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On Fri, Jan 12, 2018 at 10:40:16AM +0000, Chris Wilson wrote: > Quoting Thierry Reding (2018-01-11 22:22:46) > > From: Thierry Reding <treding at nvidia.com> > > > > This set of patches adds support for fences to Tegra DRM and complements > > the fence FD support for Nouveau. Technically this isn't necessary for a > > fence-based synchronization loop

...? > > Probably not, but if you don't need to force userspace to choose, they > will come up with a situation where it is useful. Though one thing to > consider with the drm_syncobj is that you will want to handle an array > of in/out fences, as userspace will pass in an array of VkSemaphore (or > whatever) rather than compute a singular dma_fence_array by merging. It's fairly unlikely that Tegra DRM will ever need to be able to deal with Vulkan (I'm not sure if the pre-Tegra124 GPU is capable of it). But you're right, might be a good idea to plan for this anyway since...

...ult of the job submission? Probably not, but if you don't need to force userspace to choose, they will come up with a situation where it is useful. Though one thing to consider with the drm_syncobj is that you will want to handle an array of in/out fences, as userspace will pass in an array of VkSemaphore (or whatever) rather than compute a singular dma_fence_array by merging. > For the above it would suffice to add two additional flags: > > #define DRM_TEGRA_SUBMIT_WAIT_SYNCOBJ (1 << 2) > #define DRM_TEGRA_SUBMIT_EMIT_SYNCOBJ (1 << 3) > > which wou...