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