dasd_eckd.c

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/* 
 * File...........: linux/drivers/s390/block/dasd_eckd.c
 * Author(s)......: Holger Smolinski <[e-mail]>
 *		    Horst Hummel <[e-mail]> 
 *		    Carsten Otte <[e-mail]>
 *		    Martin Schwidefsky <[e-mail]>
 * Bugreports.to..: <[e-mail]>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
 *
 * $Revision: 1.57 $
 */

#include <linux/config.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hdreg.h>	/* HDIO_GETGEO			    */
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/init.h>

#include <asm/debug.h>
#include <asm/idals.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/todclk.h>
#include <asm/uaccess.h>
#include <asm/ccwdev.h>

#include "dasd_int.h"
#include "dasd_eckd.h"

#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif				/* PRINTK_HEADER */
#define PRINTK_HEADER "dasd(eckd):"

#define ECKD_C0(i) (i->home_bytes)
#define ECKD_F(i) (i->formula)
#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):(i->factors.f_0x02.f1))
#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):(i->factors.f_0x02.f2))
#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):(i->factors.f_0x02.f3))
#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
#define ECKD_F6(i) (i->factor6)
#define ECKD_F7(i) (i->factor7)
#define ECKD_F8(i) (i->factor8)

MODULE_LICENSE("GPL");

static struct dasd_discipline dasd_eckd_discipline;

struct dasd_eckd_private {
	struct dasd_eckd_characteristics rdc_data;
	struct dasd_eckd_confdata conf_data;
	struct eckd_count count_area[5];
	int init_cqr_status;
	int uses_cdl;
	struct attrib_data_t attrib;	/* e.g. cache operations */
};

/* The ccw bus type uses this table to find devices that it sends to
 * dasd_eckd_probe */
static struct ccw_device_id dasd_eckd_ids[] = {
	{ CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1},
	{ CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2},
	{ CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3},
	{ CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4},
	{ CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5},
	{ CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6},
	{ /* end of list */ },
};

MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);

static struct ccw_driver dasd_eckd_driver; /* see below */

/* initial attempt at a probe function. this can be simplified once
 * the other detection code is gone */
static int
dasd_eckd_probe (struct ccw_device *cdev)
{
	int ret;

	ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
	if (ret)
		return ret;
	ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
	return 0;
}

static int
dasd_eckd_set_online(struct ccw_device *cdev)
{
	return dasd_generic_set_online (cdev, &dasd_eckd_discipline);
}

static struct ccw_driver dasd_eckd_driver = {
	.name        = "dasd-eckd",
	.owner       = THIS_MODULE,
	.ids         = dasd_eckd_ids,
	.probe       = dasd_eckd_probe,
	.remove      = dasd_generic_remove,
	.set_offline = dasd_generic_set_offline,
	.set_online  = dasd_eckd_set_online,
	.notify      = dasd_generic_notify,
};

static const int sizes_trk0[] = { 28, 148, 84 };
#define LABEL_SIZE 140

static inline unsigned int
round_up_multiple(unsigned int no, unsigned int mult)
{
	int rem = no % mult;
	return (rem ? no - rem + mult : no);
}

static inline unsigned int
ceil_quot(unsigned int d1, unsigned int d2)
{
	return (d1 + (d2 - 1)) / d2;
}

static inline int
bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl)
{
	unsigned int fl1, fl2, int1, int2;
	int bpr;

	switch (rdc->formula) {
	case 0x01:
		fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc));
		fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0,
					ECKD_F1(rdc));
		bpr = fl1 + fl2;
		break;
	case 0x02:
		int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
		int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
		fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl +
					ECKD_F6(rdc) + ECKD_F4(rdc) * int1,
					ECKD_F1(rdc));
		fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl +
					ECKD_F6(rdc) + ECKD_F4(rdc) * int2,
					ECKD_F1(rdc));
		bpr = fl1 + fl2;
		break;
	default:
		MESSAGE(KERN_ERR, "unknown formula%d", rdc->formula);
		bpr = 0;
		break;
	}
	return bpr;
}

static inline unsigned int
bytes_per_track(struct dasd_eckd_characteristics *rdc)
{
	return *(unsigned int *) (rdc->byte_per_track) >> 8;
}

static inline unsigned int
recs_per_track(struct dasd_eckd_characteristics * rdc,
	       unsigned int kl, unsigned int dl)
{
	int dn, kn;

	switch (rdc->dev_type) {
	case 0x3380:
		if (kl)
			return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
				       ceil_quot(dl + 12, 32));
		else
			return 1499 / (15 + ceil_quot(dl + 12, 32));
	case 0x3390:
		dn = ceil_quot(dl + 6, 232) + 1;
		if (kl) {
			kn = ceil_quot(kl + 6, 232) + 1;
			return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
				       9 + ceil_quot(dl + 6 * dn, 34));
		} else
			return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
	case 0x9345:
		dn = ceil_quot(dl + 6, 232) + 1;
		if (kl) {
			kn = ceil_quot(kl + 6, 232) + 1;
			return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
				       ceil_quot(dl + 6 * dn, 34));
		} else
			return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
	}
	return 0;
}

static inline void
check_XRC (struct ccw1         *de_ccw,
           struct DE_eckd_data *data,
           struct dasd_device  *device)
{
        struct dasd_eckd_private *private;

        private = (struct dasd_eckd_private *) device->private;

        /* switch on System Time Stamp - needed for XRC Support */
        if (private->rdc_data.facilities.XRC_supported) {
                
                data->ga_extended |= 0x08;   /* switch on 'Time Stamp Valid'   */
                data->ga_extended |= 0x02;   /* switch on 'Extended Parameter' */
                
                data->ep_sys_time = get_clock ();
                
                de_ccw->count = sizeof (struct DE_eckd_data);
                de_ccw->flags |= CCW_FLAG_SLI;  
        }

        return;

} /* end check_XRC */

static inline void
define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
	      int totrk, int cmd, struct dasd_device * device)
{
	struct dasd_eckd_private *private;
	struct ch_t geo, beg, end;

	private = (struct dasd_eckd_private *) device->private;

	ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
	ccw->flags = 0;
	ccw->count = 16;
	ccw->cda = (__u32) __pa(data);

	memset(data, 0, sizeof (struct DE_eckd_data));
	switch (cmd) {
	case DASD_ECKD_CCW_READ_HOME_ADDRESS:
	case DASD_ECKD_CCW_READ_RECORD_ZERO:
	case DASD_ECKD_CCW_READ:
	case DASD_ECKD_CCW_READ_MT:
	case DASD_ECKD_CCW_READ_CKD:
	case DASD_ECKD_CCW_READ_CKD_MT:
	case DASD_ECKD_CCW_READ_KD:
	case DASD_ECKD_CCW_READ_KD_MT:
	case DASD_ECKD_CCW_READ_COUNT:
		data->mask.perm = 0x1;
		data->attributes.operation = private->attrib.operation;
		break;
	case DASD_ECKD_CCW_WRITE:
	case DASD_ECKD_CCW_WRITE_MT:
	case DASD_ECKD_CCW_WRITE_KD:
	case DASD_ECKD_CCW_WRITE_KD_MT:
		data->mask.perm = 0x02;
		data->attributes.operation = private->attrib.operation;
                check_XRC (ccw, data, device);
		break;
	case DASD_ECKD_CCW_WRITE_CKD:
	case DASD_ECKD_CCW_WRITE_CKD_MT:
		data->attributes.operation = DASD_BYPASS_CACHE;
                check_XRC (ccw, data, device);
		break;
	case DASD_ECKD_CCW_ERASE:
	case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
	case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
		data->mask.perm = 0x3;
		data->mask.auth = 0x1;
		data->attributes.operation = DASD_BYPASS_CACHE;
                check_XRC (ccw, data, device);
		break;
	default:
		MESSAGE(KERN_ERR, "unknown opcode 0x%x", cmd);
		break;
	}

	data->attributes.mode = 0x3;	/* ECKD */

	if (private->rdc_data.cu_type == 0x2105
	    && !(private->uses_cdl && trk < 2))
		data->ga_extended |= 0x40;

	geo.cyl = private->rdc_data.no_cyl;
	geo.head = private->rdc_data.trk_per_cyl;
	beg.cyl = trk / geo.head;
	beg.head = trk % geo.head;
	end.cyl = totrk / geo.head;
	end.head = totrk % geo.head;

	/* check for sequential prestage - enhance cylinder range */
	if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
	    data->attributes.operation == DASD_SEQ_ACCESS) {
		
		if (end.cyl + private->attrib.nr_cyl < geo.cyl) 
			end.cyl += private->attrib.nr_cyl;
		else
			end.cyl = (geo.cyl - 1);
	}

	data->beg_ext.cyl = beg.cyl;
	data->beg_ext.head = beg.head;
	data->end_ext.cyl = end.cyl;
	data->end_ext.head = end.head;
}

static inline void
locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
	      int rec_on_trk, int no_rec, int cmd,
	      struct dasd_device * device, int reclen)
{
	struct dasd_eckd_private *private;
	int sector;
	int dn, d;
				
	private = (struct dasd_eckd_private *) device->private;

	DBF_EVENT(DBF_INFO,
		  "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
		  trk, rec_on_trk, no_rec, cmd, reclen);

	ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
	ccw->flags = 0;
	ccw->count = 16;
	ccw->cda = (__u32) __pa(data);

	memset(data, 0, sizeof (struct LO_eckd_data));
	sector = 0;
	if (rec_on_trk) {
		switch (private->rdc_data.dev_type) {
		case 0x3390:
			dn = ceil_quot(reclen + 6, 232);
			d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
			sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
			break;
		case 0x3380:
			d = 7 + ceil_quot(reclen + 12, 32);
			sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
			break;
		}
	}
	data->sector = sector;
	data->count = no_rec;
	switch (cmd) {
	case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
		data->operation.orientation = 0x3;
		data->operation.operation = 0x03;
		break;
	case DASD_ECKD_CCW_READ_HOME_ADDRESS:
		data->operation.orientation = 0x3;
		data->operation.operation = 0x16;
		break;
	case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
		data->operation.orientation = 0x1;
		data->operation.operation = 0x03;
		data->count++;
		break;
	case DASD_ECKD_CCW_READ_RECORD_ZERO:
		data->operation.orientation = 0x3;
		data->operation.operation = 0x16;
		data->count++;
		break;
	case DASD_ECKD_CCW_WRITE:
	case DASD_ECKD_CCW_WRITE_MT:
	case DASD_ECKD_CCW_WRITE_KD:
	case DASD_ECKD_CCW_WRITE_KD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x01;
		break;
	case DASD_ECKD_CCW_WRITE_CKD:
	case DASD_ECKD_CCW_WRITE_CKD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x03;
		break;
	case DASD_ECKD_CCW_READ:
	case DASD_ECKD_CCW_READ_MT:
	case DASD_ECKD_CCW_READ_KD:
	case DASD_ECKD_CCW_READ_KD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x06;
		break;
	case DASD_ECKD_CCW_READ_CKD:
	case DASD_ECKD_CCW_READ_CKD_MT:
		data->auxiliary.last_bytes_used = 0x1;
		data->length = reclen;
		data->operation.operation = 0x16;
		break;
	case DASD_ECKD_CCW_READ_COUNT:
		data->operation.operation = 0x06;
		break;
	case DASD_ECKD_CCW_ERASE:
		data->length = reclen;
		data->auxiliary.last_bytes_used = 0x1;
		data->operation.operation = 0x0b;
		break;
	default:
		MESSAGE(KERN_ERR, "unknown opcode 0x%x", cmd);
	}
	data->seek_addr.cyl = data->search_arg.cyl =
		trk / private->rdc_data.trk_per_cyl;
	data->seek_addr.head = data->search_arg.head =
		trk % private->rdc_data.trk_per_cyl;
	data->search_arg.record = rec_on_trk;
}

/*
 * Returns 1 if the block is one of the special blocks that needs
 * to get read/written with the KD variant of the command.
 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 * Luckily the KD variants differ only by one bit (0x08) from the
 * normal variant. So don't wonder about code like:
 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 *         ccw->cmd_code |= 0x8;
 */
static inline int
dasd_eckd_cdl_special(int blk_per_trk, int recid)
{
	if (recid < 3)
		return 1;
	if (recid < blk_per_trk)
		return 0;
	if (recid < 2 * blk_per_trk)
		return 1;
	return 0;
}

/*
 * Returns the record size for the special blocks of the cdl format.
 * Only returns something useful if dasd_eckd_cdl_special is true
 * for the recid.
 */
static inline int
dasd_eckd_cdl_reclen(int recid)
{
	if (recid < 3)
		return sizes_trk0[recid];
	return LABEL_SIZE;
}

static int
dasd_eckd_check_characteristics(struct dasd_device *device)
{
	struct dasd_eckd_private *private;
	void *rdc_data;
	void *conf_data;
	int conf_len;
	int rc;

	private = (struct dasd_eckd_private *) device->private;
	if (private == NULL) {
		private = kmalloc(sizeof(struct dasd_eckd_private),
				  GFP_KERNEL | GFP_DMA);
		if (private == NULL) {
			MESSAGE(KERN_WARNING, "%s",
				"memory allocation failed for private data");
			return -ENOMEM;
		}
		device->private = (void *) private;
	}
	/* Invalidate status of initial analysis. */
	private->init_cqr_status = -1;
	/* Set default cache operations. */
	private->attrib.operation = DASD_NORMAL_CACHE;
	private->attrib.nr_cyl = 0;

	/* Read Device Characteristics */
	rdc_data = (void *) &(private->rdc_data);
	rc = read_dev_chars(device->cdev, &rdc_data, 64);
	if (rc) {
		MESSAGE(KERN_WARNING,
			"Read device characteristics returned error %d", rc);
		return rc;
	}

	DEV_MESSAGE(KERN_INFO, device,
		    "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
		    private->rdc_data.dev_type,
		    private->rdc_data.dev_model,
		    private->rdc_data.cu_type,
		    private->rdc_data.cu_model.model,
		    private->rdc_data.no_cyl,
		    private->rdc_data.trk_per_cyl,
		    private->rdc_data.sec_per_trk);

	/* Read Configuration Data */
	rc = read_conf_data(device->cdev, &conf_data, &conf_len);
	if (rc && rc != -EOPNOTSUPP) {	/* -EOPNOTSUPP is ok */
		MESSAGE(KERN_WARNING,
			"Read configuration data returned error %d", rc);
		return rc;
	}
	if (conf_data == NULL) {
		MESSAGE(KERN_WARNING, "%s", "No configuration data retrieved");
		return 0;	/* no errror */
	}
	if (conf_len != sizeof (struct dasd_eckd_confdata)) {
		MESSAGE(KERN_WARNING,
			"sizes of configuration data mismatch"
			"%d (read) vs %ld (expected)",
			conf_len, sizeof (struct dasd_eckd_confdata));
		return 0;	/* no errror */
	}
	memcpy(&private->conf_data, conf_data,
	       sizeof (struct dasd_eckd_confdata));

	return 0;
}

static struct dasd_ccw_req *
dasd_eckd_analysis_ccw(struct dasd_device *device)
{
	struct dasd_eckd_private *private;
	struct eckd_count *count_data;
	struct LO_eckd_data *LO_data;
	struct dasd_ccw_req *cqr;
	struct ccw1 *ccw;