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path: root/src/mem/packet.hh
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2012-09-25mem: Add a gasket that allows memory ranges to be re-mapped.Ali Saidi
For example if DRAM is at two locations and mirrored this patch allows the mirroring to occur.
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.
2012-06-05sim: Remove FastAllocAli Saidi
While FastAlloc provides a small performance increase (~1.5%) over regular malloc it isn't thread safe. After removing FastAlloc and using tcmalloc I've seen a performance increase of 12% over libc malloc when running twolf for ARM.
2012-05-30Packet: Unify the use of PortID in packet and portAndreas Hansson
This patch removes the Packet::NodeID typedef and unifies it with the Port::PortId. The src and dest fields in the packet are used to hold a port id (e.g. in the bus), and thus the two should actually be the same. The typedef PortID is now global (in base/types.hh) and aligned with the ThreadID in terms of capitalisation and naming of the InvalidPortID constant. Before this patch, two flags were used for valid destination and source, rather than relying on a named value (InvalidPortID), and this is now redundant, as the src and dest field themselves are sufficient to tell whether the current value is a valid port identifier or not. Consequently, the VALID_SRC and VALID_DST are removed. As part of the cleaning up, a number of int parameters and local variables are updated to use PortID. Note that Ruby still has its own NodeID typedef. Furthermore, the MemObject getMaster/SlavePort still has an int idx parameter with a default value of -1 which should eventually change to PortID idx = InvalidPortID.
2012-05-30Packet: Updated comments for src and dest fieldsAndreas Hansson
This patch updates the comments for the src and dest fields to reflect their actual use. Due to a number of patches (e.g. removing the Broadcast flag), the old comments are no longer indicative of the current usage.
2012-05-23Packet: Cleaning up packet command and attributeAndreas Hansson
This patch removes unused commands and attributes from the packet to avoid any confusion. It is part of an effort to clear up how and where different commands and attributes are used.
2012-04-14MEM: Remove the Broadcast destination from the packetAndreas Hansson
This patch simplifies the packet by removing the broadcast flag and instead more firmly relying on (and enforcing) the semantics of transactions in the classic memory system, i.e. request packets are routed from a master to a slave based on the address, and when they are created they have neither a valid source, nor destination. On their way to the slave, the request packet is updated with a source field for all modules that multiplex packets from multiple master (e.g. a bus). When a request packet is turned into a response packet (at the final slave), it moves the potentially populated source field to the destination field, and the response packet is routed through any multiplexing components back to the master based on the destination field. Modules that connect multiplexing components, such as caches and bridges store any existing source and destination field in the sender state as a stack (just as before). The packet constructor is simplified in that there is no longer a need to pass the Packet::Broadcast as the destination (this was always the case for the classic memory system). In the case of Ruby, rather than using the parameter to the constructor we now rely on setDest, as there is already another three-argument constructor in the packet class. In many places where the packet information was printed as part of DPRINTFs, request packets would be printed with a numeric "dest" that would always be -1 (Broadcast) and that field is now removed from the printing.
2012-01-31clang: Enable compiling gem5 using clang 2.9 and 3.0Koan-Sin Tan
This patch adds the necessary flags to the SConstruct and SConscript files for compiling using clang 2.9 and later (on Ubuntu et al and OSX XCode 4.2), and also cleans up a bunch of compiler warnings found by clang. Most of the warnings are related to hidden virtual functions, comparisons with unsigneds >= 0, and if-statements with empty bodies. A number of mismatches between struct and class are also fixed. clang 2.8 is not working as it has problems with class names that occur in multiple namespaces (e.g. Statistics in kernel_stats.hh). clang has a bug (http://llvm.org/bugs/show_bug.cgi?id=7247) which causes confusion between the container std::set and the function Packet::set, and this is currently addressed by not including the entire namespace std, but rather selecting e.g. "using std::vector" in the appropriate places.
2012-01-23MemCmd: Add a command for invalidation requests to LSQNilay Vaish
This command will be sent from the memory system (Ruby) to the LSQ of an O3 CPU so that the LSQ, if it needs to, invalidates the address in the request packet.
2012-01-09Packet: Add derived class FunctionalPacket to enable partial functional readsGeoffrey Blake
This adds the derived class FunctionalPacket to fix a long standing deficiency in the Packet class where it was unable to handle finding data to partially satisfy a functional access. Made this a derived class as functional accesses are used only in certain contexts and to not add any additional overhead to the existing Packet class.
2011-06-30Ruby: Add support for functional accessesBrad Beckmann ext:(%2C%20Nilay%20Vaish%20%3Cnilay%40cs.wisc.edu%3E)
This patch rpovides functional access support in Ruby. Currently only the M5Port of RubyPort supports functional accesses. The support for functional through the PioPort will be added as a separate patch.
2011-04-15includes: sort all includesNathan Binkert
2011-03-28This patch supports cache flushing in MOESI_hammerSomayeh Sardashti
2011-02-06mem: Added support for Null data packetBrad Beckmann
The packet now identifies whether static or dynamic data has been allocated and is used by Ruby to determine whehter to copy the data pointer into the ruby request. Subsequently, Ruby can be told not to update phys memory when receiving packets.
2011-01-07Replace curTick global variable with accessor functions.Steve Reinhardt
This step makes it easy to replace the accessor functions (which still access a global variable) with ones that access per-thread curTick values.
2010-09-30CPU/Cache: Fix some errors exposed by valgrindAli Saidi
2010-09-21cache: improve coherence handling of writebacksSteve Reinhardt
If we write back an exclusive copy, we now mark it as such, so the cache receiving the writeback can mark its copy as exclusive. This avoids some unnecessary upgrade requests when a cache later tries to re-acquire exclusive access to the block.
2010-09-09cache: fail SC when invalidated while waiting for busSteve Reinhardt
Corrects an oversight in cset f97b62be544f. The fix there only failed queued SCUpgradeReq packets that encountered an invalidation, which meant that the upgrade had to reach the L2 cache. To handle pending requests in the L1 we must similarly fail StoreCondReq packets too.
2010-08-25mem: fix dumb typo in copyrightsSteve Reinhardt
2010-08-20ruby: fix ruby llsc support to sync sc outcomesBrad Beckmann
Added support so that ruby can determine the outcome of store conditional operations and reflect that outcome to M5 physical memory and cpus.
2010-06-16cache: fail store conditionals when upgrade loses raceSteve Reinhardt
Requires new "SCUpgradeReq" message that marks upgrades for store conditionals, so downstream caches can fail these when they run into invalidations. See http://www.m5sim.org/flyspray/task/197
2010-06-16cache: fix dirty bit settingSteve Reinhardt
Only set the dirty bit when we actually write to a block (not if we thought we might but didn't, as in a failed SC or CAS). This requires makeing sure the dirty bit stays set when we get an exclusive (writable) copy in a cache-to-cache transfer from another owner, which n turn requires copying the mem-inhibit flag from timing-mode requests to their associated responses.
2010-03-12packet: add a method to set the sizeNathan Binkert
2009-11-18m5: Added isValidSrc and isValidDest calls to packet.hhBrad Beckmann
2009-06-04types: clean up types, especially signed vs unsignedNathan Binkert
2009-05-29request: add accessor and constructor for setting time other than curTickNathan Binkert
2009-05-17includes: sort includes againNathan Binkert
2009-05-17types: Move stuff for global types into src/base/types.hhNathan Binkert
--HG-- rename : src/sim/host.hh => src/base/types.hh
2009-04-20request: split public and private flags into separate fields.Steve Reinhardt
This frees up needed space for more public flags. Also: - remove unused Request accessor methods - make Packet use public Request accessors, so it need not be a friend
2009-04-19Mem: Change isLlsc to isLLSC.Gabe Black
2009-04-19Memory: Rename LOCKED for load locked store conditional to LLSC.Gabe Black
2008-12-06flags: Change naming of functions to be clearerNathan Binkert
2008-11-14Fix a bunch of bugs I introduced when I changed the flags stuff for packets.Nathan Binkert
I did some of the flags and assertions wrong. Thanks to Brad Beckmann for pointing this out. I should have run the opt regressions instead of the fast. I also screwed up some of the logical functions in the Flags class.
2008-11-10style: clean up the Packet stuffNathan Binkert
2008-10-12Create a message port for sending messages as apposed to reading/writing a ↵Gabe Black
memory range.
2008-07-15Use ReadResp instead of LoadLockedResp for LoadLockedReq responses.Steve Reinhardt
2008-03-24Delete the Request for a no-response PacketSteve Reinhardt
when the Packet is deleted, since the requester can't possibly do it. --HG-- extra : convert_revision : 8571b144ecb3c70efc06d09faa8b3161fb58352d
2008-03-24Don't FastAlloc MSHRs since we don't allocate them on the fly.Steve Reinhardt
--HG-- extra : convert_revision : 02775cfb460afe6df0df0938c62cccd93a71e775
2008-01-02Add ReadRespWithInvalidate to handle multi-level coherence situationSteve Reinhardt
where we defer a response to a read from a far-away cache A, then later defer a ReadExcl from a cache B on the same bus as us. We'll assert MemInhibit in both cases, but in the latter case MemInhibit will keep the invalidation from reaching cache A. This special response tells cache A that it gets the block to satisfy its read, but must immediately invalidate it. --HG-- extra : convert_revision : f85c8b47bb30232da37ac861b50a6539dc81161b
2008-01-02Additional comments and helper functions for PrintReq.Steve Reinhardt
--HG-- extra : convert_revision : 7eadf9b7db8c0289480f771271b6efe2400006d4
2008-01-02Add functional PrintReq command for memory-system debugging.Steve Reinhardt
--HG-- extra : convert_revision : 73b753e57c355b7e6873f047ddc8cb371c3136b7
2007-08-26Merge with headGabe Black
--HG-- extra : convert_revision : cc73b9aaf73e9dacf52f3350fa591e67ca4ccee6
2007-07-27packet: get rid of unused intersect() function.Steve Reinhardt
--HG-- extra : convert_revision : f0a2947ccc49e0d18bc17a59371fa396d9ebd6c0
2007-07-26Add downward express snoops for invalidations.Steve Reinhardt
--HG-- extra : convert_revision : 4916fa9721d727d8416ad8c07df3a8171d02b2b4
2007-07-22Replace lowerMSHRPending flag with more robust schemeSteve Reinhardt
based on following Packet senderState links. --HG-- extra : convert_revision : 9027d59bd7242aa0e4275bf94d8b1fb27bd59d79
2007-07-22Replace DeferredSnoop flag with LowerMSHRPending flag.Steve Reinhardt
Turns out DeferredSnoop isn't quite the right bit of info we needed... see new comment in cache_impl.hh. --HG-- extra : convert_revision : a38de8c1677a37acafb743b7074ef88b21d3b7be
2007-07-21Several more fixes for multi-level timing coherence.Steve Reinhardt
- Add "deferred snoop" flag to Packet so upper-level caches can distinguish whether lower-level cache request was in-service or not at the time of the original snoop. - Revamp response handling to properly handle deferred snoops on non-cache-fill requests (i.e. upgrades). - Make sure forwarded writebacks are kept in write buffer at lower-level caches so they get snooped properly. --HG-- extra : convert_revision : 17f8a3772a1ae31a16991a53f8225ddf54d31fc9
2007-07-15Fix up a bunch of multilevel coherence issues.Steve Reinhardt
Atomic mode seems to work. Timing is closer but not there yet. --HG-- extra : convert_revision : 0dea5c3d4b973d009e9d4a4c21b9cad15961d56f
2007-07-14Fix bug in copying packet with static data pointer.Steve Reinhardt
--HG-- extra : convert_revision : 2fcf99f050d73e007433c1db2475f2893c5961a0
2007-06-30Get rid of obsolete fixPacket() functions.Steve Reinhardt
Handled by Packet::checkFunctional() now. --HG-- extra : convert_revision : 63642254e2789c80a369ac269f317ec054ffe3c0