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Message-ID: <c73bb650-7175-150b-a678-c707e5f0e7e7@kapsi.fi> Date: Thu, 11 Apr 2019 13:06:28 +0300 From: Mikko Perttunen <cyndis@...si.fi> To: Thierry Reding <thierry.reding@...il.com>, Ben Dooks <ben.dooks@...ethink.co.uk> Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org, digetx@...il.com, linux-tegra-owner@...r.kernel.org Subject: Re: [PATCH] gpu: host1x: fix compile error when IOMMU API is not available 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. Thanks, Mikko > > Thierry > >> >>> --- >>> drivers/gpu/host1x/hw/channel_hw.c | 2 +- >>> 1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/drivers/gpu/host1x/hw/channel_hw.c >>> b/drivers/gpu/host1x/hw/channel_hw.c >>> index 27101c04a827..4030d64916f0 100644 >>> --- a/drivers/gpu/host1x/hw/channel_hw.c >>> +++ b/drivers/gpu/host1x/hw/channel_hw.c >>> @@ -114,7 +114,7 @@ static inline void synchronize_syncpt_base(struct >>> host1x_job *job) >>> >>> static void host1x_channel_set_streamid(struct host1x_channel *channel) >>> { >>> -#if HOST1X_HW >= 6 >>> +#if IS_ENABLED(CONFIG_IOMMU_API) && HOST1X_HW >= 6 >>> struct iommu_fwspec *spec = >>> dev_iommu_fwspec_get(channel->dev->parent); >>> u32 sid = spec ? spec->ids[0] & 0xffff : 0x7f; >>> >>> _______________________________________________ >>> dri-devel mailing list >>> dri-devel@...ts.freedesktop.org >>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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