linux-kernel - Re: [PATCH] media: staging: ipu3: Enable IOVA API only when IOMMU support is enabled

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Message-ID: <20190724103027.GD21370@paasikivi.fi.intel.com>
Date:   Wed, 24 Jul 2019 13:30:28 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     mchehab@...nel.org, gregkh@...uxfoundation.org, yong.zhi@...el.com,
        digetx@...il.com, hverkuil-cisco@...all.nl,
        linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-media@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] media: staging: ipu3: Enable IOVA API only when IOMMU
 support is enabled

Hi Yue,

On Mon, Jul 22, 2019 at 09:47:49PM +0800, YueHaibing wrote:
> If IOMMU_SUPPORT is not set, ipu3 driver may select IOMMU_IOVA to m.
> But for many drivers, they use "select IOMMU_IOVA if IOMMU_SUPPORT"
> in the Kconfig, for example, CONFIG_TEGRA_VDE is set to y but IOMMU_IOVA
> is m, then the building fails like this:
> 
> drivers/staging/media/tegra-vde/iommu.o: In function `tegra_vde_iommu_map':
> iommu.c:(.text+0x41): undefined reference to `alloc_iova'
> iommu.c:(.text+0x56): undefined reference to `__free_iova'
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 7fc7af649ca7 ("media: staging/intel-ipu3: Add imgu top level pci device driver")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  drivers/staging/media/ipu3/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/ipu3/Kconfig b/drivers/staging/media/ipu3/Kconfig
> index 4b51c67..b7df18f 100644
> --- a/drivers/staging/media/ipu3/Kconfig
> +++ b/drivers/staging/media/ipu3/Kconfig
> @@ -4,7 +4,7 @@ config VIDEO_IPU3_IMGU
>  	depends on PCI && VIDEO_V4L2
>  	depends on MEDIA_CONTROLLER && VIDEO_V4L2_SUBDEV_API
>  	depends on X86
> -	select IOMMU_IOVA
> +	select IOMMU_IOVA if IOMMU_SUPPORT

This doesn't seem right: the ipu3-cio2 driver needs IOMMU_IOVA
independently of IOMMU_SUPPORT.

Looking at tegra-vde, it seems to depend on IOMMU_SUPPORT but that's not
declared in its Kconfig entry. I wonder if adding that would be the right
way to fix this.

Cc'ing the IOMMU list.

>  	select VIDEOBUF2_DMA_SG
>  	help
>  	  This is the Video4Linux2 driver for Intel IPU3 image processing unit,

-- 
Regards,

Sakari Ailus
sakari.ailus@...ux.intel.com