Add support to retrieve process VRAM usage information.

Change-Id: I60843a99207a658022a26aa346b79f91863833cf

src/rocm_smi.cc

@@ -2924,7 +2924,17 @@ rsmi_compute_process_info_by_pid_get(uint32_t pid,
     return RSMI_STATUS_INVALID_ARGS;
   }
 
-  int err = amd::smi::GetProcessInfoForPID(pid, proc);
+  std::unordered_set<uint64_t> gpu_set;
+  amd::smi::RocmSMI& smi = amd::smi::RocmSMI::getInstance();
+  auto it = smi.kfd_node_map().begin();
+
+  while (it != smi.kfd_node_map().end()) {
+    uint64_t gpu_id = it->first;
+    gpu_set.insert(gpu_id);
+    it++;
+  }
+
+  int err = amd::smi::GetProcessInfoForPID(pid, proc, &gpu_set);
 
   if (err) {
     return errno_to_rsmi_status(err);

src/rocm_smi_kfd.cc

@@ -384,10 +384,13 @@ int GetProcessGPUs(uint32_t pid, std::unordered_set<uint64_t> *gpu_set) {
   return 0;
 }
 
-int GetProcessInfoForPID(uint32_t pid, rsmi_process_info_t *proc) {
+int GetProcessInfoForPID(uint32_t pid, rsmi_process_info_t *proc,
+                         std::unordered_set<uint64_t> *gpu_set) {
   assert(proc != nullptr);
+  assert(gpu_set != nullptr);
   int err;
   std::string tmp;
+  std::unordered_set<uint64_t>::iterator itr;
 
   std::string proc_str_path = kKFDProcPathRoot;
   proc_str_path += "/";
@@ -413,6 +416,27 @@ int GetProcessInfoForPID(uint32_t pid, rsmi_process_info_t *proc) {
   }
   proc->pasid = std::stoi(tmp);
 
+  proc->vram_usage = 0;
+
+  for (itr = gpu_set->begin(); itr != gpu_set->end(); itr++) {
+    uint64_t gpu_id = (*itr);
+
+    std::string vram_str_path = proc_str_path;
+    vram_str_path += "/vram_";
+    vram_str_path += std::to_string(gpu_id);
+
+    err = ReadSysfsStr(vram_str_path, &tmp);
+    if (err) {
+      return err;
+    }
+
+    if (!is_number(tmp)) {
+      return EINVAL;
+    }
+
+    proc->vram_usage += std::stoi(tmp);
+  }
+
   return 0;
 }