Gcn arch name (#886)

We use CMake to determine if we're compiling against a version of ROCm that supports gcnArchName and handles architecture checking appropriately. It includes a few helper functions as drop ins for the functionality we used gcnArch for before; sometimes to enable flags, and sometimes to set frequencies.

src/graph/topo.cc

@@ -369,7 +369,14 @@ ncclResult_t ncclTopoAddNic(struct ncclXmlNode* xmlNic, struct ncclTopoSystem* s
 
 ncclResult_t ncclTopoAddGpu(struct ncclXmlNode* xmlGpu, struct ncclTopoSystem* system, struct ncclTopoNode* gpu) {
   NCCLCHECK(xmlGetAttrInt(xmlGpu, "sm", &gpu->gpu.cudaCompCap));
-  NCCLCHECK(xmlGetAttrInt(xmlGpu, "gcn", &gpu->gpu.gcn));
+  NCCLCHECK(xmlGetAttr(xmlGpu, "gcn", &gpu->gpu.gcn));
+  if (strcmp(gpu->gpu.gcn, "906") == 0) {
+    gpu->gpu.gcn = "gfx906";
+  } else if (strcmp(gpu->gpu.gcn, "908") == 0) {
+    gpu->gpu.gcn = "gfx908";
+  } else if (strcmp(gpu->gpu.gcn, "910") == 0) {
+    gpu->gpu.gcn = "gfx90a";
+  }
   rcclHipDeviceArch_t arch;
   NCCLCHECK(xmlGetAttrInt(xmlGpu, "arch", &arch.value));
   memcpy(&gpu->gpu.arch, &arch.arch, sizeof(hipDeviceArch_t));