opencl.h
/*
* Copyright © 2012-2023 Inria. All rights reserved.
* Copyright © 2013, 2018 Université Bordeaux. All right reserved.
* See COPYING in top-level directory.
*/
#ifndef HWLOC_OPENCL_H
#define HWLOC_OPENCL_H
#include "hwloc.h"
#include "hwloc/autogen/config.h"
#include "hwloc/helper.h"
#ifdef HWLOC_LINUX_SYS
#include "hwloc/linux.h"
#endif
#ifdef __APPLE__
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
/* OpenCL extensions aren't always shipped with default headers, and
* they don't always reflect what the installed implementations support.
* Try everything and let the implementation return errors when non supported.
*/
/* Copyright (c) 2008-2018 The Khronos Group Inc. */
/* needs "cl_amd_device_attribute_query" device extension, but not strictly required for clGetDeviceInfo() */
#define HWLOC_CL_DEVICE_TOPOLOGY_AMD 0x4037
typedef union {
struct { cl_uint type; cl_uint data[5]; } raw;
struct { cl_uint type; cl_char unused[17]; cl_char bus; cl_char device; cl_char function; } pcie;
} hwloc_cl_device_topology_amd;
#define HWLOC_CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD 1
/* needs "cl_nv_device_attribute_query" device extension, but not strictly required for clGetDeviceInfo() */
#define HWLOC_CL_DEVICE_PCI_BUS_ID_NV 0x4008
#define HWLOC_CL_DEVICE_PCI_SLOT_ID_NV 0x4009
#define HWLOC_CL_DEVICE_PCI_DOMAIN_ID_NV 0x400A
static __hwloc_inline int
hwloc_opencl_get_device_pci_busid(cl_device_id device,
unsigned *domain, unsigned *bus, unsigned *dev, unsigned *func)
{
hwloc_cl_device_topology_amd amdtopo;
cl_uint nvbus, nvslot, nvdomain;
cl_int clret;
clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_TOPOLOGY_AMD, sizeof(amdtopo), &amdtopo, NULL);
if (CL_SUCCESS == clret
&& HWLOC_CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD == amdtopo.raw.type) {
*domain = 0; /* can't do anything better */
/* cl_device_topology_amd stores bus ID in cl_char, dont convert those signed char directly to unsigned int */
*bus = (unsigned) (unsigned char) amdtopo.pcie.bus;
*dev = (unsigned) (unsigned char) amdtopo.pcie.device;
*func = (unsigned) (unsigned char) amdtopo.pcie.function;
return 0;
}
clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_PCI_BUS_ID_NV, sizeof(nvbus), &nvbus, NULL);
if (CL_SUCCESS == clret) {
clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_PCI_SLOT_ID_NV, sizeof(nvslot), &nvslot, NULL);
if (CL_SUCCESS == clret) {
clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_PCI_DOMAIN_ID_NV, sizeof(nvdomain), &nvdomain, NULL);
if (CL_SUCCESS == clret) { /* available since CUDA 10.2 */
*domain = nvdomain;
} else {
*domain = 0;
}
*bus = nvbus & 0xff;
/* non-documented but used in many other projects */
*dev = nvslot >> 3;
*func = nvslot & 0x7;
return 0;
}
}
return -1;
}
static __hwloc_inline int
hwloc_opencl_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
cl_device_id device __hwloc_attribute_unused,
hwloc_cpuset_t set)
{
#if (defined HWLOC_LINUX_SYS)
/* If we're on Linux, try AMD/NVIDIA extensions + the sysfs mechanism to get the local cpus */
#define HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX 128
char path[HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX];
unsigned pcidomain, pcibus, pcidev, pcifunc;
if (!hwloc_topology_is_thissystem(topology)) {
errno = EINVAL;
return -1;
}
if (hwloc_opencl_get_device_pci_busid(device, &pcidomain, &pcibus, &pcidev, &pcifunc) < 0) {
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
return 0;
}
sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/local_cpus", pcidomain, pcibus, pcidev, pcifunc);
if (hwloc_linux_read_path_as_cpumask(path, set) < 0
|| hwloc_bitmap_iszero(set))
hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#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_opencl_get_device_osdev_by_index(hwloc_topology_t topology,
unsigned platform_index, unsigned device_index)
{
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_COPROC == osdev->attr->osdev.type
&& osdev->name
&& sscanf(osdev->name, "opencl%ud%u", &x, &y) == 2
&& platform_index == x && device_index == y)
return osdev;
}
return NULL;
}
static __hwloc_inline hwloc_obj_t
hwloc_opencl_get_device_osdev(hwloc_topology_t topology __hwloc_attribute_unused,
cl_device_id device __hwloc_attribute_unused)
{
hwloc_obj_t osdev;
unsigned pcidomain, pcibus, pcidevice, pcifunc;
if (hwloc_opencl_get_device_pci_busid(device, &pcidomain, &pcibus, &pcidevice, &pcifunc) < 0) {
errno = EINVAL;
return NULL;
}
osdev = NULL;
while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
hwloc_obj_t pcidev = osdev->parent;
if (strncmp(osdev->name, "opencl", 6))
continue;
if (pcidev
&& pcidev->type == HWLOC_OBJ_PCI_DEVICE
&& pcidev->attr->pcidev.domain == pcidomain
&& pcidev->attr->pcidev.bus == pcibus
&& pcidev->attr->pcidev.dev == pcidevice
&& pcidev->attr->pcidev.func == pcifunc)
return osdev;
/* if PCI are filtered out, we need a info attr to match on */
}
return NULL;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_OPENCL_H */
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:161
HWLOC_OBJ_OSDEV_COPROC
@ HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "opencl0d0" for a OpenCL device,...
Definition: hwloc.h:385
HWLOC_OBJ_PCI_DEVICE
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:295
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:742
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_topology_get_complete_cpuset
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
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:1282
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
hwloc_bitmap_copy
int 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_linux_read_path_as_cpumask
int hwloc_linux_read_path_as_cpumask(const char *path, hwloc_bitmap_t set)
Convert a linux kernel cpumask file path into a hwloc bitmap set.
hwloc_opencl_get_device_pci_busid
static int hwloc_opencl_get_device_pci_busid(cl_device_id device, unsigned *domain, unsigned *bus, unsigned *dev, unsigned *func)
Return the domain, bus and device IDs of the OpenCL device device.
Definition: opencl.h:77
hwloc_opencl_get_device_cpuset
static int hwloc_opencl_get_device_cpuset(hwloc_topology_t topology, cl_device_id device, hwloc_cpuset_t set)
Get the CPU set of processors that are physically close to OpenCL device device.
Definition: opencl.h:137
hwloc_opencl_get_device_osdev
static hwloc_obj_t hwloc_opencl_get_device_osdev(hwloc_topology_t topology, cl_device_id device)
Get the hwloc OS device object corresponding to OpenCL device deviceX.
Definition: opencl.h:221
hwloc_opencl_get_device_osdev_by_index
static hwloc_obj_t hwloc_opencl_get_device_osdev_by_index(hwloc_topology_t topology, unsigned platform_index, unsigned device_index)
Get the hwloc OS device object corresponding to the OpenCL device for the given indexes.
Definition: opencl.h:184
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:431
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:443
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:433
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:450
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:481
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Device number (zz in the PCI BDF notation xxxx:yy:zz.t).
Definition: hwloc.h:677
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Function number (t in the PCI BDF notation xxxx:yy:zz.t).
Definition: hwloc.h:678
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Domain number (xxxx in the PCI BDF notation xxxx:yy:zz.t). Only 16bits PCI domains are supported by d...
Definition: hwloc.h:670
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Bus number (yy in the PCI BDF notation xxxx:yy:zz.t).
Definition: hwloc.h:676
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:716
hwloc_cl_device_topology_amd
Definition: opencl.h:46
hwloc_cl_device_topology_amd::device
cl_char device
Definition: opencl.h:48
hwloc_cl_device_topology_amd::bus
cl_char bus
Definition: opencl.h:48
hwloc_cl_device_topology_amd::function
cl_char function
Definition: opencl.h:48
hwloc_cl_device_topology_amd::type
cl_uint type
Definition: opencl.h:47
hwloc_cl_device_topology_amd::raw
struct hwloc_cl_device_topology_amd::@0 raw
hwloc_cl_device_topology_amd::pcie
struct hwloc_cl_device_topology_amd::@1 pcie