linux-kernel - Re: [PATCH 1/1] drm/i915: remove unused IO_TLB_SEGPAGES which should be defined by swiotlb

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Date:   Tue, 21 May 2019 07:56:55 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Dongli Zhang <dongli.zhang@...cle.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        airlied@...ux.ie, daniel@...ll.ch, dongli.zhang@...cle.com
Subject: Re: [PATCH 1/1] drm/i915: remove unused IO_TLB_SEGPAGES which should be
 defined by swiotlb

Quoting Dongli Zhang (2019-05-21 05:40:39)
> This patch removes IO_TLB_SEGPAGES which is no longer used since
> commit 5584f1b1d73e ("drm/i915: fix i915 running as dom0 under Xen").
> 
> As the define of both IO_TLB_SEGSIZE and IO_TLB_SHIFT are from swiotlb,
> IO_TLB_SEGPAGES should be defined on swiotlb side if it is required in the
> future.

It would be wise to refer to

commit 5584f1b1d73e9cc95092734c316e467c6c4468f9
Author: Juergen Gross <jgross@...e.com>
Date:   Thu Feb 2 10:47:11 2017 +0100

    drm/i915: fix i915 running as dom0 under Xen

so the reader can have the history to trawl through.

References: 5584f1b1d73e ("drm/i915: fix i915 running as dom0 under Xen")
> Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris