The deprecated attribute didn't work on versions of gcc older than 6,
but we now require version 7 or newer, so we don't need the macro any
more.
This change collapses the two uses of it in sim/aux_vector.hh, and marks
the macro as deprecated by extending the message string in the
underlying deprecated attribute.
Change-Id: I3bc9835ba19ad9534c7725e17a3558a749a94ca5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48514
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
The now standard [[nodiscard]] attribute can be used directly instead.
Unfortunately, I can't think of any way to actually mark the old macro
as deprecated, since it still has to expand to an attribute which
applies to the following function.
Change-Id: Icbbe3e3d182d845f289727724fef080722093683
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48510
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
It is possible from the MMU to traverse the entire hierarchy of
TLBs, starting from the DTB and ITB (generally speaking from the
first level) up to the last level via the nextLevel pointer. So
in theory no extra data should be stored in the BaseMMU.
This design makes some operations a bit more complex. For example
if we have a unified (I+D) L2, it will be pointed by both ITB and
DTB. If we want to invalidate all TLB entries, we should be
careful to not invalidate L2 twice, but if we simply follow the
next level pointer, we might do so. This is not a problem from
a functional perspective but alters the TLB statistics (a single
invalidation is recorded twice)
We then provide a different view of the set of TLBs in the system.
At the init phase we traverse the TLB hierarchy and we add every
TLB to the appropriate set. This makes invalidation (and any
operation targeting a specific kind of TLBs) easier.
JIRA: https://gem5.atlassian.net/browse/GEM5-790
Change-Id: Ieb833c2328e9daeaf50a32b79b970f77f3e874f7
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48146
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
This patch is moving most of the TLB code to the MMU.
In this way the TLB stops being the main translating agent and becomes a
simple "passive" translation cache.
All the logic behind virtual memory translation, like
* Checking permission/alignment
* Issuing page table walks
* etc
Is now embedded in the MMU model. This will allow us to stack multiple
TLBs and to compose arbitrary hierarchies as their sole purpose now is
to cache translations
JIRA: https://gem5.atlassian.net/browse/GEM5-790
Change-Id: I687c639a56263d5e3bb6633dd8c9666c85edba3a
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48141
Tested-by: kokoro <noreply+kokoro@google.com>
Now that we're using c++17, the type_traits with a ::value member have
a _v alias which reduces verbosity. Or on other words
std::is_integral<T>::value
can be replaced with
std::is_integral_v<T>
Make this substitution throughout the code base. In places where gem5
introduced it's own similar templates, add a V alias, spelled
differently to match gem5's internal style.
gem5: :IsVarArgs<T>::value => gem5::IsVarArgsV<T>
Change-Id: I1d84ffc4a236ad699471569e7916ec17fe5f109a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48604
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Memory space is not always outside of the CPU. For example the tightly
coupled memory (TCM) is inside of the core. To make gdb access those
kind of memory, we should use Iris memory API to read and write memory.
If we access a memory address not inside the CPU with Iris memory API.
The CPU would fire a request via amba transport_dbg. So the change also
covers the original behavior.
Change-Id: Ie223ab12f9a746ebafa21026a8680222f6ebd593
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45581
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
I don't have this header on one of the machines I build on, so this is
breaking the build for me. Removing this include seems to make the
build succeed, implying that it's not actually necessary. I looked at
the file it's used in and didn't see anything that looked like it came
from this header file.
Change-Id: If4a29063d6d0d25904183cab78c9713ff1f8daa6
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48603
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Currently, if the commit subject does have tags, the parser will
return the list of tags as a NoneType object, which will be
iterated later. This caused the gerrit bot to fail.
This change lets the parser return the list of tags as an empty
list rather than a NoneType object. Also, a commit subject without
a semicolon `:` will be assumed as having no tags and the whole
subject is the commit message.
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Change-Id: Ie8c90e14bb85c4ce1c583121d02e75aa87db7811
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48586
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
This implements the 96 and 128b ds_read/write instructions in a similar
fashion to the 3 and 4 dword flat_load/store instructions.
These instructions are treated as reads/writes of 3 or 4 dwords, instead
of as a single 96b/128b memory transaction, due to the limitations of
the VecOperand class used in the amdgpu code.
In order to handle treating the memory transaction as multiple dwords,
the patch also adds in new initMemRead/initMemWrite functions for ds
instructions. These are similar to the functions used in flat
instructions for the same purpose.
Change-Id: I0f2ba3cb7cf040abb876e6eae55a6d38149ee960
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48342
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alex Dutu <alexandru.dutu@amd.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Previously, we assumed that the maximum number of requests that would be
issued by an instruction was equal to the number of threads that were
active for that instruction.
However, if a thread has an access that crosses a cache line, that
thread has a misaligned access, and needs to request both cache lines.
This patch takes that into account by checking the status vector for
each thread in that instruction to determine the number of requests.
Change-Id: I1994962c46d504b48654dbd22bcd786c9f382fd9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48341
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Currently, we are storing coalesced accesses in
an std::unordered_map indexed by a tick index, i.e.
issue tick / coalescing window. If there are
multiple coalesced requests, at different tick
indexes, to the same virtual address, then the
TLB coalescer will issue just the first one.
However, std::unordered_map is not a sorted
container and we issue coalesced requests by iterating
through such container. This means that the coalesced
request sent in TLBCoalescer::processProbeTLBEvent is
not necessarly the oldest one. Because of this, in
cases of high contention the oldest coalesced request
will have a huge TLB access latency.
To fix this issue, we will use an std::map which is
a sorted container and therefore guarantees the
oldest coalesced request will be sent first.
Change-Id: I9c7ab32c038d5e60f6b55236266a27b0cae8bfb0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48340
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
The c++-17 feature "if constexpr" allows you to put code inside a normal
if which would normally have to be separated out using templates. The
condition of the if must be compile time evaluated, and the not-taken
path is discarded by the compiler.
Change-Id: I026381b2dbb140ef7f1b5cb23803782683ec419c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48503
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>
The proxies are not used on the critical path, and it's usually implicit
whether they should be the FS or SE version.
Ideally in the future we won't need to worry about which version we need
to use, but the differences haven't quite been abstracted away, and
occasionally we need to decide between the two.
Change-Id: Idb363d6ddc681f7c1ad5e7aba69865f40aa30dc8
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45907
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
The compiler is unhappy that one of the parameters in a call to sprintf
is also the buffer it's supposed to output to, when that parameter is
marked "restrict", which means it shouldn't alias to other arguments.
Also, this code can't go inside the gem5 namespace, since it has a
main() function in it. The linker will look for main(), not
gem5::main().
Change-Id: Ib17c601aefdc3e7201eba021dafb1c51204d54bc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48423
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>
These were never used with conditions, so the condition check just added
overhead. Also, the not-taken path through the instruction didn't
actually set the destination to something, meaning that it would set it
to something arbitrary and not actually leave it unmodified.
Change-Id: I33fef088979b14ad74adf22b26419a1cacf386dd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45305
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
This patch reverts part of the changes made by the removal of
the Stage2MMU class [1]:
Prior to that patch the stage1 and stage2 walkers were sharing
the same port (which was instantiated in the Stage2MMU).
By removing the Stage2MMU we provided every table walker a
unique port.
With this patch we are reintroducing port sharing to temporarily fix
existing platforms using walker caches.
(The long term design goal will be to have a unique page table walker)
Those complain if we try to connect a single ported cache to 2 table
walker ports (stage1 and stage2)
[1]: https://gem5-review.googlesource.com/c/public/gem5/+/45780
Change-Id: Ib68ef97f1e9772a698771269c9a4ec4514f5d4d7
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48200
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Currently, compiling CheckerCPU uses the dyn_inst.hh header from
O3CPU. However, including this header is not required and it
causes gem5 failed to build when O3CPU is not part of CPU_MODELS.
This change also involves moving the the dependency on
src/cpu/o3/dyn_inst.hh to src/cpu/o3/cpu.cc and src/cpu/lsq_unit.cc,
which previously includes src/cpu/o3/dyn_inst.hh implicitly through
src/cpu/checker/cpu.hh.
JIRA: https://gem5.atlassian.net/browse/GEM5-1025
Change-Id: I7664cd4b9591bf0a4635338fff576cb5f5cbfa10
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48079
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Certain DS insts are classfied as Loads, but don't actually go through
the memory pipeline. However, any instruction classified as a load
marks its destination registers as free in the memory pipeline.
Because these instructions didn't use the memory pipeline, they
never freed their destination registers, which led to a deadlock.
This patch explicitly calls the function used to free the destination
registers in the execute() method of those Load instructions that
don't use the memory pipeline.
Change-Id: Ic2ac2e232c8fbad63d0c62c1862f2bdaeaba4edf
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48019
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
