[deliverable/linux.git] / drivers / s390 / block / dasd_fba.c

/*
 * 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 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_block *block;
	struct dasd_fba_private *private;
	struct ccw_device *cdev = device->cdev;
	int rc;
	int readonly;

	private = (struct dasd_fba_private *) device->private;
	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 = (void *) 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->path_data.opm = LPM_ANYPATH;

	readonly = dasd_device_is_ro(device);
	if (readonly)
		set_bit(DASD_FLAG_DEVICE_RO, &device->flags);

	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;
	int sb, rc;

	private = (struct dasd_fba_private *) block->base->private;
	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);
};

static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
					      struct dasd_block *block,
					      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 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;

	private = (struct dasd_fba_private *) block->base->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 = 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 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_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 = 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 req_iterator iter;
	struct bio_vec *bv;
	char *dst, *cda;
	unsigned int blksize, off;
	int status;

	if (!dasd_page_cache)
		goto out;
	private = (struct dasd_fba_private *) cqr->block->base->private;
	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)
{
	cqr->status = DASD_CQR_FILLED;
};

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_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);
Commit	Line	Data
138c014d	1	/*
1da177e4 LT	2	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
1da177e4 LT	3	* Bugreports.to..: <Linux390@de.ibm.com>
d41dd122	4	* Copyright IBM Corp. 1999, 2009
1da177e4 LT	5	*/
1da177e4 LT	6
ca99dab0	7	#define KMSG_COMPONENT "dasd-fba"
fc19f381	8
1da177e4 LT	9	#include <linux/stddef.h>
	10	#include <linux/kernel.h>
	11	#include <asm/debug.h>
	12
	13	#include <linux/slab.h>
	14	#include <linux/hdreg.h> /* HDIO_GETGEO */
	15	#include <linux/bio.h>
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18
	19	#include <asm/idals.h>
	20	#include <asm/ebcdic.h>
	21	#include <asm/io.h>
1da177e4 LT	22	#include <asm/ccwdev.h>
	23
	24	#include "dasd_int.h"
	25	#include "dasd_fba.h"
	26
	27	#ifdef PRINTK_HEADER
	28	#undef PRINTK_HEADER
	29	#endif /* PRINTK_HEADER */
	30	#define PRINTK_HEADER "dasd(fba):"
	31
	32	#define DASD_FBA_CCW_WRITE 0x41
	33	#define DASD_FBA_CCW_READ 0x42
	34	#define DASD_FBA_CCW_LOCATE 0x43
	35	#define DASD_FBA_CCW_DEFINE_EXTENT 0x63
	36
	37	MODULE_LICENSE("GPL");
	38
	39	static struct dasd_discipline dasd_fba_discipline;
	40
	41	struct dasd_fba_private {
	42	struct dasd_fba_characteristics rdc_data;
	43	};
	44
	45	static struct ccw_device_id dasd_fba_ids[] = {
d2c993d8 HC	46	{ CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
d2c993d8 HC	47	{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
1da177e4 LT	48	{ /* end of list */ },
	49	};
	50
	51	MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
	52
	53	static struct ccw_driver dasd_fba_driver; /* see below */
	54	static int
	55	dasd_fba_probe(struct ccw_device *cdev)
	56	{
40545573	57	return dasd_generic_probe(cdev, &dasd_fba_discipline);
1da177e4 LT	58	}
	59
	60	static int
	61	dasd_fba_set_online(struct ccw_device *cdev)
	62	{
40545573	63	return dasd_generic_set_online(cdev, &dasd_fba_discipline);
1da177e4 LT	64	}
	65
	66	static struct ccw_driver dasd_fba_driver = {
3bda058b SO	67	.driver = {
	68	.name = "dasd-fba",
	69	.owner = THIS_MODULE,
	70	},
1da177e4 LT	71	.ids = dasd_fba_ids,
	72	.probe = dasd_fba_probe,
	73	.remove = dasd_generic_remove,
	74	.set_offline = dasd_generic_set_offline,
	75	.set_online = dasd_fba_set_online,
	76	.notify = dasd_generic_notify,
a4d26c6a	77	.path_event = dasd_generic_path_event,
d41dd122 SH	78	.freeze = dasd_generic_pm_freeze,
	79	.thaw = dasd_generic_restore_device,
	80	.restore = dasd_generic_restore_device,
420f42ec	81	.int_class = IRQIO_DAS,
1da177e4 LT	82	};
1da177e4 LT	83
4d284cac	84	static void
1da177e4 LT	85	define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
	86	int blksize, int beg, int nr)
	87	{
	88	ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
	89	ccw->flags = 0;
	90	ccw->count = 16;
	91	ccw->cda = (__u32) __pa(data);
	92	memset(data, 0, sizeof (struct DE_fba_data));
	93	if (rw == WRITE)
	94	(data->mask).perm = 0x0;
	95	else if (rw == READ)
	96	(data->mask).perm = 0x1;
	97	else
	98	data->mask.perm = 0x2;
	99	data->blk_size = blksize;
	100	data->ext_loc = beg;
	101	data->ext_end = nr - 1;
	102	}
	103
4d284cac	104	static void
1da177e4 LT	105	locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
	106	int block_nr, int block_ct)
	107	{
	108	ccw->cmd_code = DASD_FBA_CCW_LOCATE;
	109	ccw->flags = 0;
	110	ccw->count = 8;
	111	ccw->cda = (__u32) __pa(data);
	112	memset(data, 0, sizeof (struct LO_fba_data));
	113	if (rw == WRITE)
	114	data->operation.cmd = 0x5;
	115	else if (rw == READ)
	116	data->operation.cmd = 0x6;
	117	else
	118	data->operation.cmd = 0x8;
	119	data->blk_nr = block_nr;
	120	data->blk_ct = block_ct;
	121	}
	122
	123	static int
	124	dasd_fba_check_characteristics(struct dasd_device *device)
	125	{
8e09f215	126	struct dasd_block *block;
1da177e4	127	struct dasd_fba_private *private;
138c014d	128	struct ccw_device *cdev = device->cdev;
1da177e4	129	int rc;
33b62a30	130	int readonly;
1da177e4 LT	131
1da177e4 LT	132	private = (struct dasd_fba_private *) device->private;
92636b15 SO	133	if (!private) {
	134	private = kzalloc(sizeof(*private), GFP_KERNEL \| GFP_DMA);
	135	if (!private) {
fc19f381 SH	136	dev_warn(&device->cdev->dev,
	137	"Allocating memory for private DASD "
	138	"data failed\n");
1da177e4 LT	139	return -ENOMEM;
	140	}
	141	device->private = (void *) private;
92636b15 SO	142	} else {
92636b15 SO	143	memset(private, 0, sizeof(*private));
1da177e4	144	}
8e09f215 SW	145	block = dasd_alloc_block();
8e09f215 SW	146	if (IS_ERR(block)) {
b8ed5dd5 SH	147	DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
b8ed5dd5 SH	148	"dasd block structure");
7337194f CH	149	device->private = NULL;
7337194f CH	150	kfree(private);
8e09f215 SW	151	return PTR_ERR(block);
	152	}
	153	device->block = block;
	154	block->base = device;
	155
1da177e4	156	/* Read Device Characteristics */
68b781fe SH	157	rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
68b781fe SH	158	&private->rdc_data, 32);
1da177e4	159	if (rc) {
b8ed5dd5 SH	160	DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
b8ed5dd5 SH	161	"characteristics returned error %d", rc);
7337194f CH	162	device->block = NULL;
	163	dasd_free_block(block);
	164	device->private = NULL;
	165	kfree(private);
1da177e4 LT	166	return rc;
	167	}
	168
7c8faa86	169	device->default_expires = DASD_EXPIRES;
a4d26c6a	170	device->path_data.opm = LPM_ANYPATH;
7c8faa86	171
33b62a30 SW	172	readonly = dasd_device_is_ro(device);
	173	if (readonly)
	174	set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
	175
fc19f381 SH	176	dev_info(&device->cdev->dev,
fc19f381 SH	177	"New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
33b62a30	178	"and %d B/blk%s\n",
fc19f381 SH	179	cdev->id.dev_type,
	180	cdev->id.dev_model,
	181	cdev->id.cu_type,
	182	cdev->id.cu_model,
	183	((private->rdc_data.blk_bdsa *
	184	(private->rdc_data.blk_size >> 9)) >> 11),
33b62a30 SW	185	private->rdc_data.blk_size,
33b62a30 SW	186	readonly ? ", read-only device" : "");
1da177e4 LT	187	return 0;
	188	}
	189
8e09f215	190	static int dasd_fba_do_analysis(struct dasd_block *block)
1da177e4 LT	191	{
	192	struct dasd_fba_private *private;
	193	int sb, rc;
	194
8e09f215	195	private = (struct dasd_fba_private *) block->base->private;
1da177e4 LT	196	rc = dasd_check_blocksize(private->rdc_data.blk_size);
1da177e4 LT	197	if (rc) {
fc19f381	198	DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
1da177e4 LT	199	private->rdc_data.blk_size);
	200	return rc;
	201	}
8e09f215 SW	202	block->blocks = private->rdc_data.blk_bdsa;
	203	block->bp_block = private->rdc_data.blk_size;
	204	block->s2b_shift = 0; /* bits to shift 512 to get a block */
1da177e4	205	for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
8e09f215	206	block->s2b_shift++;
1da177e4 LT	207	return 0;
	208	}
	209
8e09f215 SW	210	static int dasd_fba_fill_geometry(struct dasd_block *block,
8e09f215 SW	211	struct hd_geometry *geo)
1da177e4	212	{
8e09f215	213	if (dasd_check_blocksize(block->bp_block) != 0)
1da177e4	214	return -EINVAL;
8e09f215	215	geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
1da177e4	216	geo->heads = 16;
8e09f215	217	geo->sectors = 128 >> block->s2b_shift;
1da177e4 LT	218	return 0;
	219	}
	220
1da177e4 LT	221	static dasd_erp_fn_t
	222	dasd_fba_erp_action(struct dasd_ccw_req * cqr)
	223	{
	224	return dasd_default_erp_action;
	225	}
	226
	227	static dasd_erp_fn_t
	228	dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
	229	{
	230	if (cqr->function == dasd_default_erp_action)
	231	return dasd_default_erp_postaction;
	232
fc19f381	233	DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
1da177e4 LT	234	cqr->function);
	235	return NULL;
	236	}
	237
5a27e60d SW	238	static void dasd_fba_check_for_device_change(struct dasd_device *device,
	239	struct dasd_ccw_req *cqr,
	240	struct irb *irb)
8e09f215 SW	241	{
	242	char mask;
	243
	244	/* first of all check for state change pending interrupt */
	245	mask = DEV_STAT_ATTENTION \| DEV_STAT_DEV_END \| DEV_STAT_UNIT_EXCEP;
5a27e60d	246	if ((irb->scsw.cmd.dstat & mask) == mask)
8e09f215	247	dasd_generic_handle_state_change(device);
8e09f215 SW	248	};
	249
	250	static struct dasd_ccw_req dasd_fba_build_cp(struct dasd_device memdev,
	251	struct dasd_block *block,
	252	struct request *req)
1da177e4 LT	253	{
	254	struct dasd_fba_private *private;
	255	unsigned long *idaws;
	256	struct LO_fba_data *LO_data;
	257	struct dasd_ccw_req *cqr;
	258	struct ccw1 *ccw;
5705f702	259	struct req_iterator iter;
1da177e4 LT	260	struct bio_vec *bv;
	261	char *dst;
	262	int count, cidaw, cplength, datasize;
	263	sector_t recid, first_rec, last_rec;
	264	unsigned int blksize, off;
	265	unsigned char cmd;
1da177e4	266
8e09f215	267	private = (struct dasd_fba_private *) block->base->private;
1da177e4 LT	268	if (rq_data_dir(req) == READ) {
	269	cmd = DASD_FBA_CCW_READ;
	270	} else if (rq_data_dir(req) == WRITE) {
	271	cmd = DASD_FBA_CCW_WRITE;
	272	} else
	273	return ERR_PTR(-EINVAL);
8e09f215	274	blksize = block->bp_block;
1da177e4	275	/* Calculate record id of first and last block. */
83096ebf TH	276	first_rec = blk_rq_pos(req) >> block->s2b_shift;
	277	last_rec =
	278	(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
1da177e4 LT	279	/* Check struct bio and count the number of blocks for the request. */
	280	count = 0;
	281	cidaw = 0;
5705f702	282	rq_for_each_segment(bv, req, iter) {
6c92e699 JA	283	if (bv->bv_len & (blksize - 1))
	284	/* Fba can only do full blocks. */
	285	return ERR_PTR(-EINVAL);
8e09f215	286	count += bv->bv_len >> (block->s2b_shift + 9);
347a8dc3	287	#if defined(CONFIG_64BIT)
6c92e699 JA	288	if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
6c92e699 JA	289	cidaw += bv->bv_len / blksize;
1da177e4	290	#endif
1da177e4 LT	291	}
	292	/* Paranoia. */
	293	if (count != last_rec - first_rec + 1)
	294	return ERR_PTR(-EINVAL);
	295	/* 1x define extent + 1x locate record + number of blocks */
	296	cplength = 2 + count;
	297	/* 1x define extent + 1x locate record */
	298	datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
	299	cidaw * sizeof(unsigned long);
	300	/*
	301	* Find out number of additional locate record ccws if the device
	302	* can't do data chaining.
	303	*/
	304	if (private->rdc_data.mode.bits.data_chain == 0) {
	305	cplength += count - 1;
	306	datasize += (count - 1)*sizeof(struct LO_fba_data);
	307	}
	308	/* Allocate the ccw request. */
68b781fe	309	cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
1da177e4 LT	310	if (IS_ERR(cqr))
	311	return cqr;
	312	ccw = cqr->cpaddr;
	313	/* First ccw is define extent. */
	314	define_extent(ccw++, cqr->data, rq_data_dir(req),
83096ebf	315	block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
1da177e4 LT	316	/* Build locate_record + read/write ccws. */
	317	idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
	318	LO_data = (struct LO_fba_data *) (idaws + cidaw);
	319	/* Locate record for all blocks for smart devices. */
	320	if (private->rdc_data.mode.bits.data_chain != 0) {
	321	ccw[-1].flags \|= CCW_FLAG_CC;
	322	locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
	323	}
	324	recid = first_rec;
5705f702	325	rq_for_each_segment(bv, req, iter) {
1da177e4 LT	326	dst = page_address(bv->bv_page) + bv->bv_offset;
	327	if (dasd_page_cache) {
	328	char *copy = kmem_cache_alloc(dasd_page_cache,
441e143e	329	GFP_DMA \| __GFP_NOWARN);
1da177e4 LT	330	if (copy && rq_data_dir(req) == WRITE)
	331	memcpy(copy + bv->bv_offset, dst, bv->bv_len);
	332	if (copy)
	333	dst = copy + bv->bv_offset;
	334	}
	335	for (off = 0; off < bv->bv_len; off += blksize) {
	336	/* Locate record for stupid devices. */
	337	if (private->rdc_data.mode.bits.data_chain == 0) {
	338	ccw[-1].flags \|= CCW_FLAG_CC;
	339	locate_record(ccw, LO_data++,
	340	rq_data_dir(req),
	341	recid - first_rec, 1);
	342	ccw->flags = CCW_FLAG_CC;
	343	ccw++;
	344	} else {
	345	if (recid > first_rec)
	346	ccw[-1].flags \|= CCW_FLAG_DC;
	347	else
	348	ccw[-1].flags \|= CCW_FLAG_CC;
	349	}
	350	ccw->cmd_code = cmd;
8e09f215	351	ccw->count = block->bp_block;
1da177e4 LT	352	if (idal_is_needed(dst, blksize)) {
	353	ccw->cda = (__u32)(addr_t) idaws;
	354	ccw->flags = CCW_FLAG_IDA;
	355	idaws = idal_create_words(idaws, dst, blksize);
	356	} else {
	357	ccw->cda = (__u32)(addr_t) dst;
	358	ccw->flags = 0;
	359	}
	360	ccw++;
	361	dst += blksize;
	362	recid++;
	363	}
	364	}
13de227b HS	365	if (blk_noretry_request(req) \|\|
13de227b HS	366	block->base->features & DASD_FEATURE_FAILFAST)
1c01b8a5	367	set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
8e09f215 SW	368	cqr->startdev = memdev;
	369	cqr->memdev = memdev;
	370	cqr->block = block;
7c8faa86	371	cqr->expires = memdev->default_expires * HZ; /* default 5 minutes */
d61f6f3d HH	372	cqr->retries = 32;
d61f6f3d HH	373	cqr->buildclk = get_clock();
1da177e4 LT	374	cqr->status = DASD_CQR_FILLED;
	375	return cqr;
	376	}
	377
	378	static int
	379	dasd_fba_free_cp(struct dasd_ccw_req cqr, struct request req)
	380	{
	381	struct dasd_fba_private *private;
	382	struct ccw1 *ccw;
5705f702	383	struct req_iterator iter;
1da177e4 LT	384	struct bio_vec *bv;
	385	char dst, cda;
	386	unsigned int blksize, off;
5705f702	387	int status;
1da177e4 LT	388
	389	if (!dasd_page_cache)
	390	goto out;
8e09f215 SW	391	private = (struct dasd_fba_private *) cqr->block->base->private;
8e09f215 SW	392	blksize = cqr->block->bp_block;
1da177e4 LT	393	ccw = cqr->cpaddr;
	394	/* Skip over define extent & locate record. */
	395	ccw++;
	396	if (private->rdc_data.mode.bits.data_chain != 0)
	397	ccw++;
5705f702	398	rq_for_each_segment(bv, req, iter) {
1da177e4 LT	399	dst = page_address(bv->bv_page) + bv->bv_offset;
	400	for (off = 0; off < bv->bv_len; off += blksize) {
	401	/* Skip locate record. */
	402	if (private->rdc_data.mode.bits.data_chain == 0)
	403	ccw++;
	404	if (dst) {
	405	if (ccw->flags & CCW_FLAG_IDA)
	406	cda = ((char *)((addr_t) ccw->cda));
	407	else
	408	cda = (char *)((addr_t) ccw->cda);
	409	if (dst != cda) {
	410	if (rq_data_dir(req) == READ)
	411	memcpy(dst, cda, bv->bv_len);
	412	kmem_cache_free(dasd_page_cache,
	413	(void *)((addr_t)cda & PAGE_MASK));
	414	}
	415	dst = NULL;
	416	}
	417	ccw++;
	418	}
	419	}
	420	out:
	421	status = cqr->status == DASD_CQR_DONE;
8e09f215	422	dasd_sfree_request(cqr, cqr->memdev);
1da177e4 LT	423	return status;
	424	}
	425
8e09f215 SW	426	static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
	427	{
	428	cqr->status = DASD_CQR_FILLED;
	429	};
	430
1da177e4 LT	431	static int
	432	dasd_fba_fill_info(struct dasd_device * device,
	433	struct dasd_information2_t * info)
	434	{
	435	info->label_block = 1;
	436	info->FBA_layout = 1;
	437	info->format = DASD_FORMAT_LDL;
	438	info->characteristics_size = sizeof(struct dasd_fba_characteristics);
	439	memcpy(info->characteristics,
	440	&((struct dasd_fba_private *) device->private)->rdc_data,
	441	sizeof (struct dasd_fba_characteristics));
	442	info->confdata_size = 0;
	443	return 0;
	444	}
	445
fc19f381	446	static void
aeec92ca SH	447	dasd_fba_dump_sense_dbf(struct dasd_device device, struct irb irb,
aeec92ca SH	448	char *reason)
fc19f381	449	{
aeec92ca SH	450	u64 *sense;
	451
	452	sense = (u64 *) dasd_get_sense(irb);
	453	if (sense) {
	454	DBF_DEV_EVENT(DBF_EMERG, device,
	455	"%s: %s %02x%02x%02x %016llx %016llx %016llx "
	456	"%016llx", reason,
	457	scsw_is_tm(&irb->scsw) ? "t" : "c",
	458	scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
	459	scsw_dstat(&irb->scsw), sense[0], sense[1],
	460	sense[2], sense[3]);
fc19f381 SH	461	} else {
	462	DBF_DEV_EVENT(DBF_EMERG, device, "%s",
	463	"SORRY - NO VALID SENSE AVAILABLE\n");
	464	}
	465	}
	466
	467
1da177e4 LT	468	static void
	469	dasd_fba_dump_sense(struct dasd_device device, struct dasd_ccw_req req,
	470	struct irb *irb)
	471	{
	472	char *page;
	473	struct ccw1 act, end, *last;
	474	int len, sl, sct, count;
	475
	476	page = (char *) get_zeroed_page(GFP_ATOMIC);
	477	if (page == NULL) {
fc19f381	478	DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1da177e4 LT	479	"No memory to dump sense data");
	480	return;
	481	}
773bab4a	482	len = sprintf(page, PRINTK_HEADER
1da177e4	483	" I/O status report for device %s:\n",
2a0217d5	484	dev_name(&device->cdev->dev));
773bab4a	485	len += sprintf(page + len, PRINTK_HEADER
1da177e4	486	" in req: %p CS: 0x%02X DS: 0x%02X\n", req,
23d805b6	487	irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
773bab4a	488	len += sprintf(page + len, PRINTK_HEADER
1da177e4	489	" device %s: Failing CCW: %p\n",
2a0217d5	490	dev_name(&device->cdev->dev),
23d805b6	491	(void *) (addr_t) irb->scsw.cmd.cpa);
1da177e4 LT	492	if (irb->esw.esw0.erw.cons) {
1da177e4 LT	493	for (sl = 0; sl < 4; sl++) {
773bab4a	494	len += sprintf(page + len, PRINTK_HEADER
1da177e4 LT	495	" Sense(hex) %2d-%2d:",
	496	(8 * sl), ((8 * sl) + 7));
	497
	498	for (sct = 0; sct < 8; sct++) {
	499	len += sprintf(page + len, " %02x",
	500	irb->ecw[8 * sl + sct]);
	501	}
	502	len += sprintf(page + len, "\n");
	503	}
	504	} else {
773bab4a	505	len += sprintf(page + len, PRINTK_HEADER
1da177e4 LT	506	" SORRY - NO VALID SENSE AVAILABLE\n");
1da177e4 LT	507	}
fc19f381	508	printk(KERN_ERR "%s", page);
1da177e4 LT	509
	510	/* dump the Channel Program */
	511	/* print first CCWs (maximum 8) */
	512	act = req->cpaddr;
	513	for (last = act; last->flags & (CCW_FLAG_CC \| CCW_FLAG_DC); last++);
	514	end = min(act + 8, last);
773bab4a	515	len = sprintf(page, PRINTK_HEADER " Related CP in req: %p\n", req);
1da177e4	516	while (act <= end) {
773bab4a	517	len += sprintf(page + len, PRINTK_HEADER
1da177e4 LT	518	" CCW %p: %08X %08X DAT:",
	519	act, ((int ) act)[0], ((int ) act)[1]);
	520	for (count = 0; count < 32 && count < act->count;
	521	count += sizeof(int))
	522	len += sprintf(page + len, " %08X",
	523	((int *) (addr_t) act->cda)
	524	[(count>>2)]);
	525	len += sprintf(page + len, "\n");
	526	act++;
	527	}
fc19f381	528	printk(KERN_ERR "%s", page);
1da177e4 LT	529
	530
	531	/* print failing CCW area */
	532	len = 0;
23d805b6 PO	533	if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
23d805b6 PO	534	act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
773bab4a	535	len += sprintf(page + len, PRINTK_HEADER "......\n");
1da177e4	536	}
23d805b6	537	end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
1da177e4	538	while (act <= end) {
773bab4a	539	len += sprintf(page + len, PRINTK_HEADER
1da177e4 LT	540	" CCW %p: %08X %08X DAT:",
	541	act, ((int ) act)[0], ((int ) act)[1]);
	542	for (count = 0; count < 32 && count < act->count;
	543	count += sizeof(int))
	544	len += sprintf(page + len, " %08X",
	545	((int *) (addr_t) act->cda)
	546	[(count>>2)]);
	547	len += sprintf(page + len, "\n");
	548	act++;
	549	}
	550
	551	/* print last CCWs */
	552	if (act < last - 2) {
	553	act = last - 2;
773bab4a	554	len += sprintf(page + len, PRINTK_HEADER "......\n");
1da177e4 LT	555	}
1da177e4 LT	556	while (act <= last) {
773bab4a	557	len += sprintf(page + len, PRINTK_HEADER
1da177e4 LT	558	" CCW %p: %08X %08X DAT:",
	559	act, ((int ) act)[0], ((int ) act)[1]);
	560	for (count = 0; count < 32 && count < act->count;
	561	count += sizeof(int))
	562	len += sprintf(page + len, " %08X",
	563	((int *) (addr_t) act->cda)
	564	[(count>>2)]);
	565	len += sprintf(page + len, "\n");
	566	act++;
	567	}
	568	if (len > 0)
fc19f381	569	printk(KERN_ERR "%s", page);
1da177e4 LT	570	free_page((unsigned long) page);
	571	}
	572
	573	/*
	574	* max_blocks is dependent on the amount of storage that is available
	575	* in the static io buffer for each device. Currently each device has
	576	* 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
	577	* 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
	578	* up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
138c014d	579	* addition we have one define extent ccw + 16 bytes of data and a
1da177e4 LT	580	* locate record ccw for each block (stupid devices!) + 16 bytes of data.
	581	* That makes:
	582	* (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
	583	* We want to fit two into the available memory so that we can immediately
	584	* start the next request if one finishes off. That makes 100.1 blocks
	585	* for one request. Give a little safety and the result is 96.
	586	*/
	587	static struct dasd_discipline dasd_fba_discipline = {
	588	.owner = THIS_MODULE,
	589	.name = "FBA ",
	590	.ebcname = "FBA ",
	591	.max_blocks = 96,
	592	.check_device = dasd_fba_check_characteristics,
	593	.do_analysis = dasd_fba_do_analysis,
a4d26c6a	594	.verify_path = dasd_generic_verify_path,
1da177e4 LT	595	.fill_geometry = dasd_fba_fill_geometry,
	596	.start_IO = dasd_start_IO,
	597	.term_IO = dasd_term_IO,
8e09f215	598	.handle_terminated_request = dasd_fba_handle_terminated_request,
1da177e4 LT	599	.erp_action = dasd_fba_erp_action,
1da177e4 LT	600	.erp_postaction = dasd_fba_erp_postaction,
5a27e60d	601	.check_for_device_change = dasd_fba_check_for_device_change,
1da177e4 LT	602	.build_cp = dasd_fba_build_cp,
	603	.free_cp = dasd_fba_free_cp,
	604	.dump_sense = dasd_fba_dump_sense,
fc19f381	605	.dump_sense_dbf = dasd_fba_dump_sense_dbf,
1da177e4 LT	606	.fill_info = dasd_fba_fill_info,
	607	};
	608
	609	static int __init
	610	dasd_fba_init(void)
	611	{
736e6ea0 SO	612	int ret;
736e6ea0 SO	613
1da177e4	614	ASCEBC(dasd_fba_discipline.ebcname, 4);
736e6ea0 SO	615	ret = ccw_driver_register(&dasd_fba_driver);
	616	if (!ret)
	617	wait_for_device_probe();
	618
	619	return ret;
1da177e4 LT	620	}
	621
	622	static void __exit
	623	dasd_fba_cleanup(void)
	624	{
	625	ccw_driver_unregister(&dasd_fba_driver);
	626	}
	627
	628	module_init(dasd_fba_init);
	629	module_exit(dasd_fba_cleanup);