>> For allocating resource under bus path, we do have dev pass along,
>> and we could just use bus instead. Also, we'd like to make function
>> find_pci_host_bridge() global so that some platforms (e.g. PPC) can
>> access the pci host bridge directly.
>
>This patch appears to have multiple unrelated changes:
>
> - change "struct pci_bus *bus" to "struct pci_bus *root_bus"
> - change find_pci_host_bridge() argument from dev to bus
> - fiddle with pcibios_bus_to_resource() and pcibios_resource_to_bus()
>
Leave those questions to Yinghai.
>These should be split out to make your patches easier to review.
>
I will split it for easy review :-)
>What's the rationale for preferring the pci_bus over the pci_dev?
>
We probablly need retrieve the pci_host_bridge through pci_bus
and pci_dev. When converting pci_dev to pci_host_bridge, we can
simply pass "pci_dev->bus".
Thanks,
Gavin
>> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
>> ---
>> drivers/pci/host-bridge.c | 34 +++++++++++++++++++++-------------
>> include/linux/pci.h | 4 ++++
>> 2 files changed, 25 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
>> index a68dc61..4ccf477 100644
>> --- a/drivers/pci/host-bridge.c
>> +++ b/drivers/pci/host-bridge.c
>> @@ -9,22 +9,19 @@
>>
>> #include "pci.h"
>>
>> -static struct pci_bus *find_pci_root_bus(struct pci_dev *dev)
>> +static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
>> {
>> - struct pci_bus *bus;
>> -
>> - bus = dev->bus;
>> while (bus->parent)
>> bus = bus->parent;
>>
>> return bus;
>> }
>>
>> -static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev)
>> +struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
>> {
>> - struct pci_bus *bus = find_pci_root_bus(dev);
>> + struct pci_bus *root_bus = find_pci_root_bus(bus);
>>
>> - return to_pci_host_bridge(bus->bridge);
>> + return to_pci_host_bridge(root_bus->bridge);
>> }
>>
>> void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
>> @@ -40,10 +37,11 @@ static bool resource_contains(struct resource *res1, struct resource *res2)
>> return res1->start <= res2->start && res1->end >= res2->end;
>> }
>>
>> -void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
>> - struct resource *res)
>> +void __pcibios_resource_to_bus(struct pci_bus *bus,
>> + struct pci_bus_region *region,
>> + struct resource *res)
>> {
>> - struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
>> + struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
>> struct pci_host_bridge_window *window;
>> resource_size_t offset = 0;
>>
>> @@ -60,6 +58,11 @@ void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
>> region->start = res->start - offset;
>> region->end = res->end - offset;
>> }
>> +void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
>> + struct resource *res)
>> +{
>> + __pcibios_resource_to_bus(dev->bus, region, res);
>> +}
>> EXPORT_SYMBOL(pcibios_resource_to_bus);
>>
>> static bool region_contains(struct pci_bus_region *region1,
>> @@ -68,10 +71,10 @@ static bool region_contains(struct pci_bus_region *region1,
>> return region1->start <= region2->start && region1->end >= region2->end;
>> }
>>
>> -void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
>> - struct pci_bus_region *region)
>> +static void __pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
>> + struct pci_bus_region *region)
>> {
>> - struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
>> + struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
>> struct pci_host_bridge_window *window;
>> resource_size_t offset = 0;
>>
>> @@ -93,4 +96,9 @@ void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
>> res->start = region->start + offset;
>> res->end = region->end + offset;
>> }
>> +void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
>> + struct pci_bus_region *region)
>> +{
>> + __pcibios_bus_to_resource(dev->bus, res, region);
>> +}
>> EXPORT_SYMBOL(pcibios_bus_to_resource);
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index fefb4e1..2b559f1 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -385,6 +385,7 @@ struct pci_host_bridge {
>> };
>>
>> #define to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
>> +struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus);
>> void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
>> void (*release_fn)(struct pci_host_bridge *),
>> void *release_data);
>> @@ -657,6 +658,9 @@ void pci_fixup_cardbus(struct pci_bus *);
>>
>> /* Generic PCI functions used internally */
>>
>> +void __pcibios_resource_to_bus(struct pci_bus *bus,
>> + struct pci_bus_region *region,
>> + struct resource *res);
>> void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
>> struct resource *res);
>> void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
>> --
>> 1.7.9.5
>>
>
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