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