static int adf_probe()

in qat/qat_c3xxx/adf_drv.c [73:232]

• 122 lines of code
• 20 McCabe index (conditional complexity)

static int adf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct adf_accel_dev *accel_dev;
	struct adf_accel_pci *accel_pci_dev;
	struct adf_hw_device_data *hw_data;
	char name[ADF_DEVICE_NAME_LENGTH];
	unsigned int i, bar_nr;
	unsigned long bar_mask;
	int ret;

	switch (ent->device) {
	case PCI_DEVICE_ID_INTEL_QAT_C3XXX:
		break;
	default:
		dev_err(&pdev->dev, "Invalid device 0x%x.\n", ent->device);
		return -ENODEV;
	}

	if (num_possible_nodes() > 1 && dev_to_node(&pdev->dev) < 0) {
		/* If the accelerator is connected to a node with no memory
		 * there is no point in using the accelerator since the remote
		 * memory transaction will be very slow. */
		dev_err(&pdev->dev, "Invalid NUMA configuration.\n");
		return -EINVAL;
	}

	accel_dev = kzalloc_node(sizeof(*accel_dev), GFP_KERNEL,
				 dev_to_node(&pdev->dev));
	if (!accel_dev)
		return -ENOMEM;

	INIT_LIST_HEAD(&accel_dev->crypto_list);
	accel_pci_dev = &accel_dev->accel_pci_dev;
	accel_pci_dev->pci_dev = pdev;

	/* Add accel device to accel table.
	 * This should be called before adf_cleanup_accel is called */
	if (adf_devmgr_add_dev(accel_dev, NULL)) {
		dev_err(&pdev->dev, "Failed to add new accelerator device.\n");
		kfree(accel_dev);
		return -EFAULT;
	}

	accel_dev->owner = THIS_MODULE;
	/* Allocate and configure device configuration structure */
	hw_data = kzalloc_node(sizeof(*hw_data), GFP_KERNEL,
			       dev_to_node(&pdev->dev));
	if (!hw_data) {
		ret = -ENOMEM;
		goto out_err;
	}

	accel_dev->hw_device = hw_data;
	adf_init_hw_data_c3xxx(accel_dev->hw_device);
	pci_read_config_byte(pdev, PCI_REVISION_ID, &accel_pci_dev->revid);
	pci_read_config_dword(pdev, ADF_DEVICE_FUSECTL_OFFSET,
			      &hw_data->fuses);
	pci_read_config_dword(pdev, ADF_C3XXX_SOFTSTRAP_CSR_OFFSET,
			      &hw_data->straps);

	/* Get Accelerators and Accelerators Engines masks */
	hw_data->accel_mask = hw_data->get_accel_mask(hw_data);
	hw_data->ae_mask = hw_data->get_ae_mask(hw_data);
	accel_pci_dev->sku = hw_data->get_sku(hw_data);
	/* If the device has no acceleration engines then ignore it. */
	if (!hw_data->accel_mask || !hw_data->ae_mask ||
	    ((~hw_data->ae_mask) & 0x01)) {
		dev_err(&pdev->dev, "No acceleration units found");
		ret = -EFAULT;
		goto out_err;
	}

	/* Create dev top level debugfs entry */
	snprintf(name, sizeof(name), "%s%s_%s", ADF_DEVICE_NAME_PREFIX,
		 hw_data->dev_class->name, pci_name(pdev));

	accel_dev->debugfs_dir = debugfs_create_dir(name, NULL);

	/* Create device configuration table */
	ret = adf_cfg_dev_add(accel_dev);
	if (ret)
		goto out_err;

	/* enable PCI device */
	if (pci_enable_device(pdev)) {
		ret = -EFAULT;
		goto out_err;
	}

	/* set dma identifier */
	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48));
	if (ret) {
		dev_err(&pdev->dev, "No usable DMA configuration\n");
		goto out_err_disable;
	}

	if (pci_request_regions(pdev, ADF_C3XXX_DEVICE_NAME)) {
		ret = -EFAULT;
		goto out_err_disable;
	}

	/* Get accelerator capabilities mask */
	hw_data->accel_capabilities_mask = hw_data->get_accel_cap(accel_dev);

	/* Find and map all the device's BARS */
	i = 0;
	bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
	for_each_set_bit(bar_nr, &bar_mask, ADF_PCI_MAX_BARS * 2) {
		struct adf_bar *bar = &accel_pci_dev->pci_bars[i++];

		bar->base_addr = pci_resource_start(pdev, bar_nr);
		if (!bar->base_addr)
			break;
		bar->size = pci_resource_len(pdev, bar_nr);
		bar->virt_addr = pci_iomap(accel_pci_dev->pci_dev, bar_nr, 0);
		if (!bar->virt_addr) {
			dev_err(&pdev->dev, "Failed to map BAR %d\n", bar_nr);
			ret = -EFAULT;
			goto out_err_free_reg;
		}
	}
	pci_set_master(pdev);

	adf_enable_aer(accel_dev);

	if (pci_save_state(pdev)) {
		dev_err(&pdev->dev, "Failed to save pci state\n");
		ret = -ENOMEM;
		goto out_err_disable_aer;
	}

	ret = qat_crypto_dev_config(accel_dev);
	if (ret)
		goto out_err_disable_aer;

	ret = adf_dev_init(accel_dev);
	if (ret)
		goto out_err_dev_shutdown;

	ret = adf_dev_start(accel_dev);
	if (ret)
		goto out_err_dev_stop;

	return ret;

out_err_dev_stop:
	adf_dev_stop(accel_dev);
out_err_dev_shutdown:
	adf_dev_shutdown(accel_dev);
out_err_disable_aer:
	adf_disable_aer(accel_dev);
out_err_free_reg:
	pci_release_regions(accel_pci_dev->pci_dev);
out_err_disable:
	pci_disable_device(accel_pci_dev->pci_dev);
out_err:
	adf_cleanup_accel(accel_dev);
	kfree(accel_dev);
	return ret;
}