opencl: fix two issues on flash attention for Adreno a7x (#25697)

* opencl: route `sub_group_shuffle_xor` to qcom ext when KHR ext is unavailable

KHR `sub_group_shuffle_xor` is not defined by compiler when
`cl_qcom_subgroup_shuffle` is present, causing certain FA
kernels fail to build. Define the KHR shuffle_xor using
the qcom extension.

* opencl: skip FA kernels with mixed and quant types for A7x to avoid compiler crash

ggml/src/ggml-opencl/ggml-opencl.cpp

@@ -7319,6 +7319,14 @@ static bool ggml_opencl_supports_op(ggml_backend_dev_t dev, const struct ggml_te
                 return false;
             }
 
+            // Some compilers for A7x (Adreno 740, compiler E031.41) crashes when
+            // building FA kernels with mixed or quant types (f32_f16, f32_q8_0, f32_q4_0)
+            // Here we skip all A7x for these kernels to avoid crash
+            if (backend_ctx->adreno_gen == ADRENO_GPU_GEN::A7X &&
+                (is_f32_f16 || is_f32_q8_0 || is_f32_q4_0)) {
+                return false;
+            }
+
             if (dk == 512) {
                 if (backend_ctx->gpu_family == INTEL) {
                     return false;

ggml/src/ggml-opencl/kernels/flash_attn_f32_f16.cl

@@ -30,6 +30,10 @@
 #elif defined(cl_qcom_subgroup_shuffle)
 #pragma OPENCL EXTENSION cl_qcom_subgroup_shuffle : enable
 #define HAS_SUBGROUP_SHUFFLE 1
+// Adreno compilers that expose only cl_qcom_subgroup_shuffle do not declare the KHR
+// name, so calling it is an implicit declaration and the program fails to build.
+// Route it to the qcom builtin.
+#define sub_group_shuffle_xor(val, mask) qcom_sub_group_shuffle_xor((val), (mask), CLK_SUB_GROUP_SHUFFLE_WIDTH_WAVE_SIZE_QCOM, 0.0f)
 #endif
 
 #define ACC_TYPE float

ggml/src/ggml-opencl/kernels/flash_attn_f32_q4_0.cl

@@ -10,6 +10,10 @@
 #elif defined(cl_qcom_subgroup_shuffle)
 #pragma OPENCL EXTENSION cl_qcom_subgroup_shuffle : enable
 #define HAS_SUBGROUP_SHUFFLE 1
+// Adreno compilers that expose only cl_qcom_subgroup_shuffle do not declare the KHR
+// name, so calling it is an implicit declaration and the program fails to build.
+// Route it to the qcom builtin.
+#define sub_group_shuffle_xor(val, mask) qcom_sub_group_shuffle_xor((val), (mask), CLK_SUB_GROUP_SHUFFLE_WIDTH_WAVE_SIZE_QCOM, 0.0f)
 #endif
 
 // Flash attention: Q=f32, K=q4_0, V=q4_0.

ggml/src/ggml-opencl/kernels/flash_attn_f32_q8_0.cl

@@ -10,6 +10,10 @@
 #elif defined(cl_qcom_subgroup_shuffle)
 #pragma OPENCL EXTENSION cl_qcom_subgroup_shuffle : enable
 #define HAS_SUBGROUP_SHUFFLE 1
+// Adreno compilers that expose only cl_qcom_subgroup_shuffle do not declare the KHR
+// name, so calling it is an implicit declaration and the program fails to build.
+// Route it to the qcom builtin.
+#define sub_group_shuffle_xor(val, mask) qcom_sub_group_shuffle_xor((val), (mask), CLK_SUB_GROUP_SHUFFLE_WIDTH_WAVE_SIZE_QCOM, 0.0f)
 #endif
 
 // Flash attention: Q=f32, K=q8_0, V=q8_0.

ggml/src/ggml-opencl/kernels/mul_mv_f16_f32_l4.cl

@@ -24,6 +24,10 @@
 #elif defined(cl_qcom_subgroup_shuffle)
 #pragma OPENCL EXTENSION cl_qcom_subgroup_shuffle : enable
 #define HAS_SUBGROUP_SHUFFLE 1
+// Adreno compilers that expose only cl_qcom_subgroup_shuffle do not declare the KHR
+// name, so calling it is an implicit declaration and the program fails to build.
+// Route it to the qcom builtin.
+#define sub_group_shuffle_xor(val, mask) qcom_sub_group_shuffle_xor((val), (mask), CLK_SUB_GROUP_SHUFFLE_WIDTH_WAVE_SIZE_QCOM, 0.0f)
 #endif
 
 // Assumes row size (ne00) is a multiple of 4