Hardware Locality (hwloc)  v2.9-20240515.2021.gitc804b6c6
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 
62 static __hwloc_inline int
63 hwloc_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))
90 #else
91  /* Non-Linux systems simply get a full cpuset */
93 #endif
94  return 0;
95 }
96 
111 static __hwloc_inline hwloc_obj_t
112 hwloc_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_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:438
hwloc_topology_get_complete_cpuset
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
hwloc_bitmap_iszero
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
hwloc_obj_attr_u::hwloc_pcidev_attr_s::bus
unsigned char bus
Definition: hwloc.h:669
hwloc_obj_attr_u::hwloc_pcidev_attr_s::domain
unsigned short domain
Definition: hwloc.h:665
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_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_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::type
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:428
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_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_OBJ_PCI_DEVICE
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:290
hwloc_obj_attr_u::hwloc_pcidev_attr_s::dev
unsigned char dev
Definition: hwloc.h:669
hwloc_obj_attr_u::pcidev
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
hwloc_obj::parent
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:476
hwloc_topology_is_thissystem
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:722
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:445
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_obj
Structure of a topology object.
Definition: hwloc.h:426
hwloc_obj_attr_u::hwloc_pcidev_attr_s::func
unsigned char func
Definition: hwloc.h:669