dev-amdgpu: Add user-mode TranslationGen to SDMA

RLC queue do translation using user mode addresses. To support this, add
the final aperture translation needed to the SDMA engine.

Change-Id: I25841e240e3b44f66d26d503ab52b54379daa49a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63032
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>

src/dev/amdgpu/sdma_engine.cc

@@ -137,7 +137,12 @@ SDMAEngine::getDeviceAddress(Addr raw_addr)
 TranslationGenPtr
 SDMAEngine::translate(Addr vaddr, Addr size)
 {
-    if (gpuDevice->getVM().inAGP(vaddr)) {
+    if (cur_vmid > 0) {
+        // Only user translation is available to user queues (vmid > 0)
+        return TranslationGenPtr(new AMDGPUVM::UserTranslationGen(
+                                            &gpuDevice->getVM(), walker,
+                                            cur_vmid, vaddr, size));
+    } else if (gpuDevice->getVM().inAGP(vaddr)) {
         // Use AGP translation gen
         return TranslationGenPtr(
             new AMDGPUVM::AGPTranslationGen(&gpuDevice->getVM(), vaddr, size));