X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmem%2Fpacket.hh;h=3a7286a697caed5cb95bb54b47b6ac3d650d08e4;hb=012556ecf92da1b5527fece58417725970c3e64a;hp=c7d28010cb453e3a1c9d2d18ed34d1cd5c16ae5b;hpb=9f18764441831b08b8700a8895ae7316f0ed7508;p=gem5.git diff --git a/src/mem/packet.hh b/src/mem/packet.hh index c7d28010c..3a7286a69 100644 --- a/src/mem/packet.hh +++ b/src/mem/packet.hh @@ -58,10 +58,8 @@ typedef std::list PacketList; #define NO_ALLOCATE 1 << 5 #define SNOOP_COMMIT 1 << 6 -//For statistics we need max number of commands, hard code it at -//20 for now. @todo fix later -#define NUM_MEM_CMDS 1 << 9 - +//for now. @todo fix later +#define NUM_MEM_CMDS 1 << 11 /** * A Packet is used to encapsulate a transfer between two objects in * the memory system (e.g., the L1 and L2 cache). (In contrast, a @@ -94,7 +92,6 @@ class Packet * be called on it rather than simply delete.*/ bool arrayData; - /** The address of the request. This address could be virtual or * physical, depending on the system configuration. */ Addr addr; @@ -126,6 +123,12 @@ class Packet /** Used to calculate latencies for each packet.*/ Tick time; + /** The time at which the packet will be fully transmitted */ + Tick finishTime; + + /** The time at which the first chunk of the packet will be transmitted */ + Tick firstWordTime; + /** The special destination address indicating that the packet * should be routed based on its address. */ static const short Broadcast = -1; @@ -164,6 +167,8 @@ class Packet private: /** List of command attributes. */ + // If you add a new CommandAttribute, make sure to increase NUM_MEM_CMDS + // as well. enum CommandAttribute { IsRead = 1 << 0, @@ -174,7 +179,9 @@ class Packet IsResponse = 1 << 5, NeedsResponse = 1 << 6, IsSWPrefetch = 1 << 7, - IsHWPrefetch = 1 << 8 + IsHWPrefetch = 1 << 8, + IsUpgrade = 1 << 9, + HasData = 1 << 10 }; public: @@ -183,21 +190,23 @@ class Packet { InvalidCmd = 0, ReadReq = IsRead | IsRequest | NeedsResponse, - WriteReq = IsWrite | IsRequest | NeedsResponse, - WriteReqNoAck = IsWrite | IsRequest, - ReadResp = IsRead | IsResponse | NeedsResponse, + WriteReq = IsWrite | IsRequest | NeedsResponse | HasData, + WriteReqNoAck = IsWrite | IsRequest | HasData, + ReadResp = IsRead | IsResponse | NeedsResponse | HasData, WriteResp = IsWrite | IsResponse | NeedsResponse, - Writeback = IsWrite | IsRequest, + Writeback = IsWrite | IsRequest | HasData, SoftPFReq = IsRead | IsRequest | IsSWPrefetch | NeedsResponse, HardPFReq = IsRead | IsRequest | IsHWPrefetch | NeedsResponse, - SoftPFResp = IsRead | IsResponse | IsSWPrefetch | NeedsResponse, - HardPFResp = IsRead | IsResponse | IsHWPrefetch | NeedsResponse, + SoftPFResp = IsRead | IsResponse | IsSWPrefetch + | NeedsResponse | HasData, + HardPFResp = IsRead | IsResponse | IsHWPrefetch + | NeedsResponse | HasData, InvalidateReq = IsInvalidate | IsRequest, - WriteInvalidateReq = IsWrite | IsInvalidate | IsRequest, - UpgradeReq = IsInvalidate | IsRequest | NeedsResponse, - UpgradeResp = IsInvalidate | IsResponse | NeedsResponse, + WriteInvalidateReq = IsWrite | IsInvalidate | IsRequest | HasData, + UpgradeReq = IsInvalidate | IsRequest | IsUpgrade, ReadExReq = IsRead | IsInvalidate | IsRequest | NeedsResponse, - ReadExResp = IsRead | IsInvalidate | IsResponse | NeedsResponse + ReadExResp = IsRead | IsInvalidate | IsResponse + | NeedsResponse | HasData }; /** Return the string name of the cmd field (for debugging and @@ -219,6 +228,7 @@ class Packet bool isResponse() { return (cmd & IsResponse) != 0; } bool needsResponse() { return (cmd & NeedsResponse) != 0; } bool isInvalidate() { return (cmd & IsInvalidate) != 0; } + bool hasData() { return (cmd & HasData) != 0; } bool isCacheFill() { return (flags & CACHE_LINE_FILL) != 0; } bool isNoAllocate() { return (flags & NO_ALLOCATE) != 0; } @@ -312,7 +322,7 @@ class Packet * for returning as a response to that request. Used for timing * accesses only. For atomic and functional accesses, the * request packet is always implicitly passed back *without* - * modifying the command or destination fields, so this function + * modifying the destination fields, so this function * should not be called. */ void makeTimingResponse() { assert(needsResponse()); @@ -320,11 +330,27 @@ class Packet int icmd = (int)cmd; icmd &= ~(IsRequest); icmd |= IsResponse; + if (isRead()) + icmd |= HasData; + if (isWrite()) + icmd &= ~HasData; cmd = (Command)icmd; dest = src; srcValid = false; } + /** Take a request packet and modify it in place to be suitable + * for returning as a response to that request. + */ + void makeAtomicResponse() { + assert(needsResponse()); + assert(isRequest()); + int icmd = (int)cmd; + icmd &= ~(IsRequest); + icmd |= IsResponse; + cmd = (Command)icmd; + } + /** Take a request packet that has been returned as NACKED and modify it so * that it can be sent out again. Only packets that need a response can be * NACKED, so verify that that is true. */