linux-kernel - Re: [PATCH v2 08/11] PCI: mvebu: Use child

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Date:   Thu, 20 Jan 2022 10:49:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Marek Behún <kabel@...nel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 08/11] PCI: mvebu: Use child_ops API

On Wed, Jan 12, 2022 at 04:18:11PM +0100, Pali Rohár wrote:
> Split struct pci_ops between ops and child_ops. Member ops is used for
> accessing PCIe Root Ports via pci-bridge-emul.c driver and child_ops for
> accessing real PCIe cards.
> 
> There is no need to mix these two struct pci_ops into one as PCI core code
> already provides separate callbacks via bridge->ops and bridge->child_ops.
> 
> Signed-off-by: Pali Rohár <pali@...nel.org>
> ---
>  drivers/pci/controller/pci-mvebu.c | 82 ++++++++++++++++--------------
>  1 file changed, 44 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index 9ea2f6a7c2b0..1e90ab888075 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -294,11 +294,29 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
>  	mvebu_writel(port, mask, PCIE_MASK_OFF);
>  }
>  
> -static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
> -				 struct pci_bus *bus,
> -				 u32 devfn, int where, int size, u32 *val)
> +static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
> +						    struct pci_bus *bus,
> +						    int devfn);
> +
> +static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where,
> +				    int size, u32 *val)
>  {
> -	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> +	struct mvebu_pcie *pcie = bus->sysdata;
> +	struct mvebu_pcie_port *port;
> +	void __iomem *conf_data;
> +
> +	port = mvebu_pcie_find_port(pcie, bus, devfn);
> +	if (!port) {
> +		*val = 0xffffffff;
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +	}
> +
> +	if (!mvebu_pcie_link_up(port)) {
> +		*val = 0xffffffff;
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +	}
> +
> +	conf_data = port->base + PCIE_CONF_DATA_OFF;
>  
>  	mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where),
>  		     PCIE_CONF_ADDR_OFF);
> @@ -321,11 +339,21 @@ static int mvebu_pcie_hw_rd_conf(struct mvebu_pcie_port *port,
>  	return PCIBIOS_SUCCESSFUL;
>  }
>  
> -static int mvebu_pcie_hw_wr_conf(struct mvebu_pcie_port *port,
> -				 struct pci_bus *bus,
> -				 u32 devfn, int where, int size, u32 val)
> +static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn,
> +				    int where, int size, u32 val)
>  {
> -	void __iomem *conf_data = port->base + PCIE_CONF_DATA_OFF;
> +	struct mvebu_pcie *pcie = bus->sysdata;
> +	struct mvebu_pcie_port *port;
> +	void __iomem *conf_data;
> +

> +	port = mvebu_pcie_find_port(pcie, bus, devfn);
> +	if (!port)
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +
> +	if (!mvebu_pcie_link_up(port))
> +		return PCIBIOS_DEVICE_NOT_FOUND;
> +
> +	conf_data = port->base + PCIE_CONF_DATA_OFF;

Again, the same setup code in read and write is a sign to use 
.map_bus(). You can copy it from my version I pointed you to.

Rob