[ROCm][Misc] Follow-ups for Skinny Gemms on ROCm. (vllm-project#17011)

Signed-off-by: charlifu <[email protected]>

Author: charlifu

vllm/model_executor/layers/quantization/utils/w8a8_utils.py

@@ -155,8 +155,9 @@ def rocm_per_tensor_w8a8_scaled_mm(*, qinput: torch.Tensor,
                                    scale_b: torch.Tensor, bias: torch.Tensor,
                                    input_2d: torch.Tensor,
                                    output_shape: List) -> torch.Tensor:
-    if envs.VLLM_ROCM_USE_SKINNY_GEMM and qinput.shape[
-            0] == 1 and qinput.shape[1] % 16 == 0:
+    from vllm.platforms.rocm import on_mi250_mi300
+    if envs.VLLM_ROCM_USE_SKINNY_GEMM and not on_mi250_mi300(
+    ) and qinput.shape[0] == 1 and qinput.shape[1] % 16 == 0:
         output = ops.wvSplitKQ(weight.t(), qinput, out_dtype, scale_a, scale_b,
                                current_platform.get_cu_count())
     else:
@@ -371,7 +372,7 @@ def apply(
 
         return w8a8_scaled_mm_func(qinput=qinput,
                                    weight=weight,
-                                   out_dtype=input.dtype,
+                                   out_dtype=out_dtype,
                                    scale_a=x_scale,
                                    scale_b=weight_scale,
                                    bias=bias,

vllm/model_executor/layers/utils.py

@@ -70,8 +70,9 @@ def apply_penalties(logits: torch.Tensor, prompt_tokens_tensor: torch.Tensor,
 def rocm_unquantized_gemm(x: torch.Tensor,
                           weight: torch.Tensor,
                           bias: Optional[torch.Tensor] = None):
+    from vllm.platforms.rocm import on_mi250_mi300
     k = weight.shape[1]
-    use_skinny = (envs.VLLM_ROCM_USE_SKINNY_GEMM and \
+    use_skinny = (envs.VLLM_ROCM_USE_SKINNY_GEMM and on_mi250_mi300() and \
                     x.dtype in [torch.float16, torch.bfloat16] \
                     and k % 8 == 0 and bias is None)
 
@@ -83,11 +84,11 @@ def rocm_unquantized_gemm(x: torch.Tensor,
     m = weight.shape[0]
     cu_count = current_platform.get_cu_count()
 
-    if m > 8 and n < 4:
+    if m > 8 and 0 < n < 4:
         out = ops.wvSplitK(weight, x_view, cu_count)
         return out.view(*x.shape[:-1], weight.shape[0])
     elif m % 4 == 0 and n == 1 and k <= 8192:
-        out = ops.LLMM1(weight, x_view, out, 4)
+        out = ops.LLMM1(weight, x_view, 4)
         return out.view(*x.shape[:-1], weight.shape[0])
     return torch.nn.functional.linear(x, weight, bias)
 

vllm/model_executor/layers/vocab_parallel_embedding.py

@@ -12,6 +12,7 @@
                               tensor_model_parallel_all_reduce)
 from vllm.model_executor.layers.quantization.base_config import (
     QuantizationConfig, QuantizeMethodBase, method_has_implemented_embedding)
+from vllm.model_executor.layers.utils import dispatch_unquantized_gemm
 from vllm.model_executor.parameter import BasevLLMParameter
 from vllm.model_executor.utils import set_weight_attrs
 from vllm.platforms import current_platform
@@ -40,7 +41,7 @@ def apply(self,
               layer: torch.nn.Module,
               x: torch.Tensor,
               bias: Optional[torch.Tensor] = None) -> torch.Tensor:
-        return F.linear(x, layer.weight, bias)
+        return dispatch_unquantized_gemm()(x, layer.weight, bias)
 
     def embedding(self, layer: torch.nn.Module,
                   input_: torch.Tensor) -> torch.Tensor:

vllm/platforms/rocm.py

@@ -98,22 +98,22 @@ def device_id_to_physical_device_id(device_id: int) -> int:
         return device_id
 
 
+def on_mi250_mi300() -> bool:
+    GPU_ARCH = torch.cuda.get_device_properties("cuda").gcnArchName
+    return any(arch in GPU_ARCH for arch in ["gfx90a", "gfx942"])
+
+
 @cache
 def use_rocm_custom_paged_attention(qtype: torch.dtype, head_size: int,
                                     block_size: int, gqa_ratio: int,
                                     max_seq_len: int,
                                     sliding_window: int) -> bool:
 
-    GPU_ARCH = torch.cuda.get_device_properties("cuda").gcnArchName
-    ON_NAVI = "gfx1" in GPU_ARCH
-    ON_MI250_MI300 = any(arch in GPU_ARCH for arch in ["gfx90a", "gfx942"])
-
-    # rocm custom page attention not support on navi (gfx1*)
+    # rocm custom page attention not support on gfx1*
     # custom paged attn always supported on V0. On V1, requires sliding window
     # disabled due to observed numerical discrepancy.
-    return (ON_MI250_MI300 and not ON_NAVI
-            and (not envs.VLLM_USE_V1 or sliding_window == 0
-                 or sliding_window == (-1, -1))
+    return (on_mi250_mi300() and (not envs.VLLM_USE_V1 or sliding_window == 0
+                                  or sliding_window == (-1, -1))
             and (qtype == torch.half or qtype == torch.bfloat16)
             and (head_size == 64 or head_size == 128)
             and (block_size == 16 or block_size == 32)