Add support for rsmi_dev_memory_reserved_pages_get()

Also, don't return an error for empty sysfs files. The reserved memory
page file will often have no lines. We don't want it to appear that
this function is not supported if the file is empty.

Change-Id: I1d28bb184ea587bb578fe71dd75adc2a812d09a8

src/rocm_smi.cc

@@ -2477,6 +2477,78 @@ rsmi_compute_process_info_get(rsmi_process_info_t *procs,
   CATCH
 }
 
+rsmi_status_t
+rsmi_dev_memory_reserved_pages_get(uint32_t dv_ind, uint32_t *num_pages,
+                                          rsmi_retired_page_record_t *records) {
+  TRY
+
+  rsmi_status_t ret;
+
+  if (num_pages == nullptr) {
+    return RSMI_STATUS_INVALID_ARGS;
+  }
+
+  std::vector<std::string> val_vec;
+
+  ret = get_dev_value_vec(amd::smi::kDevMemPageBad, dv_ind, &val_vec);
+
+  if (ret == RSMI_STATUS_FILE_ERROR) {
+    return RSMI_STATUS_NOT_SUPPORTED;
+  }
+  if (ret != RSMI_STATUS_SUCCESS) {
+    return ret;
+  }
+
+  if (records == nullptr || *num_pages > val_vec.size()) {
+    *num_pages = val_vec.size();
+  }
+  if (records == nullptr) {
+    return RSMI_STATUS_SUCCESS;
+  }
+
+  // Fill in records
+  char status_code;
+  rsmi_memory_page_status_t tmp_stat;
+  std::string junk;
+
+  for (uint32_t i = 0; i < *num_pages; ++i) {
+    std::istringstream fs1(val_vec[i]);
+
+    fs1 >> std::hex >> records[i].page_address;
+    fs1 >> junk;
+    assert(junk == ":");
+    fs1 >> std::hex >> records[i].page_size;
+    fs1 >> junk;
+    assert(junk == ":");
+    fs1 >> status_code;
+
+    switch (status_code) {
+      case 'P':
+        tmp_stat = RSMI_MEM_PAGE_STATUS_PENDING;
+        break;
+
+      case 'F':
+        tmp_stat = RSMI_MEM_PAGE_STATUS_UNRESERVABLE;
+        break;
+
+      case 'R':
+        tmp_stat = RSMI_MEM_PAGE_STATUS_RESERVED;
+        break;
+      default:
+        assert(!"Unexpected retired memory page status code read");
+        return RSMI_STATUS_UNKNOWN_ERROR;
+    }
+    records[i].status = tmp_stat;
+  }
+  if (*num_pages < val_vec.size()) {
+    return RSMI_STATUS_INSUFFICIENT_SIZE;
+  }
+
+  return RSMI_STATUS_SUCCESS;
+
+  CATCH
+}
+
 rsmi_status_t
 rsmi_compute_process_info_by_pid_get(uint32_t pid,
                                                   rsmi_process_info_t *proc) {