linux-kernel - Re: [PATCH v3 1/4] PCI/ACPI: Remove OSC_PCI_SUPPORT_MASKS and OSC_PCI_CONTROL

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Message-ID: <CAJZ5v0iVKbL-4LngH7MeSZ69qArLC0488UR+kSnsPTsBD8qZnQ@mail.gmail.com>
Date:   Wed, 1 Sep 2021 20:53:26 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joerg Roedel <jroedel@...e.de>,
        Bjorn Helgaas <helgass@...nel.org>
Subject: Re: [PATCH v3 1/4] PCI/ACPI: Remove OSC_PCI_SUPPORT_MASKS and OSC_PCI_CONTROL_MASKS

On Tue, Aug 24, 2021 at 2:21 PM Joerg Roedel <joro@...tes.org> wrote:
>
> From: Joerg Roedel <jroedel@...e.de>
>
> These masks are only used internally in the PCI Host Bridge _OSC
> negotiation code, which already makes sure nothing outside of these
> masks is set. Remove the masks and simplify the code.
>
> Suggested-by: Bjorn Helgaas <helgass@...nel.org>
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

Reviewed-by: Rafael J. Wysocki <rafael@...nel.org>

> ---
>  drivers/acpi/pci_root.c | 9 +++------
>  include/linux/acpi.h    | 2 --
>  2 files changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index d7deedf3548e..0c3030a58219 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -199,18 +199,15 @@ static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
>         acpi_status status;
>         u32 result, capbuf[3];
>
> -       support &= OSC_PCI_SUPPORT_MASKS;
>         support |= root->osc_support_set;
>
>         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
>         capbuf[OSC_SUPPORT_DWORD] = support;
> -       if (control) {
> -               *control &= OSC_PCI_CONTROL_MASKS;
> +       if (control)
>                 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
> -       } else {
> +       else
>                 /* Run _OSC query only with existing controls. */
>                 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
> -       }
>
>         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
>         if (ACPI_SUCCESS(status)) {
> @@ -357,7 +354,7 @@ static acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 r
>         if (!mask)
>                 return AE_BAD_PARAMETER;
>
> -       ctrl = *mask & OSC_PCI_CONTROL_MASKS;
> +       ctrl = *mask;
>         if ((ctrl & req) != req)
>                 return AE_TYPE;
>
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 72e4f7fd268c..c6dba5f21384 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -577,7 +577,6 @@ extern u32 osc_sb_native_usb4_control;
>  #define OSC_PCI_MSI_SUPPORT                    0x00000010
>  #define OSC_PCI_EDR_SUPPORT                    0x00000080
>  #define OSC_PCI_HPX_TYPE_3_SUPPORT             0x00000100
> -#define OSC_PCI_SUPPORT_MASKS                  0x0000019f
>
>  /* PCI Host Bridge _OSC: Capabilities DWORD 3: Control Field */
>  #define OSC_PCI_EXPRESS_NATIVE_HP_CONTROL      0x00000001
> @@ -587,7 +586,6 @@ extern u32 osc_sb_native_usb4_control;
>  #define OSC_PCI_EXPRESS_CAPABILITY_CONTROL     0x00000010
>  #define OSC_PCI_EXPRESS_LTR_CONTROL            0x00000020
>  #define OSC_PCI_EXPRESS_DPC_CONTROL            0x00000080
> -#define OSC_PCI_CONTROL_MASKS                  0x000000bf
>
>  #define ACPI_GSB_ACCESS_ATTRIB_QUICK           0x00000002
>  #define ACPI_GSB_ACCESS_ATTRIB_SEND_RCV         0x00000004
> --
> 2.32.0
>