sbp2.c

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			goto failed_alloc;
		}
		SBP2_DEBUG("sbp2_alloc_device: allocated hostinfo");
		hi->host = ud->ne->host;
		INIT_LIST_HEAD(&hi->scsi_ids);

#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
		/* Handle data movement if physical dma is not
		 * enabled or not supported on host controller */
		if (!hpsb_register_addrspace(&sbp2_highlevel, ud->ne->host,
					     &sbp2_physdma_ops,
					     0x0ULL, 0xfffffffcULL)) {
			SBP2_ERR("failed to register lower 4GB address range");
			goto failed_alloc;
		}
#endif
	}

	/* Prevent unloading of the 1394 host */
	if (!try_module_get(hi->host->driver->owner)) {
		SBP2_ERR("failed to get a reference on 1394 host driver");
		goto failed_alloc;
	}

	scsi_id->hi = hi;

	list_add_tail(&scsi_id->scsi_list, &hi->scsi_ids);

	/* Register the status FIFO address range. We could use the same FIFO
	 * for targets at different nodes. However we need different FIFOs per
	 * target in order to support multi-unit devices.
	 * The FIFO is located out of the local host controller's physical range
	 * but, if possible, within the posted write area. Status writes will
	 * then be performed as unified transactions. This slightly reduces
	 * bandwidth usage, and some Prolific based devices seem to require it.
	 */
	scsi_id->status_fifo_addr = hpsb_allocate_and_register_addrspace(
			&sbp2_highlevel, ud->ne->host, &sbp2_ops,
			sizeof(struct sbp2_status_block), sizeof(quadlet_t),
			ud->ne->host->low_addr_space, CSR1212_ALL_SPACE_END);
	if (scsi_id->status_fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
		SBP2_ERR("failed to allocate status FIFO address range");
		goto failed_alloc;
	}

	/* Register our host with the SCSI stack. */
	scsi_host = scsi_host_alloc(&scsi_driver_template,
				    sizeof(unsigned long));
	if (!scsi_host) {
		SBP2_ERR("failed to register scsi host");
		goto failed_alloc;
	}

	scsi_host->hostdata[0] = (unsigned long)scsi_id;

	if (!scsi_add_host(scsi_host, &ud->device)) {
		scsi_id->scsi_host = scsi_host;
		return scsi_id;
	}

	SBP2_ERR("failed to add scsi host");
	scsi_host_put(scsi_host);

failed_alloc:
	sbp2_remove_device(scsi_id);
	return NULL;
}

static void sbp2_host_reset(struct hpsb_host *host)
{
	struct sbp2scsi_host_info *hi;
	struct scsi_id_instance_data *scsi_id;

	hi = hpsb_get_hostinfo(&sbp2_highlevel, host);
	if (!hi)
		return;
	list_for_each_entry(scsi_id, &hi->scsi_ids, scsi_list)
		if (likely(atomic_read(&scsi_id->state) !=
			   SBP2LU_STATE_IN_SHUTDOWN)) {
			atomic_set(&scsi_id->state, SBP2LU_STATE_IN_RESET);
			scsi_block_requests(scsi_id->scsi_host);
		}
}

/*
 * This function is where we first pull the node unique ids, and then
 * allocate memory and register a SBP-2 device.
 */
static int sbp2_start_device(struct scsi_id_instance_data *scsi_id)
{
	struct sbp2scsi_host_info *hi = scsi_id->hi;
	int error;

	SBP2_DEBUG_ENTER();

	/* Login FIFO DMA */
	scsi_id->login_response =
		pci_alloc_consistent(hi->host->pdev,
				     sizeof(struct sbp2_login_response),
				     &scsi_id->login_response_dma);
	if (!scsi_id->login_response)
		goto alloc_fail;
	SBP2_DMA_ALLOC("consistent DMA region for login FIFO");

	/* Query logins ORB DMA */
	scsi_id->query_logins_orb =
		pci_alloc_consistent(hi->host->pdev,
				     sizeof(struct sbp2_query_logins_orb),
				     &scsi_id->query_logins_orb_dma);
	if (!scsi_id->query_logins_orb)
		goto alloc_fail;
	SBP2_DMA_ALLOC("consistent DMA region for query logins ORB");

	/* Query logins response DMA */
	scsi_id->query_logins_response =
		pci_alloc_consistent(hi->host->pdev,
				     sizeof(struct sbp2_query_logins_response),
				     &scsi_id->query_logins_response_dma);
	if (!scsi_id->query_logins_response)
		goto alloc_fail;
	SBP2_DMA_ALLOC("consistent DMA region for query logins response");

	/* Reconnect ORB DMA */
	scsi_id->reconnect_orb =
		pci_alloc_consistent(hi->host->pdev,
				     sizeof(struct sbp2_reconnect_orb),
				     &scsi_id->reconnect_orb_dma);
	if (!scsi_id->reconnect_orb)
		goto alloc_fail;
	SBP2_DMA_ALLOC("consistent DMA region for reconnect ORB");

	/* Logout ORB DMA */
	scsi_id->logout_orb =
		pci_alloc_consistent(hi->host->pdev,
				     sizeof(struct sbp2_logout_orb),
				     &scsi_id->logout_orb_dma);
	if (!scsi_id->logout_orb)
		goto alloc_fail;
	SBP2_DMA_ALLOC("consistent DMA region for logout ORB");

	/* Login ORB DMA */
	scsi_id->login_orb =
		pci_alloc_consistent(hi->host->pdev,
				     sizeof(struct sbp2_login_orb),
				     &scsi_id->login_orb_dma);
	if (!scsi_id->login_orb)
		goto alloc_fail;
	SBP2_DMA_ALLOC("consistent DMA region for login ORB");

	SBP2_DEBUG("New SBP-2 device inserted, SCSI ID = %x", scsi_id->ud->id);

	/*
	 * Create our command orb pool
	 */
	if (sbp2util_create_command_orb_pool(scsi_id)) {
		SBP2_ERR("sbp2util_create_command_orb_pool failed!");
		sbp2_remove_device(scsi_id);
		return -ENOMEM;
	}

	/* Schedule a timeout here. The reason is that we may be so close
	 * to a bus reset, that the device is not available for logins.
	 * This can happen when the bus reset is caused by the host
	 * connected to the sbp2 device being removed. That host would
	 * have a certain amount of time to relogin before the sbp2 device
	 * allows someone else to login instead. One second makes sense. */
	if (msleep_interruptible(1000)) {
		sbp2_remove_device(scsi_id);
		return -EINTR;
	}

	/*
	 * Login to the sbp-2 device
	 */
	if (sbp2_login_device(scsi_id)) {
		/* Login failed, just remove the device. */
		sbp2_remove_device(scsi_id);
		return -EBUSY;
	}

	/*
	 * Set max retries to something large on the device
	 */
	sbp2_set_busy_timeout(scsi_id);

	/*
	 * Do a SBP-2 fetch agent reset
	 */
	sbp2_agent_reset(scsi_id, 1);

	/*
	 * Get the max speed and packet size that we can use
	 */
	sbp2_max_speed_and_size(scsi_id);

	/* Add this device to the scsi layer now */
	error = scsi_add_device(scsi_id->scsi_host, 0, scsi_id->ud->id, 0);
	if (error) {
		SBP2_ERR("scsi_add_device failed");
		sbp2_logout_device(scsi_id);
		sbp2_remove_device(scsi_id);
		return error;
	}

	return 0;

alloc_fail:
	SBP2_ERR("Could not allocate memory for scsi_id");
	sbp2_remove_device(scsi_id);
	return -ENOMEM;
}

/*
 * This function removes an sbp2 device from the sbp2scsi_host_info struct.
 */
static void sbp2_remove_device(struct scsi_id_instance_data *scsi_id)
{
	struct sbp2scsi_host_info *hi;

	SBP2_DEBUG_ENTER();

	if (!scsi_id)
		return;

	hi = scsi_id->hi;

	/* This will remove our scsi device aswell */
	if (scsi_id->scsi_host) {
		scsi_remove_host(scsi_id->scsi_host);
		scsi_host_put(scsi_id->scsi_host);
	}
	flush_scheduled_work();
	sbp2util_remove_command_orb_pool(scsi_id);

	list_del(&scsi_id->scsi_list);

	if (scsi_id->login_response) {
		pci_free_consistent(hi->host->pdev,
				    sizeof(struct sbp2_login_response),
				    scsi_id->login_response,
				    scsi_id->login_response_dma);
		SBP2_DMA_FREE("single login FIFO");
	}

	if (scsi_id->login_orb) {
		pci_free_consistent(hi->host->pdev,
				    sizeof(struct sbp2_login_orb),
				    scsi_id->login_orb,
				    scsi_id->login_orb_dma);
		SBP2_DMA_FREE("single login ORB");
	}

	if (scsi_id->reconnect_orb) {
		pci_free_consistent(hi->host->pdev,
				    sizeof(struct sbp2_reconnect_orb),
				    scsi_id->reconnect_orb,
				    scsi_id->reconnect_orb_dma);
		SBP2_DMA_FREE("single reconnect orb");
	}

	if (scsi_id->logout_orb) {
		pci_free_consistent(hi->host->pdev,
				    sizeof(struct sbp2_logout_orb),
				    scsi_id->logout_orb,
				    scsi_id->logout_orb_dma);
		SBP2_DMA_FREE("single logout orb");
	}

	if (scsi_id->query_logins_orb) {
		pci_free_consistent(hi->host->pdev,
				    sizeof(struct sbp2_query_logins_orb),
				    scsi_id->query_logins_orb,
				    scsi_id->query_logins_orb_dma);
		SBP2_DMA_FREE("single query logins orb");
	}

	if (scsi_id->query_logins_response) {
		pci_free_consistent(hi->host->pdev,
				    sizeof(struct sbp2_query_logins_response),
				    scsi_id->query_logins_response,
				    scsi_id->query_logins_response_dma);
		SBP2_DMA_FREE("single query logins data");
	}

	if (scsi_id->status_fifo_addr != CSR1212_INVALID_ADDR_SPACE)
		hpsb_unregister_addrspace(&sbp2_highlevel, hi->host,
					  scsi_id->status_fifo_addr);

	scsi_id->ud->device.driver_data = NULL;

	if (hi)
		module_put(hi->host->driver->owner);

	SBP2_DEBUG("SBP-2 device removed, SCSI ID = %d", scsi_id->ud->id);

	kfree(scsi_id);
}

#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
/*
 * This function deals with physical dma write requests (for adapters that do not support
 * physical dma in hardware). Mostly just here for debugging...
 */
static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid,
				     int destid, quadlet_t *data, u64 addr,
				     size_t length, u16 flags)
{

	/*
	 * Manually put the data in the right place.
	 */
	memcpy(bus_to_virt((u32) addr), data, length);
	sbp2util_packet_dump(data, length, "sbp2 phys dma write by device",
			     (u32) addr);
	return RCODE_COMPLETE;
}

/*
 * This function deals with physical dma read requests (for adapters that do not support
 * physical dma in hardware). Mostly just here for debugging...
 */
static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid,
				    quadlet_t *data, u64 addr, size_t length,
				    u16 flags)
{

	/*
	 * Grab data from memory and send a read response.
	 */
	memcpy(data, bus_to_virt((u32) addr), length);
	sbp2util_packet_dump(data, length, "sbp2 phys dma read by device",
			     (u32) addr);
	return RCODE_COMPLETE;
}
#endif

/**************************************
 * SBP-2 protocol related section
 **************************************/

/*
 * This function queries the device for the maximum concurrent logins it
 * supports.
 */
static int sbp2_query_logins(struct scsi_id_instance_data *scsi_id)
{
	struct sbp2scsi_host_info *hi = scsi_id->hi;
	quadlet_t data[2];
	int max_logins;
	int active_logins;

	SBP2_DEBUG_ENTER();

	scsi_id->query_logins_orb->reserved1 = 0x0;
	scsi_id->query_logins_orb->reserved2 = 0x0;

	scsi_id->query_logins_orb->query_response_lo = scsi_id->query_logins_response_dma;
	scsi_id->query_logins_orb->query_response_hi = ORB_SET_NODE_ID(hi->host->node_id);

	scsi_id->query_logins_orb->lun_misc = ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST);
	scsi_id->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1);
	scsi_id->query_logins_orb->lun_misc |= ORB_SET_LUN(scsi_id->sbp2_lun);

	scsi_id->query_logins_orb->reserved_resp_length =
		ORB_SET_QUERY_LOGINS_RESP_LENGTH(sizeof(struct sbp2_query_logins_response));

	scsi_id->query_logins_orb->status_fifo_hi =
		ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id);
	scsi_id->query_logins_orb->status_fifo_lo =
		ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr);

	sbp2util_cpu_to_be32_buffer(scsi_id->query_logins_orb, sizeof(struct sbp2_query_logins_orb));

	sbp2util_packet_dump(scsi_id->query_logins_orb, sizeof(struct sbp2_query_logins_orb),
			     "sbp2 query logins orb", scsi_id->query_logins_orb_dma);

	memset(scsi_id->query_logins_response, 0, sizeof(struct sbp2_query_logins_response));

	data[0] = ORB_SET_NODE_ID(hi->host->node_id);
	data[1] = scsi_id->query_logins_orb_dma;
	sbp2util_cpu_to_be32_buffer(data, 8);

	hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8);

	if (sbp2util_access_timeout(scsi_id, 2*HZ)) {
		SBP2_INFO("Error querying logins to SBP-2 device - timed out");
		return -EIO;
	}

	if (scsi_id->status_block.ORB_offset_lo != scsi_id->query_logins_orb_dma) {
		SBP2_INFO("Error querying logins to SBP-2 device - timed out");
		return -EIO;
	}

	if (STATUS_TEST_RDS(scsi_id->status_block.ORB_offset_hi_misc)) {
		SBP2_INFO("Error querying logins to SBP-2 device - failed");
		return -EIO;
	}

	sbp2util_cpu_to_be32_buffer(scsi_id->query_logins_response, sizeof(struct sbp2_query_logins_response));

	SBP2_DEBUG("length_max_logins = %x",
		   (unsigned int)scsi_id->query_logins_response->length_max_logins);

	max_logins = RESPONSE_GET_MAX_LOGINS(scsi_id->query_logins_response->length_max_logins);
	SBP2_INFO("Maximum concurrent logins supported: %d", max_logins);

	active_logins = RESPONSE_GET_ACTIVE_LOGINS(scsi_id->query_logins_response->length_max_logins);
	SBP2_INFO("Number of active logins: %d", active_logins);

	if (active_logins >= max_logins) {
		return -EIO;
	}

	return 0;
}

/*
 * This function is called in order to login to a particular SBP-2 device,
 * after a bus reset.
 */
static int sbp2_login_device(struct scsi_id_instance_data *scsi_id)
{
	struct sbp2scsi_host_info *hi = scsi_id->hi;
	quadlet_t data[2];

	SBP2_DEBUG_ENTER();