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 #include <asm/diag.h> 21 22 #include "cio.h" 23 #include "cio_debug.h" 24 #include "css.h" 25 #include "device.h" 26 #include "ioasm.h" 27 #include "io_sch.h" 28 29 /* 30 * Input : 31 * devno - device number 32 * ps - pointer to sense ID data area 33 * Output : none 34 */ 35 static void 36 VM_virtual_device_info (__u16 devno, struct senseid *ps) 37 { 38 static struct { 39 int vrdcvcla, vrdcvtyp, cu_type; 40 } vm_devices[] = { 41 { 0x08, 0x01, 0x3480 }, 42 { 0x08, 0x02, 0x3430 }, 43 { 0x08, 0x10, 0x3420 }, 44 { 0x08, 0x42, 0x3424 }, 45 { 0x08, 0x44, 0x9348 }, 46 { 0x08, 0x81, 0x3490 }, 47 { 0x08, 0x82, 0x3422 }, 48 { 0x10, 0x41, 0x1403 }, 49 { 0x10, 0x42, 0x3211 }, 50 { 0x10, 0x43, 0x3203 }, 51 { 0x10, 0x45, 0x3800 }, 52 { 0x10, 0x47, 0x3262 }, 53 { 0x10, 0x48, 0x3820 }, 54 { 0x10, 0x49, 0x3800 }, 55 { 0x10, 0x4a, 0x4245 }, 56 { 0x10, 0x4b, 0x4248 }, 57 { 0x10, 0x4d, 0x3800 }, 58 { 0x10, 0x4e, 0x3820 }, 59 { 0x10, 0x4f, 0x3820 }, 60 { 0x10, 0x82, 0x2540 }, 61 { 0x10, 0x84, 0x3525 }, 62 { 0x20, 0x81, 0x2501 }, 63 { 0x20, 0x82, 0x2540 }, 64 { 0x20, 0x84, 0x3505 }, 65 { 0x40, 0x01, 0x3278 }, 66 { 0x40, 0x04, 0x3277 }, 67 { 0x40, 0x80, 0x2250 }, 68 { 0x40, 0xc0, 0x5080 }, 69 { 0x80, 0x00, 0x3215 }, 70 }; 71 struct diag210 diag_data; 72 int ccode, i; 73 74 CIO_TRACE_EVENT (4, "VMvdinf"); 75 76 diag_data = (struct diag210) { 77 .vrdcdvno = devno, 78 .vrdclen = sizeof (diag_data), 79 }; 80 81 ccode = diag210 (&diag_data); 82 ps->reserved = 0xff; 83 84 /* Special case for bloody osa devices. */ 85 if (diag_data.vrdcvcla == 0x02 && 86 diag_data.vrdcvtyp == 0x20) { 87 ps->cu_type = 0x3088; 88 ps->cu_model = 0x60; 89 return; 90 } 91 for (i = 0; i < ARRAY_SIZE(vm_devices); i++) 92 if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla && 93 diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) { 94 ps->cu_type = vm_devices[i].cu_type; 95 return; 96 } 97 CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):" 98 "vdev class : %02X, vdev type : %04X \n ... " 99 "rdev class : %02X, rdev type : %04X, " 100 "rdev model: %02X\n", 101 devno, ccode, 102 diag_data.vrdcvcla, diag_data.vrdcvtyp, 103 diag_data.vrdcrccl, diag_data.vrdccrty, 104 diag_data.vrdccrmd); 105 } 106 107 /* 108 * Start Sense ID helper function. 109 * Try to obtain the 'control unit'/'device type' information 110 * associated with the subchannel. 111 */ 112 static int 113 __ccw_device_sense_id_start(struct ccw_device *cdev) 114 { 115 struct subchannel *sch; 116 struct ccw1 *ccw; 117 int ret; 118 119 sch = to_subchannel(cdev->dev.parent); 120 /* Setup sense channel program. */ 121 ccw = cdev->private->iccws; 122 ccw->cmd_code = CCW_CMD_SENSE_ID; 123 ccw->cda = (__u32) __pa (&cdev->private->senseid); 124 ccw->count = sizeof (struct senseid); 125 ccw->flags = CCW_FLAG_SLI; 126 127 /* Reset device status. */ 128 memset(&cdev->private->irb, 0, sizeof(struct irb)); 129 130 /* Try on every path. */ 131 ret = -ENODEV; 132 while (cdev->private->imask != 0) { 133 if ((sch->opm & cdev->private->imask) != 0 && 134 cdev->private->iretry > 0) { 135 cdev->private->iretry--; 136 /* Reset internal retry indication. */ 137 cdev->private->flags.intretry = 0; 138 ret = cio_start (sch, cdev->private->iccws, 139 cdev->private->imask); 140 /* ret is 0, -EBUSY, -EACCES or -ENODEV */ 141 if (ret != -EACCES) 142 return ret; 143 } 144 cdev->private->imask >>= 1; 145 cdev->private->iretry = 5; 146 } 147 return ret; 148 } 149 150 void 151 ccw_device_sense_id_start(struct ccw_device *cdev) 152 { 153 int ret; 154 155 memset (&cdev->private->senseid, 0, sizeof (struct senseid)); 156 cdev->private->senseid.cu_type = 0xFFFF; 157 cdev->private->imask = 0x80; 158 cdev->private->iretry = 5; 159 ret = __ccw_device_sense_id_start(cdev); 160 if (ret && ret != -EBUSY) 161 ccw_device_sense_id_done(cdev, ret); 162 } 163 164 /* 165 * Called from interrupt context to check if a valid answer 166 * to Sense ID was received. 167 */ 168 static int 169 ccw_device_check_sense_id(struct ccw_device *cdev) 170 { 171 struct subchannel *sch; 172 struct irb *irb; 173 174 sch = to_subchannel(cdev->dev.parent); 175 irb = &cdev->private->irb; 176 /* Did we get a proper answer ? */ 177 if (cdev->private->senseid.cu_type != 0xFFFF && 178 cdev->private->senseid.reserved == 0xFF) { 179 if (irb->scsw.count < sizeof (struct senseid) - 8) 180 cdev->private->flags.esid = 1; 181 return 0; /* Success */ 182 } 183 /* Check the error cases. */ 184 if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) { 185 /* Retry Sense ID if requested. */ 186 if (cdev->private->flags.intretry) { 187 cdev->private->flags.intretry = 0; 188 return -EAGAIN; 189 } 190 return -ETIME; 191 } 192 if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) { 193 /* 194 * if the device doesn't support the SenseID 195 * command further retries wouldn't help ... 196 * NB: We don't check here for intervention required like we 197 * did before, because tape devices with no tape inserted 198 * may present this status *in conjunction with* the 199 * sense id information. So, for intervention required, 200 * we use the "whack it until it talks" strategy... 201 */ 202 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel " 203 "0.%x.%04x reports cmd reject\n", 204 cdev->private->dev_id.devno, sch->schid.ssid, 205 sch->schid.sch_no); 206 return -EOPNOTSUPP; 207 } 208 if (irb->esw.esw0.erw.cons) { 209 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, " 210 "lpum %02X, cnt %02d, sns :" 211 " %02X%02X%02X%02X %02X%02X%02X%02X ...\n", 212 cdev->private->dev_id.ssid, 213 cdev->private->dev_id.devno, 214 irb->esw.esw0.sublog.lpum, 215 irb->esw.esw0.erw.scnt, 216 irb->ecw[0], irb->ecw[1], 217 irb->ecw[2], irb->ecw[3], 218 irb->ecw[4], irb->ecw[5], 219 irb->ecw[6], irb->ecw[7]); 220 return -EAGAIN; 221 } 222 if (irb->scsw.cc == 3) { 223 u8 lpm; 224 225 lpm = to_io_private(sch)->orb.lpm; 226 if ((lpm & sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0) 227 CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x " 228 "on subchannel 0.%x.%04x is " 229 "'not operational'\n", lpm, 230 cdev->private->dev_id.devno, 231 sch->schid.ssid, sch->schid.sch_no); 232 return -EACCES; 233 } 234 /* Hmm, whatever happened, try again. */ 235 CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on " 236 "subchannel 0.%x.%04x returns status %02X%02X\n", 237 cdev->private->dev_id.devno, sch->schid.ssid, 238 sch->schid.sch_no, 239 irb->scsw.dstat, irb->scsw.cstat); 240 return -EAGAIN; 241 } 242 243 /* 244 * Got interrupt for Sense ID. 245 */ 246 void 247 ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event) 248 { 249 struct subchannel *sch; 250 struct irb *irb; 251 int ret; 252 253 sch = to_subchannel(cdev->dev.parent); 254 irb = (struct irb *) __LC_IRB; 255 /* Retry sense id, if needed. */ 256 if (irb->scsw.stctl == 257 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { 258 if ((irb->scsw.cc == 1) || !irb->scsw.actl) { 259 ret = __ccw_device_sense_id_start(cdev); 260 if (ret && ret != -EBUSY) 261 ccw_device_sense_id_done(cdev, ret); 262 } 263 return; 264 } 265 if (ccw_device_accumulate_and_sense(cdev, irb) != 0) 266 return; 267 ret = ccw_device_check_sense_id(cdev); 268 memset(&cdev->private->irb, 0, sizeof(struct irb)); 269 switch (ret) { 270 /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */ 271 case 0: /* Sense id succeeded. */ 272 case -ETIME: /* Sense id stopped by timeout. */ 273 ccw_device_sense_id_done(cdev, ret); 274 break; 275 case -EACCES: /* channel is not operational. */ 276 sch->lpm &= ~cdev->private->imask; 277 cdev->private->imask >>= 1; 278 cdev->private->iretry = 5; 279 /* fall through. */ 280 case -EAGAIN: /* try again. */ 281 ret = __ccw_device_sense_id_start(cdev); 282 if (ret == 0 || ret == -EBUSY) 283 break; 284 /* fall through. */ 285 default: /* Sense ID failed. Try asking VM. */ 286 if (MACHINE_IS_VM) { 287 VM_virtual_device_info (cdev->private->dev_id.devno, 288 &cdev->private->senseid); 289 if (cdev->private->senseid.cu_type != 0xFFFF) { 290 /* Got the device information from VM. */ 291 ccw_device_sense_id_done(cdev, 0); 292 return; 293 } 294 } 295 /* 296 * If we can't couldn't identify the device type we 297 * consider the device "not operational". 298 */ 299 ccw_device_sense_id_done(cdev, -ENODEV); 300 break; 301 } 302 } 303