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Merge pull request #68 from ucb-bar/test-and-fix-backup-mem

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Fix the backup memory port
This commit is contained in:
Palmer Dabbelt 2016-02-27 12:19:55 -08:00
commit 7fa38b5624
5 changed files with 45 additions and 26 deletions
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18
src/main/scala/Configs.scala
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@ -87,13 +87,15 @@ class DefaultConfig extends Config (
case PPNBits => site(PAddrBits) - site(PgIdxBits)
case VAddrBits => site(VPNBits) + site(PgIdxBits)
case ASIdBits => 7
case MIFTagBits => // Bits needed at the L2 agent
case MIFTagBits => Dump("MIF_TAG_BITS",
// Bits needed at the L2 agent
log2Up(site(NAcquireTransactors)+2) +
// Bits added by NASTI interconnect
max(log2Up(site(MaxBanksPerMemoryChannel)),
(if (site(UseDma)) 3 else 2))
case MIFDataBits => 64
case MIFAddrBits => site(PAddrBits) - site(CacheBlockOffsetBits)
(if (site(UseDma)) 3 else 2)))
case MIFDataBits => Dump("MIF_DATA_BITS", 64)
case MIFAddrBits => Dump("MIF_ADDR_BITS",
site(PAddrBits) - site(CacheBlockOffsetBits))
case MIFDataBeats => site(CacheBlockBytes) * 8 / site(MIFDataBits)
case NastiKey => {
Dump("MEM_STRB_BITS", site(MIFDataBits) / 8)
@ -442,10 +444,16 @@ class DualChannelBenchmarkConfig extends Config(new With2MemoryChannels ++ new S
class QuadChannelBenchmarkConfig extends Config(new With4MemoryChannels ++ new SingleChannelBenchmarkConfig)
class OctoChannelBenchmarkConfig extends Config(new With8MemoryChannels ++ new SingleChannelBenchmarkConfig)
class EightChannelVLSIConfig extends Config(new With8MemoryChannels ++ new DefaultVLSIConfig)
class WithOneOrMaxChannels extends Config(
(pname, site, here) => pname match {
case MemoryChannelMuxConfigs => Dump("MEMORY_CHANNEL_MUX_CONFIGS", List(1, site(NMemoryChannels)))
}
)
class OneOrEightChannelBenchmarkConfig extends Config(new WithOneOrMaxChannels ++ new With8MemoryChannels ++ new SingleChannelBenchmarkConfig)
class OneOrEightChannelVLSIConfig extends Config(new WithOneOrMaxChannels ++ new EightChannelVLSIConfig)
class SimulateBackupMemConfig extends Config(){ Dump("MEM_BACKUP_EN", true) }
class BackupMemVLSIConfig extends Config(new SimulateBackupMemConfig ++ new DefaultVLSIConfig)
class OneOrEightChannelBackupMemVLSIConfig extends Config(new WithOneOrMaxChannels ++ new With8MemoryChannels ++ new BackupMemVLSIConfig)

9
src/main/scala/RocketChip.scala
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@ -334,6 +334,13 @@ class OuterMemorySystem(implicit val p: Parameters) extends Module with HasTopLe
if(p(UseBackupMemoryPort)) {
VLSIUtils.doOuterMemorySystemSerdes(
mem_channels, io.mem, io.mem_backup, io.mem_backup_en,
nMemChannels, htifW, p(CacheBlockOffsetBits))
1, htifW, p(CacheBlockOffsetBits))
for (i <- 1 until nMemChannels) { io.mem(i) <> mem_channels(i) }
assert(!Vec(mem_channels.map{ io => io.r.valid }).toBits.orR ||
!io.mem_backup_en ||
Vec(channelConfigs.map{i => UInt(i)})(io.memory_channel_mux_select) === UInt(1),
"Backup memory port only works when 1 memory channel is enabled")
Predef.assert(channelConfigs.sortWith(_ < _)(0) == 1,
"Backup memory port requires a single memory port mux config")
} else { io.mem <> mem_channels }
}

2
vsim/Makefrag
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@ -67,8 +67,6 @@ $(simv_debug) : $(sim_vsrcs) $(sim_csrcs) $(sim_dir)/libdramsim.a $(consts_heade
$(VCS) $(VCS_OPTS) -o $(simv_debug) \
+define+DEBUG -debug_pp \
# +define+MEM_BACKUP_EN \
#--------------------------------------------------------------------
# Run
#--------------------------------------------------------------------

28
vsrc/backup_mem.v
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@ -42,27 +42,27 @@ module BackupMemory
input mem_req_valid,
output mem_req_ready,
input mem_req_rw,
input [`MEM_ADDR_BITS-1:0] mem_req_addr,
input [`MEM_TAG_BITS-1:0] mem_req_tag,
input [`MIF_ADDR_BITS-1:0] mem_req_addr,
input [`MIF_TAG_BITS-1:0] mem_req_tag,
input mem_req_data_valid,
output mem_req_data_ready,
input [`MEM_DATA_BITS-1:0] mem_req_data_bits,
input [`MIF_DATA_BITS-1:0] mem_req_data_bits,
output reg mem_resp_valid,
output reg [`MEM_DATA_BITS-1:0] mem_resp_data,
output reg [`MEM_TAG_BITS-1:0] mem_resp_tag
output reg [`MIF_DATA_BITS-1:0] mem_resp_data,
output reg [`MIF_TAG_BITS-1:0] mem_resp_tag
);
localparam DATA_CYCLES = 4;
localparam DATA_CYCLES = 8;
localparam DEPTH = 2*1024*1024;
reg [`ceilLog2(DATA_CYCLES)-1:0] cnt;
reg [`MEM_TAG_BITS-1:0] tag;
reg [`MIF_TAG_BITS-1:0] tag;
reg state_busy, state_rw;
reg [`MEM_ADDR_BITS-1:0] addr;
reg [`MIF_ADDR_BITS-1:0] addr;
reg [`MEM_DATA_BITS-1:0] ram [DEPTH-1:0];
reg [127:0] ram [DEPTH-1:0];
wire [`ceilLog2(DEPTH)-1:0] ram_addr = state_busy ? {addr[`ceilLog2(DEPTH/DATA_CYCLES)-1:0], cnt}
: {mem_req_addr[`ceilLog2(DEPTH/DATA_CYCLES)-1:0], cnt};
wire do_read = mem_req_valid && mem_req_ready && !mem_req_rw || state_busy && !state_rw;
@ -97,9 +97,15 @@ module BackupMemory
cnt <= cnt + 1'b1;
if (do_write)
ram[ram_addr] <= mem_req_data_bits;
if (ram_addr[0] == 1'b0)
ram[ram_addr/2][63:0] <= mem_req_data_bits;
else
mem_resp_data <= ram[ram_addr];
ram[ram_addr/2][127:64] <= mem_req_data_bits;
else
if (ram_addr[0] == 1'b0)
mem_resp_data <= ram[ram_addr/2][63:0];
else
mem_resp_data <= ram[ram_addr/2][127:64];
if (reset)
mem_resp_valid <= 1'b0;

14
vsrc/rocketTestHarness.v
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@ -88,12 +88,12 @@ module rocketTestHarness;
end
wire mem_bk_req_valid, mem_bk_req_rw, mem_bk_req_data_valid;
wire [`MEM_ID_BITS-1:0] mem_bk_req_tag;
wire [`MEM_ADDR_BITS-1:0] mem_bk_req_addr;
wire [`MEM_DATA_BITS-1:0] mem_bk_req_data_bits;
wire [`MIF_TAG_BITS-1:0] mem_bk_req_tag;
wire [`MIF_ADDR_BITS-1:0] mem_bk_req_addr;
wire [`MIF_DATA_BITS-1:0] mem_bk_req_data_bits;
wire mem_bk_req_ready, mem_bk_req_data_ready, mem_bk_resp_valid;
wire [`MEM_ID_BITS-1:0] mem_bk_resp_tag;
wire [`MEM_DATA_BITS-1:0] mem_bk_resp_data;
wire [`MIF_TAG_BITS-1:0] mem_bk_resp_tag;
wire [`MIF_DATA_BITS-1:0] mem_bk_resp_data;
`ifdef MEM_BACKUP_EN
memdessertMemDessert dessert
@ -150,9 +150,9 @@ module rocketTestHarness;
assign mem_in_bits = {`HTIF_WIDTH {1'b0}};
assign mem_bk_req_valid = 1'b0;
assign mem_bk_req_ready = 1'b0;
assign mem_bk_req_addr = {`MEM_ADDR_BITS {1'b0}};
assign mem_bk_req_addr = {`MIF_ADDR_BITS {1'b0}};
assign mem_bk_req_rw = 1'b0;
assign mem_bk_req_tag = {`MEM_ID_BITS {1'b0}};
assign mem_bk_req_tag = {`MIF_TAG_BITS {1'b0}};
assign mem_bk_req_data_valid = 1'b0;
assign mem_bk_req_data_bits = 16'd0;
`endif