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         if (sch->schib.pmcw.pim != 0x80) {
 122                 /* more than one path installed. */
 123                 ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
 124                 ccw->cda = 0;
 125                 ccw->count = 0;
 126                 ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
 127                 ccw++;
 128         }
 129         ccw->cmd_code = CCW_CMD_SENSE_ID;
 130         ccw->cda = (__u32) __pa (&cdev->private->senseid);
 131         ccw->count = sizeof (struct senseid);
 132         ccw->flags = CCW_FLAG_SLI;
 133
 134         /* Reset device status. */
 135         memset(&cdev->private->irb, 0, sizeof(struct irb));
 136
 137         /* Try on every path. */
 138         ret = -ENODEV;
 139         while (cdev->private->imask != 0) {
 140                 if ((sch->opm & cdev->private->imask) != 0 &&
 141                     cdev->private->iretry > 0) {
 142                         cdev->private->iretry--;
 143                         /* Reset internal retry indication. */
 144                         cdev->private->flags.intretry = 0;
 145                         ret = cio_start (sch, cdev->private->iccws,
 146                                          cdev->private->imask);
 147                         /* ret is 0, -EBUSY, -EACCES or -ENODEV */
 148                         if (ret != -EACCES)
 149                                 return ret;
 150                 }
 151                 cdev->private->imask >>= 1;
 152                 cdev->private->iretry = 5;
 153         }
 154         return ret;
 155 }
 156
 157 void
 158 ccw_device_sense_id_start(struct ccw_device *cdev)
 159 {
 160         int ret;
 161
 162         memset (&cdev->private->senseid, 0, sizeof (struct senseid));
 163         cdev->private->senseid.cu_type = 0xFFFF;
 164         cdev->private->imask = 0x80;
 165         cdev->private->iretry = 5;
 166         ret = __ccw_device_sense_id_start(cdev);
 167         if (ret && ret != -EBUSY)
 168                 ccw_device_sense_id_done(cdev, ret);
 169 }
 170
 171 /*
 172  * Called from interrupt context to check if a valid answer
 173  * to Sense ID was received.
 174  */
 175 static int
 176 ccw_device_check_sense_id(struct ccw_device *cdev)
 177 {
 178         struct subchannel *sch;
 179         struct irb *irb;
 180
 181         sch = to_subchannel(cdev->dev.parent);
 182         irb = &cdev->private->irb;
 183         /* Did we get a proper answer ? */
 184         if (cdev->private->senseid.cu_type != 0xFFFF &&
 185             cdev->private->senseid.reserved == 0xFF) {
 186                 if (irb->scsw.count < sizeof (struct senseid) - 8)
 187                         cdev->private->flags.esid = 1;
 188                 return 0; /* Success */
 189         }
 190         /* Check the error cases. */
 191         if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
 192                 /* Retry Sense ID if requested. */
 193                 if (cdev->private->flags.intretry) {
 194                         cdev->private->flags.intretry = 0;
 195                         return -EAGAIN;
 196                 }
 197                 return -ETIME;
 198         }
 199         if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
 200                 /*
 201                  * if the device doesn't support the SenseID
 202                  *  command further retries wouldn't help ...
 203                  * NB: We don't check here for intervention required like we
 204                  *     did before, because tape devices with no tape inserted
 205                  *     may present this status *in conjunction with* the
 206                  *     sense id information. So, for intervention required,
 207                  *     we use the "whack it until it talks" strategy...
 208                  */
 209                 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel "
 210                               "0.%x.%04x reports cmd reject\n",
 211                               cdev->private->dev_id.devno, sch->schid.ssid,
 212                               sch->schid.sch_no);
 213                 return -EOPNOTSUPP;
 214         }
 215         if (irb->esw.esw0.erw.cons) {
 216                 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
 217                               "lpum %02X, cnt %02d, sns :"
 218                               " %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
 219                               cdev->private->dev_id.ssid,
 220                               cdev->private->dev_id.devno,
 221                               irb->esw.esw0.sublog.lpum,
 222                               irb->esw.esw0.erw.scnt,
 223                               irb->ecw[0], irb->ecw[1],
 224                               irb->ecw[2], irb->ecw[3],
 225                               irb->ecw[4], irb->ecw[5],
 226                               irb->ecw[6], irb->ecw[7]);
 227                 return -EAGAIN;
 228         }
 229         if (irb->scsw.cc == 3) {
 230                 if ((sch->orb.lpm &
 231                      sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
 232                         CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x "
 233                                       "on subchannel 0.%x.%04x is "
 234                                       "'not operational'\n", sch->orb.lpm,
 235                                       cdev->private->dev_id.devno,
 236                                       sch->schid.ssid, sch->schid.sch_no);
 237                 return -EACCES;
 238         }
 239         /* Hmm, whatever happened, try again. */
 240         CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
 241                       "subchannel 0.%x.%04x returns status %02X%02X\n",
 242                       cdev->private->dev_id.devno, sch->schid.ssid,
 243                       sch->schid.sch_no,
 244                       irb->scsw.dstat, irb->scsw.cstat);
 245         return -EAGAIN;
 246 }
 247
 248 /*
 249  * Got interrupt for Sense ID.
 250  */
 251 void
 252 ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
 253 {
 254         struct subchannel *sch;
 255         struct irb *irb;
 256         int ret;
 257
 258         sch = to_subchannel(cdev->dev.parent);
 259         irb = (struct irb *) __LC_IRB;
 260         /* Retry sense id, if needed. */
 261         if (irb->scsw.stctl ==
 262             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 263                 if ((irb->scsw.cc == 1) || !irb->scsw.actl) {
 264                         ret = __ccw_device_sense_id_start(cdev);
 265                         if (ret && ret != -EBUSY)
 266                                 ccw_device_sense_id_done(cdev, ret);
 267                 }
 268                 return;
 269         }
 270         if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
 271                 return;
 272         ret = ccw_device_check_sense_id(cdev);
 273         memset(&cdev->private->irb, 0, sizeof(struct irb));
 274         switch (ret) {
 275         /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
 276         case 0:                 /* Sense id succeeded. */
 277         case -ETIME:            /* Sense id stopped by timeout. */
 278                 ccw_device_sense_id_done(cdev, ret);
 279                 break;
 280         case -EACCES:           /* channel is not operational. */
 281                 sch->lpm &= ~cdev->private->imask;
 282                 cdev->private->imask >>= 1;
 283                 cdev->private->iretry = 5;
 284                 /* fall through. */
 285         case -EAGAIN:           /* try again. */
 286                 ret = __ccw_device_sense_id_start(cdev);
 287                 if (ret == 0 || ret == -EBUSY)
 288                         break;
 289                 /* fall through. */
 290         default:                /* Sense ID failed. Try asking VM. */
 291                 if (MACHINE_IS_VM) {
 292                         VM_virtual_device_info (cdev->private->dev_id.devno,
 293                                                 &cdev->private->senseid);
 294                         if (cdev->private->senseid.cu_type != 0xFFFF) {
 295                                 /* Got the device information from VM. */
 296                                 ccw_device_sense_id_done(cdev, 0);
 297                                 return;
 298                         }
 299                 }
 300                 /*
 301                  * If we can't couldn't identify the device type we
 302                  *  consider the device "not operational".
 303                  */
 304                 ccw_device_sense_id_done(cdev, -ENODEV);
 305                 break;
 306         }
 307 }