linux-kernel - Re: [PATCH 1/1] iommu/vtd: Cleanup dma

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Date:   Sat, 10 Nov 2018 00:35:06 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>, ashok.raj@...el.com,
        Christoph Hellwig <hch@...radead.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Sohil Mehta <sohil.mehta@...el.com>
Subject: Re: [PATCH 1/1] iommu/vtd: Cleanup dma_remapping.h header

On Sat, Nov 10, 2018 at 03:08:44PM +0800, Lu Baolu wrote:
> Commit e61d98d8dad00 ("x64, x2apic/intr-remap: Intel vt-d, IOMMU
> code reorganization") moved dma_remapping.h from drivers/pci/ to
> current place. It is entirely VT-d specific, but uses a generic
> name. This merges dma_remapping.h with include/linux/intel-iommu.h
> and removes dma_remapping.h as the result.

This looks fine to me, thanks for doing the work.

Reviewed-by: Christoph Hellwig <hch@....de>

> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> @@ -34,7 +34,7 @@
>  #include <drm/ttm/ttm_placement.h>
>  #include <drm/ttm/ttm_bo_driver.h>
>  #include <drm/ttm/ttm_module.h>
> -#include <linux/dma_remapping.h>
> +#include <linux/intel-iommu.h>

Btw, I don't think this driver has any business looking at Intel
IOMMU driver internals, and the code doing so is more than gross.

Not really your job, but vmw_dma_select_mode really needs a rewrite with
someone that has at least half a clue, and some taste.

Eventually we should also drop the intel_iommu_enabled export.