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Portable Hardware Locality (hwloc) Documentation: v2.7.0

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levelzero.h
1 /*
2  * Copyright © 2021 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 
59 static __hwloc_inline int
60 hwloc_levelzero_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
61  ze_device_handle_t device, hwloc_cpuset_t set)
62 {
63 #ifdef HWLOC_LINUX_SYS
64  /* If we're on Linux, use the sysfs mechanism to get the local cpus */
65 #define HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX 128
66  char path[HWLOC_LEVELZERO_DEVICE_SYSFS_PATH_MAX];
67  zes_pci_properties_t pci;
68  zes_device_handle_t sdevice = device;
69  ze_result_t res;
70 
71  if (!hwloc_topology_is_thissystem(topology)) {
72  errno = EINVAL;
73  return -1;
74  }
75 
76  res = zesDevicePciGetProperties(sdevice, &pci);
77  if (res != ZE_RESULT_SUCCESS) {
78  errno = EINVAL;
79  return -1;
80  }
81 
82  sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/local_cpus",
83  pci.address.domain, pci.address.bus, pci.address.device, pci.address.function);
84  if (hwloc_linux_read_path_as_cpumask(path, set) < 0
85  || hwloc_bitmap_iszero(set))
87 #else
88  /* Non-Linux systems simply get a full cpuset */
90 #endif
91  return 0;
92 }
93 
108 static __hwloc_inline hwloc_obj_t
109 hwloc_levelzero_get_device_osdev(hwloc_topology_t topology, ze_device_handle_t device)
110 {
111  zes_device_handle_t sdevice = device;
112  zes_pci_properties_t pci;
113  ze_result_t res;
114  hwloc_obj_t osdev;
115 
116  if (!hwloc_topology_is_thissystem(topology)) {
117  errno = EINVAL;
118  return NULL;
119  }
120 
121  res = zesDevicePciGetProperties(sdevice, &pci);
122  if (res != ZE_RESULT_SUCCESS) {
123  /* L0 was likely initialized without sysman, don't bother */
124  errno = EINVAL;
125  return NULL;
126  }
127 
128  osdev = NULL;
129  while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
130  hwloc_obj_t pcidev = osdev->parent;
131 
132  if (strncmp(osdev->name, "ze", 2))
133  continue;
134 
135  if (pcidev
136  && pcidev->type == HWLOC_OBJ_PCI_DEVICE
137  && pcidev->attr->pcidev.domain == pci.address.domain
138  && pcidev->attr->pcidev.bus == pci.address.bus
139  && pcidev->attr->pcidev.dev == pci.address.device
140  && pcidev->attr->pcidev.func == pci.address.function)
141  return osdev;
142 
143  /* FIXME: when we'll have serialnumber, try it in case PCI is filtered-out */
144  }
145 
146  return NULL;
147 }
148 
152 #ifdef __cplusplus
153 } /* extern "C" */
154 #endif
155 
156 
157 #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:140
@ HWLOC_OBJ_PCI_DEVICE
PCI device (filtered out by default).
Definition: hwloc.h:269
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:692
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:1194
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:60
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:109
Structure of a topology object.
Definition: hwloc.h:396
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:408
hwloc_obj_type_t type
Type of object.
Definition: hwloc.h:398
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:415
struct hwloc_obj * parent
Parent, NULL if root (Machine object)
Definition: hwloc.h:446
struct hwloc_obj_attr_u::hwloc_pcidev_attr_s pcidev
unsigned char dev
Definition: hwloc.h:639
unsigned char func
Definition: hwloc.h:639
unsigned short domain
Definition: hwloc.h:635
unsigned char bus
Definition: hwloc.h:639