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GPU MTYPE is currently set using a global config passed to the PACoalescer. This patch enables MTYPE to be set by the shader on a per-request bases. In real hardware, the MTYPE is extracted from a GPUVM PTE during address translation. However, our current simulator only models x86 page tables which do not have the appropriate bits for GPU MTYPES. Rather than hacking non-x86 bits into our x86 page table models, this patch instead keeps an interval tree of all pages that request custom MTYPES in the driver itself. This is currently only used to map host pages to the GPU as uncacheable, but is easily extensible to other MTYPES. Change-Id: I7daab0ffae42084b9131a67c85cd0aa4bbbfc8d6 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42216 Maintainer: Matthew Poremba <matthew.poremba@amd.com> Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.