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[PATCH] s390: 64 bit diag250 support 

Add support for diag 250 access to dasd devices for 64 bit kernels.  In
addition fix detach/attach for diag disks.  The VM control block needs to get
recreated by a call to mdsk_init_io.

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
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>
This commit is contained in:
Horst Hummel 2005-09-03 15:58:00 -07:00 committed by Linus Torvalds
parent c6eb7b7703
commit fd49f41aa0
3 changed files with 306 additions and 133 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/s390/block/Kconfig
View File

@ -49,7 +49,7 @@ config DASD_FBA
config DASD_DIAG
tristate "Support for DIAG access to Disks"
depends on DASD && ARCH_S390X = 'n'
depends on DASD && ( ARCH_S390X = 'n' || EXPERIMENTAL)
help
Select this option if you want to use Diagnose250 command to access
Disks under VM. If you are not running under VM or unsure what it is,

332
drivers/s390/block/dasd_diag.c
View File

@ -6,17 +6,18 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.42 $
* $Revision: 1.49 $
*/
#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hdreg.h> /* HDIO_GETGEO */
#include <linux/hdreg.h>
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <asm/dasd.h>
#include <asm/debug.h>
@ -28,58 +29,89 @@
#include "dasd_int.h"
#include "dasd_diag.h"
#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif /* PRINTK_HEADER */
#define PRINTK_HEADER "dasd(diag):"
MODULE_LICENSE("GPL");
/* The maximum number of blocks per request (max_blocks) is dependent on the
* amount of storage that is available in the static I/O buffer for each
* device. Currently each device gets 2 pages. We want to fit two requests
* into the available memory so that we can immediately start the next if one
* finishes. */
#define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
sizeof(struct dasd_diag_req)) / \
sizeof(struct dasd_diag_bio)) / 2)
#define DIAG_MAX_RETRIES 32
#define DIAG_TIMEOUT 50 * HZ
struct dasd_discipline dasd_diag_discipline;
struct dasd_diag_private {
struct dasd_diag_characteristics rdc_data;
struct dasd_diag_rw_io iob;
struct dasd_diag_init_io iib;
unsigned int pt_block;
blocknum_t pt_block;
};
struct dasd_diag_req {
int block_count;
unsigned int block_count;
struct dasd_diag_bio bio[0];
};
static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
/* Perform DIAG250 call with block I/O parameter list iob (input and output)
* and function code cmd.
* In case of an exception return 3. Otherwise return result of bitwise OR of
* resulting condition code and DIAG return code. */
static __inline__ int
dia250(void *iob, int cmd)
{
typedef struct {
char _[max(sizeof (struct dasd_diag_init_io),
sizeof (struct dasd_diag_rw_io))];
} addr_type;
int rc;
__asm__ __volatile__(" lhi %0,3\n"
" lr 0,%2\n"
" diag 0,%1,0x250\n"
"0: ipm %0\n"
" srl %0,28\n"
" or %0,1\n"
"1:\n"
#ifndef CONFIG_ARCH_S390X
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,1b\n"
".previous\n"
__asm__ __volatile__(
#ifdef CONFIG_ARCH_S390X
" lghi %0,3\n"
" lgr 0,%3\n"
" diag 0,%2,0x250\n"
"0: ipm %0\n"
" srl %0,28\n"
" or %0,1\n"
"1:\n"
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,1b\n"
".previous\n"
#else
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,1b\n"
".previous\n"
" lhi %0,3\n"
" lr 0,%3\n"
" diag 0,%2,0x250\n"
"0: ipm %0\n"
" srl %0,28\n"
" or %0,1\n"
"1:\n"
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,1b\n"
".previous\n"
#endif
: "=&d" (rc)
: "d" (cmd), "d" ((void *) __pa(iob))
: "0", "1", "cc");
: "=&d" (rc), "=m" (*(addr_type *) iob)
: "d" (cmd), "d" (iob), "m" (*(addr_type *) iob)
: "0", "1", "cc");
return rc;
}
/* Initialize block I/O to DIAG device using the specified blocksize and
* block offset. On success, return zero and set end_block to contain the
* number of blocks on the device minus the specified offset. Return non-zero
* otherwise. */
static __inline__ int
mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size)
mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
blocknum_t offset, blocknum_t *end_block)
{
struct dasd_diag_private *private;
struct dasd_diag_init_io *iib;
@ -92,14 +124,18 @@ mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size)
iib->dev_nr = _ccw_device_get_device_number(device->cdev);
iib->block_size = blocksize;
iib->offset = offset;
iib->start_block = 0;
iib->end_block = size;
iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
rc = dia250(iib, INIT_BIO);
return rc & 3;
if ((rc & 3) == 0 && end_block)
*end_block = iib->end_block;
return rc;
}
/* Remove block I/O environment for device. Return zero on success, non-zero
* otherwise. */
static __inline__ int
mdsk_term_io(struct dasd_device * device)
{
@ -112,9 +148,25 @@ mdsk_term_io(struct dasd_device * device)
memset(iib, 0, sizeof (struct dasd_diag_init_io));
iib->dev_nr = _ccw_device_get_device_number(device->cdev);
rc = dia250(iib, TERM_BIO);
return rc & 3;
return rc;
}
/* Error recovery for failed DIAG requests - try to reestablish the DIAG
* environment. */
static void
dasd_diag_erp(struct dasd_device *device)
{
int rc;
mdsk_term_io(device);
rc = mdsk_init_io(device, device->bp_block, 0, NULL);
if (rc)
DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, "
"rc=%d", rc);
}
/* Start a given request at the device. Return zero on success, non-zero
* otherwise. */
static int
dasd_start_diag(struct dasd_ccw_req * cqr)
{
@ -124,32 +176,66 @@ dasd_start_diag(struct dasd_ccw_req * cqr)
int rc;
device = cqr->device;
if (cqr->retries < 0) {
DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p "
"- no retry left)", cqr);
cqr->status = DASD_CQR_FAILED;
return -EIO;
}
private = (struct dasd_diag_private *) device->private;
dreq = (struct dasd_diag_req *) cqr->data;
private->iob.dev_nr = _ccw_device_get_device_number(device->cdev);
private->iob.key = 0;
private->iob.flags = 2; /* do asynchronous io */
private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
private->iob.block_count = dreq->block_count;
private->iob.interrupt_params = (u32)(addr_t) cqr;
private->iob.interrupt_params = (addr_t) cqr;
private->iob.bio_list = __pa(dreq->bio);
private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
cqr->startclk = get_clock();
cqr->starttime = jiffies;
cqr->retries--;
rc = dia250(&private->iob, RW_BIO);
if (rc > 8) {
DEV_MESSAGE(KERN_WARNING, device, "dia250 returned CC %d", rc);
cqr->status = DASD_CQR_ERROR;
} else if (rc == 0) {
switch (rc) {
case 0: /* Synchronous I/O finished successfully */
cqr->stopclk = get_clock();
cqr->status = DASD_CQR_DONE;
dasd_schedule_bh(device);
} else {
/* Indicate to calling function that only a dasd_schedule_bh()
and no timer is needed */
rc = -EACCES;
break;
case 8: /* Asynchronous I/O was started */
cqr->status = DASD_CQR_IN_IO;
rc = 0;
break;
default: /* Error condition */
cqr->status = DASD_CQR_QUEUED;
DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc);
dasd_diag_erp(device);
rc = -EIO;
break;
}
return rc;
}
/* Terminate given request at the device. */
static int
dasd_diag_term_IO(struct dasd_ccw_req * cqr)
{
struct dasd_device *device;
device = cqr->device;
mdsk_term_io(device);
mdsk_init_io(device, device->bp_block, 0, NULL);
cqr->status = DASD_CQR_CLEAR;
cqr->stopclk = get_clock();
dasd_schedule_bh(device);
return 0;
}
/* Handle external interruption. */
static void
dasd_ext_handler(struct pt_regs *regs, __u16 code)
{
@ -157,25 +243,27 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code)
struct dasd_device *device;
unsigned long long expires;
unsigned long flags;
char status;
int ip;
u8 int_code, status;
addr_t ip;
int rc;
/*
* Get the external interruption subcode. VM stores
* this in the 'cpu address' field associated with
* the external interrupt. For diag 250 the subcode
* needs to be 3.
*/
if ((S390_lowcore.cpu_addr & 0xff00) != 0x0300)
int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
switch (int_code) {
case DASD_DIAG_CODE_31BIT:
ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
break;
case DASD_DIAG_CODE_64BIT:
ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
break;
default:
return;
status = *((char *) &S390_lowcore.ext_params + 5);
ip = S390_lowcore.ext_params;
}
if (!ip) { /* no intparm: unsolicited interrupt */
MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt");
return;
}
cqr = (struct dasd_ccw_req *)(addr_t) ip;
cqr = (struct dasd_ccw_req *) ip;
device = (struct dasd_device *) cqr->device;
if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
DEV_MESSAGE(KERN_WARNING, device,
@ -188,6 +276,15 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code)
/* get irq lock to modify request queue */
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
/* Check for a pending clear operation */
if (cqr->status == DASD_CQR_CLEAR) {
cqr->status = DASD_CQR_QUEUED;
dasd_clear_timer(device);
dasd_schedule_bh(device);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
return;
}
cqr->stopclk = get_clock();
expires = 0;
@ -198,16 +295,22 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code)
next = list_entry(device->ccw_queue.next,
struct dasd_ccw_req, list);
if (next->status == DASD_CQR_QUEUED) {
if (dasd_start_diag(next) == 0)
rc = dasd_start_diag(next);
if (rc == 0)
expires = next->expires;
else
else if (rc != -EACCES)
DEV_MESSAGE(KERN_WARNING, device, "%s",
"Interrupt fastpath "
"failed!");
}
}
} else
cqr->status = DASD_CQR_FAILED;
} else {
cqr->status = DASD_CQR_QUEUED;
DEV_MESSAGE(KERN_WARNING, device, "interrupt status for "
"request %p was %d (%d retries left)", cqr, status,
cqr->retries);
dasd_diag_erp(device);
}
if (expires != 0)
dasd_set_timer(device, expires);
@ -218,14 +321,17 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code)
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
/* Check whether device can be controlled by DIAG discipline. Return zero on
* success, non-zero otherwise. */
static int
dasd_diag_check_device(struct dasd_device *device)
{
struct dasd_diag_private *private;
struct dasd_diag_characteristics *rdc_data;
struct dasd_diag_bio bio;
long *label;
int sb, bsize;
struct dasd_diag_cms_label *label;
blocknum_t end_block;
unsigned int sb, bsize;
int rc;
private = (struct dasd_diag_private *) device->private;
@ -244,8 +350,11 @@ dasd_diag_check_device(struct dasd_device *device)
rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
rc = diag210((struct diag210 *) rdc_data);
if (rc)
if (rc) {
DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device "
"information (rc=%d)", rc);
return -ENOTSUPP;
}
/* Figure out position of label block */
switch (private->rdc_data.vdev_class) {
@ -256,6 +365,8 @@ dasd_diag_check_device(struct dasd_device *device)
private->pt_block = 2;
break;
default:
DEV_MESSAGE(KERN_WARNING, device, "unsupported device class "
"(class=%d)", private->rdc_data.vdev_class);
return -ENOTSUPP;
}
@ -269,15 +380,17 @@ dasd_diag_check_device(struct dasd_device *device)
mdsk_term_io(device);
/* figure out blocksize of device */
label = (long *) get_zeroed_page(GFP_KERNEL);
label = (struct dasd_diag_cms_label *) get_zeroed_page(GFP_KERNEL);
if (label == NULL) {
DEV_MESSAGE(KERN_WARNING, device, "%s",
"No memory to allocate initialization request");
return -ENOMEM;
}
rc = 0;
end_block = 0;
/* try all sizes - needed for ECKD devices */
for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
mdsk_init_io(device, bsize, 0, 64);
mdsk_init_io(device, bsize, 0, &end_block);
memset(&bio, 0, sizeof (struct dasd_diag_bio));
bio.type = MDSK_READ_REQ;
bio.block_number = private->pt_block + 1;
@ -289,37 +402,45 @@ dasd_diag_check_device(struct dasd_device *device)
private->iob.block_count = 1;
private->iob.interrupt_params = 0;
private->iob.bio_list = __pa(&bio);
if (dia250(&private->iob, RW_BIO) == 0)
private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
rc = dia250(&private->iob, RW_BIO);
if (rc == 0 || rc == 3)
break;
mdsk_term_io(device);
}
if (bsize <= PAGE_SIZE && label[0] == 0xc3d4e2f1) {
/* get formatted blocksize from label block */
bsize = (int) label[3];
device->blocks = label[7];
if (rc == 3) {
DEV_MESSAGE(KERN_WARNING, device, "%s", "DIAG call failed");
rc = -EOPNOTSUPP;
} else if (rc != 0) {
DEV_MESSAGE(KERN_WARNING, device, "device access failed "
"(rc=%d)", rc);
rc = -EIO;
} else {
if (memcmp(label->label_id, DASD_DIAG_CMS1,
sizeof(DASD_DIAG_CMS1)) == 0) {
/* get formatted blocksize from label block */
bsize = (unsigned int) label->block_size;
device->blocks = (unsigned long) label->block_count;
} else
device->blocks = end_block;
device->bp_block = bsize;
device->s2b_shift = 0; /* bits to shift 512 to get a block */
for (sb = 512; sb < bsize; sb = sb << 1)
device->s2b_shift++;
DEV_MESSAGE(KERN_INFO, device,
"capacity (%dkB blks): %ldkB",
(device->bp_block >> 10),
(device->blocks << device->s2b_shift) >> 1);
"(%ld B/blk): %ldkB",
(unsigned long) device->bp_block,
(unsigned long) (device->blocks <<
device->s2b_shift) >> 1);
rc = 0;
} else {
if (bsize > PAGE_SIZE)
DEV_MESSAGE(KERN_WARNING, device, "%s",
"DIAG access failed");
else
DEV_MESSAGE(KERN_WARNING, device, "%s",
"volume is not CMS formatted");
rc = -EMEDIUMTYPE;
}
free_page((long) label);
return rc;
}
/* Fill in virtual disk geometry for device. Return zero on success, non-zero
* otherwise. */
static int
dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
{
@ -349,6 +470,8 @@ dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
return dasd_default_erp_postaction;
}
/* Create DASD request from block device request. Return pointer to new
* request on success, ERR_PTR otherwise. */
static struct dasd_ccw_req *
dasd_diag_build_cp(struct dasd_device * device, struct request *req)
{
@ -358,9 +481,9 @@ dasd_diag_build_cp(struct dasd_device * device, struct request *req)
struct bio *bio;
struct bio_vec *bv;
char *dst;
int count, datasize;
unsigned int count, datasize;
sector_t recid, first_rec, last_rec;
unsigned blksize, off;
unsigned int blksize, off;
unsigned char rw_cmd;
int i;
@ -413,13 +536,16 @@ dasd_diag_build_cp(struct dasd_device * device, struct request *req)
}
}
}
cqr->retries = DIAG_MAX_RETRIES;
cqr->buildclk = get_clock();
cqr->device = device;
cqr->expires = 50 * HZ; /* 50 seconds */
cqr->expires = DIAG_TIMEOUT;
cqr->status = DASD_CQR_FILLED;
return cqr;
}
/* Release DASD request. Return non-zero if request was successful, zero
* otherwise. */
static int
dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
{
@ -430,6 +556,7 @@ dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
return status;
}
/* Fill in IOCTL data for device. */
static int
dasd_diag_fill_info(struct dasd_device * device,
struct dasd_information2_t * info)
@ -437,7 +564,7 @@ dasd_diag_fill_info(struct dasd_device * device,
struct dasd_diag_private *private;
private = (struct dasd_diag_private *) device->private;
info->label_block = private->pt_block;
info->label_block = (unsigned int) private->pt_block;
info->FBA_layout = 1;
info->format = DASD_FORMAT_LDL;
info->characteristics_size = sizeof (struct dasd_diag_characteristics);
@ -456,26 +583,15 @@ dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
"dump sense not available for DIAG data");
}
/*
* max_blocks is dependent on the amount of storage that is available
* in the static io buffer for each device. Currently each device has
* 8192 bytes (=2 pages). dasd diag is only relevant for 31 bit.
* The struct dasd_ccw_req has 96 bytes, the struct dasd_diag_req has
* 8 bytes and the struct dasd_diag_bio for each block has 16 bytes.
* That makes:
* (8192 - 96 - 8) / 16 = 505.5 blocks at maximum.
* We want to fit two into the available memory so that we can immediately
* start the next request if one finishes off. That makes 252.75 blocks
* for one request. Give a little safety and the result is 240.
*/
struct dasd_discipline dasd_diag_discipline = {
.owner = THIS_MODULE,
.name = "DIAG",
.ebcname = "DIAG",
.max_blocks = 240,
.max_blocks = DIAG_MAX_BLOCKS,
.check_device = dasd_diag_check_device,
.fill_geometry = dasd_diag_fill_geometry,
.start_IO = dasd_start_diag,
.term_IO = dasd_diag_term_IO,
.examine_error = dasd_diag_examine_error,
.erp_action = dasd_diag_erp_action,
.erp_postaction = dasd_diag_erp_postaction,
@ -493,7 +609,7 @@ dasd_diag_init(void)
"Machine is not VM: %s "
"discipline not initializing",
dasd_diag_discipline.name);
return -EINVAL;
return -ENODEV;
}
ASCEBC(dasd_diag_discipline.ebcname, 4);
@ -506,13 +622,6 @@ dasd_diag_init(void)
static void __exit
dasd_diag_cleanup(void)
{
if (!MACHINE_IS_VM) {
MESSAGE_LOG(KERN_INFO,
"Machine is not VM: %s "
"discipline not cleaned",
dasd_diag_discipline.name);
return;
}
unregister_external_interrupt(0x2603, dasd_ext_handler);
ctl_clear_bit(0, 9);
dasd_diag_discipline_pointer = NULL;
@ -520,22 +629,3 @@ dasd_diag_cleanup(void)
module_init(dasd_diag_init);
module_exit(dasd_diag_cleanup);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-indent-level: 4
* c-brace-imaginary-offset: 0
* c-brace-offset: -4
* c-argdecl-indent: 4
* c-label-offset: -4
* c-continued-statement-offset: 4
* c-continued-brace-offset: 0
* indent-tabs-mode: 1
* tab-width: 8
* End:
*/

105
drivers/s390/block/dasd_diag.h
View File

@ -6,7 +6,7 @@
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.6 $
* $Revision: 1.7 $
*/
#define MDSK_WRITE_REQ 0x01
@ -19,6 +19,18 @@
#define DEV_CLASS_FBA 0x01
#define DEV_CLASS_ECKD 0x04
#define DASD_DIAG_LC_INT_CODE 132
#define DASD_DIAG_LC_INT_STATUS 133
#define DASD_DIAG_LC_INT_PARM_31BIT 128
#define DASD_DIAG_LC_INT_PARM_64BIT 4536
#define DASD_DIAG_CODE_31BIT 0x03
#define DASD_DIAG_CODE_64BIT 0x07
#define DASD_DIAG_RWFLAG_ASYNC 0x02
#define DASD_DIAG_RWFLAG_NOCACHE 0x01
#define DASD_DIAG_FLAGA_FORMAT_64BIT 0x80
struct dasd_diag_characteristics {
u16 dev_nr;
u16 rdc_len;
@ -32,35 +44,106 @@ struct dasd_diag_characteristics {
u8 rdev_features;
} __attribute__ ((packed, aligned(4)));
struct dasd_diag_cms_label {
u8 label_id[4];
u8 vol_id[6];
u16 version_id;
u32 block_size;
u32 origin_ptr;
u32 usable_count;
u32 formatted_count;
u32 block_count;
u32 used_count;
u32 fst_size;
u32 fst_count;
u8 format_date[6];
u8 reserved1[2];
u32 disk_offset;
u32 map_block;
u32 hblk_disp;
u32 user_disp;
u8 reserved2[4];
u8 segment_name[8];
} __attribute__ ((packed));
#ifdef CONFIG_ARCH_S390X
#define DASD_DIAG_FLAGA_DEFAULT DASD_DIAG_FLAGA_FORMAT_64BIT
typedef u64 blocknum_t;
typedef s64 sblocknum_t;
struct dasd_diag_bio {
u8 type;
u8 status;
u8 spare1[2];
u32 alet;
blocknum_t block_number;
u64 buffer;
} __attribute__ ((packed, aligned(8)));
struct dasd_diag_init_io {
u16 dev_nr;
u8 flaga;
u8 spare1[21];
u32 block_size;
u8 spare2[4];
blocknum_t offset;
sblocknum_t start_block;
blocknum_t end_block;
u8 spare3[8];
} __attribute__ ((packed, aligned(8)));
struct dasd_diag_rw_io {
u16 dev_nr;
u8 flaga;
u8 spare1[21];
u8 key;
u8 flags;
u8 spare2[2];
u32 block_count;
u32 alet;
u8 spare3[4];
u64 interrupt_params;
u64 bio_list;
u8 spare4[8];
} __attribute__ ((packed, aligned(8)));
#else /* CONFIG_ARCH_S390X */
#define DASD_DIAG_FLAGA_DEFAULT 0x0
typedef u32 blocknum_t;
typedef s32 sblocknum_t;
struct dasd_diag_bio {
u8 type;
u8 status;
u16 spare1;
u32 block_number;
blocknum_t block_number;
u32 alet;
u32 buffer;
} __attribute__ ((packed, aligned(8)));
struct dasd_diag_init_io {
u16 dev_nr;
u16 spare1[11];
u8 flaga;
u8 spare1[21];
u32 block_size;
u32 offset;
u32 start_block;
u32 end_block;
u32 spare2[6];
blocknum_t offset;
sblocknum_t start_block;
blocknum_t end_block;
u8 spare2[24];
} __attribute__ ((packed, aligned(8)));
struct dasd_diag_rw_io {
u16 dev_nr;
u16 spare1[11];
u8 flaga;
u8 spare1[21];
u8 key;
u8 flags;
u16 spare2;
u8 spare2[2];
u32 block_count;
u32 alet;
u32 bio_list;
u32 interrupt_params;
u32 spare3[5];
u8 spare3[20];
} __attribute__ ((packed, aligned(8)));
#endif /* CONFIG_ARCH_S390X */