1 /* 2 * drivers/s390/cio/device_status.c 3 * 4 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, 5 * IBM Corporation 6 * Author(s): Cornelia Huck(cohuck@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Status accumulation and basic sense functions. 10 */ 11 12 #include <linux/config.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 16 #include <asm/ccwdev.h> 17 #include <asm/cio.h> 18 19 #include "cio.h" 20 #include "cio_debug.h" 21 #include "css.h" 22 #include "device.h" 23 #include "ioasm.h" 24 25 /* 26 * Check for any kind of channel or interface control check but don't 27 * issue the message for the console device 28 */ 29 static inline void 30 ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb) 31 { 32 if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK | 33 SCHN_STAT_CHN_CTRL_CHK | 34 SCHN_STAT_INTF_CTRL_CHK))) 35 return; 36 37 CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check " 38 "received" 39 " ... device %04X on subchannel %04X, dev_stat " 40 ": %02X sch_stat : %02X\n", 41 cdev->private->devno, cdev->private->irq, 42 irb->scsw.dstat, irb->scsw.cstat); 43 44 if (irb->scsw.cc != 3) { 45 char dbf_text[15]; 46 47 sprintf(dbf_text, "chk%x", cdev->private->irq); 48 CIO_TRACE_EVENT(0, dbf_text); 49 CIO_HEX_EVENT(0, irb, sizeof (struct irb)); 50 } 51 } 52 53 /* 54 * Some paths became not operational (pno bit in scsw is set). 55 */ 56 static void 57 ccw_device_path_notoper(struct ccw_device *cdev) 58 { 59 struct subchannel *sch; 60 61 sch = to_subchannel(cdev->dev.parent); 62 stsch (sch->irq, &sch->schib); 63 64 CIO_MSG_EVENT(0, "%s(%04x) - path(s) %02x are " 65 "not operational \n", __FUNCTION__, sch->irq, 66 sch->schib.pmcw.pnom); 67 68 sch->lpm &= ~sch->schib.pmcw.pnom; 69 if (cdev->private->options.pgroup) 70 cdev->private->flags.doverify = 1; 71 } 72 73 /* 74 * Copy valid bits from the extended control word to device irb. 75 */ 76 static inline void 77 ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb) 78 { 79 /* 80 * Copy extended control bit if it is valid... yes there 81 * are condition that have to be met for the extended control 82 * bit to have meaning. Sick. 83 */ 84 cdev->private->irb.scsw.ectl = 0; 85 if ((irb->scsw.stctl & SCSW_STCTL_ALERT_STATUS) && 86 !(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS)) 87 cdev->private->irb.scsw.ectl = irb->scsw.ectl; 88 /* Check if extended control word is valid. */ 89 if (!cdev->private->irb.scsw.ectl) 90 return; 91 /* Copy concurrent sense / model dependent information. */ 92 memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw)); 93 } 94 95 /* 96 * Check if extended status word is valid. 97 */ 98 static inline int 99 ccw_device_accumulate_esw_valid(struct irb *irb) 100 { 101 if (!irb->scsw.eswf && irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) 102 return 0; 103 if (irb->scsw.stctl == 104 (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) && 105 !(irb->scsw.actl & SCSW_ACTL_SUSPENDED)) 106 return 0; 107 return 1; 108 } 109 110 /* 111 * Copy valid bits from the extended status word to device irb. 112 */ 113 static inline void 114 ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb) 115 { 116 struct irb *cdev_irb; 117 struct sublog *cdev_sublog, *sublog; 118 119 if (!ccw_device_accumulate_esw_valid(irb)) 120 return; 121 122 cdev_irb = &cdev->private->irb; 123 124 /* Copy last path used mask. */ 125 cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum; 126 127 /* Copy subchannel logout information if esw is of format 0. */ 128 if (irb->scsw.eswf) { 129 cdev_sublog = &cdev_irb->esw.esw0.sublog; 130 sublog = &irb->esw.esw0.sublog; 131 /* Copy extended status flags. */ 132 cdev_sublog->esf = sublog->esf; 133 /* 134 * Copy fields that have a meaning for channel data check 135 * channel control check and interface control check. 136 */ 137 if (irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK | 138 SCHN_STAT_CHN_CTRL_CHK | 139 SCHN_STAT_INTF_CTRL_CHK)) { 140 /* Copy ancillary report bit. */ 141 cdev_sublog->arep = sublog->arep; 142 /* Copy field-validity-flags. */ 143 cdev_sublog->fvf = sublog->fvf; 144 /* Copy storage access code. */ 145 cdev_sublog->sacc = sublog->sacc; 146 /* Copy termination code. */ 147 cdev_sublog->termc = sublog->termc; 148 /* Copy sequence code. */ 149 cdev_sublog->seqc = sublog->seqc; 150 } 151 /* Copy device status check. */ 152 cdev_sublog->devsc = sublog->devsc; 153 /* Copy secondary error. */ 154 cdev_sublog->serr = sublog->serr; 155 /* Copy i/o-error alert. */ 156 cdev_sublog->ioerr = sublog->ioerr; 157 /* Copy channel path timeout bit. */ 158 if (irb->scsw.cstat & SCHN_STAT_INTF_CTRL_CHK) 159 cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt; 160 /* Copy failing storage address validity flag. */ 161 cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf; 162 if (cdev_irb->esw.esw0.erw.fsavf) { 163 /* ... and copy the failing storage address. */ 164 memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr, 165 sizeof (irb->esw.esw0.faddr)); 166 /* ... and copy the failing storage address format. */ 167 cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf; 168 } 169 /* Copy secondary ccw address validity bit. */ 170 cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf; 171 if (irb->esw.esw0.erw.scavf) 172 /* ... and copy the secondary ccw address. */ 173 cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr; 174 175 } 176 /* FIXME: DCTI for format 2? */ 177 178 /* Copy authorization bit. */ 179 cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth; 180 /* Copy path verification required flag. */ 181 cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf; 182 if (irb->esw.esw0.erw.pvrf && cdev->private->options.pgroup) 183 cdev->private->flags.doverify = 1; 184 /* Copy concurrent sense bit. */ 185 cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons; 186 if (irb->esw.esw0.erw.cons) 187 cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt; 188 } 189 190 /* 191 * Accumulate status from irb to devstat. 192 */ 193 void 194 ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb) 195 { 196 struct irb *cdev_irb; 197 198 /* 199 * Check if the status pending bit is set in stctl. 200 * If not, the remaining bit have no meaning and we must ignore them. 201 * The esw is not meaningful as well... 202 */ 203 if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND)) 204 return; 205 206 /* Check for channel checks and interface control checks. */ 207 ccw_device_msg_control_check(cdev, irb); 208 209 /* Check for path not operational. */ 210 if (irb->scsw.pno && irb->scsw.fctl != 0 && 211 (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) || 212 (irb->scsw.actl & SCSW_ACTL_SUSPENDED))) 213 ccw_device_path_notoper(cdev); 214 215 /* 216 * Don't accumulate unsolicited interrupts. 217 */ 218 if ((irb->scsw.stctl == 219 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && 220 (!irb->scsw.cc)) 221 return; 222 223 cdev_irb = &cdev->private->irb; 224 225 /* Copy bits which are valid only for the start function. */ 226 if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) { 227 /* Copy key. */ 228 cdev_irb->scsw.key = irb->scsw.key; 229 /* Copy suspend control bit. */ 230 cdev_irb->scsw.sctl = irb->scsw.sctl; 231 /* Accumulate deferred condition code. */ 232 cdev_irb->scsw.cc |= irb->scsw.cc; 233 /* Copy ccw format bit. */ 234 cdev_irb->scsw.fmt = irb->scsw.fmt; 235 /* Copy prefetch bit. */ 236 cdev_irb->scsw.pfch = irb->scsw.pfch; 237 /* Copy initial-status-interruption-control. */ 238 cdev_irb->scsw.isic = irb->scsw.isic; 239 /* Copy address limit checking control. */ 240 cdev_irb->scsw.alcc = irb->scsw.alcc; 241 /* Copy suppress suspend bit. */ 242 cdev_irb->scsw.ssi = irb->scsw.ssi; 243 } 244 245 /* Take care of the extended control bit and extended control word. */ 246 ccw_device_accumulate_ecw(cdev, irb); 247 248 /* Accumulate function control. */ 249 cdev_irb->scsw.fctl |= irb->scsw.fctl; 250 /* Copy activity control. */ 251 cdev_irb->scsw.actl= irb->scsw.actl; 252 /* Accumulate status control. */ 253 cdev_irb->scsw.stctl |= irb->scsw.stctl; 254 /* 255 * Copy ccw address if it is valid. This is a bit simplified 256 * but should be close enough for all practical purposes. 257 */ 258 if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) || 259 ((irb->scsw.stctl == 260 (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) && 261 (irb->scsw.actl & SCSW_ACTL_DEVACT) && 262 (irb->scsw.actl & SCSW_ACTL_SCHACT)) || 263 (irb->scsw.actl & SCSW_ACTL_SUSPENDED)) 264 cdev_irb->scsw.cpa = irb->scsw.cpa; 265 /* Accumulate device status, but not the device busy flag. */ 266 cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY; 267 cdev_irb->scsw.dstat |= irb->scsw.dstat; 268 /* Accumulate subchannel status. */ 269 cdev_irb->scsw.cstat |= irb->scsw.cstat; 270 /* Copy residual count if it is valid. */ 271 if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) && 272 (irb->scsw.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) == 0) 273 cdev_irb->scsw.count = irb->scsw.count; 274 275 /* Take care of bits in the extended status word. */ 276 ccw_device_accumulate_esw(cdev, irb); 277 278 /* 279 * Check whether we must issue a SENSE CCW ourselves if there is no 280 * concurrent sense facility installed for the subchannel. 281 * No sense is required if no delayed sense is pending 282 * and we did not get a unit check without sense information. 283 * 284 * Note: We should check for ioinfo[irq]->flags.consns but VM 285 * violates the ESA/390 architecture and doesn't present an 286 * operand exception for virtual devices without concurrent 287 * sense facility available/supported when enabling the 288 * concurrent sense facility. 289 */ 290 if ((cdev_irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && 291 !(cdev_irb->esw.esw0.erw.cons)) 292 cdev->private->flags.dosense = 1; 293 } 294 295 /* 296 * Do a basic sense. 297 */ 298 int 299 ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb) 300 { 301 struct subchannel *sch; 302 303 sch = to_subchannel(cdev->dev.parent); 304 305 /* A sense is required, can we do it now ? */ 306 if ((irb->scsw.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0) 307 /* 308 * we received an Unit Check but we have no final 309 * status yet, therefore we must delay the SENSE 310 * processing. We must not report this intermediate 311 * status to the device interrupt handler. 312 */ 313 return -EBUSY; 314 315 /* 316 * We have ending status but no sense information. Do a basic sense. 317 */ 318 sch = to_subchannel(cdev->dev.parent); 319 sch->sense_ccw.cmd_code = CCW_CMD_BASIC_SENSE; 320 sch->sense_ccw.cda = (__u32) __pa(cdev->private->irb.ecw); 321 sch->sense_ccw.count = SENSE_MAX_COUNT; 322 sch->sense_ccw.flags = CCW_FLAG_SLI; 323 324 return cio_start (sch, &sch->sense_ccw, 0xff); 325 } 326 327 /* 328 * Add information from basic sense to devstat. 329 */ 330 void 331 ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb) 332 { 333 /* 334 * Check if the status pending bit is set in stctl. 335 * If not, the remaining bit have no meaning and we must ignore them. 336 * The esw is not meaningful as well... 337 */ 338 if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND)) 339 return; 340 341 /* Check for channel checks and interface control checks. */ 342 ccw_device_msg_control_check(cdev, irb); 343 344 /* Check for path not operational. */ 345 if (irb->scsw.pno && irb->scsw.fctl != 0 && 346 (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) || 347 (irb->scsw.actl & SCSW_ACTL_SUSPENDED))) 348 ccw_device_path_notoper(cdev); 349 350 if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && 351 (irb->scsw.dstat & DEV_STAT_CHN_END)) { 352 cdev->private->irb.esw.esw0.erw.cons = 1; 353 cdev->private->flags.dosense = 0; 354 } 355 /* Check if path verification is required. */ 356 if (ccw_device_accumulate_esw_valid(irb) && 357 irb->esw.esw0.erw.pvrf && cdev->private->options.pgroup) 358 cdev->private->flags.doverify = 1; 359 } 360 361 /* 362 * This function accumulates the status into the private devstat and 363 * starts a basic sense if one is needed. 364 */ 365 int 366 ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb) 367 { 368 ccw_device_accumulate_irb(cdev, irb); 369 if ((irb->scsw.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0) 370 return -EBUSY; 371 /* Check for basic sense. */ 372 if (cdev->private->flags.dosense && 373 !(irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) { 374 cdev->private->irb.esw.esw0.erw.cons = 1; 375 cdev->private->flags.dosense = 0; 376 return 0; 377 } 378 if (cdev->private->flags.dosense) { 379 ccw_device_do_sense(cdev, irb); 380 return -EBUSY; 381 } 382 return 0; 383 } 384 385