kernel-ark/drivers/s390/char/tape_34xx.c
Michael Holzheu 66a464dbc8 [PATCH] s390: debug feature changes
This patch changes the memory allocation method for the s390 debug feature.
Trace buffers had been allocated using the get_free_pages() function before.
Therefore it was not possible to get big memory areas in a running system due
to memory fragmentation.  Now the trace buffers are subdivided into several
subbuffers with pagesize.  Therefore it is now possible to allocate more
memory for the trace buffers and more trace records can be written.

In addition to that, dynamic specification of the size of the trace buffers is
implemented.  It is now possible to change the size of a trace buffer using a
new debugfs file instance.  When writing a number into this file, the trace
buffer size is changed to 'number * pagesize'.

In the past all the traces could be obtained from userspace by accessing files
in the "proc" filesystem.  Now with debugfs we have a new filesystem which
should be used for debugging purposes.  This patch moves the debug feature
from procfs to debugfs.

Since the interface of debug_register() changed, all device drivers, which use
the debug feature had to be adjusted.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 16:24:37 -07:00

1386 lines
38 KiB
C

/*
* drivers/s390/char/tape_34xx.c
* tape device discipline for 3480/3490 tapes.
*
* S390 and zSeries version
* Copyright (C) 2001,2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Carsten Otte <cotte@de.ibm.com>
* Tuan Ngo-Anh <ngoanh@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bio.h>
#include <linux/workqueue.h>
#define TAPE_DBF_AREA tape_34xx_dbf
#include "tape.h"
#include "tape_std.h"
#define PRINTK_HEADER "TAPE_34XX: "
/*
* Pointer to debug area.
*/
debug_info_t *TAPE_DBF_AREA = NULL;
EXPORT_SYMBOL(TAPE_DBF_AREA);
enum tape_34xx_type {
tape_3480,
tape_3490,
};
#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 int
tape_34xx_medium_sense(struct tape_device *device)
{
struct tape_request *request;
unsigned char *sense;
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);
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);
return rc;
}
/*
* 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.
*/
static void
tape_34xx_work_handler(void *data)
{
struct {
struct tape_device *device;
enum tape_op op;
struct work_struct work;
} *p = data;
switch(p->op) {
case TO_MSEN:
tape_34xx_medium_sense(p->device);
break;
default:
DBF_EVENT(3, "T34XX: internal error: unknown work\n");
}
p->device = tape_put_device(p->device);
kfree(p);
}
static int
tape_34xx_schedule_work(struct tape_device *device, enum tape_op op)
{
struct {
struct tape_device *device;
enum tape_op op;
struct work_struct work;
} *p;
if ((p = kmalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
return -ENOMEM;
memset(p, 0, sizeof(*p));
INIT_WORK(&p->work, tape_34xx_work_handler, p);
p->device = tape_get_device_reference(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.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);
PRINT_WARN("Unsolicited IRQ (Device End) caught.\n");
tape_dump_sense(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);
}
if (request->op != TO_RBA)
PRINT_ERR("read_opposite called with state:%s\n",
tape_op_verbose[request->op]);
/*
* 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) {
PRINT_WARN("An unexpected condition #%d was caught in "
"tape error recovery.\n", no);
PRINT_WARN("Please report this incident.\n");
if (request)
PRINT_WARN("Operation of tape:%s\n",
tape_op_verbose[request->op]);
tape_dump_sense(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) {
PRINT_WARN ("Data overrun error between control-unit "
"and drive. Use a faster channel connection, "
"if possible! \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.
*/
PRINT_WARN("Illegal block-id sequence found!\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:
PRINT_ERR("Invalid op in %s:%i\n",
__FUNCTION__, __LINE__);
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 */
PRINT_WARN("Permanent read error\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
PRINT_WARN("Permanent write error\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 */
PRINT_WARN("ID-Mark could not be written.\n");
return tape_34xx_erp_failed(request, -EIO);
case 0x31:
/* Tape void. Tried to read beyond end of device. */
PRINT_WARN("Read beyond end of recorded area.\n");
return tape_34xx_erp_failed(request, -ENOSPC);
case 0x41:
/* Record sequence error. */
PRINT_WARN("Invalid block-id sequence found.\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. */
PRINT_WARN("Non-error sense was found. "
"Unit-check will be ignored.\n");
return TAPE_IO_SUCCESS;
case 0x21:
/*
* Data streaming not operational. CU will switch to
* interlock mode. Reissue the command.
*/
PRINT_WARN("Data streaming not operational. "
"Switching to interlock-mode.\n");
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.
*/
PRINT_WARN("A path equipment check occurred. One of the "
"following conditions occurred:\n");
PRINT_WARN("drive adapter error, buffer error on the lower "
"interface, internal path not usable, error "
"during cartridge load.\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.
*/
PRINT_WARN ("Function incompatible. Try to switch off idrc\n");
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.
*/
PRINT_WARN("Drive not capable processing the tape format!\n");
return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
case 0x30:
/* The medium is write protected. */
PRINT_WARN("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.
PRINT_WARN("The drive lost 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.
*/
PRINT_WARN("Cartridge load failure. Reload the cartridge "
"and try again.\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.
*/
PRINT_WARN("Failure during cartridge unload. "
"Please try manually.\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
*/
PRINT_WARN("Equipment check! Please check the drive and "
"the cartridge loader.\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.
*/
PRINT_WARN("Tape length error.\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. */
PRINT_WARN("Drive not ready. Turn the ready/not ready switch "
"to ready position and try again.\n");
return tape_34xx_erp_failed(request, -EIO);
case 0x3b:
/* Manual rewind or unload. This causes an I/O error. */
PRINT_WARN("Medium was 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.
*/
PRINT_WARN("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;
}
}
PRINT_WARN("The drive is not ready.\n");
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. */
PRINT_WARN("The drive is assigned elsewhere.\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.
*/
PRINT_WARN("The drive is not on-line.");
return tape_34xx_erp_failed(request, -EIO);
case 0x47:
/* Volume fenced. CU reports volume integrity is lost. */
PRINT_WARN("Volume fenced. The volume integrity is lost.\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. */
PRINT_WARN("Bus out check. A data transfer over the bus "
"has been corrupted.\n");
return tape_34xx_erp_failed(request, -EIO);
case 0x4a:
/* Control unit erp failed. */
PRINT_WARN("The control unit I/O error recovery failed.\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.
*/
PRINT_WARN("The drive needs microprogram patches from the "
"control unit, which are not available.\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.
*/
PRINT_WARN("Maximum block size for buffered "
"mode 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). */
PRINT_WARN("A permanent channel interface error occurred.\n");
return tape_34xx_erp_failed(request, -EIO);
case 0x56:
/* Channel protocol error. */
PRINT_WARN("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. */
PRINT_WARN("An attention intercept occurred, "
"which will be recovered.\n");
return tape_34xx_erp_retry(request);
} else {
/* Global status intercept. */
PRINT_WARN("An global status intercept was received, "
"which will be recovered.\n");
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.
*/
PRINT_WARN("Tape Length Incompatible\n");
PRINT_WARN("Tape length exceeds IBM enhanced capacity "
"cartdridge length or a medium\n");
PRINT_WARN("with EC-CST identification mark has been mounted "
"in a device that writes\n");
PRINT_WARN("3480 or 3480 XF format.\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);
PRINT_WARN("Format 3480 XF Incompatible\n");
PRINT_WARN("Medium has been created in 3480 format. "
"To change the format writes\n");
PRINT_WARN("must be issued at BOT.\n");
return tape_34xx_erp_failed(request, -EIO);
case 0x5c:
/* Format 3480-2 XF incompatible */
PRINT_WARN("Format 3480-2 XF Incompatible\n");
PRINT_WARN("Device can only read 3480 or 3480 XF format.\n");
return tape_34xx_erp_failed(request, -EIO);
case 0x5d:
/* Tape length violation. */
PRINT_WARN("Tape Length Violation\n");
PRINT_WARN("The mounted tape exceeds IBM Enhanced Capacity "
"Cartdridge System Tape length.\n");
PRINT_WARN("This may cause damage to the drive or tape when "
"processing to the EOV\n");
return tape_34xx_erp_failed(request, -EMEDIUMTYPE);
case 0x5e:
/* Compaction algorithm incompatible. */
PRINT_WARN("Compaction Algorithm Incompatible\n");
PRINT_WARN("The volume is recorded using an incompatible "
"compaction algorithm,\n");
PRINT_WARN("which is not supported by the device.\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.dstat & DEV_STAT_UNIT_EXCEP) &&
(irb->scsw.dstat & DEV_STAT_DEV_END) &&
(request->op == TO_WRI)) {
/* Write at end of volume */
PRINT_INFO("End of volume\n"); /* XXX */
return tape_34xx_erp_failed(request, -ENOSPC);
}
if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK)
return tape_34xx_unit_check(device, request, irb);
if (irb->scsw.dstat & DEV_STAT_DEV_END) {
/*
* A unit exception occurs on skipping over a tapemark block.
*/
if (irb->scsw.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");
PRINT_ERR("Unexpected interrupt.\n");
PRINT_ERR("Current op is: %s", tape_op_verbose[request->op]);
tape_dump_sense(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, i;
unsigned off;
char *dst;
struct bio_vec *bv;
struct bio *bio;
struct tape_34xx_block_id * start_block;
DBF_EVENT(6, "xBREDid:");
/* Count the number of blocks for the request. */
rq_for_each_bio(bio, req) {
bio_for_each_segment(bv, bio, i) {
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 = req->sector >> 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_bio(bio, req) {
bio_for_each_segment(bv, bio, i) {
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(
cdev->dev.driver_data,
&tape_discipline_34xx
);
}
static int
tape_34xx_offline(struct ccw_device *cdev)
{
return tape_generic_offline(cdev->dev.driver_data);
}
static struct ccw_driver tape_34xx_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_34xx_offline,
};
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: $Revision: 1.23 $\n");
/* Register driver for 3480/3490 tapes. */
rc = ccw_driver_register(&tape_34xx_driver);
if (rc)
DBF_EVENT(3, "34xx init failed\n");
else
DBF_EVENT(3, "34xx registered\n");
return rc;
}
static void
tape_34xx_exit(void)
{
ccw_driver_unregister(&tape_34xx_driver);
debug_unregister(TAPE_DBF_AREA);
}
MODULE_DEVICE_TABLE(ccw, tape_34xx_ids);
MODULE_AUTHOR("(C) 2001-2002 IBM Deutschland Entwicklung GmbH");
MODULE_DESCRIPTION("Linux on zSeries channel attached 3480 tape "
"device driver ($Revision: 1.23 $)");
MODULE_LICENSE("GPL");
module_init(tape_34xx_init);
module_exit(tape_34xx_exit);