linux-kernel - [PATCH] Whitelist AMD host bridge device(s) to enable P2P DMA

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Date:   Wed, 11 Aug 2021 14:11:04 -0500
From:   Ramesh Errabolu <Ramesh.Errabolu@....com>
To:     <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Ramesh Errabolu <Ramesh.Errabolu@....com>
Subject: [PATCH] Whitelist AMD host bridge device(s) to enable P2P DMA

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

Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu@....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