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 # Stage D — Parameterized FMHA for DSV4
 
+
+## 🎉 VICTORY: D1.3 SOLVED! (2026-05-23)
+
+**After intensive debugging, SMEM-P rank mismatch issue resolved!**
+
+**Problem:** SMEM-P copy failed with "Expected source and destination tensors to have the same rank, but got 5 and 3"
+
+**Root Cause:**  tensor used TMEM layout () with extra singleton modes, while SMEM copy expected QK C-fragment layout.
+
+**Solution:** Create  tensor viewing same data with QK C-fragment layout ():
+
+
+**Impact:** Enables hd>64 support (128, 256, 512). Multi-PV-tile works for hd=512 (2 tiles of 256 each).
+
+**Status:** Kernel compiles and runs for all head dimensions. SMEM-P path enabled for hd>64.
+
+
 ## ⚠️ IKEA INSTRUCTIONS — READ EVERY TIME BEFORE CODING
 
 ### The Workflow (DO NOT SKIP STEPS)