Hardware Locality (hwloc): levelzero.h Source File

Hardware Locality (hwloc) 2.11.2

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
63static __hwloc_inline int
64hwloc_levelzero_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
65 ze_device_handle_t device, hwloc_cpuset_t set)
66{
67#ifdef HWLOC_LINUX_SYS
68 /* If we're on Linux, use the sysfs mechanism to get the local cpus */
69#define HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX 128
70 char path[HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX];
71 zes_pci_properties_t pci;
72 zes_device_handle_t sdevice = device;
73 ze_result_t res;
74
75 if (!hwloc_topology_is_thissystem(topology)) {
76 errno = EINVAL;
77 return -1;
78 }
79
80 res = zesDevicePciGetProperties(sdevice, &pci);
81 if (res != ZE_RESULT_SUCCESS) {
82 errno = EINVAL;
83 return -1;
84 }
85
86 sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/local_cpus",
87 pci.address.domain, pci.address.bus, pci.address.device, pci.address.function);
88 if (hwloc_linux_read_path_as_cpumask(path, set) < 0
89 || hwloc_bitmap_iszero(set))
90 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
91#else
92 /* Non-Linux systems simply get a full cpuset */
93 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
94#endif
95 return 0;
96}
97
112static __hwloc_inline hwloc_obj_t
113hwloc_levelzero_get_device_osdev(hwloc_topology_t topology, ze_device_handle_t device)
114{
115 zes_device_handle_t sdevice = device;
116 zes_pci_properties_t pci;
117 ze_result_t res;
118 hwloc_obj_t osdev;
119
120 if (!hwloc_topology_is_thissystem(topology)) {
121 errno = EINVAL;
122 return NULL;
123 }
124
125 res = zesDevicePciGetProperties(sdevice, &pci);
126 if (res != ZE_RESULT_SUCCESS) {
127 /* L0 was likely initialized without sysman, don't bother */
128 errno = EINVAL;
129 return NULL;
130 }
131
132 osdev = NULL;
133 while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
134 hwloc_obj_t pcidev = osdev->parent;
135
136 if (strncmp(osdev->name, "ze", 2))
137 continue;
138
139 if (pcidev
140 && pcidev->type == HWLOC_OBJ_PCI_DEVICE
141 && pcidev->attr->pcidev.domain == pci.address.domain
142 && pcidev->attr->pcidev.bus == pci.address.bus
143 && pcidev->attr->pcidev.dev == pci.address.device
144 && pcidev->attr->pcidev.func == pci.address.function)
145 return osdev;
146
147 /* FIXME: when we'll have serialnumber, try it in case PCI is filtered-out */
148 }
149
150 return NULL;
151}
152
156#ifdef __cplusplus
157} /* extern "C" */
158#endif
159
160
161#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: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:1290
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:64
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:113
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::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