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Fix FMHA split-KV for paged-KV with page_block_size < kN0

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Cherry-picked from aghamari/unified-attention-decode-opt (fadf0d585).
- block_masking.hpp: 5-param GetTileRangeAlongX for GenericAttentionMask
- fmha_fwd_splitkv.py: bn0=32 for hdim=64

Made-with: Cursor
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root
2026-04-01 16:24:19 +00:00
parent 4c5e290378
commit 6729989b97
2 changed files with 41 additions and 2 deletions
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4
example/ck_tile/01_fmha/codegen/ops/fmha_fwd_splitkv.py
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@@ -821,7 +821,7 @@ class KernelComponentFactoryGfx9(KernelComponentFactoryBase):
if dtype in ["fp16", "bf16"]:
return {
"32" : FmhaFwdTileSize( 32, 64, 16, 32, 32, 32, 2, 1, 1, 2, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"64" : FmhaFwdTileSize( 64, 64, 32, 64, 32, 64, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"64" : FmhaFwdTileSize( 64, 32, 32, 64, 32, 64, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"96" : FmhaFwdTileSize( 64, 128, 32, 128, 32, 96, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"128": FmhaFwdTileSize( 64, 128, 32, 128, 32, 128, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
# "160" : FmhaFwdTileSize(64, 128, 32, 160, 32, 160, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
@@ -862,7 +862,7 @@ class KernelComponentFactoryGfx12(KernelComponentFactoryBase):
return {
# bm0, bn0, bk0, bn1, bk1,
"32" : FmhaFwdTileSize( 64, 64, 16, 32, 32, 32, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"64" : FmhaFwdTileSize( 64, 64, 32, 64, 32, 64, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"64" : FmhaFwdTileSize( 64, 32, 32, 64, 32, 64, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"128": FmhaFwdTileSize( 64, 64, 32, 128, 32, 128, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
"256": FmhaFwdTileSize( 64, 64, 32, 256, 32, 256, 4, 1, 1, 4, 1, 1, 16, 16, 16, 16, 16, 16, -1),
} # fmt: skip

39
include/ck_tile/ops/fmha/block/block_masking.hpp
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@@ -180,6 +180,45 @@ struct GenericAttentionMask
}
}
template <index_t TileHeight, index_t TileWidth>
CK_TILE_HOST_DEVICE constexpr auto GetTileRangeAlongX(index_t i_y,
number<TileHeight> height,
number<TileWidth> width,
index_t num_splits,
index_t i_split) const
{
auto [origin_start, origin_end] = GetTileRangeAlongX(i_y, height, width);
const index_t x_per_split = ck_tile::max(1, integer_divide_ceil(x_total, num_splits));
const index_t split_start = x_per_split * i_split;
const index_t split_end = ck_tile::min(x_total, split_start + x_per_split);
return ck_tile::make_tuple(ck_tile::max(origin_start, split_start),
ck_tile::min(origin_end, split_end));
}
template <index_t TileHeight, index_t TileWidth>
CK_TILE_HOST_DEVICE constexpr auto GetSinkTileRangeAlongX(index_t i_y,
number<TileHeight> height,
number<TileWidth> width,
index_t num_splits,
index_t i_split) const
{
auto [origin_start, origin_end] = GetTileRangeAlongX(i_y, height, width);
const index_t x_per_split = ck_tile::max(1, integer_divide_ceil(x_total, num_splits));
const index_t split_start = x_per_split * i_split;
const index_t split_end = ck_tile::min(x_total, split_start + x_per_split);
const index_t sink_seq_end = sink > 0 ? ((sink + width - 1) / width) * width : 0;
const index_t start = ck_tile::max(origin_start, split_start);
const index_t end = ck_tile::min(origin_end, split_end);
const bool is_first_intersecting_split =
(split_start <= sink_seq_end) && (split_end > 0) && (sink > 0);
if(is_first_intersecting_split)
return ck_tile::make_tuple(0, 0, end);
else
return ck_tile::make_tuple(sink_seq_end, start, end);
}
// to get the loop length along Y axis, return index:[start, end), end-start=length
// use this if need loop over Y axis tile by tile (like q-seqlen loopover)
// TODO: y_end still could be negative, so end-start could be negative(need check)