Re: [PATCH v3 08/10] iommu/vt-d: Check whether device requires bounce buffer

[Christoph Hellwig]

On Sun, Apr 21, 2019 at 09:17:17AM +0800, Lu Baolu wrote:
> +static inline bool device_needs_bounce(struct device *dev)
> +{
> +	struct pci_dev *pdev = NULL;
> +
> +	if (intel_no_bounce)
> +		return false;
> +
> +	if (dev_is_pci(dev))
> +		pdev = to_pci_dev(dev);
> +
> +	return pdev ? pdev->untrusted : false;
> +}

Again, this and the option should not be in a specific iommu driver.