linux-kernel - Re: [PATCH] PCI: designware: move dw_pcie_iatu_unroll

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Message-ID: <20171020174108.GK6332@bhelgaas-glaptop.roam.corp.google.com>
Date:   Fri, 20 Oct 2017 12:41:08 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Pankaj Dubey <pankaj.dubey@...sung.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>
Subject: Re: [PATCH] PCI: designware: move dw_pcie_iatu_unroll_enabled to
 pcie-designware.c

On Thu, Oct 12, 2017 at 10:11:08AM +0530, Pankaj Dubey wrote:
> IATU unroll feature can be enabled in EP mode as well, so we need to
> have this check in pcie-designware-ep.c, so instead of making this
> function as static in pcie-desigware-host.c, let's move this in
> pcie-designware.c so that both pcie-designware-host.c and
> pcie-designware-ep.c can use it.
> 
> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>

This is fine with me but I'm looking for an ack from Jingoo and/or Joao.

> ---
>  drivers/pci/dwc/pcie-designware-ep.c   |  4 ++++
>  drivers/pci/dwc/pcie-designware-host.c | 11 -----------
>  drivers/pci/dwc/pcie-designware.c      | 11 +++++++++++
>  drivers/pci/dwc/pcie-designware.h      |  1 +
>  4 files changed, 16 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
> index d53d5f1..64803a9 100644
> --- a/drivers/pci/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/dwc/pcie-designware-ep.c
> @@ -314,6 +314,10 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>  	if (ep->ops->ep_init)
>  		ep->ops->ep_init(ep);
>  
> +	pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
> +	dev_dbg(dev, "iATU unroll: %s\n",
> +		pci->iatu_unroll_enabled ? "enabled" : "disabled");
> +
>  	epc = devm_pci_epc_create(dev, &epc_ops);
>  	if (IS_ERR(epc)) {
>  		dev_err(dev, "failed to create epc device\n");
> diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
> index 81e2157..d3f579e 100644
> --- a/drivers/pci/dwc/pcie-designware-host.c
> +++ b/drivers/pci/dwc/pcie-designware-host.c
> @@ -574,17 +574,6 @@ static struct pci_ops dw_pcie_ops = {
>  	.write = dw_pcie_wr_conf,
>  };
>  
> -static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
> -{
> -	u32 val;
> -
> -	val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
> -	if (val == 0xffffffff)
> -		return 1;
> -
> -	return 0;
> -}
> -
>  void dw_pcie_setup_rc(struct pcie_port *pp)
>  {
>  	u32 val;
> diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
> index 88abddd..f15da90 100644
> --- a/drivers/pci/dwc/pcie-designware.c
> +++ b/drivers/pci/dwc/pcie-designware.c
> @@ -92,6 +92,17 @@ void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
>  		dev_err(pci->dev, "write DBI address failed\n");
>  }
>  
> +u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)

I know this is just moved verbatim, but it's more conventional to simply
return an int (or possibly bool) for a predicate like this.  There's really
no point in going out of your way to specify "u8" for the return type.

> +{
> +	u32 val;
> +
> +	val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
> +	if (val == 0xffffffff)
> +		return 1;
> +
> +	return 0;
> +}
> +
>  static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
>  {
>  	u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
> diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
> index e5d9d77..8d6829c 100644
> --- a/drivers/pci/dwc/pcie-designware.h
> +++ b/drivers/pci/dwc/pcie-designware.h
> @@ -242,6 +242,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
>  void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>  			 enum dw_pcie_region_type type);
>  void dw_pcie_setup(struct dw_pcie *pci);
> +u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci);
>  
>  static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
>  {
> -- 
> 2.7.4
>