linux-kernel - Re: [PATCH v1] PCI: Remove PCI_REASSIGN_ALL

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Date:   Fri, 1 Dec 2017 09:37:42 +0530
From:   Manikanta Maddireddy <mmaddireddy@...dia.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     <linux-pci@...r.kernel.org>, Rob Herring <robh@...nel.org>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        <linux-kernel@...r.kernel.org>,
        "Simon Horman" <horms@...ge.net.au>,
        Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH v1] PCI: Remove PCI_REASSIGN_ALL_RSRC use on arm and arm64



On 01-Dec-17 1:45 AM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> On arm, PCI_REASSIGN_ALL_RSRC is used only in pcibios_assign_all_busses(),
> which helps decide whether to reconfigure bridge bus numbers.  It has
> nothing to do with BAR assignments.  On arm64 and powerpc,
> pcibios_assign_all_busses() tests PCI_REASSIGN_ALL_BUS, which makes more
> sense.
> 
> Align arm with arm64 and powerpc, so they all use PCI_REASSIGN_ALL_BUS for
> pcibios_assign_all_busses().
> 
> Remove PCI_REASSIGN_ALL_RSRC from the Tegra, Versatile, and R-Car drivers.
> These drivers are used only on arm or arm64, where PCI_REASSIGN_ALL_RSRC is
> not used after this change, so removing it should have no effect.
> 
> No functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Reviewed-by: Manikanta Maddireddy <mmaddireddy@...dia.com>

> ---
>  arch/arm/include/asm/pci.h       |    5 +----
>  arch/arm/kernel/bios32.c         |    2 +-
>  drivers/pci/host/pci-tegra.c     |    2 +-
>  drivers/pci/host/pci-versatile.c |    2 +-
>  drivers/pci/host/pcie-rcar.c     |    2 +-
>  5 files changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm/include/asm/pci.h b/arch/arm/include/asm/pci.h
> index 960d9dc4f380..1f0de808d111 100644
> --- a/arch/arm/include/asm/pci.h
> +++ b/arch/arm/include/asm/pci.h
> @@ -10,10 +10,7 @@ extern unsigned long pcibios_min_io;
>  extern unsigned long pcibios_min_mem;
>  #define PCIBIOS_MIN_MEM pcibios_min_mem
>  
> -static inline int pcibios_assign_all_busses(void)
> -{
> -	return pci_has_flag(PCI_REASSIGN_ALL_RSRC);
> -}
> +#define pcibios_assign_all_busses()	pci_has_flag(PCI_REASSIGN_ALL_BUS)
>  
>  #ifdef CONFIG_PCI_DOMAINS
>  static inline int pci_proc_domain(struct pci_bus *bus)
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index 0cd0aefb3a8f..ed46ca69813d 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -527,7 +527,7 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
>  	struct pci_sys_data *sys;
>  	LIST_HEAD(head);
>  
> -	pci_add_flags(PCI_REASSIGN_ALL_RSRC);
> +	pci_add_flags(PCI_REASSIGN_ALL_BUS);
>  	if (hw->preinit)
>  		hw->preinit();
>  	pcibios_init_hw(parent, hw, &head);
> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
> index f9d3960dc39f..ee193767f77b 100644
> --- a/drivers/pci/host/pci-tegra.c
> +++ b/drivers/pci/host/pci-tegra.c
> @@ -2382,7 +2382,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>  
>  	tegra_pcie_enable_ports(pcie);
>  
> -	pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
> +	pci_add_flags(PCI_REASSIGN_ALL_BUS);
>  	host->busnr = pcie->busn.start;
>  	host->dev.parent = &pdev->dev;
>  	host->ops = &tegra_pcie_ops;
> diff --git a/drivers/pci/host/pci-versatile.c b/drivers/pci/host/pci-versatile.c
> index d417acab0ecf..2a2dfcd68e86 100644
> --- a/drivers/pci/host/pci-versatile.c
> +++ b/drivers/pci/host/pci-versatile.c
> @@ -202,7 +202,7 @@ static int versatile_pci_probe(struct platform_device *pdev)
>  	writel(0, versatile_cfg_base[0] + PCI_INTERRUPT_LINE);
>  
>  	pci_add_flags(PCI_ENABLE_PROC_DOMAINS);
> -	pci_add_flags(PCI_REASSIGN_ALL_BUS | PCI_REASSIGN_ALL_RSRC);
> +	pci_add_flags(PCI_REASSIGN_ALL_BUS);
>  
>  	list_splice_init(&pci_res, &bridge->windows);
>  	bridge->dev.parent = dev;
> diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
> index 12796eccb2be..03fabb0552ae 100644
> --- a/drivers/pci/host/pcie-rcar.c
> +++ b/drivers/pci/host/pcie-rcar.c
> @@ -459,7 +459,7 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie)
>  
>  	rcar_pcie_setup(&bridge->windows, pcie);
>  
> -	pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
> +	pci_add_flags(PCI_REASSIGN_ALL_BUS);
>  
>  	bridge->dev.parent = dev;
>  	bridge->sysdata = pcie;
>