netdev - Re: [PATCH 06/18] iommu/fsl_pamu: remove ->domain_window

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Date:   Thu, 1 Apr 2021 11:32:01 +0200
From:   Christoph Hellwig <hch@....de>
To:     Will Deacon <will@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Joerg Roedel <joro@...tes.org>,
        Li Yang <leoyang.li@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH 06/18] iommu/fsl_pamu: remove ->domain_window_enable

On Tue, Mar 30, 2021 at 01:40:09PM +0100, Will Deacon wrote:
> > +	ret = pamu_config_ppaace(liodn, geom->aperture_start,
> > +				 geom->aperture_end - 1, ~(u32)0,
> 
> You're passing 'geom->aperture_end - 1' as the size here, but the old code
> seemed to _add_ 1:
> 

> > -	win_size = (domain->geometry.aperture_end + 1) >> ilog2(1);
> 
> here ^^ when calculating the exclusive upper bound. In other words, I think
> '1ULL << 36' used to get passed to pamu_config_ppaace(). Is that an
> intentional change?

No, I've fixed it up.