linux-kernel - Re: [PATCH] gpu: host1x: fix compile error when IOMMU API is not available

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Date:   Thu, 11 Apr 2019 17:37:01 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Mikko Perttunen <cyndis@...si.fi>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        Stefan Agner <stefan@...er.ch>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-tegra-owner@...r.kernel.org
Subject: Re: [PATCH] gpu: host1x: fix compile error when IOMMU API is not
 available

On Thu, Apr 11, 2019 at 02:31:48PM +0300, Dmitry Osipenko wrote:
> 11.04.2019 13:06, Mikko Perttunen пишет:
> > On 11.4.2019 11.30, Thierry Reding wrote:
> >> On Thu, Apr 11, 2019 at 09:23:13AM +0100, Ben Dooks wrote:
> >>>
> >>>
> >>> On 2019-04-10 23:47, Stefan Agner wrote:
> >>>> In case the IOMMU API is not available compiling host1x fails with
> >>>> the following error:
> >>>>    In file included from drivers/gpu/host1x/hw/host1x06.c:27:
> >>>>    drivers/gpu/host1x/hw/channel_hw.c: In function
> >>>> ‘host1x_channel_set_streamid’:
> >>>>    drivers/gpu/host1x/hw/channel_hw.c:118:30: error: implicit
> >>>> declaration of function
> >>>>      ‘dev_iommu_fwspec_get’; did you mean ‘iommu_fwspec_free’?
> >>>> [-Werror=implicit-function-declaration]
> >>>>    struct iommu_fwspec *spec =
> >>>> dev_iommu_fwspec_get(channel->dev->parent);
> >>>>                                ^~~~~~~~~~~~~~~~~~~~
> >>>>                                iommu_fwspec_free
> >>>>
> >>>> Fixes: de5469c21ff9 ("gpu: host1x: Program the channel stream ID")
> >>>> Signed-off-by: Stefan Agner <stefan@...er.ch>
> >>>
> >>> would it be better to provide something like this i nthe header that
> >>> defines dev_iommu_fwspec_get() to be:
> >>>
> >>> static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
> >>> { return NULL; }
> >>>
> >>> although returning an PTR_ERR would have been better.
> >>
> >> I don't think there's really a large number of failures here. Either
> >> your device has an IOMMU fwspec or it doesn't.
> >>
> >> But yes, I think it'd be better to have the above static inline dummy in
> >> iommu.h, but I'll apply this for now in the hopes of getting it in
> >> before v5.1 final.
> > 
> > A similar patch was already sent before by someone. That one also programs the bypass stream ID (0x7f) even if IOMMU is disabled. We should pick that patch instead.
> 
> For the record.. here is that patch https://patchwork.ozlabs.org/patch/1052364/

Ugh... too late. I'll apply Arnd's patch on top of this one.

Thierry

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