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// SPDX-License-Identifier: BSD-3-Clause
/*
* ctaid_probe.cu - CTA-coordinate + engine-read reality probe (r229 revision).
*
* Revisions since the first r229 run:
* - RAWA: the A buffer is copied back D2H through a plain cudaMemcpy BEFORE
* any kernel and printed (first8/last8), so the ground truth "does the
* buffer itself hold i" is on record with no engine involvement.
* - RAWA2: the same readback is repeated AFTER both phases, so a launch
* that corrupts the input buffer would show.
* - Every band prints its raw first 16 values (was 4).
* - Phase 2 is run TWICE (2 and 2b) into two different output buffers and
* both are printed: a first-attempt-only failure is the engine's
* per-launch lottery, not addressing.
*
* Phase 1 coord map : out[(by*16+ty)*256 + (bx*16+tx)] =
* by*10000 + bx*100 + ty*10 + tx
* Phase 2 A-row read: out2[(by*16+ty)*256 + (bx*16+tx)] =
* A[(by*16+ty)*256 + (bx*16+tx)], A[i]=i
*
* Output lines are stable and greppable:
* DEVICE <name> ...
* PTRS d_A=0x... d_out=0x...
* RAWA first8: ... last8: ...
* PROBE1 band=<by> row0: <16 values>
* PROBE1 bad=<count>
* PROBE2 band=<by> row0: <16 values>
* PROBE2 bad=<count>
* PROBE2B band=<by> row0: <16 values>
* PROBE2B bad=<count>
* RAWA2 first8: ... last8: ...
* CTAID-PROBE DONE
*
* Build: nvcc -O2 --cudart=static -arch=sm_75 -o ctaid_probe ctaid_probe.cu
* Run : timeout -k 5 20 /tmp/ctaid_probe
*/
#include <cstdio>
#include <cstdlib>
#include <cstdint>
#include <cuda_runtime.h>
#define CHECK(x) \
do { \
cudaError_t e_ = (x); \
if (e_ != cudaSuccess) { \
printf("CUDA_ERROR %s at line %d\n", \
cudaGetErrorString(e_), __LINE__); \
printf("CTAID-PROBE DONE (FAIL)\n"); \
return 1; \
} \
} while (0)
#define SEQ 64
#define DH 256
#define KK 256
#define TILE 16
__global__ void coord_map(int *out)
{
int row = blockIdx.y * TILE + threadIdx.y;
int col = blockIdx.x * TILE + threadIdx.x;
out[row * DH + col] = blockIdx.y * 10000 + blockIdx.x * 100 +
threadIdx.y * 10 + threadIdx.x;
}
__global__ void arow_read(const int *A, int *out)
{
int row = blockIdx.y * TILE + threadIdx.y;
int col = blockIdx.x * TILE + threadIdx.x;
out[row * DH + col] = A[row * KK + col];
}
static void print_band(const char *tag, const int *h, int by)
{
int base = by * TILE * DH, tx;
printf("%s band=%d row0:", tag, by);
for (tx = 0; tx < 16; tx++)
printf(" %d", h[base + tx]);
printf("\n");
}
static int check_map(const int *h)
{
int bad = 0, row, col;
for (row = 0; row < SEQ; row++)
for (col = 0; col < DH; col++) {
int exp = (row / TILE) * 10000 + (col / TILE) * 100 +
(row % TILE) * 10 + (col % TILE);
if (h[row * DH + col] != exp)
bad++;
}
return bad;
}
static int check_arow(const int *h)
{
int bad = 0, row, col;
for (row = 0; row < SEQ; row++)
for (col = 0; col < DH; col++)
if (h[row * DH + col] != row * KK + col)
bad++;
return bad;
}
int main(void)
{
cudaDeviceProp prop;
const int n = SEQ * DH;
const size_t abytes = (size_t)SEQ * KK * sizeof(int);
const size_t obytes = (size_t)n * sizeof(int);
int *d_out, *d_out2, *d_A;
int *h_out, *h_A;
dim3 grid(DH / TILE, SEQ / TILE); /* (16,4,1) */
dim3 block(TILE, TILE); /* (16,16,1) */
int by;
setvbuf(stdout, NULL, _IONBF, 0);
CHECK(cudaGetDeviceProperties(&prop, 0));
printf("DEVICE %s cc=%d.%d sm=%d mem=%llu\n", prop.name,
prop.major, prop.minor, prop.multiProcessorCount,
(unsigned long long)prop.totalGlobalMem);
h_out = (int *)malloc(obytes);
h_A = (int *)malloc(abytes);
if (!h_out || !h_A)
return 1;
for (by = 0; by < SEQ * KK; by++)
h_A[by] = by;
CHECK(cudaMalloc(&d_out, obytes));
CHECK(cudaMalloc(&d_out2, obytes));
CHECK(cudaMalloc(&d_A, abytes));
printf("PTRS d_A=0x%llx d_out=0x%llx d_out2=0x%llx\n",
(unsigned long long)(uintptr_t)d_A,
(unsigned long long)(uintptr_t)d_out,
(unsigned long long)(uintptr_t)d_out2);
printf("ATAG h_A=0x%llx h_out=0x%llx A=0x%llx out=0x%llx out2=0x%llx\n",
(unsigned long long)(uintptr_t)h_A,
(unsigned long long)(uintptr_t)h_out,
(unsigned long long)(uintptr_t)d_A,
(unsigned long long)(uintptr_t)d_out,
(unsigned long long)(uintptr_t)d_out2);
/* Ground truth: upload A, read it straight back with no kernel. */
printf("ATAG phase=RAWA src=A dst=h_out buf=A\n");
CHECK(cudaMemcpy(d_A, h_A, abytes, cudaMemcpyHostToDevice));
CHECK(cudaMemcpy(h_out, d_A, abytes, cudaMemcpyDeviceToHost));
printf("RAWA first8: %d %d %d %d %d %d %d %d last8: %d %d %d %d %d %d %d %d\n",
h_out[0], h_out[1], h_out[2], h_out[3], h_out[4], h_out[5],
h_out[6], h_out[7], h_out[16376], h_out[16377], h_out[16378],
h_out[16379], h_out[16380], h_out[16381], h_out[16382],
h_out[16383]);
/* ---- Phase 1: CTA coordinate map ---- */
printf("ATAG phase=PROBE1 src=out dst=h_out buf=out\n");
CHECK(cudaMemset(d_out, 0, obytes));
coord_map<<<grid, block>>>(d_out);
CHECK(cudaGetLastError());
CHECK(cudaDeviceSynchronize());
CHECK(cudaMemcpy(h_out, d_out, obytes, cudaMemcpyDeviceToHost));
for (by = 0; by < SEQ / TILE; by++)
print_band("PROBE1", h_out, by);
printf("PROBE1 bad=%d\n", check_map(h_out));
/* ---- Phase 2: A read, first attempt ---- */
printf("ATAG phase=PROBE2 src=A dst=h_out buf=out\n");
CHECK(cudaMemset(d_out, 0, obytes));
arow_read<<<grid, block>>>(d_A, d_out);
CHECK(cudaGetLastError());
CHECK(cudaDeviceSynchronize());
CHECK(cudaMemcpy(h_out, d_out, obytes, cudaMemcpyDeviceToHost));
for (by = 0; by < SEQ / TILE; by++)
print_band("PROBE2", h_out, by);
printf("PROBE2 bad=%d\n", check_arow(h_out));
/* ---- Phase 2b: A read, second attempt, fresh output buffer ---- */
printf("ATAG phase=PROBE2B src=A dst=h_out buf=out2\n");
CHECK(cudaMemset(d_out2, 0, obytes));
arow_read<<<grid, block>>>(d_A, d_out2);
CHECK(cudaGetLastError());
CHECK(cudaDeviceSynchronize());
CHECK(cudaMemcpy(h_out, d_out2, obytes, cudaMemcpyDeviceToHost));
for (by = 0; by < SEQ / TILE; by++)
print_band("PROBE2B", h_out, by);
printf("PROBE2B bad=%d\n", check_arow(h_out));
/* Post-launch A integrity (did any launch corrupt the input?). */
printf("ATAG phase=RAWA2 src=A dst=h_out buf=A\n");
CHECK(cudaMemcpy(h_out, d_A, abytes, cudaMemcpyDeviceToHost));
printf("RAWA2 first8: %d %d %d %d %d %d %d %d last8: %d %d %d %d %d %d %d %d\n",
h_out[0], h_out[1], h_out[2], h_out[3], h_out[4], h_out[5],
h_out[6], h_out[7], h_out[16376], h_out[16377], h_out[16378],
h_out[16379], h_out[16380], h_out[16381], h_out[16382],
h_out[16383]);
printf("CTAID-PROBE DONE\n");
CHECK(cudaFree(d_out));
CHECK(cudaFree(d_out2));
CHECK(cudaFree(d_A));
free(h_out);
free(h_A);
return 0;
}
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