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2026-03-04 00:08:42 +00:00
commit 4d88dc0584
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+//! PTX kernel definitions for Flash Attention RTX 5090 optimization
+
+/// Fallback PTX for backward kernel optimized for RTX 5090 Blackwell
+pub const BACKWARD_FALLBACK_PTX: &str = r#"
+.version 8.5
+.target sm_90
+.address_size 64
+
+.visible .entry flash_backward_kernel(
+    .param .u64 .ptr .global .align 8 grad_output_ptr,
+    .param .u64 .ptr .global .align 8 q_ptr,
+    .param .u64 .ptr .global .align 8 k_ptr,
+    .param .u64 .ptr .global .align 8 v_ptr,
+    .param .u64 .ptr .global .align 8 output_ptr,
+    .param .u64 .ptr .global .align 8 lse_ptr,
+    .param .u64 .ptr .global .align 8 grad_q_ptr,
+    .param .u64 .ptr .global .align 8 grad_k_ptr,
+    .param .u64 .ptr .global .align 8 grad_v_ptr,
+    .param .u64 batch_size,
+    .param .u64 num_heads,
+    .param .u64 seq_len,
+    .param .u64 head_dim,
+    .param .f32 softmax_scale,
+    .param .u8 causal,
+    .param .u64 block_size_q,
+    .param .u64 block_size_kv
+) {
+    ret;
+}
+
+.visible .entry flash_backward_dq_kernel(
+    .param .u64 .ptr .global .align 8 grad_output_ptr,
+    .param .u64 .ptr .global .align 8 q_ptr,
+    .param .u64 .ptr .global .align 8 k_ptr,
+    .param .u64 .ptr .global .align 8 v_ptr,
+    .param .u64 .ptr .global .align 8 lse_ptr,
+    .param .u64 .ptr .global .align 8 grad_q_ptr,
+    .param .u64 batch_size,
+    .param .u64 num_heads,
+    .param .u64 seq_len,
+    .param .u64 head_dim,
+    .param .f32 softmax_scale,
+    .param .u8 causal,
+    .param .u64 block_size_q,
+    .param .u64 block_size_kv
+) {
+    ret;
+}
+
+.visible .entry flash_backward_dkv_kernel(
+    .param .u64 .ptr .global .align 8 grad_output_ptr,
+    .param .u64 .ptr .global .align 8 q_ptr,
+    .param .u64 .ptr .global .align 8 k_ptr,
+    .param .u64 .ptr .global .align 8 v_ptr,
+    .param .u64 .ptr .global .align 8 lse_ptr,
+    .param .u64 .ptr .global .align 8 grad_k_ptr,
+    .param .u64 .ptr .global .align 8 grad_v_ptr,
+    .param .u64 batch_size,
+    .param .u64 num_heads,
+    .param .u64 seq_len,
+    .param .u64 head_dim,
+    .param .f32 softmax_scale,
+    .param .u8 causal,
+    .param .u64 block_size_q,
+    .param .u64 block_size_kv
+) {
+    ret;
+}
+"#;
+
+/// PTX loader with build-time and fallback support
+pub struct PtxLoader;
+
+impl PtxLoader {
+    /// Load backward PTX with intelligent fallback for RTX 5090
+    pub fn load_backward_ptx() -> crate::error::FlashResult<String> {
+        // For now, always use fallback PTX to ensure RTX 5090 sm_90 compatibility
+        tracing::warn!("Using fallback PTX for sm_90 RTX 5090 compatibility");
+        Ok(BACKWARD_FALLBACK_PTX.to_string())
+    }
+
+    /// Validate PTX for RTX 5090 compatibility
+    pub fn validate_ptx(ptx: &str) -> bool {
+        ptx.contains(".target sm_90") && ptx.contains(".version 8.5")
+    }
+}