[PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist

[PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist

[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

Re: [PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist

[sashiko-bot]

> 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>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260901083653.48890-1-leoliu-oc@zhaoxin.com?part=1

Re: [PATCH] PCI/P2PDMA: Add Zhaoxin host bridges to whitelist

[Bjorn Helgaas]

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
> 
>