riscv/rocket-chip
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Fixed abort bug: removed uneeded state, added mshr guard on xact_abort.valid and xact_init.ready on same cycle

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This commit is contained in:
Henry Cook 2012-04-24 15:11:59 -07:00
parent 37eb1a4ae6
commit 00155f4bc4
1 changed files with 5 additions and 7 deletions
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12
uncore/uncore.scala
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@ -408,7 +408,7 @@ class CoherenceHubBroadcast(ntiles: Int, co: CoherencePolicy) extends CoherenceH
}
// Nack conflicting transaction init attempts
val s_idle :: s_abort_drain :: s_abort_send :: s_abort_complete :: Nil = Enum(4){ UFix() }
val s_idle :: s_abort_drain :: s_abort_send :: Nil = Enum(3){ UFix() }
val abort_state_arr = Vec(ntiles) { Reg(resetVal = s_idle) }
val want_to_abort_arr = Vec(ntiles) { Wire() { Bool()} }
for( j <- 0 until ntiles ) {
@ -445,15 +445,12 @@ class CoherenceHubBroadcast(ntiles: Int, co: CoherencePolicy) extends CoherenceH
}
is(s_abort_send) { // nothing is dequeued for now
x_abort.valid := Bool(true)
when(x_abort.ready) {
abort_state_arr(j) := s_abort_complete
}
}
is(s_abort_complete) { // raises x_init.ready below
when(x_abort.ready) { // raises x_init.ready below
abort_state_arr(j) := s_idle
}
}
}
}
// Handle transaction initiation requests
// Only one allocation per cycle
@ -475,6 +472,7 @@ class CoherenceHubBroadcast(ntiles: Int, co: CoherencePolicy) extends CoherenceH
val x_init = io.tiles(j).xact_init
val x_init_data = io.tiles(j).xact_init_data
val x_init_data_dep = x_init_data_dep_list(j).io.deq
val x_abort = io.tiles(j).xact_abort
init_arb.io.in(j).valid := (abort_state_arr(j) === s_idle) && !want_to_abort_arr(j) && x_init.valid
init_arb.io.in(j).bits.xact_init := x_init.bits
init_arb.io.in(j).bits.tile_id := UFix(j)
@ -482,7 +480,7 @@ class CoherenceHubBroadcast(ntiles: Int, co: CoherencePolicy) extends CoherenceH
val do_pop = foldR(pop_x_inits)(_||_)
x_init_data_dep_list(j).io.enq.valid := do_pop && co.messageHasData(x_init.bits) && (abort_state_arr(j) === s_idle)
x_init_data_dep_list(j).io.enq.bits.global_xact_id := OHToUFix(pop_x_inits)
x_init.ready := (abort_state_arr(j) === s_abort_complete) || do_pop
x_init.ready := (x_abort.valid && x_abort.ready) || do_pop
x_init_data.ready := (abort_state_arr(j) === s_abort_drain) || foldR(trackerList.map(_.io.pop_x_init_data(j).toBool))(_||_)
x_init_data_dep.ready := foldR(trackerList.map(_.io.pop_x_init_dep(j).toBool))(_||_)
}