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pci: track parent<->child relationship 

So that PCI devices hang down from bridges and root
bridges down from the PCI host controller when
calling devinfo.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Lucas Stach 2014-10-04 19:40:14 +02:00 committed by Sascha Hauer
parent 48f88df158
commit 490d4fe417
2 changed files with 6 additions and 0 deletions
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4
drivers/pci/pci.c
View File

@ -40,6 +40,7 @@ void register_pci_controller(struct pci_controller *hose)
bus = pci_alloc_bus();
hose->bus = bus;
bus->parent = hose->parent;
bus->host = hose;
bus->ops = hose->pci_ops;
bus->resource[PCI_BUS_RESOURCE_MEM] = hose->mem_resource;
@ -309,6 +310,7 @@ unsigned int pci_scan_bus(struct pci_bus *bus)
dev->devfn = devfn;
dev->vendor = l & 0xffff;
dev->device = (l >> 16) & 0xffff;
dev->dev.parent = bus->parent;
/* non-destructively determine if device can be a master: */
pci_read_config_byte(dev, PCI_COMMAND, &cmd);
@ -354,6 +356,8 @@ unsigned int pci_scan_bus(struct pci_bus *bus)
bus->resource[PCI_BUS_RESOURCE_MEM_PREF];
child_bus->resource[PCI_BUS_RESOURCE_IO] =
bus->resource[PCI_BUS_RESOURCE_IO];
child_bus->parent = &dev->dev;
child_bus->number = bus_index++;
list_add_tail(&child_bus->node, &bus->children);
dev->subordinate = child_bus;

2
include/linux/pci.h
View File

@ -122,6 +122,7 @@ enum {
};
struct pci_bus {
struct pci_controller *host; /* associated host controller */
struct device_d *parent;
struct list_head node; /* node in list of buses */
struct list_head children; /* list of child buses */
struct list_head devices; /* list of devices on this bus */
@ -158,6 +159,7 @@ extern struct pci_ops *pci_ops;
*/
struct pci_controller {
struct pci_controller *next;
struct device_d *parent;
struct pci_bus *bus;
struct pci_ops *pci_ops;