This patch series adds support to the Intel Vulkan driver for the (currently provisional) VK_KHR_vulkan_memory_model extension. The extension provides a few extra SPIR-V decorations along with some additional guarantees about memory transaction ordering that aim to make better analysis and use of concurrency possible in Vulkan. In particular, it provides sufficient guarantees to allow for the creation and use of basic lock-free data structures in Vulkan shaders.
The current implementation does little more than rework the barrier code in the SPIR-V to NIR pass. This is mostly because NIR currently does little to no optimization on external memory access. As we begin to add more optimizations in this area, we will need to be careful to think about the Vulkan memory model to ensure that we continue to provide the right guarantees. It also points out just how awkward our current handling of barriers is in NIR. This series is sent out as an RFC at this point to make people aware of the extension and to get the discussion going on how we want to do things "for real". Also, as can be seen from patch 6, there's still a little work needed in the Intel back-end compiler to properly support this. :-) The series can be found on my gitlab: https://gitlab.freedesktop.org/jekstrand/mesa/commits/wip/VK_KHR_vulkan_memory_model Cc: Kenneth Graunke <kenn...@whitecape.org> Cc: Matt Turner <matts...@gmail.com> Cc: Francisco Jerez <curroje...@riseup.net> Cc: Timothy Arceri <tarc...@itsqueeze.com> Cc: Caio Marcelo de Oliveira Filho <caio.olive...@intel.com> Cc: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl> Jason Ekstrand (7): vulkan: Update the XML and headers to 1.1.84 spirv: Update Json and headers from Khronos GitHub master spirv/info: Add a memorymodel_to_string helper spirv: Insert barriers to follow the Vulkan memory model spirv: Add support for the Vulkan memory model HACK: Disable the instruction scheduler anv: Advertise support for VK_KHR_vulkan_memory_model include/vulkan/vulkan_core.h | 139 +++++++++- src/compiler/shader_info.h | 1 + src/compiler/spirv/spirv.core.grammar.json | 95 ++++++- src/compiler/spirv/spirv.h | 24 ++ src/compiler/spirv/spirv_info.h | 1 + src/compiler/spirv/spirv_info_c.py | 1 + src/compiler/spirv/spirv_to_nir.c | 190 +++++++++----- src/intel/compiler/brw_fs.cpp | 4 +- src/intel/vulkan/anv_device.c | 7 + src/intel/vulkan/anv_extensions.py | 1 + src/intel/vulkan/anv_pipeline.c | 1 + src/vulkan/registry/vk.xml | 280 ++++++++++++++++----- 12 files changed, 594 insertions(+), 150 deletions(-) -- 2.17.1 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
