/* * drivers/s390/char/tape_34xx.c * tape device discipline for 3480/3490 tapes. * * Copyright IBM Corp. 2001, 2009 * Author(s): Carsten Otte <cotte@de.ibm.com> * Tuan Ngo-Anh <ngoanh@de.ibm.com> * Martin Schwidefsky <schwidefsky@de.ibm.com> */ #define KMSG_COMPONENT "tape_34xx" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/module.h> #include <linux/init.h> #include <linux/bio.h> #include <linux/workqueue.h> #include <linux/slab.h> #define TAPE_DBF_AREA tape_34xx_dbf #include "tape.h" #include "tape_std.h" /* * Pointer to debug area. */ debug_info_t *TAPE_DBF_AREA = NULL; EXPORT_SYMBOL(TAPE_DBF_AREA); #define TAPE34XX_FMT_3480 0 #define TAPE34XX_FMT_3480_2_XF 1 #define TAPE34XX_FMT_3480_XF 2 struct tape_34xx_block_id { unsigned int wrap : 1; unsigned int segment : 7; unsigned int format : 2; unsigned int block : 22; }; /* * A list of block ID's is used to faster seek blocks. */ struct tape_34xx_sbid { struct list_head list; struct tape_34xx_block_id bid; }; static void tape_34xx_delete_sbid_from(struct tape_device *, int); /* * Medium sense for 34xx tapes. There is no 'real' medium sense call. * So we just do a normal sense. */ static void __tape_34xx_medium_sense(struct tape_request *request) { struct tape_device *device = request->device; unsigned char *sense; if (request->rc == 0) { sense = request->cpdata; /* * This isn't quite correct. But since INTERVENTION_REQUIRED * means that the drive is 'neither ready nor on-line' it is * only slightly inaccurate to say there is no tape loaded if * the drive isn't online... */ if (sense[0] & SENSE_INTERVENTION_REQUIRED) tape_med_state_set(device, MS_UNLOADED); else tape_med_state_set(device, MS_LOADED); if (sense[1] & SENSE_WRITE_PROTECT) device->tape_generic_status |= GMT_WR_PROT(~0); else device->tape_generic_status &= ~GMT_WR_PROT(~0); } else DBF_EVENT(4, "tape_34xx: medium sense failed with rc=%d\n", request->rc); tape_free_request(request); } static int tape_34xx_medium_sense(struct tape_device *device) { struct tape_request *request; int rc; request = tape_alloc_request(1, 32); if (IS_ERR(request)) { DBF_EXCEPTION(6, "MSEN fail\n"); return PTR_ERR(request); } request->op = TO_MSEN; tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); rc = tape_do_io_interruptible(device, request); __tape_34xx_medium_sense(request); return rc; } static void tape_34xx_medium_sense_async(struct tape_device *device) { struct tape_request *request; request = tape_alloc_request(1, 32); if (IS_ERR(request)) { DBF_EXCEPTION(6, "MSEN fail\n"); return; } request->op = TO_MSEN; tape_ccw_end(request->cpaddr, SENSE, 32, request->cpdata); request->callback = (void *) __tape_34xx_medium_sense; request->callback_data = NULL; tape_do_io_async(device, request); } struct tape_34xx_work { struct tape_device *device; enum tape_op op; struct work_struct work; }; /* * These functions are currently used only to schedule a medium_sense for * later execution. This is because we get an interrupt whenever a medium * is inserted but cannot call tape_do_io* from an interrupt context. * Maybe that's useful for other actions we want to start from the * interrupt handler. * Note: the work handler is called by the system work queue. The tape * commands started by the handler need to be asynchrounous, otherwise * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq). */ static void tape_34xx_work_handler(struct work_struct *work) { struct tape_34xx_work *p = container_of(work, struct tape_34xx_work, work); struct tape_device *device = p->device; switch(p->op) { case TO_MSEN: tape_34xx_medium_sense_async(device); break; default: DBF_EVENT(3, "T34XX: internal error: unknown work\n"); } tape_put_device(device); kfree(p); } static int tape_34xx_schedule_work(struct tape_device *device, enum tape_op op) { struct tape_34xx_work *p; if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL) return -ENOMEM; INIT_WORK(&p->work, tape_34xx_work_handler); p->device = tape_get_device(device); p->op = op; schedule_work(&p->work); return 0; } /* * Done Handler is called when dev stat = DEVICE-END (successful operation) */ static inline int tape_34xx_done(struct tape_request *request) { DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]); switch (request->op) { case TO_DSE: case TO_RUN: case TO_WRI: case TO_WTM: case TO_ASSIGN: case TO_UNASSIGN: tape_34xx_delete_sbid_from(request->device, 0); break; default: ; } return TAPE_IO_SUCCESS; } static inline int tape_34xx_erp_failed(struct tape_request *request, int rc) { DBF_EVENT(3, "Error recovery failed for %s (RC=%d)\n", tape_op_verbose[request->op], rc); return rc; } static inline int tape_34xx_erp_succeeded(struct tape_request *request) { DBF_EVENT(3, "Error Recovery successful for %s\n", tape_op_verbose[request->op]); return tape_34xx_done(request); } static inline int tape_34xx_erp_retry(struct tape_request *request) { DBF_EVENT(3, "xerp retr %s\n", tape_op_verbose[request->op]); return TAPE_IO_RETRY; } /* * This function is called, when no request is outstanding and we get an * interrupt */ static int tape_34xx_unsolicited_irq(struct tape_device *device, struct irb *irb) { if (irb->scsw.cmd.dstat == 0x85) { /* READY */ /* A medium was inserted in the drive. */ DBF_EVENT(6, "xuud med\n"); tape_34xx_delete_sbid_from(device, 0); tape_34xx_schedule_work(device, TO_MSEN); } else { DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id); tape_dump_sense_dbf(device, NULL, irb); } return TAPE_IO_SUCCESS; } /* * Read Opposite Error Recovery Function: * Used, when Read Forward does not work */ static int tape_34xx_erp_read_opposite(struct tape_device *device, struct tape_request *request) { if (request->op == TO_RFO) { /* * We did read forward, but the data could not be read * *correctly*. We transform the request to a read backward * and try again. */ tape_std_read_backward(device, request); return tape_34xx_erp_retry(request); } /* * We tried to read forward and backward, but hat no * success -> failed. */ return tape_34xx_erp_failed(request, -EIO); } static int tape_34xx_erp_bug(struct tape_device *device, struct tape_request *request, struct irb *irb, int no) { if (request->op != TO_ASSIGN) { dev_err(&device->cdev->dev, "An unexpected condition %d " "occurred in tape error recovery\n", no); tape_dump_sense_dbf(device, request, irb); } return tape_34xx_erp_failed(request, -EIO); } /* * Handle data overrun between cu and drive. The channel speed might * be too slow. */ static int tape_34xx_erp_overrun(struct tape_device *device, struct tape_request *request, struct irb *irb) { if (irb->ecw[3] == 0x40) { dev_warn (&device->cdev->dev, "A data overrun occurred between" " the control unit and tape unit\n"); return tape_34xx_erp_failed(request, -EIO); } return tape_34xx_erp_bug(device, request, irb, -1); } /* * Handle record sequence error. */ static int tape_34xx_erp_sequence(struct tape_device *device, struct tape_request *request, struct irb *irb) { if (irb->ecw[3] == 0x41) { /* * cu detected incorrect block-id sequence on tape. */ dev_warn (&device->cdev->dev, "The block ID sequence on the " "tape is incorrect\n"); return tape_34xx_erp_failed(request, -EIO); } /* * Record sequence error bit is set, but erpa does not * show record sequence error. */ return tape_34xx_erp_bug(device, request, irb, -2); } /* * This function analyses the tape's sense-data in case of a unit-check. * If possible, it tries to recover from the error. Else the user is * informed about the problem. */ static int tape_34xx_unit_check(struct tape_device *device, struct tape_request *request, struct irb *irb) { int inhibit_cu_recovery; __u8* sense; inhibit_cu_recovery = (*device->modeset_byte & 0x80) ? 1 : 0; sense = irb->ecw; #ifdef CONFIG_S390_TAPE_BLOCK if (request->op == TO_BLOCK) { /* * Recovery for block device requests. Set the block_position * to something invalid and retry. */ device->blk_data.block_position = -1; if (request->retries-- <= 0) return tape_34xx_erp_failed(request, -EIO); else return tape_34xx_erp_retry(request); } #endif if ( sense[0] & SENSE_COMMAND_REJECT && sense[1] & SENSE_WRITE_PROTECT ) { if ( request->op == TO_DSE || request->op == TO_WRI || request->op == TO_WTM ) { /* medium is write protected */ return tape_34xx_erp_failed(request, -EACCES); } else { return tape_34xx_erp_bug(device, request, irb, -3); } } /* * Special cases for various tape-states when reaching * end of recorded area * * FIXME: Maybe a special case of the special case: * sense[0] == SENSE_EQUIPMENT_CHECK && * sense[1] == SENSE_DRIVE_ONLINE && * sense[3] == 0x47 (Volume Fenced) * * This was caused by continued FSF or FSR after an * 'End Of Data'. */ if (( sense[0] == SENSE_DATA_CHECK || sense[0] == SENSE_EQUIPMENT_CHECK || sense[0] == SENSE_EQUIPMENT_CHECK + SENSE_DEFERRED_UNIT_CHECK ) && ( sense[1] == SENSE_DRIVE_ONLINE || sense[1] == SENSE_BEGINNING_OF_TAPE + SENSE_WRITE_MODE )) { switch (request->op) { /* * sense[0] == SENSE_DATA_CHECK && * sense[1] == SENSE_DRIVE_ONLINE * sense[3] == 0x36 (End Of Data) * * Further seeks might return a 'Volume Fenced'. */ case TO_FSF: case TO_FSB: /* Trying to seek beyond end of recorded area */ return tape_34xx_erp_failed(request, -ENOSPC); case TO_BSB: return tape_34xx_erp_retry(request); /* * sense[0] == SENSE_DATA_CHECK && * sense[1] == SENSE_DRIVE_ONLINE && * sense[3] == 0x36 (End Of Data) */ case TO_LBL: /* Block could not be located. */ tape_34xx_delete_sbid_from(device, 0); return tape_34xx_erp_failed(request, -EIO); case TO_RFO: /* Read beyond end of recorded area -> 0 bytes read */ return tape_34xx_erp_failed(request, 0); /* * sense[0] == SENSE_EQUIPMENT_CHECK && * sense[1] == SENSE_DRIVE_ONLINE && * sense[3] == 0x38 (Physical End Of Volume) */ case TO_WRI: /* Writing at physical end of volume */ return tape_34xx_erp_failed(request, -ENOSPC); default: return tape_34xx_erp_failed(request, 0); } } /* Sensing special bits */ if (sense[0] & SENSE_BUS_OUT_CHECK) return tape_34xx_erp_retry(request); if (sense[0] & SENSE_DATA_CHECK) { /* * hardware failure, damaged tape or improper * operating conditions */ switch (sense[3]) { case 0x23: /* a read data check occurred */ if ((sense[2] & SENSE_TAPE_SYNC_MODE) || inhibit_cu_recovery) // data check is not permanent, may be // recovered. We always use async-mode with // cu-recovery, so this should *never* happen. return tape_34xx_erp_bug(device, request, irb, -4); /* data check is permanent, CU recovery has failed */ dev_warn (&device->cdev->dev, "A read error occurred " "that cannot be recovered\n"); return tape_34xx_erp_failed(request, -EIO); case 0x25: // a write data check occurred if ((sense[2] & SENSE_TAPE_SYNC_MODE) || inhibit_cu_recovery) // data check is not permanent, may be // recovered. We always use async-mode with // cu-recovery, so this should *never* happen. return tape_34xx_erp_bug(device, request, irb, -5); // data check is permanent, cu-recovery has failed dev_warn (&device->cdev->dev, "A write error on the " "tape cannot be recovered\n"); return tape_34xx_erp_failed(request, -EIO); case 0x26: /* Data Check (read opposite) occurred. */ return tape_34xx_erp_read_opposite(device, request); case 0x28: /* ID-Mark at tape start couldn't be written */ dev_warn (&device->cdev->dev, "Writing the ID-mark " "failed\n"); return tape_34xx_erp_failed(request, -EIO); case 0x31: /* Tape void. Tried to read beyond end of device. */ dev_warn (&device->cdev->dev, "Reading the tape beyond" " the end of the recorded area failed\n"); return tape_34xx_erp_failed(request, -ENOSPC); case 0x41: /* Record sequence error. */ dev_warn (&device->cdev->dev, "The tape contains an " "incorrect block ID sequence\n"); return tape_34xx_erp_failed(request, -EIO); default: /* all data checks for 3480 should result in one of * the above erpa-codes. For 3490, other data-check * conditions do exist. */ if (device->cdev->id.driver_info == tape_3480) return tape_34xx_erp_bug(device, request, irb, -6); } } if (sense[0] & SENSE_OVERRUN) return tape_34xx_erp_overrun(device, request, irb); if (sense[1] & SENSE_RECORD_SEQUENCE_ERR) return tape_34xx_erp_sequence(device, request, irb); /* Sensing erpa codes */ switch (sense[3]) { case 0x00: /* Unit check with erpa code 0. Report and ignore. */ return TAPE_IO_SUCCESS; case 0x21: /* * Data streaming not operational. CU will switch to * interlock mode. Reissue the command. */ return tape_34xx_erp_retry(request); case 0x22: /* * Path equipment check. Might be drive adapter error, buffer * error on the lower interface, internal path not usable, * or error during cartridge load. */ dev_warn (&device->cdev->dev, "A path equipment check occurred" " for the tape device\n"); return tape_34xx_erp_failed(request, -EIO); case 0x24: /* * Load display check. Load display was command was issued, * but the drive is displaying a drive check message. Can * be threated as "device end". */ return tape_34xx_erp_succeeded(request); case 0x27: /* * Command reject. May indicate illegal channel program or * buffer over/underrun. Since all channel programs are * issued by this driver and ought be correct, we assume a * over/underrun situation and retry the channel program. */ return tape_34xx_erp_retry(request); case 0x29: /* * Function incompatible. Either the tape is idrc compressed * but the hardware isn't capable to do idrc, or a perform * subsystem func is issued and the CU is not on-line. */ return tape_34xx_erp_failed(request, -EIO); case 0x2a: /* * Unsolicited environmental data. An internal counter * overflows, we can ignore this and reissue the cmd. */ return tape_34xx_erp_retry(request); case 0x2b: /* * Environmental data present. Indicates either unload * completed ok or read buffered log command completed ok. */ if (request->op == TO_RUN) { /* Rewind unload completed ok. */ tape_med_state_set(device, MS_UNLOADED); return tape_34xx_erp_succeeded(request); } /* tape_34xx doesn't use read buffered log commands. */ return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x2c: /* * Permanent equipment check. CU has tried recovery, but * did not succeed. */ return tape_34xx_erp_failed(request, -EIO); case 0x2d: /* Data security erase failure. */ if (request->op == TO_DSE) return tape_34xx_erp_failed(request, -EIO); /* Data security erase failure, but no such command issued. */ return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x2e: /* * Not capable. This indicates either that the drive fails * reading the format id mark or that that format specified * is not supported by the drive. */ dev_warn (&device->cdev->dev, "The tape unit cannot process " "the tape format\n"); return tape_34xx_erp_failed(request, -EMEDIUMTYPE); case 0x30: /* The medium is write protected. */ dev_warn (&device->cdev->dev, "The tape medium is write-" "protected\n"); return tape_34xx_erp_failed(request, -EACCES); case 0x32: // Tension loss. We cannot recover this, it's an I/O error. dev_warn (&device->cdev->dev, "The tape does not have the " "required tape tension\n"); return tape_34xx_erp_failed(request, -EIO); case 0x33: /* * Load Failure. The cartridge was not inserted correctly or * the tape is not threaded correctly. */ dev_warn (&device->cdev->dev, "The tape unit failed to load" " the cartridge\n"); tape_34xx_delete_sbid_from(device, 0); return tape_34xx_erp_failed(request, -EIO); case 0x34: /* * Unload failure. The drive cannot maintain tape tension * and control tape movement during an unload operation. */ dev_warn (&device->cdev->dev, "Automatic unloading of the tape" " cartridge failed\n"); if (request->op == TO_RUN) return tape_34xx_erp_failed(request, -EIO); return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x35: /* * Drive equipment check. One of the following: * - cu cannot recover from a drive detected error * - a check code message is shown on drive display * - the cartridge loader does not respond correctly * - a failure occurs during an index, load, or unload cycle */ dev_warn (&device->cdev->dev, "An equipment check has occurred" " on the tape unit\n"); return tape_34xx_erp_failed(request, -EIO); case 0x36: if (device->cdev->id.driver_info == tape_3490) /* End of data. */ return tape_34xx_erp_failed(request, -EIO); /* This erpa is reserved for 3480 */ return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x37: /* * Tape length error. The tape is shorter than reported in * the beginning-of-tape data. */ dev_warn (&device->cdev->dev, "The tape information states an" " incorrect length\n"); return tape_34xx_erp_failed(request, -EIO); case 0x38: /* * Physical end of tape. A read/write operation reached * the physical end of tape. */ if (request->op==TO_WRI || request->op==TO_DSE || request->op==TO_WTM) return tape_34xx_erp_failed(request, -ENOSPC); return tape_34xx_erp_failed(request, -EIO); case 0x39: /* Backward at Beginning of tape. */ return tape_34xx_erp_failed(request, -EIO); case 0x3a: /* Drive switched to not ready. */ dev_warn (&device->cdev->dev, "The tape unit is not ready\n"); return tape_34xx_erp_failed(request, -EIO); case 0x3b: /* Manual rewind or unload. This causes an I/O error. */ dev_warn (&device->cdev->dev, "The tape medium has been " "rewound or unloaded manually\n"); tape_34xx_delete_sbid_from(device, 0); return tape_34xx_erp_failed(request, -EIO); case 0x42: /* * Degraded mode. A condition that can cause degraded * performance is detected. */ dev_warn (&device->cdev->dev, "The tape subsystem is running " "in degraded mode\n"); return tape_34xx_erp_retry(request); case 0x43: /* Drive not ready. */ tape_34xx_delete_sbid_from(device, 0); tape_med_state_set(device, MS_UNLOADED); /* Some commands commands are successful even in this case */ if (sense[1] & SENSE_DRIVE_ONLINE) { switch(request->op) { case TO_ASSIGN: case TO_UNASSIGN: case TO_DIS: case TO_NOP: return tape_34xx_done(request); break; default: break; } } return tape_34xx_erp_failed(request, -ENOMEDIUM); case 0x44: /* Locate Block unsuccessful. */ if (request->op != TO_BLOCK && request->op != TO_LBL) /* No locate block was issued. */ return tape_34xx_erp_bug(device, request, irb, sense[3]); return tape_34xx_erp_failed(request, -EIO); case 0x45: /* The drive is assigned to a different channel path. */ dev_warn (&device->cdev->dev, "The tape unit is already " "assigned\n"); return tape_34xx_erp_failed(request, -EIO); case 0x46: /* * Drive not on-line. Drive may be switched offline, * the power supply may be switched off or * the drive address may not be set correctly. */ dev_warn (&device->cdev->dev, "The tape unit is not online\n"); return tape_34xx_erp_failed(request, -EIO); case 0x47: /* Volume fenced. CU reports volume integrity is lost. */ dev_warn (&device->cdev->dev, "The control unit has fenced " "access to the tape volume\n"); tape_34xx_delete_sbid_from(device, 0); return tape_34xx_erp_failed(request, -EIO); case 0x48: /* Log sense data and retry request. */ return tape_34xx_erp_retry(request); case 0x49: /* Bus out check. A parity check error on the bus was found. */ dev_warn (&device->cdev->dev, "A parity error occurred on the " "tape bus\n"); return tape_34xx_erp_failed(request, -EIO); case 0x4a: /* Control unit erp failed. */ dev_warn (&device->cdev->dev, "I/O error recovery failed on " "the tape control unit\n"); return tape_34xx_erp_failed(request, -EIO); case 0x4b: /* * CU and drive incompatible. The drive requests micro-program * patches, which are not available on the CU. */ dev_warn (&device->cdev->dev, "The tape unit requires a " "firmware update\n"); return tape_34xx_erp_failed(request, -EIO); case 0x4c: /* * Recovered Check-One failure. Cu develops a hardware error, * but is able to recover. */ return tape_34xx_erp_retry(request); case 0x4d: if (device->cdev->id.driver_info == tape_3490) /* * Resetting event received. Since the driver does * not support resetting event recovery (which has to * be handled by the I/O Layer), retry our command. */ return tape_34xx_erp_retry(request); /* This erpa is reserved for 3480. */ return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x4e: if (device->cdev->id.driver_info == tape_3490) { /* * Maximum block size exceeded. This indicates, that * the block to be written is larger than allowed for * buffered mode. */ dev_warn (&device->cdev->dev, "The maximum block size" " for buffered mode is exceeded\n"); return tape_34xx_erp_failed(request, -ENOBUFS); } /* This erpa is reserved for 3480. */ return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x50: /* * Read buffered log (Overflow). CU is running in extended * buffered log mode, and a counter overflows. This should * never happen, since we're never running in extended * buffered log mode. */ return tape_34xx_erp_retry(request); case 0x51: /* * Read buffered log (EOV). EOF processing occurs while the * CU is in extended buffered log mode. This should never * happen, since we're never running in extended buffered * log mode. */ return tape_34xx_erp_retry(request); case 0x52: /* End of Volume complete. Rewind unload completed ok. */ if (request->op == TO_RUN) { tape_med_state_set(device, MS_UNLOADED); tape_34xx_delete_sbid_from(device, 0); return tape_34xx_erp_succeeded(request); } return tape_34xx_erp_bug(device, request, irb, sense[3]); case 0x53: /* Global command intercept. */ return tape_34xx_erp_retry(request); case 0x54: /* Channel interface recovery (temporary). */ return tape_34xx_erp_retry(request); case 0x55: /* Channel interface recovery (permanent). */ dev_warn (&device->cdev->dev, "A channel interface error cannot be" " recovered\n"); return tape_34xx_erp_failed(request, -EIO); case 0x56: /* Channel protocol error. */ dev_warn (&device->cdev->dev, "A channel protocol error " "occurred\n"); return tape_34xx_erp_failed(request, -EIO); case 0x57: if (device->cdev->id.driver_info == tape_3480) { /* Attention intercept. */ return tape_34xx_erp_retry(request); } else { /* Global status intercept. */ return tape_34xx_erp_retry(request); } case 0x5a: /* * Tape length incompatible. The tape inserted is too long, * which could cause damage to the tape or the drive. */ dev_warn (&device->cdev->dev, "The tape unit does not support " "the tape length\n"); return tape_34xx_erp_failed(request, -EIO); case 0x5b: /* Format 3480 XF incompatible */ if (sense[1] & SENSE_BEGINNING_OF_TAPE) /* The tape will get overwritten. */ return tape_34xx_erp_retry(request); dev_warn (&device->cdev->dev, "The tape unit does not support" " format 3480 XF\n"); return tape_34xx_erp_failed(request, -EIO); case 0x5c: /* Format 3480-2 XF incompatible */ dev_warn (&device->cdev->dev, "The tape unit does not support tape " "format 3480-2 XF\n"); return tape_34xx_erp_failed(request, -EIO); case 0x5d: /* Tape length violation. */ dev_warn (&device->cdev->dev, "The tape unit does not support" " the current tape length\n"); return tape_34xx_erp_failed(request, -EMEDIUMTYPE); case 0x5e: /* Compaction algorithm incompatible. */ dev_warn (&device->cdev->dev, "The tape unit does not support" " the compaction algorithm\n"); return tape_34xx_erp_failed(request, -EMEDIUMTYPE); /* The following erpas should have been covered earlier. */ case 0x23: /* Read data check. */ case 0x25: /* Write data check. */ case 0x26: /* Data check (read opposite). */ case 0x28: /* Write id mark check. */ case 0x31: /* Tape void. */ case 0x40: /* Overrun error. */ case 0x41: /* Record sequence error. */ /* All other erpas are reserved for future use. */ default: return tape_34xx_erp_bug(device, request, irb, sense[3]); } } /* * 3480/3490 interrupt handler */ static int tape_34xx_irq(struct tape_device *device, struct tape_request *request, struct irb *irb) { if (request == NULL) return tape_34xx_unsolicited_irq(device, irb); if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) && (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) && (request->op == TO_WRI)) { /* Write at end of volume */ return tape_34xx_erp_failed(request, -ENOSPC); } if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) return tape_34xx_unit_check(device, request, irb); if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) { /* * A unit exception occurs on skipping over a tapemark block. */ if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) { if (request->op == TO_BSB || request->op == TO_FSB) request->rescnt++; else DBF_EVENT(5, "Unit Exception!\n"); } return tape_34xx_done(request); } DBF_EVENT(6, "xunknownirq\n"); tape_dump_sense_dbf(device, request, irb); return TAPE_IO_STOP; } /* * ioctl_overload */ static int tape_34xx_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg) { if (cmd == TAPE390_DISPLAY) { struct display_struct disp; if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)) != 0) return -EFAULT; return tape_std_display(device, &disp); } else return -EINVAL; } static inline void tape_34xx_append_new_sbid(struct tape_34xx_block_id bid, struct list_head *l) { struct tape_34xx_sbid * new_sbid; new_sbid = kmalloc(sizeof(*new_sbid), GFP_ATOMIC); if (!new_sbid) return; new_sbid->bid = bid; list_add(&new_sbid->list, l); } /* * Build up the search block ID list. The block ID consists of a logical * block number and a hardware specific part. The hardware specific part * helps the tape drive to speed up searching for a specific block. */ static void tape_34xx_add_sbid(struct tape_device *device, struct tape_34xx_block_id bid) { struct list_head * sbid_list; struct tape_34xx_sbid * sbid; struct list_head * l; /* * immediately return if there is no list at all or the block to add * is located in segment 1 of wrap 0 because this position is used * if no hardware position data is supplied. */ sbid_list = (struct list_head *) device->discdata; if (!sbid_list || (bid.segment < 2 && bid.wrap == 0)) return; /* * Search the position where to insert the new entry. Hardware * acceleration uses only the segment and wrap number. So we * need only one entry for a specific wrap/segment combination. * If there is a block with a lower number but the same hard- * ware position data we just update the block number in the * existing entry. */ list_for_each(l, sbid_list) { sbid = list_entry(l, struct tape_34xx_sbid, list); if ( (sbid->bid.segment == bid.segment) && (sbid->bid.wrap == bid.wrap) ) { if (bid.block < sbid->bid.block) sbid->bid = bid; else return; break; } /* Sort in according to logical block number. */ if (bid.block < sbid->bid.block) { tape_34xx_append_new_sbid(bid, l->prev); break; } } /* List empty or new block bigger than last entry. */ if (l == sbid_list) tape_34xx_append_new_sbid(bid, l->prev); DBF_LH(4, "Current list is:\n"); list_for_each(l, sbid_list) { sbid = list_entry(l, struct tape_34xx_sbid, list); DBF_LH(4, "%d:%03d@%05d\n", sbid->bid.wrap, sbid->bid.segment, sbid->bid.block ); } } /* * Delete all entries from the search block ID list that belong to tape blocks * equal or higher than the given number. */ static void tape_34xx_delete_sbid_from(struct tape_device *device, int from) { struct list_head * sbid_list; struct tape_34xx_sbid * sbid; struct list_head * l; struct list_head * n; sbid_list = (struct list_head *) device->discdata; if (!sbid_list) return; list_for_each_safe(l, n, sbid_list) { sbid = list_entry(l, struct tape_34xx_sbid, list); if (sbid->bid.block >= from) { DBF_LH(4, "Delete sbid %d:%03d@%05d\n", sbid->bid.wrap, sbid->bid.segment, sbid->bid.block ); list_del(l); kfree(sbid); } } } /* * Merge hardware position data into a block id. */ static void tape_34xx_merge_sbid( struct tape_device * device, struct tape_34xx_block_id * bid ) { struct tape_34xx_sbid * sbid; struct tape_34xx_sbid * sbid_to_use; struct list_head * sbid_list; struct list_head * l; sbid_list = (struct list_head *) device->discdata; bid->wrap = 0; bid->segment = 1; if (!sbid_list || list_empty(sbid_list)) return; sbid_to_use = NULL; list_for_each(l, sbid_list) { sbid = list_entry(l, struct tape_34xx_sbid, list); if (sbid->bid.block >= bid->block) break; sbid_to_use = sbid; } if (sbid_to_use) { bid->wrap = sbid_to_use->bid.wrap; bid->segment = sbid_to_use->bid.segment; DBF_LH(4, "Use %d:%03d@%05d for %05d\n", sbid_to_use->bid.wrap, sbid_to_use->bid.segment, sbid_to_use->bid.block, bid->block ); } } static int tape_34xx_setup_device(struct tape_device * device) { int rc; struct list_head * discdata; DBF_EVENT(6, "34xx device setup\n"); if ((rc = tape_std_assign(device)) == 0) { if ((rc = tape_34xx_medium_sense(device)) != 0) { DBF_LH(3, "34xx medium sense returned %d\n", rc); } } discdata = kmalloc(sizeof(struct list_head), GFP_KERNEL); if (discdata) { INIT_LIST_HEAD(discdata); device->discdata = discdata; } return rc; } static void tape_34xx_cleanup_device(struct tape_device *device) { tape_std_unassign(device); if (device->discdata) { tape_34xx_delete_sbid_from(device, 0); kfree(device->discdata); device->discdata = NULL; } } /* * MTTELL: Tell block. Return the number of block relative to current file. */ static int tape_34xx_mttell(struct tape_device *device, int mt_count) { struct { struct tape_34xx_block_id cbid; struct tape_34xx_block_id dbid; } __attribute__ ((packed)) block_id; int rc; rc = tape_std_read_block_id(device, (__u64 *) &block_id); if (rc) return rc; tape_34xx_add_sbid(device, block_id.cbid); return block_id.cbid.block; } /* * MTSEEK: seek to the specified block. */ static int tape_34xx_mtseek(struct tape_device *device, int mt_count) { struct tape_request *request; struct tape_34xx_block_id * bid; if (mt_count > 0x3fffff) { DBF_EXCEPTION(6, "xsee parm\n"); return -EINVAL; } request = tape_alloc_request(3, 4); if (IS_ERR(request)) return PTR_ERR(request); /* setup ccws */ request->op = TO_LBL; bid = (struct tape_34xx_block_id *) request->cpdata; bid->format = (*device->modeset_byte & 0x08) ? TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; bid->block = mt_count; tape_34xx_merge_sbid(device, bid); tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte); tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL); /* execute it */ return tape_do_io_free(device, request); } #ifdef CONFIG_S390_TAPE_BLOCK /* * Tape block read for 34xx. */ static struct tape_request * tape_34xx_bread(struct tape_device *device, struct request *req) { struct tape_request *request; struct ccw1 *ccw; int count = 0; unsigned off; char *dst; struct bio_vec *bv; struct req_iterator iter; struct tape_34xx_block_id * start_block; DBF_EVENT(6, "xBREDid:"); /* Count the number of blocks for the request. */ rq_for_each_segment(bv, req, iter) count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9); /* Allocate the ccw request. */ request = tape_alloc_request(3+count+1, 8); if (IS_ERR(request)) return request; /* Setup ccws. */ request->op = TO_BLOCK; start_block = (struct tape_34xx_block_id *) request->cpdata; start_block->block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B; DBF_EVENT(6, "start_block = %i\n", start_block->block); ccw = request->cpaddr; ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte); /* * We always setup a nop after the mode set ccw. This slot is * used in tape_std_check_locate to insert a locate ccw if the * current tape position doesn't match the start block to be read. * The second nop will be filled with a read block id which is in * turn used by tape_34xx_free_bread to populate the segment bid * table. */ ccw = tape_ccw_cc(ccw, NOP, 0, NULL); ccw = tape_ccw_cc(ccw, NOP, 0, NULL); rq_for_each_segment(bv, req, iter) { dst = kmap(bv->bv_page) + bv->bv_offset; for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) { ccw->flags = CCW_FLAG_CC; ccw->cmd_code = READ_FORWARD; ccw->count = TAPEBLOCK_HSEC_SIZE; set_normalized_cda(ccw, (void*) __pa(dst)); ccw++; dst += TAPEBLOCK_HSEC_SIZE; } } ccw = tape_ccw_end(ccw, NOP, 0, NULL); DBF_EVENT(6, "xBREDccwg\n"); return request; } static void tape_34xx_free_bread (struct tape_request *request) { struct ccw1* ccw; ccw = request->cpaddr; if ((ccw + 2)->cmd_code == READ_BLOCK_ID) { struct { struct tape_34xx_block_id cbid; struct tape_34xx_block_id dbid; } __attribute__ ((packed)) *rbi_data; rbi_data = request->cpdata; if (request->device) tape_34xx_add_sbid(request->device, rbi_data->cbid); } /* Last ccw is a nop and doesn't need clear_normalized_cda */ for (; ccw->flags & CCW_FLAG_CC; ccw++) if (ccw->cmd_code == READ_FORWARD) clear_normalized_cda(ccw); tape_free_request(request); } /* * check_locate is called just before the tape request is passed to * the common io layer for execution. It has to check the current * tape position and insert a locate ccw if it doesn't match the * start block for the request. */ static void tape_34xx_check_locate(struct tape_device *device, struct tape_request *request) { struct tape_34xx_block_id * start_block; start_block = (struct tape_34xx_block_id *) request->cpdata; if (start_block->block == device->blk_data.block_position) return; DBF_LH(4, "Block seek(%06d+%06d)\n", start_block->block, device->bof); start_block->wrap = 0; start_block->segment = 1; start_block->format = (*device->modeset_byte & 0x08) ? TAPE34XX_FMT_3480_XF : TAPE34XX_FMT_3480; start_block->block = start_block->block + device->bof; tape_34xx_merge_sbid(device, start_block); tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata); tape_ccw_cc(request->cpaddr + 2, READ_BLOCK_ID, 8, request->cpdata); } #endif /* * List of 3480/3490 magnetic tape commands. */ static tape_mtop_fn tape_34xx_mtop[TAPE_NR_MTOPS] = { [MTRESET] = tape_std_mtreset, [MTFSF] = tape_std_mtfsf, [MTBSF] = tape_std_mtbsf, [MTFSR] = tape_std_mtfsr, [MTBSR] = tape_std_mtbsr, [MTWEOF] = tape_std_mtweof, [MTREW] = tape_std_mtrew, [MTOFFL] = tape_std_mtoffl, [MTNOP] = tape_std_mtnop, [MTRETEN] = tape_std_mtreten, [MTBSFM] = tape_std_mtbsfm, [MTFSFM] = tape_std_mtfsfm, [MTEOM] = tape_std_mteom, [MTERASE] = tape_std_mterase, [MTRAS1] = NULL, [MTRAS2] = NULL, [MTRAS3] = NULL, [MTSETBLK] = tape_std_mtsetblk, [MTSETDENSITY] = NULL, [MTSEEK] = tape_34xx_mtseek, [MTTELL] = tape_34xx_mttell, [MTSETDRVBUFFER] = NULL, [MTFSS] = NULL, [MTBSS] = NULL, [MTWSM] = NULL, [MTLOCK] = NULL, [MTUNLOCK] = NULL, [MTLOAD] = tape_std_mtload, [MTUNLOAD] = tape_std_mtunload, [MTCOMPRESSION] = tape_std_mtcompression, [MTSETPART] = NULL, [MTMKPART] = NULL }; /* * Tape discipline structure for 3480 and 3490. */ static struct tape_discipline tape_discipline_34xx = { .owner = THIS_MODULE, .setup_device = tape_34xx_setup_device, .cleanup_device = tape_34xx_cleanup_device, .process_eov = tape_std_process_eov, .irq = tape_34xx_irq, .read_block = tape_std_read_block, .write_block = tape_std_write_block, #ifdef CONFIG_S390_TAPE_BLOCK .bread = tape_34xx_bread, .free_bread = tape_34xx_free_bread, .check_locate = tape_34xx_check_locate, #endif .ioctl_fn = tape_34xx_ioctl, .mtop_array = tape_34xx_mtop }; static struct ccw_device_id tape_34xx_ids[] = { { CCW_DEVICE_DEVTYPE(0x3480, 0, 0x3480, 0), .driver_info = tape_3480}, { CCW_DEVICE_DEVTYPE(0x3490, 0, 0x3490, 0), .driver_info = tape_3490}, { /* end of list */ }, }; static int tape_34xx_online(struct ccw_device *cdev) { return tape_generic_online( dev_get_drvdata(&cdev->dev), &tape_discipline_34xx ); } static struct ccw_driver tape_34xx_driver = { .driver = { .name = "tape_34xx", .owner = THIS_MODULE, }, .ids = tape_34xx_ids, .probe = tape_generic_probe, .remove = tape_generic_remove, .set_online = tape_34xx_online, .set_offline = tape_generic_offline, .freeze = tape_generic_pm_suspend, }; static int tape_34xx_init (void) { int rc; TAPE_DBF_AREA = debug_register ( "tape_34xx", 2, 2, 4*sizeof(long)); debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view); #ifdef DBF_LIKE_HELL debug_set_level(TAPE_DBF_AREA, 6); #endif DBF_EVENT(3, "34xx init\n"); /* Register driver for 3480/3490 tapes. */ rc = ccw_driver_register(&tape_34xx_driver); if (rc) DBF_EVENT(3, "34xx init failed\n"); else DBF_EVENT(3, "34xx registered\n"); return rc; } static void tape_34xx_exit(void) { ccw_driver_unregister(&tape_34xx_driver); debug_unregister(TAPE_DBF_AREA); } MODULE_DEVICE_TABLE(ccw, tape_34xx_ids); MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH"); MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape device driver"); MODULE_LICENSE("GPL"); module_init(tape_34xx_init); module_exit(tape_34xx_exit);