linux-kernel - Re: [PATCH] PCI: layerscape: Add the SRIOV support in host side

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Date:   Mon, 02 Dec 2019 12:47:40 +0000
From:   Marc Zyngier <maz@...terjones.org>
To:     Xiaowei Bao <xiaowei.bao@....com>
Cc:     <robh+dt@...nel.org>, <frowand.list@...il.com>,
        <minghuan.lian@....com>, <mingkai.hu@....com>, <roy.zang@....com>,
        <lorenzo.pieralisi@....com>, <andrew.murray@....com>,
        <bhelgaas@...gle.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <zhiqiang.hou@....com>
Subject: Re: [PATCH] PCI: layerscape: Add the SRIOV support in host side

On 2019-12-02 10:45, Xiaowei Bao wrote:
> GIC get the map relations of devid and stream id from the msi-map
> property of DTS, our platform add this property in u-boot base on
> the PCIe device in the bus, but if enable the vf device in kernel,
> the vf device msi-map will not set, so the vf device can't work,
> this patch purpose is that manage the stream id and device id map
> relations dynamically in kernel, and make the new PCIe device work
> in kernel.
>
> Signed-off-by: Xiaowei Bao <xiaowei.bao@....com>
> ---
>  drivers/of/irq.c                            |  9 +++
>  drivers/pci/controller/dwc/pci-layerscape.c | 94
> +++++++++++++++++++++++++++++
>  drivers/pci/probe.c                         |  6 ++
>  drivers/pci/remove.c                        |  6 ++
>  4 files changed, 115 insertions(+)
>
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index a296eaf..791e609 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -576,6 +576,11 @@ void __init of_irq_init(const struct
> of_device_id *matches)
>  	}
>  }
>
> +u32 __weak ls_pcie_streamid_fix(struct device *dev, u32 rid)
> +{
> +	return rid;
> +}
> +
>  static u32 __of_msi_map_rid(struct device *dev, struct device_node 
> **np,
>  			    u32 rid_in)
>  {
> @@ -590,6 +595,10 @@ static u32 __of_msi_map_rid(struct device *dev,
> struct device_node **np,
>  		if (!of_map_rid(parent_dev->of_node, rid_in, "msi-map",
>  				"msi-map-mask", np, &rid_out))
>  			break;
> +
> +	if (rid_out == rid_in)
> +		rid_out = ls_pcie_streamid_fix(parent_dev, rid_in);

Over my dead body. Get your firmware to properly program the LUT
so that it presents the ITS with a reasonable topology. There is
absolutely no way this kind of change makes it into the kernel.

Thanks,

         M.
-- 
Who you jivin' with that Cosmik Debris?