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 #include <asm/diag.h>
  21
  22 #include "cio.h"
  23 #include "cio_debug.h"
  24 #include "css.h"
  25 #include "device.h"
  26 #include "ioasm.h"
  27
  28 /*
  29  * Input :
  30  *   devno - device number
  31  *   ps    - pointer to sense ID data area
  32  * Output : none
  33  */
  34 static void
  35 VM_virtual_device_info (__u16 devno, struct senseid *ps)
  36 {
  37         static struct {
  38                 int vrdcvcla, vrdcvtyp, cu_type;
  39         } vm_devices[] = {
  40                 { 0x08, 0x01, 0x3480 },
  41                 { 0x08, 0x02, 0x3430 },
  42                 { 0x08, 0x10, 0x3420 },
  43                 { 0x08, 0x42, 0x3424 },
  44                 { 0x08, 0x44, 0x9348 },
  45                 { 0x08, 0x81, 0x3490 },
  46                 { 0x08, 0x82, 0x3422 },
  47                 { 0x10, 0x41, 0x1403 },
  48                 { 0x10, 0x42, 0x3211 },
  49                 { 0x10, 0x43, 0x3203 },
  50                 { 0x10, 0x45, 0x3800 },
  51                 { 0x10, 0x47, 0x3262 },
  52                 { 0x10, 0x48, 0x3820 },
  53                 { 0x10, 0x49, 0x3800 },
  54                 { 0x10, 0x4a, 0x4245 },
  55                 { 0x10, 0x4b, 0x4248 },
  56                 { 0x10, 0x4d, 0x3800 },
  57                 { 0x10, 0x4e, 0x3820 },
  58                 { 0x10, 0x4f, 0x3820 },
  59                 { 0x10, 0x82, 0x2540 },
  60                 { 0x10, 0x84, 0x3525 },
  61                 { 0x20, 0x81, 0x2501 },
  62                 { 0x20, 0x82, 0x2540 },
  63                 { 0x20, 0x84, 0x3505 },
  64                 { 0x40, 0x01, 0x3278 },
  65                 { 0x40, 0x04, 0x3277 },
  66                 { 0x40, 0x80, 0x2250 },
  67                 { 0x40, 0xc0, 0x5080 },
  68                 { 0x80, 0x00, 0x3215 },
  69         };
  70         struct diag210 diag_data;
  71         int ccode, i;
  72
  73         CIO_TRACE_EVENT (4, "VMvdinf");
  74
  75         diag_data = (struct diag210) {
  76                 .vrdcdvno = devno,
  77                 .vrdclen = sizeof (diag_data),
  78         };
  79
  80         ccode = diag210 (&diag_data);
  81         ps->reserved = 0xff;
  82
  83         /* Special case for bloody osa devices. */
  84         if (diag_data.vrdcvcla == 0x02 &&
  85             diag_data.vrdcvtyp == 0x20) {
  86                 ps->cu_type = 0x3088;
  87                 ps->cu_model = 0x60;
  88                 return;
  89         }
  90         for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
  91                 if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla &&
  92                     diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) {
  93                         ps->cu_type = vm_devices[i].cu_type;
  94                         return;
  95                 }
  96         CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
  97                       "vdev class : %02X, vdev type : %04X \n ...  "
  98                       "rdev class : %02X, rdev type : %04X, "
  99                       "rdev model: %02X\n",
 100                       devno, ccode,
 101                       diag_data.vrdcvcla, diag_data.vrdcvtyp,
 102                       diag_data.vrdcrccl, diag_data.vrdccrty,
 103                       diag_data.vrdccrmd);
 104 }
 105
 106 /*
 107  * Start Sense ID helper function.
 108  * Try to obtain the 'control unit'/'device type' information
 109  *  associated with the subchannel.
 110  */
 111 static int
 112 __ccw_device_sense_id_start(struct ccw_device *cdev)
 113 {
 114         struct subchannel *sch;
 115         struct ccw1 *ccw;
 116         int ret;
 117
 118         sch = to_subchannel(cdev->dev.parent);
 119         /* Setup sense channel program. */
 120         ccw = cdev->private->iccws;
 121         ccw->cmd_code = CCW_CMD_SENSE_ID;
 122         ccw->cda = (__u32) __pa (&cdev->private->senseid);
 123         ccw->count = sizeof (struct senseid);
 124         ccw->flags = CCW_FLAG_SLI;
 125
 126         /* Reset device status. */
 127         memset(&cdev->private->irb, 0, sizeof(struct irb));
 128
 129         /* Try on every path. */
 130         ret = -ENODEV;
 131         while (cdev->private->imask != 0) {
 132                 if ((sch->opm & cdev->private->imask) != 0 &&
 133                     cdev->private->iretry > 0) {
 134                         cdev->private->iretry--;
 135                         /* Reset internal retry indication. */
 136                         cdev->private->flags.intretry = 0;
 137                         ret = cio_start (sch, cdev->private->iccws,
 138                                          cdev->private->imask);
 139                         /* ret is 0, -EBUSY, -EACCES or -ENODEV */
 140                         if (ret != -EACCES)
 141                                 return ret;
 142                 }
 143                 cdev->private->imask >>= 1;
 144                 cdev->private->iretry = 5;
 145         }
 146         return ret;
 147 }
 148
 149 void
 150 ccw_device_sense_id_start(struct ccw_device *cdev)
 151 {
 152         int ret;
 153
 154         memset (&cdev->private->senseid, 0, sizeof (struct senseid));
 155         cdev->private->senseid.cu_type = 0xFFFF;
 156         cdev->private->imask = 0x80;
 157         cdev->private->iretry = 5;
 158         ret = __ccw_device_sense_id_start(cdev);
 159         if (ret && ret != -EBUSY)
 160                 ccw_device_sense_id_done(cdev, ret);
 161 }
 162
 163 /*
 164  * Called from interrupt context to check if a valid answer
 165  * to Sense ID was received.
 166  */
 167 static int
 168 ccw_device_check_sense_id(struct ccw_device *cdev)
 169 {
 170         struct subchannel *sch;
 171         struct irb *irb;
 172
 173         sch = to_subchannel(cdev->dev.parent);
 174         irb = &cdev->private->irb;
 175         /* Did we get a proper answer ? */
 176         if (cdev->private->senseid.cu_type != 0xFFFF &&
 177             cdev->private->senseid.reserved == 0xFF) {
 178                 if (irb->scsw.count < sizeof (struct senseid) - 8)
 179                         cdev->private->flags.esid = 1;
 180                 return 0; /* Success */
 181         }
 182         /* Check the error cases. */
 183         if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
 184                 /* Retry Sense ID if requested. */
 185                 if (cdev->private->flags.intretry) {
 186                         cdev->private->flags.intretry = 0;
 187                         return -EAGAIN;
 188                 }
 189                 return -ETIME;
 190         }
 191         if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
 192                 /*
 193                  * if the device doesn't support the SenseID
 194                  *  command further retries wouldn't help ...
 195                  * NB: We don't check here for intervention required like we
 196                  *     did before, because tape devices with no tape inserted
 197                  *     may present this status *in conjunction with* the
 198                  *     sense id information. So, for intervention required,
 199                  *     we use the "whack it until it talks" strategy...
 200                  */
 201                 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel "
 202                               "0.%x.%04x reports cmd reject\n",
 203                               cdev->private->dev_id.devno, sch->schid.ssid,
 204                               sch->schid.sch_no);
 205                 return -EOPNOTSUPP;
 206         }
 207         if (irb->esw.esw0.erw.cons) {
 208                 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
 209                               "lpum %02X, cnt %02d, sns :"
 210                               " %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
 211                               cdev->private->dev_id.ssid,
 212                               cdev->private->dev_id.devno,
 213                               irb->esw.esw0.sublog.lpum,
 214                               irb->esw.esw0.erw.scnt,
 215                               irb->ecw[0], irb->ecw[1],
 216                               irb->ecw[2], irb->ecw[3],
 217                               irb->ecw[4], irb->ecw[5],
 218                               irb->ecw[6], irb->ecw[7]);
 219                 return -EAGAIN;
 220         }
 221         if (irb->scsw.cc == 3) {
 222                 if ((sch->orb.lpm &
 223                      sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
 224                         CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x "
 225                                       "on subchannel 0.%x.%04x is "
 226                                       "'not operational'\n", sch->orb.lpm,
 227                                       cdev->private->dev_id.devno,
 228                                       sch->schid.ssid, sch->schid.sch_no);
 229                 return -EACCES;
 230         }
 231         /* Hmm, whatever happened, try again. */
 232         CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
 233                       "subchannel 0.%x.%04x returns status %02X%02X\n",
 234                       cdev->private->dev_id.devno, sch->schid.ssid,
 235                       sch->schid.sch_no,
 236                       irb->scsw.dstat, irb->scsw.cstat);
 237         return -EAGAIN;
 238 }
 239
 240 /*
 241  * Got interrupt for Sense ID.
 242  */
 243 void
 244 ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
 245 {
 246         struct subchannel *sch;
 247         struct irb *irb;
 248         int ret;
 249
 250         sch = to_subchannel(cdev->dev.parent);
 251         irb = (struct irb *) __LC_IRB;
 252         /* Retry sense id, if needed. */
 253         if (irb->scsw.stctl ==
 254             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 255                 if ((irb->scsw.cc == 1) || !irb->scsw.actl) {
 256                         ret = __ccw_device_sense_id_start(cdev);
 257                         if (ret && ret != -EBUSY)
 258                                 ccw_device_sense_id_done(cdev, ret);
 259                 }
 260                 return;
 261         }
 262         if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
 263                 return;
 264         ret = ccw_device_check_sense_id(cdev);
 265         memset(&cdev->private->irb, 0, sizeof(struct irb));
 266         switch (ret) {
 267         /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
 268         case 0:                 /* Sense id succeeded. */
 269         case -ETIME:            /* Sense id stopped by timeout. */
 270                 ccw_device_sense_id_done(cdev, ret);
 271                 break;
 272         case -EACCES:           /* channel is not operational. */
 273                 sch->lpm &= ~cdev->private->imask;
 274                 cdev->private->imask >>= 1;
 275                 cdev->private->iretry = 5;
 276                 /* fall through. */
 277         case -EAGAIN:           /* try again. */
 278                 ret = __ccw_device_sense_id_start(cdev);
 279                 if (ret == 0 || ret == -EBUSY)
 280                         break;
 281                 /* fall through. */
 282         default:                /* Sense ID failed. Try asking VM. */
 283                 if (MACHINE_IS_VM) {
 284                         VM_virtual_device_info (cdev->private->dev_id.devno,
 285                                                 &cdev->private->senseid);
 286                         if (cdev->private->senseid.cu_type != 0xFFFF) {
 287                                 /* Got the device information from VM. */
 288                                 ccw_device_sense_id_done(cdev, 0);
 289                                 return;
 290                         }
 291                 }
 292                 /*
 293                  * If we can't couldn't identify the device type we
 294                  *  consider the device "not operational".
 295                  */
 296                 ccw_device_sense_id_done(cdev, -ENODEV);
 297                 break;
 298         }
 299 }