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scratchpad optimization for stack access using custom bank offset aligned to stack size

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This commit is contained in:
Blaise Tine
2021-01-02 16:00:00 -05:00
parent 30d950ada2
commit 2d69ca5d67
17 changed files with 339 additions and 311 deletions
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48
hw/rtl/cache/VX_cache.v vendored
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@@ -6,7 +6,7 @@ module VX_cache #(
// Size of cache in bytes
parameter CACHE_SIZE = 8092,
// Size of line inside a bank in bytes
parameter BANK_LINE_SIZE = 16,
parameter CACHE_LINE_SIZE = 16,
// Number of banks
parameter NUM_BANKS = 4,
// Size of a word in bytes
@@ -42,7 +42,10 @@ module VX_cache #(
parameter CORE_TAG_ID_BITS = 0,
// dram request tag size
parameter DRAM_TAG_WIDTH = (32 - $clog2(BANK_LINE_SIZE))
parameter DRAM_TAG_WIDTH = (32 - $clog2(CACHE_LINE_SIZE)),
// bank offset from beginning of index range
parameter BANK_ADDR_OFFSET = 0
) (
`SCOPE_IO_VX_cache
@@ -72,20 +75,21 @@ module VX_cache #(
// DRAM request
output wire dram_req_valid,
output wire dram_req_rw,
output wire [BANK_LINE_SIZE-1:0] dram_req_byteen,
output wire [CACHE_LINE_SIZE-1:0] dram_req_byteen,
output wire [`DRAM_ADDR_WIDTH-1:0] dram_req_addr,
output wire [`BANK_LINE_WIDTH-1:0] dram_req_data,
output wire [`CACHE_LINE_WIDTH-1:0] dram_req_data,
output wire [DRAM_TAG_WIDTH-1:0] dram_req_tag,
input wire dram_req_ready,
// DRAM response
input wire dram_rsp_valid,
input wire [`BANK_LINE_WIDTH-1:0] dram_rsp_data,
input wire [`CACHE_LINE_WIDTH-1:0] dram_rsp_data,
input wire [DRAM_TAG_WIDTH-1:0] dram_rsp_tag,
output wire dram_rsp_ready
);
`STATIC_ASSERT(NUM_BANKS <= NUM_REQS, ("invalid value"))
`UNUSED_VAR (dram_rsp_tag)
wire [NUM_BANKS-1:0] per_bank_core_req_valid;
wire [NUM_BANKS-1:0][`REQS_BITS-1:0] per_bank_core_req_tid;
@@ -104,9 +108,9 @@ module VX_cache #(
wire [NUM_BANKS-1:0] per_bank_dram_req_valid;
wire [NUM_BANKS-1:0] per_bank_dram_req_rw;
wire [NUM_BANKS-1:0][BANK_LINE_SIZE-1:0] per_bank_dram_req_byteen;
wire [NUM_BANKS-1:0][CACHE_LINE_SIZE-1:0] per_bank_dram_req_byteen;
wire [NUM_BANKS-1:0][`DRAM_ADDR_WIDTH-1:0] per_bank_dram_req_addr;
wire [NUM_BANKS-1:0][`BANK_LINE_WIDTH-1:0] per_bank_dram_req_data;
wire [NUM_BANKS-1:0][`CACHE_LINE_WIDTH-1:0] per_bank_dram_req_data;
wire [NUM_BANKS-1:0] per_bank_dram_req_ready;
wire [NUM_BANKS-1:0] per_bank_dram_rsp_ready;
@@ -119,11 +123,12 @@ module VX_cache #(
`endif
VX_cache_core_req_bank_sel #(
.BANK_LINE_SIZE (BANK_LINE_SIZE),
.NUM_BANKS (NUM_BANKS),
.WORD_SIZE (WORD_SIZE),
.NUM_REQS (NUM_REQS),
.CORE_TAG_WIDTH (CORE_TAG_WIDTH)
.CACHE_LINE_SIZE (CACHE_LINE_SIZE),
.NUM_BANKS (NUM_BANKS),
.WORD_SIZE (WORD_SIZE),
.NUM_REQS (NUM_REQS),
.CORE_TAG_WIDTH (CORE_TAG_WIDTH),
.BANK_ADDR_OFFSET(BANK_ADDR_OFFSET)
) cache_core_req_bank_sel (
.clk (clk),
.reset (reset),
@@ -174,13 +179,13 @@ module VX_cache #(
wire curr_bank_dram_req_valid;
wire curr_bank_dram_req_rw;
wire [BANK_LINE_SIZE-1:0] curr_bank_dram_req_byteen;
wire [CACHE_LINE_SIZE-1:0] curr_bank_dram_req_byteen;
wire [`LINE_ADDR_WIDTH-1:0] curr_bank_dram_req_addr;
wire[`BANK_LINE_WIDTH-1:0] curr_bank_dram_req_data;
wire[`CACHE_LINE_WIDTH-1:0] curr_bank_dram_req_data;
wire curr_bank_dram_req_ready;
wire curr_bank_dram_rsp_valid;
wire [`BANK_LINE_WIDTH-1:0] curr_bank_dram_rsp_data;
wire [`CACHE_LINE_WIDTH-1:0] curr_bank_dram_rsp_data;
wire [`LINE_ADDR_WIDTH-1:0] curr_bank_dram_rsp_addr;
wire curr_bank_dram_rsp_ready;
@@ -208,7 +213,7 @@ module VX_cache #(
if (NUM_BANKS == 1) begin
assign per_bank_dram_req_addr[i] = curr_bank_dram_req_addr;
end else begin
assign per_bank_dram_req_addr[i] = `LINE_TO_DRAM_ADDR(curr_bank_dram_req_addr, i);
assign per_bank_dram_req_addr[i] = `LINE_TO_DRAM_ADDR(curr_bank_dram_req_addr, i);
end
assign per_bank_dram_req_data[i] = curr_bank_dram_req_data;
assign curr_bank_dram_req_ready = per_bank_dram_req_ready[i];
@@ -219,7 +224,7 @@ module VX_cache #(
assign curr_bank_dram_rsp_addr = dram_rsp_tag;
end else begin
assign curr_bank_dram_rsp_valid = dram_rsp_valid && (`DRAM_ADDR_BANK(dram_rsp_tag) == i);
assign curr_bank_dram_rsp_addr = `DRAM_TO_LINE_ADDR(dram_rsp_tag);
assign curr_bank_dram_rsp_addr = `DRAM_TO_LINE_ADDR(dram_rsp_tag);
end
assign curr_bank_dram_rsp_data = dram_rsp_data;
assign per_bank_dram_rsp_ready[i] = curr_bank_dram_rsp_ready;
@@ -228,7 +233,7 @@ module VX_cache #(
.BANK_ID (i),
.CACHE_ID (CACHE_ID),
.CACHE_SIZE (CACHE_SIZE),
.BANK_LINE_SIZE (BANK_LINE_SIZE),
.CACHE_LINE_SIZE (CACHE_LINE_SIZE),
.NUM_BANKS (NUM_BANKS),
.WORD_SIZE (WORD_SIZE),
.NUM_REQS (NUM_REQS),
@@ -241,7 +246,8 @@ module VX_cache #(
.WRITE_ENABLE (WRITE_ENABLE),
.WRITE_THROUGH (WRITE_THROUGH),
.CORE_TAG_WIDTH (CORE_TAG_WIDTH),
.CORE_TAG_ID_BITS (CORE_TAG_ID_BITS)
.CORE_TAG_ID_BITS (CORE_TAG_ID_BITS),
.BANK_ADDR_OFFSET (BANK_ADDR_OFFSET)
) bank (
`SCOPE_BIND_VX_cache_bank(i)
@@ -309,14 +315,14 @@ module VX_cache #(
);
if (DRAM_ENABLE) begin
wire [NUM_BANKS-1:0][(`DRAM_ADDR_WIDTH + 1 + BANK_LINE_SIZE + `BANK_LINE_WIDTH)-1:0] data_in;
wire [NUM_BANKS-1:0][(`DRAM_ADDR_WIDTH + 1 + CACHE_LINE_SIZE + `CACHE_LINE_WIDTH)-1:0] data_in;
for (genvar i = 0; i < NUM_BANKS; i++) begin
assign data_in[i] = {per_bank_dram_req_addr[i], per_bank_dram_req_rw[i], per_bank_dram_req_byteen[i], per_bank_dram_req_data[i]};
end
VX_stream_arbiter #(
.NUM_REQS (NUM_BANKS),
.DATAW (`DRAM_ADDR_WIDTH + 1 + BANK_LINE_SIZE + `BANK_LINE_WIDTH),
.DATAW (`DRAM_ADDR_WIDTH + 1 + CACHE_LINE_SIZE + `CACHE_LINE_WIDTH),
.BUFFERED (1)
) dram_req_arb (
.clk (clk),