riscv/rocket-chip
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hellacache now works

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This commit is contained in:
Andrew Waterman 2011-12-17 03:26:11 -08:00
parent 56c4f44c2a
commit a8d0cd95e6
8 changed files with 174 additions and 195 deletions
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4
rocket/src/main/scala/consts.scala
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@ -126,7 +126,7 @@ object Constants
val M_PFR = Bits("b0010", 4); // prefetch with intent to read
val M_PFW = Bits("b0011", 4); // prefetch with intent to write
val M_FLA = Bits("b0100", 4); // write back and invlaidate all lines
val M_PRD = Bits("b0101", 4); // PTW load
val M_FENCE = Bits("b0101", 4); // memory fence
val M_INV = Bits("b0110", 4); // write back and invalidate line
val M_CLN = Bits("b0111", 4); // write back line
val M_XA_ADD = Bits("b1000", 4);
@ -191,7 +191,7 @@ object Constants
val OFFSET_BITS = 6; // log2(cache line size in bytes)
val NMSHR = 2; // number of primary misses
val NRPQ = 16; // number of secondary misses
val NSDQ = 10; // number of secondary stores/AMOs
val NSDQ = 17; // number of secondary stores/AMOs
val LG_REFILL_WIDTH = 4; // log2(cache bus width in bytes)
val IDX_BITS = PGIDX_BITS - OFFSET_BITS;

17
rocket/src/main/scala/ctrl.scala
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@ -253,8 +253,8 @@ class rocketCtrl extends Component
EI-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_EI,SYNC_N,N,N,Y),
DI-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_DI,SYNC_N,N,N,Y),
ERET-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_PCR,REN_N,WEN_N,I_X ,SYNC_N,Y,N,Y),
FENCE-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_D,N,N,N),
FENCE_I-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_I,N,N,N),
FENCE-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_Y,M_FENCE, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_D,N,N,N),
FENCE_I-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_Y,M_FLA, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_I,N,N,N),
CFLUSH-> List(Y, BR_N, REN_Y,REN_N,A2_X, A1_X, DW_X, FN_X, M_Y,M_FLA, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,Y),
MFPCR-> List(Y, BR_N, REN_N,REN_N,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_RD,WB_PCR,REN_Y,WEN_N,I_X ,SYNC_N,N,N,Y),
MTPCR-> List(Y, BR_N, REN_N,REN_Y,A2_X, A1_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_Y,I_X ,SYNC_N,N,N,Y),
@ -495,10 +495,13 @@ class rocketCtrl extends Component
Mux(p_irq_timer, UFix(23,5),
UFix(0,5)));
val mem_xcpt_ma_ld = io.xcpt_ma_ld && !mem_reg_kill_dmem
val mem_xcpt_ma_st = io.xcpt_ma_st && !mem_reg_kill_dmem
val mem_exception =
interrupt ||
io.xcpt_ma_ld ||
io.xcpt_ma_st ||
mem_xcpt_ma_ld ||
mem_xcpt_ma_st ||
io.xcpt_dtlb_ld ||
io.xcpt_dtlb_st ||
mem_reg_xcpt_illegal ||
@ -516,8 +519,8 @@ class rocketCtrl extends Component
Mux(mem_reg_xcpt_fpu, UFix(4,5), // FPU disabled
Mux(mem_reg_xcpt_syscall, UFix(6,5), // system call
// breakpoint
Mux(io.xcpt_ma_ld, UFix(8,5), // misaligned load
Mux(io.xcpt_ma_st, UFix(9,5), // misaligned store
Mux(mem_xcpt_ma_ld, UFix(8,5), // misaligned load
Mux(mem_xcpt_ma_st, UFix(9,5), // misaligned store
Mux(io.xcpt_dtlb_ld, UFix(10,5), // load fault
Mux(io.xcpt_dtlb_st, UFix(11,5), // store fault
UFix(0,5))))))))))); // instruction address misaligned
@ -622,7 +625,7 @@ class rocketCtrl extends Component
(id_sel_wa === WA_RD) && id_stall_waddr ||
(id_sel_wa === WA_RA) && id_stall_ra ||
id_mem_val.toBool && !(io.dmem.req_rdy && io.dtlb_rdy) ||
(id_sync === SYNC_D) && !io.dmem.req_rdy ||
((id_sync === SYNC_D) || (id_sync === SYNC_I)) && !io.dmem.req_rdy ||
id_console_out_val && !io.console.rdy ||
id_div_val.toBool && !io.dpath.div_rdy ||
io.dpath.div_result_val ||

5
rocket/src/main/scala/dcache.scala
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@ -205,13 +205,12 @@ class rocketDCacheDM(lines: Int) extends Component {
val p_store_valid = Reg(resetVal = Bool(false));
val req_store = (io.cpu.req_cmd === M_XWR);
val req_load = (io.cpu.req_cmd === M_XRD) || (io.cpu.req_cmd === M_PRD);
val req_load = (io.cpu.req_cmd === M_XRD);
val req_flush = (io.cpu.req_cmd === M_FLA);
val req_amo = io.cpu.req_cmd(3).toBool;
val r_req_load = (r_cpu_req_cmd === M_XRD) || (r_cpu_req_cmd === M_PRD);
val r_req_load = (r_cpu_req_cmd === M_XRD);
val r_req_store = (r_cpu_req_cmd === M_XWR);
val r_req_flush = (r_cpu_req_cmd === M_FLA);
val r_req_ptw_load = (r_cpu_req_cmd === M_PRD);
val r_req_amo = r_cpu_req_cmd(3).toBool;
when (io.cpu.req_val && io.cpu.req_rdy) {

7
rocket/src/main/scala/dtlb.scala
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@ -62,8 +62,7 @@ class rocketDTLB(entries: Int) extends Component
val req_load = (r_cpu_req_cmd === M_XRD);
val req_store = (r_cpu_req_cmd === M_XWR);
val req_flush = (r_cpu_req_cmd === M_FLA);
val req_amo = io.cpu.req_cmd(3).toBool;
val req_amo = r_cpu_req_cmd(3).toBool;
val lookup_tag = Cat(r_cpu_req_asid, r_cpu_req_vpn);
@ -118,7 +117,7 @@ class rocketDTLB(entries: Int) extends Component
val repl_waddr = Mux(invalid_entry, ie_addr, repl_count).toUFix;
val lookup = (state === s_ready) && r_cpu_req_val && !req_flush;
val lookup = (state === s_ready) && r_cpu_req_val && (req_load || req_store || req_amo);
val lookup_hit = lookup && tag_hit;
val lookup_miss = lookup && !tag_hit;
val tlb_hit = status_vm && lookup_hit;
@ -143,7 +142,6 @@ class rocketDTLB(entries: Int) extends Component
(status_u && !ur_array(tag_hit_addr).toBool));
io.cpu.xcpt_ld := access_fault_ld;
// (lookup && (req_load || req_amo) && outofrange) || access_fault_ld;
val access_fault_st =
tlb_hit && (req_store || req_amo) &&
@ -151,7 +149,6 @@ class rocketDTLB(entries: Int) extends Component
(status_u && !uw_array(tag_hit_addr).toBool));
io.cpu.xcpt_st := access_fault_st;
// (lookup && (req_store || req_amo) && outofrange) || access_fault_st;
io.cpu.req_rdy := (state === s_ready) && !tlb_miss;
io.cpu.resp_miss := tlb_miss;

5
rocket/src/main/scala/icache.scala
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@ -113,10 +113,7 @@ class rocketICacheDM(lines: Int) extends Component {
// output signals
io.cpu.resp_val := !io.cpu.itlb_miss && (state === s_ready) && r_cpu_req_val && tag_valid && tag_match;
io.cpu.req_rdy := !io.cpu.itlb_miss && (state === s_ready) && (!r_cpu_req_val || (tag_valid && tag_match));
val test = Wire { Bits(width = MEM_DATA_BITS) }
test <== data_array_rdata
io.cpu.resp_data := Slice(MEM_DATA_BITS/databits, test, r_cpu_req_idx(offsetmsb-rf_cnt_bits,offsetlsb))
io.cpu.resp_data := data_array_rdata >> Cat(r_cpu_req_idx(offsetmsb-rf_cnt_bits,offsetlsb), UFix(0, log2up(databits))).toUFix
io.mem.req_val := (state === s_request);
io.mem.req_addr := Cat(r_cpu_req_ppn, r_cpu_req_idx(indexmsb,indexlsb)).toUFix

314
rocket/src/main/scala/nbdcache.scala
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@ -42,16 +42,18 @@ class StoreDataGen extends Component {
io.dout := data
}
// this currently requires that CPU_DATA_BITS == 64
class LoadDataGen extends Component {
val io = new Bundle {
val typ = Bits(3, 'input)
val addr = Bits(3, 'input)
val din = Bits(64, 'input)
val addr = Bits(log2up(MEM_DATA_BITS/8), 'input)
val din = Bits(MEM_DATA_BITS, 'input)
val dout = Bits(64, 'output)
val dout_subword = Bits(64, 'output)
val r_dout = Bits(64, 'output)
val r_dout_subword = Bits(64, 'output)
}
val shifted = io.din >> Cat(io.addr(2), Bits(0, 5)).toUFix
val shifted = io.din >> Cat(io.addr(io.addr.width-1,2), Bits(0, 5)).toUFix
val extended = Wire { Bits(width = io.din.width) }
switch (io.typ)
{
@ -60,7 +62,8 @@ class LoadDataGen extends Component {
otherwise { extended <== shifted }
}
val shifted_subword = Reg(extended) >> Cat(Reg(io.addr(1,0)), Bits(0, 3)).toUFix
val r_extended = Reg(extended)
val shifted_subword = r_extended >> Cat(Reg(io.addr(1,0)), Bits(0, 3)).toUFix
val extended_subword = Wire { Bits(width = io.din.width) }
switch (Reg(io.typ))
{
@ -72,7 +75,8 @@ class LoadDataGen extends Component {
}
io.dout := extended
io.dout_subword := extended_subword
io.r_dout := r_extended
io.r_dout_subword := extended_subword
}
class RPQEntry extends Bundle {
@ -80,7 +84,7 @@ class RPQEntry extends Bundle {
val cmd = Bits(width = 4)
val typ = Bits(width = 3)
val sdq_id = UFix(width = log2up(NSDQ))
val tag = Bits(width = CPU_TAG_BITS)
val tag = Bits(width = DCACHE_TAG_BITS)
}
class Replay extends Bundle {
@ -89,12 +93,12 @@ class Replay extends Bundle {
val cmd = Bits(width = 4)
val typ = Bits(width = 3)
val sdq_id = UFix(width = log2up(NSDQ))
val tag = Bits(width = CPU_TAG_BITS)
val tag = Bits(width = DCACHE_TAG_BITS)
}
class DataReq extends Bundle {
val idx = Bits(width = IDX_BITS)
val offset = Bits(width = IDX_BITS)
val offset = Bits(width = OFFSET_BITS)
val cmd = Bits(width = 4)
val typ = Bits(width = 3)
val data = Bits(width = CPU_DATA_BITS)
@ -143,7 +147,7 @@ class MSHR(id: Int) extends Component {
val req_cmd = Bits(width = 4)
val req_type = Bits(width = 3)
val req_sdq_id = UFix(width = log2up(NSDQ))
val req_tag = Bits(CPU_TAG_BITS, 'input)
val req_tag = Bits(DCACHE_TAG_BITS, 'input)
val idx_match = Bool('output)
val idx = Bits(IDX_BITS, 'output)
@ -164,7 +168,7 @@ class MSHR(id: Int) extends Component {
val req_load = (io.req_cmd === M_XRD) || (io.req_cmd === M_PFR)
val req_use_rpq = (io.req_cmd != M_PFR) && (io.req_cmd != M_PFW)
val next_dirty = io.req_pri_val && io.req_pri_rdy && !req_load || io.req_sec_val && io.req_sec_rdy && (!req_load || dirty)
val next_dirty = dirty || io.req_sec_val && io.req_sec_rdy && !req_load
val sec_rdy = io.idx_match && !refilled && (dirty || !requested || req_load)
val rpq = (new queueSimplePF(NRPQ)) { new RPQEntry() }
@ -179,6 +183,7 @@ class MSHR(id: Int) extends Component {
when (io.req_pri_val && io.req_pri_rdy) {
valid <== Bool(true)
dirty <== !req_load
requested <== Bool(false)
refilled <== Bool(false)
ppn <== io.req_ppn
@ -233,13 +238,15 @@ class MSHRFile extends Component {
val req_cmd = Bits(4, 'input)
val req_type = Bits(3, 'input)
val req_data = Bits(CPU_DATA_BITS, 'input)
val req_tag = Bits(CPU_TAG_BITS, 'input)
val req_tag = Bits(DCACHE_TAG_BITS, 'input)
val req_sdq_id = UFix(log2up(NSDQ), 'input)
val mem_resp_val = Bool('input)
val mem_resp_tag = Bits(DMEM_TAG_BITS, 'input)
val mem_resp_idx = Bits(IDX_BITS, 'output)
val fence_rdy = Bool('output)
val mem_req = (new ioDecoupled) { new MemReq() }.flip()
val meta_req = (new ioDecoupled) { new MetaArrayReq() }.flip()
val replay = (new ioDecoupled) { new Replay() }.flip()
@ -247,6 +254,7 @@ class MSHRFile extends Component {
val idx_match = Wire { Bool() }
val pri_rdy = Wire { Bool() }
val fence = Wire { Bool() }
val sec_rdy = Wire { Bool() }
val tag_mux = new Mux1H(NMSHR, PPN_BITS)
@ -284,14 +292,16 @@ class MSHRFile extends Component {
val mem_resp_val = io.mem_resp_val && (UFix(i) === io.mem_resp_tag)
mshr.io.mem_resp_val := mem_resp_val
mem_resp_idx_mux.io.sel(i) := mem_resp_val
mem_resp_idx_mux.io.sel(i) := (UFix(i) === io.mem_resp_tag)
mem_resp_idx_mux.io.in(i) := mshr.io.idx
when (mshr.io.req_pri_rdy) { pri_rdy <== Bool(true) }
when (!mshr.io.req_pri_rdy) { fence <== Bool(true) }
when (mshr.io.req_sec_rdy) { sec_rdy <== Bool(true) }
when (mshr.io.idx_match) { idx_match <== Bool(true) }
}
pri_rdy <== Bool(false)
fence <== Bool(false)
sec_rdy <== Bool(false)
idx_match <== Bool(false)
@ -301,6 +311,7 @@ class MSHRFile extends Component {
io.req_rdy := Mux(idx_match, tag_match && sec_rdy, pri_rdy)
io.mem_resp_idx := mem_resp_idx_mux.io.out
io.fence_rdy := !fence
}
class ReplayUnit extends Component {
@ -310,7 +321,7 @@ class ReplayUnit extends Component {
val replay = (new ioDecoupled) { new Replay() }
val data_req = (new ioDecoupled) { new DataReq() }.flip()
val cpu_resp_val = Bool('output)
val cpu_resp_tag = Bits(CPU_TAG_BITS, 'output)
val cpu_resp_tag = Bits(DCACHE_TAG_BITS, 'output)
}
val sdq_val = Reg(resetVal = UFix(0, NSDQ))
@ -366,6 +377,7 @@ class WritebackUnit extends Component {
val req = (new ioDecoupled) { new WritebackReq() }
val data_req = (new ioDecoupled) { new DataArrayReq() }.flip()
val data_resp = Bits(MEM_DATA_BITS, 'input)
val refill_req = (new ioDecoupled) { new MemReq() }
val mem_req = (new ioDecoupled) { new MemReq() }.flip()
val mem_req_data = Bits(MEM_DATA_BITS, 'output)
}
@ -375,32 +387,39 @@ class WritebackUnit extends Component {
val cnt = Reg() { UFix(width = log2up(REFILL_CYCLES+1)) }
val addr = Reg() { new WritebackReq() }
// don't allow memory requests to bypass conflicting writebacks.
// TODO: turn this into a victim buffer.
val block_refill = valid && (io.refill_req.bits.addr(IDX_BITS-1,0) === addr.idx)
val refill_val = io.refill_req.valid && !block_refill
wbq.io.enq.valid := valid && Reg(io.data_req.valid && io.data_req.ready)
wbq.io.enq.bits := io.data_resp
wbq.io.deq.ready := io.mem_req.ready && (cnt === UFix(REFILL_CYCLES))
wbq.io.deq.ready := io.mem_req.ready && !refill_val && (cnt === UFix(REFILL_CYCLES))
when (io.req.valid && io.req.ready) { valid <== Bool(true); cnt <== UFix(0); addr <== io.req.bits }
when (io.data_req.valid && io.data_req.ready) { cnt <== cnt + UFix(1) }
when ((cnt === UFix(REFILL_CYCLES)) && !wbq.io.deq.valid) { valid <== Bool(false) }
io.req.ready := !valid
io.data_req.valid := valid && wbq.io.enq.ready
io.data_req.valid := valid && (cnt < UFix(REFILL_CYCLES))
io.data_req.bits.idx := addr.idx
io.data_req.bits.offset := cnt
io.data_req.bits.rw := Bool(false)
io.data_req.bits.wmask := Bits(0)
io.data_req.bits.data := Bits(0)
io.mem_req.valid := wbq.io.deq.valid && (cnt === UFix(REFILL_CYCLES))
io.mem_req.bits.rw := Bool(true)
io.mem_req.bits.addr := Cat(addr.ppn, addr.idx).toUFix
io.mem_req.bits.tag := Bits(0)
io.refill_req.ready := io.mem_req.ready && !block_refill
io.mem_req.valid := refill_val || wbq.io.deq.valid && (cnt === UFix(REFILL_CYCLES))
io.mem_req.bits.rw := !refill_val
io.mem_req.bits.addr := Mux(refill_val, io.refill_req.bits.addr, Cat(addr.ppn, addr.idx).toUFix)
io.mem_req.bits.tag := io.refill_req.bits.tag
io.mem_req_data := wbq.io.deq.bits
}
class FlushUnit(lines: Int) extends Component {
val io = new Bundle {
val req = (new ioDecoupled) { Bits(width = CPU_TAG_BITS) }
val resp = (new ioDecoupled) { Bits(width = CPU_TAG_BITS) }.flip()
val req = (new ioDecoupled) { Bits(width = DCACHE_TAG_BITS) }
val resp = (new ioDecoupled) { Bits(width = DCACHE_TAG_BITS) }.flip()
val meta_req = (new ioDecoupled) { new MetaArrayReq() }.flip()
val meta_resp = (new MetaData).asInput()
val wb_req = (new ioDecoupled) { new WritebackReq() }.flip()
@ -431,7 +450,8 @@ class FlushUnit(lines: Int) extends Component {
io.meta_req.bits.data.dirty := Bool(false)
io.meta_req.bits.data.tag := UFix(0)
io.wb_req.valid := state === s_meta_wait
io.meta_resp ^^ io.wb_req.bits
io.wb_req.bits.ppn := io.meta_resp.tag
io.wb_req.bits.idx := cnt
}
class MetaDataArray(lines: Int) extends Component {
@ -444,10 +464,10 @@ class MetaDataArray(lines: Int) extends Component {
val vd_array = Mem4(lines, Bits(width = 2))
vd_array.setReadLatency(0)
val vd_wdata2 = Cat(io.state_req.bits.data.valid, io.state_req.bits.data.dirty)
vd_array.write(io.state_req.bits.idx, vd_wdata2, io.state_req.valid && io.state_req.bits.rw)
val vd_wdata1 = Cat(io.req.bits.data.valid, io.req.bits.data.dirty)
val vd_rdata1 = vd_array.rw(io.req.bits.idx, vd_wdata1, io.req.valid && io.req.bits.rw)
val vd_wdata2 = Cat(io.state_req.bits.data.valid, io.req.bits.data.dirty)
vd_array.write(io.state_req.bits.idx, vd_wdata2, io.state_req.valid && io.state_req.bits.rw)
val tag_array = Mem4(lines, io.resp.tag)
tag_array.setReadLatency(0)
@ -477,31 +497,29 @@ class DataArray(lines: Int) extends Component {
io.req.ready := Bool(true)
}
class rocketNBDCacheAMOALU extends Component {
class AMOALU extends Component {
val io = new Bundle {
val cmd = Bits(4, 'input)
val wmask = Bits(64/8, 'input)
val lhs = UFix(64, 'input)
val rhs = UFix(64, 'input)
val result = UFix(64, 'output)
val cmd = Bits(4, 'input)
val typ = Bits(3, 'input)
val lhs = UFix(64, 'input)
val rhs = UFix(64, 'input)
val out = UFix(64, 'output)
}
val signed = (io.cmd === M_XA_MIN) || (io.cmd === M_XA_MAX)
val sub = (io.cmd === M_XA_MIN) || (io.cmd === M_XA_MINU) || (io.cmd === M_XA_MAX) || (io.cmd === M_XA_MAXU)
val min = (io.cmd === M_XA_MIN) || (io.cmd === M_XA_MINU)
val word = (io.typ === MT_W) || (io.typ === MT_WU)
val addsub_rhs = Mux(sub, ~io.rhs, io.rhs)
val adder_lhs = Cat(io.lhs(63,32), io.wmask(3) & io.lhs(31), io.lhs(30,0)).toUFix;
val adder_rhs = Cat(addsub_rhs(63,32), io.wmask(3) & addsub_rhs(31), addsub_rhs(30,0)).toUFix;
val adder_out = adder_lhs + adder_rhs + sub.toUFix
val adder_out = (Cat(io.lhs, UFix(0,1)).toUFix + Cat(io.rhs ^ Fill(io.rhs.width, sub), sub).toUFix) >> UFix(1)
val cmp_lhs = Mux(io.wmask(7), io.lhs(63), io.lhs(31))
val cmp_rhs = Mux(io.wmask(7), io.rhs(63), io.rhs(31))
val cmp_diff = Mux(io.wmask(7), adder_out(63), adder_out(31))
val cmp_lhs = Mux(word, io.lhs(31), io.lhs(63))
val cmp_rhs = Mux(word, io.rhs(31), io.rhs(63))
val cmp_diff = Mux(word, adder_out(31), adder_out(63))
val less = Mux(cmp_lhs === cmp_rhs, cmp_diff, Mux(signed, cmp_lhs, cmp_rhs))
val cmp_out = Mux(min === less, io.lhs, io.rhs)
val alu_out = Wire { UFix(width = io.result.width) };
val alu_out = Wire { UFix(width = io.out.width) };
switch (io.cmd) {
is (M_XA_ADD) { alu_out <== adder_out }
is (M_XA_SWAP) { alu_out <== io.rhs }
@ -510,54 +528,7 @@ class rocketNBDCacheAMOALU extends Component {
}
alu_out <== cmp_out
io.result := alu_out
}
// XXX broken for CPU_DATA_BITS != 64
class AMOUnit extends Component {
val io = new Bundle {
val req = (new ioDecoupled) { new DataReq() }
val lhs = Bits(width = CPU_DATA_BITS)
val rhs = Bits(width = CPU_DATA_BITS)
val wmask = Bits(width = CPU_DATA_BITS/8, dir = 'input)
val data_req = (new ioDecoupled) { new DataReq() }.flip()
}
val valid = Reg(resetVal = Bool(false))
val r_cmd = Reg() { Bits() }
val r_offset = Reg() { Bits() }
val r_type = Reg() { Bits() }
val r_idx = Reg() { Bits() }
val r_lhs = Reg() { Bits() }
val r_rhs = Reg() { Bits() }
val r_wmask = Reg() { Bits() }
when (io.req.valid && io.req.ready) {
valid <== Bool(true);
r_idx <== io.req.bits.idx
r_lhs <== io.lhs;
r_rhs <== io.rhs;
r_cmd <== io.req.bits.cmd;
r_type <== io.req.bits.typ;
r_offset <== io.req.bits.offset;
r_wmask <== io.wmask
}
when (io.data_req.valid && io.data_req.ready) {
valid <== Bool(false)
}
val alu = new rocketNBDCacheAMOALU
alu.io.cmd := r_cmd
alu.io.wmask := r_wmask
alu.io.lhs := r_lhs
alu.io.rhs := r_rhs
io.req.ready := !valid
io.data_req.valid := valid
io.data_req.bits.idx := r_idx
io.data_req.bits.cmd := r_cmd
io.data_req.bits.typ := r_type
io.data_req.bits.offset := r_offset
io.data_req.bits.data := alu.io.result
io.out := alu_out
}
class HellaCache(lines: Int) extends Component {
@ -576,7 +547,7 @@ class HellaCache(lines: Int) extends Component {
val ramindexlsb = log2up(MEM_DATA_BITS/8);
val early_nack = Reg { Bool() }
val r_cpu_req_val_ = Reg(io.cpu.req_val, resetVal = Bool(false))
val r_cpu_req_val_ = Reg(io.cpu.req_val && io.cpu.req_rdy, resetVal = Bool(false))
val r_cpu_req_val = r_cpu_req_val_ && !io.cpu.req_kill && !early_nack
val r_cpu_req_idx = Reg() { Bits() }
val r_cpu_req_cmd = Reg() { Bits() }
@ -584,45 +555,46 @@ class HellaCache(lines: Int) extends Component {
val r_cpu_req_tag = Reg() { Bits() }
val r_cpu_req_data = Reg() { Bits() }
val r2_cpu_req_val = Reg(r_cpu_req_val, resetVal = Bool(false))
val r2_cpu_req_ppn = Reg(io.cpu.req_ppn)
val r2_cpu_req_idx = Reg(r_cpu_req_idx)
val r2_cpu_req_cmd = Reg(r_cpu_req_cmd)
val r2_cpu_req_type = Reg(r_cpu_req_type)
val r2_cpu_req_tag = Reg(r_cpu_req_tag)
val p_store_valid = Reg(resetVal = Bool(false))
val p_store_data = Reg() { Bits() }
val p_store_idx = Reg() { Bits() }
val p_store_cmd = Reg() { Bits() }
val p_store_type = Reg() { Bits() }
val store_data_wide = Wire { Bits(width = MEM_DATA_BITS) }
val store_wmask_wide = Wire { Bits(width = MEM_DATA_BITS) }
val req_store = (io.cpu.req_cmd === M_XWR)
val req_load = (io.cpu.req_cmd === M_XRD) || (io.cpu.req_cmd === M_PRD)
val req_flush = (io.cpu.req_cmd === M_FLA)
val req_load = (io.cpu.req_cmd === M_XRD)
val req_amo = io.cpu.req_cmd(3).toBool
val req_read = req_load || req_amo
val req_write = req_store || req_amo
val r_req_load = (r_cpu_req_cmd === M_XRD)
val r_req_store = (r_cpu_req_cmd === M_XWR)
val r_req_flush = (r_cpu_req_cmd === M_FLA)
val r_req_fence = (r_cpu_req_cmd === M_FENCE)
val r_req_amo = r_cpu_req_cmd(3).toBool
val r_req_read = r_req_load || r_req_amo
val r_req_write = r_req_store || r_req_amo
val r2_req_load = (r2_cpu_req_cmd === M_XRD)
val r2_req_store = (r2_cpu_req_cmd === M_XWR)
val r2_req_amo = r2_cpu_req_cmd(3).toBool
val r2_req_write = r2_req_store || r2_req_amo
val r_req_readwrite = r_req_read || r_req_write
val nack_wb = Wire { Bool() }
val nack_mshr = Wire { Bool() }
val nack_sdq = Wire { Bool() }
// replay unit
val replayer = new ReplayUnit
val replay_amo_val = replayer.io.data_req.valid && replayer.io.data_req.bits.cmd(3).toBool
val replay_amo_rdy = replayer.io.data_req.ready
val replay_amo = replay_amo_val && replay_amo_rdy
val r_replay_amo = Reg(replay_amo, resetVal = Bool(false))
when (replay_amo) {
r_cpu_req_data <== replayer.io.data_req.bits.data
}
when (io.cpu.req_val) {
r_cpu_req_idx <== io.cpu.req_idx
r_cpu_req_cmd <== Mux(req_load, M_XRD, io.cpu.req_cmd)
r_cpu_req_cmd <== io.cpu.req_cmd
r_cpu_req_type <== io.cpu.req_type
r_cpu_req_tag <== io.cpu.req_tag
when (req_write) {
@ -642,19 +614,10 @@ class HellaCache(lines: Int) extends Component {
// writeback unit
val wb = new WritebackUnit
val mem_arb = (new Arbiter(2)) { new MemReq() }
val wb_arb = (new Arbiter(2)) { new WritebackReq() }
wb_arb.io.out <> wb.io.req
wb.io.data_req <> data_arb.io.in(1)
wb.io.data_req <> data_arb.io.in(3)
wb.io.data_resp <> data.io.resp
wb.io.mem_req <> mem_arb.io.in(0)
// reset and flush unit
val flusher = new FlushUnit(lines)
flusher.io.req.valid := r_cpu_req_val && r_req_flush
flusher.io.wb_req <> wb_arb.io.in(0)
flusher.io.meta_req <> meta_arb.io.in(0)
flusher.io.meta_resp <> meta.io.resp
// cpu tag check
meta_arb.io.in(2).valid := io.cpu.req_val
@ -667,6 +630,7 @@ class HellaCache(lines: Int) extends Component {
val tag_match = meta.io.resp.valid && (meta.io.resp.tag === io.cpu.req_ppn)
val tag_hit = r_cpu_req_val && tag_match
val tag_miss = r_cpu_req_val && !tag_match
val dirty = meta.io.resp.valid && meta.io.resp.dirty
// refill counter
val rr_count = Reg(resetVal = UFix(0, log2up(REFILL_CYCLES)))
@ -683,7 +647,7 @@ class HellaCache(lines: Int) extends Component {
// writeback
val wb_rdy = wb_arb.io.in(1).ready
wb_arb.io.in(1).valid := r_cpu_req_val && !tag_match && meta.io.resp.dirty
wb_arb.io.in(1).valid := tag_miss && r_req_readwrite && dirty && !nack_wb
wb_arb.io.in(1).bits.ppn := meta.io.resp.tag
wb_arb.io.in(1).bits.idx := r_cpu_req_idx(indexmsb,indexlsb)
@ -696,12 +660,12 @@ class HellaCache(lines: Int) extends Component {
data_arb.io.in(4).valid := io.cpu.req_val && req_read
val early_load_nack = req_read && !data_arb.io.in(4).ready
// store hits.
// store hits and AMO hits and misses use a pending store register.
// we nack new stores if a pending store can't retire for some reason.
// we drain a pending store if the CPU performs a store or a
// conflictig load, or if the cache is idle, or after a miss.
val p_store_match = r_cpu_req_val && r_req_read && p_store_valid && (r_cpu_req_idx(indexlsb-1,offsetlsb) === p_store_idx(indexlsb-1,offsetlsb))
val drain_store_val = (p_store_valid && (!io.cpu.req_val || req_store || Reg(tag_miss))) || p_store_match
val drain_store_val = (p_store_valid && (!io.cpu.req_val || !req_read || Reg(tag_miss))) || p_store_match
data_arb.io.in(2).bits.offset := p_store_idx(offsetmsb,ramindexlsb)
data_arb.io.in(2).bits.idx := p_store_idx(indexmsb,indexlsb)
data_arb.io.in(2).bits.rw := Bool(true)
@ -710,32 +674,38 @@ class HellaCache(lines: Int) extends Component {
data_arb.io.in(2).valid := drain_store_val
val drain_store_rdy = data_arb.io.in(2).ready
val drain_store = drain_store_val && drain_store_rdy
val p_store_notready = p_store_valid && !drain_store
p_store_valid <== p_store_notready || (tag_hit && r_req_store)
val p_store_rdy = !p_store_valid || drain_store
val p_amo = Reg(tag_hit && r_req_amo && drain_store_rdy && !p_store_match || r_replay_amo, resetVal = Bool(false))
p_store_valid <== !p_store_rdy || (tag_hit && r_req_store) || p_amo
// tag update after a miss or a store to an exclusive clean line.
val clear_valid = tag_miss && !r_req_flush && meta.io.resp.valid
val clear_valid = tag_miss && r_req_readwrite && meta.io.resp.valid && (!dirty || wb_rdy && !nack_wb)
val set_dirty = tag_hit && !meta.io.resp.dirty && r_req_write
meta.io.state_req.valid := clear_valid || set_dirty
meta.io.state_req.bits.rw := Bool(true)
meta.io.state_req.bits.idx := r_cpu_req_idx(indexmsb,indexlsb)
meta.io.state_req.bits.data.valid := tag_match
meta.io.state_req.bits.data.dirty := tag_match
// pending store data, also used for AMO RHS
val storegen = new StoreDataGen
val amoalu = new AMOALU
storegen.io.typ := r_cpu_req_type
storegen.io.addr := r_cpu_req_idx(offsetlsb-1, 0)
storegen.io.din := r_cpu_req_data
when (tag_hit && r_req_store && !p_store_notready) {
p_store_idx <== r_cpu_req_idx
p_store_type <== r_cpu_req_type
when (p_amo) {
p_store_data <== amoalu.io.out
}
when (tag_hit && r_req_write && p_store_rdy || r_replay_amo) {
p_store_idx <== Mux(r_replay_amo, Reg(Cat(replayer.io.data_req.bits.idx, replayer.io.data_req.bits.offset)), r_cpu_req_idx)
p_store_type <== Mux(r_replay_amo, Reg(replayer.io.data_req.bits.typ), r_cpu_req_type)
p_store_cmd <== Mux(r_replay_amo, Reg(replayer.io.data_req.bits.cmd), r_cpu_req_cmd)
p_store_data <== storegen.io.dout
}
// miss handling
val mshr = new MSHRFile
val replayer = new ReplayUnit
mshr.io.req_val := tag_miss && !r_req_flush && !nack_mshr
mshr.io.req_val := tag_miss && r_req_readwrite && !nack_mshr
mshr.io.req_ppn := io.cpu.req_ppn
mshr.io.req_idx := r_cpu_req_idx(indexmsb,indexlsb)
mshr.io.req_data := p_store_data
@ -744,9 +714,9 @@ class HellaCache(lines: Int) extends Component {
mshr.io.req_cmd := r_cpu_req_cmd
mshr.io.req_type := r_cpu_req_type
mshr.io.req_sdq_id := replayer.io.sdq_id
mshr.io.mem_resp_val := io.mem.resp_val
mshr.io.mem_resp_val := io.mem.resp_val && (~rr_count === UFix(0))
mshr.io.mem_resp_tag := io.mem.resp_tag
mshr.io.mem_req <> mem_arb.io.in(1)
mshr.io.mem_req <> wb.io.refill_req
mshr.io.meta_req <> meta_arb.io.in(1)
mshr.io.replay <> replayer.io.replay
replayer.io.sdq_enq.valid := tag_miss && r_req_write && !nack_sdq
@ -755,70 +725,94 @@ class HellaCache(lines: Int) extends Component {
// replays
val replay = replayer.io.data_req.bits
data_arb.io.in(3).bits.offset := replay.offset(offsetmsb,ramindexlsb)
data_arb.io.in(3).bits.idx := replay.idx
data_arb.io.in(3).bits.rw := replay.cmd === M_XWR
data_arb.io.in(3).bits.wmask := store_wmask_wide
data_arb.io.in(3).bits.data := store_data_wide
data_arb.io.in(3).valid := replayer.io.data_req.valid
replayer.io.data_req.ready := data_arb.io.in(3).ready
val stall_replay = r_replay_amo || p_amo || p_store_valid
val replay_val = replayer.io.data_req.valid && !stall_replay
data_arb.io.in(1).bits.offset := replay.offset(offsetmsb,ramindexlsb)
data_arb.io.in(1).bits.idx := replay.idx
data_arb.io.in(1).bits.rw := replay.cmd === M_XWR
data_arb.io.in(1).bits.wmask := store_wmask_wide
data_arb.io.in(1).bits.data := store_data_wide
data_arb.io.in(1).valid := replay_val
replayer.io.data_req.ready := data_arb.io.in(1).ready && !stall_replay
// store write mask generation.
// assumes pending stores are higher-priority than store replays.
// assumes store replays are higher-priority than pending stores.
val maskgen = new StoreMaskGen
val store_offset = Mux(drain_store_val, p_store_idx(offsetmsb,0), replay.offset)
maskgen.io.typ := Mux(drain_store_val, p_store_type, replay.typ)
val store_offset = Mux(!replay_val, p_store_idx(offsetmsb,0), replay.offset)
maskgen.io.typ := Mux(!replay_val, p_store_type, replay.typ)
maskgen.io.addr := store_offset(offsetlsb-1,0)
store_wmask_wide <== maskgen.io.wmask << Cat(store_offset(ramindexlsb-1,offsetlsb), Bits(0, log2up(CPU_DATA_BITS/8))).toUFix
val store_data = Mux(drain_store_val, p_store_data, replay.data)
val store_data = Mux(!replay_val, p_store_data, replay.data)
store_data_wide <== Fill(MEM_DATA_BITS/CPU_DATA_BITS, store_data)
// load data subword mux/sign extension.
// assumes load replays are higher-priority than load hits.
// subword loads are delayed by one cycle.
val loadgen = new LoadDataGen
val loadgen_use_replay = Reg(replayer.io.data_req.valid)
val loadgen_use_replay = Reg(replayer.io.data_req.valid && replayer.io.data_req.ready)
loadgen.io.typ := Mux(loadgen_use_replay, Reg(replay.typ), r_cpu_req_type)
loadgen.io.addr := Mux(loadgen_use_replay, Reg(replay.offset), r_cpu_req_idx)(offsetlsb-1,0)
loadgen.io.din := Slice(MEM_DATA_BITS/CPU_DATA_BITS, data.io.resp, r_cpu_req_idx(ramindexlsb-1,offsetlsb).toUFix)
loadgen.io.addr := Mux(loadgen_use_replay, Reg(replay.offset), r_cpu_req_idx)(ramindexlsb-1,0)
loadgen.io.din := data.io.resp
early_nack <== early_tag_nack || early_load_nack
amoalu.io.cmd := p_store_cmd
amoalu.io.typ := p_store_type
amoalu.io.lhs := loadgen.io.r_dout.toUFix
amoalu.io.rhs := p_store_data.toUFix
val nack_miss_wb = meta.io.resp.dirty && !wb_rdy
early_nack <== early_tag_nack || early_load_nack || r_cpu_req_val && r_req_amo || replay_amo || r_replay_amo
val nack_miss_wb = dirty && !wb_rdy
val nack_miss_mshr = !mshr.io.req_rdy
val nack_miss_sdq = r_req_write && !replayer.io.sdq_enq.ready
nack_wb <== nack_miss_mshr || nack_miss_sdq || p_store_notready || p_store_match
nack_mshr <== nack_miss_wb || nack_miss_sdq || p_store_notready || p_store_match
nack_sdq <== nack_miss_wb || nack_miss_mshr || p_store_notready || p_store_match
nack_wb <== nack_miss_mshr || nack_miss_sdq || !p_store_rdy || p_store_match
nack_mshr <== nack_miss_wb || nack_miss_sdq || !p_store_rdy || p_store_match
nack_sdq <== nack_miss_wb || nack_miss_mshr || !p_store_rdy || p_store_match
val nack_for_flush = r_req_flush && !flusher.io.req.ready
val nack = p_store_match || r_req_store && p_store_notready || early_nack ||
tag_miss && !r_req_flush && (nack_miss_wb || nack_miss_mshr || nack_miss_sdq || p_store_notready)
// reset and flush unit
val flusher = new FlushUnit(lines)
val flushed = Reg(resetVal = Bool(true))
val fence_rdy = mshr.io.fence_rdy && wb_rdy && p_store_rdy
flushed <== flushed && !r_cpu_req_val || flusher.io.req.valid && flusher.io.req.ready
flusher.io.req.valid := r_cpu_req_val && r_req_flush && fence_rdy && !flushed
flusher.io.wb_req <> wb_arb.io.in(0)
flusher.io.meta_req <> meta_arb.io.in(0)
flusher.io.meta_resp <> meta.io.resp
flusher.io.resp.ready := Bool(true) // we don't respond to flush requests
// report that cache is always ready. we nack instead.
io.cpu.req_rdy := Bool(true)
// we usually nack rather than reporting that the cache is not ready.
// fences and flushes are the exceptions.
val pending_fence = Reg(resetVal = Bool(false))
pending_fence <== (r_cpu_req_val && r_req_fence || pending_fence) && !fence_rdy
val nack = p_store_match ||
early_nack ||
!fence_rdy && (r_req_fence || r_req_flush) ||
!p_store_rdy && r_req_write ||
!flushed && r_req_flush ||
tag_miss && r_req_readwrite && (nack_miss_wb || nack_miss_mshr || nack_miss_sdq || !p_store_rdy) ||
!flusher.io.req.ready
io.cpu.req_rdy := flusher.io.req.ready && !pending_fence
io.cpu.resp_nack := r_cpu_req_val_ && !io.cpu.req_kill && nack
io.cpu.resp_val := (tag_hit && !nack && r_req_read) || flusher.io.resp.valid || replayer.io.cpu_resp_val
io.cpu.resp_val := (tag_hit && !nack && r_req_read) || replayer.io.cpu_resp_val
io.cpu.resp_miss := tag_miss && !nack && r_req_read
io.cpu.resp_tag := Mux(replayer.io.cpu_resp_val, replayer.io.cpu_resp_tag, Mux(flusher.io.resp.valid, flusher.io.resp.bits, r_cpu_req_tag))
io.cpu.resp_tag := Mux(replayer.io.cpu_resp_val, replayer.io.cpu_resp_tag, r_cpu_req_tag)
io.cpu.resp_data := loadgen.io.dout
io.cpu.resp_data_subword := loadgen.io.dout_subword
io.cpu.resp_data_subword := loadgen.io.r_dout_subword
val misaligned =
(((r_cpu_req_type === MT_H) || (r_cpu_req_type === MT_HU)) && (r_cpu_req_idx(0) != Bits(0))) ||
(((r_cpu_req_type === MT_W) || (r_cpu_req_type === MT_WU)) && (r_cpu_req_idx(1,0) != Bits(0))) ||
((r_cpu_req_type === MT_D) && (r_cpu_req_idx(2,0) != Bits(0)));
io.cpu.xcpt_ma_ld := r_cpu_req_val_ && !io.cpu.req_kill && r_req_read && misaligned
io.cpu.xcpt_ma_st := r_cpu_req_val_ && !io.cpu.req_kill && r_req_write && misaligned
io.cpu.xcpt_ma_ld := r_cpu_req_val_ && r_req_read && misaligned
io.cpu.xcpt_ma_st := r_cpu_req_val_ && r_req_write && misaligned
mem_arb.io.out.ready := io.mem.req_rdy
io.mem.req_val := mem_arb.io.out.valid
io.mem.req_rw := mem_arb.io.out.bits.rw
wb.io.mem_req.ready := io.mem.req_rdy
io.mem.req_val := wb.io.mem_req.valid
io.mem.req_rw := wb.io.mem_req.bits.rw
io.mem.req_wdata := wb.io.mem_req_data
io.mem.req_tag := mem_arb.io.out.bits.tag.toUFix
io.mem.req_addr := mem_arb.io.out.bits.addr
io.mem.req_tag := wb.io.mem_req.bits.tag.toUFix
io.mem.req_addr := wb.io.mem_req.bits.addr
}
}

5
rocket/src/main/scala/ptw.scala
View File

@ -19,6 +19,7 @@ class rocketDmemArbiter extends Component
// must delay ppn part of address from PTW by 1 cycle (to match TLB behavior)
val r_ptw_req_val = Reg(io.ptw.req_val);
val r_ptw_req_ppn = Reg(io.ptw.req_ppn);
val r_cpu_req_val = Reg(io.cpu.req_val && io.cpu.req_rdy);
io.mem.req_val := io.ptw.req_val || io.cpu.req_val;
io.mem.req_cmd := Mux(io.ptw.req_val, io.ptw.req_cmd, io.cpu.req_cmd);
@ -27,7 +28,7 @@ class rocketDmemArbiter extends Component
io.mem.req_ppn := Mux(r_ptw_req_val, r_ptw_req_ppn, io.cpu.req_ppn);
io.mem.req_data := io.cpu.req_data;
io.mem.req_tag := Cat(io.cpu.req_tag, io.ptw.req_val);
io.mem.req_kill := io.cpu.req_kill;
io.mem.req_kill := io.cpu.req_kill && r_cpu_req_val;
io.ptw.req_rdy := io.mem.req_rdy;
io.cpu.req_rdy := io.mem.req_rdy && !io.ptw.req_val;
@ -96,7 +97,7 @@ class rocketPTW extends Component
(state === s_l2_req) ||
(state === s_l3_req);
io.dmem.req_cmd := M_PRD;
io.dmem.req_cmd := M_XRD;
io.dmem.req_type := MT_D;
// io.dmem.req_addr := req_addr;
io.dmem.req_idx := req_addr(PGIDX_BITS-1,0);

12
rocket/src/main/scala/util.scala
View File

@ -10,18 +10,6 @@ object log2up
def apply(in: Int) = ceil(log(in)/log(2)).toInt
}
object Slice
{
def apply(n: Int, in: Bits, sel: Bits) =
{
val w = in.width / n
var out = in(w-1, 0) & Fill(w, sel === UFix(0))
for (i <- 1 until n)
out = out | (in((i+1)*w-1, i*w) & Fill(w, sel === Bits(i)))
if (n > 1) out else in
}
}
object FillInterleaved
{
def apply(n: Int, in: Bits) =