On Mon, Apr 12, 2021 at 02:46:02PM +0200, Pali Rohár wrote:
> Define new PCI_EXP_DEVCTL_PAYLOAD_* macros in linux/pci_regs.h header file
> for Max Payload Size. Macros are defined in the same style as existing
> macros PCI_EXP_DEVCTL_READRQ_* macros.
>
> Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
> ---
> include/uapi/linux/pci_regs.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index e709ae8235e7..8f1b15eea53e 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -504,6 +504,12 @@
> #define PCI_EXP_DEVCTL_URRE 0x0008 /* Unsupported Request Reporting En. */
> #define PCI_EXP_DEVCTL_RELAX_EN 0x0010 /* Enable relaxed ordering */
> #define PCI_EXP_DEVCTL_PAYLOAD 0x00e0 /* Max_Payload_Size */
> +#define PCI_EXP_DEVCTL_PAYLOAD_128B 0x0000 /* 128 Bytes */
> +#define PCI_EXP_DEVCTL_PAYLOAD_256B 0x0020 /* 256 Bytes */
> +#define PCI_EXP_DEVCTL_PAYLOAD_512B 0x0040 /* 512 Bytes */
> +#define PCI_EXP_DEVCTL_PAYLOAD_1024B 0x0060 /* 1024 Bytes */
> +#define PCI_EXP_DEVCTL_PAYLOAD_2048B 0x0080 /* 2048 Bytes */
> +#define PCI_EXP_DEVCTL_PAYLOAD_4096B 0x00A0 /* 4096 Bytes */
This is fine if we're going to use them, but we generally don't add
definitions purely for documentation.
5929b8a38ce0 ("PCI: Add defines for PCIe Max_Read_Request_Size") added
the PCI_EXP_DEVCTL_READRQ_* definitions and we do have a few (very
few) uses in drivers.
If we do need to add these, please follow the local use of lower-case
in the hex bitmasks. The file is a mixture, but the closest examples
are lower-case.
> #define PCI_EXP_DEVCTL_EXT_TAG 0x0100 /* Extended Tag Field Enable */
> #define PCI_EXP_DEVCTL_PHANTOM 0x0200 /* Phantom Functions Enable */
> #define PCI_EXP_DEVCTL_AUX_PME 0x0400 /* Auxiliary Power PM Enable */
> --
> 2.20.1
>
