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linux/drivers/s390/block/dasd_diag.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

542 lines
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/*
* File...........: linux/drivers/s390/block/dasd_diag.c
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Based on.......: linux/drivers/s390/block/mdisk.c
* ...............: by Hartmunt Penner <hpenner@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
* $Revision: 1.42 $
*/
#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hdreg.h> /* HDIO_GETGEO */
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/init.h>
#include <asm/dasd.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/s390_ext.h>
#include <asm/todclk.h>
#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");
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;
};
struct dasd_diag_req {
int block_count;
struct dasd_diag_bio bio[0];
};
static __inline__ int
dia250(void *iob, int cmd)
{
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"
#else
".section __ex_table,\"a\"\n"
" .align 8\n"
" .quad 0b,1b\n"
".previous\n"
#endif
: "=&d" (rc)
: "d" (cmd), "d" ((void *) __pa(iob))
: "0", "1", "cc");
return rc;
}
static __inline__ int
mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size)
{
struct dasd_diag_private *private;
struct dasd_diag_init_io *iib;
int rc;
private = (struct dasd_diag_private *) device->private;
iib = &private->iib;
memset(iib, 0, sizeof (struct dasd_diag_init_io));
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;
rc = dia250(iib, INIT_BIO);
return rc & 3;
}
static __inline__ int
mdsk_term_io(struct dasd_device * device)
{
struct dasd_diag_private *private;
struct dasd_diag_init_io *iib;
int rc;
private = (struct dasd_diag_private *) device->private;
iib = &private->iib;
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;
}
static int
dasd_start_diag(struct dasd_ccw_req * cqr)
{
struct dasd_device *device;
struct dasd_diag_private *private;
struct dasd_diag_req *dreq;
int rc;
device = cqr->device;
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.block_count = dreq->block_count;
private->iob.interrupt_params = (u32)(addr_t) cqr;
private->iob.bio_list = __pa(dreq->bio);
cqr->startclk = get_clock();
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) {
cqr->status = DASD_CQR_DONE;
dasd_schedule_bh(device);
} else {
cqr->status = DASD_CQR_IN_IO;
rc = 0;
}
return rc;
}
static void
dasd_ext_handler(struct pt_regs *regs, __u16 code)
{
struct dasd_ccw_req *cqr, *next;
struct dasd_device *device;
unsigned long long expires;
unsigned long flags;
char status;
int ip;
/*
* 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)
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;
device = (struct dasd_device *) cqr->device;
if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
DEV_MESSAGE(KERN_WARNING, device,
" magic number of dasd_ccw_req 0x%08X doesn't"
" match discipline 0x%08X",
cqr->magic, *(int *) (&device->discipline->name));
return;
}
/* get irq lock to modify request queue */
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
cqr->stopclk = get_clock();
expires = 0;
if (status == 0) {
cqr->status = DASD_CQR_DONE;
/* Start first request on queue if possible -> fast_io. */
if (!list_empty(&device->ccw_queue)) {
next = list_entry(device->ccw_queue.next,
struct dasd_ccw_req, list);
if (next->status == DASD_CQR_QUEUED) {
if (dasd_start_diag(next) == 0)
expires = next->expires;
else
DEV_MESSAGE(KERN_WARNING, device, "%s",
"Interrupt fastpath "
"failed!");
}
}
} else
cqr->status = DASD_CQR_FAILED;
if (expires != 0)
dasd_set_timer(device, expires);
else
dasd_clear_timer(device);
dasd_schedule_bh(device);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
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;
int rc;
private = (struct dasd_diag_private *) device->private;
if (private == NULL) {
private = kmalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
if (private == NULL) {
DEV_MESSAGE(KERN_WARNING, device, "%s",
"memory allocation failed for private data");
return -ENOMEM;
}
device->private = (void *) private;
}
/* Read Device Characteristics */
rdc_data = (void *) &(private->rdc_data);
rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev);
rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
rc = diag210((struct diag210 *) rdc_data);
if (rc)
return -ENOTSUPP;
/* Figure out position of label block */
switch (private->rdc_data.vdev_class) {
case DEV_CLASS_FBA:
private->pt_block = 1;
break;
case DEV_CLASS_ECKD:
private->pt_block = 2;
break;
default:
return -ENOTSUPP;
}
DBF_DEV_EVENT(DBF_INFO, device,
"%04X: %04X on real %04X/%02X",
rdc_data->dev_nr,
rdc_data->vdev_type,
rdc_data->rdev_type, rdc_data->rdev_model);
/* terminate all outstanding operations */
mdsk_term_io(device);
/* figure out blocksize of device */
label = (long *) get_zeroed_page(GFP_KERNEL);
if (label == NULL) {
DEV_MESSAGE(KERN_WARNING, device, "%s",
"No memory to allocate initialization request");
return -ENOMEM;
}
/* try all sizes - needed for ECKD devices */
for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
mdsk_init_io(device, bsize, 0, 64);
memset(&bio, 0, sizeof (struct dasd_diag_bio));
bio.type = MDSK_READ_REQ;
bio.block_number = private->pt_block + 1;
bio.buffer = __pa(label);
memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
private->iob.dev_nr = rdc_data->dev_nr;
private->iob.key = 0;
private->iob.flags = 0; /* do synchronous io */
private->iob.block_count = 1;
private->iob.interrupt_params = 0;
private->iob.bio_list = __pa(&bio);
if (dia250(&private->iob, RW_BIO) == 0)
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];
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);
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;
}
static int
dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
{
if (dasd_check_blocksize(device->bp_block) != 0)
return -EINVAL;
geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
geo->heads = 16;
geo->sectors = 128 >> device->s2b_shift;
return 0;
}
static dasd_era_t
dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat)
{
return dasd_era_fatal;
}
static dasd_erp_fn_t
dasd_diag_erp_action(struct dasd_ccw_req * cqr)
{
return dasd_default_erp_action;
}
static dasd_erp_fn_t
dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
{
return dasd_default_erp_postaction;
}
static struct dasd_ccw_req *
dasd_diag_build_cp(struct dasd_device * device, struct request *req)
{
struct dasd_ccw_req *cqr;
struct dasd_diag_req *dreq;
struct dasd_diag_bio *dbio;
struct bio *bio;
struct bio_vec *bv;
char *dst;
int count, datasize;
sector_t recid, first_rec, last_rec;
unsigned blksize, off;
unsigned char rw_cmd;
int i;
if (rq_data_dir(req) == READ)
rw_cmd = MDSK_READ_REQ;
else if (rq_data_dir(req) == WRITE)
rw_cmd = MDSK_WRITE_REQ;
else
return ERR_PTR(-EINVAL);
blksize = device->bp_block;
/* Calculate record id of first and last block. */
first_rec = req->sector >> device->s2b_shift;
last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
/* Check struct bio and count the number of blocks for the request. */
count = 0;
rq_for_each_bio(bio, req) {
bio_for_each_segment(bv, bio, i) {
if (bv->bv_len & (blksize - 1))
/* Fba can only do full blocks. */
return ERR_PTR(-EINVAL);
count += bv->bv_len >> (device->s2b_shift + 9);
}
}
/* Paranoia. */
if (count != last_rec - first_rec + 1)
return ERR_PTR(-EINVAL);
/* Build the request */
datasize = sizeof(struct dasd_diag_req) +
count*sizeof(struct dasd_diag_bio);
cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
datasize, device);
if (IS_ERR(cqr))
return cqr;
dreq = (struct dasd_diag_req *) cqr->data;
dreq->block_count = count;
dbio = dreq->bio;
recid = first_rec;
rq_for_each_bio(bio, req) {
bio_for_each_segment(bv, bio, i) {
dst = page_address(bv->bv_page) + bv->bv_offset;
for (off = 0; off < bv->bv_len; off += blksize) {
memset(dbio, 0, sizeof (struct dasd_diag_bio));
dbio->type = rw_cmd;
dbio->block_number = recid + 1;
dbio->buffer = __pa(dst);
dbio++;
dst += blksize;
recid++;
}
}
}
cqr->buildclk = get_clock();
cqr->device = device;
cqr->expires = 50 * HZ; /* 50 seconds */
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static int
dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
{
int status;
status = cqr->status == DASD_CQR_DONE;
dasd_sfree_request(cqr, cqr->device);
return status;
}
static int
dasd_diag_fill_info(struct dasd_device * device,
struct dasd_information2_t * info)
{
struct dasd_diag_private *private;
private = (struct dasd_diag_private *) device->private;
info->label_block = private->pt_block;
info->FBA_layout = 1;
info->format = DASD_FORMAT_LDL;
info->characteristics_size = sizeof (struct dasd_diag_characteristics);
memcpy(info->characteristics,
&((struct dasd_diag_private *) device->private)->rdc_data,
sizeof (struct dasd_diag_characteristics));
info->confdata_size = 0;
return 0;
}
static void
dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
struct irb *stat)
{
DEV_MESSAGE(KERN_ERR, device, "%s",
"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,
.check_device = dasd_diag_check_device,
.fill_geometry = dasd_diag_fill_geometry,
.start_IO = dasd_start_diag,
.examine_error = dasd_diag_examine_error,
.erp_action = dasd_diag_erp_action,
.erp_postaction = dasd_diag_erp_postaction,
.build_cp = dasd_diag_build_cp,
.free_cp = dasd_diag_free_cp,
.dump_sense = dasd_diag_dump_sense,
.fill_info = dasd_diag_fill_info,
};
static int __init
dasd_diag_init(void)
{
if (!MACHINE_IS_VM) {
MESSAGE_LOG(KERN_INFO,
"Machine is not VM: %s "
"discipline not initializing",
dasd_diag_discipline.name);
return -EINVAL;
}
ASCEBC(dasd_diag_discipline.ebcname, 4);
ctl_set_bit(0, 9);
register_external_interrupt(0x2603, dasd_ext_handler);
dasd_diag_discipline_pointer = &dasd_diag_discipline;
return 0;
}
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;
}
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:
*/
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