Re: [PATCH v3 08/11] PCI: Add the ACS Enhanced Capability definitions

[Donald Dutile <ddutile@redhat.com>]

On 9/5/25 2:06 PM, Jason Gunthorpe wrote:
> This brings the definitions up to PCI Express revision 5.0:
> 
>   * ACS I/O Request Blocking Enable
>   * ACS DSP Memory Target Access Control
>   * ACS USP Memory Target Access Control
>   * ACS Unclaimed Request Redirect
> 
> Support for this entire grouping is advertised by the ACS Enhanced
> Capability bit.
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>   include/uapi/linux/pci_regs.h | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index 6095e7d7d4cc48..54621e6e83572e 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -1005,8 +1005,16 @@
>   #define  PCI_ACS_UF		0x0010	/* Upstream Forwarding */
>   #define  PCI_ACS_EC		0x0020	/* P2P Egress Control */
>   #define  PCI_ACS_DT		0x0040	/* Direct Translated P2P */
> +#define  PCI_ACS_ENHANCED	0x0080  /* IORB, DSP_MT_xx, USP_MT_XX. Capability only */
> +#define  PCI_ACS_EGRESS_CTL_SZ	GENMASK(15, 8) /* Egress Control Vector Size */
>   #define PCI_ACS_EGRESS_BITS	0x05	/* ACS Egress Control Vector Size */
>   #define PCI_ACS_CTRL		0x06	/* ACS Control Register */
> +#define  PCI_ACS_IORB		0x0080  /* I/O Request Blocking */
> +#define  PCI_ACS_DSP_MT_RB	0x0100  /* DSP Memory Target Access Control Request Blocking */
> +#define  PCI_ACS_DSP_MT_RR	0x0200  /* DSP Memory Target Access Control Request Redirect */
> +#define  PCI_ACS_USP_MT_RB	0x0400  /* USP Memory Target Access Control Request Blocking */
> +#define  PCI_ACS_USP_MT_RR	0x0800  /* USP Memory Target Access Control Request Redirect */
> +#define  PCI_ACS_UNCLAIMED_RR	0x1000  /* Unclaimed Request Redirect Control */
>   #define PCI_ACS_EGRESS_CTL_V	0x08	/* ACS Egress Control Vector */
>   
>   /*

Reviewed-by: Donald Dutile <ddutile@redhat.com>