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tape_3590.c
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tape_3590.c
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/*
* drivers/s390/char/tape_3590.c
* tape device discipline for 3590 tapes.
*
* Copyright IBM Corp. 2001,2006
* Author(s): Stefan Bader <shbader@de.ibm.com>
* Michael Holzheu <holzheu@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bio.h>
#include <asm/ebcdic.h>
#define TAPE_DBF_AREA tape_3590_dbf
#include "tape.h"
#include "tape_std.h"
#include "tape_3590.h"
/*
* Pointer to debug area.
*/
debug_info_t *TAPE_DBF_AREA = NULL;
EXPORT_SYMBOL(TAPE_DBF_AREA);
/*******************************************************************
* Error Recovery fuctions:
* - Read Opposite: implemented
* - Read Device (buffered) log: BRA
* - Read Library log: BRA
* - Swap Devices: BRA
* - Long Busy: implemented
* - Special Intercept: BRA
* - Read Alternate: implemented
*******************************************************************/
#define PRINTK_HEADER "TAPE_3590: "
static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
[0x00] = "",
[0x10] = "Lost Sense",
[0x11] = "Assigned Elsewhere",
[0x12] = "Allegiance Reset",
[0x13] = "Shared Access Violation",
[0x20] = "Command Reject",
[0x21] = "Configuration Error",
[0x22] = "Protection Exception",
[0x23] = "Write Protect",
[0x24] = "Write Length",
[0x25] = "Read-Only Format",
[0x31] = "Beginning of Partition",
[0x33] = "End of Partition",
[0x34] = "End of Data",
[0x35] = "Block not found",
[0x40] = "Device Intervention",
[0x41] = "Loader Intervention",
[0x42] = "Library Intervention",
[0x50] = "Write Error",
[0x51] = "Erase Error",
[0x52] = "Formatting Error",
[0x53] = "Read Error",
[0x54] = "Unsupported Format",
[0x55] = "No Formatting",
[0x56] = "Positioning lost",
[0x57] = "Read Length",
[0x60] = "Unsupported Medium",
[0x61] = "Medium Length Error",
[0x62] = "Medium removed",
[0x64] = "Load Check",
[0x65] = "Unload Check",
[0x70] = "Equipment Check",
[0x71] = "Bus out Check",
[0x72] = "Protocol Error",
[0x73] = "Interface Error",
[0x74] = "Overrun",
[0x75] = "Halt Signal",
[0x90] = "Device fenced",
[0x91] = "Device Path fenced",
[0xa0] = "Volume misplaced",
[0xa1] = "Volume inaccessible",
[0xa2] = "Volume in input",
[0xa3] = "Volume ejected",
[0xa4] = "All categories reserved",
[0xa5] = "Duplicate Volume",
[0xa6] = "Library Manager Offline",
[0xa7] = "Library Output Station full",
[0xa8] = "Vision System non-operational",
[0xa9] = "Library Manager Equipment Check",
[0xaa] = "Library Equipment Check",
[0xab] = "All Library Cells full",
[0xac] = "No Cleaner Volumes in Library",
[0xad] = "I/O Station door open",
[0xae] = "Subsystem environmental alert",
};
static int crypt_supported(struct tape_device *device)
{
return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
}
static int crypt_enabled(struct tape_device *device)
{
return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
}
static void ext_to_int_kekl(struct tape390_kekl *in,
struct tape3592_kekl *out)
{
int i;
memset(out, 0, sizeof(*out));
if (in->type == TAPE390_KEKL_TYPE_HASH)
out->flags |= 0x40;
if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
out->flags |= 0x80;
strncpy(out->label, in->label, 64);
for (i = strlen(in->label); i < sizeof(out->label); i++)
out->label[i] = ' ';
ASCEBC(out->label, sizeof(out->label));
}
static void int_to_ext_kekl(struct tape3592_kekl *in,
struct tape390_kekl *out)
{
memset(out, 0, sizeof(*out));
if(in->flags & 0x40)
out->type = TAPE390_KEKL_TYPE_HASH;
else
out->type = TAPE390_KEKL_TYPE_LABEL;
if(in->flags & 0x80)
out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
else
out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
memcpy(out->label, in->label, sizeof(in->label));
EBCASC(out->label, sizeof(in->label));
strstrip(out->label);
}
static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
struct tape390_kekl_pair *out)
{
if (in->count == 0) {
out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
} else if (in->count == 1) {
int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
} else if (in->count == 2) {
int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
} else {
printk("Invalid KEKL number: %d\n", in->count);
BUG();
}
}
static int check_ext_kekl(struct tape390_kekl *kekl)
{
if (kekl->type == TAPE390_KEKL_TYPE_NONE)
goto invalid;
if (kekl->type > TAPE390_KEKL_TYPE_HASH)
goto invalid;
if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
goto invalid;
if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
goto invalid;
if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
(kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
goto invalid;
return 0;
invalid:
return -EINVAL;
}
static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
{
if (check_ext_kekl(&kekls->kekl[0]))
goto invalid;
if (check_ext_kekl(&kekls->kekl[1]))
goto invalid;
return 0;
invalid:
return -EINVAL;
}
/*
* Query KEKLs
*/
static int tape_3592_kekl_query(struct tape_device *device,
struct tape390_kekl_pair *ext_kekls)
{
struct tape_request *request;
struct tape3592_kekl_query_order *order;
struct tape3592_kekl_query_data *int_kekls;
int rc;
DBF_EVENT(6, "tape3592_kekl_query\n");
int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
if (!int_kekls)
return -ENOMEM;
request = tape_alloc_request(2, sizeof(*order));
if (IS_ERR(request)) {
rc = PTR_ERR(request);
goto fail_malloc;
}
order = request->cpdata;
memset(order,0,sizeof(*order));
order->code = 0xe2;
order->max_count = 2;
request->op = TO_KEKL_QUERY;
tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
int_kekls);
rc = tape_do_io(device, request);
if (rc)
goto fail_request;
int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
rc = 0;
fail_request:
tape_free_request(request);
fail_malloc:
kfree(int_kekls);
return rc;
}
/*
* IOCTL: Query KEKLs
*/
static int tape_3592_ioctl_kekl_query(struct tape_device *device,
unsigned long arg)
{
int rc;
struct tape390_kekl_pair *ext_kekls;
DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
if (!crypt_supported(device))
return -ENOSYS;
if (!crypt_enabled(device))
return -EUNATCH;
ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
if (!ext_kekls)
return -ENOMEM;
rc = tape_3592_kekl_query(device, ext_kekls);
if (rc != 0)
goto fail;
if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
rc = -EFAULT;
goto fail;
}
rc = 0;
fail:
kfree(ext_kekls);
return rc;
}
static int tape_3590_mttell(struct tape_device *device, int mt_count);
/*
* Set KEKLs
*/
static int tape_3592_kekl_set(struct tape_device *device,
struct tape390_kekl_pair *ext_kekls)
{
struct tape_request *request;
struct tape3592_kekl_set_order *order;
DBF_EVENT(6, "tape3592_kekl_set\n");
if (check_ext_kekl_pair(ext_kekls)) {
DBF_EVENT(6, "invalid kekls\n");
return -EINVAL;
}
if (tape_3590_mttell(device, 0) != 0)
return -EBADSLT;
request = tape_alloc_request(1, sizeof(*order));
if (IS_ERR(request))
return PTR_ERR(request);
order = request->cpdata;
memset(order, 0, sizeof(*order));
order->code = 0xe3;
order->kekls.count = 2;
ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
request->op = TO_KEKL_SET;
tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
return tape_do_io_free(device, request);
}
/*
* IOCTL: Set KEKLs
*/
static int tape_3592_ioctl_kekl_set(struct tape_device *device,
unsigned long arg)
{
int rc;
struct tape390_kekl_pair *ext_kekls;
DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
if (!crypt_supported(device))
return -ENOSYS;
if (!crypt_enabled(device))
return -EUNATCH;
ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
if (!ext_kekls)
return -ENOMEM;
if (copy_from_user(ext_kekls, (char __user *)arg, sizeof(*ext_kekls))) {
rc = -EFAULT;
goto out;
}
rc = tape_3592_kekl_set(device, ext_kekls);
out:
kfree(ext_kekls);
return rc;
}
/*
* Enable encryption
*/
static int tape_3592_enable_crypt(struct tape_device *device)
{
struct tape_request *request;
char *data;
DBF_EVENT(6, "tape_3592_enable_crypt\n");
if (!crypt_supported(device))
return -ENOSYS;
request = tape_alloc_request(2, 72);
if (IS_ERR(request))
return PTR_ERR(request);
data = request->cpdata;
memset(data,0,72);
data[0] = 0x05;
data[36 + 0] = 0x03;
data[36 + 1] = 0x03;
data[36 + 4] = 0x40;
data[36 + 6] = 0x01;
data[36 + 14] = 0x2f;
data[36 + 18] = 0xc3;
data[36 + 35] = 0x72;
request->op = TO_CRYPT_ON;
tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
return tape_do_io_free(device, request);
}
/*
* Disable encryption
*/
static int tape_3592_disable_crypt(struct tape_device *device)
{
struct tape_request *request;
char *data;
DBF_EVENT(6, "tape_3592_disable_crypt\n");
if (!crypt_supported(device))
return -ENOSYS;
request = tape_alloc_request(2, 72);
if (IS_ERR(request))
return PTR_ERR(request);
data = request->cpdata;
memset(data,0,72);
data[0] = 0x05;
data[36 + 0] = 0x03;
data[36 + 1] = 0x03;
data[36 + 35] = 0x32;
request->op = TO_CRYPT_OFF;
tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
return tape_do_io_free(device, request);
}
/*
* IOCTL: Set encryption status
*/
static int tape_3592_ioctl_crypt_set(struct tape_device *device,
unsigned long arg)
{
struct tape390_crypt_info info;
DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
if (!crypt_supported(device))
return -ENOSYS;
if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
return -EFAULT;
if (info.status & ~TAPE390_CRYPT_ON_MASK)
return -EINVAL;
if (info.status & TAPE390_CRYPT_ON_MASK)
return tape_3592_enable_crypt(device);
else
return tape_3592_disable_crypt(device);
}
static int tape_3590_sense_medium(struct tape_device *device);
/*
* IOCTL: Query enryption status
*/
static int tape_3592_ioctl_crypt_query(struct tape_device *device,
unsigned long arg)
{
DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
if (!crypt_supported(device))
return -ENOSYS;
tape_3590_sense_medium(device);
if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
sizeof(TAPE_3590_CRYPT_INFO(device))))
return -EFAULT;
else
return 0;
}
/*
* 3590 IOCTL Overload
*/
static int
tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case TAPE390_DISPLAY: {
struct display_struct disp;
if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)))
return -EFAULT;
return tape_std_display(device, &disp);
}
case TAPE390_KEKL_SET:
return tape_3592_ioctl_kekl_set(device, arg);
case TAPE390_KEKL_QUERY:
return tape_3592_ioctl_kekl_query(device, arg);
case TAPE390_CRYPT_SET:
return tape_3592_ioctl_crypt_set(device, arg);
case TAPE390_CRYPT_QUERY:
return tape_3592_ioctl_crypt_query(device, arg);
default:
return -EINVAL; /* no additional ioctls */
}
}
/*
* SENSE Medium: Get Sense data about medium state
*/
static int
tape_3590_sense_medium(struct tape_device *device)
{
struct tape_request *request;
request = tape_alloc_request(1, 128);
if (IS_ERR(request))
return PTR_ERR(request);
request->op = TO_MSEN;
tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
return tape_do_io_free(device, request);
}
/*
* MTTELL: Tell block. Return the number of block relative to current file.
*/
static int
tape_3590_mttell(struct tape_device *device, int mt_count)
{
__u64 block_id;
int rc;
rc = tape_std_read_block_id(device, &block_id);
if (rc)
return rc;
return block_id >> 32;
}
/*
* MTSEEK: seek to the specified block.
*/
static int
tape_3590_mtseek(struct tape_device *device, int count)
{
struct tape_request *request;
DBF_EVENT(6, "xsee id: %x\n", count);
request = tape_alloc_request(3, 4);
if (IS_ERR(request))
return PTR_ERR(request);
request->op = TO_LBL;
tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
*(__u32 *) request->cpdata = count;
tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
return tape_do_io_free(device, request);
}
/*
* Read Opposite Error Recovery Function:
* Used, when Read Forward does not work
*/
static void
tape_3590_read_opposite(struct tape_device *device,
struct tape_request *request)
{
struct tape_3590_disc_data *data;
/*
* We have allocated 4 ccws in tape_std_read, so we can now
* transform the request to a read backward, followed by a
* forward space block.
*/
request->op = TO_RBA;
tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
data = device->discdata;
tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op,
device->char_data.idal_buf);
tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
DBF_EVENT(6, "xrop ccwg\n");
}
/*
* Read Attention Msg
* This should be done after an interrupt with attention bit (0x80)
* in device state.
*
* After a "read attention message" request there are two possible
* results:
*
* 1. A unit check is presented, when attention sense is present (e.g. when
* a medium has been unloaded). The attention sense comes then
* together with the unit check. The recovery action is either "retry"
* (in case there is an attention message pending) or "permanent error".
*
* 2. The attention msg is written to the "read subsystem data" buffer.
* In this case we probably should print it to the console.
*/
static int
tape_3590_read_attmsg(struct tape_device *device)
{
struct tape_request *request;
char *buf;
request = tape_alloc_request(3, 4096);
if (IS_ERR(request))
return PTR_ERR(request);
request->op = TO_READ_ATTMSG;
buf = request->cpdata;
buf[0] = PREP_RD_SS_DATA;
buf[6] = RD_ATTMSG; /* read att msg */
tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf);
tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12);
tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
return tape_do_io_free(device, request);
}
/*
* These functions are used to schedule follow-up actions from within an
* interrupt context (like unsolicited interrupts).
*/
struct work_handler_data {
struct tape_device *device;
enum tape_op op;
struct work_struct work;
};
static void
tape_3590_work_handler(struct work_struct *work)
{
struct work_handler_data *p =
container_of(work, struct work_handler_data, work);
switch (p->op) {
case TO_MSEN:
tape_3590_sense_medium(p->device);
break;
case TO_READ_ATTMSG:
tape_3590_read_attmsg(p->device);
break;
case TO_CRYPT_ON:
tape_3592_enable_crypt(p->device);
break;
case TO_CRYPT_OFF:
tape_3592_disable_crypt(p->device);
break;
default:
DBF_EVENT(3, "T3590: work handler undefined for "
"operation 0x%02x\n", p->op);
}
tape_put_device(p->device);
kfree(p);
}
static int
tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
{
struct work_handler_data *p;
if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
return -ENOMEM;
INIT_WORK(&p->work, tape_3590_work_handler);
p->device = tape_get_device_reference(device);
p->op = op;
schedule_work(&p->work);
return 0;
}
#ifdef CONFIG_S390_TAPE_BLOCK
/*
* Tape Block READ
*/
static struct tape_request *
tape_3590_bread(struct tape_device *device, struct request *req)
{
struct tape_request *request;
struct ccw1 *ccw;
int count = 0, start_block;
unsigned off;
char *dst;
struct bio_vec *bv;
struct req_iterator iter;
DBF_EVENT(6, "xBREDid:");
start_block = req->sector >> TAPEBLOCK_HSEC_S2B;
DBF_EVENT(6, "start_block = %i\n", start_block);
rq_for_each_segment(bv, req, iter)
count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
request = tape_alloc_request(2 + count + 1, 4);
if (IS_ERR(request))
return request;
request->op = TO_BLOCK;
*(__u32 *) request->cpdata = start_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.
*/
ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
rq_for_each_segment(bv, req, iter) {
dst = page_address(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;
}
if (off > bv->bv_len)
BUG();
}
ccw = tape_ccw_end(ccw, NOP, 0, NULL);
DBF_EVENT(6, "xBREDccwg\n");
return request;
}
static void
tape_3590_free_bread(struct tape_request *request)
{
struct ccw1 *ccw;
/* Last ccw is a nop and doesn't need clear_normalized_cda */
for (ccw = request->cpaddr; 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_3590_check_locate(struct tape_device *device, struct tape_request *request)
{
__u32 *start_block;
start_block = (__u32 *) request->cpdata;
if (*start_block != device->blk_data.block_position) {
/* Add the start offset of the file to get the real block. */
*start_block += device->bof;
tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
}
}
#endif
static void tape_3590_med_state_set(struct tape_device *device,
struct tape_3590_med_sense *sense)
{
struct tape390_crypt_info *c_info;
c_info = &TAPE_3590_CRYPT_INFO(device);
DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst);
switch (sense->macst) {
case 0x04:
case 0x05:
case 0x06:
tape_med_state_set(device, MS_UNLOADED);
TAPE_3590_CRYPT_INFO(device).medium_status = 0;
return;
case 0x08:
case 0x09:
tape_med_state_set(device, MS_LOADED);
break;
default:
tape_med_state_set(device, MS_UNKNOWN);
return;
}
c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
if (sense->flags & MSENSE_CRYPT_MASK) {
PRINT_INFO("Medium is encrypted (%04x)\n", sense->flags);
c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
} else {
DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
}
}
/*
* The done handler is called at device/channel end and wakes up the sleeping
* process
*/
static int
tape_3590_done(struct tape_device *device, struct tape_request *request)
{
struct tape_3590_disc_data *disc_data;
DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
disc_data = device->discdata;
switch (request->op) {
case TO_BSB:
case TO_BSF:
case TO_DSE:
case TO_FSB:
case TO_FSF:
case TO_LBL:
case TO_RFO:
case TO_RBA:
case TO_REW:
case TO_WRI:
case TO_WTM:
case TO_BLOCK:
case TO_LOAD:
tape_med_state_set(device, MS_LOADED);
break;
case TO_RUN:
tape_med_state_set(device, MS_UNLOADED);
tape_3590_schedule_work(device, TO_CRYPT_OFF);
break;
case TO_MSEN:
tape_3590_med_state_set(device, request->cpdata);
break;
case TO_CRYPT_ON:
TAPE_3590_CRYPT_INFO(device).status
|= TAPE390_CRYPT_ON_MASK;
*(device->modeset_byte) |= 0x03;
break;
case TO_CRYPT_OFF:
TAPE_3590_CRYPT_INFO(device).status
&= ~TAPE390_CRYPT_ON_MASK;
*(device->modeset_byte) &= ~0x03;
break;
case TO_RBI: /* RBI seems to succeed even without medium loaded. */
case TO_NOP: /* Same to NOP. */
case TO_READ_CONFIG:
case TO_READ_ATTMSG:
case TO_DIS:
case TO_ASSIGN:
case TO_UNASSIGN:
case TO_SIZE:
case TO_KEKL_SET:
case TO_KEKL_QUERY:
case TO_RDC:
break;
}
return TAPE_IO_SUCCESS;
}
/*
* This fuction is called, when error recovery was successfull
*/
static inline int
tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
{
DBF_EVENT(3, "Error Recovery successfull for %s\n",
tape_op_verbose[request->op]);
return tape_3590_done(device, request);
}
/*
* This fuction is called, when error recovery was not successfull
*/
static inline int
tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
struct irb *irb, int rc)
{
DBF_EVENT(3, "Error Recovery failed for %s\n",
tape_op_verbose[request->op]);
tape_dump_sense_dbf(device, request, irb);
return rc;
}
/*
* Error Recovery do retry
*/
static inline int
tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
struct irb *irb)
{
DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
tape_dump_sense_dbf(device, request, irb);
return TAPE_IO_RETRY;
}
/*
* Handle unsolicited interrupts
*/
static int
tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
{
if (irb->scsw.cmd.dstat == DEV_STAT_CHN_END)
/* Probably result of halt ssch */
return TAPE_IO_PENDING;
else if (irb->scsw.cmd.dstat == 0x85)
/* Device Ready */
DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id);
else if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
tape_3590_schedule_work(device, TO_READ_ATTMSG);
} 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);
}
/* check medium state */
tape_3590_schedule_work(device, TO_MSEN);
return TAPE_IO_SUCCESS;
}
/*
* Basic Recovery routine
*/
static int
tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
struct irb *irb, int rc)
{
struct tape_3590_sense *sense;
sense = (struct tape_3590_sense *) irb->ecw;
switch (sense->bra) {
case SENSE_BRA_PER:
return tape_3590_erp_failed(device, request, irb, rc);
case SENSE_BRA_CONT:
return tape_3590_erp_succeded(device, request);
case SENSE_BRA_RE:
return tape_3590_erp_retry(device, request, irb);
case SENSE_BRA_DRE:
return tape_3590_erp_failed(device, request, irb, rc);
default:
PRINT_ERR("Unknown BRA %x - This should not happen!\n",
sense->bra);
BUG();
return TAPE_IO_STOP;
}
}
/*
* RDL: Read Device (buffered) log
*/
static int
tape_3590_erp_read_buf_log(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
/*
* We just do the basic error recovery at the moment (retry).
* Perhaps in the future, we read the log and dump it somewhere...
*/
return tape_3590_erp_basic(device, request, irb, -EIO);
}
/*
* SWAP: Swap Devices
*/
static int
tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
struct irb *irb)
{
/*
* This error recovery should swap the tapes
* if the original has a problem. The operation
* should proceed with the new tape... this
* should probably be done in user space!
*/
PRINT_WARN("(%s): Swap Tape Device!\n", dev_name(&device->cdev->dev));
return tape_3590_erp_basic(device, request, irb, -EIO);
}
/*
* LBY: Long Busy
*/
static int
tape_3590_erp_long_busy(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
DBF_EVENT(6, "Device is busy\n");
return TAPE_IO_LONG_BUSY;
}
/*
* SPI: Special Intercept
*/
static int
tape_3590_erp_special_interrupt(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
return tape_3590_erp_basic(device, request, irb, -EIO);
}
/*
* RDA: Read Alternate
*/
static int
tape_3590_erp_read_alternate(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
struct tape_3590_disc_data *data;
/*
* The issued Read Backward or Read Previous command is not
* supported by the device
* The recovery action should be to issue another command:
* Read Revious: if Read Backward is not supported
* Read Backward: if Read Previous is not supported
*/
data = device->discdata;
if (data->read_back_op == READ_PREVIOUS) {
DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
device->cdev_id);
data->read_back_op = READ_BACKWARD;
} else {
DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
device->cdev_id);
data->read_back_op = READ_PREVIOUS;
}
tape_3590_read_opposite(device, request);
return tape_3590_erp_retry(device, request, irb);
}
/*
* Error Recovery read opposite
*/
static int
tape_3590_erp_read_opposite(struct tape_device *device,
struct tape_request *request, struct irb *irb)
{
switch (request->op) {
case TO_RFO:
/*
* We did read forward, but the data could not be read.
* We will read backward and then skip forward again.
*/
tape_3590_read_opposite(device, request);
return tape_3590_erp_retry(device, request, irb);
case TO_RBA:
/* We tried to read forward and backward, but hat no success */
return tape_3590_erp_failed(device, request, irb, -EIO);
break;
default:
PRINT_WARN("read_opposite_recovery_called_with_op: %s\n",
tape_op_verbose[request->op]);
return tape_3590_erp_failed(device, request, irb, -EIO);
}
}
/*
* Print an MIM (Media Information Message) (message code f0)
*/
static void
tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
{
struct tape_3590_sense *sense;