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linux/drivers/s390/block/dasd_fba.c

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/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* Copyright IBM Corp. 1999, 2009
*/
#define KMSG_COMPONENT "dasd-fba"
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <asm/debug.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/idals.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/ccwdev.h>
#include "dasd_int.h"
#include "dasd_fba.h"
#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif /* PRINTK_HEADER */
#define PRINTK_HEADER "dasd(fba):"
#define FBA_DEFAULT_RETRIES 32
#define DASD_FBA_CCW_WRITE 0x41
#define DASD_FBA_CCW_READ 0x42
#define DASD_FBA_CCW_LOCATE 0x43
#define DASD_FBA_CCW_DEFINE_EXTENT 0x63
MODULE_LICENSE("GPL");
static struct dasd_discipline dasd_fba_discipline;
struct dasd_fba_private {
struct dasd_fba_characteristics rdc_data;
};
static struct ccw_device_id dasd_fba_ids[] = {
{ CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
static struct ccw_driver dasd_fba_driver; /* see below */
static int
dasd_fba_probe(struct ccw_device *cdev)
{
return dasd_generic_probe(cdev, &dasd_fba_discipline);
}
static int
dasd_fba_set_online(struct ccw_device *cdev)
{
return dasd_generic_set_online(cdev, &dasd_fba_discipline);
}
static struct ccw_driver dasd_fba_driver = {
.driver = {
.name = "dasd-fba",
.owner = THIS_MODULE,
},
.ids = dasd_fba_ids,
.probe = dasd_fba_probe,
.remove = dasd_generic_remove,
.set_offline = dasd_generic_set_offline,
.set_online = dasd_fba_set_online,
.notify = dasd_generic_notify,
.path_event = dasd_generic_path_event,
.freeze = dasd_generic_pm_freeze,
.thaw = dasd_generic_restore_device,
.restore = dasd_generic_restore_device,
.int_class = IRQIO_DAS,
};
static void
define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
int blksize, int beg, int nr)
{
ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
ccw->flags = 0;
ccw->count = 16;
ccw->cda = (__u32) __pa(data);
memset(data, 0, sizeof (struct DE_fba_data));
if (rw == WRITE)
(data->mask).perm = 0x0;
else if (rw == READ)
(data->mask).perm = 0x1;
else
data->mask.perm = 0x2;
data->blk_size = blksize;
data->ext_loc = beg;
data->ext_end = nr - 1;
}
static void
locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
int block_nr, int block_ct)
{
ccw->cmd_code = DASD_FBA_CCW_LOCATE;
ccw->flags = 0;
ccw->count = 8;
ccw->cda = (__u32) __pa(data);
memset(data, 0, sizeof (struct LO_fba_data));
if (rw == WRITE)
data->operation.cmd = 0x5;
else if (rw == READ)
data->operation.cmd = 0x6;
else
data->operation.cmd = 0x8;
data->blk_nr = block_nr;
data->blk_ct = block_ct;
}
static int
dasd_fba_check_characteristics(struct dasd_device *device)
{
struct dasd_fba_private *private = device->private;
struct ccw_device *cdev = device->cdev;
struct dasd_block *block;
int readonly, rc;
if (!private) {
private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
if (!private) {
dev_warn(&device->cdev->dev,
"Allocating memory for private DASD "
"data failed\n");
return -ENOMEM;
}
device->private = private;
} else {
memset(private, 0, sizeof(*private));
}
block = dasd_alloc_block();
if (IS_ERR(block)) {
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
"dasd block structure");
device->private = NULL;
kfree(private);
return PTR_ERR(block);
}
device->block = block;
block->base = device;
/* Read Device Characteristics */
rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
&private->rdc_data, 32);
if (rc) {
DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
"characteristics returned error %d", rc);
device->block = NULL;
dasd_free_block(block);
device->private = NULL;
kfree(private);
return rc;
}
device->default_expires = DASD_EXPIRES;
device->default_retries = FBA_DEFAULT_RETRIES;
dasd_path_set_opm(device, LPM_ANYPATH);
readonly = dasd_device_is_ro(device);
if (readonly)
set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
/* FBA supports discard, set the according feature bit */
dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);
dev_info(&device->cdev->dev,
"New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
"and %d B/blk%s\n",
cdev->id.dev_type,
cdev->id.dev_model,
cdev->id.cu_type,
cdev->id.cu_model,
((private->rdc_data.blk_bdsa *
(private->rdc_data.blk_size >> 9)) >> 11),
private->rdc_data.blk_size,
readonly ? ", read-only device" : "");
return 0;
}
static int dasd_fba_do_analysis(struct dasd_block *block)
{
struct dasd_fba_private *private = block->base->private;
int sb, rc;
rc = dasd_check_blocksize(private->rdc_data.blk_size);
if (rc) {
DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
private->rdc_data.blk_size);
return rc;
}
block->blocks = private->rdc_data.blk_bdsa;
block->bp_block = private->rdc_data.blk_size;
block->s2b_shift = 0; /* bits to shift 512 to get a block */
for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
block->s2b_shift++;
return 0;
}
static int dasd_fba_fill_geometry(struct dasd_block *block,
struct hd_geometry *geo)
{
if (dasd_check_blocksize(block->bp_block) != 0)
return -EINVAL;
geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
geo->heads = 16;
geo->sectors = 128 >> block->s2b_shift;
return 0;
}
static dasd_erp_fn_t
dasd_fba_erp_action(struct dasd_ccw_req * cqr)
{
return dasd_default_erp_action;
}
static dasd_erp_fn_t
dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
{
if (cqr->function == dasd_default_erp_action)
return dasd_default_erp_postaction;
DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
cqr->function);
return NULL;
}
static void dasd_fba_check_for_device_change(struct dasd_device *device,
struct dasd_ccw_req *cqr,
struct irb *irb)
{
char mask;
/* first of all check for state change pending interrupt */
mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
if ((irb->scsw.cmd.dstat & mask) == mask)
dasd_generic_handle_state_change(device);
};
/*
* Builds a CCW with no data payload
*/
static void ccw_write_no_data(struct ccw1 *ccw)
{
ccw->cmd_code = DASD_FBA_CCW_WRITE;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = 0;
}
/*
* Builds a CCW that writes only zeroes.
*/
static void ccw_write_zero(struct ccw1 *ccw, int count)
{
ccw->cmd_code = DASD_FBA_CCW_WRITE;
ccw->flags |= CCW_FLAG_SLI;
ccw->count = count;
ccw->cda = (__u32) (addr_t) page_to_phys(ZERO_PAGE(0));
}
/*
* Helper function to count the amount of necessary CCWs within a given range
* with 4k alignment and command chaining in mind.
*/
static int count_ccws(sector_t first_rec, sector_t last_rec,
unsigned int blocks_per_page)
{
sector_t wz_stop = 0, d_stop = 0;
int cur_pos = 0;
int count = 0;
if (first_rec % blocks_per_page != 0) {
wz_stop = first_rec + blocks_per_page -
(first_rec % blocks_per_page) - 1;
if (wz_stop > last_rec)
wz_stop = last_rec;
cur_pos = wz_stop - first_rec + 1;
count++;
}
if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
blocks_per_page);
else
d_stop = last_rec;
cur_pos += d_stop - (first_rec + cur_pos) + 1;
count++;
}
if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec)
count++;
return count;
}
/*
* This function builds a CCW request for block layer discard requests.
* Each page in the z/VM hypervisor that represents certain records of an FBA
* device will be padded with zeros. This is a special behaviour of the WRITE
* command which is triggered when no data payload is added to the CCW.
*
* Note: Due to issues in some z/VM versions, we can't fully utilise this
* special behaviour. We have to keep a 4k (or 8 block) alignment in mind to
* work around those issues and write actual zeroes to the unaligned parts in
* the request. This workaround might be removed in the future.
*/
static struct dasd_ccw_req *dasd_fba_build_cp_discard(
struct dasd_device *memdev,
struct dasd_block *block,
struct request *req)
{
struct LO_fba_data *LO_data;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
sector_t wz_stop = 0, d_stop = 0;
sector_t first_rec, last_rec;
unsigned int blksize = block->bp_block;
unsigned int blocks_per_page;
int wz_count = 0;
int d_count = 0;
int cur_pos = 0; /* Current position within the extent */
int count = 0;
int cplength;
int datasize;
int nr_ccws;
first_rec = blk_rq_pos(req) >> block->s2b_shift;
last_rec =
(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
count = last_rec - first_rec + 1;
blocks_per_page = BLOCKS_PER_PAGE(blksize);
nr_ccws = count_ccws(first_rec, last_rec, blocks_per_page);
/* define extent + nr_ccws * locate record + nr_ccws * single CCW */
cplength = 1 + 2 * nr_ccws;
datasize = sizeof(struct DE_fba_data) +
nr_ccws * (sizeof(struct LO_fba_data) + sizeof(struct ccw1));
cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
define_extent(ccw++, cqr->data, WRITE, blksize, first_rec, count);
LO_data = cqr->data + sizeof(struct DE_fba_data);
/* First part is not aligned. Calculate range to write zeroes. */
if (first_rec % blocks_per_page != 0) {
wz_stop = first_rec + blocks_per_page -
(first_rec % blocks_per_page) - 1;
if (wz_stop > last_rec)
wz_stop = last_rec;
wz_count = wz_stop - first_rec + 1;
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
ccw[-1].flags |= CCW_FLAG_CC;
ccw_write_zero(ccw++, wz_count * blksize);
cur_pos = wz_count;
}
/* We can do proper discard when we've got at least blocks_per_page blocks. */
if (last_rec - (first_rec + cur_pos) + 1 >= blocks_per_page) {
/* is last record at page boundary? */
if ((last_rec - blocks_per_page + 1) % blocks_per_page != 0)
d_stop = last_rec - ((last_rec - blocks_per_page + 1) %
blocks_per_page);
else
d_stop = last_rec;
d_count = d_stop - (first_rec + cur_pos) + 1;
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, WRITE, cur_pos, d_count);
ccw[-1].flags |= CCW_FLAG_CC;
ccw_write_no_data(ccw++);
cur_pos += d_count;
}
/* We might still have some bits left which need to be zeroed. */
if (cur_pos == 0 || first_rec + cur_pos - 1 < last_rec) {
if (d_stop != 0)
wz_count = last_rec - d_stop;
else if (wz_stop != 0)
wz_count = last_rec - wz_stop;
else
wz_count = count;
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, WRITE, cur_pos, wz_count);
ccw[-1].flags |= CCW_FLAG_CC;
ccw_write_zero(ccw++, wz_count * blksize);
}
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->startdev = memdev;
cqr->memdev = memdev;
cqr->block = block;
cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
cqr->retries = memdev->default_retries;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static struct dasd_ccw_req *dasd_fba_build_cp_regular(
struct dasd_device *memdev,
struct dasd_block *block,
struct request *req)
{
struct dasd_fba_private *private = block->base->private;
unsigned long *idaws;
struct LO_fba_data *LO_data;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
struct req_iterator iter;
struct bio_vec bv;
char *dst;
int count, cidaw, cplength, datasize;
sector_t recid, first_rec, last_rec;
unsigned int blksize, off;
unsigned char cmd;
if (rq_data_dir(req) == READ) {
cmd = DASD_FBA_CCW_READ;
} else if (rq_data_dir(req) == WRITE) {
cmd = DASD_FBA_CCW_WRITE;
} else
return ERR_PTR(-EINVAL);
blksize = block->bp_block;
/* Calculate record id of first and last block. */
first_rec = blk_rq_pos(req) >> block->s2b_shift;
last_rec =
(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
/* Check struct bio and count the number of blocks for the request. */
count = 0;
cidaw = 0;
rq_for_each_segment(bv, req, iter) {
if (bv.bv_len & (blksize - 1))
/* Fba can only do full blocks. */
return ERR_PTR(-EINVAL);
count += bv.bv_len >> (block->s2b_shift + 9);
if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
cidaw += bv.bv_len / blksize;
}
/* Paranoia. */
if (count != last_rec - first_rec + 1)
return ERR_PTR(-EINVAL);
/* 1x define extent + 1x locate record + number of blocks */
cplength = 2 + count;
/* 1x define extent + 1x locate record */
datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
cidaw * sizeof(unsigned long);
/*
* Find out number of additional locate record ccws if the device
* can't do data chaining.
*/
if (private->rdc_data.mode.bits.data_chain == 0) {
cplength += count - 1;
datasize += (count - 1)*sizeof(struct LO_fba_data);
}
/* Allocate the ccw request. */
cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
/* First ccw is define extent. */
define_extent(ccw++, cqr->data, rq_data_dir(req),
block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
/* Build locate_record + read/write ccws. */
idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
LO_data = (struct LO_fba_data *) (idaws + cidaw);
/* Locate record for all blocks for smart devices. */
if (private->rdc_data.mode.bits.data_chain != 0) {
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
}
recid = first_rec;
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
if (dasd_page_cache) {
char *copy = kmem_cache_alloc(dasd_page_cache,
GFP_DMA | __GFP_NOWARN);
if (copy && rq_data_dir(req) == WRITE)
memcpy(copy + bv.bv_offset, dst, bv.bv_len);
if (copy)
dst = copy + bv.bv_offset;
}
for (off = 0; off < bv.bv_len; off += blksize) {
/* Locate record for stupid devices. */
if (private->rdc_data.mode.bits.data_chain == 0) {
ccw[-1].flags |= CCW_FLAG_CC;
locate_record(ccw, LO_data++,
rq_data_dir(req),
recid - first_rec, 1);
ccw->flags = CCW_FLAG_CC;
ccw++;
} else {
if (recid > first_rec)
ccw[-1].flags |= CCW_FLAG_DC;
else
ccw[-1].flags |= CCW_FLAG_CC;
}
ccw->cmd_code = cmd;
ccw->count = block->bp_block;
if (idal_is_needed(dst, blksize)) {
ccw->cda = (__u32)(addr_t) idaws;
ccw->flags = CCW_FLAG_IDA;
idaws = idal_create_words(idaws, dst, blksize);
} else {
ccw->cda = (__u32)(addr_t) dst;
ccw->flags = 0;
}
ccw++;
dst += blksize;
recid++;
}
}
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->startdev = memdev;
cqr->memdev = memdev;
cqr->block = block;
cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
cqr->retries = memdev->default_retries;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device *memdev,
struct dasd_block *block,
struct request *req)
{
if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_ZEROES)
return dasd_fba_build_cp_discard(memdev, block, req);
else
return dasd_fba_build_cp_regular(memdev, block, req);
}
static int
dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
{
struct dasd_fba_private *private = cqr->block->base->private;
struct ccw1 *ccw;
struct req_iterator iter;
struct bio_vec bv;
char *dst, *cda;
unsigned int blksize, off;
int status;
if (!dasd_page_cache)
goto out;
blksize = cqr->block->bp_block;
ccw = cqr->cpaddr;
/* Skip over define extent & locate record. */
ccw++;
if (private->rdc_data.mode.bits.data_chain != 0)
ccw++;
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv.bv_page) + bv.bv_offset;
for (off = 0; off < bv.bv_len; off += blksize) {
/* Skip locate record. */
if (private->rdc_data.mode.bits.data_chain == 0)
ccw++;
if (dst) {
if (ccw->flags & CCW_FLAG_IDA)
cda = *((char **)((addr_t) ccw->cda));
else
cda = (char *)((addr_t) ccw->cda);
if (dst != cda) {
if (rq_data_dir(req) == READ)
memcpy(dst, cda, bv.bv_len);
kmem_cache_free(dasd_page_cache,
(void *)((addr_t)cda & PAGE_MASK));
}
dst = NULL;
}
ccw++;
}
}
out:
status = cqr->status == DASD_CQR_DONE;
dasd_sfree_request(cqr, cqr->memdev);
return status;
}
static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
{
if (cqr->retries < 0)
cqr->status = DASD_CQR_FAILED;
else
cqr->status = DASD_CQR_FILLED;
};
static int
dasd_fba_fill_info(struct dasd_device * device,
struct dasd_information2_t * info)
{
struct dasd_fba_private *private = device->private;
info->label_block = 1;
info->FBA_layout = 1;
info->format = DASD_FORMAT_LDL;
info->characteristics_size = sizeof(private->rdc_data);
memcpy(info->characteristics, &private->rdc_data,
sizeof(private->rdc_data));
info->confdata_size = 0;
return 0;
}
static void
dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
char *reason)
{
u64 *sense;
sense = (u64 *) dasd_get_sense(irb);
if (sense) {
DBF_DEV_EVENT(DBF_EMERG, device,
"%s: %s %02x%02x%02x %016llx %016llx %016llx "
"%016llx", reason,
scsw_is_tm(&irb->scsw) ? "t" : "c",
scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
scsw_dstat(&irb->scsw), sense[0], sense[1],
sense[2], sense[3]);
} else {
DBF_DEV_EVENT(DBF_EMERG, device, "%s",
"SORRY - NO VALID SENSE AVAILABLE\n");
}
}
static void
dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
struct irb *irb)
{
char *page;
struct ccw1 *act, *end, *last;
int len, sl, sct, count;
page = (char *) get_zeroed_page(GFP_ATOMIC);
if (page == NULL) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"No memory to dump sense data");
return;
}
len = sprintf(page, PRINTK_HEADER
" I/O status report for device %s:\n",
dev_name(&device->cdev->dev));
len += sprintf(page + len, PRINTK_HEADER
" in req: %p CS: 0x%02X DS: 0x%02X\n", req,
irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
len += sprintf(page + len, PRINTK_HEADER
" device %s: Failing CCW: %p\n",
dev_name(&device->cdev->dev),
(void *) (addr_t) irb->scsw.cmd.cpa);
if (irb->esw.esw0.erw.cons) {
for (sl = 0; sl < 4; sl++) {
len += sprintf(page + len, PRINTK_HEADER
" Sense(hex) %2d-%2d:",
(8 * sl), ((8 * sl) + 7));
for (sct = 0; sct < 8; sct++) {
len += sprintf(page + len, " %02x",
irb->ecw[8 * sl + sct]);
}
len += sprintf(page + len, "\n");
}
} else {
len += sprintf(page + len, PRINTK_HEADER
" SORRY - NO VALID SENSE AVAILABLE\n");
}
printk(KERN_ERR "%s", page);
/* dump the Channel Program */
/* print first CCWs (maximum 8) */
act = req->cpaddr;
for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
end = min(act + 8, last);
len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
while (act <= end) {
len += sprintf(page + len, PRINTK_HEADER
" CCW %p: %08X %08X DAT:",
act, ((int *) act)[0], ((int *) act)[1]);
for (count = 0; count < 32 && count < act->count;
count += sizeof(int))
len += sprintf(page + len, " %08X",
((int *) (addr_t) act->cda)
[(count>>2)]);
len += sprintf(page + len, "\n");
act++;
}
printk(KERN_ERR "%s", page);
/* print failing CCW area */
len = 0;
if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
len += sprintf(page + len, PRINTK_HEADER "......\n");
}
end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
while (act <= end) {
len += sprintf(page + len, PRINTK_HEADER
" CCW %p: %08X %08X DAT:",
act, ((int *) act)[0], ((int *) act)[1]);
for (count = 0; count < 32 && count < act->count;
count += sizeof(int))
len += sprintf(page + len, " %08X",
((int *) (addr_t) act->cda)
[(count>>2)]);
len += sprintf(page + len, "\n");
act++;
}
/* print last CCWs */
if (act < last - 2) {
act = last - 2;
len += sprintf(page + len, PRINTK_HEADER "......\n");
}
while (act <= last) {
len += sprintf(page + len, PRINTK_HEADER
" CCW %p: %08X %08X DAT:",
act, ((int *) act)[0], ((int *) act)[1]);
for (count = 0; count < 32 && count < act->count;
count += sizeof(int))
len += sprintf(page + len, " %08X",
((int *) (addr_t) act->cda)
[(count>>2)]);
len += sprintf(page + len, "\n");
act++;
}
if (len > 0)
printk(KERN_ERR "%s", page);
free_page((unsigned long) page);
}
/*
* 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). For 64 bit one dasd_mchunkt_t structure has
* 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
* up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
* addition we have one define extent ccw + 16 bytes of data and a
* locate record ccw for each block (stupid devices!) + 16 bytes of data.
* That makes:
* (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 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 100.1 blocks
* for one request. Give a little safety and the result is 96.
*/
static struct dasd_discipline dasd_fba_discipline = {
.owner = THIS_MODULE,
.name = "FBA ",
.ebcname = "FBA ",
.max_blocks = 96,
.check_device = dasd_fba_check_characteristics,
.do_analysis = dasd_fba_do_analysis,
.verify_path = dasd_generic_verify_path,
.fill_geometry = dasd_fba_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
.handle_terminated_request = dasd_fba_handle_terminated_request,
.erp_action = dasd_fba_erp_action,
.erp_postaction = dasd_fba_erp_postaction,
.check_for_device_change = dasd_fba_check_for_device_change,
.build_cp = dasd_fba_build_cp,
.free_cp = dasd_fba_free_cp,
.dump_sense = dasd_fba_dump_sense,
.dump_sense_dbf = dasd_fba_dump_sense_dbf,
.fill_info = dasd_fba_fill_info,
};
static int __init
dasd_fba_init(void)
{
int ret;
ASCEBC(dasd_fba_discipline.ebcname, 4);
ret = ccw_driver_register(&dasd_fba_driver);
if (!ret)
wait_for_device_probe();
return ret;
}
static void __exit
dasd_fba_cleanup(void)
{
ccw_driver_unregister(&dasd_fba_driver);
}
module_init(dasd_fba_init);
module_exit(dasd_fba_cleanup);
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