Hardware Locality (hwloc) 1.10.0

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opencl.h
1 /*
2 * Copyright © 2012-2013 Inria. All rights reserved.
3 * Copyright © 2013 Université Bordeaux 1. 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 #include <CL/cl.h>
25 #include <CL/cl_ext.h>
26
27 #include <stdio.h>
28
29
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33
34
63 static __hwloc_inline int
64 hwloc_opencl_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
65 cl_device_id device __hwloc_attribute_unused,
66 hwloc_cpuset_t set)
67 {
68 #if (defined HWLOC_LINUX_SYS) && (defined CL_DEVICE_TOPOLOGY_AMD)
69 /* If we're on Linux + AMD OpenCL, use the AMD extension + the sysfs mechanism to get the local cpus */
70 #define HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX 128
71 char path[HWLOC_OPENCL_DEVICE_SYSFS_PATH_MAX];
72 FILE *sysfile = NULL;
73 cl_device_topology_amd amdtopo;
74 cl_int clret;
75
76 if (!hwloc_topology_is_thissystem(topology)) {
77 errno = EINVAL;
78 return -1;
79 }
80
81 clret = clGetDeviceInfo(device, CL_DEVICE_TOPOLOGY_AMD, sizeof(amdtopo), &amdtopo, NULL);
82 if (CL_SUCCESS != clret) {
83 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
84 return 0;
85 }
86 if (CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD != amdtopo.raw.type) {
87 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
88 return 0;
89 }
90
91 sprintf(path, "/sys/bus/pci/devices/0000:%02x:%02x.%01x/local_cpus", amdtopo.pcie.bus, amdtopo.pcie.device, amdtopo.pcie.function);
92 sysfile = fopen(path, "r");
93 if (!sysfile)
94 return -1;
95
96 hwloc_linux_parse_cpumap_file(sysfile, set);
97 if (hwloc_bitmap_iszero(set))
98 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
99
100 fclose(sysfile);
101 #else
102 /* Non-Linux + AMD OpenCL systems simply get a full cpuset */
103 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
104 #endif
105 return 0;
106 }
107
123 static __hwloc_inline hwloc_obj_t
124 hwloc_opencl_get_device_osdev_by_index(hwloc_topology_t topology,
125 unsigned platform_index, unsigned device_index)
126 {
127 unsigned x = (unsigned) -1, y = (unsigned) -1;
128 hwloc_obj_t osdev = NULL;
129 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
130 if (HWLOC_OBJ_OSDEV_COPROC == osdev->attr->osdev.type
131 && osdev->name
132 && sscanf(osdev->name, "opencl%ud%u", &x, &y) == 2
133 && platform_index == x && device_index == y)
134 return osdev;
135 }
136 return NULL;
137 }
138
152 static __hwloc_inline hwloc_obj_t
153 hwloc_opencl_get_device_osdev(hwloc_topology_t topology __hwloc_attribute_unused,
154 cl_device_id device __hwloc_attribute_unused)
155 {
156 #ifdef CL_DEVICE_TOPOLOGY_AMD
157 hwloc_obj_t osdev;
158 cl_device_topology_amd amdtopo;
159 cl_int clret;
160
161 clret = clGetDeviceInfo(device, CL_DEVICE_TOPOLOGY_AMD, sizeof(amdtopo), &amdtopo, NULL);
162 if (CL_SUCCESS != clret) {
163 errno = EINVAL;
164 return NULL;
165 }
166 if (CL_DEVICE_TOPOLOGY_TYPE_PCIE_AMD != amdtopo.raw.type) {
167 errno = EINVAL;
168 return NULL;
169 }
170
171 osdev = NULL;
172 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
173 hwloc_obj_t pcidev = osdev->parent;
174 if (strncmp(osdev->name, "opencl", 6))
175 continue;
176 if (pcidev
177 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
178 && pcidev->attr->pcidev.domain == 0
179 && pcidev->attr->pcidev.bus == amdtopo.pcie.bus
180 && pcidev->attr->pcidev.dev == amdtopo.pcie.device
181 && pcidev->attr->pcidev.func == amdtopo.pcie.function)
182 return osdev;
183 }
184
185 return NULL;
186 #else
187 return NULL;
188 #endif
189 }
190
194 #ifdef __cplusplus
195 } /* extern "C" */
196 #endif
197
198
199 #endif /* HWLOC_OPENCL_H */
hwloc_obj_attr_u::hwloc_osdev_attr_s::type
hwloc_obj_osdev_type_t type
Definition: hwloc.h:528
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (system object)
Definition: hwloc.h:365
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_obj::name
char * name
Object description if any.
Definition: hwloc.h:343
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:124
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:505
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:782
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:505
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:1231
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::attr
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:347
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:505
HWLOC_OBJ_OSDEV_COPROC
Operating system co-processor device. For instance "mic0" for a Xeon Phi (MIC) on Linux...
Definition: hwloc.h:278
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:504
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:228
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
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_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 logical processors that are physically close to OpenCL device device.
Definition: opencl.h:64
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:122
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:585
hwloc_obj::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:341
hwloc_obj_attr_u::osdev
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
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 device.
Definition: opencl.h:153
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:339