gem5.git
7 years agomem: Remove the unused asid field from the CacheBlk class
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:45 +0000 (14:14 +0000)]
mem: Remove the unused asid field from the CacheBlk class

Change-Id: I29f45733c5fad822bdd0d8dcc7939d86b2e8c97b
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Remove unused arguments (asid/contex_id) from accessBlock
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Remove unused arguments (asid/contex_id) from accessBlock

Change-Id: I79c2662fc81630ab321db8a75be6cd15fa07d372
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Remove unused type BlkList from the cache and the tags
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Remove unused type BlkList from the cache and the tags

Change-Id: If9ebb8488e8db587482ecfa99d2c12cfe5734fb9
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Remove unused functions from the tag classes
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Remove unused functions from the tag classes

Change-Id: I4f3c2c027b1acaaf791a4c71086f34a9b9fbf4df
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Always use the helper function to invalidate a block
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Always use the helper function to invalidate a block

Policies like the LRU need to be notified when a block is invalidated,
the helper function does this along with invalidating the block.

Change-Id: I3ed59cf07938caa7f394ee6054b0af9e00b267ea
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Fix MSHR assert triggering for invalidated prefetches
Sascha Bischoff [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Fix MSHR assert triggering for invalidated prefetches

This changeset updates an assert in src/mem/cache/mshr.cc which was
erroneously catching invalidated prefetch requests. These requests can
become invalidated if another component writes (an exclusive access)
to this location during the time that the read request is in
flight. The original assert made the assumption that these cases can
only occur for reads generated by the CPU, and hence
prefetcher-generated requests would sometimes trip the assert.

Change-Id: If4f043273a688c2bab8f7a641192a2b583e7b20e
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Populate the secure flag in the writeback visitor
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Populate the secure flag in the writeback visitor

Previously the writeback visitor would not consider and set the secure
flag for the blocks that are written back to memory. This patch fixes
this.

Change-Id: Ie1a425fa9211407a70a4343f2c6b3d073371378f
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomisc: Add dtb files to the ignore list for git and mercurial
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
misc: Add dtb files to the ignore list for git and mercurial

Change-Id: Ifb135c60e050c55769914e853b07a387c06e4007
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Remove stale argument from a panic statement
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
mem: Remove stale argument from a panic statement

Change-Id: I7ae5fa44a937f641a2ddd242a49e0cd23f68b9f2
Reviewed-by: Sudhanshu Jha <sudhanshu.jha@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm: Fix DPRINTFs with arguments in the instruction declarations
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
arm: Fix DPRINTFs with arguments in the instruction declarations

Change-Id: I0e373536897aa5bb4501b00945c2a0836100ddf4
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm: Blame the right instruction address on a Prefetch Abort
Nikos Nikoleris [Tue, 21 Feb 2017 14:14:44 +0000 (14:14 +0000)]
arm: Blame the right instruction address on a Prefetch Abort

CPU models (e.g., O3CPU) issue instruction fetches for the whole cache
block rather than a specific instruction. Consequently the TLB lookups
translate the cache block virtual address. When the TLB lookup fails,
however, the Prefetch Abort must be raised for the PC of the
instruction that caused the fault rather than for the address of the
block.

This change fixes the way we instantiate the PrefetchAbort faults to
use the PC of the request rather the address of the instruction fetch
request.

Change-Id: I8e45549da1c3be55ad204a060029c95ce822a851
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Rekai Gonzalez Alberquilla <rekai.gonzalezalberquilla@arm.com>
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agostats: Get all stats updated to reflect current behaviour
Andreas Hansson [Sun, 19 Feb 2017 10:30:32 +0000 (05:30 -0500)]
stats: Get all stats updated to reflect current behaviour

Line everything up again.

7 years agosim: Ensure draining is deterministic
Andreas Hansson [Sun, 19 Feb 2017 10:30:31 +0000 (05:30 -0500)]
sim: Ensure draining is deterministic

The traversal of drainable objects could potentially be
non-deterministic when using an unordered set containing object
pointers. To ensure that the iteration is deterministic, we switch to
a vector. Note that the lookup and traversal of the drainable objects
is not performance critical, so the change has no negative consequences.

7 years agomem: Ensure deferred snoops are cache-line aligned
Andreas Hansson [Sun, 19 Feb 2017 10:30:31 +0000 (05:30 -0500)]
mem: Ensure deferred snoops are cache-line aligned

This patch fixes a bug where a deferred snoop ended up being to a
partial cache line, and not cache-line aligned, all due to how we copy
the packet.

7 years agomem: Fix memory footprint includes
Andreas Hansson [Sun, 19 Feb 2017 10:30:31 +0000 (05:30 -0500)]
mem: Fix memory footprint includes

Fix compilation errors due to missing include.

7 years agosyscall_emul: [patch 10/22] refactor fdentry and add fdarray class
Brandon Potter [Wed, 9 Nov 2016 20:27:42 +0000 (14:27 -0600)]
syscall_emul: [patch 10/22] refactor fdentry and add fdarray class

Several large changes happen in this patch.

The FDEntry class is rewritten so that file descriptors now correspond to
types: 'File' which is normal file-backed file with the file open on the
host machine, 'Pipe' which is a pipe that has been opened on the host machine,
and 'Device' which does not have an open file on the host yet acts as a pseudo
device with which to issue ioctls. Other types which might be added in the
future are directory entries and sockets (off the top of my head).

The FDArray class was create to hold most of the file descriptor handling
that was stuffed into the Process class. It uses shared pointers and
the std::array type to hold the FDEntries mentioned above.

The changes to these two classes needed to be propagated out to the rest
of the code so there were quite a few changes for that. Also, comments were
added where I thought they were needed to help others and extend our
DOxygen coverage.

7 years agosyscall_emul: [patch 9/22] remove unused global variable (num_processes)
Brandon Potter [Wed, 9 Nov 2016 20:27:42 +0000 (14:27 -0600)]
syscall_emul: [patch 9/22] remove unused global variable (num_processes)

7 years agosyscall_emul: [patch 8/22] refactor process class
Brandon Potter [Wed, 9 Nov 2016 20:27:41 +0000 (14:27 -0600)]
syscall_emul: [patch 8/22] refactor process class

Moves aux_vector into its own .hh and .cc files just to get it out of the
already crowded Process files. Arguably, it could stay there, but it's
probably better just to move it and give it files.

The changeset looks ugly around the Process header file, but the goal here is
to move methods and members around so that they're not defined randomly
throughout the entire header file. I expect this is likely one of the reasons
why I several unused variables related to this class. So, the methods are
declared first followed by members. I've tried to aggregate them together
so that similar entries reside near one another.

There are other changes coming to this code so this is by no means the
final product.

7 years agosyscall_emul: [patch 7/22] remove numCpus method
Brandon Potter [Wed, 9 Nov 2016 20:27:41 +0000 (14:27 -0600)]
syscall_emul: [patch 7/22] remove numCpus method

The numCpus method is misleading in that it's not really a measure of
how many CPUs might be executing a process, but how many thread contexts
are assigned to the process at any given point in time.

It's nice to highlight this distinction because thread contexts are never
reused in the same way that a CPU can be reused for multiple processes.
The reason that there is no reuse is that there is no CPU scheduler for SE.

The tru64 code intends to use this method and the accompanying contextIDs
field to support SMT and track the number of threads with some system calls.
With the up coming clone and exec patches, this paradigm must change. There
needs to be a 1:1 mapping between the thread contexts and processes so that
the process state between threads is allowed to vary when needed by Linux.
This should not break SMT for tru64 if the Process class is refactored so that
multiple Processes can share state between themselves. The following patches
will do the refactoring incrementally as features are added.

7 years agosyscall_emul: [patch 6/22] remove unused fields from Process class
Brandon Potter [Wed, 9 Nov 2016 20:27:41 +0000 (14:27 -0600)]
syscall_emul: [patch 6/22] remove unused fields from Process class

It looks like tru64 has some nxm* system calls, but the two fields that
are defined in the Process class are unused by any of the code. There doesn't
appear to be any reference in the tru64 code.

7 years agosyscall_emul: [patch 5/22] remove LiveProcess class and use Process instead
Brandon Potter [Wed, 9 Nov 2016 20:27:40 +0000 (14:27 -0600)]
syscall_emul: [patch 5/22] remove LiveProcess class and use Process instead

The EIOProcess class was removed recently and it was the only other class
which derived from Process. Since every Process invocation is also a
LiveProcess invocation, it makes sense to simplify the organization by
combining the fields from LiveProcess into Process.

7 years agosparc: fix bugs caused by cd7f3a1dbf55
Brandon Potter [Fri, 17 Feb 2017 17:01:51 +0000 (12:01 -0500)]
sparc: fix bugs caused by cd7f3a1dbf55

Turns out that SPARC SE mode relied on M5_pid being "0" in
all cases. The entries in the SPARC TLBs are accessed with
M5_pid as their context. This is buggy in the sense that it
will never work with more than one process or any
initialization that doesn't have the M5_pid value passed in
as "0".

cd7f3a1dbf55 broke the SPARC build because it deletes M5_pid
and uses a _pid with a default of "100" instead. This caused
the SPARC TLB to never return any valid lookups for any
request; the program never moved past the first instruction
with SPARC SE in the regression tester.

The solution proposed in this changeset is to initialize
the address space identification register with the PID value
that is passed into the process class as a parameter from
Python. This should return the correct responses from the TLB
since the insertions and lookups into the page table will be
using the same PID.

Furthermore, there are corner cases in the code which elevate
privileges and revert to using context "0" as the context in
the TLB. I believe that these are related to kernel level
traps and hypervisor privilege escalations, but I'm not
completely sure. I've tried to address the corner cases
properly, but it would be beneficial to have someone who is
familiar with the SPARC architecture to take a look at this
fix.

7 years agosim: fix out-of-bounds error in syscall_desc
Brandon Potter [Fri, 17 Feb 2017 17:01:50 +0000 (12:01 -0500)]
sim: fix out-of-bounds error in syscall_desc

7 years agomem, stats: fix typos in CommMonitor and Stats
Pierre-Yves Péneau [Wed, 15 Feb 2017 20:59:06 +0000 (14:59 -0600)]
mem, stats: fix typos in CommMonitor and Stats

Signed-off-by: Pierre-Yves Péneau <pierre-yves.peneau@lirmm.fr>
Reviewed-by: Tony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed at http://reviews.gem5.org/r/3802/

7 years agomem, misc: fix building issue with CommMonitor (unused variables)
Pierre-Yves Péneau [Wed, 15 Feb 2017 20:56:54 +0000 (14:56 -0600)]
mem, misc: fix building issue with CommMonitor (unused variables)

Signed-off-by: Pierre-Yves Péneau <pierre-yves.peneau@lirmm.fr>
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed at http://reviews.gem5.org/r/3801/

7 years agomem: fix assertion in respondEvent
Wendy Elsasser [Wed, 15 Feb 2017 15:28:44 +0000 (09:28 -0600)]
mem: fix assertion in respondEvent

Assertion in the respondEvent erroneously fired.
The assertion verifies that the controller has not moved to a low-power
state prior to receiving read data from the memory.
The original assertion triggered if the state was not:
PWR_IDLE or PWR_ACT.

In the case that failed, a periodic refresh event occurred around the
read.  The REF is stalled until the final read burst is issued
and the subsequent PRE closes the bank.  While the PRE will temporarily
move the state to PWR_IDLE, state will immediately transition to PWR_REF
due to the pending refresh operation.  This state does not match the
assertion, which is subsequently triggered.

Fixed the assertion by explicitly checking that the state is not a low
power state
!PWR_SREF && !PWR_PRE_PDN && !PWR_ACT_PDN

Change-Id: I82921a733bbeac2bcb5a487c2f981448d41ed50b
Reviewed-by: Radhika Jagtap <radhika.jagtap@arm.com>
7 years agoarm,config: Add dist-gem5 support to the big.LITTLE(tm) config
Gabor Dozsa [Tue, 14 Feb 2017 21:36:15 +0000 (15:36 -0600)]
arm,config: Add dist-gem5 support to the big.LITTLE(tm) config

This patch extends the example big.LITTLE configuration to enable
dist-gem5 simulations of big.LITTLE systems.

Change-Id: I49c095ab3c737b6a082f7c6f15f514c269217756
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoconfig: Refactor the network switch configuration file
Gabor Dozsa [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
config: Refactor the network switch configuration file

This patch prevents the body of the script getting executed when
the script is imported as a module.

Change-Id: I70a50f6295f1e7a088398017f5fa9d06fe90476a
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm,config: Refactor the example big.LITTLE(tm) configuration
Gabor Dozsa [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
arm,config: Refactor the example big.LITTLE(tm) configuration

This patch prepares future extensions and customisation of the example
big.LITTLE configuration script. It breaks out the major phases into
functions so they can be called from other python scripts.

Change-Id: I2cb7c207c410fe14602cf17af7482719abba6c24
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm, kvm: remove KvmGic
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
arm, kvm: remove KvmGic

KvmGic functionality has been subsumed within the new MuxingKvmGic
model, which has Pl390 fallback when not using KVM for fast emulation.
This simplifies configuration and will enable checkpointing between
KVM emulation and full-system simulation.

Change-Id: Ie61251720064c512843015c075e4ac419a4081e8
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm, kvm: Automatically use the MuxingKvmGic
Andreas Sandberg [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
arm, kvm: Automatically use the MuxingKvmGic

Automatically use the MuxingKvmGic in the VExpress_GEM5_V1
platform. This removes the need to patch the host kernel or the
platform configuration when using KVM on ARM.

Change-Id: Ib1ed9b3b849b80c449ef1b62b83748f3f54ada26
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
7 years agoarm, kvm: implement MuxingKvmGic
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
arm, kvm: implement MuxingKvmGic

This device allows us to, when KVM support is detected and compiled in,
instantiate the same Gic device whether the actual simulation is with
KVM cores or simulated cores.  Checkpointing is not yet supported.

Change-Id: I67e4e0b6fb7ab5058e52c933f4f3d8e7ab24981e
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agosim, kvm: make KvmVM a System parameter
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
sim, kvm: make KvmVM a System parameter

A KVM VM is typically a child of the System object already, but for
solving future issues with configuration graph resolution, the most
logical way to keep track of this object is for it to be an actual
parameter of the System object.

Change-Id: I965ded22203ff8667db9ca02de0042ff1c772220
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agosim,kvm,arm: fix typos
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
sim,kvm,arm: fix typos

Change-Id: Ifc65d42eebfd109c1c622c82c3c3b3e523819e85
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agomem: Update DRAM configuration names
Wendy Elsasser [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
mem: Update DRAM configuration names

Names of DRAM configurations were updated to reflect both
the channel and device data width.

Previous naming format was:
<DEVICE_TYPE>_<DATA_RATE>_<CHANNEL_WIDTH>

The following nomenclature is now used:
<DEVICE_TYPE>_<DATA_RATE>_<n>x<w>
where n = The number of devices per rank on the channel
      x = Device width

Total channel width can be calculated by n*w

Example:
A 64-bit DDR4, 2400 channel consisting of 4-bit devices:
n = 16
w = 4
The resulting configuration name is:
DDR4_2400_16x4

Updated scripts to match new naming convention.

Added unique configurations for DDR4 for:
1) 16x4
2) 8x8
3) 4x16

Change-Id: Ibd7f763b7248835c624309143cb9fc29d56a69d1
Reviewed-by: Radhika Jagtap <radhika.jagtap@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
7 years agotests: check for gem5 binary before tests
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
tests: check for gem5 binary before tests

Provides a helpful error when tests.py is invoked without the gem5 binary.

Before:
Running 0 tests

After:
gem5 binary 'quick/...' not an executable file

Change-Id: I1566802206c9e21ca89bd03e91db22844168a085
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agosim: allow forward dependencies in checkpoint upgraders
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
sim: allow forward dependencies in checkpoint upgraders

The notion of forward dependencies is just expressing the same
dependency but at the other end of the dependency edge, i.e. at
the dependee rather than the depender.  As there is no more
'power' here, it's strictly a convenience feature for handling
dependencies with tags that are not in the upstream repository.

Change-Id: Ic7c68de6aff4094aaa12de62cdf690a5dc65ccb5
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agosim: add support for checkpoint downgrading
Curtis Dunham [Tue, 14 Feb 2017 21:09:18 +0000 (15:09 -0600)]
sim: add support for checkpoint downgrading

This commit supports the use case of transitioning tags and their
associated checkpoint rewrites out of use for whatever reason.  Just
replace the upgrader() method with a downgrader() method that performs
the appropriate inverse operation.

The tag name is still used, but only in this negative, 'zombie' state,
as it will be removed from the tags in the checkpoint and gem5 binary.

Change-Id: If9d26cccfe8449e026762b1a72f0c2ae5a9cf2d7
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoriscv: Remove ECALL tests from insttest
Alec Roelke [Mon, 13 Feb 2017 20:26:05 +0000 (14:26 -0600)]
riscv: Remove ECALL tests from insttest

The system calls tested in rv64i.cpp in RISC-V's insttest suite have
different behavior depending on the operating system and file system they
are run on. This patch ignores the output of those tests and only
ensures that the instructions in RV64I complete successfully.

[Change deletion of ECALL test to block comment.]
[Restore ECALL test but remove test output to test only for completion
without error.]
[Update patch description and again try to push EMPTY files for rv64i
tests.]

7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [6/10]
Christian Menard [Mon, 13 Feb 2017 20:25:16 +0000 (14:25 -0600)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [6/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Update the README

7 years agoruby: fix round robin arbiter in garnet2.0
Tushar Krishna [Sun, 12 Feb 2017 20:00:03 +0000 (15:00 -0500)]
ruby: fix round robin arbiter in garnet2.0
The rr arbiter pointer in garnet was getting updated on every request,
even if there is no grant. This was leading to a huge variance in wait
time at a router at high injection rates.
This patch corrects it to update upon a grant.

7 years agomem: fix printing of 1st cache tags line
Bjoern A. Zeeb [Sat, 11 Feb 2017 16:11:48 +0000 (11:11 -0500)]
mem: fix printing of 1st cache tags line

Rather than having the 1st line on the Log line and every other line on its
own, add a new line to have a common format for all of them.  Makes parsing
a lot easier.

Reviewed at http://reviews.gem5.org/r/3808/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agox86: Fix implicit stack addressing in 64-bit mode
Jason Lowe-Power [Fri, 10 Feb 2017 16:19:34 +0000 (11:19 -0500)]
x86: Fix implicit stack addressing in 64-bit mode

When in 64-bit mode, if the stack is accessed implicitly by an instruction
the alternate address prefix should be ignored if present.

This patch adds an extra flag to the ldstop which signifies when the
address override should be ignored. Then, for all of the affected
instructions, this patch adds two options to the ld and st opcode to use
the current stack addressing mode for all addresses and to ignore the
AddressSizeFlagBit.  Finally, this patch updates the x86 TLB to not
truncate the address if it is in 64-bit mode and the IgnoreAddrSizeFlagBit
is set.

This fixes a problem when calling __libc_start_main with a binary that is
linked with a recent version of ld. This version of ld uses the address
override prefix (0x67) on the call instruction instead of a nop.

Note: This has not been tested in compatibility mode and only the call
instruction with the address override prefix has been tested.

See [1] page 9 (pdf page 45)

For instructions that are affected see [1] page 519 (pdf page 555).

[1] http://support.amd.com/TechDocs/24594.pdf

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Update #!env calls for python to explicit version
Jason Lowe-Power [Fri, 10 Feb 2017 15:00:18 +0000 (10:00 -0500)]
misc: Update #!env calls for python to explicit version

In some newer Linux distributions, env python default to Python 3.0. This
patch explicitly uses "python2" instead of just "python" for all scripts
that use #!

Reported-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Add Python.h header to pyevents.hh
Jason Lowe-Power [Fri, 10 Feb 2017 15:00:18 +0000 (10:00 -0500)]
misc: Add Python.h header to pyevents.hh

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [10/10]
Christian Menard [Fri, 10 Feb 2017 00:15:51 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [10/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
  * Add callbacks for the Gem5SimControl that are called at before and
  * after simulate()

Reviewed at http://reviews.gem5.org/r/3799/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [9/10]
Christian Menard [Fri, 10 Feb 2017 00:15:48 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [9/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
  * Pay for the header delay that the gem5 XBar annotates to packets.

Reviewed at http://reviews.gem5.org/r/3798/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [8/10]
Christian Menard [Fri, 10 Feb 2017 00:15:46 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [8/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
  * bugfix: The BEGIN_RESP also needs to be handled when END_REQ was
  * skipped
    and '&trans == blockingRequest && phase == tlm::BEGIN_RESP'
evaluates to true.

Reviewed at http://reviews.gem5.org/r/3797/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [7/10]
Christian Menard [Fri, 10 Feb 2017 00:15:43 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [7/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Implement 'pipe through' for gem5 Packets (see explanation below)

Basically, this patch ensures that all transactions that originated in the
gem5 world are converted back to the original packet when entering the gem5
world.  So far, this only worked for packets that are responded to by a
SyctemC component (e.g. when a gem5 CPU sends a request to a SystemC
memory). By implementing the 'pipe through' this patch ensures, that
packets that are responded to by a gem5 component (e.g. when a gem5 CPU
sends a request to a gem5 memory via a SystemC interconnect) are handled
properly.

Reviewed at http://reviews.gem5.org/r/3796/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [5/10]
Christian Menard [Fri, 10 Feb 2017 00:15:41 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [5/10]

Changeset 11798:3a490c57058d
---------------------------
misc: Clean up and complete the gem5<->SystemC-TLM bridge [5/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Introduce transactor modules that represent the gem5 ports in the
 * SystemC world.
 * Update the SimControl module and let it keep track of the gem5 ports.

Reviewed at http://reviews.gem5.org/r/3775/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [4/10]
Christian Menard [Fri, 10 Feb 2017 00:15:38 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [4/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Move common code of the example to a common directory.  Move the cli
 * parsing from the SimControl module to a separate example object.  Add
 * comments describing the Gem5SimControl module.

Testing Done: Examples compile and run.

Reviewed at http://reviews.gem5.org/r/3695/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [3/10]
Christian Menard [Fri, 10 Feb 2017 00:15:35 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [3/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Simplify the Slave Port by using a simple_initiator_socket.

Testing Done: Example applications are still running.

Reviewed at http://reviews.gem5.org/r/3686/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [2/10]
Christian Menard [Fri, 10 Feb 2017 00:15:33 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [2/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Add the Master Port.  Add an example application that isslustrates its
 * use.

Testing Done: A simple example application consisting of a TLM traffic
generator and a gem5 memory is part of the patch.

Reviewed at http://reviews.gem5.org/r/3528/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Clean up and complete the gem5<->SystemC-TLM bridge [1/10]
Christian Menard [Fri, 10 Feb 2017 00:15:30 +0000 (19:15 -0500)]
misc: Clean up and complete the gem5<->SystemC-TLM bridge [1/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Restructure the existing sources in preparation of the addition of the
 * new
   Master Port.
 * Refractor names to allow for distinction of the slave and master port.
 * Replace the Makefile by a SConstruct.

Testing Done: The examples provided in util/tlm (now
util/tlm/examples/slave_port) still compile and run error free.

Reviewed at http://reviews.gem5.org/r/3527/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: add a MasterId to the ExternalPort
Christian Menard [Fri, 10 Feb 2017 00:14:58 +0000 (19:14 -0500)]
misc: add a MasterId to the ExternalPort

The Request constructor requires a MasterID. However, an external
transactor has no chance of getting a MasterID as it does not have a
pointer to the System. This patch adds a MasterID to ExternalMaster to
allow external modules to easily genrerate new Requests.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: fix includes in util/systemc
Christian Menard [Fri, 10 Feb 2017 00:11:29 +0000 (19:11 -0500)]
misc: fix includes in util/systemc

This fixes compilation errors with clang on OS X.

Reviewed at http://reviews.gem5.org/r/3807/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Fix order of object construction in the CxxConfigManager
Christian Menard [Fri, 10 Feb 2017 00:11:23 +0000 (19:11 -0500)]
misc: Fix order of object construction in the CxxConfigManager

The CxxConfigManager schould create objects by traversing the object tree
starting from the root object. However, currently objects are created in
aplphabetical order, which only works if the root object alphabetically
comes before any system object (e.g. 'root' < 'system'. Otherwise (e.g.
'a_system' < 'root'), object construction may fail. The reason for this
behaviour is, that the call to findObject() in the sorting code also
constructs the object if it is not yet existent. Then findTraversalOrder()
calls findObject("root") and subseqeuently calls findObject() on all the
children, and so on. However, the call to findTraversalOrder() is
redundant, since all objects are already created in alphabetical order.
This patch simply removes the alphabetical ordering, leading to the objects
being created starting from 'root'.

Reviewed at http://reviews.gem5.org/r/3778/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Implement the Base SystemC Module as an sc_channel.
Christian Menard [Fri, 10 Feb 2017 00:10:25 +0000 (19:10 -0500)]
misc: Implement the Base SystemC Module as an sc_channel.

Implementing the Module as an sc_channel allows derived classes to provide
SystemC interfaces. Other SystemC modules can connect to these interfaces.
This meachanism can be used to control gem5 and acces gem5 components from
within arbitrary SystemC moduels. Since sc_channel is derived from
sc_module, this patch does not break compatibility with existing code.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agosim: fix build breakage in process.cc after brandon@11801
Bjoern A. Zeeb [Fri, 10 Feb 2017 00:03:58 +0000 (19:03 -0500)]
sim: fix build breakage in process.cc after brandon@11801

Seeing build breakage after brandon@11801:

 [     CXX] X86/sim/process.cc -> .o build/X86/sim/process.cc:137:64:
error: field '_pid' is uninitialized when used here
[-Werror,-Wuninitialized] static_cast<PageTableBase *>(new
ArchPageTable(name(), _pid, system)) : ^ build/X86/sim/process.cc:138:64:
error: field '_pid' is uninitialized when used here
[-Werror,-Wuninitialized] static_cast<PageTableBase *>(new
FuncPageTable(name(), _pid))), ^ 2 errors generated.

Testing Done: Compiles now on FreeBSD 10 with clang.

Reviewed at http://reviews.gem5.org/r/3804/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agosim: Patch to fix the statfs build
Bjoern A. Zeeb [Fri, 10 Feb 2017 00:03:55 +0000 (19:03 -0500)]
sim: Patch to fix the statfs build

See developers mailing list.  Trying to unbreak statfs.

Testing Done:
Builds on FreeBSD now.

Reviewed at http://reviews.gem5.org/r/3803/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agoscons: make build better on FreeBSD
Bjoern A. Zeeb [Fri, 10 Feb 2017 00:00:00 +0000 (19:00 -0500)]
scons: make build better on FreeBSD

Various changes we found needed to build gem5 successfully on
FreeBSD.

Reviewed at http://reviews.gem5.org/r/3378/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agodev: net/i8254xGBe add two more wakeup registers to ignore
Bjoern A. Zeeb [Thu, 9 Feb 2017 23:59:55 +0000 (18:59 -0500)]
dev: net/i8254xGBe add two more wakeup registers to ignore

There are drivers writing to WUFC uncondtionally of anything.  In order to
not panic gem5 in these cases, ignore writes to WUFC and WUS as we do for
WUC.  Similarly return 0 (default reset value) on reads.

Testing Done: Booted in FS with such a driver revision which would
previously panic and now boots fine.

Reviewed at http://reviews.gem5.org/r/3791/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agoarm: AArch64 report cache size correctly when reading CTR_EL0
Bjoern A. Zeeb [Thu, 9 Feb 2017 23:54:28 +0000 (18:54 -0500)]
arm: AArch64 report cache size correctly when reading CTR_EL0

Trying to read MISCREG_CTR_EL0 on AArch64 returned 0 as is was not
implmemented.  With that an operating system relying on the cache line
sizes reported in order to manage the caches would (a) panic given the
returned value 0 is not valid (high bit is RES1) or (b) worst case would
assume a cache line size of 4 doing a tremendous amount of extra
instruction work (including fetching).  Return the same values as for ARMv7
as the fields seem to be the same, or RES0/1 seem to be reported
accordingly for AArch64

In collaboration with:  Andrew Turner

Testing Done: Checked on FreeBSD boots with extra printfs;  also observed a
reduction of a factor of about 10 in instruction fetches for a simple
micro-test.

Reviewed at http://reviews.gem5.org/r/3667/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agostyle: Force Python.h to be included before main header
Andreas Sandberg [Tue, 7 Feb 2017 15:28:33 +0000 (15:28 +0000)]
style: Force Python.h to be included before main header

Python's header files set various compiler macros (e.g.,
_XOPEN_SOURCE) unconditionally. This triggers preprocessor warnings
that end up being treated as errors. The Python integration manual [1]
strongly recommends that Python.h is included before any system
header. The style guide used to mandate that Python.h is included
first in any file that needs it. This requirement was changed to
always include a source file's main header first, which ended up
triggering these errors.

This change updates the style checker to always include Python.h
before the main header file.

[1] https://docs.python.org/2/extending/extending.html

Change-Id: Id6a4f7fc64a336a8fd26691a0ca682abeb1d1579
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Pierre-Yves Péneau <pierre-yves.peneau@lirmm.fr>
7 years agoproto: Fix warnings for protoc v3
Nikos Nikoleris [Fri, 27 Jan 2017 21:07:20 +0000 (15:07 -0600)]
proto: Fix warnings for protoc v3

protoc v3 introduces a new syntax for proto files and warns when the
syntax is not explicitly stated.

protoc relies on the fact that undefined preprocessor symbols are
explanded to 0 but since we use -Wundef they end up generating
warnings.

Change-Id: If07abeb54e932469c8f2c4d38634a97fdae40f77
Reviewed-by: Andreas Hansson <andreas.hansson@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agoriscv: Fix crash when syscall argument reg index is too high
Alec Roelke [Fri, 27 Jan 2017 21:05:01 +0000 (15:05 -0600)]
riscv: Fix crash when syscall argument reg index is too high

By default, doSyscall gets the values of six registers to be used for
system call arguments.  RISC-V, by convention, only has four.  Because
RISC-V's implementation of these indices is as arrays of integers rather
than as base indices plus offsets, trying to get the fifth argument
register's value will cause a crash.  This patch fixes that by returning 0
for any index higher than 3.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Add support for switching multiple cores in SystemC
Paul Rosenfeld [Fri, 27 Jan 2017 21:03:17 +0000 (15:03 -0600)]
misc: Add support for switching multiple cores in SystemC

This patch adds a '-n' flag to the gem5 SystemC driver which allows
multiple CPUs to be switched out to a new CPU. Primarily this involves
appending CPU numbers to the objects searched for in the config
manager if there are multiple CPUs in the system.

Note that an equivalent change should be made to the util/cxx_config driver,
but I wanted to get input on this first before making the same change over
there

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomem: Refactor CommMonitor stats, add basic atomic mode stats
Rahul Thakur [Fri, 27 Jan 2017 20:58:16 +0000 (14:58 -0600)]
mem: Refactor CommMonitor stats, add basic atomic mode stats

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomem: Add memory footprint probe
Rahul Thakur [Fri, 27 Jan 2017 20:58:15 +0000 (14:58 -0600)]
mem: Add memory footprint probe

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agopython: Move native wrappers to the _m5 namespace
Andreas Sandberg [Fri, 27 Jan 2017 12:40:01 +0000 (12:40 +0000)]
python: Move native wrappers to the _m5 namespace

Swig wrappers for native objects currently share the _m5.internal name
space with Python code. This is undesirable if we ever want to switch
from Swig to some other framework for native binding (e.g., PyBind11
or Boost::Python). This changeset moves all of such wrappers to the
_m5 namespace, which is now reserved for native code.

Change-Id: I2d2bc12dbc05b57b7c5a75f072e08124413d77f3
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
7 years agosyscall_emul: [patch 4/22] remove redundant M5_pid field from process
Brandon Potter [Wed, 9 Nov 2016 20:27:40 +0000 (14:27 -0600)]
syscall_emul: [patch 4/22] remove redundant M5_pid field from process

7 years agostyle: [patch 3/22] reduce include dependencies in some headers
Brandon Potter [Wed, 9 Nov 2016 20:27:40 +0000 (14:27 -0600)]
style: [patch 3/22] reduce include dependencies in some headers

Used cppclean to help identify useless includes and removed them. This
involved erroneously included headers, but also cases where forward
declarations could have been used rather than a full include.

7 years agosyscall_emul: #ifdef new system calls to allow builds on OSX and BSD
Brandon Potter [Fri, 20 Jan 2017 19:12:58 +0000 (14:12 -0500)]
syscall_emul: #ifdef new system calls to allow builds on OSX and BSD

7 years agoruby: guard usage of GPUCoalescer code in Profiler
Tony Gutierrez [Thu, 19 Jan 2017 16:59:34 +0000 (11:59 -0500)]
ruby: guard usage of GPUCoalescer code in Profiler

the GPUCoalescer code is used in the ruby profiler regardless of
whether or not the coalescer code has been compiled, which can
lead to link/run time errors. here we add #ifdefs to guard the
usage of GPUCoalescer code. eventually we should refactor this
code to use probe points.

7 years agoruby: Check MessageBuffer space in garnet NetworkInterface
Matthew Poremba [Thu, 19 Jan 2017 16:59:10 +0000 (11:59 -0500)]
ruby: Check MessageBuffer space in garnet NetworkInterface

Garnet's NetworkInterface does not consider the size of MessageBuffers when
ejecting a Message from the network. Add a size check for the MessageBuffer
and only enqueue if space is available. If space is not available, the
message if placed in a queue and the credit is held. A callback from the
MessageBuffer is implemented to wake the NetworkInterface. If there are
messages in the stalled queue, they are processed first, in a FIFO manner
and if succesfully ejected, the credit is finally sent back upstream. The
maximum size of the stall queue is equal to the number of valid VNETs
with MessageBuffers attached.

7 years agoruby: Add occupancy stats to MessageBuffers
Matthew Poremba [Thu, 19 Jan 2017 16:58:59 +0000 (11:58 -0500)]
ruby: Add occupancy stats to MessageBuffers

This patch is an updated version of /r/3297.

"The most important statistic for measuring memory hierarchy performance is
throughput, which is affected by independent variables, buffer sizing and
communication latency. It is difficult/impossible to debug performance issues
through series buffers without knowing which are the bottlenecks. For finite
buffers, this patch adds statistics for the average number of messages in the
buffer, the occupancy of the buffer slots, and number of message stalls."

7 years agoruby: Check all VNETs for injection in garnet NetworkInterface
Matthew Poremba [Thu, 19 Jan 2017 16:58:49 +0000 (11:58 -0500)]
ruby: Check all VNETs for injection in garnet NetworkInterface

The NetworkInterface wakeup currently iterates over all VNETs and breaks the
loop if a VNET is unable to allocate a VC. This can cause a deadlock if a
lower numbered VNET is unable to allocate a VC while a higher numbered VNET
has idle VCs. This seems like a bug as Garnet 1.0 uses a while loop over an
if-statement, suggesting the break was intended for this while loop. This
patch removes the break statement, which allows up to one message to be
dequeued from a VNET and injected into the network.

7 years agosyscall_emul: [patch 2/22] move SyscallDesc into its own .hh and .cc
Brandon Potter [Wed, 9 Nov 2016 20:27:40 +0000 (14:27 -0600)]
syscall_emul: [patch 2/22] move SyscallDesc into its own .hh and .cc

The class was crammed into syscall_emul.hh which has tons of forward
declarations and template definitions. To clean it up a bit, moved the
class into separate files and commented the class with doxygen style
comments. Also, provided some encapsulation by adding some accessors and
a mutator.

The syscallreturn.hh file was renamed syscall_return.hh to make it consistent
with other similarly named files in the src/sim directory.

The DPRINTF_SYSCALL macro was moved into its own header file with the
include the Base and Verbose flags as well.

--HG--
rename : src/sim/syscallreturn.hh => src/sim/syscall_return.hh

7 years agostyle: [patch 1/22] use /r/3648/ to reorganize includes
Brandon Potter [Wed, 9 Nov 2016 20:27:37 +0000 (14:27 -0600)]
style: [patch 1/22] use /r/3648/ to reorganize includes

7 years agomisc: fixes deprecated sc_time function for SystemC 2.3.1
Matthias Jung [Mon, 9 Jan 2017 15:34:36 +0000 (09:34 -0600)]
misc: fixes deprecated sc_time function for SystemC 2.3.1

The non-standard sc_time constructors

- sc_time( uint64, bool scale )
- sc_time( double, bool scale )

have been deprecated in SystemC 2.3.1 and a warning is issued when being
used. Insted the new 'sc_time::from_value' function is used to omit the
warning message.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agomisc: Documentation Update
Matthias Jung [Mon, 9 Jan 2017 15:33:42 +0000 (09:33 -0600)]
misc: Documentation Update

Updates for READMEs of /util/cxx_config, /util/systemc, /util/tlm.
Some minor corrections, mostly with respect to MAC/OSX

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agoconfig: Fix missing include in fs.py
Matthias Jung [Mon, 9 Jan 2017 15:32:13 +0000 (09:32 -0600)]
config: Fix missing include in fs.py

Bugfix for Elastic Traces

This patch fixes the bug when elastic traces are used:

    build/ARM/gem5.opt \
    configs/example/fs.py \
    --cpu-type=arm_detailed \
    --num-cpu=1 \
    --mem-type=SimpleMemory \
    --mem-size=512MB \
    --mem-channels=1 \
    --caches \
    --elastic-trace-en \
    --data-trace-file=data.proto.gz \
    --inst-trace-file=inst.proto.gz \
    --machine-type=VExpress_EMM \
    --dtb-filename=vexpress.aarch32.ll_20131205.0-gem5.1cpu.dtb \
    --kernel=vmlinux.aarch32.ll_20131205.0-gem5 \
    --disk-image=linux-aarch32-ael.img

NameError: global name 'CpuConfig' is not defined

Signed-off by: Jason Lowe-Power <jason@lowepower.com>

7 years agosim: Remove declaration of unused CountedDrainEvent
Andreas Sandberg [Tue, 3 Jan 2017 17:31:39 +0000 (17:31 +0000)]
sim: Remove declaration of unused CountedDrainEvent

The CountedDrainEvent event was used to keep track of objects that
required additional simulation to drain. It was removed as a part of
the great drain rewrite, but the declaration remained.

Change-Id: I767a3213669040d3f27e2afafa2e4a5bb997e325
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
7 years agopython: Don't use Swig to cast stats
Andreas Sandberg [Tue, 3 Jan 2017 12:03:45 +0000 (12:03 +0000)]
python: Don't use Swig to cast stats

Call the stat visitor from the stat itself rather than casting stats
in Python. This reduces the number of ways visitors are called.

Change-Id: Ic4d0b7b32e3ab9897b9a34cd22d353f4da62d738
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Joe Gross <joseph.gross@amd.com>
7 years agosim: Remove redundant export_method_cxx_predecls
Andreas Sandberg [Tue, 3 Jan 2017 12:03:06 +0000 (12:03 +0000)]
sim: Remove redundant export_method_cxx_predecls

The headers declared in export_method_cxx_predecls are redundant since a
SimObject's main header is automatically included.

Change-Id: Ied9e84630b36960e54efe91d16f8c66fba7e0da0
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Joe Gross <joseph.gross@amd.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
7 years agoutil: Add maintainer tools to create upstream patches
Andreas Sandberg [Tue, 3 Jan 2017 11:31:46 +0000 (11:31 +0000)]
util: Add maintainer tools to create upstream patches

This changeset adds a maintainer script, create_patches.sh, that can
be used to prepare for upstream from a git repository. The script can
be used to generate patches in Mercurial or git format. The commit
messages in the exported patches are all filtered, see
upstream_msg_filter.sed, to ensure that irrelevant meta data isn't
included in the upstream commit.

Kudos to Curtis Dunham and Nikos Nikoleris for reviews and usability
enhancements for earlier versions of this patch.

Change-Id: Ia4cd089a32834b5e046ef58c0a173ca285b77bca
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
7 years agosim: Fix SE mode checkpoint restore file handling
Joel Hestness [Fri, 23 Dec 2016 14:43:18 +0000 (08:43 -0600)]
sim: Fix SE mode checkpoint restore file handling

When restoring from a checkpoint, the simulation used to use file handles from
the checkpoint. This disallows multiple separate restore simulations from using
separate input and output files and directories, and plays havoc when the
checkpointed file locations may have changed. Add handling to allow the command
line specified files to be used as input/output for the restored simulation
(Note: this is the similar functionality to FS mode for output and error).

7 years agocpu: implement an L-TAGE branch predictor
Arthur Perais [Wed, 21 Dec 2016 21:25:13 +0000 (15:25 -0600)]
cpu: implement an L-TAGE branch predictor

This patch implements an L-TAGE predictor, based on André Seznec's code
available from CBP-2
(http://hpca23.cse.tamu.edu/taco/camino/cbp2/cbp-src/realistic-seznec.h).

Signed-off-by Jason Lowe-Power <jason@lowepower.com>

7 years agocpu: disallow speculative update of branch predictor tables (o3)
Arthur Perais [Wed, 21 Dec 2016 21:07:16 +0000 (15:07 -0600)]
cpu: disallow speculative update of branch predictor tables (o3)

The Minor and o3 cpu models share the branch prediction
code. Minor relies on the BPredUnit::squash() function
to update the branch predictor tables on a branch mispre-
diction. This is fine because Minor executes in-order, so
the update is on the correct path. However, this causes the
branch predictor to be updated on out-of-order branch
mispredictions when using the o3 model, which should not
be the case.

This patch guards against speculative update of the branch
prediction tables. On a branch misprediction, BPredUnit::squash()
calls BpredUnit::update(..., squashed = true). The underlying
branch predictor tests against the value of squashed. If it is
true, it restores any speculatively updated internal state
it might have (e.g., global/local branch history), then returns.
If false, it updates its prediction tables. Previously, exist-
ing predictors did not test against the "squashed" parameter.

To accomodate for this change, the Minor model must now call
BPredUnit::squash() then BPredUnit::update(..., squashed = false)
on branch mispredictions. Before, calling BpredUnit::squash()
performed the prediction tables update.

The effect is a slight MPKI improvement when using the o3
model. A further patch should perform the same modifications
for the indirect target predictor and BTB (less critical).

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agocpu: correct comments in tournament branch predictor
Arthur Perais [Wed, 21 Dec 2016 21:06:13 +0000 (15:06 -0600)]
cpu: correct comments in tournament branch predictor

The tournament predictor is presented as doing speculative
update of the global history and non-speculative update
of the local history used to generate the branch prediction.
However, the code does speculative update of both histories.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agocpu: Resolve targets of predicted 'taken' decode for O3
Arthur Perais [Wed, 21 Dec 2016 21:05:24 +0000 (15:05 -0600)]
cpu: Resolve targets of predicted 'taken' decode for O3

The target of taken conditional direct branches does not
need to be resolved in IEW: the target can be computed at
decode, usually using the decoded instruction word and the PC.

The higher-than-necessary penalty is taken only on conditional
branches that are predicted taken but miss in the BTB. Thus,
this is mostly inconsequential on IPC if the BTB is big/associative
enough (fewer capacity/conflict misses). Nonetheless, what gem5
simulates is not representative of how conditional branch targets
can be handled.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agocpu: Clarify meaning of cachePorts variable in lsq_unit.hh of O3
Arthur Perais [Wed, 21 Dec 2016 21:04:06 +0000 (15:04 -0600)]
cpu: Clarify meaning of cachePorts variable in lsq_unit.hh of O3

cachePorts currently constrains the number of store packets written to the
D-Cache each cycle), but loads currently affect this variable. This leads
to unexpected congestion (e.g., setting cachePorts to a realistic 1 will
in fact allow a store to WB only if no loads have accessed the D-Cache
this cycle). In the absence of arbitration, this patch decouples how many
loads can be done per cycle from how many stores can be done per cycle.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
7 years agoruby: Make MessageBuffers actually finite sized
Joel Hestness [Tue, 20 Dec 2016 17:38:24 +0000 (11:38 -0600)]
ruby: Make MessageBuffers actually finite sized

When Ruby controllers stall messages in MessageBuffers, the buffer moves those
messages off the priority heap and into a per-address stall map. When buffers
are finite-sized, the test areNSlotsAvailable() only checks the size of the
priority heap, but ignores the stall map, so the map is allowed to grow
unbounded if the controller stalls numerous messages. This patch fixes the
problem by tracking the stall map size and testing the total number of messages
in the buffer appropriately.

7 years agoruby: fix typo in DMASequencer::ackCallback()
Tony Gutierrez [Tue, 20 Dec 2016 16:53:36 +0000 (11:53 -0500)]
ruby: fix typo in DMASequencer::ackCallback()

7 years agoruby: fix issue with unused var in DMASequencer
Tony Gutierrez [Tue, 20 Dec 2016 16:47:30 +0000 (11:47 -0500)]
ruby: fix issue with unused var in DMASequencer

the iterator declared in DMASequencer::ackCallback() is only used in an
assert, this causes clang to fail when building fast. here we move
the find call on the request table directly into the assert.

7 years agodist, dev: fix etherswitch upgrade script
Curtis Dunham [Mon, 19 Dec 2016 18:12:28 +0000 (12:12 -0600)]
dist, dev: fix etherswitch upgrade script

The aforementioned upgrader in [1] assumes every option in [system]
has a delimiting '.', and also seems to do its rewriting work a bit too
unconditionally.  Most checkpoints in the wild don't have this device,
in which case this script should be a safe no-op.

[1] 2aa4d7b  dist, dev: Fixed the packet ordering in etherswitch

Change-Id: Icfd0350985109df1628eb9ab864cda42c54060a8
Reviewed-by: Gabor Dozsa <gabor.dozsa@arm.com>
7 years agostats: update references
Curtis Dunham [Mon, 19 Dec 2016 17:03:28 +0000 (11:03 -0600)]
stats: update references

7 years agoarm: provide correct timer availability in ID_PFR1 register
Curtis Dunham [Mon, 19 Dec 2016 17:03:28 +0000 (11:03 -0600)]
arm: provide correct timer availability in ID_PFR1 register

Change-Id: Id4cd839c12b70616017a5830e3f9bbb59b0f97ba
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm: compute ID_AA64PFR{0,1}_EL1 registers
Curtis Dunham [Mon, 19 Dec 2016 17:03:28 +0000 (11:03 -0600)]
arm: compute ID_AA64PFR{0,1}_EL1 registers

Compute the proper values of the aforementioned registers from
the system configuration rather than configuring the values themselves.

Change-Id: If9774b6610a29568b80ae4866107b9a6a5b5be0f
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
7 years agoarm: compute ID_PFR{0,1} registers
Curtis Dunham [Mon, 19 Dec 2016 17:03:27 +0000 (11:03 -0600)]
arm: compute ID_PFR{0,1} registers

Compute the proper values of the aforementioned registers from
the system configuration rather than configuring the values themselves.

Change-Id: Ie7685b5d8b5f2dd9d6380b4af74f16d596b2bfd1
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>