linux-kernel - Re: [PATCH] drm/i915: stop using swiotlb

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Message-ID: <20220722095724.GA14113@lst.de>
Date:   Fri, 22 Jul 2022 11:57:24 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robert Beckett <bob.beckett@...labora.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, kernel@...labora.com,
        Christoph Hellwig <hch@....de>,
        Thomas Hellstrom <thomas.hellstrom@...el.com>,
        Matthew Auld <matthew.auld@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: stop using swiotlb

On Thu, Jul 21, 2022 at 06:43:07PM +0100, Robert Beckett wrote:
> +	max_segment = dma_max_mapping_size(i915->drm.dev);
> +	max_segment = max_t(size_t, max_segment, PAGE_SIZE) >> PAGE_SHIFT;

dma_max_mapping_size is always larger than PAGE_SIZE, so I don't think
the max is needed.

Otherwise this loks good:

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