arch/x86/pci/bus_numa.c
Source file repositories/reference/linux-study-clean/arch/x86/pci/bus_numa.c
File Facts
- System
- Linux kernel
- Corpus path
arch/x86/pci/bus_numa.c- Extension
.c- Size
- 3150 bytes
- Lines
- 147
- Domain
- Architecture Layer
- Bucket
- arch/x86
- Inferred role
- Architecture Layer: implementation source
- Status
- source implementation candidate
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/init.hlinux/pci.hlinux/range.hbus_numa.h
Detected Declarations
function x86_pci_root_bus_nodefunction x86_pci_root_bus_resourcesfunction update_res
Annotated Snippet
if (window->res->flags & IORESOURCE_BUS) {
found = true;
break;
}
if (!found)
pci_add_resource(resources, &info->busn);
list_for_each_entry(root_res, &info->resources, list)
pci_add_resource(resources, &root_res->res);
return;
default_resources:
/*
* We don't have any host bridge aperture information from the
* "native host bridge drivers," e.g., amd_bus or broadcom_bus,
* so fall back to the defaults historically used by pci_create_bus().
*/
printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
pci_add_resource(resources, &ioport_resource);
pci_add_resource(resources, &iomem_resource);
}
struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
int node, int link)
{
struct pci_root_info *info;
info = kzalloc_obj(*info);
if (!info)
return info;
sprintf(info->name, "PCI Bus #%02x", bus_min);
INIT_LIST_HEAD(&info->resources);
info->busn.name = info->name;
info->busn.start = bus_min;
info->busn.end = bus_max;
info->busn.flags = IORESOURCE_BUS;
info->node = node;
info->link = link;
list_add_tail(&info->list, &pci_root_infos);
return info;
}
void update_res(struct pci_root_info *info, resource_size_t start,
resource_size_t end, unsigned long flags, int merge)
{
struct resource *res;
struct pci_root_res *root_res;
if (start > end)
return;
if (start == RESOURCE_SIZE_MAX)
return;
if (!merge)
goto addit;
/* try to merge it with old one */
list_for_each_entry(root_res, &info->resources, list) {
resource_size_t final_start, final_end;
resource_size_t common_start, common_end;
res = &root_res->res;
if (res->flags != flags)
continue;
common_start = max(res->start, start);
common_end = min(res->end, end);
if (common_start > common_end + 1)
continue;
final_start = min(res->start, start);
final_end = max(res->end, end);
res->start = final_start;
res->end = final_end;
return;
}
addit:
/* need to add that */
root_res = kzalloc_obj(*root_res);
Annotation
- Immediate include surface: `linux/init.h`, `linux/pci.h`, `linux/range.h`, `bus_numa.h`.
- Detected declarations: `function x86_pci_root_bus_node`, `function x86_pci_root_bus_resources`, `function update_res`.
- Atlas domain: Architecture Layer / arch/x86.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.