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ggml : fix FA mask dim 2 and 3 (llama/14505)

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* ggml : fix FA mask dim 2 and 3

ggml-ci

* backends : unsupport batched FA in CUDA and Vulkan

ggml-ci

* vulkan : disable FA for mask->ne[2] != 1
This commit is contained in:
Georgi Gerganov
2025-07-03 10:46:57 +03:00
parent 9cde908c0a
commit 0abd0660e1
8 changed files with 24 additions and 13 deletions
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13
ggml/include/ggml.h
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@ -1980,15 +1980,16 @@ extern "C" {
#define GGML_KQ_MASK_PAD 64
// q: [n_embd_k, n_batch, n_head, ne3]
// k: [n_embd_k, n_kv, n_head_kv, ne3]
// v: [n_embd_v, n_kv, n_head_kv, ne3] !! not transposed !!
// mask: [n_kv, n_batch_pad, ne32, 1] !! n_batch_pad = GGML_PAD(n_batch, GGML_KQ_MASK_PAD) !!
// res: [n_embd_v, n_head, n_batch, ne3] !! permuted !!
// q: [n_embd_k, n_batch, n_head, ne3 ]
// k: [n_embd_k, n_kv, n_head_kv, ne3 ]
// v: [n_embd_v, n_kv, n_head_kv, ne3 ] !! not transposed !!
// mask: [n_kv, n_batch_pad, ne32, ne33] !! n_batch_pad = GGML_PAD(n_batch, GGML_KQ_MASK_PAD) !!
// res: [n_embd_v, n_head, n_batch, ne3 ] !! permuted !!
//
// broadcast:
// n_head % n_head_kv == 0
// ne3 % ne32 == 0
// n_head % ne32 == 0
// ne3 % ne33 == 0
//
GGML_API struct ggml_tensor * ggml_flash_attn_ext(
struct ggml_context * ctx,

2
ggml/src/ggml-cpu/ops.cpp
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@ -7799,7 +7799,7 @@ static void ggml_compute_forward_flash_attn_ext_f16(
memset(VKQ32, 0, DV*sizeof(float));
}
const ggml_fp16_t * mp = mask ? (ggml_fp16_t *)((char *) mask->data + iq1*mask->nb[1] + (iq3%mask->ne[2])*mask->nb[2]) : NULL;
const ggml_fp16_t * mp = mask ? (ggml_fp16_t *)((char *) mask->data + iq1*mask->nb[1] + (iq2%mask->ne[2])*mask->nb[2] + (iq3%mask->ne[3])*mask->nb[3]) : NULL;
// k indices
const int ik3 = iq3 / rk3;

3
ggml/src/ggml-cuda/ggml-cuda.cu
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@ -3390,7 +3390,8 @@ static bool ggml_backend_cuda_device_supports_op(ggml_backend_dev_t dev, const g
return false;
}
// TODO: support broadcast
// ref: https://github.com/ggml-org/llama.cpp/pull/14435
// note: this was initially implemented in https://github.com/ggml-org/llama.cpp/pull/14500, but
// the interface of ggml_flash_attn_ext() changed in https://github.com/ggml-org/llama.cpp/pull/14505
if (op->src[0]->ne[3] != 1) {
return false;
}

2
ggml/src/ggml-metal/ggml-metal-impl.h
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@ -230,8 +230,10 @@ typedef struct {
uint64_t nb22;
uint64_t nb23;
int32_t ne32;
int32_t ne33;
uint64_t nb31;
uint64_t nb32;
uint64_t nb33;
int32_t ne1;
int32_t ne2;
float scale;

2
ggml/src/ggml-metal/ggml-metal.m
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@ -5018,8 +5018,10 @@ static bool ggml_metal_encode_node(
/*.nb22 =*/ nb22,
/*.nb23 =*/ nb23,
/*.ne32 =*/ ne32,
/*.ne33 =*/ ne33,
/*.nb31 =*/ nb31,
/*.nb32 =*/ nb32,
/*.nb33 =*/ nb33,
/*.ne1 =*/ ne1,
/*.ne2 =*/ ne2,
/*.scale =*/ scale,

4
ggml/src/ggml-metal/ggml-metal.metal
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@ -3857,7 +3857,7 @@ kernel void kernel_flash_attn_ext(
// load the mask in shared memory
#pragma unroll(Q)
for (short j = 0; j < Q; ++j) {
device const half * pm = (device const half *) ((device const char *) mask + (iq1 + j)*args.nb31 + (iq3%args.ne32)*args.nb32);
device const half * pm = (device const half *) ((device const char *) mask + (iq1 + j)*args.nb31 + (iq2%args.ne32)*args.nb32 + (iq3%args.ne33)*args.nb33);
const float m = pm[ic + tiisg];
@ -4343,7 +4343,7 @@ kernel void kernel_flash_attn_ext_vec(
const bool has_mask = mask != q;
// pointer to the mask
device const half * pm = (device const half *) (mask + iq1*args.nb31 + (iq3%args.ne32)*args.nb32);
device const half * pm = (device const half *) (mask + iq1*args.nb31 + (iq2%args.ne32)*args.nb32 + (iq3%args.ne33)*args.nb33);
float slope = 1.0f;

6
ggml/src/ggml-vulkan/ggml-vulkan.cpp
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@ -10265,6 +10265,12 @@ static bool ggml_backend_vk_device_supports_op(ggml_backend_dev_t dev, const ggm
if (op->src[3] && op->src[3]->type != GGML_TYPE_F16) {
return false;
}
// TODO: support broadcast
// note: this was initially implemented in https://github.com/ggml-org/llama.cpp/pull/14449, but
// the interface of ggml_flash_attn_ext() changed in https://github.com/ggml-org/llama.cpp/pull/14505
if (op->src[0]->ne[3] != 1 || (op->src[3] && op->src[3]->ne[2] != 1)) {
return false;
}
// It's straightforward to support different K/V dequant, but would
// significantly increase the number of pipelines
if (op->src[1]->type != op->src[2]->type) {

5
ggml/src/ggml.c
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@ -3666,7 +3666,6 @@ static struct ggml_tensor * ggml_soft_max_impl(
if (mask) {
GGML_ASSERT(mask->type == GGML_TYPE_F16 || mask->type == GGML_TYPE_F32);
GGML_ASSERT(ggml_is_contiguous(mask));
GGML_ASSERT(ggml_is_3d(mask));
GGML_ASSERT(mask->ne[0] == a->ne[0]);
GGML_ASSERT(mask->ne[1] >= a->ne[1]);
GGML_ASSERT(a->ne[2]%mask->ne[2] == 0);
@ -4696,12 +4695,12 @@ struct ggml_tensor * ggml_flash_attn_ext(
if (mask) {
GGML_ASSERT(ggml_is_contiguous(mask));
GGML_ASSERT(mask->ne[2] == q->ne[3]);
GGML_ASSERT(mask->ne[1] >= GGML_PAD(q->ne[1], GGML_KQ_MASK_PAD) &&
"the Flash-Attention kernel requires the mask to be padded to GGML_KQ_MASK_PAD and at least n_queries big");
//GGML_ASSERT(ggml_can_repeat_rows(mask, qk));
GGML_ASSERT(q->ne[3] % mask->ne[2] == 0);
GGML_ASSERT(q->ne[2] % mask->ne[2] == 0);
GGML_ASSERT(q->ne[3] % mask->ne[3] == 0);
}
if (max_bias > 0.0f) {