riscv/rocket-chip
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Make RoCC energy-saving logic mirror same for D$

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This commit is contained in:
Andrew Waterman 2016-06-28 12:10:33 -07:00
parent 6f85056494
commit a70dee17ea
1 changed files with 4 additions and 7 deletions
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11
rocket/src/main/scala/rocket.scala
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@ -180,7 +180,6 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
val wb_reg_mem_xcpt = Reg(Bool())
val wb_reg_replay = Reg(Bool())
val wb_reg_cause = Reg(UInt())
val wb_reg_rocc_pending = Reg(init=Bool(false))
val wb_reg_pc = Reg(UInt())
val wb_reg_inst = Reg(Bits())
val wb_reg_wdata = Reg(Bits())
@ -419,14 +418,10 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
val wb_set_sboard = wb_ctrl.div || wb_dcache_miss || wb_ctrl.rocc
val replay_wb_common = io.dmem.s2_nack || wb_reg_replay
val wb_rocc_val = wb_reg_valid && wb_ctrl.rocc && !replay_wb_common
val replay_wb = replay_wb_common || wb_reg_valid && wb_ctrl.rocc && !io.rocc.cmd.ready
val wb_xcpt = wb_reg_xcpt || csr.io.csr_xcpt
take_pc_wb := replay_wb || wb_xcpt || csr.io.eret
when (wb_rocc_val) { wb_reg_rocc_pending := !io.rocc.cmd.ready }
when (wb_reg_xcpt) { wb_reg_rocc_pending := Bool(false) }
// writeback arbitration
val dmem_resp_xpu = !io.dmem.resp.bits.tag(0).toBool
val dmem_resp_fpu = io.dmem.resp.bits.tag(0).toBool
@ -529,12 +524,14 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
val dcache_blocked = Reg(Bool())
dcache_blocked := !io.dmem.req.ready && (io.dmem.req.valid || dcache_blocked)
val rocc_blocked = Reg(Bool())
rocc_blocked := !wb_reg_xcpt && !io.rocc.cmd.ready && (io.rocc.cmd.valid || rocc_blocked)
val ctrl_stalld =
id_ex_hazard || id_mem_hazard || id_wb_hazard || id_sboard_hazard ||
id_ctrl.fp && id_stall_fpu ||
id_ctrl.mem && dcache_blocked || // reduce activity during D$ misses
Bool(usingRoCC) && wb_reg_rocc_pending && id_ctrl.rocc && !io.rocc.cmd.ready ||
id_ctrl.rocc && rocc_blocked || // reduce activity while RoCC is busy
id_do_fence ||
csr.io.csr_stall
ctrl_killd := !io.imem.resp.valid || take_pc || ctrl_stalld || csr.io.interrupt
@ -591,7 +588,7 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
io.dmem.s1_data := Mux(mem_ctrl.fp, io.fpu.store_data, mem_reg_rs2)
io.dmem.invalidate_lr := wb_xcpt
io.rocc.cmd.valid := wb_rocc_val
io.rocc.cmd.valid := wb_reg_valid && wb_ctrl.rocc && !replay_wb_common
io.rocc.exception := wb_xcpt && csr.io.status.xs.orR
io.rocc.status := csr.io.status
io.rocc.cmd.bits.inst := new RoCCInstruction().fromBits(wb_reg_inst)