drivers/s390/cio/device_id.c

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