linux-kernel - Re: [PATCH 2/4] drm/vmwgfx: remove CONFIG_INTEL

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Message-ID: <91c7f07e5a8e7ad98e259c430934d92a58a558b6.camel@vmware.com>
Date:   Tue, 8 Jan 2019 10:55:16 +0000
From:   Thomas Hellstrom <thellstrom@...are.com>
To:     "hch@....de" <hch@....de>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Linux-graphics-maintainer <Linux-graphics-maintainer@...are.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH 2/4] drm/vmwgfx: remove CONFIG_INTEL_IOMMU ifdefs

Hi,


On Sat, 2019-01-05 at 09:01 +0100, Christoph Hellwig wrote:
...

> intel_iommu_enabled is defined as always false for
> !CONFIG_INTEL_IOMMU,
> so remove the ifdefs around it.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> 
> -#if !defined(CONFIG_SWIOTLB) && !defined(CONFIG_INTEL_IOMMU)
> -	/*
> -	 * No coherent page pool
> -	 */
> -	if (dev_priv->map_mode == vmw_dma_alloc_coherent)
> -		return -EINVAL;
> -#endif
> 

Actually this hunk is incorrect, it tries to determine whether the TTM
subsystem maintains a coherent page pool or not. If not, we can't use
vmw_dma_alloc_coherent.

/Thomas