linux-kernel - Re: [PATCH 1/3] swiotlb: Export maximum allocation size

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Message-ID: <20190111091231.GB5825@8bytes.org>
Date:   Fri, 11 Jan 2019 10:12:31 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jfehlig@...e.com,
        jon.grimm@....com, brijesh.singh@....com, hch@....de,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 1/3] swiotlb: Export maximum allocation size

On Thu, Jan 10, 2019 at 12:02:05PM -0500, Konrad Rzeszutek Wilk wrote:
> Why not use swiotlb_nr_tbl ? That is how drivers/gpu/drm use to figure if they
> need to limit the size of pages.

That function just exports the overall size of the swiotlb aperture, no?
What I need here is the maximum size for a single mapping.

Regards,

	Joerg