linux-kernel - Re: [PATCH v3 1/4] dmaengine: dw-edma: Rename dw_edma_core_ops structure to dw_edma_plat

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Date:   Thu, 16 Feb 2023 16:41:56 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Cai Huoqing <cai.huoqing@...ux.dev>
Cc:     Sergey.Semin@...kalelectronics.ru,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v3 1/4] dmaengine: dw-edma: Rename dw_edma_core_ops
 structure to dw_edma_plat_ops

On Mon, Feb 13, 2023 at 09:24:06PM +0800, Cai Huoqing wrote:
> From: Cai huoqing <cai.huoqing@...ux.dev>
> 
> Rename dw_edma_core_ops structure to dw_edma_plat_ops, the ops is platform
> specific operations: the DMA device environment configs like IRQs,
> address translation, etc.
> 

> The dw_edma_pcie_plat_ops name was supposed to refer to the platform which

s/dw_edma_pcie_plat_ops/dw_edma_plat_ops
* The main goal is to update the structure name.

> the DW eDMA engine is embedded to, like PCIe end-point (accessible via
> the PCIe bus) or a PCIe root port (directly accessible by CPU).
> Needless to say that for them the IRQ-vector and PCI-addresses are
> differently determined. The suggested name has a connection with the
> kernel platform device only as a private case of the eDMA/hDMA embedded
> into the DW PCI Root ports, though basically it was supposed to refer to
> any platform in which the DMA hardware lives.
> 
> Anyway the renaming was necessary to distinguish two types of
> the implementation callbacks:
> 1. DW eDMA/hDMA IP-core specific operations: device-specific CSR
> setups in one or another aspect of the DMA-engine initialization.
> 2. DW eDMA/hDMA platform specific operations: the DMA device
> environment configs like IRQs, address translation, etc.
> 

> dw_edma_pcie_core_ops is supposed to be used for the case 1, and
> dw_edma_pcie_plat_ops - for the case 2.

ditto

> 
> Signed-off-by: Cai huoqing <cai.huoqing@...ux.dev>
> ---
>  drivers/dma/dw-edma/dw-edma-pcie.c           | 4 ++--
>  drivers/pci/controller/dwc/pcie-designware.c | 2 +-
>  include/linux/dma/edma.h                     | 7 ++++---
>  3 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
> index 2b40f2b44f5e..1c6043751dc9 100644
> --- a/drivers/dma/dw-edma/dw-edma-pcie.c
> +++ b/drivers/dma/dw-edma/dw-edma-pcie.c
> @@ -109,7 +109,7 @@ static u64 dw_edma_pcie_address(struct device *dev, phys_addr_t cpu_addr)
>  	return region.start;
>  }
>  
> -static const struct dw_edma_core_ops dw_edma_pcie_core_ops = {
> +static const struct dw_edma_plat_ops dw_edma_pcie_plat_ops = {
>  	.irq_vector = dw_edma_pcie_irq_vector,
>  	.pci_address = dw_edma_pcie_address,
>  };
> @@ -225,7 +225,7 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
>  
>  	chip->mf = vsec_data.mf;
>  	chip->nr_irqs = nr_irqs;
> -	chip->ops = &dw_edma_pcie_core_ops;
> +	chip->ops = &dw_edma_pcie_plat_ops;
>  
>  	chip->ll_wr_cnt = vsec_data.wr_ch_cnt;
>  	chip->ll_rd_cnt = vsec_data.rd_ch_cnt;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 53a16b8b6ac2..44e90b71d429 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -828,7 +828,7 @@ static int dw_pcie_edma_irq_vector(struct device *dev, unsigned int nr)
>  	return platform_get_irq_byname_optional(pdev, name);
>  }
>  
> -static struct dw_edma_core_ops dw_pcie_edma_ops = {
> +static struct dw_edma_plat_ops dw_pcie_edma_ops = {
>  	.irq_vector = dw_pcie_edma_irq_vector,
>  };
>  
> diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
> index d2638d9259dc..b2f3dd5e7e1a 100644
> --- a/include/linux/dma/edma.h
> +++ b/include/linux/dma/edma.h
> @@ -40,7 +40,7 @@ struct dw_edma_region {
>   *			iATU windows. That will be done by the controller
>   *			automatically.
>   */
> -struct dw_edma_core_ops {
> +struct dw_edma_plat_ops {
>  	int (*irq_vector)(struct device *dev, unsigned int nr);
>  	u64 (*pci_address)(struct device *dev, phys_addr_t cpu_addr);
>  };
> @@ -48,7 +48,8 @@ struct dw_edma_core_ops {
>  enum dw_edma_map_format {
>  	EDMA_MF_EDMA_LEGACY = 0x0,
>  	EDMA_MF_EDMA_UNROLL = 0x1,
> -	EDMA_MF_HDMA_COMPAT = 0x5
> +	EDMA_MF_HDMA_COMPAT = 0x5,

> +	EDMA_MF_HDMA_NATIVE = 0x7
                                 ^
Please add a comma here ---------+

Thus if there is a new entry is added to the enum list in future the
update will consist of a single-line change. It's a common practice in
kernel to terminate the last entry in enums or struct initializers if
there is a possibility to add new entries to the list afterwards.

>  };
>  
>  /**
> @@ -80,7 +81,7 @@ enum dw_edma_chip_flags {
>  struct dw_edma_chip {
>  	struct device		*dev;
>  	int			nr_irqs;

> -	const struct dw_edma_core_ops   *ops;
> +	const struct dw_edma_plat_ops   *ops;
                                     \ /
                                      ^
These are just three white-spaces ----+
Please replace them with either a tab or with a single space.

-Serge(y)

>  	u32			flags;
>  
>  	void __iomem		*reg_base;
> -- 
> 2.34.1
>