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39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 * Authors: Ron Dreslinski
49 * Declaration of the Packet class.
52 #ifndef __MEM_PACKET_HH__
53 #define __MEM_PACKET_HH__
59 #include "base/cast.hh"
60 #include "base/compiler.hh"
61 #include "base/flags.hh"
62 #include "base/misc.hh"
63 #include "base/printable.hh"
64 #include "base/types.hh"
65 #include "mem/request.hh"
66 #include "sim/core.hh"
69 typedef Packet *PacketPtr;
70 typedef uint8_t* PacketDataPtr;
71 typedef std::list<PacketPtr> PacketList;
79 * List of all commands associated with a packet.
86 ReadRespWithInvalidate,
94 // WriteInvalidateReq transactions used to be generated by the
95 // DMA ports when writing full blocks to memory, however, it
96 // is not used anymore since we put the I/O cache in place to
97 // deal with partial block writes. Hence, WriteInvalidateReq
98 // and WriteInvalidateResp are currently unused. The
99 // implication is that the I/O cache does read-exclusive
100 // operations on every full-cache-block DMA, and ultimately
101 // this needs to be fixed.
105 SCUpgradeReq, // Special "weak" upgrade for StoreCond
107 SCUpgradeFailReq, // Failed SCUpgradeReq in MSHR (never sent)
108 UpgradeFailResp, // Valid for SCUpgradeReq only
113 StoreCondFailReq, // Failed StoreCondReq in MSHR (never sent)
120 // @TODO these should be classified as responses rather than
121 // requests; coding them as requests initially for backwards
123 InvalidDestError, // packet dest field invalid
124 BadAddressError, // memory address invalid
125 FunctionalReadError, // unable to fulfill functional read
126 FunctionalWriteError, // unable to fulfill functional write
127 // Fake simulator-only commands
128 PrintReq, // Print state matching address
129 FlushReq, //request for a cache flush
130 InvalidationReq, // request for address to be invalidated from lsq
136 * List of command attributes.
140 IsRead, //!< Data flows from responder to requester
141 IsWrite, //!< Data flows from requester to responder
144 NeedsExclusive, //!< Requires exclusive copy to complete in-cache
145 IsRequest, //!< Issued by requester
146 IsResponse, //!< Issue by responder
147 NeedsResponse, //!< Requester needs response from target
150 IsLlsc, //!< Alpha/MIPS LL or SC access
151 HasData, //!< There is an associated payload
152 IsError, //!< Error response
153 IsPrint, //!< Print state matching address (for debugging)
154 IsFlush, //!< Flush the address from caches
155 NUM_COMMAND_ATTRIBUTES
159 * Structure that defines attributes and other data associated
164 /// Set of attribute flags.
165 const std::bitset<NUM_COMMAND_ATTRIBUTES> attributes;
166 /// Corresponding response for requests; InvalidCmd if no
167 /// response is applicable.
168 const Command response;
169 /// String representation (for printing)
170 const std::string str;
173 /// Array to map Command enum to associated info.
174 static const CommandInfo commandInfo[];
181 testCmdAttrib(MemCmd::Attribute attrib) const
183 return commandInfo[cmd].attributes[attrib] != 0;
188 bool isRead() const { return testCmdAttrib(IsRead); }
189 bool isWrite() const { return testCmdAttrib(IsWrite); }
190 bool isUpgrade() const { return testCmdAttrib(IsUpgrade); }
191 bool isRequest() const { return testCmdAttrib(IsRequest); }
192 bool isResponse() const { return testCmdAttrib(IsResponse); }
193 bool needsExclusive() const { return testCmdAttrib(NeedsExclusive); }
194 bool needsResponse() const { return testCmdAttrib(NeedsResponse); }
195 bool isInvalidate() const { return testCmdAttrib(IsInvalidate); }
196 bool hasData() const { return testCmdAttrib(HasData); }
197 bool isReadWrite() const { return isRead() && isWrite(); }
198 bool isLLSC() const { return testCmdAttrib(IsLlsc); }
199 bool isError() const { return testCmdAttrib(IsError); }
200 bool isPrint() const { return testCmdAttrib(IsPrint); }
201 bool isFlush() const { return testCmdAttrib(IsFlush); }
204 responseCommand() const
206 return commandInfo[cmd].response;
209 /// Return the string to a cmd given by idx.
210 const std::string &toString() const { return commandInfo[cmd].str; }
211 int toInt() const { return (int)cmd; }
213 MemCmd(Command _cmd) : cmd(_cmd) { }
214 MemCmd(int _cmd) : cmd((Command)_cmd) { }
215 MemCmd() : cmd(InvalidCmd) { }
217 bool operator==(MemCmd c2) const { return (cmd == c2.cmd); }
218 bool operator!=(MemCmd c2) const { return (cmd != c2.cmd); }
222 * A Packet is used to encapsulate a transfer between two objects in
223 * the memory system (e.g., the L1 and L2 cache). (In contrast, a
224 * single Request travels all the way from the requester to the
225 * ultimate destination and back, possibly being conveyed by several
226 * different Packets along the way.)
228 class Packet : public Printable
231 typedef uint32_t FlagsType;
232 typedef ::Flags<FlagsType> Flags;
235 static const FlagsType PUBLIC_FLAGS = 0x00000000;
236 static const FlagsType PRIVATE_FLAGS = 0x00007F0F;
237 static const FlagsType COPY_FLAGS = 0x0000000F;
239 static const FlagsType SHARED = 0x00000001;
240 // Special control flags
241 /// Special timing-mode atomic snoop for multi-level coherence.
242 static const FlagsType EXPRESS_SNOOP = 0x00000002;
243 /// Does supplier have exclusive copy?
244 /// Useful for multi-level coherence.
245 static const FlagsType SUPPLY_EXCLUSIVE = 0x00000004;
246 // Snoop response flags
247 static const FlagsType MEM_INHIBIT = 0x00000008;
248 /// Are the 'addr' and 'size' fields valid?
249 static const FlagsType VALID_ADDR = 0x00000100;
250 static const FlagsType VALID_SIZE = 0x00000200;
251 /// Is the data pointer set to a value that shouldn't be freed
252 /// when the packet is destroyed?
253 static const FlagsType STATIC_DATA = 0x00001000;
254 /// The data pointer points to a value that should be freed when
255 /// the packet is destroyed.
256 static const FlagsType DYNAMIC_DATA = 0x00002000;
257 /// the data pointer points to an array (thus delete []) needs to
258 /// be called on it rather than simply delete.
259 static const FlagsType ARRAY_DATA = 0x00004000;
260 /// suppress the error if this packet encounters a functional
262 static const FlagsType SUPPRESS_FUNC_ERROR = 0x00008000;
267 typedef MemCmd::Command Command;
269 /// The command field of the packet.
272 /// A pointer to the original request.
277 * A pointer to the data being transfered. It can be differnt
278 * sizes at each level of the heirarchy so it belongs in the
279 * packet, not request. This may or may not be populated when a
280 * responder recieves the packet. If not populated it memory should
285 /// The address of the request. This address could be virtual or
286 /// physical, depending on the system configuration.
289 /// The size of the request or transfer.
293 * Source port identifier set on a request packet to enable
294 * appropriate routing of the responses. The source port
295 * identifier is set by any multiplexing component, e.g. a bus, as
296 * the timing responses need this information to be routed back to
297 * the appropriate port at a later point in time. The field can be
298 * updated (over-written) as the request packet passes through
299 * additional multiplexing components, and it is their
300 * responsibility to remember the original source port identifier,
301 * for example by using an appropriate sender state. The latter is
302 * done in the cache and bridge.
307 * Destination port identifier that is present on all response
308 * packets that passed through a multiplexing component as a
309 * request packet. The source port identifier is turned into a
310 * destination port identifier when the packet is turned into a
311 * response, and the destination is used, e.g. by the bus, to
312 * select the appropriate path through the interconnect.
317 * The original value of the command field. Only valid when the
318 * current command field is an error condition; in that case, the
319 * previous contents of the command field are copied here. This
320 * field is *not* set on non-error responses.
325 * These values specify the range of bytes found that satisfy a
328 uint16_t bytesValidStart;
329 uint16_t bytesValidEnd;
334 * The extra delay from seeing the packet until the first word is
335 * transmitted by the bus that provided it (if any). This delay is
336 * used to communicate the bus waiting time to the neighbouring
337 * object (e.g. a cache) that actually makes the packet wait. As
338 * the delay is relative, a 32-bit unsigned should be sufficient.
340 uint32_t busFirstWordDelay;
343 * The extra delay from seeing the packet until the last word is
344 * transmitted by the bus that provided it (if any). Similar to
345 * the first word time, this is used to make up for the fact that
346 * the bus does not make the packet wait. As the delay is relative,
347 * a 32-bit unsigned should be sufficient.
349 uint32_t busLastWordDelay;
352 * A virtual base opaque structure used to hold state associated
353 * with the packet (e.g., an MSHR), specific to a MemObject that
354 * sees the packet. A pointer to this state is returned in the
355 * packet's response so that the MemObject in question can quickly
356 * look up the state needed to process it. A specific subclass
357 * would be derived from this to carry state specific to a
358 * particular sending device.
360 * As multiple MemObjects may add their SenderState throughout the
361 * memory system, the SenderStates create a stack, where a
362 * MemObject can add a new Senderstate, as long as the
363 * predecessing SenderState is restored when the response comes
364 * back. For this reason, the predecessor should always be
365 * populated with the current SenderState of a packet before
366 * modifying the senderState field in the request packet.
370 SenderState* predecessor;
371 SenderState() : predecessor(NULL) {}
372 virtual ~SenderState() {}
376 * Object used to maintain state of a PrintReq. The senderState
377 * field of a PrintReq should always be of this type.
379 class PrintReqState : public SenderState
383 * An entry in the label stack.
385 struct LabelStackEntry
387 const std::string label;
390 LabelStackEntry(const std::string &_label, std::string *_prefix);
393 typedef std::list<LabelStackEntry> LabelStack;
394 LabelStack labelStack;
396 std::string *curPrefixPtr;
402 PrintReqState(std::ostream &os, int verbosity = 0);
406 * Returns the current line prefix.
408 const std::string &curPrefix() { return *curPrefixPtr; }
411 * Push a label onto the label stack, and prepend the given
412 * prefix string onto the current prefix. Labels will only be
413 * printed if an object within the label's scope is printed.
415 void pushLabel(const std::string &lbl,
416 const std::string &prefix = " ");
419 * Pop a label off the label stack.
424 * Print all of the pending unprinted labels on the
425 * stack. Called by printObj(), so normally not called by
426 * users unless bypassing printObj().
431 * Print a Printable object to os, because it matched the
432 * address on a PrintReq.
434 void printObj(Printable *obj);
438 * This packet's sender state. Devices should use dynamic_cast<>
439 * to cast to the state appropriate to the sender. The intent of
440 * this variable is to allow a device to attach extra information
441 * to a request. A response packet must return the sender state
442 * that was attached to the original request (even if a new packet
445 SenderState *senderState;
448 * Push a new sender state to the packet and make the current
449 * sender state the predecessor of the new one. This should be
450 * prefered over direct manipulation of the senderState member
453 * @param sender_state SenderState to push at the top of the stack
455 void pushSenderState(SenderState *sender_state);
458 * Pop the top of the state stack and return a pointer to it. This
459 * assumes the current sender state is not NULL. This should be
460 * preferred over direct manipulation of the senderState member
463 * @return The current top of the stack
465 SenderState *popSenderState();
468 * Go through the sender state stack and return the first instance
469 * that is of type T (as determined by a dynamic_cast). If there
470 * is no sender state of type T, NULL is returned.
472 * @return The topmost state of type T
474 template <typename T>
475 T * findNextSenderState() const
478 SenderState* sender_state = senderState;
479 while (t == NULL && sender_state != NULL) {
480 t = dynamic_cast<T*>(sender_state);
481 sender_state = sender_state->predecessor;
486 /// Return the string name of the cmd field (for debugging and
488 const std::string &cmdString() const { return cmd.toString(); }
490 /// Return the index of this command.
491 inline int cmdToIndex() const { return cmd.toInt(); }
493 bool isRead() const { return cmd.isRead(); }
494 bool isWrite() const { return cmd.isWrite(); }
495 bool isUpgrade() const { return cmd.isUpgrade(); }
496 bool isRequest() const { return cmd.isRequest(); }
497 bool isResponse() const { return cmd.isResponse(); }
498 bool needsExclusive() const { return cmd.needsExclusive(); }
499 bool needsResponse() const { return cmd.needsResponse(); }
500 bool isInvalidate() const { return cmd.isInvalidate(); }
501 bool hasData() const { return cmd.hasData(); }
502 bool isReadWrite() const { return cmd.isReadWrite(); }
503 bool isLLSC() const { return cmd.isLLSC(); }
504 bool isError() const { return cmd.isError(); }
505 bool isPrint() const { return cmd.isPrint(); }
506 bool isFlush() const { return cmd.isFlush(); }
509 void assertMemInhibit() { flags.set(MEM_INHIBIT); }
510 bool memInhibitAsserted() { return flags.isSet(MEM_INHIBIT); }
511 void assertShared() { flags.set(SHARED); }
512 bool sharedAsserted() { return flags.isSet(SHARED); }
514 // Special control flags
515 void setExpressSnoop() { flags.set(EXPRESS_SNOOP); }
516 bool isExpressSnoop() { return flags.isSet(EXPRESS_SNOOP); }
517 void setSupplyExclusive() { flags.set(SUPPLY_EXCLUSIVE); }
518 void clearSupplyExclusive() { flags.clear(SUPPLY_EXCLUSIVE); }
519 bool isSupplyExclusive() { return flags.isSet(SUPPLY_EXCLUSIVE); }
520 void setSuppressFuncError() { flags.set(SUPPRESS_FUNC_ERROR); }
521 bool suppressFuncError() { return flags.isSet(SUPPRESS_FUNC_ERROR); }
523 // Network error conditions... encapsulate them as methods since
524 // their encoding keeps changing (from result field to command
529 assert(isResponse());
530 cmd = MemCmd::BadAddressError;
533 bool hadBadAddress() const { return cmd == MemCmd::BadAddressError; }
534 void copyError(Packet *pkt) { assert(pkt->isError()); cmd = pkt->cmd; }
536 bool isSrcValid() const { return src != InvalidPortID; }
537 /// Accessor function to get the source index of the packet.
538 PortID getSrc() const { assert(isSrcValid()); return src; }
539 /// Accessor function to set the source index of the packet.
540 void setSrc(PortID _src) { src = _src; }
541 /// Reset source field, e.g. to retransmit packet on different bus.
542 void clearSrc() { src = InvalidPortID; }
544 bool isDestValid() const { return dest != InvalidPortID; }
545 /// Accessor function for the destination index of the packet.
546 PortID getDest() const { assert(isDestValid()); return dest; }
547 /// Accessor function to set the destination index of the packet.
548 void setDest(PortID _dest) { dest = _dest; }
549 /// Reset destination field, e.g. to turn a response into a request again.
550 void clearDest() { dest = InvalidPortID; }
552 Addr getAddr() const { assert(flags.isSet(VALID_ADDR)); return addr; }
554 * Update the address of this packet mid-transaction. This is used
555 * by the address mapper to change an already set address to a new
556 * one based on the system configuration. It is intended to remap
557 * an existing address, so it asserts that the current address is
560 void setAddr(Addr _addr) { assert(flags.isSet(VALID_ADDR)); addr = _addr; }
562 unsigned getSize() const { assert(flags.isSet(VALID_SIZE)); return size; }
563 Addr getOffset(int blkSize) const { return getAddr() & (Addr)(blkSize - 1); }
566 * It has been determined that the SC packet should successfully update
567 * memory. Therefore, convert this SC packet to a normal write.
574 cmd = MemCmd::WriteReq;
578 * When ruby is in use, Ruby will monitor the cache line and thus M5
579 * phys memory should treat LL ops as normal reads.
586 cmd = MemCmd::ReadReq;
590 * Constructor. Note that a Request object must be constructed
591 * first, but the Requests's physical address and size fields need
592 * not be valid. The command must be supplied.
594 Packet(Request *_req, MemCmd _cmd)
595 : cmd(_cmd), req(_req), data(NULL),
596 src(InvalidPortID), dest(InvalidPortID),
597 bytesValidStart(0), bytesValidEnd(0),
598 busFirstWordDelay(0), busLastWordDelay(0),
601 if (req->hasPaddr()) {
602 addr = req->getPaddr();
603 flags.set(VALID_ADDR);
605 if (req->hasSize()) {
606 size = req->getSize();
607 flags.set(VALID_SIZE);
612 * Alternate constructor if you are trying to create a packet with
613 * a request that is for a whole block, not the address from the
614 * req. this allows for overriding the size/addr of the req.
616 Packet(Request *_req, MemCmd _cmd, int _blkSize)
617 : cmd(_cmd), req(_req), data(NULL),
618 src(InvalidPortID), dest(InvalidPortID),
619 bytesValidStart(0), bytesValidEnd(0),
620 busFirstWordDelay(0), busLastWordDelay(0),
623 if (req->hasPaddr()) {
624 addr = req->getPaddr() & ~(_blkSize - 1);
625 flags.set(VALID_ADDR);
628 flags.set(VALID_SIZE);
632 * Alternate constructor for copying a packet. Copy all fields
633 * *except* if the original packet's data was dynamic, don't copy
634 * that, as we can't guarantee that the new packet's lifetime is
635 * less than that of the original packet. In this case the new
636 * packet should allocate its own data.
638 Packet(Packet *pkt, bool clearFlags = false)
639 : cmd(pkt->cmd), req(pkt->req),
640 data(pkt->flags.isSet(STATIC_DATA) ? pkt->data : NULL),
641 addr(pkt->addr), size(pkt->size), src(pkt->src), dest(pkt->dest),
642 bytesValidStart(pkt->bytesValidStart),
643 bytesValidEnd(pkt->bytesValidEnd),
644 busFirstWordDelay(pkt->busFirstWordDelay),
645 busLastWordDelay(pkt->busLastWordDelay),
646 senderState(pkt->senderState)
649 flags.set(pkt->flags & COPY_FLAGS);
651 flags.set(pkt->flags & (VALID_ADDR|VALID_SIZE));
652 flags.set(pkt->flags & STATIC_DATA);
657 * clean up packet variables
661 // If this is a request packet for which there's no response,
662 // delete the request object here, since the requester will
663 // never get the chance.
664 if (req && isRequest() && !needsResponse())
670 * Reinitialize packet address and size from the associated
671 * Request object, and reset other fields that may have been
672 * modified by a previous transaction. Typically called when a
673 * statically allocated Request/Packet pair is reused for multiple
679 assert(req->hasPaddr());
681 addr = req->getPaddr();
682 size = req->getSize();
685 dest = InvalidPortID;
688 busFirstWordDelay = 0;
689 busLastWordDelay = 0;
691 flags.set(VALID_ADDR|VALID_SIZE);
696 * Take a request packet and modify it in place to be suitable for
697 * returning as a response to that request. The source field is
698 * turned into the destination, and subsequently cleared. Note
699 * that the latter is not necessary for atomic requests, but
700 * causes no harm as neither field is valid.
705 assert(needsResponse());
708 cmd = cmd.responseCommand();
710 // responses are never express, even if the snoop that
711 // triggered them was
712 flags.clear(EXPRESS_SNOOP);
731 setFunctionalResponseStatus(bool success)
735 cmd = MemCmd::FunctionalWriteError;
737 cmd = MemCmd::FunctionalReadError;
743 setSize(unsigned size)
745 assert(!flags.isSet(VALID_SIZE));
748 flags.set(VALID_SIZE);
753 * Set the data pointer to the following value that should not be
756 template <typename T>
760 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA));
761 data = (PacketDataPtr)p;
762 flags.set(STATIC_DATA);
766 * Set the data pointer to a value that should have delete []
769 template <typename T>
771 dataDynamicArray(T *p)
773 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA));
774 data = (PacketDataPtr)p;
775 flags.set(DYNAMIC_DATA|ARRAY_DATA);
779 * set the data pointer to a value that should have delete called
782 template <typename T>
786 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA));
787 data = (PacketDataPtr)p;
788 flags.set(DYNAMIC_DATA);
792 * get a pointer to the data ptr.
794 template <typename T>
796 getPtr(bool null_ok = false)
798 assert(null_ok || flags.isSet(STATIC_DATA|DYNAMIC_DATA));
803 * return the value of what is pointed to in the packet.
805 template <typename T>
809 * set the value in the data pointer to v.
811 template <typename T>
815 * Copy data into the packet from the provided pointer.
820 if (p != getPtr<uint8_t>())
821 std::memcpy(getPtr<uint8_t>(), p, getSize());
825 * Copy data into the packet from the provided block pointer,
826 * which is aligned to the given block size.
829 setDataFromBlock(uint8_t *blk_data, int blkSize)
831 setData(blk_data + getOffset(blkSize));
835 * Copy data from the packet to the provided block pointer, which
836 * is aligned to the given block size.
839 writeData(uint8_t *p)
841 std::memcpy(p, getPtr<uint8_t>(), getSize());
845 * Copy data from the packet to the memory at the provided pointer.
848 writeDataToBlock(uint8_t *blk_data, int blkSize)
850 writeData(blk_data + getOffset(blkSize));
854 * delete the data pointed to in the data pointer. Ok to call to
855 * matter how data was allocted.
860 if (flags.isSet(ARRAY_DATA))
862 else if (flags.isSet(DYNAMIC_DATA))
865 flags.clear(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA);
869 /** If there isn't data in the packet, allocate some. */
874 assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA));
878 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA));
879 flags.set(DYNAMIC_DATA|ARRAY_DATA);
880 data = new uint8_t[getSize()];
884 * Check a functional request against a memory value represented
885 * by a base/size pair and an associated data array. If the
886 * functional request is a read, it may be satisfied by the memory
887 * value. If the functional request is a write, it may update the
890 bool checkFunctional(Printable *obj, Addr base, int size, uint8_t *data);
893 * Check a functional request against a memory value stored in
894 * another packet (i.e. an in-transit request or response).
897 checkFunctional(PacketPtr other)
899 uint8_t *data = other->hasData() ? other->getPtr<uint8_t>() : NULL;
900 return checkFunctional(other, other->getAddr(), other->getSize(),
905 * Push label for PrintReq (safe to call unconditionally).
908 pushLabel(const std::string &lbl)
911 safe_cast<PrintReqState*>(senderState)->pushLabel(lbl);
915 * Pop label for PrintReq (safe to call unconditionally).
921 safe_cast<PrintReqState*>(senderState)->popLabel();
924 void print(std::ostream &o, int verbosity = 0,
925 const std::string &prefix = "") const;
928 #endif //__MEM_PACKET_HH