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Foundry/tt/tests/test_reduce_max_multitile.c

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/* SPDX-License-Identifier: AGPL-3.0-or-later */
/* Copyright (C) 2026 David (Corey) Herrera */
/**
* @file test_reduce_max_multitile.c
* @brief ON-CARD probe answering ONE question: may a row-wise MAX reduce WIDER THAN ONE
* TILE be expressed as repeated `reduce_tile<PoolType::MAX>` calls accumulating into the
* same DST? `kernels/ft_tensix_compute_reduce.h` (ft_tensix_math_reduce_row_max) records
* the doubt; `kernels/resident_reduce_compute.c` already ships the loop.
*
* ---------------------------------------------------------------------------
* WHY THIS IS NOT A SOFTMAX TEST
* ---------------------------------------------------------------------------
* softmax(x - c) = softmax(x) for ANY c, so a wrong row maximum is structurally invisible
* in softmax's OUTPUT unless it drives exp out of range. test_phase6_vector.c's outlier
* check plants its +200 in the LAST tile — and the failure mode suspected here is that
* EARLIER tiles' accumulators are dropped, which leaves the LAST tile's maximum intact.
* That test therefore passes whether or not the defect exists. This probe does not use
* softmax at all.
*
* ---------------------------------------------------------------------------
* WHAT IT RUNS INSTEAD, AND WHY IT IS STILL THE SHIPPING KERNEL
* ---------------------------------------------------------------------------
* The SHIPPING `resident_reduce_compute.c` triad, unmodified, driven with a program the
* host's four named members do not name:
*
* pass count 1 · pass0 = MAX / map NONE / verb NONE / no eps · source IN · chain SCALE
*
* i.e. y[r][c] = x[r][c] * rowmax(r). That is byte-for-byte the ROUTER NORMALISE program
* shape (1 pass, source IN, chain SCALE, no gamma/beta/eps/mid, scaler 1.0) with two bytes
* changed: pool SUM->MAX and verb RECIP->NONE. So every dataflow path it exercises is one
* already green on card, and nothing but the pool differs. The host request is built for
* FT_TT_OP_REDUCE_FN_ROUTER_NORMALISE and the three program words are overwritten after
* ft_tt_op_reduce_parameters() — a TEST-side override; no kernel and no backend source is
* touched.
*
* With the row's background set to exactly 1.0, y[r][0] IS rowmax(r), read straight out of
* DRAM. No correlation, no budget, no invariance: a number, per row, compared to a number.
*
* ---------------------------------------------------------------------------
* WHAT DISTINGUISHES THE TWO OUTCOMES
* ---------------------------------------------------------------------------
* Each row carries ONE spike per tile, and the spikes are per-row distinct so a wrong
* answer can never coincide with a right one:
*
* case B (the question): tile 0 spike = 100+r tile 1 spike = 40+r
* case C (the mirror): tile 0 spike = 40+r tile 1 spike = 100+r
* case D (depth 4): tile 0 = 100+r, tile 1 = 40+r, tile 2 = 30+r, tile 3 = 20+r
*
* The true row max is 100+r in all three. If the first reduce_tile's accumulator does not
* survive the second's transpose, case B reports ~40+r and case C still reports 100+r —
* the two are 60 apart at every row and the ARM that failed is named by which case moved.
* Case D says whether it is "only the last tile survives" or something else again.
*
* ---------------------------------------------------------------------------
* THE NEGATIVE CONTROL RUNS FIRST, AND IT IS A REAL DEVICE RUN
* ---------------------------------------------------------------------------
* Stage 1 uploads case C's data (64 columns, the true max in tile 1) and then asks the card
* for `tile_cols = 1`. The kernel genuinely reduces one tile of a two-tile row — which IS
* the defect under investigation, induced by a descriptor rather than by a mutation — and
* the harness must report it RED against the 64-wide reference and GREEN against the
* 32-wide one. Until that pair prints, a green stage 2 means nothing.
*
* Environment:
* FT_TT_TENSIX_INDEX which enabled Tensix to drive
* FT_TT_FIRMWARE_DIR the program directory whose fw_*.elf to boot
*
* Usage:
* FT_TT_FIRMWARE_DIR=<dir> FT_TT_TENSIX_INDEX=60 \
* ./build-vector-card/test_reduce_max_multitile <reduce-program-dir>
*
* @status Probe. Not part of any acceptance suite.
* @issues None
* @todo None
*/
#define _POSIX_C_SOURCE 200809L
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../convert/ft_float_convert.h"
#include "../ft_tt_coord.h"
#include "../ft_tt_op_dispatch.h"
#include "../ft_tt_op_l1_layout.h"
#include "../ft_tt_op_vector.h"
#include "../ft_tt_queue.h"
#include "../ft_tt_tilize.h"
#include "../ft_tt_watchdog.h"
#include "ft_tt_hardware_session.h"
#include "ft_tt_program_directory.h"
#include "ft_tt_test_report.h"
#define POISON_BYTE 0x5A
#define TILE_BYTES FT_TT_OP_TILE_BYTES_BF16
#define TILE_DIM FT_TT_OP_TILE_DIM
#define RUN_TIMEOUT_MS 20000u
#define QUEUE_CAPACITY 64u
#define DRAM_BANK_A 2u
#define DRAM_BANK_C 4u
#define DRAM_BANK_CONST 5u
#define DRAM_BANK_COUNT 6u
#define DRAM_BUFFER_BASE 0x00100000u
#define IDLE_SPIN_LIMIT 400000000u
#define CB_SPIN_LIMIT 400000000u
#define TRIAD_MASK \
((1u << FT_TT_PROC_DM0) | (1u << FT_TT_PROC_DM1) | (1u << FT_TT_PROC_MATH0) | \
(1u << FT_TT_PROC_MATH1) | (1u << FT_TT_PROC_MATH2))
/** Rows: ONE row block, so the only accumulation under test is the one across tiles. */
#define PROBE_ROWS 32u
/** The deepest row any case runs; the residency is placed for it once. */
#define PROBE_MAX_TILE_COLS 4u
/** A max is a max: the readback must be EXACT in bf16, not close. */
#define EXACT_TOLERANCE 0.0f
/** The carrier the probe reuses: one pass, source IN, chain SCALE, scaler 1.0, no gamma,
* no beta, no eps, no intermediate — the same dataflow the MAX program needs. */
#define CARRIER_FUNCTION FT_TT_OP_REDUCE_FN_ROUTER_NORMALISE
static ft_tt_noc_coord g_dram[DRAM_BANK_COUNT];
static ft_tt_launch_core_placement g_placement_storage[1];
static ft_tt_core_group g_group;
static ft_tt_program_directory g_reduce;
static ft_tt_launch_config g_config;
static ft_tt_queue g_queue;
static ft_tt_launch_cb_entry g_cb_placed[FT_TT_OP_MAX_CB];
static unsigned char g_cb_buffer[FT_TT_NUM_CIRCULAR_BUFFERS * FT_TT_WORDS_PER_LOCAL_CB_CONFIG * 4];
/** How many descriptors have completed on the resident triad so far. */
static uint32_t g_slot;
/**
* Run the DIAGNOSTIC stages (5-10) as well as the verdict ones?
*
* Off by default, and that is a safety property rather than a preference: stages 8-10 send
* descriptors whose width does not divide the residency's buffers, `descriptor_is_executable()`
* REFUSES them, and a refused descriptor deliberately does not retire its slot -- so the
* host's wait times out and the triad is left holding a queue it will never drain. That is
* correct kernel behaviour and a stuck core for whoever runs it. The verdict stages size
* every residency to its own descriptor and are refused by nothing.
*/
static bool diagnostics_enabled(void)
{
const char *value = getenv("FT_PROBE_DIAGNOSTICS");
return value && value[0] == '1';
}
/* ================================================================
* Device access
* ================================================================ */
static int device_write(const ft_tt_noc_access *noc, ft_tt_noc_coord where, uint32_t address,
const void *source, size_t bytes)
{
const unsigned char *cursor = source;
size_t offset = 0;
while (offset < bytes) {
size_t chunk = bytes - offset;
int rc;
if (chunk > 0x10000u)
chunk = 0x10000u;
rc = noc->write(noc->user, (uint16_t)where.x, (uint16_t)where.y,
(uint64_t)address + offset, cursor + offset, chunk);
if (rc != FT_TT_OK)
return rc;
offset += chunk;
}
return FT_TT_OK;
}
static int device_read(const ft_tt_noc_access *noc, ft_tt_noc_coord where, uint32_t address,
void *destination, size_t bytes)
{
unsigned char *cursor = destination;
size_t offset = 0;
while (offset < bytes) {
size_t chunk = bytes - offset;
int rc;
if (chunk > 0x10000u)
chunk = 0x10000u;
rc = noc->read(noc->user, (uint16_t)where.x, (uint16_t)where.y,
(uint64_t)address + offset, cursor + offset, chunk);
if (rc != FT_TT_OK)
return rc;
offset += chunk;
}
return FT_TT_OK;
}
static int poison_output(const ft_tt_noc_access *noc, size_t bytes)
{
unsigned char pattern[0x1000];
size_t offset = 0;
memset(pattern, POISON_BYTE, sizeof(pattern));
while (offset < bytes) {
size_t chunk = bytes - offset;
int rc;
if (chunk > sizeof(pattern))
chunk = sizeof(pattern);
rc = device_write(noc, g_dram[DRAM_BANK_C], DRAM_BUFFER_BASE + (uint32_t)offset, pattern,
chunk);
if (rc != FT_TT_OK)
return rc;
offset += chunk;
}
return FT_TT_OK;
}
static size_t poison_remaining(const void *data, size_t bytes)
{
const unsigned char *cursor = data;
size_t remaining = 0;
size_t index;
for (index = 0; index < bytes; index++)
if (cursor[index] == POISON_BYTE)
remaining++;
return remaining;
}
/* ================================================================
* Tilize / untilize
* ================================================================ */
static int to_bf16_tiles(const float *matrix, uint32_t rows, uint32_t cols, uint16_t *out)
{
uint16_t *plain = malloc((size_t)rows * cols * sizeof(uint16_t));
size_t index;
int rc;
if (!plain)
return FT_TT_ENOMEM;
for (index = 0; index < (size_t)rows * cols; index++)
plain[index] = ft_bf16_from_float(matrix[index]);
rc = ft_tt_tilize_matrix(plain, sizeof(uint16_t), rows, cols, out);
free(plain);
return (rc == 0) ? FT_TT_OK : FT_TT_EINVAL;
}
static int from_bf16_tiles(const uint16_t *tiles, uint32_t rows, uint32_t cols, float *out)
{
uint16_t *plain = malloc((size_t)rows * cols * sizeof(uint16_t));
size_t index;
int rc;
if (!plain)
return FT_TT_ENOMEM;
rc = ft_tt_untilize_matrix(tiles, sizeof(uint16_t), rows, cols, plain);
if (rc == 0) {
for (index = 0; index < (size_t)rows * cols; index++)
out[index] = ft_float_from_bf16(plain[index]);
}
free(plain);
return (rc == 0) ? FT_TT_OK : FT_TT_EINVAL;
}
/* ================================================================
* Bringing the resident reduce triad up
* ================================================================ */
static int load_images(const ft_tt_noc_access *noc, uint16_t x, uint16_t y,
const ft_tt_program_directory *program)
{
unsigned index;
for (index = 0; index < program->program.image_count; index++) {
const ft_tt_kernel_image *image = &program->program.images[index];
int rc = ft_tt_launch_load_image(noc, x, y, image->processor, FT_TT_IMAGE_KERNEL,
image->elf_data, image->elf_size, NULL);
if (rc != FT_TT_OK)
return rc;
}
return FT_TT_OK;
}
static int start_triad(const ft_tt_noc_access *noc, uint16_t x, uint16_t y)
{
static const unsigned processors[5] = { FT_TT_PROC_DM0, FT_TT_PROC_DM1, FT_TT_PROC_MATH0,
FT_TT_PROC_MATH1, FT_TT_PROC_MATH2 };
uint32_t args[5][FT_TT_QUEUE_KERNEL_ARG_COUNT];
ft_tt_op_args blocks[5];
unsigned index;
int rc;
for (index = 0; index < 5u; index++) {
ft_tt_queue_kernel_binding binding;
memset(&binding, 0, sizeof(binding));
binding.idle_spin_limit = IDLE_SPIN_LIMIT;
binding.cb_wait_spin_limit = CB_SPIN_LIMIT;
binding.status_address =
FT_TT_QUEUE_STATUS_ADDRESS(g_queue.control_address, processors[index]);
rc = ft_tt_queue_kernel_args(&g_queue, &binding, args[index]);
if (rc != FT_TT_OK)
return rc;
blocks[index].processor = processors[index];
blocks[index].values = args[index];
blocks[index].count = FT_TT_QUEUE_KERNEL_ARG_COUNT;
}
rc = ft_tt_op_stage(noc, x, y, &g_config, g_cb_buffer, sizeof(g_cb_buffer), blocks, 5u);
if (rc != FT_TT_OK)
return rc;
return ft_tt_launch_send_go(noc, x, y);
}
static void retire_triad(const ft_tt_noc_access *noc, const char *label)
{
uint32_t unstopped = 0u;
int rc = ft_tt_watchdog_shutdown(noc, &g_group, RUN_TIMEOUT_MS, &unstopped);
ft_tt_test_check_fmt(label, rc == FT_TT_OK && unstopped == 0u, "rc=%d unstopped=0x%X", rc,
unstopped);
}
static int start_reduce_triad(const ft_tt_hardware_session *session, uint16_t x, uint16_t y,
const ft_tt_op_reduce_residency *residency)
{
uint64_t mask = 0;
int rc = load_images(&session->noc, x, y, &g_reduce);
if (rc == FT_TT_OK)
rc = ft_tt_op_program_load(&session->noc, x, y, &g_reduce.program, NULL, &g_config);
if (rc == FT_TT_OK)
rc = ft_tt_op_reduce_place_cbs(residency, g_cb_placed, g_cb_buffer, sizeof(g_cb_buffer),
&mask);
if (rc != FT_TT_OK)
return rc;
g_config.local_cb_mask = mask;
g_config.local_cb_config_address = FT_TT_OP_CB_CONFIG_ADDRESS;
g_config.brisc_noc_id = 0u;
rc = ft_tt_queue_init(&session->noc, x, y, FT_TT_OP_QUEUE_BASE, QUEUE_CAPACITY,
ft_tt_queue_make_nonce(), &g_queue);
if (rc != FT_TT_OK)
return rc;
return start_triad(&session->noc, x, y);
}
/* ================================================================
* The operands
* ================================================================ */
/** One spike: at `column`, every row r carries `base + r`. */
typedef struct spike {
uint32_t column;
float base;
} spike;
/**
* A row of 1.0 with one spike per tile.
*
* 1.0 as the background is load-bearing twice over: y = x * rowmax means y[r][0] IS
* rowmax(r) with no division to blur it, and every value here (1, 20..131) is exact in
* bf16, so a mismatch is a wrong answer and never a rounding.
*/
static void build_input(float *x, uint32_t rows, uint32_t cols, const spike *spikes,
size_t spike_count)
{
size_t index;
uint32_t row;
for (index = 0; index < (size_t)rows * cols; index++)
x[index] = 1.0f;
for (row = 0; row < rows; row++) {
size_t which;
for (which = 0; which < spike_count; which++)
x[(size_t)row * cols + spikes[which].column] = spikes[which].base + (float)row;
}
/* Round through bf16 HERE, so the reference is computed from the values the card will
* actually see. Without it a base of 300 reads as a defect: bf16 steps by 2 above 256,
* so 301 is not representable and a correct card returns 300 or 302 against a reference
* that says 301. The bases below are all bf16-exact anyway; this makes that a property
* of the code rather than of the person who chose them. */
for (index = 0; index < (size_t)rows * cols; index++)
x[index] = ft_float_from_bf16(ft_bf16_from_float(x[index]));
}
/** The row maxima over columns [first_col, last_col). The reference, computed from the
* DEFINITION of a max over the host's own copy of the data — never from the kernel. */
static void reference_max(const float *x, uint32_t rows, uint32_t cols, uint32_t first_col,
uint32_t last_col, float *out)
{
uint32_t row;
for (row = 0; row < rows; row++) {
float best = x[(size_t)row * cols + first_col];
uint32_t col;
for (col = first_col + 1u; col < last_col; col++) {
const float value = x[(size_t)row * cols + col];
if (value > best)
best = value;
}
out[row] = best;
}
}
static int upload_operands(const ft_tt_hardware_session *session, const float *x, uint32_t rows,
uint32_t cols, uint16_t *tiles, size_t output_bytes)
{
const size_t bytes = (size_t)(rows / TILE_DIM) * (cols / TILE_DIM) * TILE_BYTES;
const size_t constant_bytes =
ft_tt_op_reduce_constants_bytes(CARRIER_FUNCTION, cols / TILE_DIM, TILE_BYTES);
unsigned char *constants = malloc(constant_bytes);
int rc;
if (!constants)
return FT_TT_ENOMEM;
/* The carrier's scaler is 1.0, which is also what upstream uses for MAX
* (ttnn/kernel_lib/reduce_helpers_dataflow.hpp: for SUM/MAX the scaler is 1.0). */
rc = ft_tt_op_reduce_build_constants(CARRIER_FUNCTION, cols, 0.0f, NULL, NULL, constants,
constant_bytes);
if (rc == FT_TT_OK)
rc = to_bf16_tiles(x, rows, cols, tiles);
if (rc == FT_TT_OK)
rc = device_write(&session->noc, g_dram[DRAM_BANK_A], DRAM_BUFFER_BASE, tiles, bytes);
if (rc == FT_TT_OK)
rc = device_write(&session->noc, g_dram[DRAM_BANK_CONST], DRAM_BUFFER_BASE, constants,
constant_bytes);
if (rc == FT_TT_OK)
rc = poison_output(&session->noc, output_bytes);
free(constants);
return rc;
}
/* ================================================================
* One device run
* ================================================================ */
/**
* Enqueue ONE descriptor whose program is MAX / none / none, source IN, chain SCALE.
*
* The three program words are overwritten AFTER ft_tt_op_reduce_parameters() has filled the
* shape and address words from the carrier request. Nothing but bytes 0 and 2 of the pass
* word and byte 0 of the final word differ from the router normalise the card already runs.
*/
static bool run_max_reduce(const ft_tt_hardware_session *session, uint32_t rows,
uint32_t reduce_tile_cols, uint32_t input_tile_cols, float *actual,
uint16_t *tiles, size_t *out_poison)
{
const uint32_t out_cols = reduce_tile_cols * TILE_DIM;
const size_t bytes = (size_t)(rows / TILE_DIM) * reduce_tile_cols * TILE_BYTES;
ft_tt_op_reduce_request request;
ft_tt_queue_descriptor descriptor;
uint32_t words[FT_TT_OP_VECTOR_WORDS];
uint32_t parameter_address = 0u;
uint32_t completed = 0u;
char label[160];
int rc;
(void)input_tile_cols;
memset(&request, 0, sizeof(request));
request.function = CARRIER_FUNCTION;
request.row_blocks = rows / TILE_DIM;
request.tile_cols = reduce_tile_cols;
request.prefetch_tiles = reduce_tile_cols;
request.input.x = (uint16_t)g_dram[DRAM_BANK_A].x;
request.input.y = (uint16_t)g_dram[DRAM_BANK_A].y;
request.input.address = DRAM_BUFFER_BASE;
request.input.tile_bytes = TILE_BYTES;
request.constants.x = (uint16_t)g_dram[DRAM_BANK_CONST].x;
request.constants.y = (uint16_t)g_dram[DRAM_BANK_CONST].y;
request.constants.address = DRAM_BUFFER_BASE;
request.constants.tile_bytes = TILE_BYTES;
request.output.x = (uint16_t)g_dram[DRAM_BANK_C].x;
request.output.y = (uint16_t)g_dram[DRAM_BANK_C].y;
request.output.address = DRAM_BUFFER_BASE;
request.output.tile_bytes = TILE_BYTES;
rc = ft_tt_op_reduce_parameters(&request, words);
if (rc == FT_TT_OK) {
words[FT_TT_OP_REDUCE_PASS0] =
(FT_TT_OP_REDUCE_POOL_MAX << (FT_TT_OP_REDUCE_BYTE_POOL * 8u)) |
(FT_TT_OP_REDUCE_MAP_NONE << (FT_TT_OP_REDUCE_BYTE_MAP * 8u)) |
(FT_TT_OP_REDUCE_VERB_NONE << (FT_TT_OP_REDUCE_BYTE_VERB * 8u));
words[FT_TT_OP_REDUCE_PASS1] = 0u;
words[FT_TT_OP_REDUCE_FINAL] =
(1u << (FT_TT_OP_REDUCE_BYTE_PASS_COUNT * 8u)) |
(FT_TT_OP_REDUCE_SOURCE_IN << (FT_TT_OP_REDUCE_BYTE_SOURCE * 8u)) |
(FT_TT_OP_REDUCE_CHAIN_SCALE << (FT_TT_OP_REDUCE_BYTE_CHAIN * 8u));
rc = ft_tt_queue_write_op_parameters(&session->noc, &g_queue, g_slot, words,
&parameter_address);
}
if (rc != FT_TT_OK) {
ft_tt_test_check_fmt("the MAX descriptor is prepared", false, "rc=%d", rc);
return false;
}
memset(&descriptor, 0, sizeof(descriptor));
descriptor.opcode = FT_TT_QUEUE_OP_REDUCE;
descriptor.a0 = parameter_address;
rc = ft_tt_queue_enqueue(&session->noc, &g_queue, &descriptor, 1u);
if (rc == FT_TT_OK)
rc = ft_tt_queue_wait_completed(&session->noc, &g_queue, g_slot + 1u, RUN_TIMEOUT_MS,
&completed);
snprintf(label, sizeof(label), "MAX*scale %ux%u (Wt = %u) completes", rows, out_cols,
reduce_tile_cols);
ft_tt_test_check_fmt(label, rc == FT_TT_OK, "rc=%d completed=%u of %u", rc, completed,
g_slot + 1u);
if (rc != FT_TT_OK)
return false;
g_slot++;
/* DID IT EXECUTE, OR WAS IT REFUSED? An advancing completion count is NOT the same as a
* descriptor that ran. `descriptor_is_executable()` sets kErrBadParameters and
* `ftq_abort()` DRAINS -- every push and pop still happens so the page counters stay
* balanced (resident_reduce_reader.c, "Rule 3") -- so a REFUSED descriptor still retires
* its slot and still lets the writer produce an output tile. The kernel error word and
* the five per-processor status words are the only things that separate the two, and
* without them a wrong answer cannot be attributed to anything. */
{
static const unsigned processors[5] = { FT_TT_PROC_DM0, FT_TT_PROC_DM1,
FT_TT_PROC_MATH0, FT_TT_PROC_MATH1,
FT_TT_PROC_MATH2 };
static const char *names[5] = { "DM0", "DM1", "M0", "M1", "M2" };
uint32_t fields[FT_TT_QUEUE_FIELD_COUNT];
const char *reason = NULL;
unsigned which;
int completion_rc;
(void)ft_tt_queue_read_control(&session->noc, &g_queue, fields);
completion_rc = ft_tt_queue_check_completion(&g_queue, fields, g_slot, &reason);
printf(" control: state=%s error=%s(0x%08X) tail=%u completed=%u check=%s\n",
ft_tt_queue_state_string(fields[FT_TT_QUEUE_FIELD_STATE]),
ft_tt_queue_kernel_error_string(fields[FT_TT_QUEUE_FIELD_ERROR]),
fields[FT_TT_QUEUE_FIELD_ERROR], fields[FT_TT_QUEUE_FIELD_TAIL],
fields[FT_TT_QUEUE_FIELD_COMPLETED_COUNT],
(completion_rc == FT_TT_OK) ? "ok" : (reason ? reason : "?"));
printf(" per-processor:");
for (which = 0; which < 5u; which++) {
uint32_t status[FT_TT_QUEUE_STATUS_WORDS];
if (ft_tt_queue_read_status(&session->noc, &g_queue, processors[which], status) !=
FT_TT_OK) {
printf(" %s=<unread>", names[which]);
continue;
}
printf(" %s=%s/%s", names[which],
ft_tt_queue_state_string(status[FT_TT_QUEUE_STATUS_STATE]),
ft_tt_queue_kernel_error_string(status[FT_TT_QUEUE_STATUS_ERROR]));
}
printf("\n");
}
rc = device_read(&session->noc, g_dram[DRAM_BANK_C], DRAM_BUFFER_BASE, tiles, bytes);
if (rc != FT_TT_OK) {
ft_tt_test_check_fmt("the output reads back", false, "rc=%d", rc);
return false;
}
*out_poison = poison_remaining(tiles, bytes);
/* Printed for EVERY descriptor, not only the ones that are scored: a refused descriptor
* that never wrote its output reads back as pure poison, and that is the difference
* between "the kernel computed this" and "this is what was in DRAM already". */
printf(" output: %zu of %zu bytes still poison\n", *out_poison, bytes);
rc = from_bf16_tiles(tiles, rows, out_cols, actual);
if (rc != FT_TT_OK) {
ft_tt_test_check_fmt("the output untilizes", false, "rc=%d", rc);
return false;
}
return true;
}
/**
* Recover the row maxima the CARD computed.
*
* y[r][c] = x[r][c] * rowmax(r) and the background is 1.0, so column 0 of the output is the
* maximum itself. Divided by the input anyway, so a background that was ever not 1.0 would
* be a wrong number rather than a silently rescaled one.
*/
static void extract_device_max(const float *actual, const float *input, uint32_t rows,
uint32_t out_cols, uint32_t in_cols, float *out)
{
uint32_t row;
for (row = 0; row < rows; row++) {
const float denominator = input[(size_t)row * in_cols];
out[row] = (denominator != 0.0f) ? actual[(size_t)row * out_cols] / denominator : NAN;
}
}
/** Report every row that disagrees, and by how much. A summary that collapses to one
* number cannot say WHICH rows moved, and which rows moved is the whole characterisation. */
static void compare_maxima(const char *label, const float *expected, const float *device,
uint32_t rows, bool expect_pass)
{
uint32_t mismatches = 0;
uint32_t row;
uint32_t first_bad = 0;
double worst = 0.0;
char detail[256];
for (row = 0; row < rows; row++) {
const double difference = fabs((double)device[row] - (double)expected[row]);
if (!(difference <= (double)EXACT_TOLERANCE)) {
if (mismatches == 0u)
first_bad = row;
mismatches++;
if (difference > worst)
worst = difference;
}
}
if (mismatches == 0u)
snprintf(detail, sizeof(detail), "all %u rows exact", rows);
else
snprintf(detail, sizeof(detail),
"%u of %u rows wrong, first row %u: device %.6g, reference %.6g (worst |d| "
"= %.6g)",
mismatches, rows, first_bad, (double)device[first_bad],
(double)expected[first_bad], worst);
ft_tt_test_check_fmt(label, (mismatches == 0u) == expect_pass, "%s", detail);
}
/** The per-row table, printed unconditionally. The verdict is a claim; this is evidence. */
static void print_table(const char *title, const float *device, const float *const *candidates,
const char *const *names, size_t candidate_count, uint32_t rows)
{
uint32_t row;
size_t which;
printf("\n %s\n row | device", title);
for (which = 0; which < candidate_count; which++)
printf(" | %s", names[which]);
printf("\n");
for (row = 0; row < rows; row++) {
printf(" %3u | %6.1f", row, (double)device[row]);
for (which = 0; which < candidate_count; which++)
printf(" | %6.1f", (double)candidates[which][row]);
printf("\n");
}
printf("\n");
}
/* ================================================================
* The cases
* ================================================================ */
/** Case B — the max lives in the FIRST of two tiles. The question, stated as data. */
static const spike g_case_b[] = { { 3u, 100.0f }, { 39u, 40.0f } };
/** Case C — the mirror: the max lives in the SECOND tile. */
static const spike g_case_c[] = { { 3u, 40.0f }, { 39u, 100.0f } };
/** Case D — four tiles, strictly decreasing spikes, so the answer names WHICH tile won. */
static const spike g_case_d[] = {
{ 3u, 100.0f }, { 39u, 40.0f }, { 75u, 30.0f }, { 111u, 20.0f }
};
typedef struct probe_buffers {
float *input;
float *actual;
uint16_t *tiles;
float *device_max;
float *reference_all;
float *reference_first;
float *reference_last;
} probe_buffers;
static void free_buffers(probe_buffers *buffers)
{
free(buffers->input);
free(buffers->actual);
free(buffers->tiles);
free(buffers->device_max);
free(buffers->reference_all);
free(buffers->reference_first);
free(buffers->reference_last);
memset(buffers, 0, sizeof(*buffers));
}
static bool allocate_buffers(probe_buffers *buffers, uint32_t rows, uint32_t max_cols)
{
const size_t count = (size_t)rows * max_cols;
memset(buffers, 0, sizeof(*buffers));
buffers->input = malloc(count * sizeof(float));
buffers->actual = malloc(count * sizeof(float));
buffers->tiles = malloc(count * sizeof(uint16_t));
buffers->device_max = malloc(rows * sizeof(float));
buffers->reference_all = malloc(rows * sizeof(float));
buffers->reference_first = malloc(rows * sizeof(float));
buffers->reference_last = malloc(rows * sizeof(float));
if (!buffers->input || !buffers->actual || !buffers->tiles || !buffers->device_max ||
!buffers->reference_all || !buffers->reference_first || !buffers->reference_last) {
free_buffers(buffers);
return false;
}
return true;
}
/**
* STAGE 1 — the negative control, and it must go RED.
*
* Case C's data (true max in tile 1) uploaded at 64 columns, reduced with `tile_cols = 1`.
* That is a row reduce that only ever saw the FIRST tile — the exact defect this probe is
* hunting, induced by a descriptor. The pair of checks below is what makes a later green
* mean something: the harness must call the 64-wide comparison FAILED and the 32-wide one
* PASSED, off the same device output.
*/
static bool stage_1_negative_control(const ft_tt_hardware_session *session,
probe_buffers *buffers)
{
const uint32_t cols = 64u;
size_t poison = 0;
const float *candidates[2];
const char *names[2] = { "true(64)", "tile0(32)" };
ft_tt_test_step("stage 1 — NEGATIVE CONTROL: reduce ONE tile of a TWO-tile row. The "
"64-wide check MUST fail; if it does not, nothing after it is evidence");
build_input(buffers->input, PROBE_ROWS, cols, g_case_c,
sizeof(g_case_c) / sizeof(g_case_c[0]));
reference_max(buffers->input, PROBE_ROWS, cols, 0u, cols, buffers->reference_all);
reference_max(buffers->input, PROBE_ROWS, cols, 0u, TILE_DIM, buffers->reference_first);
if (upload_operands(session, buffers->input, PROBE_ROWS, cols, buffers->tiles,
(size_t)(PROBE_ROWS / TILE_DIM) * 1u * TILE_BYTES) != FT_TT_OK) {
ft_tt_test_check("the negative control's operands upload", false, "");
return false;
}
if (!run_max_reduce(session, PROBE_ROWS, 1u, cols / TILE_DIM, buffers->actual,
buffers->tiles, &poison))
return false;
/* A handful of surviving poison BYTES is not a kernel that did not run: 0x5A5A is a
* representable bf16 and the answers legitimately contain it. The check is that the
* output is not still POISON, i.e. essentially all of it was overwritten. */
ft_tt_test_check_fmt("the kernel wrote over the poison", poison * 100u < 2048u,
"%zu bytes still poison", poison);
extract_device_max(buffers->actual, buffers->input, PROBE_ROWS, TILE_DIM, cols,
buffers->device_max);
candidates[0] = buffers->reference_all;
candidates[1] = buffers->reference_first;
print_table("stage 1 (Wt = 1 over a 64-wide row)", buffers->device_max, candidates, names,
2u, PROBE_ROWS);
compare_maxima("A ONE-TILE reduce of a TWO-TILE row is REPORTED WRONG (this check must "
"FAIL for the probe to mean anything)",
buffers->reference_all, buffers->device_max, PROBE_ROWS, false);
compare_maxima("and the same output is EXACTLY the first tile's max — the harness reads "
"a real number, not noise",
buffers->reference_first, buffers->device_max, PROBE_ROWS, true);
return true;
}
/** One two-tile or four-tile case, scored against all three candidate answers. */
static bool run_case(const ft_tt_hardware_session *session, probe_buffers *buffers,
const char *title, const spike *spikes, size_t spike_count, uint32_t cols,
const char *verdict_label)
{
const uint32_t tile_cols = cols / TILE_DIM;
const size_t bytes = (size_t)(PROBE_ROWS / TILE_DIM) * tile_cols * TILE_BYTES;
size_t poison = 0;
const float *candidates[3];
const char *names[3] = { "true", "tile0only", "lastonly" };
build_input(buffers->input, PROBE_ROWS, cols, spikes, spike_count);
reference_max(buffers->input, PROBE_ROWS, cols, 0u, cols, buffers->reference_all);
reference_max(buffers->input, PROBE_ROWS, cols, 0u, TILE_DIM, buffers->reference_first);
reference_max(buffers->input, PROBE_ROWS, cols, cols - TILE_DIM, cols,
buffers->reference_last);
if (upload_operands(session, buffers->input, PROBE_ROWS, cols, buffers->tiles, bytes) !=
FT_TT_OK) {
ft_tt_test_check_fmt("the case's operands upload", false, "%s", title);
return false;
}
if (!run_max_reduce(session, PROBE_ROWS, tile_cols, tile_cols, buffers->actual,
buffers->tiles, &poison))
return false;
ft_tt_test_check_fmt("the kernel wrote over the poison", poison * 100u < bytes,
"%zu bytes still poison", poison);
extract_device_max(buffers->actual, buffers->input, PROBE_ROWS, cols, cols,
buffers->device_max);
candidates[0] = buffers->reference_all;
candidates[1] = buffers->reference_first;
candidates[2] = buffers->reference_last;
print_table(title, buffers->device_max, candidates, names, 3u, PROBE_ROWS);
compare_maxima(verdict_label, buffers->reference_all, buffers->device_max, PROBE_ROWS,
true);
return true;
}
/* ================================================================
* Stage 5 — characterisation
* ================================================================ */
/**
* ONE spike, swept over (tile index x in-face column x row width).
*
* Stage 3 came back with a row max that was EXACTLY 64x the right answer while stages 2 and
* 4 were exact, and its case differs from theirs in TWO ways at once — the winning value was
* in a later tile AND at a different column inside its face. Two changes is not a finding.
* These cases move ONE at a time.
*
* A single spike per case, so "which value should have won" has no second answer, and the
* OBSERVED RATIO is printed rather than a pass/fail: the number is the characterisation.
*/
typedef struct sweep_case {
const char *name;
uint32_t cols;
uint32_t spike_column;
} sweep_case;
static const sweep_case g_sweep[] = {
/* Wt = 2: tile 0 vs tile 1, at the SAME in-face column each time. */
{ "Wt=2 spike in tile 0, face col 3", 64u, 3u },
{ "Wt=2 spike in tile 1, face col 3", 64u, 35u },
/* Wt = 2: the same two tiles, at in-face column 7 — stage 3's column. */
{ "Wt=2 spike in tile 0, face col 7", 64u, 7u },
{ "Wt=2 spike in tile 1, face col 7", 64u, 39u },
/* The RIGHT face of a tile (columns 16..31), which no case has touched. */
{ "Wt=2 spike in tile 0, face col 19", 64u, 19u },
{ "Wt=2 spike in tile 1, face col 19", 64u, 51u },
/* Wt = 4: does the factor follow the row width, the tile index, or neither? */
{ "Wt=4 spike in tile 0, face col 7", 128u, 7u },
{ "Wt=4 spike in tile 2, face col 7", 128u, 71u },
{ "Wt=4 spike in tile 3, face col 7", 128u, 103u },
/* Wt = 1: one tile, so no accumulation at all — the control for the sweep. */
{ "Wt=1 spike in tile 0, face col 7", 32u, 7u }
};
#define SWEEP_COUNT (sizeof(g_sweep) / sizeof(g_sweep[0]))
/**
* Run one swept case and print the ratio device/reference, plus the ratio at four OUTPUT
* columns.
*
* The second half matters: y = x * col0, so if the whole row is off by the same factor the
* defect is in the REDUCE (col0 itself is wrong). If only column 0 is off, it is in the pack
* or in the read, and the reduce is fine. One print separates those.
*/
static bool run_sweep_case(const ft_tt_hardware_session *session, probe_buffers *buffers,
const sweep_case *item)
{
const uint32_t cols = item->cols;
const uint32_t tile_cols = cols / TILE_DIM;
const size_t bytes = (size_t)(PROBE_ROWS / TILE_DIM) * tile_cols * TILE_BYTES;
const spike one = { 0u, 100.0f };
spike spikes[1];
size_t poison = 0;
uint32_t row;
double first_ratio = 0.0;
bool uniform = true;
bool exact = true;
spikes[0] = one;
spikes[0].column = item->spike_column;
build_input(buffers->input, PROBE_ROWS, cols, spikes, 1u);
reference_max(buffers->input, PROBE_ROWS, cols, 0u, cols, buffers->reference_all);
if (upload_operands(session, buffers->input, PROBE_ROWS, cols, buffers->tiles, bytes) !=
FT_TT_OK) {
ft_tt_test_check_fmt("the swept case's operands upload", false, "%s", item->name);
return false;
}
if (!run_max_reduce(session, PROBE_ROWS, tile_cols, tile_cols, buffers->actual,
buffers->tiles, &poison))
return false;
extract_device_max(buffers->actual, buffers->input, PROBE_ROWS, cols, cols,
buffers->device_max);
for (row = 0; row < PROBE_ROWS; row++) {
const double ratio = (double)buffers->device_max[row] / (double)buffers->reference_all[row];
if (row == 0u)
first_ratio = ratio;
else if (fabs(ratio - first_ratio) > 1e-3)
uniform = false;
if (fabs((double)buffers->device_max[row] - (double)buffers->reference_all[row]) > 0.0)
exact = false;
}
printf(" %-36s ratio %s%.6g (row 0: device %.6g, reference %.6g)\n", item->name,
uniform ? "= " : "~ ", first_ratio, (double)buffers->device_max[0],
(double)buffers->reference_all[0]);
if (!exact) {
/* y = x * col0. If every column carries the same factor the REDUCE is wrong; if
* only column 0 does, the reduce is right and the pack or the read is not. */
static const uint32_t probe_columns[4] = { 0u, 1u, 16u, 31u };
unsigned which;
printf(" per-output-column y/x at row 0:");
for (which = 0; which < 4u; which++) {
const uint32_t column = probe_columns[which];
printf(" c%u=%.6g", column,
(double)buffers->actual[column] / (double)buffers->input[column]);
}
printf("\n");
}
return true;
}
static void stage_5_characterise(const ft_tt_hardware_session *session, probe_buffers *buffers)
{
unsigned index;
bool all_exact = true;
ft_tt_test_step("stage 5 — characterisation: ONE spike, swept over tile index and "
"in-face column, so the two things stage 3 changed at once are "
"separated");
printf("\n");
for (index = 0; index < SWEEP_COUNT; index++) {
if (!run_sweep_case(session, buffers, &g_sweep[index]))
return;
{
uint32_t row;
for (row = 0; row < PROBE_ROWS; row++) {
if (fabs((double)buffers->device_max[row] -
(double)buffers->reference_all[row]) > 0.0)
all_exact = false;
}
}
}
printf("\n");
ft_tt_test_check("every swept single-spike row max is EXACT", all_exact,
"see the ratio table above for the ones that are not");
}
/* ================================================================
* Stages 6-7 — is the odd case about the REDUCE, or about the RESIDENCY?
* ================================================================ */
/**
* The sweep's shape is not "a later tile loses". Wt = 4 finds a spike in tile 2 and in
* tile 3 exactly; Wt = 1 is exact; only Wt = 2 -- the one width that is LESS than the
* residency's max_tile_cols and still has more than one tile -- gets it wrong. That is a
* statement about the CIRCULAR BUFFERS, which are placed once per residency, and not about
* reduce_tile.
*
* Two runs settle it, and both use the SAME descriptor:
* stage 6 -- the same call three times in a row. Same answer three times means the
* defect is deterministic in the data, not a stale page left by whatever ran
* before it.
* stage 7 -- the same call on a residency placed for max_tile_cols = 2, so Wt EQUALS the
* depth the buffers were placed for. If that is exact, the defect is the
* residency/descriptor width mismatch and reduce_tile is not implicated at
* all.
*/
static void run_probe_case_wide(const ft_tt_hardware_session *session, probe_buffers *buffers,
const char *label, float base, uint32_t tile_cols)
{
const uint32_t cols = tile_cols * TILE_DIM;
const spike one = { (tile_cols > 1u) ? 39u : 7u, base };
const size_t bytes = (size_t)(PROBE_ROWS / TILE_DIM) * tile_cols * TILE_BYTES;
size_t poison = 0;
uint32_t row;
uint32_t wrong = 0;
build_input(buffers->input, PROBE_ROWS, cols, &one, 1u);
reference_max(buffers->input, PROBE_ROWS, cols, 0u, cols, buffers->reference_all);
if (upload_operands(session, buffers->input, PROBE_ROWS, cols, buffers->tiles, bytes) !=
FT_TT_OK) {
ft_tt_test_check_fmt("operands upload", false, "%s", label);
return;
}
if (!run_max_reduce(session, PROBE_ROWS, tile_cols, tile_cols, buffers->actual,
buffers->tiles, &poison))
return;
extract_device_max(buffers->actual, buffers->input, PROBE_ROWS, cols, cols,
buffers->device_max);
printf(" %-30s device rows 0..7:", label);
for (row = 0; row < 8u; row++)
printf(" %.6g", (double)buffers->device_max[row]);
printf(" (reference %.6g..%.6g)\n", (double)buffers->reference_all[0],
(double)buffers->reference_all[7]);
for (row = 0; row < PROBE_ROWS; row++) {
if (buffers->device_max[row] != buffers->reference_all[row])
wrong++;
}
ft_tt_test_check_fmt(label, wrong == 0u, "%u of %u rows wrong", wrong, PROBE_ROWS);
}
static void run_probe_case_valued(const ft_tt_hardware_session *session,
probe_buffers *buffers, const char *label, float base)
{
run_probe_case_wide(session, buffers, label, base, 2u);
}
static void run_probe_case(const ft_tt_hardware_session *session, probe_buffers *buffers,
const char *label)
{
run_probe_case_wide(session, buffers, label, 100.0f, 2u);
}
int main(int argc, char **argv)
{
ft_tt_hardware_session session;
ft_tt_firmware_set firmware;
ft_tt_op_reduce_residency residency;
ft_tt_op_reduce_function carrier = CARRIER_FUNCTION;
probe_buffers buffers;
uint16_t x = 0;
uint16_t y = 0;
uint32_t tensix_index = 0;
uint32_t bank;
int rc;
if (argc < 2) {
fprintf(stderr, "usage: %s <reduce-program-dir>\n", argv[0]);
return 2;
}
ft_tt_test_step("multi-tile row MAX — does a second reduce_tile see the first one's "
"accumulator?");
rc = ft_tt_hardware_session_open(&session);
if (rc != FT_TT_OK)
return 1;
rc = ft_tt_firmware_set_load(ft_tt_firmware_directory(), &firmware);
if (rc != FT_TT_OK) {
ft_tt_hardware_session_close(&session);
return 1;
}
rc = ft_tt_hardware_session_tensix_from_environment(&session, &x, &y, &tensix_index);
if (rc != FT_TT_OK)
goto release;
for (bank = 0; bank < DRAM_BANK_COUNT; bank++) {
rc = ft_tt_coord_dram_bank(&session.grid, bank, FT_TT_COORD_TRANSLATED, &g_dram[bank]);
if (rc != FT_TT_OK) {
ft_tt_test_check_fmt("DRAM bank coordinates derive", false, "bank %u rc=%d", bank,
rc);
goto release;
}
}
rc = ft_tt_program_directory_load(argv[1], TRIAD_MASK, &g_reduce);
if (rc != FT_TT_OK) {
ft_tt_test_check_fmt("the reduce program directory loads", false, "rc=%d", rc);
goto release;
}
rc = ft_tt_launch_core_set_init(&g_group.cores, g_placement_storage, 1u);
if (rc == FT_TT_OK)
rc = ft_tt_launch_core_set_add_tensix(&g_group.cores, &session.grid, tensix_index, NULL);
if (rc != FT_TT_OK) {
ft_tt_test_check_fmt("the core set derives and classifies the target", false,
"index %u rc=%d", tensix_index, rc);
goto release_program;
}
g_group.id = 0u;
g_group.first_tensix_index = tensix_index;
g_group.tensix_index_count = 1u;
g_group.queues = &g_queue;
g_group.resident_processor_mask = TRIAD_MASK;
rc = ft_tt_core_boot_firmware(&session.noc, x, y, &firmware, NULL);
ft_tt_test_check_fmt("firmware boots on the target core", rc == FT_TT_OK,
"index %u -> (%u, %u) rc=%d", tensix_index, x, y, rc);
if (rc != FT_TT_OK)
goto release_program;
if (!allocate_buffers(&buffers, PROBE_ROWS, PROBE_MAX_TILE_COLS * TILE_DIM)) {
ft_tt_test_check("host buffers allocate", false, "out of memory");
goto release_program;
}
/* EVERY VERDICT STAGE GETS A RESIDENCY SIZED TO ITS OWN DESCRIPTOR, which is also what
* every shipped caller does (test_phase6_vector.c places the residency at the shape's
* own tile_cols). A residency wider than the descriptor is refused by
* `descriptor_is_executable()` as soon as the page pointer leaves the descriptor's grid,
* and a refused descriptor does not retire -- so mixing widths on one residency is a
* stuck triad, not a wrong answer. Stages 8-10 explore exactly that and are opt-in. */
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 1u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad starts, placed for Wt <= 1", rc == FT_TT_OK,
"rc=%d", rc);
if (rc != FT_TT_OK)
goto free_host;
if (stage_1_negative_control(&session, &buffers)) {
retire_triad(&session.noc, "the triad retires between widths");
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 2u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad restarts, placed for Wt <= 2", rc == FT_TT_OK,
"rc=%d", rc);
}
if (rc == FT_TT_OK) {
ft_tt_test_step("stage 2 — the question: max in the FIRST of TWO tiles. If the first "
"reduce_tile's accumulator does not survive the second's transpose, "
"this reports ~40+r instead of 100+r");
if (run_case(&session, &buffers, "case B (Wt = 2, max in tile 0)", g_case_b,
sizeof(g_case_b) / sizeof(g_case_b[0]), 64u,
"MULTI-TILE MAX: a max in the FIRST tile survives the SECOND tile's "
"reduce_tile")) {
ft_tt_test_step("stage 3 — the mirror: max in the SECOND tile. Green either way "
"if the defect exists, so its job is to NAME the direction");
if (run_case(&session, &buffers, "case C (Wt = 2, max in tile 1)", g_case_c,
sizeof(g_case_c) / sizeof(g_case_c[0]), 64u,
"and a max in the LAST tile survives too")) {
retire_triad(&session.noc, "the triad retires between widths");
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 4u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad restarts, placed for Wt <= 4",
rc == FT_TT_OK, "rc=%d", rc);
if (rc == FT_TT_OK) {
ft_tt_test_step("stage 4 — depth: four tiles, strictly decreasing spikes, "
"so the reported value NAMES the tile that won");
(void)run_case(&session, &buffers, "case D (Wt = 4, max in tile 0)",
g_case_d, sizeof(g_case_d) / sizeof(g_case_d[0]), 128u,
"and it survives THREE more reduce_tile calls at Wt = 4");
ft_tt_test_step("stage 5 — Wt = 4 with a SINGLE spike, in a tile that is "
"NOT the first: nothing else in the row can supply the "
"answer, so a dropped accumulator shows as the 1.0 "
"background");
printf("\n");
run_probe_case_wide(&session, &buffers, "Wt=4, single spike in tile 1",
100.0f, 4u);
printf("\n");
}
}
}
}
retire_triad(&session.noc, "all five processors retire when ASKED");
if (!diagnostics_enabled()) {
ft_tt_test_step("stages 6-10 (the residency-width diagnostics) are OPT-IN: they send "
"descriptors the kernel correctly REFUSES, and a refused descriptor "
"does not retire, so they leave the triad holding a queue it will "
"never drain. Set FT_PROBE_DIAGNOSTICS=1 to run them");
goto free_host;
}
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 4u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
if (rc == FT_TT_OK)
stage_5_characterise(&session, &buffers);
/* stage 7 — the same descriptor on a residency whose buffers are placed for exactly the
* width the descriptor uses. Everything else is held constant. */
ft_tt_test_step("stage 7 — the SAME Wt = 2 call on a residency placed for "
"max_tile_cols = 2, so the descriptor's width EQUALS the depth the "
"circular buffers were placed for");
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 2u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad restarts, placed for Wt <= 2", rc == FT_TT_OK,
"rc=%d", rc);
if (rc == FT_TT_OK) {
printf("\n");
run_probe_case(&session, &buffers, "Wt=2 on a Wt<=2 residency");
printf("\n");
retire_triad(&session.noc, "and the triad retires again when ASKED");
}
/* stage 8 — name the LAG. Four consecutive Wt = 2 descriptors on a Wt <= 4 residency,
* each with a DIFFERENT spike value. If a wrong run returns a value that was never in
* its own input but WAS in an earlier descriptor's, the defect is a stale circular-
* buffer page and not a reduction of the wrong data. Which earlier descriptor names the
* lag, and the lag is what makes the fix mechanical. */
ft_tt_test_step("stage 8 — four consecutive Wt = 2 descriptors on a Wt <= 4 residency, "
"each with a DIFFERENT maximum: which input does a wrong run return?");
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 4u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad restarts, placed for Wt <= 4", rc == FT_TT_OK,
"rc=%d", rc);
if (rc == FT_TT_OK) {
printf("\n");
run_probe_case_valued(&session, &buffers, "descriptor 1, max 100+r", 100.0f);
run_probe_case_valued(&session, &buffers, "descriptor 2, max 200+r", 200.0f);
run_probe_case_valued(&session, &buffers, "descriptor 3, max 300+r", 300.0f);
run_probe_case_valued(&session, &buffers, "descriptor 4, max 200+r", 200.0f);
printf("\n");
retire_triad(&session.noc, "and the triad retires a third time when ASKED");
}
/* stage 9 — THE PREDICTION.
*
* Stage 8 shows that Wt = 2 descriptors on a Wt <= 4 residency are correct when they
* are all the SAME width; stage 6 shows them alternating once other widths have run.
* So the trigger is a width CHANGE, and the reader says why: it reserves `depth` pages
* and then issues ONE CONTIGUOUS NoC read of `depth * TILE_BYTES` at the write pointer
* (resident_reduce_reader.c, the cb_in block loop). That is only correct while the
* `depth` pages do not WRAP the circular buffer -- and a descriptor of a different
* width leaves the page pointer at an offset that is not a multiple of the next
* descriptor's depth, after which every other block wraps.
*
* Concretely, on a 4-page cb_in: two Wt = 2 descriptors leave the pointer at page 0. A
* Wt = 1 descriptor leaves it at page 1. The next Wt = 2 takes pages 1-2 (contiguous,
* fine); the one after takes pages 3-0, WRAPS, and the single contiguous read lands
* past the end of the buffer instead. So the prediction is: correct, correct, [Wt=1],
* correct, WRONG, correct, WRONG.
*
* If that sequence prints, the defect is the reader's block read and not reduce_tile.
*/
ft_tt_test_step("stage 9 — the PREDICTION: a Wt = 1 descriptor leaves the cb_in page "
"pointer on an odd page, after which every OTHER Wt = 2 block wraps the "
"4-page buffer. Expect: ok, ok, [Wt=1], ok, WRONG, ok, WRONG");
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 4u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad restarts, placed for Wt <= 4", rc == FT_TT_OK,
"rc=%d", rc);
if (rc == FT_TT_OK) {
printf("\n");
run_probe_case_wide(&session, &buffers, "1: Wt=2 (pages 0-1)", 100.0f, 2u);
run_probe_case_wide(&session, &buffers, "2: Wt=2 (pages 2-3)", 200.0f, 2u);
run_probe_case_wide(&session, &buffers, "3: Wt=1 MISALIGNS (page 0)", 100.0f, 1u);
run_probe_case_wide(&session, &buffers, "4: Wt=2 (pages 1-2, no wrap)", 200.0f, 2u);
run_probe_case_wide(&session, &buffers, "5: Wt=2 (pages 3-0, WRAPS)", 100.0f, 2u);
run_probe_case_wide(&session, &buffers, "6: Wt=2 (pages 1-2, no wrap)", 200.0f, 2u);
run_probe_case_wide(&session, &buffers, "7: Wt=2 (pages 3-0, WRAPS)", 100.0f, 2u);
printf("\n");
retire_triad(&session.noc, "and the triad retires a fourth time when ASKED");
}
/* stage 10 — CAN THE GUARD FIRE AT ALL?
*
* Everything above depends on where the cb_in write pointer HAPPENS to be, which is
* history and therefore arguable. This does not. `ft_tensix_cb_block_grid_is_safe()`
* refuses on three terms, and the FIRST -- `fifo_num_pages % chunk_pages != 0` -- needs
* no history at all: place the residency at max_tile_cols = 3 and send a Wt = 2
* descriptor, and 3 % 2 = 1 on the very first descriptor after a fresh launch, pointer
* at the base.
*
* So this is the guard's own red/green, on one residency:
* Wt = 3 and Wt = 1 divide 3 -> accepted, and must compute the right answer;
* Wt = 2 does not -> MUST report kErrBadParameters.
* If the Wt = 2 descriptor comes back with no error, the guard is INERT on this path and
* that is the finding, not the wrap. */
ft_tt_test_step("stage 10 — the GUARD's own red/green: a residency of THREE pages, where "
"Wt=3 and Wt=1 divide the buffer and Wt=2 does not. No pointer history "
"is involved -- three is not a multiple of two, on the first descriptor "
"after launch");
g_slot = 0u;
memset(&residency, 0, sizeof(residency));
rc = ft_tt_op_reduce_residency_for(&carrier, 1u, 3u, TILE_BYTES, &residency);
if (rc == FT_TT_OK)
rc = start_reduce_triad(&session, x, y, &residency);
ft_tt_test_check_fmt("the reduce triad restarts, placed for Wt <= 3", rc == FT_TT_OK,
"rc=%d", rc);
if (rc == FT_TT_OK) {
printf("\n");
run_probe_case_wide(&session, &buffers, "Wt=2 on 3 pages (3%%2!=0, MUST refuse)",
100.0f, 2u);
run_probe_case_wide(&session, &buffers, "Wt=3 on 3 pages (divides, ok)", 200.0f, 3u);
run_probe_case_wide(&session, &buffers, "Wt=1 on 3 pages (divides, ok)", 100.0f, 1u);
printf("\n");
retire_triad(&session.noc, "and the triad retires a fifth time when ASKED");
}
free_host:
free_buffers(&buffers);
release_program:
ft_tt_program_directory_release(&g_reduce);
release:
ft_tt_firmware_set_release(&firmware);
ft_tt_hardware_session_close(&session);
return ft_tt_test_finish();
}
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