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