Hardware Locality (hwloc): opencl.h Source File

Hardware Locality (hwloc) 2.9.3

opencl.h
1/*
2 * Copyright © 2012-2023 Inria. All rights reserved.
3 * Copyright © 2013, 2018 Université Bordeaux. All right reserved.
4 * See COPYING in top-level directory.
5 */
6
14#ifndef HWLOC_OPENCL_H
15#define HWLOC_OPENCL_H
16
17#include "hwloc.h"
18#include "hwloc/autogen/config.h"
19#include "hwloc/helper.h"
20#ifdef HWLOC_LINUX_SYS
21#include "hwloc/linux.h"
22#endif
23
24#ifdef __APPLE__
25#include <OpenCL/cl.h>
26#else
27#include <CL/cl.h>
28#endif
29
30#include <stdio.h>
31
32
33#ifdef __cplusplus
34extern "C" {
35#endif
36
37
38/* OpenCL extensions aren't always shipped with default headers, and
39 * they don't always reflect what the installed implementations support.
40 * Try everything and let the implementation return errors when non supported.
41 */
42/* Copyright (c) 2008-2018 The Khronos Group Inc. */
43
44/* needs "cl_amd_device_attribute_query" device extension, but not strictly required for clGetDeviceInfo() */
45#define HWLOC_CL_DEVICE_TOPOLOGY_AMD 0x4037
46 typedef union {
47 struct { cl_uint type; cl_uint data[5]; } raw;
48 struct { cl_uint type; cl_char unused[17]; cl_char bus; cl_char device; cl_char function; } pcie;
49} hwloc_cl_device_topology_amd;
50#define HWLOC_CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD 1
51
52/* needs "cl_nv_device_attribute_query" device extension, but not strictly required for clGetDeviceInfo() */
53#define HWLOC_CL_DEVICE_PCI_BUS_ID_NV 0x4008
54#define HWLOC_CL_DEVICE_PCI_SLOT_ID_NV 0x4009
55#define HWLOC_CL_DEVICE_PCI_DOMAIN_ID_NV 0x400A
56
57
76static __hwloc_inline int
77hwloc_opencl_get_device_pci_busid(cl_device_id device,
78 unsigned *domain, unsigned *bus, unsigned *dev, unsigned *func)
79{
80 hwloc_cl_device_topology_amd amdtopo;
81 cl_uint nvbus, nvslot, nvdomain;
82 cl_int clret;
83
84 clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_TOPOLOGY_AMD, sizeof(amdtopo), &amdtopo, NULL);
85 if (CL_SUCCESS == clret
86 && HWLOC_CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD == amdtopo.raw.type) {
87 *domain = 0; /* can't do anything better */
88 /* cl_device_topology_amd stores bus ID in cl_char, dont convert those signed char directly to unsigned int */
89 *bus = (unsigned) (unsigned char) amdtopo.pcie.bus;
90 *dev = (unsigned) (unsigned char) amdtopo.pcie.device;
91 *func = (unsigned) (unsigned char) amdtopo.pcie.function;
92 return 0;
93 }
94
95 clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_PCI_BUS_ID_NV, sizeof(nvbus), &nvbus, NULL);
96 if (CL_SUCCESS == clret) {
97 clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_PCI_SLOT_ID_NV, sizeof(nvslot), &nvslot, NULL);
98 if (CL_SUCCESS == clret) {
99 clret = clGetDeviceInfo(device, HWLOC_CL_DEVICE_PCI_DOMAIN_ID_NV, sizeof(nvdomain), &nvdomain, NULL);
100 if (CL_SUCCESS == clret) { /* available since CUDA 10.2 */
101 *domain = nvdomain;
102 } else {
103 *domain = 0;
104 }
105 *bus = nvbus & 0xff;
106 /* non-documented but used in many other projects */
107 *dev = nvslot >> 3;
108 *func = nvslot & 0x7;
109 return 0;
110 }
111 }
112
113 return -1;
114}
115
136static __hwloc_inline int
137hwloc_opencl_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
138 cl_device_id device __hwloc_attribute_unused,
139 hwloc_cpuset_t set)
140{
141#if (defined HWLOC_LINUX_SYS)
142 /* If we're on Linux, try AMD/NVIDIA extensions + the sysfs mechanism to get the local cpus */
143#define HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX 128
144 char path[HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX];
145 unsigned pcidomain, pcibus, pcidev, pcifunc;
146
147 if (!hwloc_topology_is_thissystem(topology)) {
148 errno = EINVAL;
149 return -1;
150 }
151
152 if (hwloc_opencl_get_device_pci_busid(device, &pcidomain, &pcibus, &pcidev, &pcifunc) < 0) {
153 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
154 return 0;
155 }
156
157 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/local_cpus", pcidomain, pcibus, pcidev, pcifunc);
158 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
159 || hwloc_bitmap_iszero(set))
160 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
161#else
162 /* Non-Linux systems simply get a full cpuset */
163 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
164#endif
165 return 0;
166}
167
183static __hwloc_inline hwloc_obj_t
184hwloc_opencl_get_device_osdev_by_index(hwloc_topology_t topology,
185 unsigned platform_index, unsigned device_index)
186{
187 unsigned x = (unsigned) -1, y = (unsigned) -1;
188 hwloc_obj_t osdev = NULL;
189 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
190 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
191 && osdev->name
192 && sscanf(osdev->name, "opencl%ud%u", &x, &y) == 2
193 && platform_index == x && device_index == y)
194 return osdev;
195 }
196 return NULL;
197}
198
220static __hwloc_inline hwloc_obj_t
221hwloc_opencl_get_device_osdev(hwloc_topology_t topology __hwloc_attribute_unused,
222 cl_device_id device __hwloc_attribute_unused)
223{
224 hwloc_obj_t osdev;
225 unsigned pcidomain, pcibus, pcidevice, pcifunc;
226
227 if (hwloc_opencl_get_device_pci_busid(device, &pcidomain, &pcibus, &pcidevice, &pcifunc) < 0) {
228 errno = EINVAL;
229 return NULL;
230 }
231
232 osdev = NULL;
233 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
234 hwloc_obj_t pcidev = osdev->parent;
235 if (strncmp(osdev->name, "opencl", 6))
236 continue;
237 if (pcidev
238 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
239 && pcidev->attr->pcidev.domain == pcidomain
240 && pcidev->attr->pcidev.bus == pcibus
241 && pcidev->attr->pcidev.dev == pcidevice
242 && pcidev->attr->pcidev.func == pcifunc)
243 return osdev;
244 /* if PCI are filtered out, we need a info attr to match on */
245 }
246
247 return NULL;
248}
249
253#ifdef __cplusplus
254} /* extern "C" */
255#endif
256
257
258#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:374
HWLOC_OBJ_PCI_DEVICE
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:290
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:716
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:1280
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:420
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:432
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:422
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:439
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:470
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
Definition: hwloc.h:663
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:663
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:659
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:663
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:690
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::pcie
struct hwloc_cl_device_topology_amd::@4 pcie
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::raw
struct hwloc_cl_device_topology_amd::@3 raw
hwloc_cl_device_topology_amd::type
cl_uint type
Definition: opencl.h:47