On Wed, Aug 11, 2021 at 3:11 PM Ramesh Errabolu Ramesh.Errabolu@amd.com 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@amd.com
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