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gl.h
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/* * Copyright © 2012 Blue Brain Project, EPFL. All rights reserved. * Copyright © 2012-2021 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 hwloc OS device object describing the OpenGL display * whose port (server) is \p port and device (screen) is \p device. * \return \c NULL if none could be found. * * 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 hwloc OS device object describing the OpenGL display * whose name is \p name, built as ":port.device" such as ":0.0" . * \return \c NULL if none could be found. * * 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. * * Retrieves 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 none could be found. * * 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 */