linux-kernel - Re: [PATCH v9 4/8] PCI: endpoint: Pass page size as argument to pci_epc_mem

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Date:   Thu, 7 May 2020 08:22:19 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Tom Joseph <tjoseph@...ence.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>
CC:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Lad Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v9 4/8] PCI: endpoint: Pass page size as argument to
 pci_epc_mem_init()



On 4/23/2020 11:52 PM, Lad Prabhakar wrote:
> pci_epc_mem_init() internally used page size equal to *PAGE_SIZE* to
> manage the address space so instead just pass the page size as a
> argument to pci_epc_mem_init().
> 
> Also make pci_epc_mem_init() as a C function instead of a macro function
> in preparation for adding support for pci-epc-mem core to handle multiple
> windows.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Acked-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/controller/cadence/pcie-cadence-ep.c | 2 +-
>  drivers/pci/controller/pcie-rockchip-ep.c        | 2 +-
>  drivers/pci/endpoint/pci-epc-mem.c               | 7 +++++++
>  include/linux/pci-epc.h                          | 5 ++---
>  4 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
> index 1c173dad67d1..1c15c8352125 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
> @@ -450,7 +450,7 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)
>  		epc->max_functions = 1;
>  
>  	ret = pci_epc_mem_init(epc, pcie->mem_res->start,
> -			       resource_size(pcie->mem_res));
> +			       resource_size(pcie->mem_res), PAGE_SIZE);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to initialize the memory space\n");
>  		goto err_init;
> diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
> index d743b0a48988..5eaf36629a75 100644
> --- a/drivers/pci/controller/pcie-rockchip-ep.c
> +++ b/drivers/pci/controller/pcie-rockchip-ep.c
> @@ -615,7 +615,7 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
>  	rockchip_pcie_write(rockchip, BIT(0), PCIE_CORE_PHY_FUNC_CFG);
>  
>  	err = pci_epc_mem_init(epc, rockchip->mem_res->start,
> -			       resource_size(rockchip->mem_res));
> +			       resource_size(rockchip->mem_res), PAGE_SIZE);
>  	if (err < 0) {
>  		dev_err(dev, "failed to initialize the memory space\n");
>  		goto err_uninit_port;
> diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c
> index abfac1109a13..cdd1d3821249 100644
> --- a/drivers/pci/endpoint/pci-epc-mem.c
> +++ b/drivers/pci/endpoint/pci-epc-mem.c
> @@ -93,6 +93,13 @@ return ret;
>  }
>  EXPORT_SYMBOL_GPL(__pci_epc_mem_init);
>  
> +int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
> +		     size_t size, size_t page_size)
> +{
> +	return __pci_epc_mem_init(epc, base, size, page_size);
> +}
> +EXPORT_SYMBOL_GPL(pci_epc_mem_init);
> +
>  /**
>   * pci_epc_mem_exit() - cleanup the pci_epc_mem structure
>   * @epc: the EPC device that invoked pci_epc_mem_exit
> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
> index e0ed9d01f6e5..5bc1de65849e 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -137,9 +137,6 @@ struct pci_epc_features {
>  #define devm_pci_epc_create(dev, ops)    \
>  		__devm_pci_epc_create((dev), (ops), THIS_MODULE)
>  
> -#define pci_epc_mem_init(epc, phys_addr, size)	\
> -		__pci_epc_mem_init((epc), (phys_addr), (size), PAGE_SIZE)
> -
>  static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
>  {
>  	dev_set_drvdata(&epc->dev, data);
> @@ -195,6 +192,8 @@ unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
>  struct pci_epc *pci_epc_get(const char *epc_name);
>  void pci_epc_put(struct pci_epc *epc);
>  
> +int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
> +		     size_t size, size_t page_size);
>  int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size,
>  		       size_t page_size);
>  void pci_epc_mem_exit(struct pci_epc *epc);
>