linux-kernel - RE: [PATCH v7 15/18] NTB: Add support for EPF PCI-Express Non-Transparent Bridge

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Date:   Mon, 9 Nov 2020 09:37:00 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     "kishon@...com" <kishon@...com>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        "jdmason@...zu.us" <jdmason@...zu.us>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "allenbh@...il.com" <allenbh@...il.com>,
        "tjoseph@...ence.com" <tjoseph@...ence.com>,
        Rob Herring <robh@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-ntb@...glegroups.com" <linux-ntb@...glegroups.com>
Subject: RE: [PATCH v7 15/18] NTB: Add support for EPF PCI-Express
 Non-Transparent Bridge

Hi Kishon,

> Subject: [PATCH v7 15/18] NTB: Add support for EPF PCI-Express Non-
> Transparent Bridge
> 
> From: Kishon Vijay Abraham I <kishon@...com>
> 
> Add support for EPF PCI-Express Non-Transparent Bridge (NTB) device.
> This driver is platform independent and could be used by any platform which
> have multiple PCIe endpoint instances configured using the pci-epf-ntb driver.
> The driver connnects to the standard NTB sub-system interface. The EPF NTB
> device has configurable number of memory windows (Max 4), configurable
> number of doorbell (Max 32), and configurable number of scratch-pad
> registers.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/ntb/hw/Kconfig          |   1 +
>  drivers/ntb/hw/Makefile         |   1 +
>  drivers/ntb/hw/epf/Kconfig      |   6 +
>  drivers/ntb/hw/epf/Makefile     |   1 +
>  drivers/ntb/hw/epf/ntb_hw_epf.c | 755
> ++++++++++++++++++++++++++++++++
>  5 files changed, 764 insertions(+)
>  create mode 100644 drivers/ntb/hw/epf/Kconfig  create mode 100644
> drivers/ntb/hw/epf/Makefile  create mode 100644
> drivers/ntb/hw/epf/ntb_hw_epf.c
> 
> diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig index
> e77c587060ff..c325be526b80 100644
> --- a/drivers/ntb/hw/Kconfig
> +++ b/drivers/ntb/hw/Kconfig
> @@ -2,4 +2,5 @@
>  source "drivers/ntb/hw/amd/Kconfig"
>  source "drivers/ntb/hw/idt/Kconfig"
>  source "drivers/ntb/hw/intel/Kconfig"
> +source "drivers/ntb/hw/epf/Kconfig"
>  source "drivers/ntb/hw/mscc/Kconfig"
> diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile index
> 4714d6238845..223ca592b5f9 100644
> --- a/drivers/ntb/hw/Makefile
> +++ b/drivers/ntb/hw/Makefile
> @@ -2,4 +2,5 @@
>  obj-$(CONFIG_NTB_AMD)	+= amd/
>  obj-$(CONFIG_NTB_IDT)	+= idt/
>  obj-$(CONFIG_NTB_INTEL)	+= intel/
> +obj-$(CONFIG_NTB_EPF)	+= epf/
>  obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
> diff --git a/drivers/ntb/hw/epf/Kconfig b/drivers/ntb/hw/epf/Kconfig new
> file mode 100644 index 000000000000..6197d1aab344
> --- /dev/null
> +++ b/drivers/ntb/hw/epf/Kconfig
> @@ -0,0 +1,6 @@
> +config NTB_EPF
> +	tristate "Generic EPF Non-Transparent Bridge support"
> +	depends on m
> +	help
> +	  This driver supports EPF NTB on configurable endpoint.
> +	  If unsure, say N.
> diff --git a/drivers/ntb/hw/epf/Makefile b/drivers/ntb/hw/epf/Makefile new
> file mode 100644 index 000000000000..2f560a422bc6
> --- /dev/null
> +++ b/drivers/ntb/hw/epf/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_NTB_EPF) += ntb_hw_epf.o
> diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c
> b/drivers/ntb/hw/epf/ntb_hw_epf.c new file mode 100644 index
> 000000000000..0a144987851a
> --- /dev/null
> +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c
> @@ -0,0 +1,755 @@
......
> +static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
> +			    struct pci_dev *pdev)
> +{
> +	struct device *dev = ndev->dev;
> +	int ret;
> +
> +	pci_set_drvdata(pdev, ndev);
> +
> +	ret = pci_enable_device(pdev);
> +	if (ret) {
> +		dev_err(dev, "Cannot enable PCI device\n");
> +		goto err_pci_enable;
> +	}
> +
> +	ret = pci_request_regions(pdev, "ntb");
> +	if (ret) {
> +		dev_err(dev, "Cannot obtain PCI resources\n");
> +		goto err_pci_regions;
> +	}
> +
> +	pci_set_master(pdev);
> +
> +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +	if (ret) {
> +		ret = dma_set_mask_and_coherent(dev,
> DMA_BIT_MASK(32));
> +		if (ret) {
> +			dev_err(dev, "Cannot set DMA mask\n");
> +			goto err_dma_mask;
> +		}
> +		dev_warn(&pdev->dev, "Cannot DMA highmem\n");
> +	}
> +
> +	ndev->ctrl_reg = pci_iomap(pdev, 0, 0);

The second parameter of pci_iomap should be ndev->ctrl_reg_bar instead of the hardcode value 0, right?

> +	if (!ndev->ctrl_reg) {
> +		ret = -EIO;
> +		goto err_dma_mask;
> +	}
> +
> +	ndev->peer_spad_reg = pci_iomap(pdev, 1, 0);

pci_iomap(pdev, ndev->peer_spad_reg_bar, 0);

> +	if (!ndev->peer_spad_reg) {
> +		ret = -EIO;
> +		goto err_dma_mask;
> +	}
> +
> +	ndev->db_reg = pci_iomap(pdev, 2, 0);

pci_iomap(pdev, ndev->db_reg_bar, 0);

Best Regards
Sherry