dasd_eckd.c

来自「linux-2.4.29操作系统的源码」· C语言 代码 · 共 1,885 行 · 第 1/4 页

{
	if (info->sid_data.cu_type == 0x3990 ||
	    info->sid_data.cu_type == 0x2105)
		    if (info->sid_data.dev_type == 0x3390) return 0;
	if (info->sid_data.cu_type == 0x3990 ||
	    info->sid_data.cu_type == 0x2105)
		    if (info->sid_data.dev_type == 0x3380) return 0;
	if (info->sid_data.cu_type == 0x9343)
		if (info->sid_data.dev_type == 0x9345)
			return 0;
	return -ENODEV;
}

static int
dasd_eckd_check_characteristics (struct dasd_device_t *device)
{
	int   rc = 0;
	void *conf_data;
        void *rdc_data;
	int   conf_len;
	dasd_eckd_private_t *private;

	if (device == NULL) {

		MESSAGE (KERN_WARNING, "%s",
                         "Null device pointer passed to characteristics "
                         "checker");

                return -ENODEV;
	}
	device->private = kmalloc (sizeof (dasd_eckd_private_t), 
                                   GFP_KERNEL);

	if (device->private == NULL) {

		MESSAGE (KERN_WARNING, "%s",
			"memory allocation failed for private data");

		rc = -ENOMEM;
                goto fail;
	}

	private  = (dasd_eckd_private_t *) device->private;
	rdc_data = (void *) &(private->rdc_data);

        /* Read Device Characteristics */
	rc = read_dev_chars (device->devinfo.irq, 
                             &rdc_data, 
                             64);
	if (rc) {

		MESSAGE (KERN_WARNING,
			"Read device characteristics returned error %d",
                         rc);

                goto fail;
        }

        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);

        /* set default cache operations */
        private->attrib.operation = DASD_NORMAL_CACHE;
        private->attrib.nr_cyl    = 0;
        
        /* Read Configuration Data */
        rc = read_conf_data (device->devinfo.irq, 
                             &conf_data, 
                             &conf_len,
                             LPM_ANYPATH);

        if (rc == -EOPNOTSUPP) {
                rc = 0; /* this one is ok */
        }
	if (rc) {

		MESSAGE (KERN_WARNING,
                         "Read configuration data returned error %d",
                         rc);

                goto fail;
	}
        if (conf_data == NULL) {

		MESSAGE (KERN_WARNING, "%s",
                         "No configuration data retrieved");

                goto out; /* no errror */
	} 
        if (conf_len != sizeof (dasd_eckd_confdata_t)) {

		MESSAGE (KERN_WARNING,
                         "sizes of configuration data mismatch"
                         "%d (read) vs %ld (expected)",
                         conf_len, 
                         sizeof (dasd_eckd_confdata_t));

                goto out; /* no errror */
	} 
        memcpy (&private->conf_data, conf_data, 
                sizeof (dasd_eckd_confdata_t));

        DEV_MESSAGE (KERN_INFO, device,
                "%04X/%02X(CU:%04X/%02X): Configuration data read",
                private->rdc_data.dev_type, 
                private->rdc_data.dev_model,
                private->rdc_data.cu_type, 
                private->rdc_data.cu_model.model);
        goto out;

 fail:
        if (device->private) {
                kfree (device->private);
                device->private = NULL;
        }
        
 out:
	return rc;
}

static inline int
dasd_eckd_cdl_reclen (dasd_device_t * device, int recid)
{
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	int byt_per_blk = device->sizes.bp_block;
	int blk_per_trk = recs_per_track (&(private->rdc_data), 0, byt_per_blk);
	if (recid < 3)
		return sizes_trk0[recid];
	if (recid < blk_per_trk)
		return byt_per_blk;
	if (recid < 2 * blk_per_trk)
		return LABEL_SIZE;
	return byt_per_blk;
}

static ccw_req_t *
dasd_eckd_init_analysis (struct dasd_device_t *device)
{
	ccw_req_t *cqr = NULL;
	ccw1_t *ccw;
	DE_eckd_data_t *DE_data;
	LO_eckd_data_t *LO_data;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *)device->private;
	eckd_count_t *count_data = private->count_area;

	cqr = dasd_alloc_request (dasd_eckd_discipline.name, 8 + 1,
				 sizeof (DE_eckd_data_t) +
				 2 * sizeof (LO_eckd_data_t),
                                 device);
	if (cqr == NULL) {

                MESSAGE (KERN_WARNING, "%s",
                        "No memory to allocate initialization request");
                goto out;
	}
	DE_data = cqr->data;
	LO_data = cqr->data + sizeof (DE_eckd_data_t);
	ccw = cqr->cpaddr;
	if (define_extent (ccw, DE_data, 0, 2, DASD_ECKD_CCW_READ_COUNT, device, cqr)) {
                goto clear_cqr;
        }        
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	if (locate_record (ccw, LO_data++, 0, 0, 4, DASD_ECKD_CCW_READ_COUNT,
                           device, 0, cqr)) {
                goto clear_cqr;
        }       
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->count = 8;
	if (dasd_set_normalized_cda (ccw, __pa (count_data++), cqr, device)) {
                goto clear_cqr;
        }
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->count = 8;
	if (dasd_set_normalized_cda (ccw, __pa (count_data++), cqr, device)) {
                goto clear_cqr;
        }
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->count = 8;
	if (dasd_set_normalized_cda (ccw, __pa (count_data++), cqr, device)) {
                goto clear_cqr;
        }
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->count = 8;
	if (dasd_set_normalized_cda (ccw, __pa (count_data++), cqr, device)) {
                goto clear_cqr;
        }
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	if (locate_record (ccw, LO_data++, 2, 0, 1, DASD_ECKD_CCW_READ_COUNT,
                           device, 0, cqr)) {
                goto clear_cqr;
        }       
	ccw->flags |= CCW_FLAG_CC;
	ccw++;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->count = 8;
	if (dasd_set_normalized_cda (ccw, __pa (count_data), cqr, device)) {
                goto clear_cqr;
        }
	cqr->device = device;
	cqr->retries = 0;
        cqr->buildclk = get_clock ();
	cqr->status = CQR_STATUS_FILLED;
        dasd_chanq_enq (&device->queue, cqr);
        goto out;

 clear_cqr:
        dasd_free_request (cqr,device);

        MESSAGE (KERN_WARNING, "%s",
                "No memory to allocate initialization request");

        cqr=NULL;
 out:
	return cqr;
}

static int
dasd_eckd_do_analysis (struct dasd_device_t *device)
{
	int sb, rpt;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	eckd_count_t *count_area = NULL;
	char *cdl_msg;
        int status;
	int i;

	private->uses_cdl = 1;
        status = device->init_cqr->status;
	dasd_chanq_deq (&device->queue, device->init_cqr);
	dasd_free_request (device->init_cqr, device);
	/* Free the cqr and cleanup device->sizes */
        if ( status != CQR_STATUS_DONE ) {

                DEV_MESSAGE (KERN_WARNING, device, "%s",
                             "volume analysis returned unformatted disk");

                return -EMEDIUMTYPE;
        }
	/* Check Track 0 for Compatible Disk Layout */
	for (i = 0; i < 3; i++) {
		if ((i < 3) &&
		    ((private->count_area[i].kl != 4) ||
		     (private->count_area[i].dl !=
		      dasd_eckd_cdl_reclen (device, i) - 4))) {
			private->uses_cdl = 0;
			break;
		}
	}
	if (i == 3) {
		count_area = &private->count_area[4];
	}
	if (private->uses_cdl == 0) {
		for (i = 0; i < 5; i++) {
			if ((private->count_area[i].kl != 0) ||
			    (private->count_area[i].dl !=
			     private->count_area[0].dl)) {
				break;
			}
		}
		if (i == 5) {
			count_area = &private->count_area[0];
		}
	} else {
		if (private->count_area[3].record == 1) {

			DEV_MESSAGE (KERN_WARNING, device, "%s",
                                     "Trk 0: no records after VTOC!");
		}
	}
	if (count_area != NULL &&	/* we found notthing violating our disk layout */
	    count_area->kl == 0) {
                /* find out blocksize */
                switch (count_area->dl) {
                case 512:
		case 1024:
		case 2048:
		case 4096:
			device->sizes.bp_block = count_area->dl;
			break;
		}
	}
	if (device->sizes.bp_block == 0) {

		DEV_MESSAGE (KERN_WARNING, device, "%s",
                             "Volume has incompatible disk layout");

		return -EMEDIUMTYPE;
	}
	device->sizes.s2b_shift = 0;	/* bits to shift 512 to get a block */
	device->sizes.pt_block = 2;
	for (sb = 512; sb < device->sizes.bp_block; sb = sb << 1)
		device->sizes.s2b_shift++;

	rpt = recs_per_track (&private->rdc_data, 0, device->sizes.bp_block);
	device->sizes.blocks = (private->rdc_data.no_cyl *
				private->rdc_data.trk_per_cyl *
				recs_per_track (&private->rdc_data, 0,
						device->sizes.bp_block));
	cdl_msg =
	    private->
	    uses_cdl ? "compatible disk layout" : "linux disk layout";

	DEV_MESSAGE (KERN_INFO, device, 
                     "(%dkB blks): %dkB at %dkB/trk %s",
                     (device->sizes.bp_block >> 10),
                     ((private->rdc_data.no_cyl *
                       private->rdc_data.trk_per_cyl *
                       recs_per_track (&private->rdc_data, 0,
                                       device->sizes.bp_block) *
                       (device->sizes.bp_block >> 9)) >> 1),
                     ((recs_per_track (&private->rdc_data, 0,
                                       device->sizes.bp_block) *
                       device->sizes.bp_block) >> 10),
                     cdl_msg);

	return 0;
}

static int
dasd_eckd_fill_geometry (struct dasd_device_t *device, struct hd_geometry *geo)
{
	int rc = 0;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;
	switch (device->sizes.bp_block) {
	case 512:
	case 1024:
	case 2048:
	case 4096:
            geo->sectors = recs_per_track (&(private->rdc_data), 
                                           0, device->sizes.bp_block);
            break;
	default:
            break;
	}
	geo->cylinders = private->rdc_data.no_cyl;
	geo->heads = private->rdc_data.trk_per_cyl;
	return rc;
}

static ccw_req_t *
dasd_eckd_format_device (dasd_device_t * device, format_data_t * fdata)
{
	int i;
	ccw_req_t *fcp = NULL;
	DE_eckd_data_t *DE_data = NULL;
	LO_eckd_data_t *LO_data = NULL;
	eckd_count_t *ct_data = NULL;
	eckd_count_t *r0_data = NULL;
	eckd_home_t *ha_data = NULL;
	ccw1_t *last_ccw = NULL;
	void *last_data = NULL;
	dasd_eckd_private_t *private = (dasd_eckd_private_t *) device->private;

	int rpt = recs_per_track (&(private->rdc_data), 0, fdata->blksize);
	int cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
	int head = fdata->start_unit % private->rdc_data.trk_per_cyl;
	int wrccws = rpt;
	int datasize = sizeof (DE_eckd_data_t) + sizeof (LO_eckd_data_t);
        
	if (fdata->start_unit >= 
            (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)){

                DEV_MESSAGE (KERN_INFO, device, 
                             "Track no %d too big!", 
                             fdata->start_unit);

                return NULL;
        }
        if ( fdata->start_unit > fdata->stop_unit) {

                DEV_MESSAGE (KERN_INFO, device, 
                             "Track %d reached! ending.",
                             fdata->start_unit);

		return NULL;
	}
	switch (fdata->blksize) {
	case 512:
	case 1024:
	case 2048:
	case 4096:
		break;
	default:

		MESSAGE (KERN_WARNING,
                         "Invalid blocksize %d...terminating!", 
                         fdata->blksize);

		return NULL;
	}
	switch (fdata->intensity) {
	case 0x00:
	case 0x01:
	case 0x03:
	case 0x04:		/* make track invalid */
	case 0x08:
	case 0x09:
	case 0x0b:
	case 0x0c:
		break;
	default:

		MESSAGE (KERN_WARNING,
                         "Invalid flags 0x%x...terminating!", 
                         fdata->intensity);

		return NULL;
	}

	/* print status line */
	if ((private->rdc_data.no_cyl < 20) ?
	    (fdata->start_unit % private->rdc_data.no_cyl == 0) :
	    (fdata->start_unit % private->rdc_data.no_cyl == 0 &&
	     (fdata->start_unit / private->rdc_data.no_cyl) %
	     (private->rdc_data.no_cyl / 20))) {

		DBF_DEV_EVENT (DBF_NOTICE, device,
                               "Format Cylinder: %d Flags: %d",
                               fdata->start_unit / private->rdc_data.trk_per_cyl,
                               fdata->intensity);

	}
	if ((fdata->intensity & ~0x8) & 0x04) {
		wrccws = 1;
		rpt = 1;
	} else {
		if (fdata->intensity & 0x1) {
			wrccws++;
			datasize += sizeof (eckd_count_t);
		}
		if (fdata->intensity & 0x2) {
			wrccws++;
			datasize += sizeof (eckd_home_t);
		}
	}
	fcp = dasd_alloc_request (dasd_eckd_discipline.name,
				 wrccws + 2 + 1,
				 datasize + rpt * sizeof (eckd_count_t),
                                 device );
	if (fcp != NULL) {
		fcp->device = device;
		fcp->retries = 2;	/* set retry counter to enable ERP */
		last_data = fcp->data;
		DE_data = (DE_eckd_data_t *) last_data;
		last_data = (void *) (DE_data + 1);
		LO_data = (LO_eckd_data_t *) last_data;
		last_data = (void *) (LO_data + 1);
		if (fdata->intensity & 0x2) {
			ha_data = (eckd_home_t *) last_data;
			last_data = (void *) (ha_data + 1);
		}
		if (fdata->intensity & 0x1) {
			r0_data = (eckd_count_t *) last_data;
			last_data = (void *) (r0_data + 1);
		}