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The SMMUv3SlaveInterface is using the xlateSlotsRemaining to model a limit on the number of translation requests it can receive from the master device. Patch https://gem5-review.googlesource.com/c/public/gem5/+/19308/2 moved the resource acquire/release inside the SMMUTranslationProcess constructor/destructor, for the sake of having a unique place for calling the signalDrainDone. While this is convenient, it breaks the original implementation, which was freeing resources AFTER a translation has completed, but BEFORE the final memory access (with the translated PA) is performed. In other words the xlateSlotsRemaining is only modelling translation slots and should be release once the PA gets produced. The patch fixes this mismatch by restoring the resource release in the right place (while keeping the acquire in the constructor) and by adding a pendingMemAccess counter, which is keeping track of a complete device memory request (translation + final access) and will be used by the draining logic Change-Id: I708fe2d0b6c96ed46f3f4f9a0512f8c1cc43a56c Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Adrian Herrera <adrian.herrera@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20260 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.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/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. 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/Dependencies 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 ALPHA, 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/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. 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. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.