#include "common.cuh"
#include "fattn-common.cuh"
#include "fattn-wmma-f16.cuh"

// nbatch_fa == number of KQ rows to process per iteration
// nbatch_K == number of K columns to load in parallel for KQ calculation

// TODO optimize kernel parameters for FP16 NVIDIA (P100)
// TODO optimize kernel parameters for head sizes 40, 72, 80, 96, 112

// The ROCm compiler cannot handle templating in __launch_bounds__.
// As a workaround, define a macro to package the kernel parameters as uint32_t:
#define GGML_CUDA_FATTN_TILE_CONFIG_CASE(DKQ_, DV_, ncols_, nthreads, occupancy, nbatch_fa, nbatch_K) \
    if (DKQ == (DKQ_) && DV == (DV_) && ncols == (ncols_)) {                                          \
        static_assert((nthreads)          <= 512, "bad nthreads");                                    \
        static_assert((occupancy)         <=   8, "bad occupancy");                                   \
        static_assert((nbatch_fa)         <= 256, "bad nbatch_fa");                                   \
        static_assert((nbatch_K)          <= 256, "bad nbatch_K");                                    \
        return ((nthreads) << 0) | ((occupancy) << 10) | ((nbatch_fa) << 14) | ((nbatch_K) << 23);    \
    }                                                                                                 \

static constexpr __host__ __device__ uint32_t ggml_cuda_fattn_tile_get_config_nvidia_fp16(const int DKQ, const int DV, const int ncols) {
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  2,  64, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  4, 128, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  8, 256, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 16, 256, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 32, 256, 2,  64,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  2,  64, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  4, 128, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  8, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 16, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 32, 256, 2,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  2,  64, 2,  64,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  4, 128, 2,  64,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  8, 256, 2,  64,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 16, 256, 2,  64,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 32, 256, 2,  64,  72)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  2,  64, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  4, 128, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  8, 256, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 16, 256, 2,  64,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 32, 256, 2,  64,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  2,  64, 2,  64,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  4, 128, 2,  64,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  8, 256, 2,  64,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 16, 256, 2,  64,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 32, 256, 2,  64,  48)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  2,  64, 2,  64,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  4, 128, 2,  64,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  8, 256, 2,  64,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 16, 256, 2,  64,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 32, 256, 2,  64,  56)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  2,  64, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  4, 128, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  8, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 16, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 32, 256, 2,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  2,  64, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  4, 128, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  8, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 16, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 32, 256, 2,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(576, 512, 16, 256, 2,  64,  64)

    return 0;
}

static constexpr __host__ __device__ uint32_t ggml_cuda_fattn_tile_get_config_nvidia_fp32(const int DKQ, const int DV, const int ncols) {
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  2,  64, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  4, 128, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  8, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 16, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 32, 256, 2,  32,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  2, 128, 3,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  4, 128, 3,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  8, 128, 3,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 16, 128, 3,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 32, 256, 2,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  2,  64, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  4, 128, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  8, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 16, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 32, 256, 2,  32,  72)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  2,  64, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  4, 128, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  8, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 16, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 32, 256, 2,  32,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  2,  64, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  4, 128, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  8, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 16, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 32, 256, 2,  32,  48)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  2,  64, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  4, 128, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  8, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 16, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 32, 256, 2,  32,  56)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  2, 128, 3,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  4, 128, 3,  32, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  8, 128, 3,  64, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 16, 128, 3,  32, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 32, 256, 2,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  2, 128, 3,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  4, 128, 3,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  8, 256, 2,  32, 256)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 16, 256, 2,  32, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 32, 256, 2,  32,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(576, 512, 16, 256, 2,  32,  64)

    return 0;
}

static constexpr __host__ __device__ uint32_t ggml_cuda_fattn_tile_get_config_amd(const int DKQ, const int DV, const int ncols) {
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  2,  64, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  4, 128, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  8, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 16, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 32, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 64, 256, 2,  32,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  2,  64, 3,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  4, 128, 3,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  8, 128, 2,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 16, 256, 2, 128,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 32, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 64, 256, 2,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  2,  64, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  4, 128, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  8, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 16, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 32, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 64, 256, 2,  32,  72)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  2,  64, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  4, 128, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  8, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 16, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 32, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 64, 256, 2,  32,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  2,  64, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  4, 128, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  8, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 16, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 32, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 64, 256, 2,  32,  48)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  2,  64, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  4, 128, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  8, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 16, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 32, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 64, 256, 2,  32,  56)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  2, 256, 2, 128,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  4, 128, 2,  64, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  8, 256, 2,  64, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 16, 256, 2,  64, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 32, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 64, 256, 2,  64,  32)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  2, 256, 2, 128,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  4, 256, 2,  64, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  8, 256, 2,  64, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 16, 256, 2,  32, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 32, 256, 2,  32, 128)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(576, 512, 16, 256, 2,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(576, 512, 32, 512, 1, 128,  64)

    return 0;
}

static constexpr __host__ __device__ uint32_t ggml_cuda_fattn_tile_get_config_amd_rdna(const int DKQ, const int DV, const int ncols) {
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  2,  64, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  4, 128, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40,  8, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 16, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 32, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 40,  40, 64, 256, 2,  32,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  2,  64, 8,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  4,  64, 8,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64,  8, 128, 5, 128,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 16, 128, 5, 128,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 32, 128, 4,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 64,  64, 64, 128, 5,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  2,  64, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  4, 128, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72,  8, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 16, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 32, 256, 2,  32,  72)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 72,  72, 64, 256, 2,  32,  72)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  2,  64, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  4, 128, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80,  8, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 16, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 32, 256, 2,  32,  40)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 80,  80, 64, 256, 2,  32,  40)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  2,  64, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  4, 128, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96,  8, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 16, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 32, 256, 2,  32,  48)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE( 96,  96, 64, 256, 2,  32,  48)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  2,  64, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  4, 128, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112,  8, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 16, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 32, 256, 2,  32,  56)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(112, 112, 64, 256, 2,  32,  56)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  2,  64, 8,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  4, 128, 8,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128,  8, 128, 8,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 16, 256, 3, 128, 128)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 32, 256, 3, 128,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(128, 128, 64, 256, 3,  64,  64)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  2,  64, 8,  32,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  4, 128, 6,  32, 256)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256,  8, 128, 6,  32, 256)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 16, 256, 5,  32, 256)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(256, 256, 32, 256, 3,  64, 128)

    GGML_CUDA_FATTN_TILE_CONFIG_CASE(576, 512, 16, 256, 4,  64,  64)
    GGML_CUDA_FATTN_TILE_CONFIG_CASE(576, 512, 32, 256, 2, 128,  64)

    return 0;
}

static __host__ uint32_t ggml_cuda_fattn_tile_get_config(const int DKQ, const int DV, const int ncols, const int cc) {
    if (GGML_CUDA_CC_IS_AMD(cc)) {
        if (GGML_CUDA_CC_IS_RDNA(cc)) {
            return ggml_cuda_fattn_tile_get_config_amd_rdna(DKQ, DV, ncols);
        }
        return ggml_cuda_fattn_tile_get_config_amd(DKQ, DV, ncols);
    }
    if (fast_fp16_available(cc)) {
        return ggml_cuda_fattn_tile_get_config_nvidia_fp16(DKQ, DV, ncols);
    }
    return ggml_cuda_fattn_tile_get_config_nvidia_fp32(DKQ, DV, ncols);
}

static constexpr __device__ uint32_t ggml_cuda_fattn_tile_get_config(const int DKQ, const int DV, const int ncols) {
#ifdef GGML_USE_HIP
#ifdef RDNA
    return ggml_cuda_fattn_tile_get_config_amd_rdna(DKQ, DV, ncols);
#else
    return ggml_cuda_fattn_tile_get_config_amd(DKQ, DV, ncols);
#endif // RDNA
#else
#ifdef FAST_FP16_AVAILABLE
    return ggml_cuda_fattn_tile_get_config_nvidia_fp16(DKQ, DV, ncols);
#else
    return ggml_cuda_fattn_tile_get_config_nvidia_fp32(DKQ, DV, ncols);
#endif // FAST_FP16_AVAILABLE
#endif // GGML_USE_HIP
}

static __host__ int ggml_cuda_fattn_tile_get_nthreads(const int DKQ, const int DV, const int ncols, const int cc) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols, cc) >> 0) & ((1 << 10) - 1);
}

static constexpr __device__ int ggml_cuda_fattn_tile_get_nthreads(const int DKQ, const int DV, const int ncols) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols) >> 0) & ((1 << 10) - 1);
}

static __host__ int ggml_cuda_fattn_tile_get_occupancy(const int DKQ, const int DV, const int ncols, const int cc) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols, cc) >> 10) & ((1 << 4) - 1);
}

static constexpr __device__ int ggml_cuda_fattn_tile_get_occupancy(const int DKQ, const int DV, const int ncols) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols) >> 10) & ((1 << 4) - 1);
}

static __host__ int ggml_cuda_fattn_tile_get_nbatch_fa(const int DKQ, const int DV, const int ncols, const int cc) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols, cc) >> 14) & ((1 << 9) - 1);
}

static constexpr __device__ int ggml_cuda_fattn_tile_get_nbatch_fa(const int DKQ, const int DV, const int ncols) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols) >> 14) & ((1 << 9) - 1);
}

static __host__ int ggml_cuda_fattn_tile_get_nbatch_K(const int DKQ, const int DV, const int ncols, const int cc) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols, cc) >> 23) & ((1 << 9) - 1);
}

static constexpr __device__ int ggml_cuda_fattn_tile_get_nbatch_K(const int DKQ, const int DV, const int ncols) {
    return (ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols) >> 23) & ((1 << 9) - 1);
}

// TODO: deduplicate with mma-f16
template<int warp_size, int nwarps, int I, int J, int J_padding, bool oob_check>
static __device__ __forceinline__ void flash_attn_tile_load_tile(
        const half2 * const __restrict__ KV, half2 * const __restrict__ tile_KV, const int stride_KV, const int i_sup) {
    constexpr int cpy_nb = ggml_cuda_get_max_cpy_bytes();
    constexpr int cpy_ne = cpy_nb / 4;

    auto load = [&] __device__ (const int n) {
        const int stride_j = warp_size >> n;

        if (stride_j == 0) {
            return;
        }

        const int j0_start = stride_j == warp_size ? 0 : ((J/2)/cpy_ne) - ((J/2)/cpy_ne) % (2*stride_j);
        const int j0_stop  =                             ((J/2)/cpy_ne) - ((J/2)/cpy_ne) % (1*stride_j);
        const int stride_i = warp_size / stride_j;

        if (j0_start == j0_stop) {
            return;
        }

#pragma unroll
        for (int i0 = 0; i0 < I; i0 += nwarps*stride_i) {
            const int i = i0 + threadIdx.y*stride_i + (stride_j == warp_size ? 0 : threadIdx.x / stride_j);

            if (i0 + nwarps*stride_i <= I || i < I) {
#pragma unroll
                for (int j0 = j0_start; j0 < j0_stop; j0 += stride_j) {
                    const int j = j0*cpy_ne + (stride_j == warp_size ? threadIdx.x : threadIdx.x % stride_j)*cpy_ne;

                    const half2 zero[cpy_ne] = {{0.0f, 0.0f}};
                    ggml_cuda_memcpy_1<cpy_nb>(
                        tile_KV + i*(J/2 + J_padding) + j,
                        !oob_check || i < i_sup ? KV + i*stride_KV + j : zero);
                }
            }
        }
    };
    // 1: max 64*16=512 bytes, 512 half
    // 2: max 32*16=512 bytes, 256 half
    // 3: max 16*16=256 bytes, 128 half
    // 4: max  8*16=128 bytes,  64 half
    // 5: max  4*16= 64 bytes,  32 half
    // 6: max  2*16= 32 bytes,  16 half
    // 7: max  1*16= 16 bytes,   8 half
    static_assert(J % 8 == 0, "bad J");
    static_assert((J/2) % cpy_ne == 0, "bad J");
    ggml_cuda_unroll<7>{}(load);
}

template<int warp_size, int nwarps, int I, int J, int J_padding, bool oob_check>
static __device__ __forceinline__ void flash_attn_tile_load_tile(
        const half2 * const __restrict__ KV, float * const __restrict__ tile_KV, const int stride_KV, const int i_sup) {
    constexpr int cpy_nb = ggml_cuda_get_max_cpy_bytes();
    constexpr int cpy_ne = cpy_nb / 4;

    auto load = [&] __device__ (const int n) {
        const int stride_j = warp_size >> n;

        if (stride_j == 0) {
            return;
        }

        const int j0_start = stride_j == warp_size ? 0 : (J/cpy_ne) - (J/cpy_ne) % (2*stride_j);
        const int j0_stop  =                             (J/cpy_ne) - (J/cpy_ne) % (1*stride_j);
        const int stride_i = warp_size / stride_j;

        if (j0_start == j0_stop) {
            return;
        }

#pragma unroll
        for (int i0 = 0; i0 < I; i0 += nwarps*stride_i) {
            const int i = i0 + threadIdx.y*stride_i + (stride_j == warp_size ? 0 : threadIdx.x / stride_j);

            if (i0 + nwarps*stride_i <= I || i < I) {
#pragma unroll
                for (int j0 = j0_start; j0 < j0_stop; j0 += stride_j) {
                    const int j = j0*(cpy_ne/2) + (stride_j == warp_size ? threadIdx.x : threadIdx.x % stride_j)*(cpy_ne/2);

                    const half2 zero[cpy_ne/2] = {{0.0f, 0.0f}};
                    half2 tmp_h2[cpy_ne/2];
                    ggml_cuda_memcpy_1<sizeof(tmp_h2)>(
                        tmp_h2, !oob_check || i < i_sup ? KV + i*stride_KV + j : zero);

                    float2 tmp_f2[cpy_ne/2];
#pragma unroll
                    for (int l = 0; l < cpy_ne/2; ++l) {
                        tmp_f2[l] = __half22float2(tmp_h2[l]);
                    }
                    ggml_cuda_memcpy_1<sizeof(tmp_f2)>(tile_KV + i*(J + J_padding) + 2*j, tmp_f2);
                }
            }
        }
    };
    // 1: max 32*16=512 bytes, 128 float
    // 2: max 16*16=256 bytes,  64 float
    // 3: max  8*16=128 bytes,  32 float
    // 4: max  4*16= 64 bytes,  16 float
    // 5: max  2*16= 32 bytes,   8 float
    static_assert(J % 8 == 0, "bad J");
    static_assert(J % cpy_ne == 0, "bad J");
    ggml_cuda_unroll<5>{}(load);
}

// Function that performs a single iteration in for the KQ matrix multiplication:
template <int warp_size, int nwarps, int ncols1, int ncols2, int DKQ, int nbatch_fa, int nbatch_K,
    bool use_logit_softcap, bool oob_check, typename T_vec_dot>
static __device__ __forceinline__ void flash_attn_tile_iter_KQ(
        T_vec_dot   * const Q_tmp,
        const half2 * const __restrict__ K_h2,
        T_vec_dot   * const KV_tmp,
        const int stride_K2,
        const int k_VKQ_0,
        const int k_VKQ_sup,
        const int k_KQ_0,
        float * KQ_acc) {
    constexpr int cpy_nb = ggml_cuda_get_max_cpy_bytes();
    constexpr int cpy_ne = cpy_nb / 4;

    constexpr int ncols = ncols1*ncols2;
    constexpr int cpw   = ncols > nwarps ? ncols/nwarps : 1; // Q columns per warp
    constexpr int np    = nwarps > ncols ? nwarps/ncols : 1; // number of parallel warps per Q column

    flash_attn_tile_load_tile<warp_size, nwarps, nbatch_fa, nbatch_K, cpy_ne, oob_check>
        (K_h2 + int64_t(k_VKQ_0)*stride_K2 + k_KQ_0/2, KV_tmp, stride_K2, k_VKQ_sup);
    __syncthreads();

#ifdef FAST_FP16_AVAILABLE
    static_assert((nbatch_K/2) % cpy_ne == 0, "bad nbatch_K");
#pragma unroll
    for (int k_KQ_1 = 0; k_KQ_1 < nbatch_K/2; k_KQ_1 += cpy_ne) {
        half2 K_k[nbatch_fa/(np*warp_size)][cpy_ne];
        half2 Q_k[cpw][cpy_ne];
#else
    static_assert(nbatch_K % cpy_ne == 0, "bad nbatch_K");
#pragma unroll
    for (int k_KQ_1 = 0; k_KQ_1 < nbatch_K; k_KQ_1 += cpy_ne) {
        float K_k[nbatch_fa/(np*warp_size)][cpy_ne];
        float Q_k[cpw][cpy_ne];
#endif // FAST_FP16_AVAILABLE

#pragma unroll
        for (int i_KQ_0 = 0; i_KQ_0 < nbatch_fa; i_KQ_0 += np*warp_size) {
            const int i_KQ = i_KQ_0 + (threadIdx.y % np)*warp_size + threadIdx.x;

#ifdef FAST_FP16_AVAILABLE
            ggml_cuda_memcpy_1<cpy_nb>(&K_k[i_KQ_0/(np*warp_size)], &KV_tmp[i_KQ*(nbatch_K/2 + cpy_ne) + k_KQ_1]);
#else
            ggml_cuda_memcpy_1<cpy_nb>(&K_k[i_KQ_0/(np*warp_size)], &KV_tmp[i_KQ*(nbatch_K   + cpy_ne) + k_KQ_1]);
#endif // FAST_FP16_AVAILABLE
        }
#pragma unroll
        for (int jc0 = 0; jc0 < cpw; ++jc0) {
            const int jc = jc0 + (threadIdx.y / np)*cpw;

#ifdef FAST_FP16_AVAILABLE
            ggml_cuda_memcpy_1<cpy_nb>(&Q_k[jc0], &Q_tmp[jc*(DKQ/2) + k_KQ_0/2 + k_KQ_1]);
#else
            ggml_cuda_memcpy_1<cpy_nb>(&Q_k[jc0], &Q_tmp[jc* DKQ    + k_KQ_0   + k_KQ_1]);
#endif // FAST_FP16_AVAILABLE
        }

#pragma unroll
        for (int i_KQ_0 = 0; i_KQ_0 < nbatch_fa; i_KQ_0 += np*warp_size) {
#pragma unroll
            for (int jc0 = 0; jc0 < cpw; ++jc0) {
#pragma unroll
                for (int k = 0; k < cpy_ne; ++k) {
                    ggml_cuda_mad(KQ_acc[i_KQ_0/(np*warp_size)*cpw + jc0], K_k[i_KQ_0/(np*warp_size)][k], Q_k[jc0][k]);
                }
            }
        }
    }

    if (k_KQ_0 + nbatch_K < DKQ) {
        __syncthreads(); // Sync not needed on last iteration.
    }
}

// Function that performs a single iteration of the main loop over up to nbatch_fa tokens.
template <int warp_size, int nwarps, int ncols1, int ncols2, int DKQ, int DV, int nbatch_fa, int nbatch_K,
    bool use_logit_softcap, bool oob_check, typename T_vec_dot, typename T_KQ, typename T_acc>
static __device__ __forceinline__ void flash_attn_tile_iter(
        T_vec_dot * const Q_tmp,
        const half2 * const __restrict__ K_h2,
        const half2 * const __restrict__ V_h2,
        const half  * const __restrict__ mask,
        const float logit_softcap,
        const float slope,
        T_KQ      * const KQ,
        T_vec_dot * const KV_tmp,
        const int stride_K2,
        const int stride_V2,
        const int stride_mask,
        float * const KQ_max,
        float * const KQ_sum,
        T_acc * const VKQ,
        const int k_VKQ_0,
        const int k_VKQ_max) {
    constexpr int cpy_nb = ggml_cuda_get_max_cpy_bytes();
    constexpr int cpy_ne = cpy_nb / 4;

    constexpr int ncols = ncols1*ncols2;
    constexpr int cpw   = ncols > nwarps ? ncols/nwarps : 1; // Q columns per warp
    constexpr int np    = nwarps > ncols ? nwarps/ncols : 1; // number of parallel warps per Q column

    constexpr int DVp = (DV + 2*warp_size - 1) & ~(2*warp_size - 1); // DV padded to multiple of 2*warp_size.

    // KQ_cs == KQ chunk size, number of KQ values in j direction to store as one contiguous chunk in memory.
    // KQ is originally 2D but uses a Z-shaped 3D memory pattern like KQ[ncols/KQ_cs][DVp][KQ_cs].
#ifdef FAST_FP16_AVAILABLE
    constexpr int KQ_cs = cpw < 2*cpy_ne ? cpw : 2*cpy_ne;
#else
    constexpr int KQ_cs = cpw < 1*cpy_ne ? cpw : 1*cpy_ne;
#endif // FAST_FP16_AVAILABLE
    static_assert(cpw % KQ_cs == 0, "bad KQ_cs");
    const int k_VKQ_sup = k_VKQ_max - k_VKQ_0; // k supremum, only smaller k values have valid KV data

    float KQ_max_new[cpw];
#pragma unroll
    for (int jc0 = 0; jc0 < cpw; ++jc0) {
        KQ_max_new[jc0] = KQ_max[jc0];
    }

    float KQ_acc[nbatch_fa/(np*warp_size) * cpw] = {0.0f}; // Accumulators for KQ matrix multiplication.

    // KQ = K @ Q matrix multiplication:
    constexpr int nbatch_K_last = DKQ % nbatch_K;
#pragma unroll
    for (int k_KQ_0 = 0; k_KQ_0 < DKQ - nbatch_K_last; k_KQ_0 += nbatch_K) {
        flash_attn_tile_iter_KQ<warp_size, nwarps, ncols1, ncols2, DKQ, nbatch_fa, nbatch_K, use_logit_softcap, oob_check>(
            Q_tmp, K_h2, KV_tmp, stride_K2, k_VKQ_0, k_VKQ_sup, k_KQ_0, KQ_acc);
    }
    if (nbatch_K_last > 0) {
        constexpr int k_KQ_0 = DKQ - nbatch_K_last;
        flash_attn_tile_iter_KQ<warp_size, nwarps, ncols1, ncols2, DKQ, nbatch_fa, nbatch_K_last, use_logit_softcap, oob_check>(
            Q_tmp, K_h2, KV_tmp, stride_K2, k_VKQ_0, k_VKQ_sup, k_KQ_0, KQ_acc);
    }

    // Apply logit softcap + mask, update KQ_max:
#pragma unroll
    for (int jc0 = 0; jc0 < cpw; ++jc0) {
        const int j = (jc0 + (threadIdx.y / np)*cpw)/ncols2;

#pragma unroll
        for (int i_KQ_0 = 0; i_KQ_0 < nbatch_fa; i_KQ_0 += np*warp_size) {
            const int i_KQ = i_KQ_0 + (threadIdx.y % np)*warp_size + threadIdx.x;

            if (use_logit_softcap) {
                KQ_acc[(i_KQ_0/(np*warp_size))*cpw + jc0] = logit_softcap * tanhf(KQ_acc[(i_KQ_0/(np*warp_size))*cpw + jc0]);
            }

            if (!oob_check || i_KQ < k_VKQ_sup) {
                KQ_acc[(i_KQ_0/(np*warp_size))*cpw + jc0] += (ncols2 > 1 || mask) ?
                    slope*__half2float(mask[j*stride_mask + k_VKQ_0 + i_KQ]) : 0.0f;

                KQ_max_new[jc0] = fmaxf(KQ_max_new[jc0], KQ_acc[(i_KQ_0/(np*warp_size))*cpw + jc0]);
            }
        }

        KQ_max_new[jc0] = warp_reduce_max<warp_size>(KQ_max_new[jc0]);
    }

    if constexpr (np == 1) {
        __syncthreads();
    } else {
        static_assert(cpw == 1, "bad cpw");
        __shared__ float KQ_max_new_shared[nwarps];
        if (threadIdx.x == 0) {
            KQ_max_new_shared[threadIdx.y] = KQ_max_new[0];
        }
        __syncthreads();
        KQ_max_new[0] = KQ_max_new_shared[(threadIdx.y & ~(np-1)) + threadIdx.x % np];
        KQ_max_new[0] = warp_reduce_max<np>(KQ_max_new[0]);
    }

    // Calculate KQ softmax, write to shared KQ buffer, re-scale VKQ accumulators:
#pragma unroll
    for (int jc0 = 0; jc0 < cpw; jc0 += KQ_cs) {
#ifdef FAST_FP16_AVAILABLE
        half  tmp[nbatch_fa/(np*warp_size)][KQ_cs];
#else
        float tmp[nbatch_fa/(np*warp_size)][KQ_cs];
#endif // FAST_FP16_AVAILABLE

#pragma unroll
        for (int jc1 = 0; jc1 < KQ_cs; ++jc1) {
            const int jc = jc0 + jc1;

            const float KQ_max_scale = expf(KQ_max[jc] - KQ_max_new[jc]);
            KQ_max[jc] = KQ_max_new[jc];

            float KQ_sum_add = 0.0f;
#pragma unroll
            for (int i0 = 0; i0 < nbatch_fa; i0 += np*warp_size) {
                const float val = !oob_check || i0 + (threadIdx.y % np)*warp_size + threadIdx.x < static_cast<uint32_t>(k_VKQ_sup) ?
                    expf(KQ_acc[(i0/(np*warp_size))*cpw + jc] - KQ_max[jc]) : 0.0f;
                KQ_sum_add += val;
                tmp[i0/(np*warp_size)][jc1] = val;
            }
            KQ_sum[jc] = KQ_sum[jc]*KQ_max_scale + KQ_sum_add;

#ifdef FAST_FP16_AVAILABLE
            const half2 KQ_max_scale_h2 = make_half2(KQ_max_scale, KQ_max_scale);
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size) {
                VKQ[jc*((DVp/2)/warp_size) + i0/warp_size] *= KQ_max_scale_h2;
            }
#else
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size) {
                VKQ[jc*((DVp/2)/warp_size) + i0/warp_size].x *= KQ_max_scale;
                VKQ[jc*((DVp/2)/warp_size) + i0/warp_size].y *= KQ_max_scale;
            }
#endif // FAST_FP16_AVAILABLE
        }

#pragma unroll
        for (int i0 = 0; i0 < nbatch_fa; i0 += np*warp_size) {
            const int i = i0 + (threadIdx.y % np)*warp_size + threadIdx.x;

            ggml_cuda_memcpy_1<sizeof(tmp[0])>(
                KQ + (jc0/KQ_cs + (threadIdx.y / np)*(cpw/KQ_cs))*(nbatch_fa*KQ_cs) + i*KQ_cs,
                tmp[i0/(np*warp_size)]);
        }
    }

    // VKQ = V @ KQ matrix multiplication:
    static_assert(DV <= DKQ, "bad DV");
    static_assert(DV % nbatch_K == 0 || (nbatch_K % 3 == 0 && DV % (nbatch_K*2/3) == 0), "bad nbatch_K");
    constexpr int nbatch_V = (DV % nbatch_K == 0 ? nbatch_K : nbatch_K*2/3) * nbatch_fa / DV; // Number of V columns that fit in SRAM for K.
    static_assert(nbatch_fa % nbatch_V == 0, "bad nbatch_V");
    static_assert(nbatch_V % np == 0, "bad nbatch_V");
#pragma unroll
    for (int k0 = 0; k0 < nbatch_fa; k0 += nbatch_V) {
        flash_attn_tile_load_tile<warp_size, nwarps, nbatch_V, DV, 0, oob_check>
            (V_h2 + int64_t(k_VKQ_0 + k0)*stride_V2, KV_tmp, stride_V2, k_VKQ_sup - k0);
        __syncthreads();

#ifdef FAST_FP16_AVAILABLE
#pragma unroll
        for (int k1 = 0; k1 < nbatch_V; k1 += np) {
            half2 V_k[(DVp/2)/warp_size];
            half2 KQ_k[cpw];

            constexpr int cpy_ne_D = cpy_ne/2 < (DVp/2)/warp_size ? cpy_ne/2 : (DVp/2)/warp_size;
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size*cpy_ne_D) {
                ggml_cuda_memcpy_1<cpy_ne_D*4>(&V_k[i0/warp_size], &KV_tmp[(k1 + threadIdx.y % np)*(DV/2) + i0 + threadIdx.x*cpy_ne_D]);
            }
#pragma unroll
            for (int jc_VKQ_0 = 0; jc_VKQ_0 < cpw; jc_VKQ_0 += KQ_cs) {
                const int jc_KQ = jc_VKQ_0/KQ_cs + (threadIdx.y / np)*(cpw/KQ_cs);

                half tmp[KQ_cs];
                ggml_cuda_memcpy_1<KQ_cs*sizeof(half)>(
                    &tmp, KQ + jc_KQ*(nbatch_fa*KQ_cs) + (k0 + k1 + threadIdx.y % np)*KQ_cs);
#pragma unroll
                for (int jc_VKQ_1 = 0; jc_VKQ_1 < KQ_cs; ++jc_VKQ_1) {
                    KQ_k[jc_VKQ_0+jc_VKQ_1] = __half2half2(tmp[jc_VKQ_1]);
                }
            }

#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size) {
#pragma unroll
                for (int jc_VKQ_0 = 0; jc_VKQ_0 < cpw; ++jc_VKQ_0) {
                    VKQ[jc_VKQ_0*((DVp/2)/warp_size) + i0/warp_size] += V_k[i0/warp_size]*KQ_k[jc_VKQ_0];
                }
            }
        }
#else
#pragma unroll
        for (int k1 = 0; k1 < nbatch_V; k1 += np) {
            float2 V_k[(DVp/2)/warp_size];
            float  KQ_k[cpw];

            constexpr int cpy_ne_D = cpy_ne < DVp/warp_size ? cpy_ne : DVp/warp_size;
#pragma unroll
            for (int i0 = 0; i0 < DVp; i0 += warp_size*cpy_ne_D) {
                ggml_cuda_memcpy_1<cpy_ne_D*4>(&V_k[i0/(2*warp_size)], &KV_tmp[(k1 + threadIdx.y % np)*DV + i0 + threadIdx.x*cpy_ne_D]);
            }
#pragma unroll
            for (int jc_VKQ_0 = 0; jc_VKQ_0 < cpw; jc_VKQ_0 += KQ_cs) {
                const int jc_KQ = jc_VKQ_0/KQ_cs + (threadIdx.y / np)*(cpw/KQ_cs);

                ggml_cuda_memcpy_1<KQ_cs*sizeof(float)>(
                    &KQ_k[jc_VKQ_0], KQ + jc_KQ*(nbatch_fa*KQ_cs) + (k0 + k1 + threadIdx.y % np)*KQ_cs);
            }

#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size) {
#pragma unroll
                for (int jc_VKQ_0 = 0; jc_VKQ_0 < cpw; ++jc_VKQ_0) {
                    VKQ[jc_VKQ_0*((DVp/2)/warp_size) + i0/warp_size].x += V_k[i0/warp_size].x*KQ_k[jc_VKQ_0];
                    VKQ[jc_VKQ_0*((DVp/2)/warp_size) + i0/warp_size].y += V_k[i0/warp_size].y*KQ_k[jc_VKQ_0];
                }
            }
        }
#endif // FAST_FP16_AVAILABLE

        __syncthreads();
    }
}

template<int DKQ, int DV, int ncols1, int ncols2, bool use_logit_softcap> // D == head size
__launch_bounds__(ggml_cuda_fattn_tile_get_nthreads(DKQ, DV, ncols1*ncols2), ggml_cuda_fattn_tile_get_occupancy(DKQ, DV, ncols1*ncols2))
static __global__ void flash_attn_tile(
        const char * __restrict__ Q,
        const char * __restrict__ K,
        const char * __restrict__ V,
        const char * __restrict__ mask,
        const char * __restrict__ sinks,
        const int  * __restrict__ KV_max,
        float      * __restrict__ dst,
        float2     * __restrict__ dst_meta,
        const float scale,
        const float max_bias,
        const float m0,
        const float m1,
        const uint32_t n_head_log2,
        const float logit_softcap,
        const int32_t ne00, const int32_t ne01, const int32_t ne02, const int32_t ne03,
                            const int32_t nb01, const int32_t nb02, const int32_t nb03,
        const int32_t ne10, const int32_t ne11, const int32_t ne12, const int32_t ne13,
                            const int32_t nb11, const int32_t nb12, const int64_t nb13,
                            const int32_t nb21, const int32_t nb22, const int64_t nb23,
                            const int32_t ne31, const int32_t ne32, const int32_t ne33,
                            const int32_t nb31, const int32_t nb32, const int64_t nb33) {
#ifdef FLASH_ATTN_AVAILABLE

    // Skip unused kernel variants for faster compilation:

    if (
#ifdef GGML_USE_WMMA_FATTN
            (ncols2 != 1 && DV != 40 && DV != 72 && DV != 512) ||
#endif // GGML_USE_WMMA_FATTN
            (use_logit_softcap && !(DV == 128 || DV == 256))
    ) {
        GGML_UNUSED_VARS(Q, K, V, mask, sinks, KV_max, dst, dst_meta, scale,
            max_bias, m0, m1, n_head_log2, logit_softcap,
            ne00, ne01, ne02, ne03,
                  nb01, nb02, nb03,
            ne10, ne11, ne12, ne13,
                  nb11, nb12, nb13,
                  nb21, nb22, nb23,
                  ne31, ne32, ne33,
                  nb31, nb32, nb33);
        NO_DEVICE_CODE;
        return;
    }

    static_assert(ggml_cuda_fattn_tile_get_config(DKQ, DV, ncols1*ncols2) != 0, "kernel config not defined");

    constexpr int ncols     = ncols1*ncols2;
    constexpr int warp_size = 32;
    constexpr int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, ncols1*ncols2) / warp_size;
    constexpr int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, ncols1*ncols2);
    constexpr int nbatch_K  = ggml_cuda_fattn_tile_get_nbatch_K (DKQ, DV, ncols1*ncols2);

    // In this kernel Q, K, V are matrices while i, j, k are matrix indices.

    const int col_Q_0 = blockIdx.x * ncols1; // Index of the first Q column for this CUDA block to work on.

    const int sequence = blockIdx.z / (ne02/ncols2);
    const int head0 = blockIdx.z*ncols2 - sequence*ne02; // == blockIdx.z % (ne02/ncols2)
    const int gqa_ratio = ne02 / ne12; // With grouped query attention there are > 1 Q matrices per K, V matrix.
    const float * Q_f  = (const float *) (Q + nb03*sequence + nb02* head0              + nb01*col_Q_0);
    const half2 * K_h2 = (const half2 *) (K + nb13*sequence + nb12*(head0 / gqa_ratio));
    const half2 * V_h2 = (const half2 *) (V + nb23*sequence + nb22*(head0 / gqa_ratio)); // K and V have same shape

    const half * maskh = mask ? (const half *) (mask + nb33*(sequence % ne33) + nb31*col_Q_0) : nullptr;

    const int stride_K2   = nb11 / sizeof(half2);
    const int stride_V2   = nb21 / sizeof(half2);
    const int stride_mask = nb31 / sizeof(half);

    const float slope = ncols2 == 1 ? get_alibi_slope(max_bias, head0, n_head_log2, m0, m1) : 1.0f;

    constexpr int cpy_nb = ggml_cuda_get_max_cpy_bytes();
    constexpr int cpy_ne = cpy_nb / 4;

    constexpr int cpw = ncols > nwarps ? ncols/nwarps : 1; // Q columns per warp.
    constexpr int np  = nwarps > ncols ? nwarps/ncols : 1; // Number of parallel warps per Q column.
    static_assert(cpw == 1 || np == 1, "bad cpw / np");
    static_assert(nbatch_fa % (np*warp_size) == 0, "nbatch_fa % (np*warp_size) != 0");

    constexpr int DKQp = (DKQ + 2*warp_size - 1) & ~(2*warp_size - 1); // DKQ padded to multiple of 2*warp_size.
    constexpr int DVp  = (DV  + 2*warp_size - 1) & ~(2*warp_size - 1); // DV  padded to multiple of 2*warp_size.

    // Q_tmp == SRAM buffer to hold Q data for the entire lifetime of the kernel.
    // KV_tmp == SRAM buffer to hold fragments of K/V data while iterating over ne11.
    //     KV_tmp is padded to avoid memory conflicts for K (cpy_ne) and OOB accesses for V (DVp-DV).
    // KQ == SRAM buffer to hold KQ fragments between KQ and VKQ matrix multiplications.
    // VKQ == Accumulators in registers for the final VKQ result.
#ifdef FAST_FP16_AVAILABLE
    __shared__ half2 Q_tmp[ncols * DKQ/2];
    __shared__ half2 KV_tmp[nbatch_fa * (nbatch_K/2 + cpy_ne) + DVp-DV];
    __shared__ half  KQ[ncols * nbatch_fa];
    half2 VKQ[cpw * ((DVp/2)/warp_size)] = {{0.0f, 0.0f}};
#else
    __shared__ float Q_tmp[ncols * DKQ];
    __shared__ float KV_tmp[nbatch_fa * (nbatch_K + cpy_ne) + DVp-DV];
    __shared__ float KQ[ncols * nbatch_fa];
    float2 VKQ[cpw * ((DVp/2)/warp_size)] = {{0.0f, 0.0f}};
#endif // FAST_FP16_AVAILABLE

    float KQ_max[cpw];
#pragma unroll
    for (int j0 = 0; j0 < ncols; j0 += nwarps) {
        KQ_max[j0/nwarps] = -FLT_MAX/2.0f;
    }
    float KQ_sum[cpw] = {0.0f};

    // Load Q data, convert to FP16 if fast:
#pragma unroll
    for (int jc0 = 0; jc0 < cpw; ++jc0) {
        const int jc = jc0 + (threadIdx.y / np)*cpw;

        const int j = jc / ncols2;
        const int c = jc % ncols2;

        constexpr int cpy_ne_D = cpy_ne < DKQp/warp_size ? cpy_ne : DKQp/warp_size;

#pragma unroll
        for (int i0 = 0; i0 < DKQp; i0 += np*warp_size*cpy_ne_D) {
            if (i0 + np*warp_size*cpy_ne_D <= DKQ || i0 + (threadIdx.y % np)*(warp_size*cpy_ne_D) + threadIdx.x*cpy_ne_D < DKQ) {
                float tmp_f[cpy_ne_D] = {0.0f};
                if (ncols1 == 1 || col_Q_0 + j < ne01) {
                    ggml_cuda_memcpy_1<sizeof(tmp_f)>
                        (tmp_f, &Q_f[c*(nb02/sizeof(float)) + j*(nb01/sizeof(float))
                                     + i0 + (threadIdx.y % np)*(warp_size*cpy_ne_D) + threadIdx.x*cpy_ne_D]);
                }

#pragma unroll
                for (int i1 = 0; i1 < cpy_ne_D; ++i1) {
                    tmp_f[i1] *= scale;
                }

#ifdef FAST_FP16_AVAILABLE
                half2 tmp_h2[cpy_ne_D/2];
#pragma unroll
                for (int i1 = 0; i1 < cpy_ne_D; i1 += 2) {
                    tmp_h2[i1/2] = make_half2(tmp_f[i1 + 0], tmp_f[i1 + 1]);
                }
                ggml_cuda_memcpy_1<sizeof(tmp_h2)>(
                    &Q_tmp[jc*(DKQ/2) + i0/2 + (threadIdx.y % np)*(warp_size*cpy_ne_D/2) + threadIdx.x*(cpy_ne_D/2)],
                    tmp_h2);
#else
                ggml_cuda_memcpy_1<sizeof(tmp_f)>(
                    &Q_tmp[jc* DKQ    + i0   + (threadIdx.y % np)*(warp_size*cpy_ne_D)   + threadIdx.x* cpy_ne_D],
                    tmp_f);
#endif // FAST_FP16_AVAILABLE
            }
        }
    }

    __syncthreads();

    // Main loop over KV cache:
    const int k_VKQ_max = KV_max ? KV_max[sequence*gridDim.x + blockIdx.x] : ne11;
    if (ncols2 == 1) {
        // Branch with out-of-bounds checks.
        int k_VKQ_0 = blockIdx.y*nbatch_fa;
        while (k_VKQ_0 < k_VKQ_max - nbatch_fa) {
            constexpr bool oob_check = false;
            flash_attn_tile_iter<warp_size, nwarps, ncols1, ncols2, DKQ, DV, nbatch_fa, nbatch_K, use_logit_softcap, oob_check>
                (Q_tmp, K_h2, V_h2, maskh, logit_softcap, slope, KQ, KV_tmp,
                stride_K2, stride_V2, stride_mask, KQ_max, KQ_sum, VKQ, k_VKQ_0, k_VKQ_max);
            k_VKQ_0 += gridDim.y*nbatch_fa;
        }
        if (k_VKQ_0 < k_VKQ_max) {
            constexpr bool oob_check = true;
            flash_attn_tile_iter<warp_size, nwarps, ncols1, ncols2, DKQ, DV, nbatch_fa, nbatch_K, use_logit_softcap, oob_check>
                (Q_tmp, K_h2, V_h2, maskh, logit_softcap, slope, KQ, KV_tmp,
                stride_K2, stride_V2, stride_mask, KQ_max, KQ_sum, VKQ, k_VKQ_0, k_VKQ_max);
        }
    } else {
        // Branch without out-of-bounds checks.
        for (int k_VKQ_0 = blockIdx.y*nbatch_fa; k_VKQ_0 < k_VKQ_max; k_VKQ_0 += gridDim.y*nbatch_fa) {
            constexpr bool oob_check = false;
            flash_attn_tile_iter<warp_size, nwarps, ncols1, ncols2, DKQ, DV, nbatch_fa, nbatch_K, use_logit_softcap, oob_check>
                (Q_tmp, K_h2, V_h2, maskh, logit_softcap, slope, KQ, KV_tmp,
                stride_K2, stride_V2, stride_mask, KQ_max, KQ_sum, VKQ, k_VKQ_0, k_VKQ_max);
        }
    }

#pragma unroll
    for (int jc0 = 0; jc0 < cpw; ++jc0) {
        KQ_sum[jc0] = warp_reduce_sum<warp_size>(KQ_sum[jc0]);
    }

    if constexpr (np > 1) {
        static_assert(cpw == 1, "bad cpw");
        static_assert(nbatch_fa*nbatch_K >= nwarps*DVp, "KV_tmp too small");

#ifdef FAST_FP16_AVAILABLE
        half2 * VKQ_combine    = (half2 *) KV_tmp;
#else
        float * VKQ_combine    = (float *) KV_tmp;
#endif // FAST_FP16_AVAILABLE
        float * KQ_sum_combine = (float *) Q_tmp;

        if (threadIdx.y % np != 0) {
#ifdef FAST_FP16_AVAILABLE
            constexpr int cpy_ne_D = cpy_ne < (DVp/2)/warp_size ? cpy_ne : (DVp/2)/warp_size;
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size*cpy_ne_D) {
                ggml_cuda_memcpy_1<cpy_ne_D*4>(&VKQ_combine[threadIdx.y*(DVp/2) + i0 + threadIdx.x*cpy_ne_D], &VKQ[i0/warp_size]);
            }
#else
            constexpr int cpy_ne_D = cpy_ne < DVp/warp_size ? cpy_ne : DVp/warp_size;
#pragma unroll
            for (int i0 = 0; i0 < DVp; i0 += warp_size*cpy_ne_D) {
                ggml_cuda_memcpy_1<cpy_ne_D*4>(
                    &VKQ_combine[threadIdx.y*DVp + i0 + threadIdx.x*cpy_ne_D], ((const float *) VKQ) + i0/warp_size);
            }
#endif // FAST_FP16_AVAILABLE

            if (threadIdx.x == 0) {
                KQ_sum_combine[threadIdx.y] = KQ_sum[0];
            }

            return;
        }

        __syncthreads();

#pragma unroll
        for (int ip = 1; ip < np; ++ip) {
#ifdef FAST_FP16_AVAILABLE
            constexpr int cpy_ne_D = cpy_ne < (DVp/2)/warp_size ? cpy_ne : (DVp/2)/warp_size;
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size*cpy_ne_D) {
                half2 tmp[cpy_ne_D];
                ggml_cuda_memcpy_1<cpy_ne_D*4>(tmp, &VKQ_combine[(threadIdx.y + ip)*(DVp/2) + i0 + threadIdx.x*cpy_ne_D]);
#pragma unroll
                for (int i1 = 0; i1 < cpy_ne_D; ++i1) {
                    VKQ[i0/warp_size + i1] += tmp[i1];
                }
            }
#else
            constexpr int cpy_ne_D = cpy_ne < DVp/warp_size ? cpy_ne : DVp/warp_size;
#pragma unroll
            for (int i0 = 0; i0 < DVp; i0 += warp_size*cpy_ne_D) {
                float tmp[cpy_ne_D];
                ggml_cuda_memcpy_1<cpy_ne_D*4>(tmp, &VKQ_combine[(threadIdx.y + ip)*DVp + i0 + threadIdx.x*cpy_ne_D]);
#pragma unroll
                for (int i1 = 0; i1 < cpy_ne_D; ++i1) {
                    ((float *)VKQ)[i0/warp_size + i1] += tmp[i1];
                }
            }
#endif // FAST_FP16_AVAILABLE

            KQ_sum[0] += KQ_sum_combine[threadIdx.y + ip];
        }
    }

    // Attention sink: adjust KQ max and sum only for the first of all parallel blocks:
    if (sinks && blockIdx.y == 0) {
#pragma unroll
        for (int jc0 = 0; jc0 < cpw; ++jc0) {
            const int jc = jc0 + (threadIdx.y/np)*cpw;
            const float sink = ((const float *) sinks)[head0 + jc % ncols2];

            float KQ_max_new_j = fmaxf(KQ_max[jc0], sink);
            const float KQ_max_scale = expf(KQ_max[jc0] - KQ_max_new_j);
            KQ_max[jc0] = KQ_max_new_j;

            const float val = expf(sink - KQ_max[jc0]);
            KQ_sum[jc0] = KQ_sum[jc0]*KQ_max_scale + val;

#ifdef FAST_FP16_AVAILABLE
            const half2 KQ_max_scale_h2 = make_half2(KQ_max_scale, KQ_max_scale);
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size) {
                VKQ[jc0*((DVp/2)/warp_size) + i0/warp_size] *= KQ_max_scale_h2;
            }
#else
#pragma unroll
            for (int i0 = 0; i0 < DVp/2; i0 += warp_size) {
                VKQ[jc0*((DVp/2)/warp_size) + i0/warp_size].x *= KQ_max_scale;
                VKQ[jc0*((DVp/2)/warp_size) + i0/warp_size].y *= KQ_max_scale;
            }
#endif // FAST_FP16_AVAILABLE
        }
    }

    // Write back results:
#pragma unroll
    for (int jc0 = 0; jc0 < cpw; ++jc0) {
        const int jc = jc0 + (threadIdx.y/np)*cpw;

        const int j = jc / ncols2;
        const int c = jc % ncols2;

        if (ncols1 > 1 && col_Q_0 + j >= ne01) {
            return;
        }

        const float scale = gridDim.y == 1 ? 1.0f/KQ_sum[jc0] : 1.0f;

        const int j_dst_unrolled = ((sequence*ne01 + col_Q_0 + j)*ne02 + head0 + c)*gridDim.y + blockIdx.y;

#ifdef FAST_FP16_AVAILABLE
        constexpr int cpy_ne_D = cpy_ne/2 < (DVp/2)/warp_size ? cpy_ne/2 : (DVp/2)/warp_size;
#pragma unroll
        for (int i0 = 0; i0 < DVp/2; i0 += warp_size*cpy_ne_D) {
            float2 tmp[cpy_ne_D];
#pragma unroll
            for (int i1 = 0; i1 < cpy_ne_D; ++i1) {
                tmp[i1] = __half22float2(VKQ[jc0*((DVp/2)/warp_size) + i0/warp_size + i1]);
                tmp[i1].x *= scale;
                tmp[i1].y *= scale;
            }
            if (i0 + warp_size*cpy_ne_D <= DV/2 || i0 + threadIdx.x*cpy_ne_D < DV/2) {
                ggml_cuda_memcpy_1<sizeof(tmp)>(&dst[j_dst_unrolled*DV + 2*i0 + threadIdx.x*(2*cpy_ne_D)], tmp);
            }
        }
#else
        constexpr int cpy_ne_D = cpy_ne < DVp/warp_size ? cpy_ne : DVp/warp_size;
#pragma unroll
        for (int i0 = 0; i0 < DVp; i0 += warp_size*cpy_ne_D) {
            if (i0 + warp_size*cpy_ne_D <= DV || i0 + threadIdx.x*cpy_ne_D < DV) {
#pragma unroll
                for (int i1 = 0; i1 < cpy_ne_D/2; ++i1) {
                    VKQ[jc0*((DVp/2)/warp_size) + i0/(2*warp_size) + i1].x *= scale;
                    VKQ[jc0*((DVp/2)/warp_size) + i0/(2*warp_size) + i1].y *= scale;
                }
                ggml_cuda_memcpy_1<cpy_ne_D*4>(
                    &dst[j_dst_unrolled*DV + i0 + threadIdx.x*cpy_ne_D],
                    &VKQ[jc0*((DVp/2)/warp_size) + i0/(2*warp_size)]);
            }
        }
#endif // FAST_FP16_AVAILABLE

        if (gridDim.y != 1 && threadIdx.x == 0) {
            dst_meta[j_dst_unrolled] = make_float2(KQ_max[jc0], KQ_sum[jc0]);
        }
    }
#else
    GGML_UNUSED_VARS(Q, K, V, mask, sinks, KV_max, dst, dst_meta, scale,
        max_bias, m0, m1, n_head_log2, logit_softcap,
        ne00, ne01, ne02, ne03,
              nb01, nb02, nb03,
        ne10, ne11, ne12, ne13,
              nb11, nb12, nb13,
              nb21, nb22, nb23,
              ne31, ne32, ne33,
              nb31, nb32, nb33);
    NO_DEVICE_CODE;
#endif // FLASH_ATTN_AVAILABLE
}

template <int DKQ, int DV, int ncols2, bool use_logit_softcap>
static void launch_fattn_tile_switch_ncols1(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
    const ggml_tensor * Q = dst->src[0];

    const int id        = ggml_cuda_get_device();
    const int cc        = ggml_cuda_info().devices[id].cc;
    const int warp_size = 32;

    constexpr size_t nbytes_shared = 0;

#ifdef GGML_USE_HIP
    if constexpr (DV <= 128) {
        if (Q->ne[1] > 32/ncols2) {
            constexpr int cols_per_block = 64;
            const int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, cols_per_block, cc) / warp_size;
            const int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, cols_per_block, cc);
            fattn_kernel_t fattn_kernel = flash_attn_tile<DKQ, DV, cols_per_block/ncols2, ncols2, use_logit_softcap>;
            launch_fattn<DV, cols_per_block/ncols2, ncols2>
                (ctx, dst, fattn_kernel, nwarps, nbytes_shared, nbatch_fa, true, true, false, warp_size);
            return;
        }
    }
#endif // GGML_USE_HIP

#ifndef GGML_USE_HIP
    if constexpr (DV <= 256)
#endif // GGML_USE_HIP
    {
        if (Q->ne[1] > 16/ncols2) {
            constexpr int cols_per_block = 32;
            const int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, cols_per_block, cc) / warp_size;
            const int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, cols_per_block, cc);
            fattn_kernel_t fattn_kernel = flash_attn_tile<DKQ, DV, cols_per_block/ncols2, ncols2, use_logit_softcap>;
            launch_fattn<DV, cols_per_block/ncols2, ncols2>
                (ctx, dst, fattn_kernel, nwarps, nbytes_shared, nbatch_fa, true, true, false, warp_size);
            return;
        }
    }

    if (Q->ne[1] > 8/ncols2) {
        constexpr int cols_per_block = 16;
        const int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, cols_per_block, cc) / warp_size;
        const int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, cols_per_block, cc);
        fattn_kernel_t fattn_kernel = flash_attn_tile<DKQ, DV, cols_per_block/ncols2, ncols2, use_logit_softcap>;
        launch_fattn<DV, cols_per_block/ncols2, ncols2>
            (ctx, dst, fattn_kernel, nwarps, nbytes_shared, nbatch_fa, true, true, false, warp_size);
        return;
    }

    if constexpr (ncols2 <= 8) {
        if (Q->ne[1] > 4/ncols2) {
            constexpr int cols_per_block = 8;
            const int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, cols_per_block, cc) / warp_size;
            const int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, cols_per_block, cc);
            fattn_kernel_t fattn_kernel = flash_attn_tile<DKQ, DV, cols_per_block/ncols2, ncols2, use_logit_softcap>;
            launch_fattn<DV, cols_per_block/ncols2, ncols2>
                (ctx, dst, fattn_kernel, nwarps, nbytes_shared, nbatch_fa, true, true, false, warp_size);
            return;
        }
    }

    if constexpr (ncols2 <= 4) {
        if (Q->ne[1] > 2/ncols2) {
            constexpr int cols_per_block = 4;
            const int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, cols_per_block, cc) / warp_size;
            const int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, cols_per_block, cc);
            fattn_kernel_t fattn_kernel = flash_attn_tile<DKQ, DV, cols_per_block/ncols2, ncols2, use_logit_softcap>;
            launch_fattn<DV, cols_per_block/ncols2, ncols2>
                (ctx, dst, fattn_kernel, nwarps, nbytes_shared, nbatch_fa, true, true, false, warp_size);
            return;
        }
    }

    if constexpr (ncols2 <= 2) {
        constexpr int cols_per_block = 2;
        const int nwarps    = ggml_cuda_fattn_tile_get_nthreads (DKQ, DV, cols_per_block, cc) / warp_size;
        const int nbatch_fa = ggml_cuda_fattn_tile_get_nbatch_fa(DKQ, DV, cols_per_block, cc);
        fattn_kernel_t fattn_kernel = flash_attn_tile<DKQ, DV, cols_per_block/ncols2, ncols2, use_logit_softcap>;
        launch_fattn<DV, cols_per_block/ncols2, ncols2>
            (ctx, dst, fattn_kernel, nwarps, nbytes_shared, nbatch_fa, true, true, false, warp_size);
        return;
    }

    GGML_ABORT("fatal error");
}

template <int DKQ, int DV, bool use_logit_softcap>
static void launch_fattn_tile_switch_ncols2(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
    const ggml_tensor * KQV  = dst;
    const ggml_tensor * Q    = dst->src[0];
    const ggml_tensor * K    = dst->src[1];
    const ggml_tensor * mask = dst->src[3];

    float max_bias = 0.0f;
    memcpy(&max_bias, (const float *) KQV->op_params + 1, sizeof(float));

    GGML_ASSERT(Q->ne[2] % K->ne[2] == 0);
    const int gqa_ratio = Q->ne[2] / K->ne[2];

    const bool nvidia = GGML_CUDA_CC_IS_NVIDIA(ggml_cuda_info().devices[ggml_cuda_get_device()].cc);
    const int gqa_limit = nvidia && gqa_ratio <= 4 ? 16 : INT_MAX;
    const bool use_gqa_opt = mask && max_bias == 0.0f && Q->ne[1] <= gqa_limit && K->ne[1] % FATTN_KQ_STRIDE == 0;

    if constexpr (DV == 512) {
        if (use_gqa_opt && gqa_ratio % 16 == 0) {
            launch_fattn_tile_switch_ncols1<DKQ, DV, 16, use_logit_softcap>(ctx, dst);
            return;
        }
    }

    if constexpr (DV <= 256) {
        if (use_gqa_opt && gqa_ratio % 8 == 0) {
            launch_fattn_tile_switch_ncols1<DKQ, DV, 8, use_logit_softcap>(ctx, dst);
            return;
        }

        if (use_gqa_opt && gqa_ratio % 4 == 0) {
            launch_fattn_tile_switch_ncols1<DKQ, DV, 4, use_logit_softcap>(ctx, dst);
            return;
        }

        if (use_gqa_opt && gqa_ratio % 2 == 0) {
            launch_fattn_tile_switch_ncols1<DKQ, DV, 2, use_logit_softcap>(ctx, dst);
            return;
        }

        launch_fattn_tile_switch_ncols1<DKQ, DV, 1, use_logit_softcap>(ctx, dst);
        return;
    }
    GGML_ABORT("fatal error");
}

template <int DKQ, int DV>
void ggml_cuda_flash_attn_ext_tile_case(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
    const ggml_tensor * KQV = dst;

    float logit_softcap;
    memcpy(&logit_softcap, (const float *) KQV->op_params + 2, sizeof(float));

    if (logit_softcap == 0.0f) {
        constexpr bool use_logit_softcap = false;
        launch_fattn_tile_switch_ncols2<DKQ, DV, use_logit_softcap>(ctx, dst);
    } else {
        constexpr bool use_logit_softcap = true;
        launch_fattn_tile_switch_ncols2<DKQ, DV, use_logit_softcap>(ctx, dst);
    }
}

void ggml_cuda_flash_attn_ext_tile(ggml_backend_cuda_context & ctx, ggml_tensor * dst);

#define DECL_FATTN_TILE_CASE(DKQ, DV)                             \
    template void ggml_cuda_flash_attn_ext_tile_case              \
    <DKQ, DV>(ggml_backend_cuda_context & ctx, ggml_tensor * dst) \

extern DECL_FATTN_TILE_CASE( 40,  40);
extern DECL_FATTN_TILE_CASE( 64,  64);
extern DECL_FATTN_TILE_CASE( 72,  72);
extern DECL_FATTN_TILE_CASE( 80,  80);
extern DECL_FATTN_TILE_CASE( 96,  96);
extern DECL_FATTN_TILE_CASE(112, 112);
extern DECL_FATTN_TILE_CASE(128, 128);
extern DECL_FATTN_TILE_CASE(256, 256);
extern DECL_FATTN_TILE_CASE(576, 512);
