Re: [PATCH 2/6] PCI: Add PCI_EXP_SLTCAP_*_SHIFT macros

[Bjorn Helgaas <helgaas@kernel.org>]

On Tue, Feb 22, 2022 at 05:31:54PM +0100, Pali Rohár wrote:
> These macros allows to easily compose and extract Slot Power Limit and
> Physical Slot Number values from Slot Capability Register.
>
> Signed-off-by: Pali Rohár <pali@kernel.org>
> Signed-off-by: Marek Behún <kabel@kernel.org>
> ---
>  include/uapi/linux/pci_regs.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index 108f8523fa04..3fc9a4cac630 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -591,10 +591,13 @@
>  #define  PCI_EXP_SLTCAP_HPS	0x00000020 /* Hot-Plug Surprise */
>  #define  PCI_EXP_SLTCAP_HPC	0x00000040 /* Hot-Plug Capable */
>  #define  PCI_EXP_SLTCAP_SPLV	0x00007f80 /* Slot Power Limit Value */
> +#define  PCI_EXP_SLTCAP_SPLV_SHIFT	7  /* Slot Power Limit Value shift */

Is there a way to use FIELD_PREP() and FIELD_GET() instead?  It seems
like that's what the cool kids are doing now.

At first I didn't really like them, but they do remove the need for
adding _SHIFT macros that have to be manually related to the other.

>  #define  PCI_EXP_SLTCAP_SPLS	0x00018000 /* Slot Power Limit Scale */
> +#define  PCI_EXP_SLTCAP_SPLS_SHIFT	15 /* Slot Power Limit Scale shift */
>  #define  PCI_EXP_SLTCAP_EIP	0x00020000 /* Electromechanical Interlock Present */
>  #define  PCI_EXP_SLTCAP_NCCS	0x00040000 /* No Command Completed Support */
>  #define  PCI_EXP_SLTCAP_PSN	0xfff80000 /* Physical Slot Number */
> +#define  PCI_EXP_SLTCAP_PSN_SHIFT	19 /* Physical Slot Number shift */
>  #define PCI_EXP_SLTCTL		0x18	/* Slot Control */
>  #define  PCI_EXP_SLTCTL_ABPE	0x0001	/* Attention Button Pressed Enable */
>  #define  PCI_EXP_SLTCTL_PFDE	0x0002	/* Power Fault Detected Enable */
> -- 
> 2.20.1
>