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2012-09-10Ruby System: Convert to Clocked ObjectNilay Vaish
This patch moves Ruby System from being a SimObject to recently introduced ClockedObject.
2012-09-10Ruby Slicc: remove the call to cin.get() functionNilay Vaish
If I understand correctly, this was put in place so that a debugger can be attached when the protocol aborts. While this sounds useful, it is a problem when the simulation is not being actively monitored. I think it is better to remove this.
2012-09-10Mem: Allow serializing of more than INT_MAX bytesMarco Elver
Despite gzwrite taking an unsigned for length, it returns an int for bytes written; gzwrite fails if (int)len < 0. Because of this, call gzwrite with len no larger than INT_MAX: write in blocks of INT_MAX if data to be written is larger than INT_MAX.
2012-09-10NetBSD: Build on NetBSDPalle Lyckegaard
Minor patch against so building on NetBSD is possible.
2012-09-10AddrRange: Remove the unused range_ops headerAndreas Hansson
This patch prunes the range_ops header that is no longer used. The bridge used it to do filtering of address ranges, but this is changed since quite some time. Ultimately this patch aims to simplify the handling of ranges before specialising the AddrRange to an AddrRegion that also allows striping bits to be selected.
2012-09-10Inet: Remove the SackRange and its useAndreas Hansson
This patch aims to simplify the use of the Range class before introducing a more elaborate AddrRegion to replace the AddrRange. The SackRange is the only use of the range class besides address ranges, and the removal of this use makes for an easier modification of the range class. The functionlity that is removed with this patch is not used anywhere throughout the code base.
2012-09-10Device: Bump PIO and PCI latencies to more reasonable valuesAndreas Hansson
This patch addresses a previously highlighted issue with the default latencies used for PIO and PCI devices. The values are merely educated guesses and might not represent the particular system you want to model. However, the values in this patch are definitely far more realistic than the previous ones. In i8254xGBe, the writeConfig method is updated to use configDelay instead of pioDelay. A follow-up patch will update the regression stats.
2012-09-07sim: Update the SimObject documentationAndreas Sandberg
Includes a small change in sim_object.cc that adds the name space to the output stream parameter in serializeAll. Leaving out the name space unfortunately confuses Doxygen.
2012-09-07sim: Remove the unused SimObject::regFormulas methodAndreas Sandberg
Simulation objects normally register derived statistics, presumably what regFormulas originally was meant for, in regStats(). This patch removes regRegformulas since there is no need to have a separate method call to register formulas.
2012-09-07O3: Get rid of incorrect assert in RAS.Ali Saidi
2012-09-07dev: Fix bifield definition in timer_cpulocal.hhAli Saidi
Bitfield definition in the local timer model for ARM had the bitfield range numbers reversed which could lead to buggy behavior.
2012-09-07Igbe: Newer kernels seem to allow TSO headers and packet data to be in one descAli Saidi
Implement some code we used to panic on as it actually does happen with the e1000 driver in Linux 3.3+. We used to assume that a TSO header would never be part of a larger payload, however it appears as though it now can be.
2012-09-07sim: add validation to make sure there is memory where we're loading the kernelKrishnendra Nathella
2012-09-07loader: initialize all memory in the ObjectFile objects.Ali Saidi
Some bare metal build flows seem to build binaries that we aren't necessarily expecting. Initialize everything to 0, so we don't make any assumptions about what is or isn't in the binary.
2012-09-07ARM: Fix one of the timers used in the VExpress EMM platform.Ali Saidi
2012-09-07Param: Transition to Cycles for relevant parametersAndreas Hansson
This patch is a first step to using Cycles as a parameter type. The main affected modules are the CPUs and the Ruby caches. There are definitely plenty more places that are affected, but this patch serves as a starting point to making the transition. An important part of this patch is to actually enable parameters to be specified as Param.Cycles which involves some changes to params.py.
2012-09-05Ruby Memory Controller: Fix clockingJoel Hestness
2012-08-28Ruby: Correct DataBlock =operatorJason Power
The =operator for the DataBlock class was incorrectly interpreting the class member m_alloc. This variable stands for whether the assigned memory for the data block needs to be freed or not by the class itself. It seems that the =operator interpreted the variable as whether the memory is assigned to the data block. This wrong interpretation was causing values not to propagate to RubySystem::m_mem_vec_ptr. This caused major issues with restoring from checkpoints when using a protocol which verified that the cache data was consistent with the backing store (i.e. MOESI-hammer).
2012-08-28Clock: Add a Cycles wrapper class and use where applicableAndreas Hansson
This patch addresses the comments and feedback on the preceding patch that reworks the clocks and now more clearly shows where cycles (relative cycle counts) are used to express time. Instead of bumping the existing patch I chose to make this a separate patch, merely to try and focus the discussion around a smaller set of changes. The two patches will be pushed together though. This changes done as part of this patch are mostly following directly from the introduction of the wrapper class, and change enough code to make things compile and run again. There are definitely more places where int/uint/Tick is still used to represent cycles, and it will take some time to chase them all down. Similarly, a lot of parameters should be changed from Param.Tick and Param.Unsigned to Param.Cycles. In addition, the use of curTick is questionable as there should not be an absolute cycle. Potential solutions can be built on top of this patch. There is a similar situation in the o3 CPU where lastRunningCycle is currently counting in Cycles, and is still an absolute time. More discussion to be had in other words. An additional change that would be appropriate in the future is to perform a similar wrapping of Tick and probably also introduce a Ticks class along with suitable operators for all these classes.
2012-08-28Clock: Rework clocks to avoid tick-to-cycle transformationsAndreas Hansson
This patch introduces the notion of a clock update function that aims to avoid costly divisions when turning the current tick into a cycle. Each clocked object advances a private (hidden) cycle member and a tick member and uses these to implement functions for getting the tick of the next cycle, or the tick of a cycle some time in the future. In the different modules using the clocks, changes are made to avoid counting in ticks only to later translate to cycles. There are a few oddities in how the O3 and inorder CPU count idle cycles, as seen by a few locations where a cycle is subtracted in the calculation. This is done such that the regression does not change any stats, but should be revisited in a future patch. Another, much needed, change that is not done as part of this patch is to introduce a new typedef uint64_t Cycle to be able to at least hint at the unit of the variables counting Ticks vs Cycles. This will be done as a follow-up patch. As an additional follow up, the thread context still uses ticks for the book keeping of last activate and last suspend and this should probably also be changed into cycles as well.
2012-08-28Port: Stricter port bind/unbind semanticsAndreas Hansson
This patch tightens up the semantics around port binding and checks that the ports that are being bound are currently not connected, and similarly connected before unbind is called. The patch consequently also changes the order of the unbind and bind for the switching of CPUs to ensure that the rules are adhered to. Previously the ports would be "over-written" without any check. There are no changes in behaviour due to this patch, and the only place where the unbind functionality is used is in the CPU.
2012-08-28Checker: Fix checker CPU portsAndreas Hansson
This patch updates how the checker CPU handles the ports such that the regressions will once again run without causing a panic. A minor amount of tidying up was also done as part of this patch.
2012-08-28swig: Disable unused value warning with llvm 3.1 compilersAndreas Hansson
This patch disables a warning for unused values which causes problems when compiling the swig-generated sources using recent llvm-based compilers like llvm-gcc and clang.
2012-08-27sim: fix overflow check in simulate because Tick is now unsignedAnthony Gutierrez
2012-08-27Ruby: remove README.debugging and Decommissioning_noteNilay Vaish
These files were relevant when Ruby was part of GEMS. They are not required any longer.
2012-08-27System: Remove redundant call to startupCPUNilay Vaish
2012-08-27Ruby: Remove RubyEventQueueNilay Vaish
This patch removes RubyEventQueue. Consumer objects now rely on RubySystem or themselves for scheduling events.
2012-08-27Ruby Memory Vector: Allow more than 4GB of memoryNilay Vaish
The memory size variable was a 32-bit int. This meant that the size of the memory was limited to 4GB. This patch changes the type of the variable to 64-bit to support larger memory sizes. Thanks to Raghuraman Balasubramanian for bringing this to notice.
2012-08-25MESI Protocol: Correct the virtual network in profile functionsNilay Vaish
The virtual network in a couple of places was incorrectly mentioned as 3 in place of 1. This is being corrected.
2012-08-25MESI Coherence Protocol: Add copyright noticeNilay Vaish
2012-08-22DMA: Refactor the DMA device and align timing and atomicAndreas Hansson
This patch does a bunch of house-keeping updates on the DMA, including indentation, and formatting, but most importantly breaks out the response handling such that it can be shared between the atomic and timing modes. It also removes a potential bug caused by the atomic handling of responses only deleting the allocated request (pkt->req) once the DMA action completes instead of doing so for every packet. Before this patch, the handling of responses was near identical for atomic and timing, but the code was simply duplicated. With this patch, the handleResp method deals with the responses in both cases. There are further updates to make after removing the NACKs, but that will be part of a separate follow-up patch. This patch does not change the behaviour of any regression.
2012-08-22Packet: Remove NACKs from packet and its use in endpointsAndreas Hansson
This patch removes the NACK frrom the packet as there is no longer any module in the system that issues them (the bridge was the only one and the previous patch removes that). The handling of NACKs was mostly avoided throughout the code base, by using e.g. panic or assert false, but in a few locations the NACKs were actually dealt with (although NACKs never occured in any of the regressions). Most notably, the DMA port will now never receive a NACK and the backoff time is thus never changed. As a consequence, the entire backoff mechanism (similar to a PCI bus) is now removed and the DMA port entirely relies on the bus performing the arbitration and issuing a retry when appropriate. This is more in line with e.g. PCIe. Surprisingly, this patch has no impact on any of the regressions. As mentioned in the patch that removes the NACK from the bridge, a follow-up patch should change the request and response buffer size for at least one regression to also verify that the system behaves as expected when the bridge fills up.
2012-08-22Bridge: Remove NACKs in the bridge and unify with packet queueAndreas Hansson
This patch removes the NACKing in the bridge, as the split request/response busses now ensure that protocol deadlocks do not occur, i.e. the message-dependency chain is broken by always allowing responses to make progress without being stalled by requests. The NACKs had limited support in the system with most components ignoring their use (with a suitable call to panic), and as the NACKs are no longer needed to avoid protocol deadlocks, the cleanest way is to simply remove them. The bridge is the starting point as this is the only place where the NACKs are created. A follow-up patch will remove the code that deals with NACKs in the endpoints, e.g. the X86 table walker and DMA port. Ultimately the type of packet can be complete removed (until someone sees a need for modelling more complex protocols, which can now be done in parts of the system since the port and interface is split). As a consequence of the NACK removal, the bridge now has to send a retry to a master if the request or response queue was full on the first attempt. This change also makes the bridge ports very similar to QueuedPorts, and a later patch will change the bridge to use these. A first step in this direction is taken by aligning the name of the member functions, as done by this patch. A bit of tidying up has also been done as part of the simplifications. Surprisingly, this patch has no impact on any of the regressions. Hence, there was never any NACKs issued. In a follow-up patch I would suggest changing the size of the bridge buffers set in FSConfig.py to also test the situation where the bridge fills up.
2012-08-22Port: Extend the QueuedPort interface and use where appropriateAndreas Hansson
This patch extends the queued port interfaces with methods for scheduling the transmission of a timing request/response. The methods are named similar to the corresponding sendTiming(Snoop)Req/Resp, replacing the "send" with "sched". As the queues are currently unbounded, the methods always succeed and hence do not return a value. This functionality was previously provided in the subclasses by calling PacketQueue::schedSendTiming with the appropriate parameters. With this change, there is no need to introduce these extra methods in the subclasses, and the use of the queued interface is more uniform and explicit.
2012-08-21Device: Remove overloaded pio_latency parameterAndreas Hansson
This patch removes the overloading of the parameter, which seems both redundant, and possibly incorrect. The PciConfigAll now also uses a Param.Latency rather than a Param.Tick. For backwards compatibility it still sets the pio_latency to 1 tick. All the comments have also been updated to not state that it is in simticks when it is not necessarily the case.
2012-08-21CPU: Remove overloaded function_trace_start parameterAndreas Hansson
This patch removes the overloading of the parameter, which seems both redundant, and possibly incorrect. The inorder CPU is particularly interesting as it uses a different name for the parameter, and never make any use of it internally.
2012-08-21PacketQueue: Allow queuing in the same tick as desired send tickAndreas Hansson
This patch allows packets to be enqueued in the same tick as they are intended to be sent. This does not imply they actually are sent that tick, although that is possible. This change is useful for module that use the queued ports primarly to avoid handling the flow control involved in sending and retrying packets.
2012-08-21EventManager: Remove test for NULL pointer in constructorAndreas Hansson
This patch tidies up the EventManager constructor and prunes a corner case where the EventManager would initialise its eventq pointer to NULL. This would cause segmentation faults on actual use and should never happen.
2012-08-21Clock: Make Tick unsigned and remove UTickAndreas Hansson
This patch makes the Tick unsigned and removes the UTick typedef. The ticks should never be negative, and there was only one major issue with removing it, caused by the o3 CPU using a -1 as an initial value. The patch has no impact on any regressions.
2012-08-21Clock: Move the clock and related functions to ClockedObjectAndreas Hansson
This patch moves the clock of the CPU, bus, and numerous devices to the new class ClockedObject, that sits in between the SimObject and MemObject in the class hierarchy. Although there are currently a fair amount of MemObjects that do not make use of the clock, they potentially should do so, e.g. the caches should at some point have the same clock as the CPU, potentially with a 1:n ratio. This patch does not introduce any new clock objects or object hierarchies (clusters, clock domains etc), but is still a step in the direction of having a more structured approach clock domains. The most contentious part of this patch is the serialisation of clocks that some of the modules (but not all) did previously. This serialisation should not be needed as the clock is set through the parameters even when restoring from the checkpoint. In other words, the state is "stored" in the Python code that creates the modules. The nextCycle methods are also simplified and the clock phase parameter of the CPU is removed (this could be part of a clock object once they are introduced).
2012-08-19Ruby Banked Array: add copyrightsNilay Vaish
2012-08-16Ruby: Add RubySystem parameter to MemoryControlJason Power
This guarantees that RubySystem object is created before the MemoryController object is created.
2012-08-16Alpha System: override startup(), instead of loadState()Nilay Vaish
Alpha System was overriding loadState() function to setup some functional event. The system tried to read/write to memory before the Ruby memory had unserialized the state. With this patch, Alpha System overrides the startup() function, and sets up functional events in this function. This works because startup() is called after Ruby memory system has unserialized the memory state.
2012-08-15O3,ARM: fix some problems with drain/switchout functionality and add Drain ↵Anthony Gutierrez
DPRINTFs This patch fixes some problems with the drain/switchout functionality for the O3 cpu and for the ARM ISA and adds some useful debug print statements. This is an incremental fix as there are still a few bugs/mem leaks with the switchout code. Particularly when switching from an O3CPU to a TimingSimpleCPU. However, when switching from O3 to O3 cores with the ARM ISA I haven't encountered any more assertion failures; now the kernel will typically panic inside of simulation.
2012-08-15sysemul: bump all linux versions of for syscal emulation to 3.0.Ali Saidi
New tool chains seem to be looking for kernel versions newer than what this this was previously set to. Also take this opportunity to change the hostname we report in uname to sim.gem5.org.
2012-08-10Ruby: Clean up topology changesJason Power
This patch moves instantiateTopology into Ruby.py and removes the mem/ruby/network/topologies directory. It also adds some extra inheritance to the topologies to clean up some issues in the existing topologies.
2012-08-08System: set kernel to null, if unspecified.Nilay Vaish
2012-08-06syscall emulation: Enabled getrlimit and getrusage for x86.Marc Orr
Added/moved rlimit constants to base linux header file. This patch is a revised version of Vince Weaver's earlier patch.
2012-08-06SETranslatingPortProxy: fix bug in tryReadString()Steve Reinhardt
Off-by-one loop termination meant that we were stuffing the terminating '\0' into the std::string value, which makes for difficult-to-debug string comparison failures.
2012-08-06process: add progName() virtual functionSteve Reinhardt
This replaces a (potentially uninitialized) string field with a virtual function so that we can have a safe interface without requiring changes to the eio code.