| Message ID | 1348588579-16970-1-git-send-email-jiang.liu@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Tue, Sep 25, 2012 at 8:56 AM, Jiang Liu <liuj97@gmail.com> wrote: > From: Yinghai Lu <yinghai@kernel.org> > > use bus_find_device to loop host_bridges. > > Signed-off-by: Yinghai Lu <yinghai@kernel.org> > --- > drivers/pci/search.c | 22 ++++++++++++++++++++++ > include/linux/pci.h | 3 +++ > 2 files changed, 25 insertions(+) > > diff --git a/drivers/pci/search.c b/drivers/pci/search.c > index bf969ba..5e82905 100644 > --- a/drivers/pci/search.c > +++ b/drivers/pci/search.c > @@ -178,6 +178,28 @@ struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus, > } > EXPORT_SYMBOL(pci_get_domain_bus_and_slot); > > +static int match_pci_host_bridge(struct device *dev, void *data) > +{ > + return 1; > +} > + > +struct pci_bus *pci_get_next_root_bus(struct pci_bus *bus) > +{ > + struct device *dev; > + > + WARN_ON(in_interrupt()); > + dev = bus_find_device(&pci_host_bridge_bus_type, > + bus ? bus->bridge : NULL, > + NULL, > + match_pci_host_bridge); > + if (bus) > + put_device(bus->bridge); > + if (dev) > + return to_pci_host_bridge(dev)->bus; > + > + return NULL; > +} that interface is not good, bus could be not root bus. Also now we still have chance to have root bridge is there, but root bus already get removed ? Actually some root member should be in pci host bridge instead. So don't need to go deep to bus anymore. hope we should get rid of pci_bus. -Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/search.c b/drivers/pci/search.c index bf969ba..5e82905 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -178,6 +178,28 @@ struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus, } EXPORT_SYMBOL(pci_get_domain_bus_and_slot); +static int match_pci_host_bridge(struct device *dev, void *data) +{ + return 1; +} + +struct pci_bus *pci_get_next_root_bus(struct pci_bus *bus) +{ + struct device *dev; + + WARN_ON(in_interrupt()); + dev = bus_find_device(&pci_host_bridge_bus_type, + bus ? bus->bridge : NULL, + NULL, + match_pci_host_bridge); + if (bus) + put_device(bus->bridge); + if (dev) + return to_pci_host_bridge(dev)->bus; + + return NULL; +} + static int match_pci_dev_by_id(struct device *dev, void *data) { struct pci_dev *pdev = to_pci_dev(dev); diff --git a/include/linux/pci.h b/include/linux/pci.h index be1de01..54e8fa1 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -394,6 +394,8 @@ struct pci_host_bridge { }; #define to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev) +#define for_each_pci_root_bus(bus) while (bus = pci_get_next_root_bus(bus)) + void pci_set_host_bridge_release(struct pci_host_bridge *bridge, void (*release_fn)(struct pci_host_bridge *), void *release_data); @@ -757,6 +759,7 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap); int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap); struct pci_bus *pci_find_next_bus(const struct pci_bus *from); +struct pci_bus *pci_get_next_root_bus(struct pci_bus *from); struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from); struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,