Discover the amdgpu when card numbers are not consecutive.

When discover the amdgpu, if the assigned numbers are not consecutive,
not all GPU can be discovered. The code is change to discover the
GPU based on max card number.

Change-Id: I8b6a8b49594d6a54c7feb2645bedb83dc5c1b4cc

src/rocm_smi_main.cc

@@ -713,6 +713,8 @@ static bool isAMDGPU(std::string dev_path) {
 uint32_t RocmSMI::DiscoverAmdgpuDevices(void) {
   std::string err_msg;
   uint32_t count = 0;
+  int32_t cardId = 0;
+  int32_t max_cardId = -1;
   std::ostringstream ss;
 
   // If this gets called more than once, clear previous findings.
@@ -736,6 +738,9 @@ uint32_t RocmSMI::DiscoverAmdgpuDevices(void) {
         if ((strcmp(dentry->d_name, ".") == 0) ||
            (strcmp(dentry->d_name, "..") == 0))
            continue;
+        sscanf(&dentry->d_name[strlen(kDeviceNamePrefix)], "%d", &cardId);
+        if (cardId > max_cardId)
+          max_cardId = cardId;
         count++;
     }
     dentry = readdir(drm_dir);
@@ -818,7 +823,7 @@ uint32_t RocmSMI::DiscoverAmdgpuDevices(void) {
 
   uint32_t cardAdded = 0;
   // Discover all root cards & gpu partitions associated with each
-  for (uint32_t cardId = 0; cardId < count; cardId++) {
+  for (uint32_t cardId = 0; cardId <= max_cardId; cardId++) {
     std::string path = kPathDRMRoot;
     path += "/card";
     path += std::to_string(cardId);