2 * Copyright (c) 2007 MIPS Technologies, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * Authors: Korey Sewell
32 #ifndef __CPU_INORDER_RESOURCE_HH__
33 #define __CPU_INORDER_RESOURCE_HH__
39 #include "cpu/inst_seq.hh"
40 #include "cpu/inorder/inorder_dyn_inst.hh"
41 #include "cpu/inorder/pipeline_traits.hh"
42 #include "sim/eventq.hh"
43 #include "sim/sim_object.hh"
48 class ResourceRequest;
50 typedef ResourceRequest ResReq;
51 typedef ResourceRequest* ResReqPtr;
55 typedef ThePipeline::DynInstPtr DynInstPtr;
57 friend class ResourceEvent;
58 friend class ResourceRequest;
61 Resource(std::string res_name, int res_id, int res_width,
62 int res_latency, InOrderCPU *_cpu);
63 virtual ~Resource() {}
65 /** Return name of this resource */
66 virtual std::string name();
68 /** Define this function if resource, has a port to connect to an outside
71 virtual Port* getPort(const std::string &if_name, int idx) { return NULL; }
73 /** Return ID for this resource */
74 int getId() { return id; }
76 /** Any extra initiliazation stuff can be set up using this function that
77 * should get called before the simulation starts (tick 0)
80 virtual void initSlots();
82 /** Register Stats for this resource */
83 virtual void regStats();
85 /** Resources that care about thread activation override this. */
86 virtual void activateThread(unsigned tid) { }
88 /** Deactivate Thread. Default action is to squash all instructions
89 * from deactivated thread.
91 virtual void deactivateThread(unsigned tid);
93 /** Resources that care when an instruction has been graduated
96 virtual void instGraduated(InstSeqNum seq_num,unsigned tid) { }
98 /** Request usage of this resource. Returns a ResourceRequest object
99 * with all the necessary resource information
101 virtual ResourceRequest* request(DynInstPtr inst);
103 /** Get the next available slot in this resource. Instruction is passed
104 * so that resources can check the instruction before allocating a slot
107 virtual int getSlot(DynInstPtr inst);
109 /** Find the slot that this instruction is using in a resource */
110 virtual int findSlot(DynInstPtr inst);
112 /** Free a resource slot */
113 virtual void freeSlot(int slot_idx);
115 /** Request usage of a resource for this instruction. If this instruction already
116 * has made this request to this resource, and that request is uncompleted
117 * this function will just return that request
119 virtual ResourceRequest* getRequest(DynInstPtr _inst, int stage_num,
120 int res_idx, int slot_num,
123 /** Schedule Execution of This Resource For A Given Slot*/
124 virtual void scheduleExecution(int slot_idx);
126 /** Execute the function of this resource. The Default is action
127 * is to do nothing. More specific models will derive from this
128 * class and define their own execute function.
130 virtual void execute(int slot_idx);
132 /** Fetch on behalf of an instruction. Will check to see
133 * if instruction is actually in resource before
134 * trying to fetch. Needs to be defined for derived units.
136 virtual Fault doFetchAccess(DynInstPtr inst)
137 { panic("doFetchAccess undefined for %s", name()); return NoFault; }
139 /** Read/Write on behalf of an instruction. Will check to see
140 * if instruction is actually in resource before
141 * trying to do access.Needs to be defined for derived units.
143 virtual Fault doCacheAccess(DynInstPtr inst, uint64_t *res=NULL)
144 { panic("doCacheAccess undefined for %s", name()); return NoFault; }
146 virtual void prefetch(DynInstPtr inst)
147 { panic("prefetch undefined for %s", name()); }
149 virtual void writeHint(DynInstPtr inst)
150 { panic("writeHint undefined for %s", name()); }
152 /** Squash All Requests After This Seq Num */
153 virtual void squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num, unsigned tid);
155 /** The number of instructions available that this resource can
160 /** The number of instructions using this resource */
163 /** Schedule resource event, regardless of its current state. */
164 void scheduleEvent(int slot_idx, int delay);
166 /** Find instruction in list, Schedule resource event, regardless of its current state. */
167 bool scheduleEvent(DynInstPtr inst, int delay);
169 /** Unschedule resource event, regardless of its current state. */
170 void unscheduleEvent(int slot_idx);
172 /** Unschedule resource event, regardless of its current state. */
173 bool unscheduleEvent(DynInstPtr inst);
175 /** Return the number of cycles in 'Tick' format */
176 Tick ticks(int numCycles);
178 /** Find the request that corresponds to this instruction */
179 virtual ResReqPtr findRequest(DynInstPtr inst);
182 virtual void rejectRequest(DynInstPtr inst);
184 /** Request a Resource again. Some resources have to special process this
185 * in subsequent accesses.
187 virtual void requestAgain(DynInstPtr inst, bool &try_request);
189 /** Return Latency of Resource */
190 /* Can be overridden for complex cases */
191 virtual int getLatency(int slot_num) { return latency; }
194 /** The name of this resource */
197 /** ID of the resource. The Resource Pool uses this # to identify this
202 /** The number of instructions the resource can simultaneously
207 /** Constant latency for this resource.
208 * Note: Dynamic latency resources set this to 0 and
209 * manage the latency themselves
214 /** Mapping of slot-numbers to the resource-request pointers */
215 std::map<int, ResReqPtr> reqMap;
217 /** A list of all the available execution slots for this resource.
218 * This correlates with the actual resource event idx.
220 std::vector<int> availSlots;
222 /** The CPU(s) that this resource interacts with */
226 /** The resource event used for scheduling resource slots on the
229 ResourceEvent *resourceEvent;
231 /** Default denied resource request pointer*/
235 /////////////////////////////////////////////////////////////////
237 // DEFAULT RESOURCE STATISTICS
239 /////////////////////////////////////////////////////////////////
240 /** Number of Instruction Requests the Resource Processes */
241 Stats::Scalar instReqsProcessed;
244 class ResourceEvent : public Event
247 /** Pointer to the CPU. */
251 /// Resource events that come before other associated CPU events
252 /// (for InOrderCPU model).
253 /// check src/sim/eventq.hh for more event priorities.
254 enum InOrderPriority {
255 Resource_Event_Pri = 45,
258 /** The Resource Slot that this event is servicing */
261 /** Constructs a resource event. */
263 ResourceEvent(Resource *res, int slot_idx);
264 virtual ~ResourceEvent() { }
266 /** Initialize data for this resource event. */
267 virtual void init(Resource *res, int slot_idx);
269 /** Processes a resource event. */
270 virtual void process();
272 /** Returns the description of the resource event. */
273 const char *description();
275 /** Set slot idx for event */
276 void setSlot(int slot) { slotIdx = slot; }
278 /** Schedule resource event, regardless of its current state. */
279 void scheduleEvent(int delay)
282 mainEventQueue.reschedule(this, curTick + resource->ticks(delay));
283 else if (!scheduled())
284 mainEventQueue.schedule(this, curTick + resource->ticks(delay));
287 /** Unschedule resource event, regardless of its current state. */
288 void unscheduleEvent()
296 class ResourceRequest
299 typedef ThePipeline::DynInstPtr DynInstPtr;
303 static int resReqCount;
306 ResourceRequest(Resource *_res, DynInstPtr _inst, int stage_num,
307 int res_idx, int slot_num, unsigned _cmd)
308 : res(_res), inst(_inst), cmd(_cmd), stageNum(stage_num),
309 resIdx(res_idx), slotNum(slot_num), completed(false),
310 squashed(false), processing(false), waiting(false)
314 DPRINTF(ResReqCount, "Res. Req %i created. resReqCount=%i.\n", reqID, resReqCount);
316 if (resReqCount > 100) {
317 fatal("Too many undeleted resource requests. Memory leak?\n");
321 virtual ~ResourceRequest()
324 DPRINTF(ResReqCount, "Res. Req %i deleted. resReqCount=%i.\n", reqID, resReqCount);
329 /** Acknowledge that this is a request is done and remove
332 void done(bool completed = true);
334 /////////////////////////////////////////////
336 // GET RESOURCE REQUEST IDENTIFICATION / INFO
338 /////////////////////////////////////////////
339 /** Get Resource Index */
340 int getResIdx() { return resIdx; }
342 /** Get Slot Number */
343 int getSlot() { return slotNum; }
345 /** Get Stage Number */
346 int getStageNum() { return stageNum; }
348 /** Set/Get Thread Ids */
349 void setTid(unsigned _tid) { tid = _tid; }
350 int getTid() { return tid; }
352 /** Instruction this request is for */
353 DynInstPtr getInst() { return inst; }
355 /** Data from this request. Overridden by Resource-Specific Request
358 virtual PacketDataPtr getData() { return NULL; }
360 /** Pointer to Resource that is being used */
363 /** Instruction being used */
366 /** Fault Associated With This Resource Request */
369 /** Command For This Resource */
372 ////////////////////////////////////////
374 // GET RESOURCE REQUEST STATUS FROM VARIABLES
376 ////////////////////////////////////////
377 /** Get/Set Completed variables */
378 bool isCompleted() { return completed; }
379 void setCompleted(bool cond = true) { completed = cond; }
381 /** Get/Set Squashed variables */
382 bool isSquashed() { return squashed; }
383 void setSquashed() { squashed = true; }
385 /** Get/Set IsProcessing variables */
386 bool isProcessing() { return processing; }
387 void setProcessing() { processing = true; }
389 /** Get/Set IsWaiting variables */
390 bool isWaiting() { return waiting; }
391 void setWaiting() { waiting = true; }
394 /** Resource Identification */
400 /** Resource Status */
407 #endif //__CPU_INORDER_RESOURCE_HH__