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vulkan: Handle updated FA dim2/3 definition (#14518)

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* vulkan: Handle updated FA dim2/3 definition

Pack mask boolean and n_head_log2 into a single dword to keep the push
constant block under the 128B limit.

* handle null mask for gqa

* allow gqa with dim3>1
This commit is contained in:
Jeff Bolz
2025-07-05 02:26:04 -05:00
committed by GitHub
parent ddef99522d
commit a0374a67e2
5 changed files with 26 additions and 24 deletions
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6
ggml/src/ggml-vulkan/vulkan-shaders/flash_attn.comp
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@@ -101,8 +101,8 @@ void main() {
uint32_t v_offset = (iv2*p.nb22 + iv3*p.nb23) / 2;
#endif
uint32_t m_offset = 0;
if (p.nem2 != 1) {
m_offset = (iq3 % p.nem2) * p.nem1 * KV;
if (p.nem2 != 1 || p.nem3 != 1) {
m_offset = ((iq3 % p.nem3) * p.nem2 + (iq2 % p.nem2)) * p.nem1 * KV;
}
[[dont_unroll]]
@@ -149,7 +149,7 @@ void main() {
}
}
if (p.mask != 0) {
if ((p.mask_n_head_log2 & MASK_ENABLE_BIT) != 0) {
[[unroll]] for (uint32_t idx = 0; idx < Bc * Br; idx += gl_WorkGroupSize.x) {
uint32_t c = (idx + tid) % Bc;