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