dasd_eckd.c

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	cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);

	if (IS_ERR(cqr)) {
		DEV_MESSAGE(KERN_WARNING, device, "%s",
			    "Could not allocate RCD request");
		return cqr;
	}

	ccw = cqr->cpaddr;
	ccw->cmd_code = ciw->cmd;
	ccw->cda = (__u32)(addr_t)rcd_buffer;
	ccw->count = ciw->count;

	cqr->device = device;
	cqr->expires = 10*HZ;
	cqr->lpm = lpm;
	clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
	cqr->retries = 2;
	cqr->buildclk = get_clock();
	cqr->status = DASD_CQR_FILLED;
	return cqr;
}

static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
				   void **rcd_buffer,
				   int *rcd_buffer_size, __u8 lpm)
{
	struct ciw *ciw;
	char *rcd_buf = NULL;
	int ret;
	struct dasd_ccw_req *cqr;

	/*
	 * scan for RCD command in extended SenseID data
	 */
	ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
	if (!ciw || ciw->cmd == 0) {
		ret = -EOPNOTSUPP;
		goto out_error;
	}
	rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
	if (!rcd_buf) {
		ret = -ENOMEM;
		goto out_error;
	}
	cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
	if (IS_ERR(cqr)) {
		ret =  PTR_ERR(cqr);
		goto out_error;
	}
	ret = dasd_sleep_on(cqr);
	/*
	 * on success we update the user input parms
	 */
	dasd_sfree_request(cqr, cqr->device);
	if (ret)
		goto out_error;

	*rcd_buffer_size = ciw->count;
	*rcd_buffer = rcd_buf;
	return 0;
out_error:
	kfree(rcd_buf);
	*rcd_buffer = NULL;
	*rcd_buffer_size = 0;
	return ret;
}

static int
dasd_eckd_read_conf(struct dasd_device *device)
{
	void *conf_data;
	int conf_len, conf_data_saved;
	int rc;
	__u8 lpm;
	struct dasd_eckd_private *private;
	struct dasd_eckd_path *path_data;

	private = (struct dasd_eckd_private *) device->private;
	path_data = (struct dasd_eckd_path *) &private->path_data;
	path_data->opm = ccw_device_get_path_mask(device->cdev);
	lpm = 0x80;
	conf_data_saved = 0;

	/* get configuration data per operational path */
	for (lpm = 0x80; lpm; lpm>>= 1) {
		if (lpm & path_data->opm){
			rc = dasd_eckd_read_conf_lpm(device, &conf_data,
						     &conf_len, lpm);
			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");
				continue;	/* no error */
			}
			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));
				kfree(conf_data);
				continue;	/* no error */
			}
			/* save first valid configuration data */
			if (!conf_data_saved){
				memcpy(&private->conf_data, conf_data,
				       sizeof (struct dasd_eckd_confdata));
				conf_data_saved++;
			}
			switch (((char *)conf_data)[242] & 0x07){
			case 0x02:
				path_data->npm |= lpm;
				break;
			case 0x03:
				path_data->ppm |= lpm;
				break;
			}
			kfree(conf_data);
		}
	}
	return 0;
}

/*
 * Build CP for Perform Subsystem Function - SSC.
 */
static struct dasd_ccw_req *
dasd_eckd_build_psf_ssc(struct dasd_device *device)
{
       struct dasd_ccw_req *cqr;
       struct dasd_psf_ssc_data *psf_ssc_data;
       struct ccw1 *ccw;

       cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
				  sizeof(struct dasd_psf_ssc_data),
				  device);

       if (IS_ERR(cqr)) {
	       DEV_MESSAGE(KERN_WARNING, device, "%s",
			   "Could not allocate PSF-SSC request");
	       return cqr;
       }
       psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
       psf_ssc_data->order = PSF_ORDER_SSC;
       psf_ssc_data->suborder = 0x08;

       ccw = cqr->cpaddr;
       ccw->cmd_code = DASD_ECKD_CCW_PSF;
       ccw->cda = (__u32)(addr_t)psf_ssc_data;
       ccw->count = 66;

       cqr->device = device;
       cqr->expires = 10*HZ;
       cqr->buildclk = get_clock();
       cqr->status = DASD_CQR_FILLED;
       return cqr;
}

/*
 * Perform Subsystem Function.
 * It is necessary to trigger CIO for channel revalidation since this
 * call might change behaviour of DASD devices.
 */
static int
dasd_eckd_psf_ssc(struct dasd_device *device)
{
       struct dasd_ccw_req *cqr;
       int rc;

       cqr = dasd_eckd_build_psf_ssc(device);
       if (IS_ERR(cqr))
	       return PTR_ERR(cqr);

       rc = dasd_sleep_on(cqr);
       if (!rc)
	       /* trigger CIO to reprobe devices */
	       css_schedule_reprobe();
       dasd_sfree_request(cqr, cqr->device);
       return rc;
}

/*
 * Valide storage server of current device.
 */
static int
dasd_eckd_validate_server(struct dasd_device *device, struct dasd_uid *uid)
{
	int rc;

	/* Currently PAV is the only reason to 'validate' server on LPAR */
	if (dasd_nopav || MACHINE_IS_VM)
		return 0;

	rc = dasd_eckd_psf_ssc(device);
	/* may be requested feature is not available on server,
	 * therefore just report error and go ahead */
	DEV_MESSAGE(KERN_INFO, device,
		    "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
		    uid->vendor, uid->serial, uid->ssid, rc);
	/* RE-Read Configuration Data */
	return dasd_eckd_read_conf(device);
}

/*
 * Check device characteristics.
 * If the device is accessible using ECKD discipline, the device is enabled.
 */
static int
dasd_eckd_check_characteristics(struct dasd_device *device)
{
	struct dasd_eckd_private *private;
	struct dasd_uid uid;
	void *rdc_data;
	int rc;

	private = (struct dasd_eckd_private *) device->private;
	if (private == NULL) {
		private = kzalloc(sizeof(struct dasd_eckd_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;
	}
	/* 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 Configuration Data */
	rc = dasd_eckd_read_conf(device);
	if (rc)
		return rc;

	/* Generate device unique id and register in devmap */
	rc = dasd_eckd_generate_uid(device, &uid);
	if (rc)
		return rc;
	rc = dasd_set_uid(device->cdev, &uid);
	if (rc == 1)	/* new server found */
		rc = dasd_eckd_validate_server(device, &uid);
	if (rc)
		return rc;

	/* Read Device Characteristics */
	rdc_data = (void *) &(private->rdc_data);
	memset(rdc_data, 0, sizeof(rdc_data));
	rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
	if (rc)
		DEV_MESSAGE(KERN_WARNING, device,
			    "Read device characteristics returned "
			    "rc=%d", 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);
	return rc;
}

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;
	int cplength, datasize;
	int i;

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

	cplength = 8;
	datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
	cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
				   cplength, datasize, device);
	if (IS_ERR(cqr))
		return cqr;
	ccw = cqr->cpaddr;
	/* Define extent for the first 3 tracks. */
	define_extent(ccw++, cqr->data, 0, 2,
		      DASD_ECKD_CCW_READ_COUNT, device);
	LO_data = cqr->data + sizeof (struct DE_eckd_data);
	/* Locate record for the first 4 records on track 0. */
	ccw[-1].flags |= CCW_FLAG_CC;
	locate_record(ccw++, LO_data++, 0, 0, 4,
		      DASD_ECKD_CCW_READ_COUNT, device, 0);

	count_data = private->count_area;
	for (i = 0; i < 4; i++) {
		ccw[-1].flags |= CCW_FLAG_CC;
		ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
		ccw->flags = 0;
		ccw->count = 8;
		ccw->cda = (__u32)(addr_t) count_data;
		ccw++;
		count_data++;
	}

	/* Locate record for the first record on track 2. */
	ccw[-1].flags |= CCW_FLAG_CC;
	locate_record(ccw++, LO_data++, 2, 0, 1,
		      DASD_ECKD_CCW_READ_COUNT, device, 0);
	/* Read count ccw. */
	ccw[-1].flags |= CCW_FLAG_CC;
	ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
	ccw->flags = 0;
	ccw->count = 8;
	ccw->cda = (__u32)(addr_t) count_data;

	cqr->device = device;
	cqr->retries = 0;
	cqr->buildclk = get_clock();
	cqr->status = DASD_CQR_FILLED;
	return cqr;
}

/*
 * This is the callback function for the init_analysis cqr. It saves
 * the status of the initial analysis ccw before it frees it and kicks
 * the device to continue the startup sequence. This will call
 * dasd_eckd_do_analysis again (if the devices has not been marked
 * for deletion in the meantime).
 */
static void
dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
{
	struct dasd_eckd_private *private;
	struct dasd_device *device;

	device = init_cqr->device;
	private = (struct dasd_eckd_private *) device->private;
	private->init_cqr_status = init_cqr->status;
	dasd_sfree_request(init_cqr, device);
	dasd_kick_device(device);
}

static int
dasd_eckd_start_analysis(struct dasd_device *device)
{
	struct dasd_eckd_private *private;
	struct dasd_ccw_req *init_cqr;

	private = (struct dasd_eckd_private *) device->private;
	init_cqr = dasd_eckd_analysis_ccw(device);
	if (IS_ERR(init_cqr))
		return PTR_ERR(init_cqr);
	init_cqr->callback = dasd_eckd_analysis_callback;
	init_cqr->callback_data = NULL;
	init_cqr->expires = 5*HZ;
	dasd_add_request_head(init_cqr);
	return -EAGAIN;
}

static int
dasd_eckd_end_analysis(struct dasd_device *device)
{
	struct dasd_eckd_private *private;
	struct eckd_count *count_area;
	unsigned int sb, blk_per_trk;
	int status, i;

	private = (struct dasd_eckd_private *) device->private;
	status = private->init_cqr_status;
	private->init_cqr_status = -1;
	if (status != DASD_CQR_DONE) {
		DEV_MESSAGE(KERN_WARNING, device, "%s",
			    "volume analysis returned unformatted disk");
		return -EMEDIUMTYPE;
	}

	private->uses_cdl = 1;
	/* Calculate number of blocks/records per track. */
	blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
	/* Check Track 0 for Compatible Disk Layout */
	count_area = NULL;
	for (i = 0; i < 3; i++) {
		if (private->count_area[i].kl != 4 ||
		    private->count_area[i].dl != dasd_eckd_cdl_reclen(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 && count_area->kl == 0) {
		/* we found notthing violating our disk layout */
		if (dasd_check_blocksize(count_area->dl) == 0)
			device->bp_block = count_area->dl;
	}
	if (device->bp_block == 0) {
		DEV_MESSAGE(KERN_WARNING, device, "%s",
			    "Volume has incompatible disk layout");
		return -EMEDIUMTYPE;
	}
	device->s2b_shift = 0;	/* bits to shift 512 to get a block */
	for (sb = 512; sb < device->bp_block; sb = sb << 1)
		device->s2b_shift++;

	blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
	device->blocks = (private->rdc_data.no_cyl *
			  private->rdc_data.trk_per_cyl *
			  blk_per_trk);

	DEV_MESSAGE(KERN_INFO, device,
		    "(%dkB blks): %dkB at %dkB/trk %s",
		    (device->bp_block >> 10),
		    ((private->rdc_data.no_cyl *
		      private->rdc_data.trk_per_cyl *
		      blk_per_trk * (device->bp_block >> 9)) >> 1),
		    ((blk_per_trk * device->bp_block) >> 10),
		    private->uses_cdl ?
		    "compatible disk layout" : "linux disk layout");

	return 0;
}

static int
dasd_eckd_do_analysis(struct dasd_device *device)
{
	struct dasd_eckd_private *private;

	private = (struct dasd_eckd_private *) device->private;
	if (private->init_cqr_status < 0)
		return dasd_eckd_start_analysis(device);
	else