cuda.h
/*
* Copyright © 2010-2017 Inria. All rights reserved.
* Copyright © 2010-2011 Université Bordeaux
* Copyright © 2011 Cisco Systems, Inc. All rights reserved.
* See COPYING in top-level directory.
*/
#ifndef HWLOC_CUDA_H
#define HWLOC_CUDA_H
#include <hwloc.h>
#include <hwloc/autogen/config.h>
#include <hwloc/helper.h>
#ifdef HWLOC_LINUX_SYS
#include <hwloc/linux.h>
#endif
#include <cuda.h>
#ifdef __cplusplus
extern "C" {
#endif
static __hwloc_inline int
hwloc_cuda_get_device_pci_ids(hwloc_topology_t topology __hwloc_attribute_unused,
CUdevice cudevice, int *domain, int *bus, int *dev)
{
CUresult cres;
#if CUDA_VERSION >= 4000
cres = cuDeviceGetAttribute(domain, CU_DEVICE_ATTRIBUTE_PCI_DOMAIN_ID, cudevice);
if (cres != CUDA_SUCCESS) {
errno = ENOSYS;
return -1;
}
#else
*domain = 0;
#endif
cres = cuDeviceGetAttribute(bus, CU_DEVICE_ATTRIBUTE_PCI_BUS_ID, cudevice);
if (cres != CUDA_SUCCESS) {
errno = ENOSYS;
return -1;
}
cres = cuDeviceGetAttribute(dev, CU_DEVICE_ATTRIBUTE_PCI_DEVICE_ID, cudevice);
if (cres != CUDA_SUCCESS) {
errno = ENOSYS;
return -1;
}
return 0;
}
static __hwloc_inline int
hwloc_cuda_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
CUdevice cudevice, hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
/* If we're on Linux, use the sysfs mechanism to get the local cpus */
#define HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX 128
char path[HWLOC_CUDA_DEVICE_SYSFS_PATH_MAX];
FILE *sysfile = NULL;
int domainid, busid, deviceid;
if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domainid, &busid, &deviceid))
return -1;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return -1;
}
sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.0/local_cpus", domainid, busid, deviceid);
sysfile = fopen(path, "r");
if (!sysfile)
return -1;
if (hwloc_linux_parse_cpumap_file(sysfile, set) < 0
|| hwloc_bitmap_iszero(set))
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
fclose(sysfile);
#else
/* Non-Linux systems simply get a full cpuset */
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
return 0;
}
static __hwloc_inline hwloc_obj_t
hwloc_cuda_get_device_pcidev(hwloc_topology_t topology, CUdevice cudevice)
{
int domain, bus, dev;
if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
return NULL;
return hwloc_get_pcidev_by_busid(topology, domain, bus, dev, 0);
}
static __hwloc_inline hwloc_obj_t
hwloc_cuda_get_device_osdev(hwloc_topology_t topology, CUdevice cudevice)
{
hwloc_obj_t osdev = NULL;
int domain, bus, dev;
if (hwloc_cuda_get_device_pci_ids(topology, cudevice, &domain, &bus, &dev))
return NULL;
osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
hwloc_obj_t pcidev = osdev->parent;
if (strncmp(osdev->name, "cuda", 4))
continue;
if (pcidev
&& pcidev->type == HWLOC_OBJ_PCI_DEVICE
&& (int) pcidev->attr->pcidev.domain == domain
&& (int) pcidev->attr->pcidev.bus == bus
&& (int) pcidev->attr->pcidev.dev == dev
&& pcidev->attr->pcidev.func == 0)
return osdev;
}
return NULL;
}
static __hwloc_inline hwloc_obj_t
hwloc_cuda_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
{
hwloc_obj_t osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
&& osdev->name
&& !strncmp("cuda", osdev->name, 4)
&& atoi(osdev->name + 4) == (int) idx)
return osdev;
}
return NULL;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_CUDA_H */
hwloc_cuda_get_device_pcidev
static hwloc_obj_t hwloc_cuda_get_device_pcidev(hwloc_topology_t topology, CUdevice cudevice)
Get the hwloc PCI device object corresponding to the CUDA device cudevice.
Definition: cuda.h:138
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (system object)
Definition: hwloc.h:403
HWLOC_OBJ_PCI_DEVICE
PCI device. These objects have neither CPU sets nor node sets. They are not added to the topology unl...
Definition: hwloc.h:246
hwloc_cuda_get_device_osdev
static hwloc_obj_t hwloc_cuda_get_device_osdev(hwloc_topology_t topology, CUdevice cudevice)
Get the hwloc OS device object corresponding to CUDA device cudevice.
Definition: cuda.h:162
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:543
hwloc_obj::attr
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:373
hwloc_topology_get_complete_cpuset
static hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
Definition: helper.h:803
hwloc_get_pcidev_by_busid
static hwloc_obj_t hwloc_get_pcidev_by_busid(hwloc_topology_t topology, unsigned domain, unsigned bus, unsigned dev, unsigned func)
Find the PCI device object matching the PCI bus id given domain, bus device and function PCI bus id...
Definition: helper.h:1215
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:632
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
hwloc_cuda_get_device_osdev_by_index
static hwloc_obj_t hwloc_cuda_get_device_osdev_by_index(hwloc_topology_t topology, unsigned idx)
Get the hwloc OS device object corresponding to the CUDA device whose index is idx.
Definition: cuda.h:203
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:543
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:566
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:543
hwloc_cpuset_t
hwloc_bitmap_t hwloc_cpuset_t
A CPU set is a bitmap whose bits are set according to CPU physical OS indexes.
Definition: hwloc.h:132
hwloc_obj::name
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:366
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:542
hwloc_bitmap_copy
void hwloc_bitmap_copy(hwloc_bitmap_t dst, hwloc_const_bitmap_t src)
Copy the contents of bitmap src into the already allocated bitmap dst.
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_linux_parse_cpumap_file
int hwloc_linux_parse_cpumap_file(FILE *file, hwloc_cpuset_t set)
Convert a linux kernel cpumap file file into hwloc CPU set.
HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:297
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:360
hwloc_cuda_get_device_cpuset
static int hwloc_cuda_get_device_cpuset(hwloc_topology_t topology, CUdevice cudevice, hwloc_cpuset_t set)
Get the CPU set of logical processors that are physically close to device cudevice.
Definition: cuda.h:92
hwloc_cuda_get_device_pci_ids
static int hwloc_cuda_get_device_pci_ids(hwloc_topology_t topology, CUdevice cudevice, int *domain, int *bus, int *dev)
Return the domain, bus and device IDs of the CUDA device cudevice.
Definition: cuda.h:47
hwloc_get_next_osdev
static hwloc_obj_t hwloc_get_next_osdev(hwloc_topology_t topology, hwloc_obj_t prev)
Get the next OS device in the system.
Definition: helper.h:1252
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:358
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?