fix buffer load lds data hazard

csrc/extension/flash_fwd_mla_kernel_fp8.h

@@ -710,6 +710,7 @@ __forceinline__ __device__ void compute_attn_1rowblock_splitkv_mla_fp8_gfx938(co
                 + offset_k * 3 * bytes_per_block;
                 asm volatile(
                     "s_mov_b32 m0, %1 \n\t"
+                    "s_nop 0 \n\t"
                     "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                     "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
                 :);  

csrc/extension/utils.h

@@ -713,6 +713,7 @@ lds_direct_copy_qkvfp8_pe(
     
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);  
@@ -779,6 +780,7 @@ lds_direct_copy_qkvfp8(
 
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);  
@@ -845,6 +847,7 @@ lds_direct_copy_qkvfp8(
         #if defined(__gfx938__)
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);   
@@ -932,6 +935,7 @@ lds_direct_copy_fp8(
         #if defined(__gfx936__) ||  defined(__gfx938__)
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);   
@@ -1003,6 +1007,7 @@ lds_direct_copy_tp1(
     // }
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);    
@@ -1183,6 +1188,7 @@ lds_direct_copy_sparse_k(
 
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);    
@@ -1251,6 +1257,7 @@ lds_direct_copy(
     
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);    
@@ -1314,6 +1321,7 @@ lds_direct_copy(
     
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);    
@@ -1403,6 +1411,7 @@ lds_direct_copy_for_prefill_sparse_mla(
     index_offset[1] = offset_v;
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 , idxen offen  offset:0, lds \n" ::"v"(index_offset),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);    
@@ -2296,6 +2305,7 @@ lds_direct_copy_qkvfp8_q_tp1(
     #if defined(__gfx938__)
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);   
@@ -2354,6 +2364,7 @@ lds_direct_copy_qkvfp8_q_tp4(
     #if defined(__gfx938__)
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);   
@@ -2435,6 +2446,7 @@ lds_direct_copy_qkvfp8_tp1(
     #if defined(__gfx938__)
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);   
@@ -2782,6 +2794,7 @@ lds_direct_copy_qkvfp8_zero_lds(
     #if defined(__gfx938__)
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);   

csrc/gfx93/decode/sparse_fp8/splitkv_mla.cuh

@@ -120,6 +120,7 @@ __device__ void KernelTemplate<MODEL_TYPE, NUM_HEADS>::compute_attn_1rowblock_sp
                 + offset_k * 3 * bytes_per_block;
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);  
@@ -137,6 +138,7 @@ __device__ void KernelTemplate<MODEL_TYPE, NUM_HEADS>::compute_attn_1rowblock_sp
                 + offset_k * 2 * bytes_per_block;
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);  

csrc/utils.h

@@ -458,6 +458,7 @@ lds_direct_copy(
     
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);    
@@ -521,6 +522,7 @@ lds_direct_copy(
     
             asm volatile(
                 "s_mov_b32 m0, %1 \n\t"
+                "s_nop 0 \n\t"
                 "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
                 "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
             :);    
@@ -591,6 +593,7 @@ lds_direct_copy_for_prefill_sparse_mla(
     index_offset[1] = offset_v;
     asm volatile(
         "s_mov_b32 m0, %1 \n\t"
+        "s_nop 0 \n\t"
         "buffer_load_dwordx4 %0, %2, %3 , idxen offen  offset:0, lds \n" ::"v"(index_offset),
         "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
     :);    
@@ -818,6 +821,7 @@ lds_direct_copy_qkvfp8(
 
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);  
@@ -884,6 +888,7 @@ lds_direct_copy_qkvfp8(
         #if defined(__gfx938__)
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);   
@@ -1041,6 +1046,7 @@ lds_direct_copy_fp8(
         #if defined(__gfx936__) ||  defined(__gfx938__)
         asm volatile(
             "s_mov_b32 m0, %1 \n\t"
+            "s_nop 0 \n\t"
             "buffer_load_dwordx4 %0, %2, %3 ,offen  offset:0, lds \n" ::"v"(offset_v),
             "s"(ldsAddrPerWave), "s"(global_addr), "s"(offset_s)
         :);