On Tue, Feb 18, 2025 at 10:10:09PM +1100, Alexey Kardashevskiy wrote:
> So far PCI BARs could not be mapped as encrypted so there was no
> need in API supporting encrypted mappings. TDISP is adding such
> support so add pci_iomap_range_encrypted() to allow PCI drivers
> do the encrypted mapping when needed.
Match subject capitalization, rewrap.
> +void __iomem *pci_iomap_range_encrypted(struct pci_dev *dev,
> + int bar,
> + unsigned long offset,
> + unsigned long maxlen)
> +{
> + resource_size_t start = pci_resource_start(dev, bar);
> + resource_size_t len = pci_resource_len(dev, bar);
> + unsigned long flags = pci_resource_flags(dev, bar);
> +
> + if (len <= offset || !start)
> + return NULL;
> + len -= offset;
> + start += offset;
> + if (maxlen && len > maxlen)
> + len = maxlen;
> + if (flags & IORESOURCE_IO)
> + return NULL;
> + if ((flags & IORESOURCE_MEM) && (flags & IORESOURCE_VALIDATED))
> + return ioremap_encrypted(start, len);
> + /* What? */
"What?" indeed. This could be removed or made to say something
intelligible.
> + return NULL;
> +}
> +EXPORT_SYMBOL(pci_iomap_range_encrypted);
> +
> /**
> * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
> * @dev: PCI device that owns the BAR
> --
> 2.47.1
>
