 197 typedef struct attrib_data_t {
 198         unsigned char operation:3;     /* cache operation mode */
 199         unsigned char reserved:5;      /* cache operation mode */
 200         __u16         nr_cyl;          /* no of cyliners for read ahaed */
 201         __u8          reserved2[29];   /* for future use */
 202 } __attribute__ ((packed)) attrib_data_t;
 203
 204 /* definition of operation (cache) bits within attributes of DE */
 205 #define DASD_NORMAL_CACHE  0x0
 206 #define DASD_BYPASS_CACHE  0x1
 207 #define DASD_INHIBIT_LOAD  0x2
 208 #define DASD_SEQ_ACCESS    0x3
 209 #define DASD_SEQ_PRESTAGE  0x4
 210 #define DASD_REC_ACCESS    0x5
 211
 212 /*
 213  * Perform EMC Symmetrix I/O
 214  */
 215 typedef struct dasd_symmio_parms {
 216         unsigned char reserved[8];      /* compat with older releases */
 217         unsigned long long psf_data;    /* char * cast to u64 */
 218         unsigned long long rssd_result; /* char * cast to u64 */
 219         int psf_data_len;
 220         int rssd_result_len;
 221 } __attribute__ ((packed)) dasd_symmio_parms_t;
 222
 223 /*
 224  * Data returned by Sense Path Group ID (SNID)
 225  */
 226 struct dasd_snid_data {
 227         struct {
 228                 __u8 group:2;
 229                 __u8 reserve:2;
 230                 __u8 mode:1;
 231                 __u8 res:3;
 232         } __attribute__ ((packed)) path_state;
 233         __u8 pgid[11];
 234 } __attribute__ ((packed));
 235
 236 struct dasd_snid_ioctl_data {
 237         struct dasd_snid_data data;
 238         __u8 path_mask;
 239 } __attribute__ ((packed));
 240
 241
 242 /********************************************************************************
 243  * SECTION: Definition of IOCTLs
 244  *
 245  * Here ist how the ioctl-nr should be used:
 246  *    0 -   31   DASD driver itself
 247  *   32 -  239   still open
 248  *  240 -  255   reserved for EMC
 249  *******************************************************************************/
 250
 251 /* Disable the volume (for Linux) */
 252 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
 253 /* Enable the volume (for Linux) */
 254 #define BIODASDENABLE  _IO(DASD_IOCTL_LETTER,1)
 255 /* Issue a reserve/release command, rsp. */
 256 #define BIODASDRSRV    _IO(DASD_IOCTL_LETTER,2) /* reserve */
 257 #define BIODASDRLSE    _IO(DASD_IOCTL_LETTER,3) /* release */
 258 #define BIODASDSLCK    _IO(DASD_IOCTL_LETTER,4) /* steal lock */
 259 /* reset profiling information of a device */
 260 #define BIODASDPRRST   _IO(DASD_IOCTL_LETTER,5)
 261 /* Quiesce IO on device */
 262 #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
 263 /* Resume IO on device */
 264 #define BIODASDRESUME  _IO(DASD_IOCTL_LETTER,7)
 265
 266
 267 /* retrieve API version number */
 268 #define DASDAPIVER     _IOR(DASD_IOCTL_LETTER,0,int)
 269 /* Get information on a dasd device */
 270 #define BIODASDINFO    _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
 271 /* retrieve profiling information of a device */
 272 #define BIODASDPRRD    _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
 273 /* Get information on a dasd device (enhanced) */
 274 #define BIODASDINFO2   _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
 275 /* Performance Statistics Read */
 276 #define BIODASDPSRD    _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
 277 /* Get Attributes (cache operations) */
 278 #define BIODASDGATTR   _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
 279
 280
 281 /* #define BIODASDFORMAT  _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
 282 #define BIODASDFMT     _IOW(DASD_IOCTL_LETTER,1,format_data_t)
 283 /* Set Attributes (cache operations) */
 284 #define BIODASDSATTR   _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
 285
 286 /* Get Sense Path Group ID (SNID) data */
 287 #define BIODASDSNID    _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data)
 288
 289 #define BIODASDSYMMIO  _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)
 290
 291 #endif                          /* DASD_H */
 292