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 */ 29struct ccw1 { 30 __u8 cmd_code; 31 __u8 flags; 32 __u16 count; 33 __u32 cda; 34} __attribute__ ((packed,aligned(8))); 35 36/** 37 * struct ccw0 - channel command word 38 * @cmd_code: command code 39 * @cda: data address 40 * @flags: flags, like IDA addressing, etc. 41 * @reserved: will be ignored 42 * @count: byte count 43 * 44 * The format-0 ccw structure. 45 */ 46struct ccw0 { 47 __u8 cmd_code; 48 __u32 cda : 24; 49 __u8 flags; 50 __u8 reserved; 51 __u16 count; 52} __packed __aligned(8); 53 54#define CCW_FLAG_DC 0x80 55#define CCW_FLAG_CC 0x40 56#define CCW_FLAG_SLI 0x20 57#define CCW_FLAG_SKIP 0x10 58#define CCW_FLAG_PCI 0x08 59#define CCW_FLAG_IDA 0x04 60#define CCW_FLAG_SUSPEND 0x02 61 62#define CCW_CMD_READ_IPL 0x02 63#define CCW_CMD_NOOP 0x03 64#define CCW_CMD_BASIC_SENSE 0x04 65#define CCW_CMD_TIC 0x08 66#define CCW_CMD_STLCK 0x14 67#define CCW_CMD_SENSE_PGID 0x34 68#define CCW_CMD_SUSPEND_RECONN 0x5B 69#define CCW_CMD_RDC 0x64 70#define CCW_CMD_RELEASE 0x94 71#define CCW_CMD_SET_PGID 0xAF 72#define CCW_CMD_SENSE_ID 0xE4 73#define CCW_CMD_DCTL 0xF3 74 75#define SENSE_MAX_COUNT 0x20 76 77/** 78 * struct erw - extended report word 79 * @res0: reserved 80 * @auth: authorization check 81 * @pvrf: path-verification-required flag 82 * @cpt: channel-path timeout 83 * @fsavf: failing storage address validity flag 84 * @cons: concurrent sense 85 * @scavf: secondary ccw address validity flag 86 * @fsaf: failing storage address format 87 * @scnt: sense count, if @cons == %1 88 * @res16: reserved 89 */ 90struct erw { 91 __u32 res0 : 3; 92 __u32 auth : 1; 93 __u32 pvrf : 1; 94 __u32 cpt : 1; 95 __u32 fsavf : 1; 96 __u32 cons : 1; 97 __u32 scavf : 1; 98 __u32 fsaf : 1; 99 __u32 scnt : 6; 100 __u32 res16 : 16; 101} __attribute__ ((packed)); 102 103/** 104 * struct erw_eadm - EADM Subchannel extended report word 105 * @b: aob error 106 * @r: arsb error 107 */ 108struct erw_eadm { 109 __u32 : 16; 110 __u32 b : 1; 111 __u32 r : 1; 112 __u32 : 14; 113} __packed; 114 115/** 116 * struct sublog - subchannel logout area 117 * @res0: reserved 118 * @esf: extended status flags 119 * @lpum: last path used mask 120 * @arep: ancillary report 121 * @fvf: field-validity flags 122 * @sacc: storage access code 123 * @termc: termination code 124 * @devsc: device-status check 125 * @serr: secondary error 126 * @ioerr: i/o-error alert 127 * @seqc: sequence code 128 */ 129struct sublog { 130 __u32 res0 : 1; 131 __u32 esf : 7; 132 __u32 lpum : 8; 133 __u32 arep : 1; 134 __u32 fvf : 5; 135 __u32 sacc : 2; 136 __u32 termc : 2; 137 __u32 devsc : 1; 138 __u32 serr : 1; 139 __u32 ioerr : 1; 140 __u32 seqc : 3; 141} __attribute__ ((packed)); 142 143/** 144 * struct esw0 - Format 0 Extended Status Word (ESW) 145 * @sublog: subchannel logout 146 * @erw: extended report word 147 * @faddr: failing storage address 148 * @saddr: secondary ccw address 149 */ 150struct esw0 { 151 struct sublog sublog; 152 struct erw erw; 153 __u32 faddr[2]; 154 __u32 saddr; 155} __attribute__ ((packed)); 156 157/** 158 * struct esw1 - Format 1 Extended Status Word (ESW) 159 * @zero0: reserved zeros 160 * @lpum: last path used mask 161 * @zero16: reserved zeros 162 * @erw: extended report word 163 * @zeros: three fullwords of zeros 164 */ 165struct esw1 { 166 __u8 zero0; 167 __u8 lpum; 168 __u16 zero16; 169 struct erw erw; 170 __u32 zeros[3]; 171} __attribute__ ((packed)); 172 173/** 174 * struct esw2 - Format 2 Extended Status Word (ESW) 175 * @zero0: reserved zeros 176 * @lpum: last path used mask 177 * @dcti: device-connect-time interval 178 * @erw: extended report word 179 * @zeros: three fullwords of zeros 180 */ 181struct esw2 { 182 __u8 zero0; 183 __u8 lpum; 184 __u16 dcti; 185 struct erw erw; 186 __u32 zeros[3]; 187} __attribute__ ((packed)); 188 189/** 190 * struct esw3 - Format 3 Extended Status Word (ESW) 191 * @zero0: reserved zeros 192 * @lpum: last path used mask 193 * @res: reserved 194 * @erw: extended report word 195 * @zeros: three fullwords of zeros 196 */ 197struct esw3 { 198 __u8 zero0; 199 __u8 lpum; 200 __u16 res; 201 struct erw erw; 202 __u32 zeros[3]; 203} __attribute__ ((packed)); 204 205/** 206 * struct esw_eadm - EADM Subchannel Extended Status Word (ESW) 207 * @sublog: subchannel logout 208 * @erw: extended report word 209 */ 210struct esw_eadm { 211 __u32 sublog; 212 struct erw_eadm erw; 213 __u32 : 32; 214 __u32 : 32; 215 __u32 : 32; 216} __packed; 217 218/** 219 * struct irb - interruption response block 220 * @scsw: subchannel status word 221 * @esw: extended status word 222 * @ecw: extended control word 223 * 224 * The irb that is handed to the device driver when an interrupt occurs. For 225 * solicited interrupts, the common I/O layer already performs checks whether 226 * a field is valid; a field not being valid is always passed as %0. 227 * If a unit check occurred, @ecw may contain sense data; this is retrieved 228 * by the common I/O layer itself if the device doesn't support concurrent 229 * sense (so that the device driver never needs to perform basic sene itself). 230 * For unsolicited interrupts, the irb is passed as-is (expect for sense data, 231 * if applicable). 232 */ 233struct irb { 234 union scsw scsw; 235 union { 236 struct esw0 esw0; 237 struct esw1 esw1; 238 struct esw2 esw2; 239 struct esw3 esw3; 240 struct esw_eadm eadm; 241 } esw; 242 __u8 ecw[32]; 243} __attribute__ ((packed,aligned(4))); 244 245/** 246 * struct ciw - command information word (CIW) layout 247 * @et: entry type 248 * @reserved: reserved bits 249 * @ct: command type 250 * @cmd: command code 251 * @count: command count 252 */ 253struct ciw { 254 __u32 et : 2; 255 __u32 reserved : 2; 256 __u32 ct : 4; 257 __u32 cmd : 8; 258 __u32 count : 16; 259} __attribute__ ((packed)); 260 261#define CIW_TYPE_RCD 0x0 /* read configuration data */ 262#define CIW_TYPE_SII 0x1 /* set interface identifier */ 263#define CIW_TYPE_RNI 0x2 /* read node identifier */ 264 265/* 266 * Flags used as input parameters for do_IO() 267 */ 268#define DOIO_ALLOW_SUSPEND 0x0001 /* allow for channel prog. suspend */ 269#define DOIO_DENY_PREFETCH 0x0002 /* don't allow for CCW prefetch */ 270#define DOIO_SUPPRESS_INTER 0x0004 /* suppress intermediate inter. */ 271 /* ... for suspended CCWs */ 272/* Device or subchannel gone. */ 273#define CIO_GONE 0x0001 274/* No path to device. */ 275#define CIO_NO_PATH 0x0002 276/* Device has appeared. */ 277#define CIO_OPER 0x0004 278/* Sick revalidation of device. */ 279#define CIO_REVALIDATE 0x0008 280/* Device did not respond in time. */ 281#define CIO_BOXED 0x0010 282 283/** 284 * struct ccw_dev_id - unique identifier for ccw devices 285 * @ssid: subchannel set id 286 * @devno: device number 287 * 288 * This structure is not directly based on any hardware structure. The 289 * hardware identifies a device by its device number and its subchannel, 290 * which is in turn identified by its id. In order to get a unique identifier 291 * for ccw devices across subchannel sets, @struct ccw_dev_id has been 292 * introduced. 293 */ 294struct ccw_dev_id { 295 u8 ssid; 296 u16 devno; 297}; 298 299/** 300 * ccw_device_id_is_equal() - compare two ccw_dev_ids 301 * @dev_id1: a ccw_dev_id 302 * @dev_id2: another ccw_dev_id 303 * Returns: 304 * %1 if the two structures are equal field-by-field, 305 * %0 if not. 306 * Context: 307 * any 308 */ 309static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1, 310 struct ccw_dev_id *dev_id2) 311{ 312 if ((dev_id1->ssid == dev_id2->ssid) && 313 (dev_id1->devno == dev_id2->devno)) 314 return 1; 315 return 0; 316} 317 318/** 319 * pathmask_to_pos() - find the position of the left-most bit in a pathmask 320 * @mask: pathmask with at least one bit set 321 */ 322static inline u8 pathmask_to_pos(u8 mask) 323{ 324 return 8 - ffs(mask); 325} 326 327void channel_subsystem_reinit(void); 328extern void css_schedule_reprobe(void); 329 330extern void reipl_ccw_dev(struct ccw_dev_id *id); 331 332struct cio_iplinfo { 333 u8 ssid; 334 u16 devno; 335 int is_qdio; 336}; 337 338extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo); 339 340/* Function from drivers/s390/cio/chsc.c */ 341int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta); 342int chsc_sstpi(void *page, void *result, size_t size); 343 344#endif 345