drivers/pci/host-bridge.c

Source file repositories/reference/linux-study-clean/drivers/pci/host-bridge.c

File Facts

System
Linux kernel
Corpus path
drivers/pci/host-bridge.c
Extension
.c
Size
2509 bytes
Lines
103
Domain
Representative Device Path
Bucket
PCIe NVMe Storage Path
Inferred role
Representative Device Path: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

Dependency Surface

Detected Declarations

Annotated Snippet

if (resource_contains(window->res, res)) {
			offset = window->offset;
			break;
		}
	}

	region->start = res->start - offset;
	region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);

static bool region_contains(struct pci_bus_region *region1,
			    struct pci_bus_region *region2)
{
	return region1->start <= region2->start && region1->end >= region2->end;
}

void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
			     struct pci_bus_region *region)
{
	struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
	struct resource_entry *window;
	resource_size_t offset = 0;

	resource_list_for_each_entry(window, &bridge->windows) {
		struct pci_bus_region bus_region;

		if (resource_type(res) != resource_type(window->res))
			continue;

		bus_region.start = window->res->start - window->offset;
		bus_region.end = window->res->end - window->offset;

		if (region_contains(&bus_region, region)) {
			offset = window->offset;
			break;
		}
	}

	res->start = region->start + offset;
	res->end = region->end + offset;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);

Annotation

Implementation Notes