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/*
* Copyright © 2012 Blue Brain Project, EPFL. All rights reserved.
* Copyright © 2012-2013 Inria. All rights reserved.
* See COPYING in top-level directory.
*/
/** \file
* \brief Macros to help interaction between hwloc and OpenGL displays.
*
* Applications that use both hwloc and OpenGL may want to include
* this file so as to get topology information for OpenGL displays.
*/
#ifndef HWLOC_GL_H
#define HWLOC_GL_H
#include "hwloc.h"
#include <stdio.h>
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif
/** \defgroup hwlocality_gl Interoperability with OpenGL displays
*
* This interface offers ways to retrieve topology information about
* OpenGL displays.
*
* Only the NVIDIA display locality information is currently available,
* using the NV-CONTROL X11 extension and the NVCtrl library.
*
* @{
*/
/** \brief Get the hwloc OS device object corresponding to the
* OpenGL display given by port and device index.
*
* Return the OS device object describing the OpenGL display
* whose port (server) is \p port and device (screen) is \p device.
* Return NULL if there is none.
*
* The topology \p topology does not necessarily have to match the current
* machine. For instance the topology may be an XML import of a remote host.
* I/O devices detection and the GL component must be enabled in the topology.
*
* \note The corresponding PCI device object can be obtained by looking
* at the OS device parent object (unless PCI devices are filtered out).
*/
static __hwloc_inline hwloc_obj_t
hwloc_gl_get_display_osdev_by_port_device(hwloc_topology_t topology,
unsigned port, unsigned device)
{
unsigned x = (unsigned) -1, y = (unsigned) -1;
hwloc_obj_t osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
if (HWLOC_OBJ_OSDEV_GPU == osdev->attr->osdev.type
&& osdev->name
&& sscanf(osdev->name, ":%u.%u", &x, &y) == 2
&& port == x && device == y)
return osdev;
}
errno = EINVAL;
return NULL;
}
/** \brief Get the hwloc OS device object corresponding to the
* OpenGL display given by name.
*
* Return the OS device object describing the OpenGL display
* whose name is \p name, built as ":port.device" such as ":0.0" .
* Return NULL if there is none.
*
* The topology \p topology does not necessarily have to match the current
* machine. For instance the topology may be an XML import of a remote host.
* I/O devices detection and the GL component must be enabled in the topology.
*
* \note The corresponding PCI device object can be obtained by looking
* at the OS device parent object (unless PCI devices are filtered out).
*/
static __hwloc_inline hwloc_obj_t
hwloc_gl_get_display_osdev_by_name(hwloc_topology_t topology,
const char *name)
{
hwloc_obj_t osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
if (HWLOC_OBJ_OSDEV_GPU == osdev->attr->osdev.type
&& osdev->name
&& !strcmp(name, osdev->name))
return osdev;
}
errno = EINVAL;
return NULL;
}
/** \brief Get the OpenGL display port and device corresponding
* to the given hwloc OS object.
*
* Return the OpenGL display port (server) in \p port and device (screen)
* in \p screen that correspond to the given hwloc OS device object.
* Return \c -1 if there is none.
*
* The topology \p topology does not necessarily have to match the current
* machine. For instance the topology may be an XML import of a remote host.
* I/O devices detection and the GL component must be enabled in the topology.
*/
static __hwloc_inline int
hwloc_gl_get_display_by_osdev(hwloc_topology_t topology __hwloc_attribute_unused,
hwloc_obj_t osdev,
unsigned *port, unsigned *device)
{
unsigned x = -1, y = -1;
if (HWLOC_OBJ_OSDEV_GPU == osdev->attr->osdev.type
&& sscanf(osdev->name, ":%u.%u", &x, &y) == 2) {
*port = x;
*device = y;
return 0;
}
errno = EINVAL;
return -1;
}
/** @} */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_GL_H */
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