linux-kernel - Re: [PATCH] PCI/portdrv: Remove unused pcie_port_acpi

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Date:   Wed, 30 May 2018 11:48:17 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/portdrv: Remove unused pcie_port_acpi_setup()

On Thu, May 10, 2018 at 04:46:15PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> 02bfeb484230 ("PCI/portdrv: Simplify PCIe feature permission checking")
> removed the only call of pcie_port_acpi_setup() and removed portdrv_acpi.o
> from the Makefile, but I forgot to remove pcie_port_acpi_setup() itself.
> 
> Remove pcie_port_acpi_setup() and the drivers/pci/pcie/portdrv_acpi.c file.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

I applied this to pci/portdrv for v4.18.

> ---
>  drivers/pci/pcie/portdrv_acpi.c |   57 ---------------------------------------
>  1 file changed, 57 deletions(-)
>  delete mode 100644 drivers/pci/pcie/portdrv_acpi.c
> 
> diff --git a/drivers/pci/pcie/portdrv_acpi.c b/drivers/pci/pcie/portdrv_acpi.c
> deleted file mode 100644
> index 8ab5d434b9c6..000000000000
> --- a/drivers/pci/pcie/portdrv_acpi.c
> +++ /dev/null
> @@ -1,57 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -/*
> - * PCIe Port Native Services Support, ACPI-Related Part
> - *
> - * Copyright (C) 2010 Rafael J. Wysocki <rjw@...k.pl>, Novell Inc.
> - */
> -
> -#include <linux/pci.h>
> -#include <linux/kernel.h>
> -#include <linux/errno.h>
> -#include <linux/acpi.h>
> -#include <linux/pci-acpi.h>
> -
> -#include "aer/aerdrv.h"
> -#include "../pci.h"
> -#include "portdrv.h"
> -
> -/**
> - * pcie_port_acpi_setup - Request the BIOS to release control of PCIe services.
> - * @port: PCIe Port service for a root port or event collector.
> - * @srv_mask: Bit mask of services that can be enabled for @port.
> - *
> - * Invoked when @port is identified as a PCIe port device.  To avoid conflicts
> - * with the BIOS PCIe port native services support requires the BIOS to yield
> - * control of these services to the kernel.  The mask of services that the BIOS
> - * allows to be enabled for @port is written to @srv_mask.
> - *
> - * NOTE: It turns out that we cannot do that for individual port services
> - * separately, because that would make some systems work incorrectly.
> - */
> -void pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
> -{
> -	struct acpi_pci_root *root;
> -	acpi_handle handle;
> -	u32 flags;
> -
> -	if (acpi_pci_disabled)
> -		return;
> -
> -	handle = acpi_find_root_bridge_handle(port);
> -	if (!handle)
> -		return;
> -
> -	root = acpi_pci_find_root(handle);
> -	if (!root)
> -		return;
> -
> -	flags = root->osc_control_set;
> -
> -	*srv_mask = 0;
> -	if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
> -		*srv_mask |= PCIE_PORT_SERVICE_HP;
> -	if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
> -		*srv_mask |= PCIE_PORT_SERVICE_PME;
> -	if (flags & OSC_PCI_EXPRESS_AER_CONTROL)
> -		*srv_mask |= PCIE_PORT_SERVICE_AER | PCIE_PORT_SERVICE_DPC;
> -}
>