[tilelink2] Fuzzer: Allow noise-making to be parameterized. Better comments.
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@ -50,15 +50,39 @@ object LFSR64
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}
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}
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object NoiseMaker
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trait HasNoiseMakerIO
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{
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def apply(wide: Int, increment: Bool = Bool(true)): UInt = {
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val lfsrs = Seq.fill((wide+63)/64) { LFSR64(increment) }
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Cat(lfsrs)(wide-1,0)
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val io = new Bundle {
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val inc = Bool(INPUT)
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val random = UInt(OUTPUT)
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}
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}
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class TLFuzzer(nOperations: Int, inFlight: Int = 32) extends LazyModule
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class LFSRNoiseMaker(wide: Int) extends Module with HasNoiseMakerIO
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{
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val lfsrs = Seq.fill((wide+63)/64) { LFSR64(io.inc) }
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io.random := Cat(lfsrs)(wide-1,0)
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}
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object LFSRNoiseMaker {
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def apply(wide: Int, increment: Bool = Bool(true)): UInt = {
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val nm = Module(new LFSRNoiseMaker(wide))
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nm.io.inc := increment
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nm.io.random
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}
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}
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/** TLFuzzer drives test traffic over TL2 links. It generates a sequence of randomized
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* requests, and issues legal ones into the DUT. TODO: Currently the fuzzer only generates
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* memory operations, not permissions transfers.
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* @param nOperations is the total number of operations that the fuzzer must complete for the test to pass
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* @param inFlight is the number of operations that can be in-flight to the DUT concurrently
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* @param noiseMaker is a function that supplies a random UInt of a given width every time inc is true
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*/
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class TLFuzzer(
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nOperations: Int,
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inFlight: Int = 32,
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noiseMaker: (Int, Bool) => UInt = LFSRNoiseMaker.apply _) extends LazyModule
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{
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val node = TLClientNode(TLClientParameters(sourceId = IdRange(0,inFlight)))
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@ -70,6 +94,8 @@ class TLFuzzer(nOperations: Int, inFlight: Int = 32) extends LazyModule
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val out = io.out(0)
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val edge = node.edgesOut(0)
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// Extract useful parameters from the TL edge
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val endAddress = edge.manager.maxAddress + 1
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val maxTransfer = edge.manager.maxTransfer
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val beatBytes = edge.manager.beatBytes
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@ -111,14 +137,15 @@ class TLFuzzer(nOperations: Int, inFlight: Int = 32) extends LazyModule
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// Increment random number generation for the following subfields
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val inc = Wire(Bool())
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val inc_beat = Wire(Bool())
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val arth_op = NoiseMaker(3, inc)
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val log_op = NoiseMaker(2, inc)
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val amo_size = UInt(2) + NoiseMaker(1, inc) // word or dword
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val size = NoiseMaker(sizeBits, inc)
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val addr = NoiseMaker(addressBits, inc) & ~UIntToOH1(size, addressBits)
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val mask = NoiseMaker(beatBytes, inc_beat) & edge.mask(addr, size)
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val data = NoiseMaker(dataBits, inc_beat)
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val arth_op = noiseMaker(3, inc)
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val log_op = noiseMaker(2, inc)
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val amo_size = UInt(2) + noiseMaker(1, inc) // word or dword
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val size = noiseMaker(sizeBits, inc)
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val addr = noiseMaker(addressBits, inc) & ~UIntToOH1(size, addressBits)
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val mask = noiseMaker(beatBytes, inc_beat) & edge.mask(addr, size)
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val data = noiseMaker(dataBits, inc_beat)
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// Actually generate specific TL messages when it is legal to do so
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val (glegal, gbits) = edge.Get(src, addr, size)
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val (pflegal, pfbits) = if(edge.manager.anySupportPutFull) {
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edge.Put(src, addr, size, data)
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@ -136,7 +163,8 @@ class TLFuzzer(nOperations: Int, inFlight: Int = 32) extends LazyModule
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edge.Hint(src, addr, size, UInt(0))
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} else { (glegal, gbits) }
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val a_type_sel = NoiseMaker(3, inc)
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// Pick a specific message to try to send
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val a_type_sel = noiseMaker(3, inc)
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val legal = MuxLookup(a_type_sel, glegal, Seq(
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UInt("b000") -> glegal,
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@ -154,6 +182,7 @@ class TLFuzzer(nOperations: Int, inFlight: Int = 32) extends LazyModule
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UInt("b100") -> lbits,
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UInt("b101") -> hbits))
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// Wire both the used and un-used channel signals
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out.a.valid := legal && alloc.valid && num_reqs =/= UInt(0)
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out.a.bits := bits
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out.b.ready := Bool(true)
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@ -161,6 +190,7 @@ class TLFuzzer(nOperations: Int, inFlight: Int = 32) extends LazyModule
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out.d.ready := Bool(true)
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out.e.valid := Bool(false)
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// Increment the various progress-tracking states
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inc := !legal || req_done
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inc_beat := !legal || out.a.fire()
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