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This patch fixes some issues in the directory controller regarding DMA handling: 1) Junk data messages were being sent immediately in response to DMA reads for a line in the S state (one or more sharers, clean). Now, data is fetched from memory directly and forwarded to the device. Some existing transitions for handling GETS requests are reused, since it's essentially the same behavior (except we don't update the list of sharers for DMAs) 2) DMA writes for lines in the I or S states would always overwrite the whole line. We now check if it's only a partial line write, in which case we fetch the line from memory, update it, and writeback. 3) Fixed incorrect DMA msg size Some existing functions were renamed for clarity. Change-Id: I759344ea4136cd11c3a52f9eaab2e8ce678edd04 Signed-off-by: Tiago Mück <tiago.muck@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21926 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Pouya Fotouhi <pfotouhi@ucdavis.edu>
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.