On 01/13/2013 07:49 AM, Rafael J. Wysocki wrote:
> On Friday, January 11, 2013 02:40:48 PM Yinghai Lu wrote:
>> with that we could move out attaching driver for pci device,
>> out of device_add for pci hot add path.
>>
>> pci_bus_attach_device() will attach driver to pci device.
>
> Clever, but I wonder why exactly we need to do that?
Hi Rafael,
To make following sequence possible,
1) Create PCI device objects for hot-added PCI host bridge
2) Create IOMMU devices for DMAR units belong to the hot-added PCI host bridge
3) Bind and start all PCI devices connected to the PCI host bridge.
Regards!
Gerry
>
> Rafael
>
>
>> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
>> ---
>> drivers/pci/bus.c | 10 ++++++++++
>> drivers/pci/pci-driver.c | 6 +++++-
>> include/linux/pci.h | 1 +
>> 3 files changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
>> index 5f9c728..1f5916a 100644
>> --- a/drivers/pci/bus.c
>> +++ b/drivers/pci/bus.c
>> @@ -160,6 +160,15 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
>>
>> void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
>>
>> +static void pci_bus_attach_device(struct pci_dev *dev)
>> +{
>> + int ret;
>> +
>> + dev->match_driver = true;
>> + ret = device_attach(&dev->dev);
>> + WARN_ON(ret < 0);
>> +}
>> +
>> /**
>> * pci_bus_add_device - add a single device
>> * @dev: device to add
>> @@ -181,6 +190,7 @@ int pci_bus_add_device(struct pci_dev *dev)
>> if (retval)
>> return retval;
>>
>> + pci_bus_attach_device(dev);
>> dev->is_added = 1;
>> pci_proc_attach_device(dev);
>> pci_create_sysfs_dev_files(dev);
>> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
>> index f79cbcd..acdcc3c 100644
>> --- a/drivers/pci/pci-driver.c
>> +++ b/drivers/pci/pci-driver.c
>> @@ -1186,9 +1186,13 @@ pci_dev_driver(const struct pci_dev *dev)
>> static int pci_bus_match(struct device *dev, struct device_driver *drv)
>> {
>> struct pci_dev *pci_dev = to_pci_dev(dev);
>> - struct pci_driver *pci_drv = to_pci_driver(drv);
>> + struct pci_driver *pci_drv;
>> const struct pci_device_id *found_id;
>>
>> + if (!pci_dev->match_driver)
>> + return 0;
>> +
>> + pci_drv = to_pci_driver(drv);
>> found_id = pci_match_device(pci_drv, pci_dev);
>> if (found_id)
>> return 1;
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index 907b455..d73af08 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -286,6 +286,7 @@ struct pci_dev {
>> unsigned int irq;
>> struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
>>
>> + bool match_driver;
>> /* These fields are used by common fixups */
>> unsigned int transparent:1; /* Transparent PCI bridge */
>> unsigned int multifunction:1;/* Part of multi-function device */
>>
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