On Wed, Aug 11, 2021 at 3:11 PM Ramesh Errabolu <Ramesh.Errabolu@xxxxxxx> wrote:
>
> Current implementation will disallow P2P DMA if the participating
> devices belong to different root complexes. Implementation allows
> this default behavior to be overridden for whitelisted devices. The
> patch adds an AMD host bridge to be whitelisted
Why do we need this? cpu_supports_p2pdma() should return true for all
AMD Zen CPUs.
Alex
>
> Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu@xxxxxxx>
> ---
> drivers/pci/p2pdma.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
> index 196382630363..7003bb9faf23 100644
> --- a/drivers/pci/p2pdma.c
> +++ b/drivers/pci/p2pdma.c
> @@ -305,6 +305,8 @@ static const struct pci_p2pdma_whitelist_entry {
> {PCI_VENDOR_ID_INTEL, 0x2032, 0},
> {PCI_VENDOR_ID_INTEL, 0x2033, 0},
> {PCI_VENDOR_ID_INTEL, 0x2020, 0},
> + /* AMD Host Bridge Devices */
> + {PCI_VENDOR_ID_AMD, 0x1480, 0},
> {}
> };
>
> --
> 2.31.1
>
