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SubjectRe: [PATCH] [v2] gpu: host1x: avoid IOMMU_API build error
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On 6.3.2019 15.57, Arnd Bergmann wrote:
> When the iommu API is disabled, the host1x driver fails to build:
>
> 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
> drivers/gpu/host1x/hw/channel_hw.c:118:30: error: initialization of 'struct iommu_fwspec *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
> drivers/gpu/host1x/hw/channel_hw.c:119:23: error: 'struct iommu_fwspec' has no member named 'ids'
> u32 sid = spec ? spec->ids[0] & 0xffff : 0x7f;
> ^~
> cc1: all warnings being treated as errors
>
> As Mikko explains, we should program SMMU bypass (0x7f) if that
> happens.
>
> Fixes: de5469c21ff9 ("gpu: host1x: Program the channel stream ID")
> Suggested-by: Mikko Perttunen <mperttunen@nvidia.com>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ----
> v2: fall back to 0x7f sid
> ---
> drivers/gpu/host1x/hw/channel_hw.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/host1x/hw/channel_hw.c b/drivers/gpu/host1x/hw/channel_hw.c
> index 27101c04a827..0c0eb43abf65 100644
> --- a/drivers/gpu/host1x/hw/channel_hw.c
> +++ b/drivers/gpu/host1x/hw/channel_hw.c
> @@ -115,8 +115,12 @@ static inline void synchronize_syncpt_base(struct host1x_job *job)
> static void host1x_channel_set_streamid(struct host1x_channel *channel)
> {
> #if HOST1X_HW >= 6
> + u32 sid = 0x7f;
> +#ifdef CONFIG_IOMMU_API
> struct iommu_fwspec *spec = dev_iommu_fwspec_get(channel->dev->parent);
> - u32 sid = spec ? spec->ids[0] & 0xffff : 0x7f;
> + if (spec)
> + sid = spec->ids[0] & 0xffff;
> +#endif
>
> host1x_ch_writel(channel, sid, HOST1X_CHANNEL_SMMU_STREAMID);
> #endif
>

Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>

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