1 /* 2 * Common interface for I/O on S/390 3 */ 4 #ifndef _ASM_S390_CIO_H_ 5 #define _ASM_S390_CIO_H_ 6 7 #include <linux/spinlock.h> 8 #include <linux/bitops.h> 9 #include <asm/types.h> 10 11 #define LPM_ANYPATH 0xff 12 #define __MAX_CSSID 0 13 #define __MAX_SUBCHANNEL 65535 14 #define __MAX_SSID 3 15 16 #include <asm/scsw.h> 17 18 /** 19 * struct ccw1 - channel command word 20 * @cmd_code: command code 21 * @flags: flags, like IDA addressing, etc. 22 * @count: byte count 23 * @cda: data address 24 * 25 * The ccw is the basic structure to build channel programs that perform 26 * operations with the device or the control unit. Only Format-1 channel 27 * command words are supported. 28 */ 29 struct ccw1 { 30 __u8 cmd_code; 31 __u8 flags; 32 __u16 count; 33 __u32 cda; 34 } __attribute__ ((packed,aligned(8))); 35 36 #define CCW_FLAG_DC 0x80 37 #define CCW_FLAG_CC 0x40 38 #define CCW_FLAG_SLI 0x20 39 #define CCW_FLAG_SKIP 0x10 40 #define CCW_FLAG_PCI 0x08 41 #define CCW_FLAG_IDA 0x04 42 #define CCW_FLAG_SUSPEND 0x02 43 44 #define CCW_CMD_READ_IPL 0x02 45 #define CCW_CMD_NOOP 0x03 46 #define CCW_CMD_BASIC_SENSE 0x04 47 #define CCW_CMD_TIC 0x08 48 #define CCW_CMD_STLCK 0x14 49 #define CCW_CMD_SENSE_PGID 0x34 50 #define CCW_CMD_SUSPEND_RECONN 0x5B 51 #define CCW_CMD_RDC 0x64 52 #define CCW_CMD_RELEASE 0x94 53 #define CCW_CMD_SET_PGID 0xAF 54 #define CCW_CMD_SENSE_ID 0xE4 55 #define CCW_CMD_DCTL 0xF3 56 57 #define SENSE_MAX_COUNT 0x20 58 59 /** 60 * struct erw - extended report word 61 * @res0: reserved 62 * @auth: authorization check 63 * @pvrf: path-verification-required flag 64 * @cpt: channel-path timeout 65 * @fsavf: failing storage address validity flag 66 * @cons: concurrent sense 67 * @scavf: secondary ccw address validity flag 68 * @fsaf: failing storage address format 69 * @scnt: sense count, if @cons == %1 70 * @res16: reserved 71 */ 72 struct erw { 73 __u32 res0 : 3; 74 __u32 auth : 1; 75 __u32 pvrf : 1; 76 __u32 cpt : 1; 77 __u32 fsavf : 1; 78 __u32 cons : 1; 79 __u32 scavf : 1; 80 __u32 fsaf : 1; 81 __u32 scnt : 6; 82 __u32 res16 : 16; 83 } __attribute__ ((packed)); 84 85 /** 86 * struct erw_eadm - EADM Subchannel extended report word 87 * @b: aob error 88 * @r: arsb error 89 */ 90 struct erw_eadm { 91 __u32 : 16; 92 __u32 b : 1; 93 __u32 r : 1; 94 __u32 : 14; 95 } __packed; 96 97 /** 98 * struct sublog - subchannel logout area 99 * @res0: reserved 100 * @esf: extended status flags 101 * @lpum: last path used mask 102 * @arep: ancillary report 103 * @fvf: field-validity flags 104 * @sacc: storage access code 105 * @termc: termination code 106 * @devsc: device-status check 107 * @serr: secondary error 108 * @ioerr: i/o-error alert 109 * @seqc: sequence code 110 */ 111 struct sublog { 112 __u32 res0 : 1; 113 __u32 esf : 7; 114 __u32 lpum : 8; 115 __u32 arep : 1; 116 __u32 fvf : 5; 117 __u32 sacc : 2; 118 __u32 termc : 2; 119 __u32 devsc : 1; 120 __u32 serr : 1; 121 __u32 ioerr : 1; 122 __u32 seqc : 3; 123 } __attribute__ ((packed)); 124 125 /** 126 * struct esw0 - Format 0 Extended Status Word (ESW) 127 * @sublog: subchannel logout 128 * @erw: extended report word 129 * @faddr: failing storage address 130 * @saddr: secondary ccw address 131 */ 132 struct esw0 { 133 struct sublog sublog; 134 struct erw erw; 135 __u32 faddr[2]; 136 __u32 saddr; 137 } __attribute__ ((packed)); 138 139 /** 140 * struct esw1 - Format 1 Extended Status Word (ESW) 141 * @zero0: reserved zeros 142 * @lpum: last path used mask 143 * @zero16: reserved zeros 144 * @erw: extended report word 145 * @zeros: three fullwords of zeros 146 */ 147 struct esw1 { 148 __u8 zero0; 149 __u8 lpum; 150 __u16 zero16; 151 struct erw erw; 152 __u32 zeros[3]; 153 } __attribute__ ((packed)); 154 155 /** 156 * struct esw2 - Format 2 Extended Status Word (ESW) 157 * @zero0: reserved zeros 158 * @lpum: last path used mask 159 * @dcti: device-connect-time interval 160 * @erw: extended report word 161 * @zeros: three fullwords of zeros 162 */ 163 struct esw2 { 164 __u8 zero0; 165 __u8 lpum; 166 __u16 dcti; 167 struct erw erw; 168 __u32 zeros[3]; 169 } __attribute__ ((packed)); 170 171 /** 172 * struct esw3 - Format 3 Extended Status Word (ESW) 173 * @zero0: reserved zeros 174 * @lpum: last path used mask 175 * @res: reserved 176 * @erw: extended report word 177 * @zeros: three fullwords of zeros 178 */ 179 struct esw3 { 180 __u8 zero0; 181 __u8 lpum; 182 __u16 res; 183 struct erw erw; 184 __u32 zeros[3]; 185 } __attribute__ ((packed)); 186 187 /** 188 * struct esw_eadm - EADM Subchannel Extended Status Word (ESW) 189 * @sublog: subchannel logout 190 * @erw: extended report word 191 */ 192 struct esw_eadm { 193 __u32 sublog; 194 struct erw_eadm erw; 195 __u32 : 32; 196 __u32 : 32; 197 __u32 : 32; 198 } __packed; 199 200 /** 201 * struct irb - interruption response block 202 * @scsw: subchannel status word 203 * @esw: extended status word 204 * @ecw: extended control word 205 * 206 * The irb that is handed to the device driver when an interrupt occurs. For 207 * solicited interrupts, the common I/O layer already performs checks whether 208 * a field is valid; a field not being valid is always passed as %0. 209 * If a unit check occurred, @ecw may contain sense data; this is retrieved 210 * by the common I/O layer itself if the device doesn't support concurrent 211 * sense (so that the device driver never needs to perform basic sene itself). 212 * For unsolicited interrupts, the irb is passed as-is (expect for sense data, 213 * if applicable). 214 */ 215 struct irb { 216 union scsw scsw; 217 union { 218 struct esw0 esw0; 219 struct esw1 esw1; 220 struct esw2 esw2; 221 struct esw3 esw3; 222 struct esw_eadm eadm; 223 } esw; 224 __u8 ecw[32]; 225 } __attribute__ ((packed,aligned(4))); 226 227 /** 228 * struct ciw - command information word (CIW) layout 229 * @et: entry type 230 * @reserved: reserved bits 231 * @ct: command type 232 * @cmd: command code 233 * @count: command count 234 */ 235 struct ciw { 236 __u32 et : 2; 237 __u32 reserved : 2; 238 __u32 ct : 4; 239 __u32 cmd : 8; 240 __u32 count : 16; 241 } __attribute__ ((packed)); 242 243 #define CIW_TYPE_RCD 0x0 /* read configuration data */ 244 #define CIW_TYPE_SII 0x1 /* set interface identifier */ 245 #define CIW_TYPE_RNI 0x2 /* read node identifier */ 246 247 /* 248 * Flags used as input parameters for do_IO() 249 */ 250 #define DOIO_ALLOW_SUSPEND 0x0001 /* allow for channel prog. suspend */ 251 #define DOIO_DENY_PREFETCH 0x0002 /* don't allow for CCW prefetch */ 252 #define DOIO_SUPPRESS_INTER 0x0004 /* suppress intermediate inter. */ 253 /* ... for suspended CCWs */ 254 /* Device or subchannel gone. */ 255 #define CIO_GONE 0x0001 256 /* No path to device. */ 257 #define CIO_NO_PATH 0x0002 258 /* Device has appeared. */ 259 #define CIO_OPER 0x0004 260 /* Sick revalidation of device. */ 261 #define CIO_REVALIDATE 0x0008 262 /* Device did not respond in time. */ 263 #define CIO_BOXED 0x0010 264 265 /** 266 * struct ccw_dev_id - unique identifier for ccw devices 267 * @ssid: subchannel set id 268 * @devno: device number 269 * 270 * This structure is not directly based on any hardware structure. The 271 * hardware identifies a device by its device number and its subchannel, 272 * which is in turn identified by its id. In order to get a unique identifier 273 * for ccw devices across subchannel sets, @struct ccw_dev_id has been 274 * introduced. 275 */ 276 struct ccw_dev_id { 277 u8 ssid; 278 u16 devno; 279 }; 280 281 /** 282 * ccw_device_id_is_equal() - compare two ccw_dev_ids 283 * @dev_id1: a ccw_dev_id 284 * @dev_id2: another ccw_dev_id 285 * Returns: 286 * %1 if the two structures are equal field-by-field, 287 * %0 if not. 288 * Context: 289 * any 290 */ 291 static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1, 292 struct ccw_dev_id *dev_id2) 293 { 294 if ((dev_id1->ssid == dev_id2->ssid) && 295 (dev_id1->devno == dev_id2->devno)) 296 return 1; 297 return 0; 298 } 299 300 /** 301 * pathmask_to_pos() - find the position of the left-most bit in a pathmask 302 * @mask: pathmask with at least one bit set 303 */ 304 static inline u8 pathmask_to_pos(u8 mask) 305 { 306 return 8 - ffs(mask); 307 } 308 309 void channel_subsystem_reinit(void); 310 extern void css_schedule_reprobe(void); 311 312 extern void reipl_ccw_dev(struct ccw_dev_id *id); 313 314 struct cio_iplinfo { 315 u8 ssid; 316 u16 devno; 317 int is_qdio; 318 }; 319 320 extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo); 321 322 /* Function from drivers/s390/cio/chsc.c */ 323 int chsc_sstpc(void *page, unsigned int op, u16 ctrl); 324 int chsc_sstpi(void *page, void *result, size_t size); 325 326 #endif 327