issue/867 - feat: adjust paged_attention_prefill interface naming

include/infinicore/ops/paged_attention_prefill.hpp

@@ -8,11 +8,45 @@ namespace infinicore::op {
 
 class PagedAttentionPrefill {
 public:
-    using schema = void (*)(Tensor, Tensor, Tensor, Tensor, Tensor, Tensor, Tensor, Tensor, std::optional<Tensor>, float);
-    static void execute(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float);
+    /**
+     * @brief PagedAttentionPrefill operator signature
+     * * Argument order:
+     * 1. out: Output tensor (Packed format)
+     * 2. q: Current Query tensor (Packed format)
+     * 3. k_cache: Physical Key cache (Paged format)
+     * 4. v_cache: Physical Value cache (Paged format)
+     * 5. block_tables: Mapping table from logical blocks to physical blocks
+     * 6. history_lens: Historical KV lengths (existing length of each sequence in cache)
+     * 7. cu_seqlens_q: Cumulative sequence lengths of Query (prefix sum for variable-length batch)
+     * 8. alibi_slopes: ALiBi bias slopes (optional)
+     * 9. scale: Scaling factor (typically 1/sqrt(head_size))
+     */
+    using schema = void (*)(Tensor, Tensor, Tensor, Tensor, Tensor, Tensor, Tensor, std::optional<Tensor>, float);
+
+    static void execute(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache,
+                        Tensor block_tables, Tensor history_lens, Tensor cu_seqlens_q,
+                        std::optional<Tensor> alibi_slopes, float scale);
+
     static common::OpDispatcher<schema> &dispatcher();
 };
 
-Tensor paged_attention_prefill(Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float scale);
-void paged_attention_prefill_(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float scale);
+Tensor paged_attention_prefill(Tensor q,
+                               Tensor k_cache,
+                               Tensor v_cache,
+                               Tensor block_tables,
+                               Tensor history_lens,
+                               Tensor cu_seqlens_q,
+                               std::optional<Tensor> alibi_slopes,
+                               float scale);
+
+void paged_attention_prefill_(Tensor out,
+                              Tensor q,
+                              Tensor k_cache,
+                              Tensor v_cache,
+                              Tensor block_tables,
+                              Tensor history_lens,
+                              Tensor cu_seqlens_q,
+                              std::optional<Tensor> alibi_slopes,
+                              float scale);
+
 } // namespace infinicore::op

include/infiniop/ops/paged_attention_prefill.h

@@ -11,15 +11,22 @@ typedef struct InfiniopDescriptor *infiniopPagedAttentionPrefillDescriptor_t;
  * @param handle The handle to the InfiniOP library context.
  * @param desc_ptr A pointer to store the created descriptor.
  * @param out_desc Descriptor for the output tensor.
+ * Shape: [total_q_tokens, num_heads, head_size]
  * @param q_desc Descriptor for the query tensor (packed/flattened).
+ * Shape: [total_q_tokens, num_heads, head_size]
  * @param k_cache_desc Descriptor for the global physical key cache.
+ * Shape: [max_num_blocks, num_kv_heads, block_size, head_size]
  * @param v_cache_desc Descriptor for the global physical value cache.
+ * Shape: [max_num_blocks, num_kv_heads, block_size, head_size]
  * @param block_tables_desc Descriptor for the block tables mapping logic to physical blocks.
- * @param cache_lens_desc Descriptor for the total sequence lengths (history + current).
- * @param seq_lens_desc Descriptor for the current prefill sequence lengths.
- * @param offset_desc Descriptor for the start position of each sequence in the packed Q tensor.
+ * Shape: [batch_size, max_blocks_per_seq]
+ * @param history_lens_desc Descriptor for the KV history lengths of each sequence.
+ * Shape: [batch_size]
+ * @param cum_seq_lens_q_desc Descriptor for the cumulative start position (prefix sum) of each Q sequence.
+ * Shape: [batch_size + 1]
  * @param alibi_slopes_desc Optional descriptor for the ALiBi slopes tensor. Can be NULL.
- * @param scale The attention scaling factor.
+ * Shape: [num_heads]
+ * @param scale The attention scaling factor (typically 1.0 / sqrt(head_size)).
  * @return infiniStatus_t Status code of the operation.
  */
 __C __export infiniStatus_t infiniopCreatePagedAttentionPrefillDescriptor(
@@ -30,9 +37,8 @@ __C __export infiniStatus_t infiniopCreatePagedAttentionPrefillDescriptor(
     infiniopTensorDescriptor_t k_cache_desc,
     infiniopTensorDescriptor_t v_cache_desc,
     infiniopTensorDescriptor_t block_tables_desc,
-    infiniopTensorDescriptor_t cache_lens_desc,
-    infiniopTensorDescriptor_t seq_lens_desc,
-    infiniopTensorDescriptor_t offset_desc,
+    infiniopTensorDescriptor_t history_lens_desc,
+    infiniopTensorDescriptor_t cum_seq_lens_q_desc,
     infiniopTensorDescriptor_t alibi_slopes_desc,
     float scale);
 
@@ -52,11 +58,10 @@ __C __export infiniStatus_t infiniopGetPagedAttentionPrefillWorkspaceSize(
  * @param k_cache Pointer to the global key cache data.
  * @param v_cache Pointer to the global value cache data.
  * @param block_tables Pointer to the block tables data.
- * @param cache_lens Pointer to the total sequence lengths data.
- * @param seq_lens Pointer to the current prefill sequence lengths data.
- * @param offset Pointer to the sequence start offsets data.
+ * @param history_lens Pointer to the KV history lengths data.
+ * @param cum_seq_lens_q Pointer to the Q cumulative sequence lengths data (prefix sum).
  * @param alibi_slopes Pointer to the ALiBi slopes data. Can be NULL.
- * @param stream The CUDA/device stream for the operation.
+ * @param stream The device stream (e.g., cudaStream_t) for the operation.
  * @return infiniStatus_t Status code of the operation.
  */
 __C __export infiniStatus_t infiniopPagedAttentionPrefill(
@@ -68,9 +73,8 @@ __C __export infiniStatus_t infiniopPagedAttentionPrefill(
     const void *k_cache,
     const void *v_cache,
     const void *block_tables,
-    const void *cache_lens,
-    const void *seq_lens,
-    const void *offset,
+    const void *history_lens,
+    const void *cum_seq_lens_q,
     const void *alibi_slopes,
     void *stream);
 

python/infinicore/ops/paged_attention_prefill.py

@@ -7,14 +7,15 @@ def paged_attention_prefill(
     k_cache: Tensor,
     v_cache: Tensor,
     block_tables: Tensor,
-    cache_lens: Tensor,
-    seq_lens: Tensor,
-    seq_offsets: Tensor,
+    history_lens: Tensor,
+    cu_seqlens_q: Tensor,
     alibi_slopes: Tensor | None = None,
     scale: float = 1.0,
     *,
     out: Tensor | None = None,
 ):
+    alibi_ptr = alibi_slopes._underlying if alibi_slopes is not None else None
+
     if out is None:
         return Tensor(
             _infinicore.paged_attention_prefill(
@@ -22,10 +23,9 @@ def paged_attention_prefill(
                 k_cache._underlying,
                 v_cache._underlying,
                 block_tables._underlying,
-                cache_lens._underlying,
-                seq_lens._underlying,
-                seq_offsets._underlying,
-                alibi_slopes._underlying if alibi_slopes is not None else None,
+                history_lens._underlying,
+                cu_seqlens_q._underlying,
+                alibi_ptr,
                 scale,
             )
         )
@@ -36,10 +36,9 @@ def paged_attention_prefill(
         k_cache._underlying,
         v_cache._underlying,
         block_tables._underlying,
-        cache_lens._underlying,
-        seq_lens._underlying,
-        seq_offsets._underlying,
-        alibi_slopes._underlying if alibi_slopes is not None else None,
+        history_lens._underlying,
+        cu_seqlens_q._underlying,
+        alibi_ptr,
         scale,
     )
 

src/infinicore/ops/paged_attention_prefill/paged_attention_prefill.cc

@@ -9,20 +9,32 @@ common::OpDispatcher<PagedAttentionPrefill::schema> &PagedAttentionPrefill::disp
     return dispatcher_;
 };
 
-void PagedAttentionPrefill::execute(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float scale) {
-    INFINICORE_ASSERT_TENSORS_SAME_DEVICE(out, q, k_cache, v_cache, block_tables, cache_lens);
+void PagedAttentionPrefill::execute(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache,
+                                    Tensor block_tables, Tensor history_lens, Tensor cu_seqlens_q,
+                                    std::optional<Tensor> alibi_slopes, float scale) {
+
+    INFINICORE_ASSERT_TENSORS_SAME_DEVICE(out, q, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q);
+
     infinicore::context::setDevice(out->device());
-    dispatcher().lookup(out->device().getType())(out, q, k_cache, v_cache, block_tables, cache_lens, seq_lens, seq_offsets, alibi_slopes, scale);
+
+    dispatcher().lookup(out->device().getType())(out, q, k_cache, v_cache, block_tables,
+                                                 history_lens, cu_seqlens_q, alibi_slopes, scale);
 }
 
-Tensor paged_attention_prefill(Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float scale) {
+Tensor paged_attention_prefill(Tensor q, Tensor k_cache, Tensor v_cache,
+                               Tensor block_tables, Tensor history_lens, Tensor cu_seqlens_q,
+                               std::optional<Tensor> alibi_slopes, float scale) {
+
     auto out = Tensor::empty(q->shape(), q->dtype(), q->device());
-    paged_attention_prefill_(out, q, k_cache, v_cache, block_tables, cache_lens, seq_lens, seq_offsets, alibi_slopes, scale);
+    paged_attention_prefill_(out, q, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, alibi_slopes, scale);
     return out;
 }
 
-void paged_attention_prefill_(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float scale) {
-    PagedAttentionPrefill::execute(out, q, k_cache, v_cache, block_tables, cache_lens, seq_lens, seq_offsets, alibi_slopes, scale);
+void paged_attention_prefill_(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache,
+                              Tensor block_tables, Tensor history_lens, Tensor cu_seqlens_q,
+                              std::optional<Tensor> alibi_slopes, float scale) {
+
+    PagedAttentionPrefill::execute(out, q, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, alibi_slopes, scale);
 }
 
 } // namespace infinicore::op

src/infinicore/ops/paged_attention_prefill/paged_attention_prefill_infiniop.cc

@@ -15,8 +15,11 @@ thread_local common::OpCache<size_t, infiniopPagedAttentionPrefillDescriptor_t>
         }
     });
 
-void calculate(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor block_tables, Tensor cache_lens, Tensor seq_lens, Tensor seq_offsets, std::optional<Tensor> alibi_slopes, float scale) {
-    size_t seed = hash_combine(out, q, k_cache, v_cache, block_tables, cache_lens, seq_lens, seq_offsets, alibi_slopes, scale);
+void calculate(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache,
+               Tensor block_tables, Tensor history_lens, Tensor cu_seqlens_q,
+               std::optional<Tensor> alibi_slopes, float scale) {
+
+    size_t seed = hash_combine(out, q, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, alibi_slopes, scale);
 
     auto device = context::getDevice();
     auto &cache = caches.getCache(device);
@@ -27,8 +30,13 @@ void calculate(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor bloc
     if (!desc_opt) {
         INFINICORE_CHECK_ERROR(infiniopCreatePagedAttentionPrefillDescriptor(
             context::getInfiniopHandle(device), &desc,
-            out->desc(), q->desc(), k_cache->desc(), v_cache->desc(), block_tables->desc(),
-            cache_lens->desc(), seq_lens->desc(), seq_offsets->desc(),
+            out->desc(),
+            q->desc(),
+            k_cache->desc(),
+            v_cache->desc(),
+            block_tables->desc(),
+            history_lens->desc(),
+            cu_seqlens_q->desc(),
             alibi_slopes.has_value() ? alibi_slopes.value()->desc() : nullptr,
             scale));
         cache.put(seed, desc);
@@ -41,8 +49,16 @@ void calculate(Tensor out, Tensor q, Tensor k_cache, Tensor v_cache, Tensor bloc
     std::shared_ptr<Memory> workspace = context::allocateMemory(workspace_size);
 
     INFINICORE_CHECK_ERROR(infiniopPagedAttentionPrefill(
-        desc, workspace->data(), workspace_size,
-        out->data(), q->data(), k_cache->data(), v_cache->data(), block_tables->data(), cache_lens->data(), seq_lens->data(), seq_offsets->data(),
+        desc,
+        workspace->data(),
+        workspace_size,
+        out->data(),
+        q->data(),
+        k_cache->data(),
+        v_cache->data(),
+        block_tables->data(),
+        history_lens->data(),
+        cu_seqlens_q->data(),
         alibi_slopes.has_value() ? alibi_slopes.value()->data() : nullptr,
         context::getStream()));
 }

src/infinicore/pybind11/ops.hpp

@@ -11,6 +11,7 @@
 #include "ops/matmul.hpp"
 #include "ops/mul.hpp"
 #include "ops/paged_attention.hpp"
+#include "ops/paged_attention_prefill.hpp"
 #include "ops/paged_caching.hpp"
 #include "ops/random_sample.hpp"
 #include "ops/rearrange.hpp"
@@ -33,6 +34,7 @@ inline void bind(py::module &m) {
     bind_matmul(m);
     bind_mul(m);
     bind_paged_attention(m);
+    bind_paged_attention_prefill(m);
     bind_paged_caching(m);
     bind_rearrange(m);
     bind_rms_norm(m);

src/infinicore/pybind11/ops/paged_attention_prefill.hpp

+#pragma once
+
+#include "infinicore/ops/paged_attention_prefill.hpp"
+#include <pybind11/pybind11.h>
+
+namespace py = pybind11;
+
+namespace infinicore::ops {
+
+Tensor py_paged_attention_prefill(Tensor q,
+                                  Tensor k_cache,
+                                  Tensor v_cache,
+                                  Tensor block_tables,
+                                  Tensor history_lens,
+                                  Tensor cu_seqlens_q,
+                                  py::object alibi_slopes,
+                                  float scale) {
+    std::optional<Tensor> alibi_slopes_tensor = std::nullopt;
+    if (!alibi_slopes.is_none()) {
+        alibi_slopes_tensor = alibi_slopes.cast<Tensor>();
+    }
+    return op::paged_attention_prefill(q, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, alibi_slopes_tensor, scale);
+}
+
+void py_paged_attention_prefill_(Tensor out,
+                                 Tensor q,
+                                 Tensor k_cache,
+                                 Tensor v_cache,
+                                 Tensor block_tables,
+                                 Tensor history_lens,
+                                 Tensor cu_seqlens_q,
+                                 py::object alibi_slopes,
+                                 float scale) {
+    std::optional<Tensor> alibi_slopes_tensor = std::nullopt;
+    if (!alibi_slopes.is_none()) {
+        alibi_slopes_tensor = alibi_slopes.cast<Tensor>();
+    }
+    op::paged_attention_prefill_(out, q, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, alibi_slopes_tensor, scale);
+}
+
+inline void bind_paged_attention_prefill(py::module &m) {
+    m.def("paged_attention_prefill",
+          &ops::py_paged_attention_prefill,
+          py::arg("q"),
+          py::arg("k_cache"),
+          py::arg("v_cache"),
+          py::arg("block_tables"),
+          py::arg("history_lens"),
+          py::arg("cu_seqlens_q"),
+          py::arg("alibi_slopes") = py::none(),
+          py::arg("scale") = 1.0,
+          R"doc(Paged attention prefill for packed variable-length queries.)doc");
+
+    m.def("paged_attention_prefill_",
+          &ops::py_paged_attention_prefill_,
+          py::arg("out"),
+          py::arg("q"),
+          py::arg("k_cache"),
+          py::arg("v_cache"),
+          py::arg("block_tables"),
+          py::arg("history_lens"),
+          py::arg("cu_seqlens_q"),
+          py::arg("alibi_slopes") = py::none(),
+          py::arg("scale") = 1.0,
+          R"doc(In-place paged attention prefill for packed variable-length queries.)doc");
+}
+
+} // namespace infinicore::ops

src/infiniop/ops/paged_attention_prefill/cuda/kernel.cuh

@@ -3,14 +3,13 @@
 
 namespace op::paged_attention_prefill::cuda {
 
-// 辅助函数：二分查找确定当前 global_token_idx 属于哪个 sequence
-__device__ __forceinline__ size_t find_seq_id(size_t token_idx, const int64_t *offset, size_t num_seqs) {
+__device__ __forceinline__ size_t find_seq_id(size_t token_idx, const int64_t *cum_seq_lens_q, size_t num_seqs) {
     size_t low = 0, high = num_seqs - 1;
     while (low <= high) {
         size_t mid = (low + high) >> 1;
-        if (token_idx >= offset[mid] && token_idx < offset[mid + 1]) {
+        if (token_idx >= (size_t)cum_seq_lens_q[mid] && token_idx < (size_t)cum_seq_lens_q[mid + 1]) {
             return mid;
-        } else if (token_idx < offset[mid]) {
+        } else if (token_idx < (size_t)cum_seq_lens_q[mid]) {
             high = mid - 1;
         } else {
             low = mid + 1;
@@ -22,50 +21,43 @@ __device__ __forceinline__ size_t find_seq_id(size_t token_idx, const int64_t *o
 template <typename Tdata, typename Tcompute>
 __global__ void pagedAttentionPrefillKernel(
     Tdata *out_, const Tdata *q_, const Tdata *k_cache_, const Tdata *v_cache_,
-    const int64_t *block_tables_, const int64_t *cache_lens_, const int64_t *seq_lens_,
+    const int64_t *block_tables_,
+    const int64_t *history_lens_,
+    const int64_t *cum_seq_lens_q_,
     const float *alibi_slopes_,
     const size_t num_heads, const size_t num_kv_heads, const float scale,
     const size_t max_num_blocks_per_seq, const size_t block_size,
     const ptrdiff_t kv_block_stride, const ptrdiff_t kv_head_stride,
     const size_t head_size,
-    const int64_t *offset_,
     const size_t num_seqs) {
 
-    // --- 使用 2D Grid 坐标 ---
-    const size_t global_token_idx = blockIdx.x; // 展平后的全局 token 索引
-    const size_t head_idx = blockIdx.y;         // Head 索引
-    const size_t dim_idx = threadIdx.x;         // Head 内部维度
+    // Grid : x -> token, y -> head
+    const size_t global_token_idx = blockIdx.x;
+    const size_t head_idx = blockIdx.y;
+    const size_t dim_idx = threadIdx.x;
 
     if (dim_idx >= head_size) {
         return;
     }
 
-    // --- 通过二分查找 offset 找到所属的 seq_idx ---
-    size_t seq_idx = find_seq_id(global_token_idx, offset_, num_seqs);
+    size_t seq_idx = find_seq_id(global_token_idx, cum_seq_lens_q_, num_seqs);
 
-    // --- 获取该 Sequence 本次 Prefill 的长度
-    const int64_t cur_new_len = seq_lens_[seq_idx];
+    size_t q_token_idx = global_token_idx - cum_seq_lens_q_[seq_idx];
 
-    // --- 该 token 在当前序列中的相对位置
-    size_t q_token_idx = global_token_idx - offset_[seq_idx];
+    const int64_t history_len = history_lens_[seq_idx];
+    const int64_t causal_limit = history_len + q_token_idx;
 
-    const Tdata *q_ptr_base = q_ + global_token_idx * num_heads * head_size + head_idx * head_size;
+    const Tdata *q_vec = q_ + global_token_idx * num_heads * head_size + head_idx * head_size;
     Tdata *out_ptr = out_ + global_token_idx * num_heads * head_size + head_idx * head_size;
 
-    // --- KV Cache 相关信息
-    const int64_t total_seq_len = cache_lens_[seq_idx];
-    const int64_t history_len = total_seq_len - cur_new_len;
-    const int64_t causal_limit = history_len + q_token_idx;
-
     const size_t num_queries_per_kv = num_heads / num_kv_heads;
     const size_t kv_head_idx = head_idx / num_queries_per_kv;
     const int64_t *block_table = block_tables_ + seq_idx * max_num_blocks_per_seq;
 
     const float alibi_slope = (alibi_slopes_ == nullptr) ? 0.0f : alibi_slopes_[head_idx];
 
-    // Pass 1: 计算 Score 并找最大值
     Tcompute max_score = -FLT_MAX;
-    for (size_t t = 0; t <= causal_limit; ++t) {
+    for (int64_t t = 0; t <= causal_limit; ++t) {
         const int64_t b_idx = t / block_size;
         const int64_t t_off = t % block_size;
         const int64_t physical_block_id = block_table[b_idx];
@@ -73,7 +65,7 @@ __global__ void pagedAttentionPrefillKernel(
 
         Tcompute score = 0.0f;
         for (size_t d = 0; d < head_size; ++d) {
-            score += static_cast<Tcompute>(q_ptr_base[d]) * static_cast<Tcompute>(k_vec[d]);
+            score += static_cast<Tcompute>(q_vec[d]) * static_cast<Tcompute>(k_vec[d]);
         }
         score *= static_cast<Tcompute>(scale);
         if (alibi_slope != 0.0f) {
@@ -84,9 +76,8 @@ __global__ void pagedAttentionPrefillKernel(
         }
     }
 
-    // Pass 2: 计算 Sum of Exp
     Tcompute sum_exp = 0.0f;
-    for (size_t t = 0; t <= causal_limit; ++t) {
+    for (int64_t t = 0; t <= causal_limit; ++t) {
         const int64_t b_idx = t / block_size;
         const int64_t t_off = t % block_size;
         const int64_t physical_block_id = block_table[b_idx];
@@ -94,7 +85,7 @@ __global__ void pagedAttentionPrefillKernel(
 
         Tcompute score = 0.0f;
         for (size_t d = 0; d < head_size; ++d) {
-            score += static_cast<Tcompute>(q_ptr_base[d]) * static_cast<Tcompute>(k_vec[d]);
+            score += static_cast<Tcompute>(q_vec[d]) * static_cast<Tcompute>(k_vec[d]);
         }
         score *= static_cast<Tcompute>(scale);
         if (alibi_slope != 0.0f) {
@@ -103,10 +94,9 @@ __global__ void pagedAttentionPrefillKernel(
         sum_exp += expf(static_cast<float>(score - max_score));
     }
 
-    // Pass 3: 加权求和得到输出
     Tcompute acc = 0.0f;
     Tcompute inv_sum = 1.0f / (sum_exp + 1e-6f);
-    for (size_t t = 0; t <= causal_limit; ++t) {
+    for (int64_t t = 0; t <= causal_limit; ++t) {
         const int64_t b_idx = t / block_size;
         const int64_t t_off = t % block_size;
         const int64_t physical_block_id = block_table[b_idx];
@@ -114,7 +104,7 @@ __global__ void pagedAttentionPrefillKernel(
         const Tdata *k_vec = k_cache_ + physical_block_id * kv_block_stride + kv_head_idx * kv_head_stride + t_off * head_size;
         Tcompute score = 0.0f;
         for (size_t d = 0; d < head_size; ++d) {
-            score += static_cast<Tcompute>(q_ptr_base[d]) * static_cast<Tcompute>(k_vec[d]);
+            score += static_cast<Tcompute>(q_vec[d]) * static_cast<Tcompute>(k_vec[d]);
         }
         score *= static_cast<Tcompute>(scale);
         if (alibi_slope != 0.0f) {

src/infiniop/ops/paged_attention_prefill/info.h

-#ifndef __PAGED_ATTENTION_PREFILL_INFO_H__
-#define __PAGED_ATTENTION_PREFILL_INFO_H__
+#ifndef __INFINIOP_PAGED_ATTENTION_PREFILL_INFO_H__
+#define __INFINIOP_PAGED_ATTENTION_PREFILL_INFO_H__
 
 #include "../../../utils.h"
 #include "../../tensor.h"
@@ -35,9 +35,8 @@ public:
         infiniopTensorDescriptor_t k_cache_desc,
         infiniopTensorDescriptor_t v_cache_desc,
         infiniopTensorDescriptor_t block_tables_desc,
-        infiniopTensorDescriptor_t cache_lens_desc,
-        infiniopTensorDescriptor_t seq_lens_desc,
-        infiniopTensorDescriptor_t offset_desc,
+        infiniopTensorDescriptor_t history_lens_desc,
+        infiniopTensorDescriptor_t cum_seq_lens_q_desc,
         const std::optional<infiniopTensorDescriptor_t> &alibi_slopes_desc,
         float scale) {
 
@@ -47,39 +46,54 @@ public:
         if (out_desc->dtype() != dtype || k_cache_desc->dtype() != dtype || v_cache_desc->dtype() != dtype) {
             return INFINI_STATUS_BAD_TENSOR_DTYPE;
         }
-        if (offset_desc->dtype() != INFINI_DTYPE_I64 || seq_lens_desc->dtype() != INFINI_DTYPE_I64) {
+
+        if (cum_seq_lens_q_desc->dtype() != INFINI_DTYPE_I64 || history_lens_desc->dtype() != INFINI_DTYPE_I64) {
             return INFINI_STATUS_BAD_TENSOR_DTYPE;
         }
 
         if (alibi_slopes_desc.has_value() && alibi_slopes_desc.value() != nullptr) {
-            std::cerr << "[Error] PagedAttentionPrefill: ALiBi slopes are not supported yet." << std::endl;
+        }
+
+        auto k_shape = k_cache_desc->shape();
+        auto v_shape = v_cache_desc->shape();
+        auto block_tables_shape = block_tables_desc->shape();
+        auto history_lens_shape = history_lens_desc->shape();
+        auto cum_seq_lens_q_shape = cum_seq_lens_q_desc->shape();
+
+        if (k_shape.size() != 4 || v_shape.size() != 4) {
+            return INFINI_STATUS_BAD_TENSOR_SHAPE;
+        }
+
+        if (block_tables_shape.size() != 2) {
+            return INFINI_STATUS_BAD_TENSOR_SHAPE;
+        }
+
+        if (history_lens_shape.size() != 1 || cum_seq_lens_q_shape.size() != 1) {
+            return INFINI_STATUS_BAD_TENSOR_SHAPE;
+        }
+        if (cum_seq_lens_q_shape[0] != history_lens_shape[0] + 1) {
             return INFINI_STATUS_BAD_PARAM;
         }
 
-        // Q shape: [total_tokens, heads, dim] (3D)
+        // Q shape: [total_tokens, heads, dim]
         auto q_shape = q_desc->shape();
-        if (q_shape.size() < 3) {
+        if (q_shape.size() != 3) {
             return INFINI_STATUS_BAD_TENSOR_SHAPE;
         }
         size_t total_q_tokens = q_shape[0];
+        size_t num_heads = q_shape[1];
+        size_t head_size = q_shape[2];
 
-        size_t num_heads = q_shape[q_shape.size() - 2];
-        size_t head_size = q_shape[q_shape.size() - 1];
-
-        if (head_size != 128) {
-            std::cerr << "[Error] PagedAttentionPrefill head_size = 128 supported, got " << head_size << std::endl;
-            return INFINI_STATUS_BAD_TENSOR_SHAPE;
+        if (head_size > 1024) {
+            return INFINI_STATUS_BAD_PARAM;
         }
 
-        // 从 seq_lens 获取 num_seqs
-        size_t num_seqs = seq_lens_desc->shape()[0];
+        size_t num_seqs = history_lens_shape[0];
 
-        auto k_cache_shape = k_cache_desc->shape();
-        size_t num_kv_heads = k_cache_shape[1];
-        size_t block_size = v_cache_desc->shape()[2];
-        size_t max_num_blocks_per_seq = block_tables_desc->shape()[1];
+        size_t num_kv_heads = k_shape[1];
+        size_t block_size = k_shape[2];
+        size_t max_num_blocks_per_seq = block_tables_shape[1];
 
-        // 提取步长,需要保持多个请求的 Q 连续
         ptrdiff_t q_stride = q_desc->stride(0);
         ptrdiff_t kv_block_stride = k_cache_desc->stride(0);
         ptrdiff_t kv_head_stride = k_cache_desc->stride(1);

src/infiniop/ops/paged_attention_prefill/nvidia/paged_attention_prefill_nvidia.cu

@@ -8,14 +8,12 @@
 #include "../cuda/kernel.cuh"
 #include "paged_attention_prefill_nvidia.cuh"
 
-// ==============================================================================
-// Host wrapper to launch the global kernel
-// ==============================================================================
 template <typename Tdata, typename Tcompute>
 infiniStatus_t launchPagedAttentionPrefill(
     Tdata *out, const Tdata *q, const Tdata *k_cache, const Tdata *v_cache,
-    const int64_t *block_tables, const int64_t *cache_lens, const int64_t *seq_lens,
-    const int64_t *offset,
+    const int64_t *block_tables,
+    const int64_t *history_lens,
+    const int64_t *cum_seq_lens_q,
     const float *alibi_slopes,
     const size_t num_heads,
     const size_t num_seqs,
@@ -24,36 +22,27 @@ infiniStatus_t launchPagedAttentionPrefill(
     const size_t max_num_blocks_per_seq,
     const size_t block_size,
     const size_t total_q_tokens,
-    const ptrdiff_t q_stride,
+    const size_t head_size,
     const ptrdiff_t kv_block_stride,
     const ptrdiff_t kv_head_stride,
-    const ptrdiff_t o_stride,
-    const size_t head_size,
     cudaStream_t stream) {
 
     if (total_q_tokens == 0 || num_heads == 0) {
         return INFINI_STATUS_BAD_TENSOR_SHAPE;
     }
 
-    // 使用 2D Grid: X轴是所有 Token，Y轴是所有 Head
     dim3 grid(total_q_tokens, num_heads);
     dim3 block(head_size);
 
     op::paged_attention_prefill::cuda::pagedAttentionPrefillKernel<Tdata, Tcompute>
         <<<grid, block, 0, stream>>>(
             out, q, k_cache, v_cache,
-            block_tables, cache_lens, seq_lens, alibi_slopes,
+            block_tables, history_lens, cum_seq_lens_q, alibi_slopes,
             num_heads, num_kv_heads, scale,
             max_num_blocks_per_seq, block_size,
             kv_block_stride, kv_head_stride,
             head_size,
-            offset, num_seqs);
-
-    cudaError_t err = cudaGetLastError();
-    if (err != cudaSuccess) {
-        std::cerr << "CUDA Kernel Launch Failed: " << cudaGetErrorString(err) << std::endl;
-        return INFINI_STATUS_INTERNAL_ERROR;
-    }
+            num_seqs);
 
     return INFINI_STATUS_SUCCESS;
 }
@@ -76,16 +65,17 @@ infiniStatus_t Descriptor::create(
     infiniopTensorDescriptor_t k_cache_desc,
     infiniopTensorDescriptor_t v_cache_desc,
     infiniopTensorDescriptor_t block_tables_desc,
-    infiniopTensorDescriptor_t cache_lens_desc,
-    infiniopTensorDescriptor_t seq_lens_desc,
-    infiniopTensorDescriptor_t offset_desc,
+    infiniopTensorDescriptor_t history_lens_desc,
+    infiniopTensorDescriptor_t cum_seq_lens_q_desc,
     const std::optional<infiniopTensorDescriptor_t> &alibi_slopes_desc,
     float scale) {
 
-    auto info = PagedAttentionPrefillInfo::create(out_desc, q_desc, k_cache_desc, v_cache_desc,
-                                                  block_tables_desc, cache_lens_desc, seq_lens_desc,
-                                                  offset_desc,
-                                                  alibi_slopes_desc, scale);
+    auto info = PagedAttentionPrefillInfo::create(
+        out_desc, q_desc, k_cache_desc, v_cache_desc,
+        block_tables_desc, history_lens_desc,
+        cum_seq_lens_q_desc,
+        alibi_slopes_desc, scale);
+
     CHECK_RESULT(info);
 
     *desc_ptr = new Descriptor(
@@ -98,28 +88,24 @@ infiniStatus_t Descriptor::create(
 infiniStatus_t Descriptor::calculate(
     void *workspace, size_t workspace_size,
     void *out, const void *q, const void *k_cache, const void *v_cache,
-    const void *block_tables, const void *cache_lens, const void *seq_lens,
-    const void *offset,
+    const void *block_tables,
+    const void *history_lens,
+    const void *cum_seq_lens_q,
     const void *alibi_slopes,
     void *stream_) const {
 
     cudaStream_t stream = (cudaStream_t)stream_;
 
-    if (_info.head_size > 1024) {
-        return INFINI_STATUS_BAD_TENSOR_SHAPE;
-    }
-
-#define LAUNCH_KERNEL(Tdata, Tcompute)                                                         \
-    launchPagedAttentionPrefill<Tdata, Tcompute>(                                              \
-        (Tdata *)out, (const Tdata *)q, (const Tdata *)k_cache, (const Tdata *)v_cache,        \
-        (const int64_t *)block_tables, (const int64_t *)cache_lens, (const int64_t *)seq_lens, \
-        (const int64_t *)offset,                                                               \
-        (const float *)alibi_slopes,                                                           \
-        _info.num_heads, _info.num_seqs, _info.num_kv_heads,                                   \
-        _info.scale, _info.max_num_blocks_per_seq,                                             \
-        _info.block_size, _info.total_q_tokens,                                                \
-        _info.q_stride, _info.kv_block_stride, _info.kv_head_stride, _info.o_stride,           \
-        _info.head_size,                                                                       \
+#define LAUNCH_KERNEL(Tdata, Tcompute)                                                                 \
+    launchPagedAttentionPrefill<Tdata, Tcompute>(                                                      \
+        (Tdata *)out, (const Tdata *)q, (const Tdata *)k_cache, (const Tdata *)v_cache,                \
+        (const int64_t *)block_tables, (const int64_t *)history_lens, (const int64_t *)cum_seq_lens_q, \
+        (const float *)alibi_slopes,                                                                   \
+        _info.num_heads, _info.num_seqs, _info.num_kv_heads,                                           \
+        _info.scale, _info.max_num_blocks_per_seq,                                                     \
+        _info.block_size, _info.total_q_tokens,                                                        \
+        _info.head_size,                                                                               \
+        _info.kv_block_stride, _info.kv_head_stride,                                                   \
         stream)
 
     if (_info.dtype == INFINI_DTYPE_F16) {

src/infiniop/ops/paged_attention_prefill/operator.cc

@@ -14,9 +14,8 @@ __C infiniStatus_t infiniopCreatePagedAttentionPrefillDescriptor(
     infiniopTensorDescriptor_t k_cache_desc,
     infiniopTensorDescriptor_t v_cache_desc,
     infiniopTensorDescriptor_t block_tables_desc,
-    infiniopTensorDescriptor_t cache_lens_desc,
-    infiniopTensorDescriptor_t seq_lens_desc,
-    infiniopTensorDescriptor_t offset_desc,
+    infiniopTensorDescriptor_t history_lens_desc,
+    infiniopTensorDescriptor_t cum_seq_lens_q_desc,
     infiniopTensorDescriptor_t alibi_slopes_desc,
     float scale) {
 
@@ -27,8 +26,8 @@ __C infiniStatus_t infiniopCreatePagedAttentionPrefillDescriptor(
         return op::paged_attention_prefill::NAMESPACE::Descriptor::create(                     \
             handle,                                                                            \
             reinterpret_cast<op::paged_attention_prefill::NAMESPACE::Descriptor **>(desc_ptr), \
-            out_desc, q_desc, k_cache_desc, v_cache_desc, block_tables_desc, cache_lens_desc,  \
-            seq_lens_desc, offset_desc, alibi_opt, scale);
+            out_desc, q_desc, k_cache_desc, v_cache_desc, block_tables_desc,                   \
+            history_lens_desc, cum_seq_lens_q_desc, alibi_opt, scale);
 
     switch (handle->device) {
 #ifdef ENABLE_NVIDIA_API
@@ -59,8 +58,9 @@ __C infiniStatus_t infiniopPagedAttentionPrefill(
     infiniopPagedAttentionPrefillDescriptor_t desc,
     void *workspace, size_t workspace_size,
     void *out, const void *q, const void *k_cache, const void *v_cache,
-    const void *block_tables, const void *cache_lens, const void *seq_lens,
-    const void *offset,
+    const void *block_tables,
+    const void *history_lens,
+    const void *cum_seq_lens_q,
     const void *alibi_slopes,
     void *stream) {
 
@@ -68,7 +68,7 @@ __C infiniStatus_t infiniopPagedAttentionPrefill(
     case CASE:                                                                                          \
         return reinterpret_cast<op::paged_attention_prefill::NAMESPACE::Descriptor *>(desc)->calculate( \
             workspace, workspace_size, out, q, k_cache, v_cache, block_tables,                          \
-            cache_lens, seq_lens, offset, alibi_slopes, stream);
+            history_lens, cum_seq_lens_q, alibi_slopes, stream);
 
     switch (desc->device_type) {
 #ifdef ENABLE_NVIDIA_API

src/infiniop/ops/paged_attention_prefill/paged_attention_prefill.h

@@ -4,53 +4,53 @@
 #include "../../operator.h"
 #include "info.h"
 
-#define DESCRIPTOR(NAMESPACE)                                                       \
-                                                                                    \
-    namespace op::paged_attention_prefill::NAMESPACE {                              \
-    class Descriptor final : public InfiniopDescriptor {                            \
-        struct Opaque;                                                              \
-        Opaque *_opaque;                                                            \
-        PagedAttentionPrefillInfo _info;                                            \
-        size_t _workspace_size;                                                     \
-                                                                                    \
-        Descriptor(                                                                 \
-            Opaque *opaque,                                                         \
-            PagedAttentionPrefillInfo info,                                         \
-            size_t workspace_size,                                                  \
-            infiniDevice_t device_type,                                             \
-            int device_id)                                                          \
-            : InfiniopDescriptor{device_type, device_id},                           \
-              _opaque(opaque),                                                      \
-              _info(info),                                                          \
-              _workspace_size(workspace_size) {}                                    \
-                                                                                    \
-    public:                                                                         \
-        ~Descriptor();                                                              \
-                                                                                    \
-        size_t workspaceSize() const { return _workspace_size; }                    \
-                                                                                    \
-        static infiniStatus_t create(                                               \
-            infiniopHandle_t handle,                                                \
-            Descriptor **desc_ptr,                                                  \
-            infiniopTensorDescriptor_t out_desc,                                    \
-            infiniopTensorDescriptor_t q_desc,                                      \
-            infiniopTensorDescriptor_t k_cache_desc,                                \
-            infiniopTensorDescriptor_t v_cache_desc,                                \
-            infiniopTensorDescriptor_t block_tables_desc,                           \
-            infiniopTensorDescriptor_t cache_lens_desc,                             \
-            infiniopTensorDescriptor_t seq_lens_desc,                               \
-            infiniopTensorDescriptor_t offset_desc,                                 \
-            const std::optional<infiniopTensorDescriptor_t> &alibi_slopes_desc,     \
-            float scale);                                                           \
-                                                                                    \
-        infiniStatus_t calculate(                                                   \
-            void *workspace, size_t workspace_size,                                 \
-            void *out, const void *q, const void *k_cache, const void *v_cache,     \
-            const void *block_tables, const void *cache_lens, const void *seq_lens, \
-            const void *offset,                                                     \
-            const void *alibi_slopes,                                               \
-            void *stream) const;                                                    \
-    };                                                                              \
+#define DESCRIPTOR(NAMESPACE)                                                   \
+                                                                                \
+    namespace op::paged_attention_prefill::NAMESPACE {                          \
+    class Descriptor final : public InfiniopDescriptor {                        \
+        struct Opaque;                                                          \
+        Opaque *_opaque;                                                        \
+        PagedAttentionPrefillInfo _info;                                        \
+        size_t _workspace_size;                                                 \
+                                                                                \
+        Descriptor(                                                             \
+            Opaque *opaque,                                                     \
+            PagedAttentionPrefillInfo info,                                     \
+            size_t workspace_size,                                              \
+            infiniDevice_t device_type,                                         \
+            int device_id)                                                      \
+            : InfiniopDescriptor{device_type, device_id},                       \
+              _opaque(opaque),                                                  \
+              _info(info),                                                      \
+              _workspace_size(workspace_size) {}                                \
+                                                                                \
+    public:                                                                     \
+        ~Descriptor();                                                          \
+                                                                                \
+        size_t workspaceSize() const { return _workspace_size; }                \
+                                                                                \
+        static infiniStatus_t create(                                           \
+            infiniopHandle_t handle,                                            \
+            Descriptor **desc_ptr,                                              \
+            infiniopTensorDescriptor_t out_desc,                                \
+            infiniopTensorDescriptor_t q_desc,                                  \
+            infiniopTensorDescriptor_t k_cache_desc,                            \
+            infiniopTensorDescriptor_t v_cache_desc,                            \
+            infiniopTensorDescriptor_t block_tables_desc,                       \
+            infiniopTensorDescriptor_t history_lens_desc,                       \
+            infiniopTensorDescriptor_t cum_seq_lens_q_desc,                     \
+            const std::optional<infiniopTensorDescriptor_t> &alibi_slopes_desc, \
+            float scale);                                                       \
+                                                                                \
+        infiniStatus_t calculate(                                               \
+            void *workspace, size_t workspace_size,                             \
+            void *out, const void *q, const void *k_cache, const void *v_cache, \
+            const void *block_tables,                                           \
+            const void *history_lens,                                           \
+            const void *cum_seq_lens_q,                                         \
+            const void *alibi_slopes,                                           \
+            void *stream) const;                                                \
+    };                                                                          \
     }
 
 #endif // PAGED_ATTENTION_PREFILL_H

test/infinicore/ops/paged_attention_prefill.py

+import sys
+import os
+import torch
+import infinicore
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+
+from framework import (
+    BaseOperatorTest,
+    TensorSpec,
+    TestCase,
+    GenericTestRunner,
+    TensorInitializer,
+)
+
+# Test Cases: (num_seqs, num_heads, num_kv_heads, head_size, block_size, max_step_len, num_rounds)
+_TEST_CASES_DATA = [
+    (1, 1, 1, 128, 8, 16, 1),
+    (1, 4, 4, 128, 8, 16, 4),
+    (2, 8, 8, 128, 16, 32, 2),
+    (4, 16, 16, 128, 8, 64, 3),
+    (8, 64, 64, 128, 8, 16, 5),
+]
+
+_TOLERANCE_MAP = {
+    infinicore.float16: {"atol": 1e-2, "rtol": 1e-2},
+    infinicore.float32: {"atol": 1e-4, "rtol": 1e-4},  # float32 调优容限
+    infinicore.bfloat16: {"atol": 2e-2, "rtol": 2e-2},
+}
+
+_TENSOR_DTYPES = [infinicore.float16, infinicore.bfloat16, infinicore.float32]
+
+
+class SimpleCacheManager:
+    def __init__(self, num_blocks, block_size):
+        self.num_blocks = num_blocks
+        self.block_size = block_size
+        self.free_blocks = list(range(num_blocks))
+        self.request_to_blocks = {}
+        self.request_to_len = {}
+
+    def allocate_slots(self, request_id, num_new_tokens):
+        if request_id not in self.request_to_len:
+            self.request_to_len[request_id] = 0
+            self.request_to_blocks[request_id] = []
+
+        start_pos = self.request_to_len[request_id]
+        new_total_len = start_pos + num_new_tokens
+        needed_blocks = (new_total_len + self.block_size - 1) // self.block_size
+        added_blocks = needed_blocks - len(self.request_to_blocks[request_id])
+
+        for _ in range(added_blocks):
+            self.request_to_blocks[request_id].append(self.free_blocks.pop(0))
+
+        self.request_to_len[request_id] = new_total_len
+        return self.request_to_blocks[request_id], new_total_len
+
+
+def parse_test_cases():
+    test_cases = []
+
+    for (
+        num_seqs,
+        num_heads,
+        num_kv_heads,
+        head_size,
+        block_size,
+        max_step_len,
+        num_rounds,
+    ) in _TEST_CASES_DATA:
+        scale = head_size**-0.5
+        num_blocks = 8192
+        manager = SimpleCacheManager(num_blocks, block_size)
+        current_history_lens = torch.zeros(num_seqs, dtype=torch.int64)
+
+        persistent_k = torch.zeros((num_blocks, num_kv_heads, block_size, head_size))
+        persistent_v = torch.zeros((num_blocks, num_kv_heads, block_size, head_size))
+
+        for r in range(num_rounds):
+            q_lens = torch.randint(1, max_step_len + 1, (num_seqs,), dtype=torch.int64)
+            total_q_tokens = q_lens.sum().item()
+            cu_seqlens_q = torch.zeros(num_seqs + 1, dtype=torch.int64)
+            cu_seqlens_q[1:] = torch.cumsum(q_lens, dim=0)
+
+            query_base = torch.randn((total_q_tokens, num_heads, head_size))
+
+            round_block_tables_list = []
+            for i in range(num_seqs):
+                p_blocks, total_len = manager.allocate_slots(i, q_lens[i].item())
+                round_block_tables_list.append(p_blocks)
+
+                h_len = current_history_lens[i].item()
+                q_start = cu_seqlens_q[i].item()
+
+                for t in range(q_lens[i].item()):
+                    logical_pos = h_len + t
+                    b_id = p_blocks[logical_pos // block_size]
+                    off = logical_pos % block_size
+                    persistent_k[b_id, :, off, :] = torch.randn(num_kv_heads, head_size)
+                    persistent_v[b_id, :, off, :] = torch.randn(num_kv_heads, head_size)
+
+            max_blks = max(len(t) for t in round_block_tables_list)
+            padded_tables = torch.tensor(
+                [t + [0] * (max_blks - len(t)) for t in round_block_tables_list]
+            )
+
+            for dtype in _TENSOR_DTYPES:
+                tolerance = _TOLERANCE_MAP.get(dtype)
+
+                test_cases.append(
+                    TestCase(
+                        inputs=[
+                            TensorSpec.from_tensor(
+                                query_base.shape,
+                                init_mode=TensorInitializer.MANUAL,
+                                set_tensor=query_base.clone(),
+                                dtype=dtype,
+                            ),
+                            TensorSpec.from_tensor(
+                                persistent_k.shape,
+                                init_mode=TensorInitializer.MANUAL,
+                                set_tensor=persistent_k.clone(),
+                                dtype=dtype,
+                            ),
+                            TensorSpec.from_tensor(
+                                persistent_v.shape,
+                                init_mode=TensorInitializer.MANUAL,
+                                set_tensor=persistent_v.clone(),
+                                dtype=dtype,
+                            ),
+                            TensorSpec.from_tensor(
+                                padded_tables.shape,
+                                init_mode=TensorInitializer.MANUAL,
+                                set_tensor=padded_tables.clone(),
+                                dtype=infinicore.int64,
+                            ),
+                            TensorSpec.from_tensor(
+                                current_history_lens.shape,
+                                init_mode=TensorInitializer.MANUAL,
+                                set_tensor=current_history_lens.clone(),
+                                dtype=infinicore.int64,
+                            ),
+                            TensorSpec.from_tensor(
+                                cu_seqlens_q.shape,
+                                init_mode=TensorInitializer.MANUAL,
+                                set_tensor=cu_seqlens_q.clone(),
+                                dtype=infinicore.int64,
+                            ),
+                        ],
+                        kwargs={"scale": scale},
+                        tolerance=tolerance,
+                        description=f"PagedAttentionPrefill_Round_{r}_{str(dtype).split('.')[-1]}",
+                    )
+                )
+
+            current_history_lens += q_lens
+
+    return test_cases
+
+
+def ref_paged_attention_multi_turn(
+    query, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, scale
+):
+    output = torch.zeros_like(query)
+    num_seqs = len(history_lens)
+    block_size = k_cache.shape[2]
+
+    for i in range(num_seqs):
+        q_start, q_end = cu_seqlens_q[i].item(), cu_seqlens_q[i + 1].item()
+        cur_q = query[q_start:q_end]
+        h_len = history_lens[i].item()
+        q_len = q_end - q_start
+        total_len = h_len + q_len
+
+        table = block_tables[i]
+        keys, values = [], []
+        for j in range(total_len):
+            b_id = table[j // block_size].item()
+            off = j % block_size
+            keys.append(k_cache[b_id, :, off, :])
+            values.append(v_cache[b_id, :, off, :])
+
+        K = torch.stack(keys, dim=0)
+        V = torch.stack(values, dim=0)
+
+        scores = torch.einsum("qhd,khd->hqk", cur_q.float(), K.float()) * scale
+        mask = torch.full((q_len, total_len), float("-inf"), device=query.device)
+        for t in range(q_len):
+            mask[t, : h_len + t + 1] = 0.0
+
+        attn = torch.softmax(scores + mask.unsqueeze(0), dim=-1).to(query.dtype)
+        output[q_start:q_end] = torch.einsum("hqk,khd->qhd", attn, V)
+    return output
+
+
+class OpTest(BaseOperatorTest):
+    def __init__(self):
+        super().__init__("PagedAttentionPrefill")
+
+    def get_test_cases(self):
+        return parse_test_cases()
+
+    def torch_operator(
+        self,
+        query,
+        k_cache,
+        v_cache,
+        block_tables,
+        history_lens,
+        cu_seqlens_q,
+        scale=1.0,
+    ):
+        return ref_paged_attention_multi_turn(
+            query, k_cache, v_cache, block_tables, history_lens, cu_seqlens_q, scale
+        )
+
+    def infinicore_operator(
+        self,
+        query,
+        k_cache,
+        v_cache,
+        block_tables,
+        history_lens,
+        cu_seqlens_q,
+        scale=1.0,
+    ):
+        out = infinicore.paged_attention_prefill(
+            query,
+            k_cache,
+            v_cache,
+            block_tables,
+            history_lens,
+            cu_seqlens_q,
+            alibi_slopes=None,
+            scale=scale,
+        )
+        infinicore.sync_stream()
+        return out
+
+
+def main():
+    """Main entry point"""
+    runner = GenericTestRunner(OpTest)
+    runner.run_and_exit()
+
+
+if __name__ == "__main__":
+    main()

test/infiniop/libinfiniop/op_register.py

@@ -1115,7 +1115,6 @@ def paged_attention_prefill_(lib):
         infiniopTensorDescriptor_t,
         infiniopTensorDescriptor_t,
         infiniopTensorDescriptor_t,
-        infiniopTensorDescriptor_t,
         c_float,
     ]
 
@@ -1139,7 +1138,6 @@ def paged_attention_prefill_(lib):
         c_void_p,
         c_void_p,
         c_void_p,
-        c_void_p,
     ]
 
     lib.infiniopDestroyPagedAttentionPrefillDescriptor.restype = c_int32

test/infiniop/paged_attention_prefill.py

@@ -74,14 +74,15 @@ class SimpleCacheManager:
 
 
 def ref_paged_attention_multi_turn(
-    query_new, k_cache, v_cache, block_tables, seq_lens, new_lens, offset, scale
+    query_new, k_cache, v_cache, block_tables, seq_lens, cum_seq_lens_q, scale
 ):
     block_size = k_cache.shape[2]
     outputs = torch.zeros_like(query_new)
-    for i in range(len(offset) - 1):
-        total_len = seq_lens[i].item()
-        num_new = new_lens[i].item()
-        history_len = total_len - num_new
+    num_seqs = len(cum_seq_lens_q) - 1
+    for i in range(num_seqs):
+        num_new = cum_seq_lens_q[i + 1].item() - cum_seq_lens_q[i].item()
+        cache_len = seq_lens[i].item()
+        total_len = seq_lens[i].item() + num_new
 
         table = block_tables[i]
         keys_all, values_all = [], []
@@ -93,19 +94,19 @@ def ref_paged_attention_multi_turn(
 
         K = torch.stack(keys_all, dim=0)
         V = torch.stack(values_all, dim=0)
-        Q = query_new[offset[i] : offset[i] + num_new, :, :]
+        Q = query_new[cum_seq_lens_q[i] : cum_seq_lens_q[i + 1], :, :]
 
         scores = torch.einsum("qhd,khd->hqk", Q, K).float() * scale
 
         mask = torch.full((num_new, total_len), float("-inf"), device=Q.device)
         for q_idx in range(num_new):
-            mask[q_idx, : history_len + q_idx + 1] = 0.0
+            mask[q_idx, : cache_len + q_idx + 1] = 0.0
 
         scores = scores + mask.unsqueeze(0)
         attn_weights = torch.softmax(scores, dim=-1).to(Q.dtype)
         out = torch.einsum("hqk,khd->qhd", attn_weights, V)
 
-        outputs[offset[i] : offset[i] + num_new, :, :] = out
+        outputs[cum_seq_lens_q[i] : cum_seq_lens_q[i + 1], :, :] = out
 
     return outputs
 
@@ -147,43 +148,43 @@ def test(
     # Multi-turn testing loop
     for r in range(num_rounds):
         # Prepare dynamic inputs for this round
-        seq_lens_cpu = torch.randint(
+        query_lens_cpu = torch.randint(
             1, max_step_len + 1, (num_seqs,), dtype=torch.int64
         )
 
-        q_total_tokens = seq_lens_cpu.sum().item()
+        q_total_tokens = query_lens_cpu.sum().item()
         q_packed_tensors = torch.zeros(q_total_tokens, num_heads, head_size)
 
-        cache_lens_list = []
+        seq_lens_list = []
         all_block_tables = []
 
-        offset_list = []
-        cur_offset = 0
+        cum_seq_lens_q_list = []
+        cum_q_lens = 0
         for i in range(num_seqs):
-            offset_list.append(cur_offset)
+            cum_seq_lens_q_list.append(cum_q_lens)
 
-            cur_new_len = seq_lens_cpu[i].item()
-            table, cache_len = manager.allocate_slots(i, cur_new_len)
-            cache_lens_list.append(cache_len)
+            cur_q_len = query_lens_cpu[i].item()
+            table, total_len = manager.allocate_slots(i, cur_q_len)
+            cur_seq_lens = total_len - cur_q_len
+            seq_lens_list.append(cur_seq_lens)
             all_block_tables.append(table)
 
             # Simulated KV insertion
-            k_new = torch.randn(cur_new_len, num_kv_heads, head_size)
-            v_new = torch.randn(cur_new_len, num_kv_heads, head_size)
-            q_val = torch.randn(cur_new_len, num_heads, head_size)
-            q_packed_tensors[cur_offset : cur_offset + cur_new_len] = q_val
+            k_new = torch.randn(cur_q_len, num_kv_heads, head_size)
+            v_new = torch.randn(cur_q_len, num_kv_heads, head_size)
+            q_val = torch.randn(cur_q_len, num_heads, head_size)
+            q_packed_tensors[cum_q_lens : cum_q_lens + cur_q_len] = q_val
 
-            cur_offset = cur_offset + cur_new_len
+            cum_q_lens = cum_q_lens + cur_q_len
 
-            history_len = cache_len - cur_new_len
-            for t in range(cur_new_len):
-                logical_pos = history_len + t
+            for t in range(cur_q_len):
+                logical_pos = cur_seq_lens + t
                 b_id = table[logical_pos // block_size]
                 off = logical_pos % block_size
                 k_cache.torch_tensor()[b_id, :, off, :] = k_new[t]
                 v_cache.torch_tensor()[b_id, :, off, :] = v_new[t]
 
-        offset_list.append(cur_offset)
+        cum_seq_lens_q_list.append(cum_q_lens)
 
         k_cache.actual_tensor().copy_(k_cache._torch_tensor)
         v_cache.actual_tensor().copy_(v_cache._torch_tensor)
@@ -193,13 +194,14 @@ def test(
         out = TestTensor.from_torch(q_packed_tensors, dtype, device)
         out.actual_tensor().zero_()
 
-        cache_lens = TestTensor.from_torch(
-            torch.tensor(cache_lens_list, dtype=torch.int64), InfiniDtype.I64, device
+        seq_lens = TestTensor.from_torch(
+            torch.tensor(seq_lens_list, dtype=torch.int64), InfiniDtype.I64, device
         )
-        seq_lens = TestTensor.from_torch(seq_lens_cpu, InfiniDtype.I64, device)
 
-        offset = TestTensor.from_torch(
-            torch.tensor(offset_list, dtype=torch.int64), InfiniDtype.I64, device
+        cum_seq_lens_q = TestTensor.from_torch(
+            torch.tensor(cum_seq_lens_q_list, dtype=torch.int64),
+            InfiniDtype.I64,
+            device,
         )
 
         max_blocks = max(len(t) for t in all_block_tables)
@@ -215,9 +217,8 @@ def test(
                 k_cache.torch_tensor(),
                 v_cache.torch_tensor(),
                 block_tables.torch_tensor(),
-                cache_lens.torch_tensor(),
                 seq_lens.torch_tensor(),
-                offset.torch_tensor(),
+                cum_seq_lens_q.torch_tensor(),
                 scale,
             )
 
@@ -234,10 +235,9 @@ def test(
                 k_cache.descriptor,
                 v_cache.descriptor,
                 block_tables.descriptor,
-                cache_lens.descriptor,
                 seq_lens.descriptor,
-                offset.descriptor,
-                None,  # alibi_slopes_desc
+                cum_seq_lens_q.descriptor,
+                None,
                 scale,
             )
         )
@@ -261,9 +261,8 @@ def test(
                     k_cache.data(),
                     v_cache.data(),
                     block_tables.data(),
-                    cache_lens.data(),
                     seq_lens.data(),
-                    offset.data(),
+                    cum_seq_lens_q.data(),
                     None,
                     None,
                 )