diff options
Diffstat (limited to 'drivers/s390/char/tape_34xx.c')
| -rw-r--r-- | drivers/s390/char/tape_34xx.c | 1232 |
1 files changed, 1232 insertions, 0 deletions
diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c new file mode 100644 index 000000000..de69f0ddc --- /dev/null +++ b/drivers/s390/char/tape_34xx.c @@ -0,0 +1,1232 @@ +/* + * 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; + + 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: + /* + * 3480: Attention intercept. + * 3490: 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); +} + +/* + * 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, + .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, + .int_class = IRQIO_TAP, +}; + +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); |