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