Hardware Locality (hwloc): levelzero.h Source File

Hardware Locality (hwloc) 2.9.2

levelzero.h
1/*
2 * Copyright © 2021-2023 Inria. All rights reserved.
3 * See COPYING in top-level directory.
4 */
5
13#ifndef HWLOC_LEVELZERO_H
14#define HWLOC_LEVELZERO_H
15
16#include "hwloc.h"
17#include "hwloc/autogen/config.h"
18#include "hwloc/helper.h"
19#ifdef HWLOC_LINUX_SYS
20#include "hwloc/linux.h"
21#endif
22
23#include <level_zero/ze_api.h>
24#include <level_zero/zes_api.h>
25
26
27#ifdef __cplusplus
28extern "C" {
29#endif
30
31
62static __hwloc_inline int
63hwloc_levelzero_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
64 ze_device_handle_t device, hwloc_cpuset_t set)
65{
66#ifdef HWLOC_LINUX_SYS
67 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
68#define HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX 128
69 char path[HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX];
70 zes_pci_properties_t pci;
71 zes_device_handle_t sdevice = device;
72 ze_result_t res;
73
74 if (!hwloc_topology_is_thissystem(topology)) {
75 errno = EINVAL;
76 return -1;
77 }
78
79 res = zesDevicePciGetProperties(sdevice, &pci);
80 if (res != ZE_RESULT_SUCCESS) {
81 errno = EINVAL;
82 return -1;
83 }
84
85 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/local_cpus",
86 pci.address.domain, pci.address.bus, pci.address.device, pci.address.function);
87 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
88 || hwloc_bitmap_iszero(set))
89 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
90#else
91 /* Non-Linux systems simply get a full cpuset */
92 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
93#endif
94 return 0;
95}
96
111static __hwloc_inline hwloc_obj_t
112hwloc_levelzero_get_device_osdev(hwloc_topology_t topology, ze_device_handle_t device)
113{
114 zes_device_handle_t sdevice = device;
115 zes_pci_properties_t pci;
116 ze_result_t res;
117 hwloc_obj_t osdev;
118
119 if (!hwloc_topology_is_thissystem(topology)) {
120 errno = EINVAL;
121 return NULL;
122 }
123
124 res = zesDevicePciGetProperties(sdevice, &pci);
125 if (res != ZE_RESULT_SUCCESS) {
126 /* L0 was likely initialized without sysman, don't bother */
127 errno = EINVAL;
128 return NULL;
129 }
130
131 osdev = NULL;
132 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
133 hwloc_obj_t pcidev = osdev->parent;
134
135 if (strncmp(osdev->name, "ze", 2))
136 continue;
137
138 if (pcidev
139 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
140 && pcidev->attr->pcidev.domain == pci.address.domain
141 && pcidev->attr->pcidev.bus == pci.address.bus
142 && pcidev->attr->pcidev.dev == pci.address.device
143 && pcidev->attr->pcidev.func == pci.address.function)
144 return osdev;
145
146 /* FIXME: when we'll have serialnumber, try it in case PCI is filtered-out */
147 }
148
149 return NULL;
150}
151
155#ifdef __cplusplus
156} /* extern "C" */
157#endif
158
159
160#endif /* HWLOC_LEVELZERO_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_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_levelzero_get_device_cpuset
static int hwloc_levelzero_get_device_cpuset(hwloc_topology_t topology, ze_device_handle_t device, hwloc_cpuset_t set)
Get the CPU set of logical processors that are physically close to the Level Zero device device.
Definition: levelzero.h:63
hwloc_levelzero_get_device_osdev
static hwloc_obj_t hwloc_levelzero_get_device_osdev(hwloc_topology_t topology, ze_device_handle_t device)
Get the hwloc OS device object corresponding to Level Zero device device.
Definition: levelzero.h:112
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::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