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tilelink: split Acquire into Acquire{Block,Perm} (#1030)

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We had planned for a while to add an 'Overwrite' message which obtains
permissions without requiring retrieval of data. This is useful whenever
a master knows it will completely replace the contents of a cache block.

Instead of calling it Overwrite, we decided to split the Acquire type.

If you AcquirePerm, you MUST Release and ProbeAck with Data.
This commit is contained in:
Wesley W. Terpstra
2017-10-05 12:49:49 -07:00
committed by GitHub
parent 81b9ac42a3
commit bd045a3b95
9 changed files with 55 additions and 25 deletions
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5
src/main/scala/tilelink/CacheCork.scala
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@ -47,7 +47,8 @@ class TLCacheCork(unsafe: Boolean = false)(implicit p: Parameters) extends LazyM
val a_a = Wire(out.a)
val a_d = Wire(in.d)
val isPut = in.a.bits.opcode === PutFullData || in.a.bits.opcode === PutPartialData
val toD = in.a.bits.opcode === Acquire && in.a.bits.param === TLPermissions.BtoT
val toD = (in.a.bits.opcode === AcquireBlock && in.a.bits.param === TLPermissions.BtoT) ||
(in.a.bits.opcode === AcquirePerm)
in.a.ready := Mux(toD, a_d.ready, a_a.ready)
a_a.valid := in.a.valid && !toD
@ -55,7 +56,7 @@ class TLCacheCork(unsafe: Boolean = false)(implicit p: Parameters) extends LazyM
a_a.bits.source := in.a.bits.source << 1 | Mux(isPut, UInt(1), UInt(0))
// Transform Acquire into Get
when (in.a.bits.opcode === Acquire) {
when (in.a.bits.opcode === AcquireBlock || in.a.bits.opcode === AcquirePerm) {
a_a.bits.opcode := Get
a_a.bits.param := UInt(0)
a_a.bits.source := in.a.bits.source << 1 | UInt(1)