Hardware Locality (hwloc)  2.10.0
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
28 extern "C" {
29 #endif
30 
31 
63 static __hwloc_inline int
64 hwloc_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))
91 #else
92  /* Non-Linux systems simply get a full cpuset */
94 #endif
95  return 0;
96 }
97 
112 static __hwloc_inline hwloc_obj_t
113 hwloc_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_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
PCI device (filtered out by default).
Definition: hwloc.h:295
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:742
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
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
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
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.
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.
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
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
Structure of a topology object.
Definition: hwloc.h:431
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_t type
Type of object.
Definition: hwloc.h:433
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:450
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:481
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
unsigned char dev
Device number (zz in the PCI BDF notation xxxx:yy:zz.t).
Definition: hwloc.h:677
unsigned char func
Function number (t in the PCI BDF notation xxxx:yy:zz.t).
Definition: hwloc.h:678
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
unsigned char bus
Bus number (yy in the PCI BDF notation xxxx:yy:zz.t).
Definition: hwloc.h:676