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acrn-kernel/drivers/s390/block/dasd_fba.c

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/*
* File...........: linux/drivers/s390/block/dasd_fba.c
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
*/
#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/todclk.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 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 = {
.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,
};
static inline 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 inline 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;
struct ccw_device *cdev = device->cdev;
void *rdc_data;
int rc;
private = (struct dasd_fba_private *) device->private;
if (private == NULL) {
private = kzalloc(sizeof(struct dasd_fba_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);
rc = read_dev_chars(device->cdev, &rdc_data, 32);
if (rc) {
DEV_MESSAGE(KERN_WARNING, device,
"Read device characteristics returned error %d",
rc);
return rc;
}
DEV_MESSAGE(KERN_INFO, device,
"%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
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);
return 0;
}
static int
dasd_fba_do_analysis(struct dasd_device *device)
{
struct dasd_fba_private *private;
int sb, rc;
private = (struct dasd_fba_private *) device->private;
rc = dasd_check_blocksize(private->rdc_data.blk_size);
if (rc) {
DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
private->rdc_data.blk_size);
return rc;
}
device->blocks = private->rdc_data.blk_bdsa;
device->bp_block = private->rdc_data.blk_size;
device->s2b_shift = 0; /* bits to shift 512 to get a block */
for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
device->s2b_shift++;
return 0;
}
static int
dasd_fba_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_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
{
struct dasd_device *device;
struct ccw_device *cdev;
device = (struct dasd_device *) cqr->device;
if (irb->scsw.cstat == 0x00 &&
irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
return dasd_era_none;
cdev = device->cdev;
switch (cdev->id.dev_type) {
case 0x3370:
return dasd_3370_erp_examine(cqr, irb);
case 0x9336:
return dasd_9336_erp_examine(cqr, irb);
default:
return dasd_era_recover;
}
}
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;
DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
cqr->function);
return NULL;
}
static struct dasd_ccw_req *
dasd_fba_build_cp(struct dasd_device * device, struct request *req)
{
struct dasd_fba_private *private;
unsigned long *idaws;
struct LO_fba_data *LO_data;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
struct bio *bio;
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;
int i;
private = (struct dasd_fba_private *) device->private;
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 = 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;
cidaw = 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);
#if defined(CONFIG_64BIT)
if (idal_is_needed (page_address(bv->bv_page),
bv->bv_len))
cidaw += bv->bv_len / blksize;
#endif
}
}
/* 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_discipline.name,
cplength, datasize, device);
if (IS_ERR(cqr))
return cqr;
ccw = cqr->cpaddr;
/* First ccw is define extent. */
define_extent(ccw++, cqr->data, rq_data_dir(req),
device->bp_block, req->sector, req->nr_sectors);
/* 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_bio(bio, req) bio_for_each_segment(bv, bio, i) {
dst = page_address(bv->bv_page) + bv->bv_offset;
if (dasd_page_cache) {
char *copy = kmem_cache_alloc(dasd_page_cache,
SLAB_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 = device->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 (req->flags & REQ_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
cqr->device = device;
cqr->expires = 5 * 60 * HZ; /* 5 minutes */
cqr->retries = 32;
cqr->buildclk = get_clock();
cqr->status = DASD_CQR_FILLED;
return cqr;
}
static int
dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
{
struct dasd_fba_private *private;
struct ccw1 *ccw;
struct bio *bio;
struct bio_vec *bv;
char *dst, *cda;
unsigned int blksize, off;
int i, status;
if (!dasd_page_cache)
goto out;
private = (struct dasd_fba_private *) cqr->device->private;
blksize = cqr->device->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_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) {
/* 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->device);
return status;
}
static int
dasd_fba_fill_info(struct dasd_device * device,
struct dasd_information2_t * info)
{
info->label_block = 1;
info->FBA_layout = 1;
info->format = DASD_FORMAT_LDL;
info->characteristics_size = sizeof(struct dasd_fba_characteristics);
memcpy(info->characteristics,
&((struct dasd_fba_private *) device->private)->rdc_data,
sizeof (struct dasd_fba_characteristics));
info->confdata_size = 0;
return 0;
}
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) {
DEV_MESSAGE(KERN_ERR, device, " %s",
"No memory to dump sense data");
return;
}
len = sprintf(page, KERN_ERR PRINTK_HEADER
" I/O status report for device %s:\n",
device->cdev->dev.bus_id);
len += sprintf(page + len, KERN_ERR PRINTK_HEADER
" in req: %p CS: 0x%02X DS: 0x%02X\n", req,
irb->scsw.cstat, irb->scsw.dstat);
len += sprintf(page + len, KERN_ERR PRINTK_HEADER
" device %s: Failing CCW: %p\n",
device->cdev->dev.bus_id,
(void *) (addr_t) irb->scsw.cpa);
if (irb->esw.esw0.erw.cons) {
for (sl = 0; sl < 4; sl++) {
len += sprintf(page + len, KERN_ERR 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, KERN_ERR PRINTK_HEADER
" SORRY - NO VALID SENSE AVAILABLE\n");
}
MESSAGE_LOG(KERN_ERR, "%s",
page + sizeof(KERN_ERR PRINTK_HEADER));
/* 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, KERN_ERR PRINTK_HEADER
" Related CP in req: %p\n", req);
while (act <= end) {
len += sprintf(page + len, KERN_ERR 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++;
}
MESSAGE_LOG(KERN_ERR, "%s",
page + sizeof(KERN_ERR PRINTK_HEADER));
/* print failing CCW area */
len = 0;
if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
}
end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
while (act <= end) {
len += sprintf(page + len, KERN_ERR 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, KERN_ERR PRINTK_HEADER "......\n");
}
while (act <= last) {
len += sprintf(page + len, KERN_ERR 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)
MESSAGE_LOG(KERN_ERR, "%s",
page + sizeof(KERN_ERR PRINTK_HEADER));
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,
.fill_geometry = dasd_fba_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
.examine_error = dasd_fba_examine_error,
.erp_action = dasd_fba_erp_action,
.erp_postaction = dasd_fba_erp_postaction,
.build_cp = dasd_fba_build_cp,
.free_cp = dasd_fba_free_cp,
.dump_sense = dasd_fba_dump_sense,
.fill_info = dasd_fba_fill_info,
};
static int __init
dasd_fba_init(void)
{
ASCEBC(dasd_fba_discipline.ebcname, 4);
return ccw_driver_register(&dasd_fba_driver);
}
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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