1 /* 2 * drivers/s390/cio/device_id.c 3 * 4 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, 5 * IBM Corporation 6 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Sense ID functions. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 16 #include <asm/ccwdev.h> 17 #include <asm/delay.h> 18 #include <asm/cio.h> 19 #include <asm/lowcore.h> 20 21 #include "cio.h" 22 #include "cio_debug.h" 23 #include "css.h" 24 #include "device.h" 25 #include "ioasm.h" 26 27 /* 28 * diag210 is used under VM to get information about a virtual device 29 */ 30 #ifdef CONFIG_64BIT 31 int 32 diag210(struct diag210 * addr) 33 { 34 /* 35 * diag 210 needs its data below the 2GB border, so we 36 * use a static data area to be sure 37 */ 38 static struct diag210 diag210_tmp; 39 static DEFINE_SPINLOCK(diag210_lock); 40 unsigned long flags; 41 int ccode; 42 43 spin_lock_irqsave(&diag210_lock, flags); 44 diag210_tmp = *addr; 45 46 asm volatile( 47 " lhi %0,-1\n" 48 " sam31\n" 49 " diag %1,0,0x210\n" 50 "0: ipm %0\n" 51 " srl %0,28\n" 52 "1: sam64\n" 53 EX_TABLE(0b,1b) 54 : "=&d" (ccode) : "a" (__pa(&diag210_tmp)) : "cc", "memory"); 55 56 *addr = diag210_tmp; 57 spin_unlock_irqrestore(&diag210_lock, flags); 58 59 return ccode; 60 } 61 #else 62 int 63 diag210(struct diag210 * addr) 64 { 65 int ccode; 66 67 asm volatile( 68 " lhi %0,-1\n" 69 " diag %1,0,0x210\n" 70 "0: ipm %0\n" 71 " srl %0,28\n" 72 "1:\n" 73 EX_TABLE(0b,1b) 74 : "=&d" (ccode) : "a" (__pa(addr)) : "cc", "memory"); 75 76 return ccode; 77 } 78 #endif 79 80 /* 81 * Input : 82 * devno - device number 83 * ps - pointer to sense ID data area 84 * Output : none 85 */ 86 static void 87 VM_virtual_device_info (__u16 devno, struct senseid *ps) 88 { 89 static struct { 90 int vrdcvcla, vrdcvtyp, cu_type; 91 } vm_devices[] = { 92 { 0x08, 0x01, 0x3480 }, 93 { 0x08, 0x02, 0x3430 }, 94 { 0x08, 0x10, 0x3420 }, 95 { 0x08, 0x42, 0x3424 }, 96 { 0x08, 0x44, 0x9348 }, 97 { 0x08, 0x81, 0x3490 }, 98 { 0x08, 0x82, 0x3422 }, 99 { 0x10, 0x41, 0x1403 }, 100 { 0x10, 0x42, 0x3211 }, 101 { 0x10, 0x43, 0x3203 }, 102 { 0x10, 0x45, 0x3800 }, 103 { 0x10, 0x47, 0x3262 }, 104 { 0x10, 0x48, 0x3820 }, 105 { 0x10, 0x49, 0x3800 }, 106 { 0x10, 0x4a, 0x4245 }, 107 { 0x10, 0x4b, 0x4248 }, 108 { 0x10, 0x4d, 0x3800 }, 109 { 0x10, 0x4e, 0x3820 }, 110 { 0x10, 0x4f, 0x3820 }, 111 { 0x10, 0x82, 0x2540 }, 112 { 0x10, 0x84, 0x3525 }, 113 { 0x20, 0x81, 0x2501 }, 114 { 0x20, 0x82, 0x2540 }, 115 { 0x20, 0x84, 0x3505 }, 116 { 0x40, 0x01, 0x3278 }, 117 { 0x40, 0x04, 0x3277 }, 118 { 0x40, 0x80, 0x2250 }, 119 { 0x40, 0xc0, 0x5080 }, 120 { 0x80, 0x00, 0x3215 }, 121 }; 122 struct diag210 diag_data; 123 int ccode, i; 124 125 CIO_TRACE_EVENT (4, "VMvdinf"); 126 127 diag_data = (struct diag210) { 128 .vrdcdvno = devno, 129 .vrdclen = sizeof (diag_data), 130 }; 131 132 ccode = diag210 (&diag_data); 133 ps->reserved = 0xff; 134 135 /* Special case for bloody osa devices. */ 136 if (diag_data.vrdcvcla == 0x02 && 137 diag_data.vrdcvtyp == 0x20) { 138 ps->cu_type = 0x3088; 139 ps->cu_model = 0x60; 140 return; 141 } 142 for (i = 0; i < ARRAY_SIZE(vm_devices); i++) 143 if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla && 144 diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) { 145 ps->cu_type = vm_devices[i].cu_type; 146 return; 147 } 148 CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):" 149 "vdev class : %02X, vdev type : %04X \n ... " 150 "rdev class : %02X, rdev type : %04X, " 151 "rdev model: %02X\n", 152 devno, ccode, 153 diag_data.vrdcvcla, diag_data.vrdcvtyp, 154 diag_data.vrdcrccl, diag_data.vrdccrty, 155 diag_data.vrdccrmd); 156 } 157 158 /* 159 * Start Sense ID helper function. 160 * Try to obtain the 'control unit'/'device type' information 161 * associated with the subchannel. 162 */ 163 static int 164 __ccw_device_sense_id_start(struct ccw_device *cdev) 165 { 166 struct subchannel *sch; 167 struct ccw1 *ccw; 168 int ret; 169 170 sch = to_subchannel(cdev->dev.parent); 171 /* Setup sense channel program. */ 172 ccw = cdev->private->iccws; 173 if (sch->schib.pmcw.pim != 0x80) { 174 /* more than one path installed. */ 175 ccw->cmd_code = CCW_CMD_SUSPEND_RECONN; 176 ccw->cda = 0; 177 ccw->count = 0; 178 ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC; 179 ccw++; 180 } 181 ccw->cmd_code = CCW_CMD_SENSE_ID; 182 ccw->cda = (__u32) __pa (&cdev->private->senseid); 183 ccw->count = sizeof (struct senseid); 184 ccw->flags = CCW_FLAG_SLI; 185 186 /* Reset device status. */ 187 memset(&cdev->private->irb, 0, sizeof(struct irb)); 188 189 /* Try on every path. */ 190 ret = -ENODEV; 191 while (cdev->private->imask != 0) { 192 if ((sch->opm & cdev->private->imask) != 0 && 193 cdev->private->iretry > 0) { 194 cdev->private->iretry--; 195 /* Reset internal retry indication. */ 196 cdev->private->flags.intretry = 0; 197 ret = cio_start (sch, cdev->private->iccws, 198 cdev->private->imask); 199 /* ret is 0, -EBUSY, -EACCES or -ENODEV */ 200 if (ret != -EACCES) 201 return ret; 202 } 203 cdev->private->imask >>= 1; 204 cdev->private->iretry = 5; 205 } 206 return ret; 207 } 208 209 void 210 ccw_device_sense_id_start(struct ccw_device *cdev) 211 { 212 int ret; 213 214 memset (&cdev->private->senseid, 0, sizeof (struct senseid)); 215 cdev->private->senseid.cu_type = 0xFFFF; 216 cdev->private->imask = 0x80; 217 cdev->private->iretry = 5; 218 ret = __ccw_device_sense_id_start(cdev); 219 if (ret && ret != -EBUSY) 220 ccw_device_sense_id_done(cdev, ret); 221 } 222 223 /* 224 * Called from interrupt context to check if a valid answer 225 * to Sense ID was received. 226 */ 227 static int 228 ccw_device_check_sense_id(struct ccw_device *cdev) 229 { 230 struct subchannel *sch; 231 struct irb *irb; 232 233 sch = to_subchannel(cdev->dev.parent); 234 irb = &cdev->private->irb; 235 /* Did we get a proper answer ? */ 236 if (cdev->private->senseid.cu_type != 0xFFFF && 237 cdev->private->senseid.reserved == 0xFF) { 238 if (irb->scsw.count < sizeof (struct senseid) - 8) 239 cdev->private->flags.esid = 1; 240 return 0; /* Success */ 241 } 242 /* Check the error cases. */ 243 if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) { 244 /* Retry Sense ID if requested. */ 245 if (cdev->private->flags.intretry) { 246 cdev->private->flags.intretry = 0; 247 return -EAGAIN; 248 } 249 return -ETIME; 250 } 251 if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) { 252 /* 253 * if the device doesn't support the SenseID 254 * command further retries wouldn't help ... 255 * NB: We don't check here for intervention required like we 256 * did before, because tape devices with no tape inserted 257 * may present this status *in conjunction with* the 258 * sense id information. So, for intervention required, 259 * we use the "whack it until it talks" strategy... 260 */ 261 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel " 262 "0.%x.%04x reports cmd reject\n", 263 cdev->private->dev_id.devno, sch->schid.ssid, 264 sch->schid.sch_no); 265 return -EOPNOTSUPP; 266 } 267 if (irb->esw.esw0.erw.cons) { 268 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, " 269 "lpum %02X, cnt %02d, sns :" 270 " %02X%02X%02X%02X %02X%02X%02X%02X ...\n", 271 cdev->private->dev_id.ssid, 272 cdev->private->dev_id.devno, 273 irb->esw.esw0.sublog.lpum, 274 irb->esw.esw0.erw.scnt, 275 irb->ecw[0], irb->ecw[1], 276 irb->ecw[2], irb->ecw[3], 277 irb->ecw[4], irb->ecw[5], 278 irb->ecw[6], irb->ecw[7]); 279 return -EAGAIN; 280 } 281 if (irb->scsw.cc == 3) { 282 if ((sch->orb.lpm & 283 sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0) 284 CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x " 285 "on subchannel 0.%x.%04x is " 286 "'not operational'\n", sch->orb.lpm, 287 cdev->private->dev_id.devno, 288 sch->schid.ssid, sch->schid.sch_no); 289 return -EACCES; 290 } 291 /* Hmm, whatever happened, try again. */ 292 CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on " 293 "subchannel 0.%x.%04x returns status %02X%02X\n", 294 cdev->private->dev_id.devno, sch->schid.ssid, 295 sch->schid.sch_no, 296 irb->scsw.dstat, irb->scsw.cstat); 297 return -EAGAIN; 298 } 299 300 /* 301 * Got interrupt for Sense ID. 302 */ 303 void 304 ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event) 305 { 306 struct subchannel *sch; 307 struct irb *irb; 308 int ret; 309 310 sch = to_subchannel(cdev->dev.parent); 311 irb = (struct irb *) __LC_IRB; 312 /* Retry sense id, if needed. */ 313 if (irb->scsw.stctl == 314 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 315 if ((irb->scsw.cc == 1) || !irb->scsw.actl) { 316 ret = __ccw_device_sense_id_start(cdev); 317 if (ret && ret != -EBUSY) 318 ccw_device_sense_id_done(cdev, ret); 319 } 320 return; 321 } 322 if (ccw_device_accumulate_and_sense(cdev, irb) != 0) 323 return; 324 ret = ccw_device_check_sense_id(cdev); 325 memset(&cdev->private->irb, 0, sizeof(struct irb)); 326 switch (ret) { 327 /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */ 328 case 0: /* Sense id succeeded. */ 329 case -ETIME: /* Sense id stopped by timeout. */ 330 ccw_device_sense_id_done(cdev, ret); 331 break; 332 case -EACCES: /* channel is not operational. */ 333 sch->lpm &= ~cdev->private->imask; 334 cdev->private->imask >>= 1; 335 cdev->private->iretry = 5; 336 /* fall through. */ 337 case -EAGAIN: /* try again. */ 338 ret = __ccw_device_sense_id_start(cdev); 339 if (ret == 0 || ret == -EBUSY) 340 break; 341 /* fall through. */ 342 default: /* Sense ID failed. Try asking VM. */ 343 if (MACHINE_IS_VM) { 344 VM_virtual_device_info (cdev->private->dev_id.devno, 345 &cdev->private->senseid); 346 if (cdev->private->senseid.cu_type != 0xFFFF) { 347 /* Got the device information from VM. */ 348 ccw_device_sense_id_done(cdev, 0); 349 return; 350 } 351 } 352 /* 353 * If we can't couldn't identify the device type we 354 * consider the device "not operational". 355 */ 356 ccw_device_sense_id_done(cdev, -ENODEV); 357 break; 358 } 359 } 360 361 EXPORT_SYMBOL(diag210); 362