linux-kernel - Re: [RFC PATCH 3/5] misc: pci_endpoint_test: Add driver data for Renesas RZ/G2{EHMN}

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Date:   Mon, 14 Feb 2022 15:32:32 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [RFC PATCH 3/5] misc: pci_endpoint_test: Add driver data for
 Renesas RZ/G2{EHMN}

On Wed, Jan 26, 2022 at 07:50:41PM +0000, Lad Prabhakar wrote:
> Add "dmac_data_alignment" member (indicating the alignment requirement
> for internal DMAC for data transfers) to struct pci_endpoint_test_data
> and add driver_data to Renesas RZ/G2{EHMN}.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/misc/pci_endpoint_test.c | 40 ++++++++++++++++++++++++++------
>  1 file changed, 33 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
> index 8f786a225dcf..0a00d45830e9 100644
> --- a/drivers/misc/pci_endpoint_test.c
> +++ b/drivers/misc/pci_endpoint_test.c
> @@ -116,6 +116,7 @@ struct pci_endpoint_test {
>  	struct miscdevice miscdev;
>  	enum pci_barno test_reg_bar;
>  	size_t alignment;
> +	size_t dmac_data_alignment;

Alignment is a generic requirement, so this could be "dma_alignment" or
"data_alignment". Eventhough the only current user is internal DMA, this can
also be used by others in the future.

Thanks,
Mani

>  	const char *name;
>  };
>  
> @@ -123,6 +124,7 @@ struct pci_endpoint_test_data {
>  	enum pci_barno test_reg_bar;
>  	size_t alignment;
>  	int irq_type;
> +	size_t dmac_data_alignment;
>  };
>  
>  static inline u32 pci_endpoint_test_readl(struct pci_endpoint_test *test,
> @@ -368,8 +370,11 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test,
>  		goto err;
>  
>  	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
> -	if (use_dma)
> +	if (use_dma) {
>  		flags |= FLAG_USE_DMA;
> +		if (test->dmac_data_alignment)
> +			size =  ALIGN(size, test->dmac_data_alignment);
> +	}
>  
>  	if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
>  		dev_err(dev, "Invalid IRQ type option\n");
> @@ -502,8 +507,11 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test,
>  		goto err;
>  
>  	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
> -	if (use_dma)
> +	if (use_dma) {
>  		flags |= FLAG_USE_DMA;
> +		if (test->dmac_data_alignment)
> +			size =  ALIGN(size, test->dmac_data_alignment);
> +	}
>  
>  	if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
>  		dev_err(dev, "Invalid IRQ type option\n");
> @@ -600,8 +608,11 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test,
>  		goto err;
>  
>  	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
> -	if (use_dma)
> +	if (use_dma) {
>  		flags |= FLAG_USE_DMA;
> +		if (test->dmac_data_alignment)
> +			size =  ALIGN(size, test->dmac_data_alignment);
> +	}
>  
>  	if (irq_type < IRQ_TYPE_LEGACY || irq_type > IRQ_TYPE_MSIX) {
>  		dev_err(dev, "Invalid IRQ type option\n");
> @@ -787,6 +798,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
>  		test->test_reg_bar = test_reg_bar;
>  		test->alignment = data->alignment;
>  		irq_type = data->irq_type;
> +		test->dmac_data_alignment = data->dmac_data_alignment;
>  	}
>  
>  	init_completion(&test->irq_raised);
> @@ -948,6 +960,12 @@ static const struct pci_endpoint_test_data j721e_data = {
>  	.irq_type = IRQ_TYPE_MSI,
>  };
>  
> +static const struct pci_endpoint_test_data renesas_rzg2x_data = {
> +	.test_reg_bar = BAR_0,
> +	.irq_type = IRQ_TYPE_MSI,
> +	.dmac_data_alignment = 8,
> +};
> +
>  static const struct pci_device_id pci_endpoint_test_tbl[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA74x),
>  	  .driver_data = (kernel_ulong_t)&default_data,
> @@ -965,10 +983,18 @@ static const struct pci_device_id pci_endpoint_test_tbl[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_AM654),
>  	  .driver_data = (kernel_ulong_t)&am654_data
>  	},
> -	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774A1),},
> -	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774B1),},
> -	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774C0),},
> -	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774E1),},
> +	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774A1),
> +	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
> +	},
> +	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774B1),
> +	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
> +	},
> +	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774C0),
> +	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
> +	},
> +	{ PCI_DEVICE(PCI_VENDOR_ID_RENESAS, PCI_DEVICE_ID_RENESAS_R8A774E1),
> +	 .driver_data = (kernel_ulong_t)&renesas_rzg2x_data,
> +	},
>  	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_J721E),
>  	  .driver_data = (kernel_ulong_t)&j721e_data,
>  	},
> -- 
> 2.25.1
>