release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/s390/cio/device_id.c

   1 /*
   2  *  CCW device SENSE ID I/O handling.
   3  *
   4  *    Copyright IBM Corp. 2002,2009
   5  *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  *               Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/string.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <asm/ccwdev.h>
  15 #include <asm/setup.h>
  16 #include <asm/cio.h>
  17 #include <asm/diag.h>
  18
  19 #include "cio.h"
  20 #include "cio_debug.h"
  21 #include "device.h"
  22 #include "io_sch.h"
  23
  24 #define SENSE_ID_RETRIES        256
  25 #define SENSE_ID_TIMEOUT        (10 * HZ)
  26 #define SENSE_ID_MIN_LEN        4
  27 #define SENSE_ID_BASIC_LEN      7
  28
  29 /**
  30  * diag210_to_senseid - convert diag 0x210 data to sense id information
  31  * @senseid: sense id
  32  * @diag: diag 0x210 data
  33  *
  34  * Return 0 on success, non-zero otherwise.
  35  */
  36 static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
  37 {
  38         static struct {
  39                 int class, type, cu_type;
  40         } vm_devices[] = {
  41                 { 0x08, 0x01, 0x3480 },
  42                 { 0x08, 0x02, 0x3430 },
  43                 { 0x08, 0x10, 0x3420 },
  44                 { 0x08, 0x42, 0x3424 },
  45                 { 0x08, 0x44, 0x9348 },
  46                 { 0x08, 0x81, 0x3490 },
  47                 { 0x08, 0x82, 0x3422 },
  48                 { 0x10, 0x41, 0x1403 },
  49                 { 0x10, 0x42, 0x3211 },
  50                 { 0x10, 0x43, 0x3203 },
  51                 { 0x10, 0x45, 0x3800 },
  52                 { 0x10, 0x47, 0x3262 },
  53                 { 0x10, 0x48, 0x3820 },
  54                 { 0x10, 0x49, 0x3800 },
  55                 { 0x10, 0x4a, 0x4245 },
  56                 { 0x10, 0x4b, 0x4248 },
  57                 { 0x10, 0x4d, 0x3800 },
  58                 { 0x10, 0x4e, 0x3820 },
  59                 { 0x10, 0x4f, 0x3820 },
  60                 { 0x10, 0x82, 0x2540 },
  61                 { 0x10, 0x84, 0x3525 },
  62                 { 0x20, 0x81, 0x2501 },
  63                 { 0x20, 0x82, 0x2540 },
  64                 { 0x20, 0x84, 0x3505 },
  65                 { 0x40, 0x01, 0x3278 },
  66                 { 0x40, 0x04, 0x3277 },
  67                 { 0x40, 0x80, 0x2250 },
  68                 { 0x40, 0xc0, 0x5080 },
  69                 { 0x80, 0x00, 0x3215 },
  70         };
  71         int i;
  72
  73         /* Special case for osa devices. */
  74         if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
  75                 senseid->cu_type = 0x3088;
  76                 senseid->cu_model = 0x60;
  77                 senseid->reserved = 0xff;
  78                 return 0;
  79         }
  80         for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
  81                 if (diag->vrdcvcla == vm_devices[i].class &&
  82                     diag->vrdcvtyp == vm_devices[i].type) {
  83                         senseid->cu_type = vm_devices[i].cu_type;
  84                         senseid->reserved = 0xff;
  85                         return 0;
  86                 }
  87         }
  88
  89         return -ENODEV;
  90 }
  91
  92 /**
  93  * diag_get_dev_info - retrieve device information via diag 0x210
  94  * @cdev: ccw device
  95  *
  96  * Returns zero on success, non-zero otherwise.
  97  */
  98 static int diag210_get_dev_info(struct ccw_device *cdev)
  99 {
 100         struct ccw_dev_id *dev_id = &cdev->private->dev_id;
 101         struct senseid *senseid = &cdev->private->senseid;
 102         struct diag210 diag_data;
 103         int rc;
 104
 105         if (dev_id->ssid != 0)
 106                 return -ENODEV;
 107         memset(&diag_data, 0, sizeof(diag_data));
 108         diag_data.vrdcdvno      = dev_id->devno;
 109         diag_data.vrdclen       = sizeof(diag_data);
 110         rc = diag210(&diag_data);
 111         CIO_TRACE_EVENT(4, "diag210");
 112         CIO_HEX_EVENT(4, &rc, sizeof(rc));
 113         CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
 114         if (rc != 0 && rc != 2)
 115                 goto err_failed;
 116         if (diag210_to_senseid(senseid, &diag_data))
 117                 goto err_unknown;
 118         return 0;
 119
 120 err_unknown:
 121         CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
 122                       dev_id->ssid, dev_id->devno);
 123         return -ENODEV;
 124 err_failed:
 125         CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
 126                       dev_id->ssid, dev_id->devno, rc);
 127         return -ENODEV;
 128 }
 129
 130 /*
 131  * Initialize SENSE ID data.
 132  */
 133 static void snsid_init(struct ccw_device *cdev)
 134 {
 135         cdev->private->flags.esid = 0;
 136         memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
 137         cdev->private->senseid.cu_type = 0xffff;
 138 }
 139
 140 /*
 141  * Check for complete SENSE ID data.
 142  */
 143 static int snsid_check(struct ccw_device *cdev, void *data)
 144 {
 145         struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
 146         int len = sizeof(struct senseid) - scsw->count;
 147
 148         /* Check for incomplete SENSE ID data. */
 149         if (len < SENSE_ID_MIN_LEN)
 150                 goto out_restart;
 151         if (cdev->private->senseid.cu_type == 0xffff)
 152                 goto out_restart;
 153         /* Check for incompatible SENSE ID data. */
 154         if (cdev->private->senseid.reserved != 0xff)
 155                 return -EOPNOTSUPP;
 156         /* Check for extended-identification information. */
 157         if (len > SENSE_ID_BASIC_LEN)
 158                 cdev->private->flags.esid = 1;
 159         return 0;
 160
 161 out_restart:
 162         snsid_init(cdev);
 163         return -EAGAIN;
 164 }
 165
 166 /*
 167  * Process SENSE ID request result.
 168  */
 169 static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
 170 {
 171         struct ccw_dev_id *id = &cdev->private->dev_id;
 172         struct senseid *senseid = &cdev->private->senseid;
 173         int vm = 0;
 174
 175         if (rc && MACHINE_IS_VM) {
 176                 /* Try diag 0x210 fallback on z/VM. */
 177                 snsid_init(cdev);
 178                 if (diag210_get_dev_info(cdev) == 0) {
 179                         rc = 0;
 180                         vm = 1;
 181                 }
 182         }
 183         CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
 184                       "%04x/%02x%s\n", id->ssid, id->devno, rc,
 185                       senseid->cu_type, senseid->cu_model, senseid->dev_type,
 186                       senseid->dev_model, vm ? " (diag210)" : "");
 187         ccw_device_sense_id_done(cdev, rc);
 188 }
 189
 190 /**
 191  * ccw_device_sense_id_start - perform SENSE ID
 192  * @cdev: ccw device
 193  *
 194  * Execute a SENSE ID channel program on @cdev to update its sense id
 195  * information. When finished, call ccw_device_sense_id_done with a
 196  * return code specifying the result.
 197  */
 198 void ccw_device_sense_id_start(struct ccw_device *cdev)
 199 {
 200         struct subchannel *sch = to_subchannel(cdev->dev.parent);
 201         struct ccw_request *req = &cdev->private->req;
 202         struct ccw1 *cp = cdev->private->iccws;
 203
 204         CIO_TRACE_EVENT(4, "snsid");
 205         CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
 206         /* Data setup. */
 207         snsid_init(cdev);
 208         /* Channel program setup. */
 209         cp->cmd_code    = CCW_CMD_SENSE_ID;
 210         cp->cda         = (u32) (addr_t) &cdev->private->senseid;
 211         cp->count       = sizeof(struct senseid);
 212         cp->flags       = CCW_FLAG_SLI;
 213         /* Request setup. */
 214         memset(req, 0, sizeof(*req));
 215         req->cp         = cp;
 216         req->timeout    = SENSE_ID_TIMEOUT;
 217         req->maxretries = SENSE_ID_RETRIES;
 218         req->lpm        = sch->schib.pmcw.pam & sch->opm;
 219         req->check      = snsid_check;
 220         req->callback   = snsid_callback;
 221         ccw_request_start(cdev);
 222 }