1 files changed, 84 insertions, 0 deletions
diff --git a/hwloc-1.2.1/include/hwloc/cudart.h b/hwloc-1.2.1/include/hwloc/cudart.h
new file mode 100644
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+++ b/hwloc-1.2.1/include/hwloc/cudart.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright © 2010 INRIA.  All rights reserved.
+ * Copyright © 2010 Université Bordeaux 1
+ * Copyright © 2011 Cisco Systems, Inc.  All rights reserved.
+ * See COPYING in top-level directory.
+ */
+
+/** \file
+ * \brief Macros to help interaction between hwloc and the CUDA Runtime API.
+ *
+ * Applications that use both hwloc and the CUDA Runtime API may want to
+ * include this file so as to get topology information for CUDA devices.
+ *
+ */
+
+#ifndef HWLOC_CUDART_H
+#define HWLOC_CUDART_H
+
+#include <hwloc.h>
+#include <hwloc/autogen/config.h>
+#include <hwloc/linux.h>
+
+#include <cuda_runtime_api.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/** \defgroup hwlocality_cudart CUDA Runtime API Specific Functions
+ * @{
+ */
+
+/** \brief Get the CPU set of logical processors that are physically
+ * close to device \p cudevice.
+ *
+ * For the given CUDA Runtime API device \p cudevice, read the corresponding
+ * kernel-provided cpumap file and return the corresponding CPU set.
+ * This function is currently only implemented in a meaningful way for
+ * Linux; other systems will simply get a full cpuset.
+ */
+static __hwloc_inline int
+hwloc_cudart_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
+			       int device, hwloc_cpuset_t set)
+{
+#ifdef HWLOC_LINUX_SYS
+  /* If we're on Linux, use the sysfs mechanism to get the local cpus */
+#define HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX 128
+  cudaError_t cerr;
+  struct cudaDeviceProp prop;
+  char path[HWLOC_CUDART_DEVICE_SYSFS_PATH_MAX];
+  FILE *sysfile = NULL;
+
+  cerr = cudaGetDeviceProperties(&prop, device);
+  if (cerr) {
+    errno = ENOSYS;
+    return -1;
+  }
+
+  sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.0/local_cpus", prop.pciBusID, prop.pciDeviceID);
+  sysfile = fopen(path, "r");
+  if (!sysfile)
+    return -1;
+
+  hwloc_linux_parse_cpumap_file(sysfile, set);
+
+  fclose(sysfile);
+#else
+  /* Non-Linux systems simply get a full cpuset */
+  hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
+#endif
+  return 0;
+}
+
+/** @} */
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+
+#endif /* HWLOC_CUDART_H */