* [PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist
@ 2026-09-01 8:36 LeoLiu-oc
2026-09-03 22:17 ` Bjorn Helgaas
0 siblings, 1 reply; 2+ messages in thread
From: LeoLiu-oc @ 2026-09-01 8:36 UTC (permalink / raw)
To: Bjorn Helgaas, Logan Gunthorpe
Cc: linux-pci, linux-kernel, Eros Zhang, Cobe Chen, Tony W . Wang, LeoLiu-oc
Zhaoxin host bridges support peer-to-peer DMA. Add their device IDs
(0x1003, 0x1005-0x1008) to the whitelist so that p2pdma works on these
platforms.
The entries cover the KX-6000, KH-40000, KX-6000G, KX-7000 and KH-50000
families.
The KX-6000/KH-40000/KX-6000G/KX-7000 entries are marked
REQ_SAME_HOST_BRIDGE because P2P requests crossing different host bridges
are not supported on these parts. The KH-50000 entry is whitelisted
without this restriction.
Signed-off-by: LeoLiu-oc <leoliu-oc@zhaoxin.com>
---
drivers/pci/p2pdma.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 9334eb314663..9fbbf1692f0e 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -569,6 +569,12 @@ static const struct pci_p2pdma_whitelist_entry {
{PCI_VENDOR_ID_NVIDIA, 0x2f96, 0},
{PCI_VENDOR_ID_NVIDIA, 0x2f97, 0},
{PCI_VENDOR_ID_NVIDIA, 0x2f98, 0},
+ /* Zhaoxin KX-6000/KH-40000/KX-6000G/KX-7000/KH-50000 */
+ {PCI_VENDOR_ID_ZHAOXIN, 0x1003, REQ_SAME_HOST_BRIDGE},
+ {PCI_VENDOR_ID_ZHAOXIN, 0x1005, REQ_SAME_HOST_BRIDGE},
+ {PCI_VENDOR_ID_ZHAOXIN, 0x1006, REQ_SAME_HOST_BRIDGE},
+ {PCI_VENDOR_ID_ZHAOXIN, 0x1007, REQ_SAME_HOST_BRIDGE},
+ {PCI_VENDOR_ID_ZHAOXIN, 0x1008, 0},
{}
};
--
2.43.0
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist
2026-09-01 8:36 [PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist LeoLiu-oc
@ 2026-09-03 22:17 ` Bjorn Helgaas
0 siblings, 0 replies; 2+ messages in thread
From: Bjorn Helgaas @ 2026-09-03 22:17 UTC (permalink / raw)
To: LeoLiu-oc
Cc: Bjorn Helgaas, Logan Gunthorpe, linux-pci, linux-kernel,
Eros Zhang, Cobe Chen, Tony W . Wang
On Tue, Sep 01, 2026 at 04:36:53PM +0800, LeoLiu-oc wrote:
> Zhaoxin host bridges support peer-to-peer DMA. Add their device IDs
> (0x1003, 0x1005-0x1008) to the whitelist so that p2pdma works on these
> platforms.
>
> The entries cover the KX-6000, KH-40000, KX-6000G, KX-7000 and KH-50000
> families.
>
> The KX-6000/KH-40000/KX-6000G/KX-7000 entries are marked
> REQ_SAME_HOST_BRIDGE because P2P requests crossing different host bridges
> are not supported on these parts. The KH-50000 entry is whitelisted
> without this restriction.
>
> Signed-off-by: LeoLiu-oc <leoliu-oc@zhaoxin.com>
Applied to pci/p2pdma for v7.4, thank you!
> ---
> drivers/pci/p2pdma.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
> index 9334eb314663..9fbbf1692f0e 100644
> --- a/drivers/pci/p2pdma.c
> +++ b/drivers/pci/p2pdma.c
> @@ -569,6 +569,12 @@ static const struct pci_p2pdma_whitelist_entry {
> {PCI_VENDOR_ID_NVIDIA, 0x2f96, 0},
> {PCI_VENDOR_ID_NVIDIA, 0x2f97, 0},
> {PCI_VENDOR_ID_NVIDIA, 0x2f98, 0},
> + /* Zhaoxin KX-6000/KH-40000/KX-6000G/KX-7000/KH-50000 */
> + {PCI_VENDOR_ID_ZHAOXIN, 0x1003, REQ_SAME_HOST_BRIDGE},
> + {PCI_VENDOR_ID_ZHAOXIN, 0x1005, REQ_SAME_HOST_BRIDGE},
> + {PCI_VENDOR_ID_ZHAOXIN, 0x1006, REQ_SAME_HOST_BRIDGE},
> + {PCI_VENDOR_ID_ZHAOXIN, 0x1007, REQ_SAME_HOST_BRIDGE},
> + {PCI_VENDOR_ID_ZHAOXIN, 0x1008, 0},
> {}
> };
>
> --
> 2.43.0
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-09-03 22:17 ` Bjorn Helgaas
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