include/asm-s390/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  *
   7  * This file is the interface of the DASD device driver, which is exported to user space
   8  * any future changes wrt the API will result in a change of the APIVERSION reported
   9  * to userspace by the DASDAPIVER-ioctl
  10  *
  11  * $Revision: 1.6 $
  12  *
  13  */
  14
  15 #ifndef DASD_H
  16 #define DASD_H
  17 #include <linux/ioctl.h>
  18
  19 #define DASD_IOCTL_LETTER 'D'
  20
  21 #define DASD_API_VERSION 6
  22
  23 /*
  24  * struct dasd_information2_t
  25  * represents any data about the device, which is visible to userspace.
  26  *  including foramt and featueres.
  27  */
  28 typedef struct dasd_information2_t {
  29         unsigned int devno;         /* S/390 devno */
  30         unsigned int real_devno;    /* for aliases */
  31         unsigned int schid;         /* S/390 subchannel identifier */
  32         unsigned int cu_type  : 16; /* from SenseID */
  33         unsigned int cu_model :  8; /* from SenseID */
  34         unsigned int dev_type : 16; /* from SenseID */
  35         unsigned int dev_model : 8; /* from SenseID */
  36         unsigned int open_count;
  37         unsigned int req_queue_len;
  38         unsigned int chanq_len;     /* length of chanq */
  39         char type[4];               /* from discipline.name, 'none' for unknown */
  40         unsigned int status;        /* current device level */
  41         unsigned int label_block;   /* where to find the VOLSER */
  42         unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
  43         unsigned int characteristics_size;
  44         unsigned int confdata_size;
  45         char characteristics[64];   /* from read_device_characteristics */
  46         char configuration_data[256]; /* from read_configuration_data */
  47         unsigned int format;          /* format info like formatted/cdl/ldl/... */
  48         unsigned int features;        /* dasd features like 'ro',...            */
  49         unsigned int reserved0;       /* reserved for further use ,...          */
  50         unsigned int reserved1;       /* reserved for further use ,...          */
  51         unsigned int reserved2;       /* reserved for further use ,...          */
  52         unsigned int reserved3;       /* reserved for further use ,...          */
  53         unsigned int reserved4;       /* reserved for further use ,...          */
  54         unsigned int reserved5;       /* reserved for further use ,...          */
  55         unsigned int reserved6;       /* reserved for further use ,...          */
  56         unsigned int reserved7;       /* reserved for further use ,...          */
  57 } dasd_information2_t;
  58
  59 /*
  60  * values to be used for dasd_information_t.format
  61  * 0x00: NOT formatted
  62  * 0x01: Linux disc layout
  63  * 0x02: Common disc layout
  64  */
  65 #define DASD_FORMAT_NONE 0
  66 #define DASD_FORMAT_LDL  1
  67 #define DASD_FORMAT_CDL  2
  68 /*
  69  * values to be used for dasd_information_t.features
  70  * 0x00: default features
  71  * 0x01: readonly (ro)
  72  * 0x02: use diag discipline (diag)
  73  */
  74 #define DASD_FEATURE_DEFAULT  0
  75 #define DASD_FEATURE_READONLY 1
  76 #define DASD_FEATURE_USEDIAG  2
  77
  78 #define DASD_PARTN_BITS 2
  79
  80 /*
  81  * struct dasd_information_t
  82  * represents any data about the data, which is visible to userspace
  83  */
  84 typedef struct dasd_information_t {
  85         unsigned int devno;         /* S/390 devno */
  86         unsigned int real_devno;    /* for aliases */
  87         unsigned int schid;         /* S/390 subchannel identifier */
  88         unsigned int cu_type  : 16; /* from SenseID */
  89         unsigned int cu_model :  8; /* from SenseID */
  90         unsigned int dev_type : 16; /* from SenseID */
  91         unsigned int dev_model : 8; /* from SenseID */
  92         unsigned int open_count;
  93         unsigned int req_queue_len;
  94         unsigned int chanq_len;     /* length of chanq */
  95         char type[4];               /* from discipline.name, 'none' for unknown */
  96         unsigned int status;        /* current device level */
  97         unsigned int label_block;   /* where to find the VOLSER */
  98         unsigned int FBA_layout;    /* fixed block size (like AIXVOL) */
  99         unsigned int characteristics_size;
 100         unsigned int confdata_size;
 101         char characteristics[64];   /* from read_device_characteristics */
 102         char configuration_data[256]; /* from read_configuration_data */
 103 } dasd_information_t;
 104
 105 /*
 106  * Read Subsystem Data - Perfomance Statistics
 107  */
 108 typedef struct dasd_rssd_perf_stats_t {
 109         unsigned char  invalid:1;
 110         unsigned char  format:3;
 111         unsigned char  data_format:4;
 112         unsigned char  unit_address;
 113         unsigned short device_status;
 114         unsigned int   nr_read_normal;
 115         unsigned int   nr_read_normal_hits;
 116         unsigned int   nr_write_normal;
 117         unsigned int   nr_write_fast_normal_hits;
 118         unsigned int   nr_read_seq;
 119         unsigned int   nr_read_seq_hits;
 120         unsigned int   nr_write_seq;
 121         unsigned int   nr_write_fast_seq_hits;
 122         unsigned int   nr_read_cache;
 123         unsigned int   nr_read_cache_hits;
 124         unsigned int   nr_write_cache;
 125         unsigned int   nr_write_fast_cache_hits;
 126         unsigned int   nr_inhibit_cache;
 127         unsigned int   nr_bybass_cache;
 128         unsigned int   nr_seq_dasd_to_cache;
 129         unsigned int   nr_dasd_to_cache;
 130         unsigned int   nr_cache_to_dasd;
 131         unsigned int   nr_delayed_fast_write;
 132         unsigned int   nr_normal_fast_write;
 133         unsigned int   nr_seq_fast_write;
 134         unsigned int   nr_cache_miss;
 135         unsigned char  status2;
 136         unsigned int   nr_quick_write_promotes;
 137         unsigned char  reserved;
 138         unsigned short ssid;
 139         unsigned char  reseved2[96];
 140 } __attribute__((packed)) dasd_rssd_perf_stats_t;
 141
 142 /*
 143  * struct profile_info_t
 144  * holds the profinling information
 145  */
 146 typedef struct dasd_profile_info_t {
 147         unsigned int dasd_io_reqs;       /* number of requests processed at all */
 148         unsigned int dasd_io_sects;      /* number of sectors processed at all */
 149         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 150         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 151         unsigned int dasd_io_timps[32];  /* histogram of requests's times per sector */
 152         unsigned int dasd_io_time1[32];  /* histogram of time from build to start */
 153         unsigned int dasd_io_time2[32];  /* histogram of time from start to irq */
 154         unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
 155         unsigned int dasd_io_time3[32];  /* histogram of time from irq to end */
 156         unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
 157 } dasd_profile_info_t;
 158
 159 /*
 160  * struct format_data_t
 161  * represents all data necessary to format a dasd
 162  */
 163 typedef struct format_data_t {
 164         int start_unit; /* from track */
 165         int stop_unit;  /* to track */
 166         int blksize;    /* sectorsize */
 167         int intensity;
 168 } format_data_t;
 169
 170 /*
 171  * values to be used for format_data_t.intensity
 172  * 0/8: normal format
 173  * 1/9: also write record zero
 174  * 3/11: also write home address
 175  * 4/12: invalidate track
 176  */
 177 #define DASD_FMT_INT_FMT_R0 1 /* write record zero */
 178 #define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
 179 #define DASD_FMT_INT_INVAL  4 /* invalidate tracks */
 180 #define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
 181
 182
 183 /*
 184  * struct attrib_data_t
 185  * represents the operation (cache) bits for the device.
 186  * Used in DE to influence caching of the DASD.
 187  */
 188 typedef struct attrib_data_t {
 189         unsigned char operation:3;     /* cache operation mode */
 190         unsigned char reserved:5;      /* cache operation mode */
 191         __u16         nr_cyl;          /* no of cyliners for read ahaed */
 192         __u8          reserved2[29];   /* for future use */
 193 } __attribute__ ((packed)) attrib_data_t;
 194
 195 /* definition of operation (cache) bits within attributes of DE */
 196 #define DASD_NORMAL_CACHE  0x0
 197 #define DASD_BYPASS_CACHE  0x1
 198 #define DASD_INHIBIT_LOAD  0x2
 199 #define DASD_SEQ_ACCESS    0x3
 200 #define DASD_SEQ_PRESTAGE  0x4
 201 #define DASD_REC_ACCESS    0x5
 202
 203
 204 /********************************************************************************
 205  * SECTION: Definition of IOCTLs
 206  *
 207  * Here ist how the ioctl-nr should be used:
 208  *    0 -   31   DASD driver itself
 209  *   32 -  239   still open
 210  *  240 -  255   reserved for EMC
 211  *******************************************************************************/
 212
 213 /* Disable the volume (for Linux) */
 214 #define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
 215 /* Enable the volume (for Linux) */
 216 #define BIODASDENABLE  _IO(DASD_IOCTL_LETTER,1)
 217 /* Issue a reserve/release command, rsp. */
 218 #define BIODASDRSRV    _IO(DASD_IOCTL_LETTER,2) /* reserve */
 219 #define BIODASDRLSE    _IO(DASD_IOCTL_LETTER,3) /* release */
 220 #define BIODASDSLCK    _IO(DASD_IOCTL_LETTER,4) /* steal lock */
 221 /* reset profiling information of a device */
 222 #define BIODASDPRRST   _IO(DASD_IOCTL_LETTER,5)
 223 /* Quiesce IO on device */
 224 #define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
 225 /* Resume IO on device */
 226 #define BIODASDRESUME  _IO(DASD_IOCTL_LETTER,7)
 227
 228
 229 /* retrieve API version number */
 230 #define DASDAPIVER     _IOR(DASD_IOCTL_LETTER,0,int)
 231 /* Get information on a dasd device */
 232 #define BIODASDINFO    _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
 233 /* retrieve profiling information of a device */
 234 #define BIODASDPRRD    _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
 235 /* Get information on a dasd device (enhanced) */
 236 #define BIODASDINFO2   _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
 237 /* Performance Statistics Read */
 238 #define BIODASDPSRD    _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
 239 /* Get Attributes (cache operations) */
 240 #define BIODASDGATTR   _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
 241
 242
 243 /* #define BIODASDFORMAT  _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
 244 #define BIODASDFMT     _IOW(DASD_IOCTL_LETTER,1,format_data_t)
 245 /* Set Attributes (cache operations) */
 246 #define BIODASDSATTR   _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
 247
 248
 249 #endif                          /* DASD_H */
 250
 251 /*
 252  * Overrides for Emacs so that we follow Linus's tabbing style.
 253  * Emacs will notice this stuff at the end of the file and automatically
 254  * adjust the settings for this buffer only.  This must remain at the end
 255  * of the file.
 256  * ---------------------------------------------------------------------------
 257  * Local variables:
 258  * c-indent-level: 4
 259  * c-brace-imaginary-offset: 0
 260  * c-brace-offset: -4
 261  * c-argdecl-indent: 4
 262  * c-label-offset: -4
 263  * c-continued-statement-offset: 4
 264  * c-continued-brace-offset: 0
 265  * indent-tabs-mode: nil
 266  * tab-width: 8
 267  * End:
 268  */