ibmvscsi.c

linux-2.6.15.6

			       "ibmvscsi: partner initialization complete\n");

			/* Now login */
			send_srp_login(hostdata);
			break;
		default:
			printk(KERN_ERR "ibmvscsi: unknown crq message type\n");
		}
		return;
	case 0xFF:		/* Hypervisor telling us the connection is closed */
		printk(KERN_INFO "ibmvscsi: Virtual adapter failed!\n");

		atomic_set(&hostdata->request_limit, -1);
		purge_requests(hostdata);
		ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
		return;
	case 0x80:		/* real payload */
		break;
	default:
		printk(KERN_ERR
		       "ibmvscsi: got an invalid message type 0x%02x\n",
		       crq->valid);
		return;
	}

	/* The only kind of payload CRQs we should get are responses to
	 * things we send. Make sure this response is to something we
	 * actually sent
	 */
	if (!valid_event_struct(&hostdata->pool, evt_struct)) {
		printk(KERN_ERR
		       "ibmvscsi: returned correlation_token 0x%p is invalid!\n",
		       (void *)crq->IU_data_ptr);
		return;
	}

	if (atomic_read(&evt_struct->free)) {
		printk(KERN_ERR
		       "ibmvscsi: received duplicate  correlation_token 0x%p!\n",
		       (void *)crq->IU_data_ptr);
		return;
	}

	if (crq->format == VIOSRP_SRP_FORMAT)
		atomic_add(evt_struct->xfer_iu->srp.rsp.request_limit_delta,
			   &hostdata->request_limit);

	if (evt_struct->done)
		evt_struct->done(evt_struct);
	else
		printk(KERN_ERR
		       "ibmvscsi: returned done() is NULL; not running it!\n");

	/*
	 * Lock the host_lock before messing with these structures, since we
	 * are running in a task context
	 */
	spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
	list_del(&evt_struct->list);
	free_event_struct(&evt_struct->hostdata->pool, evt_struct);
	spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
}

/**
 * ibmvscsi_get_host_config: Send the command to the server to get host
 * configuration data.  The data is opaque to us.
 */
static int ibmvscsi_do_host_config(struct ibmvscsi_host_data *hostdata,
				   unsigned char *buffer, int length)
{
	struct viosrp_host_config *host_config;
	struct srp_event_struct *evt_struct;
	int rc;

	evt_struct = get_event_struct(&hostdata->pool);
	if (!evt_struct) {
		printk(KERN_ERR
		       "ibmvscsi: could't allocate event for HOST_CONFIG!\n");
		return -1;
	}

	init_event_struct(evt_struct,
			  sync_completion,
			  VIOSRP_MAD_FORMAT,
			  init_timeout * HZ);

	host_config = &evt_struct->iu.mad.host_config;

	/* Set up a lun reset SRP command */
	memset(host_config, 0x00, sizeof(*host_config));
	host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;
	host_config->common.length = length;
	host_config->buffer = dma_map_single(hostdata->dev, buffer, length,
					    DMA_BIDIRECTIONAL);

	if (dma_mapping_error(host_config->buffer)) {
		printk(KERN_ERR
		       "ibmvscsi: dma_mapping error " "getting host config\n");
		free_event_struct(&hostdata->pool, evt_struct);
		return -1;
	}

	init_completion(&evt_struct->comp);
	rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
	if (rc == 0) {
		wait_for_completion(&evt_struct->comp);
		dma_unmap_single(hostdata->dev, host_config->buffer,
				 length, DMA_BIDIRECTIONAL);
	}

	return rc;
}

/* ------------------------------------------------------------
 * sysfs attributes
 */
static ssize_t show_host_srp_version(struct class_device *class_dev, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(class_dev);
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)shost->hostdata;
	int len;

	len = snprintf(buf, PAGE_SIZE, "%s\n",
		       hostdata->madapter_info.srp_version);
	return len;
}

static struct class_device_attribute ibmvscsi_host_srp_version = {
	.attr = {
		 .name = "srp_version",
		 .mode = S_IRUGO,
		 },
	.show = show_host_srp_version,
};

static ssize_t show_host_partition_name(struct class_device *class_dev,
					char *buf)
{
	struct Scsi_Host *shost = class_to_shost(class_dev);
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)shost->hostdata;
	int len;

	len = snprintf(buf, PAGE_SIZE, "%s\n",
		       hostdata->madapter_info.partition_name);
	return len;
}

static struct class_device_attribute ibmvscsi_host_partition_name = {
	.attr = {
		 .name = "partition_name",
		 .mode = S_IRUGO,
		 },
	.show = show_host_partition_name,
};

static ssize_t show_host_partition_number(struct class_device *class_dev,
					  char *buf)
{
	struct Scsi_Host *shost = class_to_shost(class_dev);
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)shost->hostdata;
	int len;

	len = snprintf(buf, PAGE_SIZE, "%d\n",
		       hostdata->madapter_info.partition_number);
	return len;
}

static struct class_device_attribute ibmvscsi_host_partition_number = {
	.attr = {
		 .name = "partition_number",
		 .mode = S_IRUGO,
		 },
	.show = show_host_partition_number,
};

static ssize_t show_host_mad_version(struct class_device *class_dev, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(class_dev);
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)shost->hostdata;
	int len;

	len = snprintf(buf, PAGE_SIZE, "%d\n",
		       hostdata->madapter_info.mad_version);
	return len;
}

static struct class_device_attribute ibmvscsi_host_mad_version = {
	.attr = {
		 .name = "mad_version",
		 .mode = S_IRUGO,
		 },
	.show = show_host_mad_version,
};

static ssize_t show_host_os_type(struct class_device *class_dev, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(class_dev);
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)shost->hostdata;
	int len;

	len = snprintf(buf, PAGE_SIZE, "%d\n", hostdata->madapter_info.os_type);
	return len;
}

static struct class_device_attribute ibmvscsi_host_os_type = {
	.attr = {
		 .name = "os_type",
		 .mode = S_IRUGO,
		 },
	.show = show_host_os_type,
};

static ssize_t show_host_config(struct class_device *class_dev, char *buf)
{
	struct Scsi_Host *shost = class_to_shost(class_dev);
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)shost->hostdata;

	/* returns null-terminated host config data */
	if (ibmvscsi_do_host_config(hostdata, buf, PAGE_SIZE) == 0)
		return strlen(buf);
	else
		return 0;
}

static struct class_device_attribute ibmvscsi_host_config = {
	.attr = {
		 .name = "config",
		 .mode = S_IRUGO,
		 },
	.show = show_host_config,
};

static struct class_device_attribute *ibmvscsi_attrs[] = {
	&ibmvscsi_host_srp_version,
	&ibmvscsi_host_partition_name,
	&ibmvscsi_host_partition_number,
	&ibmvscsi_host_mad_version,
	&ibmvscsi_host_os_type,
	&ibmvscsi_host_config,
	NULL
};

/* ------------------------------------------------------------
 * SCSI driver registration
 */
static struct scsi_host_template driver_template = {
	.module = THIS_MODULE,
	.name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
	.proc_name = "ibmvscsi",
	.queuecommand = ibmvscsi_queuecommand,
	.eh_abort_handler = ibmvscsi_eh_abort_handler,
	.eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
	.cmd_per_lun = 16,
	.can_queue = 1,		/* Updated after SRP_LOGIN */
	.this_id = -1,
	.sg_tablesize = SG_ALL,
	.use_clustering = ENABLE_CLUSTERING,
	.shost_attrs = ibmvscsi_attrs,
};

/**
 * Called by bus code for each adapter
 */
static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
	struct ibmvscsi_host_data *hostdata;
	struct Scsi_Host *host;
	struct device *dev = &vdev->dev;
	unsigned long wait_switch = 0;

	vdev->dev.driver_data = NULL;

	host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
	if (!host) {
		printk(KERN_ERR "ibmvscsi: couldn't allocate host data\n");
		goto scsi_host_alloc_failed;
	}

	hostdata = (struct ibmvscsi_host_data *)host->hostdata;
	memset(hostdata, 0x00, sizeof(*hostdata));
	INIT_LIST_HEAD(&hostdata->sent);
	hostdata->host = host;
	hostdata->dev = dev;
	atomic_set(&hostdata->request_limit, -1);
	hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */

	if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata,
				    max_requests) != 0) {
		printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n");
		goto init_crq_failed;
	}
	if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) {
		printk(KERN_ERR "ibmvscsi: couldn't initialize event pool\n");
		goto init_pool_failed;
	}

	host->max_lun = 8;
	host->max_id = max_id;
	host->max_channel = max_channel;

	if (scsi_add_host(hostdata->host, hostdata->dev))
		goto add_host_failed;

	/* Try to send an initialization message.  Note that this is allowed
	 * to fail if the other end is not acive.  In that case we don't
	 * want to scan
	 */
	if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) {
		/*
		 * Wait around max init_timeout secs for the adapter to finish
		 * initializing. When we are done initializing, we will have a
		 * valid request_limit.  We don't want Linux scanning before
		 * we are ready.
		 */
		for (wait_switch = jiffies + (init_timeout * HZ);
		     time_before(jiffies, wait_switch) &&
		     atomic_read(&hostdata->request_limit) < 2;) {

			msleep(10);
		}

		/* if we now have a valid request_limit, initiate a scan */
		if (atomic_read(&hostdata->request_limit) > 0)
			scsi_scan_host(host);
	}

	vdev->dev.driver_data = hostdata;
	return 0;

      add_host_failed:
	release_event_pool(&hostdata->pool, hostdata);
      init_pool_failed:
	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_requests);
      init_crq_failed:
	scsi_host_put(host);
      scsi_host_alloc_failed:
	return -1;
}

static int ibmvscsi_remove(struct vio_dev *vdev)
{
	struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data;
	release_event_pool(&hostdata->pool, hostdata);
	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
				   max_requests);
	
	scsi_remove_host(hostdata->host);
	scsi_host_put(hostdata->host);

	return 0;
}

/**
 * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we 
 * support.
 */
static struct vio_device_id ibmvscsi_device_table[] __devinitdata = {
	{"vscsi", "IBM,v-scsi"},
	{ "", "" }
};
MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);

static struct vio_driver ibmvscsi_driver = {
	.id_table = ibmvscsi_device_table,
	.probe = ibmvscsi_probe,
	.remove = ibmvscsi_remove,
	.driver = {
		.name = "ibmvscsi",
		.owner = THIS_MODULE,
	}
};

int __init ibmvscsi_module_init(void)
{
	return vio_register_driver(&ibmvscsi_driver);
}

void __exit ibmvscsi_module_exit(void)
{
	vio_unregister_driver(&ibmvscsi_driver);
}

module_init(ibmvscsi_module_init);
module_exit(ibmvscsi_module_exit);