1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Common interface for I/O on S/390 4 */ 5#ifndef _ASM_S390_CIO_H_ 6#define _ASM_S390_CIO_H_ 7 8#include <linux/spinlock.h> 9#include <linux/bitops.h> 10#include <asm/types.h> 11 12#define LPM_ANYPATH 0xff 13#define __MAX_CSSID 0 14#define __MAX_SUBCHANNEL 65535 15#define __MAX_SSID 3 16 17#include <asm/scsw.h> 18 19/** 20 * struct ccw1 - channel command word 21 * @cmd_code: command code 22 * @flags: flags, like IDA addressing, etc. 23 * @count: byte count 24 * @cda: data address 25 * 26 * The ccw is the basic structure to build channel programs that perform 27 * operations with the device or the control unit. Only Format-1 channel 28 * command words are supported. 29 */ 30struct ccw1 { 31 __u8 cmd_code; 32 __u8 flags; 33 __u16 count; 34 __u32 cda; 35} __attribute__ ((packed,aligned(8))); 36 37/** 38 * struct ccw0 - channel command word 39 * @cmd_code: command code 40 * @cda: data address 41 * @flags: flags, like IDA addressing, etc. 42 * @reserved: will be ignored 43 * @count: byte count 44 * 45 * The format-0 ccw structure. 46 */ 47struct ccw0 { 48 __u8 cmd_code; 49 __u32 cda : 24; 50 __u8 flags; 51 __u8 reserved; 52 __u16 count; 53} __packed __aligned(8); 54 55#define CCW_FLAG_DC 0x80 56#define CCW_FLAG_CC 0x40 57#define CCW_FLAG_SLI 0x20 58#define CCW_FLAG_SKIP 0x10 59#define CCW_FLAG_PCI 0x08 60#define CCW_FLAG_IDA 0x04 61#define CCW_FLAG_SUSPEND 0x02 62 63#define CCW_CMD_READ_IPL 0x02 64#define CCW_CMD_NOOP 0x03 65#define CCW_CMD_BASIC_SENSE 0x04 66#define CCW_CMD_TIC 0x08 67#define CCW_CMD_STLCK 0x14 68#define CCW_CMD_SENSE_PGID 0x34 69#define CCW_CMD_SUSPEND_RECONN 0x5B 70#define CCW_CMD_RDC 0x64 71#define CCW_CMD_RELEASE 0x94 72#define CCW_CMD_SET_PGID 0xAF 73#define CCW_CMD_SENSE_ID 0xE4 74#define CCW_CMD_DCTL 0xF3 75 76#define SENSE_MAX_COUNT 0x20 77 78/** 79 * struct erw - extended report word 80 * @res0: reserved 81 * @auth: authorization check 82 * @pvrf: path-verification-required flag 83 * @cpt: channel-path timeout 84 * @fsavf: failing storage address validity flag 85 * @cons: concurrent sense 86 * @scavf: secondary ccw address validity flag 87 * @fsaf: failing storage address format 88 * @scnt: sense count, if @cons == %1 89 * @res16: reserved 90 */ 91struct erw { 92 __u32 res0 : 3; 93 __u32 auth : 1; 94 __u32 pvrf : 1; 95 __u32 cpt : 1; 96 __u32 fsavf : 1; 97 __u32 cons : 1; 98 __u32 scavf : 1; 99 __u32 fsaf : 1; 100 __u32 scnt : 6; 101 __u32 res16 : 16; 102} __attribute__ ((packed)); 103 104/** 105 * struct erw_eadm - EADM Subchannel extended report word 106 * @b: aob error 107 * @r: arsb error 108 */ 109struct erw_eadm { 110 __u32 : 16; 111 __u32 b : 1; 112 __u32 r : 1; 113 __u32 : 14; 114} __packed; 115 116/** 117 * struct sublog - subchannel logout area 118 * @res0: reserved 119 * @esf: extended status flags 120 * @lpum: last path used mask 121 * @arep: ancillary report 122 * @fvf: field-validity flags 123 * @sacc: storage access code 124 * @termc: termination code 125 * @devsc: device-status check 126 * @serr: secondary error 127 * @ioerr: i/o-error alert 128 * @seqc: sequence code 129 */ 130struct sublog { 131 __u32 res0 : 1; 132 __u32 esf : 7; 133 __u32 lpum : 8; 134 __u32 arep : 1; 135 __u32 fvf : 5; 136 __u32 sacc : 2; 137 __u32 termc : 2; 138 __u32 devsc : 1; 139 __u32 serr : 1; 140 __u32 ioerr : 1; 141 __u32 seqc : 3; 142} __attribute__ ((packed)); 143 144/** 145 * struct esw0 - Format 0 Extended Status Word (ESW) 146 * @sublog: subchannel logout 147 * @erw: extended report word 148 * @faddr: failing storage address 149 * @saddr: secondary ccw address 150 */ 151struct esw0 { 152 struct sublog sublog; 153 struct erw erw; 154 __u32 faddr[2]; 155 __u32 saddr; 156} __attribute__ ((packed)); 157 158/** 159 * struct esw1 - Format 1 Extended Status Word (ESW) 160 * @zero0: reserved zeros 161 * @lpum: last path used mask 162 * @zero16: reserved zeros 163 * @erw: extended report word 164 * @zeros: three fullwords of zeros 165 */ 166struct esw1 { 167 __u8 zero0; 168 __u8 lpum; 169 __u16 zero16; 170 struct erw erw; 171 __u32 zeros[3]; 172} __attribute__ ((packed)); 173 174/** 175 * struct esw2 - Format 2 Extended Status Word (ESW) 176 * @zero0: reserved zeros 177 * @lpum: last path used mask 178 * @dcti: device-connect-time interval 179 * @erw: extended report word 180 * @zeros: three fullwords of zeros 181 */ 182struct esw2 { 183 __u8 zero0; 184 __u8 lpum; 185 __u16 dcti; 186 struct erw erw; 187 __u32 zeros[3]; 188} __attribute__ ((packed)); 189 190/** 191 * struct esw3 - Format 3 Extended Status Word (ESW) 192 * @zero0: reserved zeros 193 * @lpum: last path used mask 194 * @res: reserved 195 * @erw: extended report word 196 * @zeros: three fullwords of zeros 197 */ 198struct esw3 { 199 __u8 zero0; 200 __u8 lpum; 201 __u16 res; 202 struct erw erw; 203 __u32 zeros[3]; 204} __attribute__ ((packed)); 205 206/** 207 * struct esw_eadm - EADM Subchannel Extended Status Word (ESW) 208 * @sublog: subchannel logout 209 * @erw: extended report word 210 */ 211struct esw_eadm { 212 __u32 sublog; 213 struct erw_eadm erw; 214 __u32 : 32; 215 __u32 : 32; 216 __u32 : 32; 217} __packed; 218 219/** 220 * struct irb - interruption response block 221 * @scsw: subchannel status word 222 * @esw: extended status word 223 * @ecw: extended control word 224 * 225 * The irb that is handed to the device driver when an interrupt occurs. For 226 * solicited interrupts, the common I/O layer already performs checks whether 227 * a field is valid; a field not being valid is always passed as %0. 228 * If a unit check occurred, @ecw may contain sense data; this is retrieved 229 * by the common I/O layer itself if the device doesn't support concurrent 230 * sense (so that the device driver never needs to perform basic sense itself). 231 * For unsolicited interrupts, the irb is passed as-is (expect for sense data, 232 * if applicable). 233 */ 234struct irb { 235 union scsw scsw; 236 union { 237 struct esw0 esw0; 238 struct esw1 esw1; 239 struct esw2 esw2; 240 struct esw3 esw3; 241 struct esw_eadm eadm; 242 } esw; 243 __u8 ecw[32]; 244} __attribute__ ((packed,aligned(4))); 245 246/** 247 * struct ciw - command information word (CIW) layout 248 * @et: entry type 249 * @reserved: reserved bits 250 * @ct: command type 251 * @cmd: command code 252 * @count: command count 253 */ 254struct ciw { 255 __u32 et : 2; 256 __u32 reserved : 2; 257 __u32 ct : 4; 258 __u32 cmd : 8; 259 __u32 count : 16; 260} __attribute__ ((packed)); 261 262#define CIW_TYPE_RCD 0x0 /* read configuration data */ 263#define CIW_TYPE_SII 0x1 /* set interface identifier */ 264#define CIW_TYPE_RNI 0x2 /* read node identifier */ 265 266/* 267 * Flags used as input parameters for do_IO() 268 */ 269#define DOIO_ALLOW_SUSPEND 0x0001 /* allow for channel prog. suspend */ 270#define DOIO_DENY_PREFETCH 0x0002 /* don't allow for CCW prefetch */ 271#define DOIO_SUPPRESS_INTER 0x0004 /* suppress intermediate inter. */ 272 /* ... for suspended CCWs */ 273/* Device or subchannel gone. */ 274#define CIO_GONE 0x0001 275/* No path to device. */ 276#define CIO_NO_PATH 0x0002 277/* Device has appeared. */ 278#define CIO_OPER 0x0004 279/* Sick revalidation of device. */ 280#define CIO_REVALIDATE 0x0008 281/* Device did not respond in time. */ 282#define CIO_BOXED 0x0010 283 284/** 285 * struct ccw_dev_id - unique identifier for ccw devices 286 * @ssid: subchannel set id 287 * @devno: device number 288 * 289 * This structure is not directly based on any hardware structure. The 290 * hardware identifies a device by its device number and its subchannel, 291 * which is in turn identified by its id. In order to get a unique identifier 292 * for ccw devices across subchannel sets, @struct ccw_dev_id has been 293 * introduced. 294 */ 295struct ccw_dev_id { 296 u8 ssid; 297 u16 devno; 298}; 299 300/** 301 * ccw_device_id_is_equal() - compare two ccw_dev_ids 302 * @dev_id1: a ccw_dev_id 303 * @dev_id2: another ccw_dev_id 304 * Returns: 305 * %1 if the two structures are equal field-by-field, 306 * %0 if not. 307 * Context: 308 * any 309 */ 310static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1, 311 struct ccw_dev_id *dev_id2) 312{ 313 if ((dev_id1->ssid == dev_id2->ssid) && 314 (dev_id1->devno == dev_id2->devno)) 315 return 1; 316 return 0; 317} 318 319/** 320 * pathmask_to_pos() - find the position of the left-most bit in a pathmask 321 * @mask: pathmask with at least one bit set 322 */ 323static inline u8 pathmask_to_pos(u8 mask) 324{ 325 return 8 - ffs(mask); 326} 327 328void channel_subsystem_reinit(void); 329extern void css_schedule_reprobe(void); 330 331/* Function from drivers/s390/cio/chsc.c */ 332int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta); 333int chsc_sstpi(void *page, void *result, size_t size); 334 335#endif 336