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 #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);