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

/*
 * 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 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;
	void *rdc_data;
	int rc;

	private = (struct dasd_fba_private *) device->private;
	if (private == NULL) {
		private = kzalloc(sizeof(struct dasd_fba_private),
				  GFP_KERNEL | GFP_DMA);
		if (private == NULL) {
			DEV_MESSAGE(KERN_WARNING, device, "%s",
				    "memory allocation failed for private "
				    "data");
			return -ENOMEM;
		}
		device->private = (void *) private;
	}
	block = dasd_alloc_block();
	if (IS_ERR(block)) {
		DEV_MESSAGE(KERN_WARNING, device, "%s",
			    "could not allocate dasd block structure");
		kfree(device->private);
		return PTR_ERR(block);
	}
	device->block = block;
	block->base = device;

	/* Read Device Characteristics */
	rdc_data = (void *) &(private->rdc_data);
	rc = dasd_generic_read_dev_chars(device, "FBA ", &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_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) {
		DEV_MESSAGE(KERN_INFO, 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;

	DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p",
		    cqr->function);
	return NULL;
}

static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
						   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);
		return;
	}

	/* check for unsolicited interrupts */
	DEV_MESSAGE(KERN_DEBUG, device, "%s",
		    "unsolicited interrupt received");
	device->discipline->dump_sense(device, NULL, irb);
	dasd_schedule_device_bh(device);
	return;
};

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 = req->sector >> block->s2b_shift;
	last_rec = (req->sector + req->nr_sectors - 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_discipline.name,
				   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, 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_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 (req->cmd_flags & REQ_FAILFAST)
		set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
	cqr->startdev = memdev;
	cqr->memdev = memdev;
	cqr->block = block;
	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 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(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.cmd.cstat, irb->scsw.cmd.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.cmd.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.cmd.cpa) - 2) {
		act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
		len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
	}
	end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.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,
	.handle_terminated_request = dasd_fba_handle_terminated_request,
	.erp_action = dasd_fba_erp_action,
	.erp_postaction = dasd_fba_erp_postaction,
	.handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
	.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);
Commit	Line	Data
138c014d	1	/*
1da177e4 LT	2	* File...........: linux/drivers/s390/block/dasd_fba.c
	3	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
	4	* Bugreports.to..: <Linux390@de.ibm.com>
	5	* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
	6	*
1da177e4 LT	7	*/
1da177e4 LT	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>
	22	#include <asm/todclk.h>
	23	#include <asm/ccwdev.h>
	24
	25	#include "dasd_int.h"
	26	#include "dasd_fba.h"
	27
	28	#ifdef PRINTK_HEADER
	29	#undef PRINTK_HEADER
	30	#endif /* PRINTK_HEADER */
	31	#define PRINTK_HEADER "dasd(fba):"
	32
	33	#define DASD_FBA_CCW_WRITE 0x41
	34	#define DASD_FBA_CCW_READ 0x42
	35	#define DASD_FBA_CCW_LOCATE 0x43
	36	#define DASD_FBA_CCW_DEFINE_EXTENT 0x63
	37
	38	MODULE_LICENSE("GPL");
	39
	40	static struct dasd_discipline dasd_fba_discipline;
	41
	42	struct dasd_fba_private {
	43	struct dasd_fba_characteristics rdc_data;
	44	};
	45
	46	static struct ccw_device_id dasd_fba_ids[] = {
d2c993d8 HC	47	{ CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
d2c993d8 HC	48	{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
1da177e4 LT	49	{ /* end of list */ },
	50	};
	51
	52	MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
	53
	54	static struct ccw_driver dasd_fba_driver; /* see below */
	55	static int
	56	dasd_fba_probe(struct ccw_device *cdev)
	57	{
40545573	58	return dasd_generic_probe(cdev, &dasd_fba_discipline);
1da177e4 LT	59	}
	60
	61	static int
	62	dasd_fba_set_online(struct ccw_device *cdev)
	63	{
40545573	64	return dasd_generic_set_online(cdev, &dasd_fba_discipline);
1da177e4 LT	65	}
	66
	67	static struct ccw_driver dasd_fba_driver = {
	68	.name = "dasd-fba",
	69	.owner = THIS_MODULE,
	70	.ids = dasd_fba_ids,
	71	.probe = dasd_fba_probe,
	72	.remove = dasd_generic_remove,
	73	.set_offline = dasd_generic_set_offline,
	74	.set_online = dasd_fba_set_online,
	75	.notify = dasd_generic_notify,
	76	};
	77
4d284cac	78	static void
1da177e4 LT	79	define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
	80	int blksize, int beg, int nr)
	81	{
	82	ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
	83	ccw->flags = 0;
	84	ccw->count = 16;
	85	ccw->cda = (__u32) __pa(data);
	86	memset(data, 0, sizeof (struct DE_fba_data));
	87	if (rw == WRITE)
	88	(data->mask).perm = 0x0;
	89	else if (rw == READ)
	90	(data->mask).perm = 0x1;
	91	else
	92	data->mask.perm = 0x2;
	93	data->blk_size = blksize;
	94	data->ext_loc = beg;
	95	data->ext_end = nr - 1;
	96	}
	97
4d284cac	98	static void
1da177e4 LT	99	locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
	100	int block_nr, int block_ct)
	101	{
	102	ccw->cmd_code = DASD_FBA_CCW_LOCATE;
	103	ccw->flags = 0;
	104	ccw->count = 8;
	105	ccw->cda = (__u32) __pa(data);
	106	memset(data, 0, sizeof (struct LO_fba_data));
	107	if (rw == WRITE)
	108	data->operation.cmd = 0x5;
	109	else if (rw == READ)
	110	data->operation.cmd = 0x6;
	111	else
	112	data->operation.cmd = 0x8;
	113	data->blk_nr = block_nr;
	114	data->blk_ct = block_ct;
	115	}
	116
	117	static int
	118	dasd_fba_check_characteristics(struct dasd_device *device)
	119	{
8e09f215	120	struct dasd_block *block;
1da177e4	121	struct dasd_fba_private *private;
138c014d	122	struct ccw_device *cdev = device->cdev;
1da177e4 LT	123	void *rdc_data;
	124	int rc;
	125
	126	private = (struct dasd_fba_private *) device->private;
	127	if (private == NULL) {
00966c0a SH	128	private = kzalloc(sizeof(struct dasd_fba_private),
00966c0a SH	129	GFP_KERNEL \| GFP_DMA);
1da177e4 LT	130	if (private == NULL) {
	131	DEV_MESSAGE(KERN_WARNING, device, "%s",
	132	"memory allocation failed for private "
	133	"data");
	134	return -ENOMEM;
	135	}
	136	device->private = (void *) private;
	137	}
8e09f215 SW	138	block = dasd_alloc_block();
	139	if (IS_ERR(block)) {
	140	DEV_MESSAGE(KERN_WARNING, device, "%s",
	141	"could not allocate dasd block structure");
	142	kfree(device->private);
	143	return PTR_ERR(block);
	144	}
	145	device->block = block;
	146	block->base = device;
	147
1da177e4 LT	148	/* Read Device Characteristics */
1da177e4 LT	149	rdc_data = (void *) &(private->rdc_data);
17283b56	150	rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
1da177e4 LT	151	if (rc) {
	152	DEV_MESSAGE(KERN_WARNING, device,
	153	"Read device characteristics returned error %d",
	154	rc);
	155	return rc;
	156	}
	157
	158	DEV_MESSAGE(KERN_INFO, device,
	159	"%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
	160	cdev->id.dev_type,
	161	cdev->id.dev_model,
	162	cdev->id.cu_type,
	163	cdev->id.cu_model,
	164	((private->rdc_data.blk_bdsa *
	165	(private->rdc_data.blk_size >> 9)) >> 11),
	166	private->rdc_data.blk_size);
	167	return 0;
	168	}
	169
8e09f215	170	static int dasd_fba_do_analysis(struct dasd_block *block)
1da177e4 LT	171	{
	172	struct dasd_fba_private *private;
	173	int sb, rc;
	174
8e09f215	175	private = (struct dasd_fba_private *) block->base->private;
1da177e4 LT	176	rc = dasd_check_blocksize(private->rdc_data.blk_size);
1da177e4 LT	177	if (rc) {
8e09f215	178	DEV_MESSAGE(KERN_INFO, block->base, "unknown blocksize %d",
1da177e4 LT	179	private->rdc_data.blk_size);
	180	return rc;
	181	}
8e09f215 SW	182	block->blocks = private->rdc_data.blk_bdsa;
	183	block->bp_block = private->rdc_data.blk_size;
	184	block->s2b_shift = 0; /* bits to shift 512 to get a block */
1da177e4	185	for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
8e09f215	186	block->s2b_shift++;
1da177e4 LT	187	return 0;
	188	}
	189
8e09f215 SW	190	static int dasd_fba_fill_geometry(struct dasd_block *block,
8e09f215 SW	191	struct hd_geometry *geo)
1da177e4	192	{
8e09f215	193	if (dasd_check_blocksize(block->bp_block) != 0)
1da177e4	194	return -EINVAL;
8e09f215	195	geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
1da177e4	196	geo->heads = 16;
8e09f215	197	geo->sectors = 128 >> block->s2b_shift;
1da177e4 LT	198	return 0;
	199	}
	200
1da177e4 LT	201	static dasd_erp_fn_t
	202	dasd_fba_erp_action(struct dasd_ccw_req * cqr)
	203	{
	204	return dasd_default_erp_action;
	205	}
	206
	207	static dasd_erp_fn_t
	208	dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
	209	{
	210	if (cqr->function == dasd_default_erp_action)
	211	return dasd_default_erp_postaction;
	212
8e09f215	213	DEV_MESSAGE(KERN_WARNING, cqr->startdev, "unknown ERP action %p",
1da177e4 LT	214	cqr->function);
	215	return NULL;
	216	}
	217
8e09f215 SW	218	static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
	219	struct irb *irb)
	220	{
	221	char mask;
	222
	223	/* first of all check for state change pending interrupt */
	224	mask = DEV_STAT_ATTENTION \| DEV_STAT_DEV_END \| DEV_STAT_UNIT_EXCEP;
23d805b6	225	if ((irb->scsw.cmd.dstat & mask) == mask) {
8e09f215 SW	226	dasd_generic_handle_state_change(device);
	227	return;
	228	}
	229
	230	/* check for unsolicited interrupts */
	231	DEV_MESSAGE(KERN_DEBUG, device, "%s",
	232	"unsolicited interrupt received");
	233	device->discipline->dump_sense(device, NULL, irb);
	234	dasd_schedule_device_bh(device);
	235	return;
	236	};
	237
	238	static struct dasd_ccw_req dasd_fba_build_cp(struct dasd_device memdev,
	239	struct dasd_block *block,
	240	struct request *req)
1da177e4 LT	241	{
	242	struct dasd_fba_private *private;
	243	unsigned long *idaws;
	244	struct LO_fba_data *LO_data;
	245	struct dasd_ccw_req *cqr;
	246	struct ccw1 *ccw;
5705f702	247	struct req_iterator iter;
1da177e4 LT	248	struct bio_vec *bv;
	249	char *dst;
	250	int count, cidaw, cplength, datasize;
	251	sector_t recid, first_rec, last_rec;
	252	unsigned int blksize, off;
	253	unsigned char cmd;
1da177e4	254
8e09f215	255	private = (struct dasd_fba_private *) block->base->private;
1da177e4 LT	256	if (rq_data_dir(req) == READ) {
	257	cmd = DASD_FBA_CCW_READ;
	258	} else if (rq_data_dir(req) == WRITE) {
	259	cmd = DASD_FBA_CCW_WRITE;
	260	} else
	261	return ERR_PTR(-EINVAL);
8e09f215	262	blksize = block->bp_block;
1da177e4	263	/* Calculate record id of first and last block. */
8e09f215 SW	264	first_rec = req->sector >> block->s2b_shift;
8e09f215 SW	265	last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
1da177e4 LT	266	/* Check struct bio and count the number of blocks for the request. */
	267	count = 0;
	268	cidaw = 0;
5705f702	269	rq_for_each_segment(bv, req, iter) {
6c92e699 JA	270	if (bv->bv_len & (blksize - 1))
	271	/* Fba can only do full blocks. */
	272	return ERR_PTR(-EINVAL);
8e09f215	273	count += bv->bv_len >> (block->s2b_shift + 9);
347a8dc3	274	#if defined(CONFIG_64BIT)
6c92e699 JA	275	if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
6c92e699 JA	276	cidaw += bv->bv_len / blksize;
1da177e4	277	#endif
1da177e4 LT	278	}
	279	/* Paranoia. */
	280	if (count != last_rec - first_rec + 1)
	281	return ERR_PTR(-EINVAL);
	282	/* 1x define extent + 1x locate record + number of blocks */
	283	cplength = 2 + count;
	284	/* 1x define extent + 1x locate record */
	285	datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
	286	cidaw * sizeof(unsigned long);
	287	/*
	288	* Find out number of additional locate record ccws if the device
	289	* can't do data chaining.
	290	*/
	291	if (private->rdc_data.mode.bits.data_chain == 0) {
	292	cplength += count - 1;
	293	datasize += (count - 1)*sizeof(struct LO_fba_data);
	294	}
	295	/* Allocate the ccw request. */
	296	cqr = dasd_smalloc_request(dasd_fba_discipline.name,
8e09f215	297	cplength, datasize, memdev);
1da177e4 LT	298	if (IS_ERR(cqr))
	299	return cqr;
	300	ccw = cqr->cpaddr;
	301	/* First ccw is define extent. */
	302	define_extent(ccw++, cqr->data, rq_data_dir(req),
8e09f215	303	block->bp_block, req->sector, req->nr_sectors);
1da177e4 LT	304	/* Build locate_record + read/write ccws. */
	305	idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
	306	LO_data = (struct LO_fba_data *) (idaws + cidaw);
	307	/* Locate record for all blocks for smart devices. */
	308	if (private->rdc_data.mode.bits.data_chain != 0) {
	309	ccw[-1].flags \|= CCW_FLAG_CC;
	310	locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
	311	}
	312	recid = first_rec;
5705f702	313	rq_for_each_segment(bv, req, iter) {
1da177e4 LT	314	dst = page_address(bv->bv_page) + bv->bv_offset;
	315	if (dasd_page_cache) {
	316	char *copy = kmem_cache_alloc(dasd_page_cache,
441e143e	317	GFP_DMA \| __GFP_NOWARN);
1da177e4 LT	318	if (copy && rq_data_dir(req) == WRITE)
	319	memcpy(copy + bv->bv_offset, dst, bv->bv_len);
	320	if (copy)
	321	dst = copy + bv->bv_offset;
	322	}
	323	for (off = 0; off < bv->bv_len; off += blksize) {
	324	/* Locate record for stupid devices. */
	325	if (private->rdc_data.mode.bits.data_chain == 0) {
	326	ccw[-1].flags \|= CCW_FLAG_CC;
	327	locate_record(ccw, LO_data++,
	328	rq_data_dir(req),
	329	recid - first_rec, 1);
	330	ccw->flags = CCW_FLAG_CC;
	331	ccw++;
	332	} else {
	333	if (recid > first_rec)
	334	ccw[-1].flags \|= CCW_FLAG_DC;
	335	else
	336	ccw[-1].flags \|= CCW_FLAG_CC;
	337	}
	338	ccw->cmd_code = cmd;
8e09f215	339	ccw->count = block->bp_block;
1da177e4 LT	340	if (idal_is_needed(dst, blksize)) {
	341	ccw->cda = (__u32)(addr_t) idaws;
	342	ccw->flags = CCW_FLAG_IDA;
	343	idaws = idal_create_words(idaws, dst, blksize);
	344	} else {
	345	ccw->cda = (__u32)(addr_t) dst;
	346	ccw->flags = 0;
	347	}
	348	ccw++;
	349	dst += blksize;
	350	recid++;
	351	}
	352	}
4aff5e23	353	if (req->cmd_flags & REQ_FAILFAST)
1c01b8a5	354	set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
8e09f215 SW	355	cqr->startdev = memdev;
	356	cqr->memdev = memdev;
	357	cqr->block = block;
1da177e4	358	cqr->expires = 5 * 60 * HZ; /* 5 minutes */
d61f6f3d HH	359	cqr->retries = 32;
d61f6f3d HH	360	cqr->buildclk = get_clock();
1da177e4 LT	361	cqr->status = DASD_CQR_FILLED;
	362	return cqr;
	363	}
	364
	365	static int
	366	dasd_fba_free_cp(struct dasd_ccw_req cqr, struct request req)
	367	{
	368	struct dasd_fba_private *private;
	369	struct ccw1 *ccw;
5705f702	370	struct req_iterator iter;
1da177e4 LT	371	struct bio_vec *bv;
	372	char dst, cda;
	373	unsigned int blksize, off;
5705f702	374	int status;
1da177e4 LT	375
	376	if (!dasd_page_cache)
	377	goto out;
8e09f215 SW	378	private = (struct dasd_fba_private *) cqr->block->base->private;
8e09f215 SW	379	blksize = cqr->block->bp_block;
1da177e4 LT	380	ccw = cqr->cpaddr;
	381	/* Skip over define extent & locate record. */
	382	ccw++;
	383	if (private->rdc_data.mode.bits.data_chain != 0)
	384	ccw++;
5705f702	385	rq_for_each_segment(bv, req, iter) {
1da177e4 LT	386	dst = page_address(bv->bv_page) + bv->bv_offset;
	387	for (off = 0; off < bv->bv_len; off += blksize) {
	388	/* Skip locate record. */
	389	if (private->rdc_data.mode.bits.data_chain == 0)
	390	ccw++;
	391	if (dst) {
	392	if (ccw->flags & CCW_FLAG_IDA)
	393	cda = ((char *)((addr_t) ccw->cda));
	394	else
	395	cda = (char *)((addr_t) ccw->cda);
	396	if (dst != cda) {
	397	if (rq_data_dir(req) == READ)
	398	memcpy(dst, cda, bv->bv_len);
	399	kmem_cache_free(dasd_page_cache,
	400	(void *)((addr_t)cda & PAGE_MASK));
	401	}
	402	dst = NULL;
	403	}
	404	ccw++;
	405	}
	406	}
	407	out:
	408	status = cqr->status == DASD_CQR_DONE;
8e09f215	409	dasd_sfree_request(cqr, cqr->memdev);
1da177e4 LT	410	return status;
	411	}
	412
8e09f215 SW	413	static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
	414	{
	415	cqr->status = DASD_CQR_FILLED;
	416	};
	417
1da177e4 LT	418	static int
	419	dasd_fba_fill_info(struct dasd_device * device,
	420	struct dasd_information2_t * info)
	421	{
	422	info->label_block = 1;
	423	info->FBA_layout = 1;
	424	info->format = DASD_FORMAT_LDL;
	425	info->characteristics_size = sizeof(struct dasd_fba_characteristics);
	426	memcpy(info->characteristics,
	427	&((struct dasd_fba_private *) device->private)->rdc_data,
	428	sizeof (struct dasd_fba_characteristics));
	429	info->confdata_size = 0;
	430	return 0;
	431	}
	432
	433	static void
	434	dasd_fba_dump_sense(struct dasd_device device, struct dasd_ccw_req req,
	435	struct irb *irb)
	436	{
	437	char *page;
	438	struct ccw1 act, end, *last;
	439	int len, sl, sct, count;
	440
	441	page = (char *) get_zeroed_page(GFP_ATOMIC);
	442	if (page == NULL) {
	443	DEV_MESSAGE(KERN_ERR, device, " %s",
	444	"No memory to dump sense data");
	445	return;
	446	}
	447	len = sprintf(page, KERN_ERR PRINTK_HEADER
	448	" I/O status report for device %s:\n",
	449	device->cdev->dev.bus_id);
	450	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	451	" in req: %p CS: 0x%02X DS: 0x%02X\n", req,
23d805b6	452	irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
1da177e4 LT	453	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	454	" device %s: Failing CCW: %p\n",
	455	device->cdev->dev.bus_id,
23d805b6	456	(void *) (addr_t) irb->scsw.cmd.cpa);
1da177e4 LT	457	if (irb->esw.esw0.erw.cons) {
	458	for (sl = 0; sl < 4; sl++) {
	459	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	460	" Sense(hex) %2d-%2d:",
	461	(8 * sl), ((8 * sl) + 7));
	462
	463	for (sct = 0; sct < 8; sct++) {
	464	len += sprintf(page + len, " %02x",
	465	irb->ecw[8 * sl + sct]);
	466	}
	467	len += sprintf(page + len, "\n");
	468	}
	469	} else {
	470	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	471	" SORRY - NO VALID SENSE AVAILABLE\n");
	472	}
	473	MESSAGE_LOG(KERN_ERR, "%s",
	474	page + sizeof(KERN_ERR PRINTK_HEADER));
	475
	476	/* dump the Channel Program */
	477	/* print first CCWs (maximum 8) */
	478	act = req->cpaddr;
	479	for (last = act; last->flags & (CCW_FLAG_CC \| CCW_FLAG_DC); last++);
	480	end = min(act + 8, last);
	481	len = sprintf(page, KERN_ERR PRINTK_HEADER
	482	" Related CP in req: %p\n", req);
	483	while (act <= end) {
	484	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	485	" CCW %p: %08X %08X DAT:",
	486	act, ((int ) act)[0], ((int ) act)[1]);
	487	for (count = 0; count < 32 && count < act->count;
	488	count += sizeof(int))
	489	len += sprintf(page + len, " %08X",
	490	((int *) (addr_t) act->cda)
	491	[(count>>2)]);
	492	len += sprintf(page + len, "\n");
	493	act++;
	494	}
	495	MESSAGE_LOG(KERN_ERR, "%s",
	496	page + sizeof(KERN_ERR PRINTK_HEADER));
	497
	498
	499	/* print failing CCW area */
	500	len = 0;
23d805b6 PO	501	if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
23d805b6 PO	502	act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
1da177e4 LT	503	len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1da177e4 LT	504	}
23d805b6	505	end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
1da177e4 LT	506	while (act <= end) {
	507	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	508	" CCW %p: %08X %08X DAT:",
	509	act, ((int ) act)[0], ((int ) act)[1]);
	510	for (count = 0; count < 32 && count < act->count;
	511	count += sizeof(int))
	512	len += sprintf(page + len, " %08X",
	513	((int *) (addr_t) act->cda)
	514	[(count>>2)]);
	515	len += sprintf(page + len, "\n");
	516	act++;
	517	}
	518
	519	/* print last CCWs */
	520	if (act < last - 2) {
	521	act = last - 2;
	522	len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
	523	}
	524	while (act <= last) {
	525	len += sprintf(page + len, KERN_ERR PRINTK_HEADER
	526	" CCW %p: %08X %08X DAT:",
	527	act, ((int ) act)[0], ((int ) act)[1]);
	528	for (count = 0; count < 32 && count < act->count;
	529	count += sizeof(int))
	530	len += sprintf(page + len, " %08X",
	531	((int *) (addr_t) act->cda)
	532	[(count>>2)]);
	533	len += sprintf(page + len, "\n");
	534	act++;
	535	}
	536	if (len > 0)
	537	MESSAGE_LOG(KERN_ERR, "%s",
	538	page + sizeof(KERN_ERR PRINTK_HEADER));
	539	free_page((unsigned long) page);
	540	}
	541
	542	/*
	543	* max_blocks is dependent on the amount of storage that is available
	544	* in the static io buffer for each device. Currently each device has
	545	* 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
	546	* 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
	547	* up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
138c014d	548	* addition we have one define extent ccw + 16 bytes of data and a
1da177e4 LT	549	* locate record ccw for each block (stupid devices!) + 16 bytes of data.
	550	* That makes:
	551	* (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
	552	* We want to fit two into the available memory so that we can immediately
	553	* start the next request if one finishes off. That makes 100.1 blocks
	554	* for one request. Give a little safety and the result is 96.
	555	*/
	556	static struct dasd_discipline dasd_fba_discipline = {
	557	.owner = THIS_MODULE,
	558	.name = "FBA ",
	559	.ebcname = "FBA ",
	560	.max_blocks = 96,
	561	.check_device = dasd_fba_check_characteristics,
	562	.do_analysis = dasd_fba_do_analysis,
	563	.fill_geometry = dasd_fba_fill_geometry,
	564	.start_IO = dasd_start_IO,
	565	.term_IO = dasd_term_IO,
8e09f215	566	.handle_terminated_request = dasd_fba_handle_terminated_request,
1da177e4 LT	567	.erp_action = dasd_fba_erp_action,
1da177e4 LT	568	.erp_postaction = dasd_fba_erp_postaction,
8e09f215	569	.handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
1da177e4 LT	570	.build_cp = dasd_fba_build_cp,
	571	.free_cp = dasd_fba_free_cp,
	572	.dump_sense = dasd_fba_dump_sense,
	573	.fill_info = dasd_fba_fill_info,
	574	};
	575
	576	static int __init
	577	dasd_fba_init(void)
	578	{
1da177e4	579	ASCEBC(dasd_fba_discipline.ebcname, 4);
40545573	580	return ccw_driver_register(&dasd_fba_driver);
1da177e4 LT	581	}
	582
	583	static void __exit
	584	dasd_fba_cleanup(void)
	585	{
	586	ccw_driver_unregister(&dasd_fba_driver);
	587	}
	588
	589	module_init(dasd_fba_init);
	590	module_exit(dasd_fba_cleanup);