Nilay Vaish [Tue, 25 Jun 2013 05:32:04 +0000 (00:32 -0500)]
ruby: moesi cmp directory: separate actions for external hits
This patch adds separate actions for requests that missed in the local cache
and messages were sent out to get the requested line. These separate actions
are required for differentiating between the hit and miss latencies in the
statistics collected.
Nilay Vaish [Tue, 25 Jun 2013 05:32:03 +0000 (00:32 -0500)]
ruby: mesi cmp directory: separate actions for external hits
This patch adds separate actions for requests that missed in the local cache
and messages were sent out to get the requested line. These separate actions
are required for differentiating between the hit and miss latencies in the
statistics collected.
Nilay Vaish [Tue, 25 Jun 2013 05:32:03 +0000 (00:32 -0500)]
ruby: profiler: lots of inter-related changes
The patch started of with removing the global variables from the profiler for
profiling the miss latency of requests made to the cache. The corrresponding
histograms have been moved to the Sequencer. These are combined together when
the histograms are printed. Separate histograms are now maintained for
tracking latency of all requests together, of hits only and of misses only.
A particular set of histograms used to use the type GenericMachineType defined
in one of the protocol files. This patch removes this type. Now, everything
that relied on this type would use MachineType instead. To do this, SLICC has
been changed so that multiple machine types can be declared by a controller
in its preamble.
Andreas Hansson [Mon, 24 Jun 2013 18:17:22 +0000 (14:17 -0400)]
stats: Bump x86 stats
This patch bumps the x86 stats to reflect the recent fixes.
Nilay Vaish [Mon, 24 Jun 2013 13:59:08 +0000 (08:59 -0500)]
ruby: remove the three files related to profiling
This patch removes the following three files: RubySlicc_Profiler.sm,
RubySlicc_Profiler_interface.cc and RubySlicc_Profiler_interface.hh.
Only one function prototyped in the file RubySlicc_Profiler.sm. Rest of the
code appearing in any of these files is not in use. Therefore, these files
are being removed.
That one single function, profileMsgDelay(), is being moved to the protocol
files where it is in use. If we need any of these deleted functions, I think
the right way to make them visible is to have the AbstractController class in
a .sm and let the controller state machine inherit from this class. The
AbstractController class can then have the prototypes of these profiling
functions in its definition.
ruby: MessageBuffer: Remove unused m_size variable
The m_size variable attempted to track m_prio_heap.size(), but it did so
incorrectly due to the functions reanalyzeMessages and reanalyzeAllMessages().
Since this variable is intended to track m_prio_heap.size(), we can simply
replace instances where m_size is referenced with m_prio_heap.size(), which
has the added bonus of removing the need for m_size.
Note: This patch also removes an extraneous DPRINTF format string designator
from reanalyzeAllMessages()
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Lena Olson [Thu, 20 Jun 2013 21:20:38 +0000 (16:20 -0500)]
ruby: fix typo in MOESI_CMP_token protocol
Lena Olson [Tue, 18 Jun 2013 21:59:22 +0000 (16:59 -0500)]
ruby: Fix prefetching for MESI_CMP_Directory
Transitions from present on PF_Ifetch were missing, causing a crash when
prefetching is enabled.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Lena Olson [Tue, 18 Jun 2013 21:58:52 +0000 (16:58 -0500)]
ruby: fix slicc compiler to complain about duplicate symbols
Previously, .sm files were allowed to use the same name for a type and a
variable. This is unnecessarily confusing and has some bad side effects, like
not being able to declare later variables in the same scope with the same type.
This causes the compiler to complain and die on things like Address Address.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Lena Olson [Tue, 18 Jun 2013 21:58:33 +0000 (16:58 -0500)]
ruby: restrict Address to being a type and not a variable name
Change all occurrances of Address as a variable name to instead use Addr.
Address is an allowed name in slicc even when Address is also being used as a
type, leading to declarations of "Address Address". While this works, it
prevents adding another field of type Address because the compiler then thinks
Address is a variable name, not type.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Andreas Sandberg [Tue, 18 Jun 2013 14:36:08 +0000 (16:36 +0200)]
x86: Add support for maintaining the x87 tag word
The current implementation of the x87 never updates the x87 tag
word. This is currently not a big issue since the simulated x87 never
checks for stack overflows, however this becomes an issue when
switching between a virtualized CPU and a simulated CPU. This
changeset adds support, which is enabled by default, for updating the
tag register to every floating point microop that updates the stack
top using the spm mechanism.
The new tag words is generated by the helper function
X86ISA::genX87Tags(). This function is currently limited to flagging a
stack position as valid or invalid and does not try to distinguish
between the valid, zero, and special states.
Andreas Sandberg [Tue, 18 Jun 2013 14:30:06 +0000 (16:30 +0200)]
x86: Fix loading of floating point constants
This changeset actually fixes two issues:
* The lfpimm instruction didn't work correctly when applied to a
floating point constant (it did work for integers containing the
bit string representation of a constant) since it used
reinterpret_cast to convert a double to a uint64_t. This caused a
compilation error, at least, in gcc 4.6.3.
* The instructions loading floating point constants in the x87
processor didn't work correctly since they just stored a truncated
integer instead of a double in the floating point register. This
changeset fixes the old microcode by using lfpimm instruction
instead of the limm instructions.
Andreas Sandberg [Tue, 18 Jun 2013 14:28:36 +0000 (16:28 +0200)]
x86: Initialize the MXCSR register
Andreas Sandberg [Tue, 18 Jun 2013 14:27:28 +0000 (16:27 +0200)]
x86: Make the boot state VMX compliant
This patch allows the default x86 state to be used when by CPUs that
use hardware virtualization.
Andreas Sandberg [Tue, 18 Jun 2013 14:10:42 +0000 (16:10 +0200)]
x86: Make fprem like the fprem on a real x87
The current implementation of fprem simply does an fmod and doesn't
simulate any of the iterative behavior in a real fprem. This isn't
normally a problem, however, it can lead to problems when switching
between CPU models. If switching from a real CPU in the middle of an
fprem loop to a simulated CPU, the output of the fprem loop becomes
correupted. This changeset changes the fprem implementation to work
like the one on real hardware.
Andreas Sandberg [Tue, 18 Jun 2013 14:10:22 +0000 (16:10 +0200)]
kvm: Use the address finalization code in the TLB
Reuse the address finalization code in the TLB instead of replicating
it when handling MMIO. This patch also adds support for injecting
memory mapped IPR requests into the memory system.
Andreas Sandberg [Tue, 18 Jun 2013 14:10:22 +0000 (16:10 +0200)]
x86: Add helper functions to access rflags
The rflags register is spread across several different registers. Most
of the flags are stored in MISCREG_RFLAGS, but some are stored in
microcode registers. When accessing RFLAGS, we need to reconstruct it
from these registers. This changeset adds two functions,
X86ISA::getRFlags() and X86ISA::setRFlags(), that take care of this
magic.
Andreas Sandberg [Tue, 18 Jun 2013 14:10:21 +0000 (16:10 +0200)]
x86: Fix the flag handling code in FABS and FCHS
This changeset fixes two problems in the FABS and FCHS
implementation. First, the ISA parser expects the assignment in
flag_code to be a pure assignment and not an and-assignment, which
leads to the isa_parser omitting the misc reg update. Second, the FCHS
and FABS macro-ops don't set the SetStatus flag, which means that the
default micro-op version, which doesn't update FSW, is executed.
Nilay Vaish [Sun, 16 Jun 2013 13:27:42 +0000 (08:27 -0500)]
Added tag stable_2013_06_16 for changeset
07352f119e48
Nilay Vaish [Thu, 13 Jun 2013 12:24:25 +0000 (07:24 -0500)]
config: Do not instantiate membus when using ruby
This patch moves the instantiation of system.membus in se.py to the area of
code where classic memory system has been dealt with. Ruby does not require
this bus and hence it should not be instantiated.
Andreas Sandberg [Tue, 11 Jun 2013 07:43:05 +0000 (09:43 +0200)]
kvm: Add more VM stats
This changeset adds the following stats to KVM:
* numVMHalfEntries: Number of entries into KVM to finalize pending
IO operations without executing guest instructions. These typically
happen as a result of a drain where the guest must finalize some
operations before the guest state is consistent.
* numExitSignal: Number of VM exits that have been triggered by a
signal. These usually happen as a result of the timer that limits
the time spent in KVM.
Andreas Sandberg [Tue, 11 Jun 2013 07:24:55 +0000 (09:24 +0200)]
kvm: Separate host frequency from simulated CPU frequency
We used to use the KVM CPU's clock to specify the host frequency. This
was not ideal for several reasons. One of them being that the clock
parameter of a CPU determines the frequency of some of the components
connected to the CPU. This changeset adds a separate hostFreq
parameter that should be used to specify the host frequency until we
add code to autodetect it. The hostFactor should still be used to
specify the conversion factor between the host performance and that of
the simulated system.
Andreas Sandberg [Tue, 11 Jun 2013 07:24:51 +0000 (09:24 +0200)]
kvm: Don't handle IO and execute in the same tick
We currently execute instructions in the guest and then handle any IO
request right after we break out of the virtualized environment. This
has the effect of executing IO requests in the exact same tick as the
first instruction in the sequence that was just run. There seem to be
cases where this simplification upsets some timing-sensitive devices.
This changeset splits execute and IO (and other services) across
multiple ticks. This is implemented by adding a separate
RunningService state to the CPU state machine. When a VM requires
service, it enters into this state and pending IO is then serviced in
the future instead of immediately. The delay between getting the
request and servicing it depends on the number of cycles executed in
the guest, which allows other components to catch up with the CPU.
Andreas Sandberg [Tue, 11 Jun 2013 07:24:40 +0000 (09:24 +0200)]
kvm: Maintain a local instruction counter and update totalNumInsts
Update the system's totalNumInst counter when exiting from KVM and
maintain an internal absolute instruction count instead of relying on
the one from perf.
Andreas Sandberg [Tue, 11 Jun 2013 07:24:38 +0000 (09:24 +0200)]
x86: Fix bug when copying TSC on CPU handover
The TSC value stored in MISCREG_TSC is actually just an offset from
the current CPU cycle to the actual TSC value. Writes with
side-effects to the TSC subtract the current cycle count before
storing the new value, while reads add the current cycle count. When
switching CPUs, the current value is copied without side-effects. This
works as long as the source and the destination CPUs have the same
clock frequencies. The TSC will jump, sometimes backwards, if they
have different clock frequencies. Most OSes assume the TSC to be
monotonic and break when this happens.
This changeset makes sure that the TSC is copied with side-effects to
ensure that the offset is updated to match the new CPU.
Andreas Sandberg [Tue, 11 Jun 2013 07:24:10 +0000 (09:24 +0200)]
sim: Revert [
34e3295b0e39] (sim: Fix early termination in mult...)
HG changset
34e3295b0e39 introduced a check in the main simulation
loop that discards exit events that happen at the same tick as another
exit event. This was supposed to fix a problem where a simulation
script got confused by multiple exit events. This obviously breaks the
simulator since it can hide important simulation events, such as a
simulation failure, that happen at the same time as a non-fatal
simulation event.
Andreas Sandberg [Tue, 11 Jun 2013 07:18:25 +0000 (09:18 +0200)]
cpu: Add support for scheduling multiple inst/load stop events
Currently, the only way to get a CPU to stop after a fixed number of
instructions/loads is to set a property on the CPU that causes a
SimLoopExitEvent to be scheduled when the CPU is constructed. This is
clearly not ideal in cases where the simulation script wants the CPU
to stop at multiple instruction counts (e.g., SimPoint generation).
This changeset adds the methods scheduleInstStop() and
scheduleLoadStop() to the BaseCPU. These methods are exported to
Python and are designed to be used from the simulation script. By
using these methods instead of the old properties, a simulation script
can schedule a stop at any point during simulation or schedule
multiple stops. The number of instructions specified when scheduling a
stop is relative to the current point of execution.
Nilay Vaish [Mon, 10 Jun 2013 11:46:20 +0000 (06:46 -0500)]
stats: updates due to changes to ruby
Ruby's controller statistics have been mostly moved to stats.txt now.
Plus stats.txt for solaris/t1000-simple-atomic and arm/20.parser are
also being updated.
Nilay Vaish [Sun, 9 Jun 2013 12:30:00 +0000 (07:30 -0500)]
ruby: remove several unused variables in Profiler
This patch removes per processor cycle count, histogram for filter stats,
histogram for multicasts, histogram for prefetch wait, some function
prototypes that do not have definitions.
Nilay Vaish [Sun, 9 Jun 2013 12:29:59 +0000 (07:29 -0500)]
ruby: remove periodic event from Profiler
The Profiler class does not need an event for dumping statistics
periodically. This is because there is a method for dumping statistics
for all the sim objects periodically. Since Ruby is a sim object, its
statistics are also included.
Nilay Vaish [Sun, 9 Jun 2013 12:29:59 +0000 (07:29 -0500)]
ruby: stats: use gem5's stats for cache and memory controllers
This moves event and transition count statistics for cache controllers to
gem5's statistics. It does the same for the statistics associated with the
memory controller in ruby.
All the cache/directory/dma controllers individually collect the event and
transition counts. A callback function, collateStats(), has been added that
is invoked on the controller version 0 of each controller class. This
function adds all the individual controller statistics to a vector
variables. All the code for registering the statistical variables and
collating them is generated by SLICC. The patch removes the files
*_Profiler.{cc,hh} and *_ProfileDumper.{cc,hh} which were earlier used for
collecting and dumping statistics respectively.
Nilay Vaish [Sun, 9 Jun 2013 12:29:58 +0000 (07:29 -0500)]
ruby: remove undefined functions in Address class
Nilay Vaish [Sun, 9 Jun 2013 12:29:57 +0000 (07:29 -0500)]
stats: allow printing vectors on a single line
This patch adds a new flag to specify if the data values for a given vector
should be printed in one line in the stats.txt file. The default behavior
will be to print the data in multiple lines. It makes changes to print
functions to enforce this behavior.
Nilay Vaish [Sun, 9 Jun 2013 02:57:02 +0000 (21:57 -0500)]
config: add atomic cpu to X86_MESI_CMP_directory build options
There is some problem with the way listing cpu options right now.
Since Ruby uses the options variable, this variable has to be created in the
config file that runs the fs test for x86 and mesi cmp directory combination.
While creating the variable, some error is occurs due to the way list of cpu
types is now created. Hence, we need to compile all the cpu models.
Steve Reinhardt [Sat, 8 Jun 2013 14:28:33 +0000 (10:28 -0400)]
Updating EIO regression reference outputs for new stats.
Ali Saidi [Tue, 4 Jun 2013 20:17:04 +0000 (15:17 -0500)]
scons: ammend swig warning error to version 2.0.10 as well
Andreas Sandberg [Tue, 4 Jun 2013 08:08:21 +0000 (10:08 +0200)]
dev: Clarify why updates are delayed when the MC14818 is activated
Andreas Sandberg [Mon, 3 Jun 2013 11:55:41 +0000 (13:55 +0200)]
arch: Create a method to finalize physical addresses
in the TLB
Some architectures (currently only x86) require some fixing-up of
physical addresses after a normal address translation. This is usually
to remap devices such as the APIC, but could be used for other memory
mapped devices as well. When running the CPU in a using hardware
virtualization, we still need to do these address fix-ups before
inserting the request into the memory system. This patch moves this
patch allows that code to be used by such CPUs without doing full
address translations.
Andreas Sandberg [Mon, 3 Jun 2013 11:51:03 +0000 (13:51 +0200)]
base: Make the Python module loader PEP302 compliant
The custom Python loader didn't comply with PEP302 for two reasons:
* Previously, we would overwrite old modules on name
conflicts. PEP302 explicitly states that: "If there is an existing
module object named 'fullname' in sys.modules, the loader must use
that existing module".
* The "__package__" attribute wasn't set. PEP302: "The __package__
attribute must be set."
This changeset addresses both of these issues.
Andreas Sandberg [Mon, 3 Jun 2013 11:40:05 +0000 (13:40 +0200)]
config: Add missing CPUs to --restore-with-cpu
The --restore-with-cpu option didn't use CpuConfig.cpu_names() to
determine which CPU names are valid, instead it used a static list of
known CPU names. This changeset makes the option parsing code use the
CPU list from the CpuConfig module instead.
Andreas Sandberg [Mon, 3 Jun 2013 11:39:11 +0000 (13:39 +0200)]
kvm: Allow architectures to override the cycle accounting mechanism
Some architectures have special registers in the guest that can be
used to do cycle accounting. This is generally preferrable since the
prevents the guest from seeing a non-monotonic clock. This changeset
adds a virtual method, getHostCycles(), that the architecture-specific
code can override to implement this functionallity. The default
implementation uses the hwCycles counter.
Andreas Sandberg [Mon, 3 Jun 2013 11:38:59 +0000 (13:38 +0200)]
kvm: Add handling of EAGAIN when creating timers
timer_create can apparently return -1 and set errno to EAGAIN if the
kernel suffered a temporary failure when allocating a timer. This
happens from time to time, so we need to handle it.
Andreas Sandberg [Mon, 3 Jun 2013 11:21:21 +0000 (13:21 +0200)]
sim: Add debug output when executing pseudo-instructions
Andreas Sandberg [Mon, 3 Jun 2013 10:36:56 +0000 (12:36 +0200)]
kvm: Add a call to thread->startup() in startup()
It is now required to initialize the thread context by calling
startup() on it. Failing to do so currently causes decoder in
x86-based CPUs to get very confused when restoring from checkpoints.
Andreas Sandberg [Mon, 3 Jun 2013 10:28:52 +0000 (12:28 +0200)]
dev: Add support for disabling ticking and the divider in MC146818
Some Linux versions disable updates (regB.set = 1) to prevent the chip
from updating its internal state while the OS is updating it. Support
for this was already there, this patch merely disables the check in
writeReg that prevented it from being enabled. The patch also includes
support for disabling the divider, which is used to control when clock
updates should start after setting the internal RTC state.
These changes are required to boot most vanilla Linux distributions
that update the RTC settings at boot.
Andreas Sandberg [Mon, 3 Jun 2013 10:28:41 +0000 (12:28 +0200)]
dev: Clean up MC146818 register (A & B) handling
Rewrite reg A & B handling to use the bitunion stuff instead of bit
masking. Add better error messages when the kernel tries to enable
unsupported stuff.
Andreas Hansson [Thu, 30 May 2013 16:54:18 +0000 (12:54 -0400)]
stats: Update the stats to reflect bus and memory changes
This patch updates the stats to reflect the addition of the bus stats,
and changes to the bus layers. In addition it updates the stats to
match the addition of the static pipeline latency of the memory
conotroller and the addition of a stat tracking the bytes per
activate.
Andreas Hansson [Thu, 30 May 2013 16:54:14 +0000 (12:54 -0400)]
mem: More descriptive DRAM config names
This patch changes the class names of the variuos DRAM configurations
to better reflect what memory they are based on. The speed and
interface width is now part of the name, and also the alias that is
used to select them on the command line.
Some minor changes are done to the actual parameters, to better
reflect the named configurations. As a result of these changes the
regressions change slightly and the stats will be bumped in a separate
patch.
Andreas Hansson [Thu, 30 May 2013 16:54:13 +0000 (12:54 -0400)]
mem: Add bytes per activate DRAM controller stat
This patch adds a histogram to track how many bytes are accessed in an
open row before it is closed. This metric is useful in characterising
a workload and the efficiency of the DRAM scheduler. For example, a
DDR3-1600 device requires 44 cycles (tRC) before it can activate
another row in the same bank. For a x32 interface (8 bytes per cycle)
that means 8 x 44 = 352 bytes must be transferred to hide the
preparation time.
Andreas Hansson [Thu, 30 May 2013 16:54:12 +0000 (12:54 -0400)]
mem: Add static latency to the DRAM controller
This patch adds a frontend and backend static latency to the DRAM
controller by delaying the responses. Two parameters expressing the
frontend and backend contributions in absolute time are added to the
controller, and the appropriate latency is added to the responses when
adding them to the (infinite) queued port for sending.
For writes and reads that hit in the write buffer, only the frontend
latency is added. For reads that are serviced by the DRAM, the static
latency is the sum of the pipeline latencies of the entire frontend,
backend and PHY. The default values are chosen based on having roughly
10 pipeline stages in total at 500 MHz.
In the future, it would be sensible to make the controller use its
clock and convert these latencies (and a few of the DRAM timings) to
cycles.
Andreas Hansson [Thu, 30 May 2013 16:54:11 +0000 (12:54 -0400)]
mem: Spring cleaning of MSHR and MSHRQueue
This patch does some minor tidying up of the MSHR and MSHRQueue. The
clean up started as part of some ad-hoc tracing and debugging, but
seems worthwhile enough to go in as a separate patch.
The highlights of the changes are reduced scoping (private) members
where possible, avoiding redundant new/delete, and constructor
initialisation to please static code analyzers.
Andreas Hansson [Thu, 30 May 2013 16:54:09 +0000 (12:54 -0400)]
mem: Fix MSHR print format
This patch fixes an incorrect print format string by adding an
additional string element.
Andreas Hansson [Thu, 30 May 2013 16:54:09 +0000 (12:54 -0400)]
cpu: Prune the stale TraceCPU
This patch prunes the TraceCPU as the code is stale and the
functionality that it provided can now be achieved with the TrafficGen
using its trace playback mode.
The TraceCPU was able to play back pre-recorded memory traces of a few
different formats, and to achieve this level of flexibility with the
TrafficGen, use the util/encode_packet_trace (with suitable
modifications) to create a protobuf trace off-line.
Sascha Bischoff [Thu, 30 May 2013 16:54:08 +0000 (12:54 -0400)]
cpu: Check that minimum TrafficGen period is less than max period
Add a check which ensures that the minumum period for the LINEAR and
RANDOM traffic generator states is less than or equal to the maximum
period. If the minimum period is greater than the maximum period a
fatal is triggered.
Sascha Bischoff [Thu, 30 May 2013 16:54:07 +0000 (12:54 -0400)]
cpu: Fix bug when reading in TrafficGen state transitions
This patch fixes a bug with the traffic generator which occured when
reading in the state transitions from the configuration
file. Previously, the size of the vector which stored the transitions
was used to get the size of the transitions matrix, rather than using
the number of states. Therefore, if there were more transitions than
states, i.e. some transitions has a probability of less than 1, then
the traffic generator would fatal when trying to check the
transitions.
This issue has been addressed by using the number of input states,
rather then the number of transitions.
Andreas Hansson [Thu, 30 May 2013 16:54:06 +0000 (12:54 -0400)]
cpu: Add request elasticity to the traffic generator
This patch adds an optional request elasticity to the traffic
generator, effectievly compensating for it in the case of the linear
and random generators, and adding it in the case of the trace
generator. The accounting is left with the top-level traffic
generator, and the individual generators do the necessary math as part
of determining the next packet tick.
Note that in the linear and random generators we have to compensate
for the blocked time to not be elastic, i.e. without this patch the
aforementioned generators will slow down in the case of back-pressure.
Andreas Hansson [Thu, 30 May 2013 16:54:05 +0000 (12:54 -0400)]
cpu: Block traffic generator when requests have to retry
This patch changes the queued port for a conventional master port and
stalls the traffic generator when requests are not immediately
accepted. This is a first step to allowing elasticity in the injection
of requests.
The patch also adds stats for the sent packets and retries, and
slightly changes how the nextPacketTick and getNextPacket
interact. The advancing of the trace is now moved to getNextPacket and
nextPacketTick is only responsible for answering the question when the
next packet should be sent.
Andreas Hansson [Thu, 30 May 2013 16:54:04 +0000 (12:54 -0400)]
cpu: Move traffic generator sending out of generator states
This patch moves the responsibility for sending packets out of the
generator states and leaves it with the top-level traffic
generator. The main aim of this patch is to enable a transition to
non-queued ports, i.e. with send/retry flow control, and to do so it
is much more convenient to not wrap the port interactions and instead
leave it all local to the traffic generator.
The generator states now only govern when they are ready to send
something new, and the generation of the packets to send. They thus
have no knowledge of the port that is used.
Andreas Hansson [Thu, 30 May 2013 16:54:03 +0000 (12:54 -0400)]
cpu: Fold together the StateGraph and the TrafficGen
This patch simplifies the object hierarchy of the traffic generator by
getting rid of the StateGraph class and folding this functionality
into the traffic generator itself.
The main goal of this patch is to facilitate upcoming changes by
reducing the number of affected layers.
Andreas Hansson [Thu, 30 May 2013 16:54:02 +0000 (12:54 -0400)]
mem: Make returning snoop responses occupy response layer
This patch introduces a mirrored internal snoop port to facilitate
easy addition of flow control for the snoop responses that are turned
into normal responses on their return. To perform this, the slave
ports of the coherent bus are wrapped in internal master ports that
are passed as the source ports to the response layer in question.
As a result of this patch, there is more contention for the response
resources, and as such system performance will decrease slightly.
A consequence of the mirrored internal port is that the port the bus
tells to retry (the internal one) and the port actually retrying (the
mirrored) one are not the same. Thus, the existing check in tryTiming
is not longer correct. In fact, the test is redundant as the layer is
only in the retry state while calling sendRetry on the waiting port,
and if the latter does not immediately call the bus then the retry
state is left. Consequently the check is removed.
Andreas Hansson [Thu, 30 May 2013 16:54:01 +0000 (12:54 -0400)]
mem: Make the buses multi layered
This patch makes the buses multi layered, and effectively creates a
crossbar structure with distributed contention ports at the
destination ports. Before this patch, a bus could have a single
request, response and snoop response in flight at any time, and with
these changes there can be as many requests as connected slaves (bus
master ports), and as many responses as connected masters (bus slave
ports).
Together with address interleaving, this patch enables us to create
high-throughput memory interconnects, e.g. 50+ GByte/s.
Andreas Hansson [Thu, 30 May 2013 16:54:00 +0000 (12:54 -0400)]
mem: Separate the two snoop response cases in the bus
This patch makes the flow control and state updates of the coherent
bus more clear by separating the two cases, i.e. forward as a snoop
response, or turn it into a normal response.
With this change it is also more clear what resources are being
occupied, and that we effectively bypass the busy check for the second
case. As a result of the change in resource usage some stats change.
Andreas Hansson [Thu, 30 May 2013 16:53:59 +0000 (12:53 -0400)]
mem: Tidy up a few variables in the bus
This patch does some minor housekeeping on the bus code, removing
redundant code, and moving the extraction of the destination id to the
top of the functions using it.
Uri Wiener [Thu, 30 May 2013 16:53:58 +0000 (12:53 -0400)]
mem: Add basic stats to the buses
This patch adds a basic set of stats which are hard to impossible to
implement using only communication monitors, and are needed for
insight such as bus utilization, transactions through the bus etc.
Stats added include throughput and transaction distribution, and also
a two-dimensional vector capturing how many packets and how much data
is exchanged between the masters and slaves connected to the bus.
Andreas Hansson [Thu, 30 May 2013 16:53:57 +0000 (12:53 -0400)]
mem: Use unordered set in bus request tracking
This patch changes the set used to track outstanding requests to an
unordered set (part of C++11 STL). There is no need to maintain the
order, and hopefully there might even be a small performance benefit.
Andreas Hansson [Thu, 30 May 2013 16:53:57 +0000 (12:53 -0400)]
mem: Check for waiting state in bus draining
This patch fixes a bug in the bus where the bus transitions from busy
to idle and still has a port that is waiting for a retry from a peer.
Andreas Hansson [Thu, 30 May 2013 16:53:56 +0000 (12:53 -0400)]
mem: Add a LPDDR3-1600 configuration
This patch adds a typical (leaning towards fast) LPDDR3 configuration
based on publically available data. As expected, it looks very similar
to the LPDDR2-S4 configuration, only with a slightly lower burst time.
Andreas Hansson [Thu, 30 May 2013 16:53:55 +0000 (12:53 -0400)]
mem: Adapt the LPDDR2 to match a single x32 channel
This patch adapts the existing LPDDR2 configuration to make use of the
multi-channel functionality. Thus, to get a x64 interface two
controllers should be instantiated using the makeMultiChannel method.
The page size and ranks are also adapted to better suit with a typical
LPDDR2 part.
Andreas Hansson [Thu, 30 May 2013 16:53:54 +0000 (12:53 -0400)]
mem: Avoid explicitly zeroing the memory backing store
This patch removes the explicit memset as it is redundant and causes
the simulator to touch the entire space, forcing the host system to
allocate the pages.
Anonymous pages are mapped on the first access, and the page-fault
handler is responsible for zeroing them. Thus, the pages are still
zeroed, but we avoid touching the entire allocated space which enables
us to use much larger memory sizes as long as not all the memory is
actually used.
Andreas Hansson [Thu, 30 May 2013 16:53:53 +0000 (12:53 -0400)]
util: Auto generate the packet proto definitions
This patch simplifies the usage of the packet trace encoder/decoder by
attempting to automatically generating the packet proto definitions in
case they cannot be found.
Andreas Hansson [Thu, 30 May 2013 16:53:53 +0000 (12:53 -0400)]
base: Avoid size limitation on protobuf coded streams
This patch changes how the streams are created to avoid the size
limitation on the coded streams. As we only read/write a single
message at a time, there is never any message larger than a few
bytes. However, the coded stream eventually complains that its
internal counter reaches 64+ MByte if the total file size exceeds this
value.
Based on suggestions in the protobuf discussion forums, the coded
stream is now created for every message that is read/written. The
result is that the internal byte count never goes about tens of bytes,
and we can read/write any size file that the underlying file I/O can
handle.
Andreas Hansson [Thu, 30 May 2013 16:53:52 +0000 (12:53 -0400)]
cpu: Make hash struct instead of class to please clang
This patch changes the type of the hash function for BasicBlockRanges
to match the original definition of the templatized type. Without
this, clang raises a warning and combined with the "-Werror" flag this
causes compilation to fail.
Malek Musleh [Tue, 21 May 2013 16:57:14 +0000 (11:57 -0500)]
ruby: slicc: fix error msg in TypeFieldMemberAST.py
Nilay Vaish [Tue, 21 May 2013 16:41:27 +0000 (11:41 -0500)]
x86, regressions: updates stats
This is due to op class, function call, walker patches.
Gedare Bloom [Tue, 21 May 2013 16:40:11 +0000 (11:40 -0500)]
x86: Squash outstanding walks when instructions are squashed.
This is the x86 version of the ARM changeset
baa17ba80e06. In case an
instruction has been squashed by the o3 cpu, this patch allows page
table walker to avoid carrying out a pending translation that the
instruction requested for.
Nilay Vaish [Tue, 21 May 2013 16:34:41 +0000 (11:34 -0500)]
x86: mark instructions for being function call/return
Currently call and return instructions are marked as IsCall and IsReturn. Thus, the
branch predictor does not use RAS for these instructions. Similarly, the number of
function calls that took place is recorded as 0. This patch marks these instructions
as they should be.
Nilay Vaish [Tue, 21 May 2013 16:33:57 +0000 (11:33 -0500)]
x86: add op class for int and fp microops in isa description
Currently all the integer microops are marked as IntAluOp and the floating
point microops are marked as FloatAddOp. This patch adds support for marking
different microops differently. Now IntMultOp, IntDivOp, FloatDivOp,
FloatMultOp, FloatCvtOp, FloatSqrtOp classes will be used as well. This will
help in providing different latencies for different op class.
Nilay Vaish [Tue, 21 May 2013 16:32:57 +0000 (11:32 -0500)]
stats: updates statistics for ruby regressions
Nilay Vaish [Tue, 21 May 2013 16:32:45 +0000 (11:32 -0500)]
ruby: moesi hammer: cosmetic changes
Updates copyright years, removes space at the end of lines, shortens
variable names.
Nilay Vaish [Tue, 21 May 2013 16:32:38 +0000 (11:32 -0500)]
ruby: mesi cmp directory: cosmetic changes
Updates copyright years, removes space at the end of lines, shortens
variable names.
Nilay Vaish [Tue, 21 May 2013 16:32:24 +0000 (11:32 -0500)]
ruby: moesi cmp token: cosmetic changes
Updates copyright years, removes space at the end of lines, shortens
variable names.
Nilay Vaish [Tue, 21 May 2013 16:32:15 +0000 (11:32 -0500)]
ruby: moesi cmp directory: cosmetic changes
Updates copyright years, removes space at the end of lines, shortens
variable names.
Nilay Vaish [Tue, 21 May 2013 16:32:08 +0000 (11:32 -0500)]
configs: ruby: pass the option use_map to directory controller
The option was not being passed to directory controllers for the protocols
MOESI_CMP_token and MOESI_CMP_directory. This was resulting in an error
while instantiating the directory controller as it tries to access the
wrong type of memory.
ruby: add stats to .sm files, remove cache profiler
This patch changes the way cache statistics are collected in ruby.
As of now, there is separate entity called CacheProfiler which holds
statistical variables for caches. The CacheMemory class defines different
functions for accessing the CacheProfiler. These functions are then invoked
in the .sm files. I find this approach opaque and prone to error. Secondly,
we probably should not be paying the cost of a function call for recording
statistics.
Instead, this patch allows for accessing statistical variables in the
.sm files. The collection would become transparent. Secondly, it would happen
in place, so no function calls. The patch also removes the CacheProfiler class.
--HG--
rename : src/mem/slicc/ast/InfixOperatorExprAST.py => src/mem/slicc/ast/OperatorExprAST.py
Anthony Gutierrez [Tue, 14 May 2013 22:39:47 +0000 (18:39 -0400)]
cpu: remove local/globalHistoryBits params from branch pred
having separate params for the local/globalHistoryBits and the
local/globalPredictorSize can lead to inconsistencies if they
are not carefully set. this patch dervies the number of bits
necessary to index into the local/global predictors based on
their size.
the value of the localHistoryTableSize for the ARM O3 CPU has been
increased to 1024 from 64, which is more accurate for an A15 based
on some correlation against A15 hardware.
Andreas Sandberg [Tue, 14 May 2013 14:02:45 +0000 (16:02 +0200)]
kvm: Add support for disabling coalesced MMIO
Add the option useCoalescedMMIO to the BaseKvmCPU. The default
behavior is to disable coalesced MMIO since this hasn't been heavily
tested.
Andreas Sandberg [Tue, 14 May 2013 13:59:43 +0000 (15:59 +0200)]
kvm: Dump state before panic in KVM exit handlers
Andreas Sandberg [Tue, 14 May 2013 13:56:04 +0000 (15:56 +0200)]
kvm: Fix the memory interface used by KVM
The CpuPort class was removed before the KVM patches were committed,
which means that the KVM interface currently doesn't compile. This
changeset adds the BaseKvmCPU::KVMCpuPort class which derives from
MasterPort. This class is used on the data and instruction ports
instead of the old CpuPort.
Andreas Sandberg [Tue, 14 May 2013 13:06:50 +0000 (15:06 +0200)]
arm: Add support for the m5fail pseudo-op
Andreas Sandberg [Tue, 14 May 2013 13:03:45 +0000 (15:03 +0200)]
arm: Fix compilation error in m5 utility
Changeset
5ca6098b9560 accidentally broke the m5 utility. This
changeset adds the missing co-processor call used to trigger the
pseudo-op in ARM mode and fixes an alignment issue that caused some
pseudo-ops to leave thumb mode.
Andreas Sandberg [Tue, 7 May 2013 12:47:04 +0000 (14:47 +0200)]
arm: Make libm5 a dependency of the m5 utility
The m5 utility wasn't relinked properly since libm5.a wasn't a
dependency of the utility. This changeset addresses that issue.
Andreas Sandberg [Thu, 2 May 2013 10:03:43 +0000 (12:03 +0200)]
kvm: Add a stat counting number of instructions executed
This changeset adds a 'numInsts' stat to the KVM-based CPU. It also
cleans up the variable names in kvmRun to make the distinction between
host cycles and estimated simulated cycles clearer. As a bonus
feature, it also fixes a warning (unreferenced variable) when
compiling in fast mode.
Andreas Sandberg [Thu, 2 May 2013 10:02:19 +0000 (12:02 +0200)]
kvm: Add checkpoint debug print
Add a debug print (when the Checkpoint debug flag is set) on serialize
and unserialize. Additionally, dump the KVM state before
serializing. The KVM state isn't dumped after unserializing since the
state is loaded lazily on the next KVM entry.
Andreas Sandberg [Thu, 2 May 2013 10:01:50 +0000 (12:01 +0200)]
kvm: Make MMIO requests uncacheable
Device accesses are normally uncacheable. This change probably doesn't
make any difference since we normally disable caching when KVM is
active. However, there might be devices that check this, so we'd
better enable this flag to be safe.
Andreas Sandberg [Thu, 2 May 2013 09:54:08 +0000 (11:54 +0200)]
sim: Add support for m5fail in pseudoInst()
Andreas Hansson [Sun, 28 Apr 2013 21:14:39 +0000 (17:14 -0400)]
config: Added memory type to t1000 regression
This patch adds the memory type parameter to the t1000 regression.
Michael Levenhagen [Tue, 23 Apr 2013 20:21:32 +0000 (15:21 -0500)]
x86: corrects vsyscall address for gettimeofday
The vsyscall address for gettimeofday is 0xffffffffff600000ul. The offset
therefore should be 0x0 instead of 0x410. This can be cross checked with
the file sysdeps/unix/sysv/linux/x86_64/gettimeofday.c in source of glibc.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Michael Levenhagen [Tue, 23 Apr 2013 20:21:30 +0000 (15:21 -0500)]
x86: enable gettimeofday and getppid system calls
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Marco Elver [Tue, 23 Apr 2013 16:56:48 +0000 (11:56 -0500)]
config: Fix mem-type option not used in ruby_fs script
This fixes missing mem-type arguments to makeLinuxAlphaRubySystem and
makeLinuxX86System after a recent changeset allowing mem-type to be
configured via options missed fixing these calls.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Mitch Hayenga [Tue, 23 Apr 2013 13:47:52 +0000 (09:47 -0400)]
sim: Fix two bugs relating to software caching of PageTable entries.
The existing implementation can read uninitialized data or stale information
from the cached PageTable entries.
1) Add a valid bit for the cache entries. Simply using zero for the virtual
address to signify invalid entries is not sufficient. Speculative, wrong-path
accesses frequently access page zero. The current implementation would return
a uninitialized TLB entry when address zero was accessed and the PageTable
cache entry was invalid.
2) When unmapping/mapping/remaping a page, invalidate the corresponding
PageTable cache entry if one already exists.