opr_opgrad.hip

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/*
 Copyright (c) 2021-2026, The Neko Authors
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     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/
 
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <hip/hip_runtime.h>
#include <device/device_config.h>
#include <device/hip/check.h>
#include "opgrad_kernel.h"
#include "elem_block_tune.h"
 
extern "C" {
  #include <common/neko_log.h>
}
 
template < const int >
int tune_opgrad(void *ux, void *uy, void *uz, void *u,
                void *dx, void *dy, void *dz,
                void *drdx, void *dsdx, void *dtdx,
                void *drdy, void *dsdy, void *dtdy,
                void *drdz, void *dsdz, void *dtdz,
                void *w3, int *nel, int *lx, int *eb_sel, int *ch_sel,
                int *nwf_sel);
 
extern "C" {
 
  void hip_opgrad(void *ux, void *uy, void *uz, void *u,
                   void *dx, void *dy, void *dz,
                   void *drdx, void *dsdx, void *dtdx,
                   void *drdy, void *dsdy, void *dtdy,
                   void *drdz, void *dsdz, void *dtdz,
                   void *w3, int *nel, int *lx) {
 
    static int autotune[19] = { 0 };
    /* elements per block candidate chosen by the tuner */
    static int autotune_eb[19] = { 0 };
    /* chunk candidate chosen for the 1d variant */
    static int autotune_ch[19] = { 0 };
    /* wavefronts per block candidate chosen for the mfma variant */
    static int autotune_nwf[19] = { 0 };
 
    const dim3 nthrds_1d(1024, 1, 1);
    const dim3 nthrds_kstep((*lx), (*lx), 1);
    const dim3 nblcks((*nel), 1, 1);
 
#define CASE_1D(LX, C)                                                          \
    hipLaunchKernelGGL( HIP_KERNEL_NAME(                                        \
                        opgrad_kernel_1d<real, LX, NEKO_CHUNKS(LX, C)> ),       \
                        nblcks, NEKO_CHUNKS_NTHRDS(LX, C), 0,                   \
                        (hipStream_t) glb_cmd_queue,                            \
                        (real *) ux, (real *) uy, (real *) uz, (real *) u,      \
                        (real *) dx, (real *) dy, (real *) dz,                  \
                        (real *) drdx, (real *) dsdx, (real *) dtdx,            \
                        (real *) drdy, (real *) dsdy, (real *) dtdy,            \
                        (real *) drdz, (real *) dsdz, (real *) dtdz,            \
                        (real *) w3);                                           \
    HIP_CHECK(hipGetLastError());
 
/* Runtime dispatch onto the tuned chunk candidate */
#define CASE_1D_SEL(LX, SEL)                                                    \
    switch (SEL) {                                                              \
    case 0:  CASE_1D(LX, 0); break;                                             \
    case 1:  CASE_1D(LX, 1); break;                                             \
    case 2:  CASE_1D(LX, 2); break;                                             \
    default: CASE_1D(LX, 3); break;                                             \
    }
 
 
#define CASE_KSTEP(LX, C)                                                       \
    hipLaunchKernelGGL( HIP_KERNEL_NAME(                                        \
                        opgrad_kernel_kstep<real, LX, NEKO_EB(LX, C)> ),        \
                        NEKO_EB_NBLCKS(*nel, LX, C), NEKO_EB_NTHRDS(LX, C), 0,  \
                        (hipStream_t) glb_cmd_queue,                            \
                        (real *) ux, (real *) uy, (real *) uz, (real *) u,      \
                        (real *) dx, (real *) dy, (real *) dz,                  \
                        (real *) drdx, (real *) dsdx, (real *) dtdx,            \
                        (real *) drdy, (real *) dsdy, (real *) dtdy,            \
                        (real *) drdz, (real *) dsdz, (real *) dtdz,            \
                        (real *) w3, *nel);                                     \
    HIP_CHECK(hipGetLastError());
 
/* Runtime dispatch onto the tuned candidate */
#define CASE_KSTEP_SEL(LX, SEL)                                                 \
    switch (SEL) {                                                              \
    case 0:  CASE_KSTEP(LX, 0); break;                                          \
    case 1:  CASE_KSTEP(LX, 1); break;                                          \
    default: CASE_KSTEP(LX, 2); break;                                          \
    }
 
#define CASE_MFMA(LX, C)                                                        \
    hipLaunchKernelGGL( HIP_KERNEL_NAME(                                        \
                          opgrad_kernel_mfma<real, LX, NEKO_MFMA_NWF(C)> ),     \
                        NEKO_MFMA_NBLCKS(*nel, LX, C), NEKO_MFMA_NTHRDS(C), 0,  \
                        (hipStream_t) glb_cmd_queue,                            \
                        (real *) ux, (real *) uy, (real *) uz, (real *) u,      \
                        (real *) dx, (real *) dy, (real *) dz,                  \
                        (real *) drdx, (real *) dsdx, (real *) dtdx,            \
                        (real *) drdy, (real *) dsdy, (real *) dtdy,            \
                        (real *) drdz, (real *) dsdz, (real *) dtdz,            \
                        (real *) w3, *nel);                                     \
    HIP_CHECK(hipGetLastError());
 
/* Runtime dispatch onto the tuned wavefronts per block candidate */
#define CASE_MFMA_SEL(LX, SEL)                                                  \
    switch (SEL) {                                                              \
    case 0:  CASE_MFMA(LX, 0); break;                                           \
    case 1:  CASE_MFMA(LX, 1); break;                                           \
    case 2:  CASE_MFMA(LX, 2); break;                                           \
    default: CASE_MFMA(LX, 3); break;                                           \
    }
 
#define CASE(LX)                                                                \
    case LX:                                                                    \
      if(autotune[LX] == 0 ) {                                                  \
        autotune[LX]=tune_opgrad<LX>(ux, uy, uz, u,                             \
                                     dx, dy, dz,                                \
                                     drdx, dsdx, dtdx,                          \
                                     drdy, dsdy, dtdy,                          \
                                     drdz, dsdz, dtdz,                          \
                                     w3, nel, lx, &autotune_eb[LX],             \
                                     &autotune_ch[LX],                          \
                                     &autotune_nwf[LX]);                        \
      } else if (autotune[LX] == 1 ) {                                          \
        CASE_1D_SEL(LX, autotune_ch[LX]);                                       \
      } else if (autotune[LX] == 2 ) {                                          \
        CASE_KSTEP_SEL(LX, autotune_eb[LX]);                                    \
      } else if (autotune[LX] == 3 ) {                                          \
        CASE_MFMA_SEL(LX, autotune_nwf[LX]);                                    \
      }                                                                         \
      break
 
    switch(*lx) {
      CASE(2);
      CASE(3);
      CASE(4);
      CASE(5);
      CASE(6);
      CASE(7);
      CASE(8);
      CASE(9);
      CASE(10);
      CASE(11);
      CASE(12);
      CASE(13);
      CASE(14);
      CASE(15);
      CASE(16);
      CASE(17);
      CASE(18);
    default:
      {
        fprintf(stderr, __FILE__ ": size not supported: %d\n", *lx);
        exit(1);
      }
    }
  }
}
 
template < const int LX >
int tune_opgrad(void *ux, void *uy, void *uz, void *u,
                void *dx, void *dy, void *dz,
                void *drdx, void *dsdx, void *dtdx,
                void *drdy, void *dsdy, void *dtdy,
                void *drdz, void *dsdz, void *dtdz,
                void *w3, int *nel, int *lx, int *eb_sel, int *ch_sel,
                int *nwf_sel) {
  hipEvent_t start,stop;
  float time1[NEKO_CHUNKS_CANDIDATES];
  int best1 = 0;
  float time2[NEKO_EB_CANDIDATES];
  float time3[NEKO_MFMA_CANDIDATES];
  int best3 = 0;
  const int rounds = neko_tune_rounds();
  const int iters = neko_tune_iters();
  const int sweep = neko_eb_sweep();
  const bool mfma = mfma_lx_supported<LX>() && hip_have_mfma();
  /* Whether the sweep may pick it on its own, see neko_mfma_sweep() */
  const bool mfma_tune = mfma && neko_mfma_sweep();
  int best = 0;
  int retval;
 
  for (int c = 0; c < NEKO_EB_CANDIDATES; c++) {
    time2[c] = NEKO_TUNE_INIT;
  }
  for (int c = 0; c < NEKO_CHUNKS_CANDIDATES; c++) {
    time1[c] = NEKO_TUNE_INIT;
  }
  for (int c = 0; c < NEKO_MFMA_CANDIDATES; c++) {
    time3[c] = NEKO_TUNE_INIT;
  }
 
  const dim3 nthrds_1d(1024, 1, 1);
  const dim3 nthrds_kstep((*lx), (*lx), 1);
  const dim3 nblcks((*nel), 1, 1);
  const hipStream_t stream = (hipStream_t) glb_cmd_queue;
 
  char *env_value = NULL;
  char neko_log_buf[80];
 
  env_value=getenv("NEKO_AUTOTUNE");
 
  sprintf(neko_log_buf, "Autotune opgrad (lx: %d)", *lx);
  log_section(neko_log_buf);
 
  *eb_sel = 0;
  *ch_sel = 0;
  *nwf_sel = 0;
 
  if(env_value) {
    if( !strcmp(env_value,"1D") ) {
      *ch_sel = neko_chunks_env();
      CASE_1D_SEL(LX, *ch_sel);
      sprintf(neko_log_buf,"Set by env   : 1 (1D, %d chunk)",
              NEKO_CHUNKS_SEL(LX, *ch_sel));
      log_message(neko_log_buf);
      log_end_section();
      return 1;
    } else if( !strcmp(env_value,"KSTEP") ) {
      {
        const int c = neko_eb_env();
        *eb_sel = c;
        CASE_KSTEP_SEL(LX, c);
        sprintf(neko_log_buf,"Set by env   : 2 (KSTEP, %d elem/block)",
                NEKO_EB_SEL(LX, c));
      }
      log_message(neko_log_buf);
      log_end_section();
      return 2;
    } else if( !strcmp(env_value,"MFMA") ) {
      if (mfma) {
        const int c = neko_mfma_env();
        *nwf_sel = c;
        CASE_MFMA_SEL(LX, c);
        sprintf(neko_log_buf,"Set by env   : 3 (MFMA, %d wf, %d elem/block)",
                NEKO_MFMA_NWF(c), NEKO_MFMA_EB(LX, c));
        log_message(neko_log_buf);
        log_end_section();
        return 3;
      } else {
        sprintf(neko_log_buf, "MFMA strategy not available for this config");
        log_error(neko_log_buf);
      }
    } else {
       sprintf(neko_log_buf, "Invalid value set for NEKO_AUTOTUNE");
       log_error(neko_log_buf);
    }
  }
 
  HIP_CHECK(hipEventCreate(&start));
  HIP_CHECK(hipEventCreate(&stop));
 
  /* Warm every variant before timing anything: each specialisation has to be
     resident and the clocks at steady state, or whichever is timed first is
     measured on a colder part */
  for (int i = 0; i < NEKO_TUNE_WARMUP; i++) {
    CASE_1D(LX, 0);
    CASE_1D(LX, 1);
    CASE_1D(LX, 2);
    CASE_1D(LX, 3);
    CASE_KSTEP(LX, 0);
    if (sweep) {
      CASE_KSTEP(LX, 1);
      CASE_KSTEP(LX, 2);
    }
    if (mfma_tune) {
      CASE_MFMA(LX, 0);
      CASE_MFMA(LX, 1);
      CASE_MFMA(LX, 2);
      CASE_MFMA(LX, 3);
    }
  }
 
  /* Interleaved rounds, best time per variant */
  for (int r = 0; r < rounds; r++) {
    NEKO_TUNE_TIME(time1, CASE_1D, LX, 0, iters);
    NEKO_TUNE_TIME(time1, CASE_1D, LX, 1, iters);
    NEKO_TUNE_TIME(time1, CASE_1D, LX, 2, iters);
    NEKO_TUNE_TIME(time1, CASE_1D, LX, 3, iters);
    NEKO_TUNE_TIME(time2, CASE_KSTEP, LX, 0, iters);
    if (sweep) {
      NEKO_TUNE_TIME(time2, CASE_KSTEP, LX, 1, iters);
      NEKO_TUNE_TIME(time2, CASE_KSTEP, LX, 2, iters);
    }
    if (mfma_tune) {
      NEKO_TUNE_TIME(time3, CASE_MFMA, LX, 0, iters);
      NEKO_TUNE_TIME(time3, CASE_MFMA, LX, 1, iters);
      NEKO_TUNE_TIME(time3, CASE_MFMA, LX, 2, iters);
      NEKO_TUNE_TIME(time3, CASE_MFMA, LX, 3, iters);
    }
  }
 
  NEKO_TUNE_LOG(LX, time1, time2);
  NEKO_TUNE_LOG_MFMA(LX, time3);
 
  NEKO_TUNE_BEST(time1, best1, NEKO_CHUNKS_CANDIDATES);
  NEKO_TUNE_BEST(time2, best, NEKO_EB_CANDIDATES);
  NEKO_TUNE_BEST(time3, best3, NEKO_MFMA_CANDIDATES);
  *eb_sel = best;
  *ch_sel = best1;
  *nwf_sel = best3;
 
  if (time1[best1] < time2[best]) {
    retval = 1;
  } else {
    retval = 2;
  }
 
  /* The mfma variant joins the comparison only where it exists, its
     candidates are left at NEKO_TUNE_INIT otherwise */
  if (time3[best3] < ((retval == 1) ? time1[best1] : time2[best])) {
    retval = 3;
  }
 
  /* Leave the chosen kernel's output in place: the tuner stands in for a real
     evaluation and the variants do not sum in the same order */
  if (retval == 1) {
    CASE_1D_SEL(LX, best1);
  } else if (retval == 2) {
    CASE_KSTEP_SEL(LX, best);
  } else {
    CASE_MFMA_SEL(LX, best3);
  }
 
  if (retval == 1) {
    sprintf(neko_log_buf, "Chose        : 1 (1D, %d chunk)",
            NEKO_CHUNKS_SEL(LX, best1));
  } else if (retval == 2) {
    sprintf(neko_log_buf, "Chose        : 2 (KSTEP, %d elem/block)",
            NEKO_EB_SEL(LX, best));
  } else {
    sprintf(neko_log_buf, "Chose        : 3 (MFMA, %d wf, %d elem/block)",
            NEKO_MFMA_NWF(best3), NEKO_MFMA_EB(LX, best3));
  }
  log_message(neko_log_buf);
  log_end_section();
  return retval;
}