[rocm-libraries] ROCm/rocm-libraries#4584 (commit 42efd1d)

[CK_TILE][FMHA] Support gfx11

## Motivation

Add support of gfx11 architectures (RDNA3) to FMHA.

## Technical Details

Distributions (matrix elements to lane registers mapping) of gfx11 WMMA
are completely different from distributions of gfx9 MFMA and gfx12 WMMA.
There are two cases in FMHA where this difference matters:
* usage of results (matrix C) of one GEMM as input (matrix A) of another
GEMM.
* random number generation for dropout (implementation for gfx9 MFMA,
gfx12 WMMA and host validation produce the same results).

Both cases are solved by a special remapping implemented using
`__builtin_amdgcn_permlanex16` and `__builtin_amdgcn_perm`.

Additional changes:
* FMHA tests are now build and run only for those types for which
instances exist (gfx11 supports only fp16 and bf16).
* Two fixes for uninitialized values (`mask.sink` and
`do_fp8_static_quant`): they may contain garbage resulting in incorrect
dispatching logic, sometimes tests report that there are no instance
available for current parameters.
* Small fix to remove expcnt(0) from s_waitcnt instruction on gfx11 when
they are not requested (i.e. every time), likely has no effect on
performance but makes disassembly a bit clearer.

## Test Plan

```
ninja test_ck_tile_fmha

bin/test_ck_tile_fmha_fwd_fp16
bin/test_ck_tile_fmha_fwd_bf16
bin/test_ck_tile_fmha_bwd_fp16
bin/test_ck_tile_fmha_bwd_bf16
```

## Test Result

All tests must pass (some tests may be skipped).

## Submission Checklist

- [x] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

include/ck_tile/ops/fmha/block/block_dropout.hpp

@@ -33,6 +33,42 @@ namespace ck_tile {
 namespace detail {
 // The number of Philox 4x32 results required to fill 32x32 tile of 8-bit values
 constexpr index_t philox_per_tile = 64;
+
+// C distribution of gfx11 WMMA differs from C distribution of gfx9 MFMA and gfx12 WMMA.
+// This function deinterleaves the generated random values to make them compatible with other
+// architectures and verification code on host.
+template <index_t N>
+CK_TILE_DEVICE void PermuteBlockDropoutRandval(uint8_t (&random_uint8_t)[N])
+{
+#if defined(__gfx11__)
+    static_for<0, N, 8>{}([&](auto i_offset) {
+        array<uint8_t, 8> rs;
+        static_for<0, 8, 1>{}([&](auto i) { rs.data[i] = random_uint8_t[i_offset + i]; });
+
+        const uint32_t r0 = rs.template get_as<uint32_t>(number<0>{});
+        const uint32_t r1 = rs.template get_as<uint32_t>(number<1>{});
+
+        // Deinterleave values (even and odd indices)
+        const uint32_t v0 = __builtin_amdgcn_perm(r1, r0, 0x06'04'02'00);
+        const uint32_t v1 = __builtin_amdgcn_perm(r1, r0, 0x07'05'03'01);
+
+        // Swap rows (lane <-> lane ^ 16)
+        const uint32_t w0 =
+            __builtin_amdgcn_permlanex16(0, v0, 0x76543210, 0xfedcba98, false, true);
+        const uint32_t w1 =
+            __builtin_amdgcn_permlanex16(0, v1, 0x76543210, 0xfedcba98, false, true);
+
+        rs.template set_as<uint32_t>(number<0>{}, get_lane_id() < 16 ? v0 : w1);
+        rs.template set_as<uint32_t>(number<1>{}, get_lane_id() < 16 ? w0 : v1);
+
+        static_for<0, 8, 1>{}([&](auto i) { random_uint8_t[i_offset + i] = rs.data[i]; });
+    });
+#else
+    static_assert(false, "PermuteBlockDropoutRandval is only for gfx11");
+    ignore = random_uint8_t;
+#endif
+}
+
 } // namespace detail
 
 struct NullBlockDropout
@@ -295,6 +331,9 @@ struct BlockDropout
                         static_assert(randval_dist_generated.kThreadElementSpaceSize == 16);
                         ph.get_random_16x8(random_uint8_t, ph_subsequence);
                     }
+#if defined(__gfx11__)
+                    detail::PermuteBlockDropoutRandval(random_uint8_t);
+#endif
                 }
                 else
                 {
@@ -566,6 +605,9 @@ struct BlockDropoutBwd<true, IsWG32_, IsStoreRandval_>
                         static_assert(randval_dist_generated.kThreadElementSpaceSize == 16);
                         ph.get_random_16x8(random_uint8_t, ph_subsequence);
                     }
+#if defined(__gfx11__)
+                    detail::PermuteBlockDropoutRandval(random_uint8_t);
+#endif
                 }
                 else
                 {