linux-kernel - Re: [PATCH v4] vfio/cdx: add support for CDX bus

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Message-ID: <ZD6IiHjWQOv47ZMg@ziepe.ca>
Date:   Tue, 18 Apr 2023 09:09:44 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Nipun Gupta <nipun.gupta@....com>
Cc:     alex.williamson@...hat.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, masahiroy@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, nicolas@...sle.eu, git@....com,
        harpreet.anand@....com, pieter.jansen-van-vuuren@....com,
        nikhil.agarwal@....com, michal.simek@....com
Subject: Re: [PATCH v4] vfio/cdx: add support for CDX bus

On Tue, Apr 18, 2023 at 05:06:55PM +0530, Nipun Gupta wrote:

> diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
> index 89e06c981e43..aba36f5be4ec 100644
> --- a/drivers/vfio/Kconfig
> +++ b/drivers/vfio/Kconfig
> @@ -57,6 +57,7 @@ source "drivers/vfio/pci/Kconfig"
>  source "drivers/vfio/platform/Kconfig"
>  source "drivers/vfio/mdev/Kconfig"
>  source "drivers/vfio/fsl-mc/Kconfig"
> +source "drivers/vfio/cdx/Kconfig"

keep sorted

>  endif
>
>  source "virt/lib/Kconfig"
> diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
> index 70e7dcb302ef..1a27b2516612 100644
> --- a/drivers/vfio/Makefile
> +++ b/drivers/vfio/Makefile
> @@ -14,3 +14,4 @@ obj-$(CONFIG_VFIO_PCI) += pci/
>  obj-$(CONFIG_VFIO_PLATFORM) += platform/
>  obj-$(CONFIG_VFIO_MDEV) += mdev/
>  obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/
> +obj-$(CONFIG_VFIO_CDX) += cdx/

keep sorted

> diff --git a/drivers/vfio/cdx/Makefile b/drivers/vfio/cdx/Makefile
> new file mode 100644
> index 000000000000..82e4ef412c0f
> --- /dev/null
> +++ b/drivers/vfio/cdx/Makefile
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
> +#
> +
> +obj-$(CONFIG_VFIO_CDX) += vfio-cdx.o
> +
> +vfio-cdx-objs := vfio_cdx.o

Linus has asked about "suttering" filenames before, suggest to call
this

"vfio/cdx/main.c"

> +static long vfio_cdx_ioctl(struct vfio_device *core_vdev,
> +			   unsigned int cmd, unsigned long arg)
> +{
> +	struct vfio_cdx_device *vdev =
> +		container_of(core_vdev, struct vfio_cdx_device, vdev);
> +	struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
> +	unsigned long minsz;
> +
> +	switch (cmd) {
> +	case VFIO_DEVICE_GET_INFO:
> +	{
> +		struct vfio_device_info info;
> +
> +		minsz = offsetofend(struct vfio_device_info, num_irqs);
> +
> +		if (copy_from_user(&info, (void __user *)arg, minsz))
> +			return -EFAULT;
> +
> +		if (info.argsz < minsz)
> +			return -EINVAL;
> +
> +		info.flags = VFIO_DEVICE_FLAGS_CDX;
> +		info.flags |= VFIO_DEVICE_FLAGS_RESET;
> +
> +		info.num_regions = cdx_dev->res_count;
> +		info.num_irqs = 0;
> +
> +		return copy_to_user((void __user *)arg, &info, minsz) ?
> +			-EFAULT : 0;
> +	}
> +	case VFIO_DEVICE_GET_REGION_INFO:
> +	{
> +		struct vfio_region_info info;
> +
> +		minsz = offsetofend(struct vfio_region_info, offset);
> +
> +		if (copy_from_user(&info, (void __user *)arg, minsz))
> +			return -EFAULT;
> +
> +		if (info.argsz < minsz)
> +			return -EINVAL;
> +
> +		if (info.index >= cdx_dev->res_count)
> +			return -EINVAL;
> +
> +		/* map offset to the physical address  */
> +		info.offset = vfio_cdx_index_to_offset(info.index);
> +		info.size = vdev->regions[info.index].size;
> +		info.flags = vdev->regions[info.index].flags;
> +
> +		if (copy_to_user((void __user *)arg, &info, minsz))
> +			return -EFAULT;
> +		return 0;
> +	}
> +	case VFIO_DEVICE_RESET:
> +	{
> +		return cdx_dev_reset(core_vdev->dev);
> +	}
> +	default:
> +		return -ENOTTY;
> +	}
> +}

Please split this into functions, eg look at PCI

Jason