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