+static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
+ struct dasd_device *device)
+{
+ struct dasd_eckd_private *private;
+ int rc;
+
+ private = (struct dasd_eckd_private *) device->private;
+ if (!private->rdc_data.facilities.XRC_supported)
+ return 0;
+
+ /* switch on System Time Stamp - needed for XRC Support */
+ pfxdata->define_extend.ga_extended |= 0x08; /* 'Time Stamp Valid' */
+ pfxdata->define_extend.ga_extended |= 0x02; /* 'Extended Parameter' */
+ pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
+
+ rc = get_sync_clock(&pfxdata->define_extend.ep_sys_time);
+ /* Ignore return code if sync clock is switched off. */
+ if (rc == -ENOSYS || rc == -EACCES)
+ rc = 0;
+ return rc;
+}
+
+static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, int trk,
+ int totrk, int cmd, struct dasd_device *basedev,
+ struct dasd_device *startdev)
+{
+ struct dasd_eckd_private *basepriv, *startpriv;
+ struct DE_eckd_data *data;
+ struct ch_t geo, beg, end;
+ int rc = 0;
+
+ basepriv = (struct dasd_eckd_private *) basedev->private;
+ startpriv = (struct dasd_eckd_private *) startdev->private;
+ data = &pfxdata->define_extend;
+
+ ccw->cmd_code = DASD_ECKD_CCW_PFX;
+ ccw->flags = 0;
+ ccw->count = sizeof(*pfxdata);
+ ccw->cda = (__u32) __pa(pfxdata);
+
+ memset(pfxdata, 0, sizeof(*pfxdata));
+ /* prefix data */
+ pfxdata->format = 0;
+ pfxdata->base_address = basepriv->conf_data.ned1.unit_addr;
+ pfxdata->base_lss = basepriv->conf_data.ned1.ID;
+ pfxdata->validity.define_extend = 1;
+
+ /* private uid is kept up to date, conf_data may be outdated */
+ if (startpriv->uid.type != UA_BASE_DEVICE) {
+ pfxdata->validity.verify_base = 1;
+ if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
+ pfxdata->validity.hyper_pav = 1;
+ }
+
+ /* define extend data (mostly)*/
+ switch (cmd) {
+ case DASD_ECKD_CCW_READ_HOME_ADDRESS:
+ case DASD_ECKD_CCW_READ_RECORD_ZERO:
+ case DASD_ECKD_CCW_READ:
+ case DASD_ECKD_CCW_READ_MT:
+ case DASD_ECKD_CCW_READ_CKD:
+ case DASD_ECKD_CCW_READ_CKD_MT:
+ case DASD_ECKD_CCW_READ_KD:
+ case DASD_ECKD_CCW_READ_KD_MT:
+ case DASD_ECKD_CCW_READ_COUNT:
+ data->mask.perm = 0x1;
+ data->attributes.operation = basepriv->attrib.operation;
+ break;
+ case DASD_ECKD_CCW_WRITE:
+ case DASD_ECKD_CCW_WRITE_MT:
+ case DASD_ECKD_CCW_WRITE_KD:
+ case DASD_ECKD_CCW_WRITE_KD_MT:
+ data->mask.perm = 0x02;
+ data->attributes.operation = basepriv->attrib.operation;
+ rc = check_XRC_on_prefix(pfxdata, basedev);
+ break;
+ case DASD_ECKD_CCW_WRITE_CKD:
+ case DASD_ECKD_CCW_WRITE_CKD_MT:
+ data->attributes.operation = DASD_BYPASS_CACHE;
+ rc = check_XRC_on_prefix(pfxdata, basedev);
+ break;
+ case DASD_ECKD_CCW_ERASE:
+ case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
+ case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
+ data->mask.perm = 0x3;
+ data->mask.auth = 0x1;
+ data->attributes.operation = DASD_BYPASS_CACHE;
+ rc = check_XRC_on_prefix(pfxdata, basedev);
+ break;
+ default:
+ DEV_MESSAGE(KERN_ERR, basedev, "unknown opcode 0x%x", cmd);
+ break;
+ }
+
+ data->attributes.mode = 0x3; /* ECKD */
+
+ if ((basepriv->rdc_data.cu_type == 0x2105 ||
+ basepriv->rdc_data.cu_type == 0x2107 ||
+ basepriv->rdc_data.cu_type == 0x1750)
+ && !(basepriv->uses_cdl && trk < 2))
+ data->ga_extended |= 0x40; /* Regular Data Format Mode */
+
+ geo.cyl = basepriv->rdc_data.no_cyl;
+ geo.head = basepriv->rdc_data.trk_per_cyl;
+ beg.cyl = trk / geo.head;
+ beg.head = trk % geo.head;
+ end.cyl = totrk / geo.head;
+ end.head = totrk % geo.head;
+
+ /* check for sequential prestage - enhance cylinder range */
+ if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
+ data->attributes.operation == DASD_SEQ_ACCESS) {
+
+ if (end.cyl + basepriv->attrib.nr_cyl < geo.cyl)
+ end.cyl += basepriv->attrib.nr_cyl;
+ else
+ end.cyl = (geo.cyl - 1);
+ }
+
+ data->beg_ext.cyl = beg.cyl;
+ data->beg_ext.head = beg.head;
+ data->end_ext.cyl = end.cyl;
+ data->end_ext.head = end.head;
+ return rc;
+}
+