linux-kernel - Re: [PATCH v3 3/4] PCI/ACPI: Move _OSC query checks to separate function

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Date:   Wed, 1 Sep 2021 20:57:30 +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>
Subject: Re: [PATCH v3 3/4] PCI/ACPI: Move _OSC query checks to separate function

On Tue, Aug 24, 2021 at 2:21 PM Joerg Roedel <joro@...tes.org> wrote:
>
> From: Joerg Roedel <jroedel@...e.de>
>
> Move the checks about whether the _OSC controls are requested from the
> firmware to a separate function.
>
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

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

> ---
>  drivers/acpi/pci_root.c | 28 +++++++++++++++++++---------
>  1 file changed, 19 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index ed4e6b55e9bc..f12e512bcddc 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -449,6 +449,24 @@ static u32 calculate_control(void)
>         return control;
>  }
>
> +static bool os_control_query_checks(struct acpi_pci_root *root, u32 support)
> +{
> +       struct acpi_device *device = root->device;
> +
> +       if (pcie_ports_disabled) {
> +               dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
> +               return false;
> +       }
> +
> +       if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
> +               decode_osc_support(root, "not requesting OS control; OS requires",
> +                                  ACPI_PCIE_REQ_SUPPORT);
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
>  static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
>                                  bool is_pcie)
>  {
> @@ -485,16 +503,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
>                 return;
>         }
>
> -       if (pcie_ports_disabled) {
> -               dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
> +       if (!os_control_query_checks(root, support))
>                 return;
> -       }
> -
> -       if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
> -               decode_osc_support(root, "not requesting OS control; OS requires",
> -                                  ACPI_PCIE_REQ_SUPPORT);
> -               return;
> -       }
>
>         requested = control = calculate_control();
>
> --
> 2.32.0
>