[PATCH v5 08/27] PCI: add support for dev_groups to struct pci_device_driver

[Andrey Grodzovsky]

On 2021-04-28 12:53 p.m., Bjorn Helgaas wrote:
> In subject:
> 
> s/PCI: add support/PCI: Add support/
> 
> to match convention ("git log --oneline drivers/pci/pci-driver.c" to
> learn this).
> 
> On Wed, Apr 28, 2021 at 11:11:48AM -0400, Andrey Grodzovsky wrote:
>> This is exact copy of 'USB: add support for dev_groups to
>> struct usb_device_driver' patch by Greg but just for
>> the PCI case.
> 
> Ideally this would be an imperative sentence telling us what the patch
> *does*, not just that it's a copy of something else.
> 
> I'd also like a brief comment about why this is useful, i.e., why you
> need this and what you're going to use it for.
> 
> The usual commit citation format is 7d9c1d2f7aca ("USB: add support
> for dev_groups to struct usb_device_driver") so it's easier to locate
> the commit.
> 
> I see there is also b71b283e3d6d ("USB: add support for dev_groups to
> struct usb_driver").  I don't know enough about USB to know whether
> 7d9c1d2f7aca or b71b283e3d6d is a closer analogue to what you're doing
> here, but I do see that struct usb_driver is far more common than
> struct usb_device_driver.
> 
> PCI has struct pci_driver, but doesn't have the concept of a struct
> pci_device_driver.

Since we don't have pci_device_driver then pci_driver is the best place
for it then, no ?

Andrey

> 
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
>> Suggested-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
>> ---
>>   drivers/pci/pci-driver.c | 1 +
>>   include/linux/pci.h      | 3 +++
>>   2 files changed, 4 insertions(+)
>>
>> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
>> index ec44a79e951a..3a72352aa5cf 100644
>> --- a/drivers/pci/pci-driver.c
>> +++ b/drivers/pci/pci-driver.c
>> @@ -1385,6 +1385,7 @@ int __pci_register_driver(struct pci_driver *drv, struct module *owner,
>>   	drv->driver.owner = owner;
>>   	drv->driver.mod_name = mod_name;
>>   	drv->driver.groups = drv->groups;
>> +	drv->driver.dev_groups = drv->dev_groups;
>>   
>>   	spin_lock_init(&drv->dynids.lock);
>>   	INIT_LIST_HEAD(&drv->dynids.list);
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index 86c799c97b77..b57755b03009 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -858,6 +858,8 @@ struct module;
>>    *		number of VFs to enable via sysfs "sriov_numvfs" file.
>>    * @err_handler: See Documentation/PCI/pci-error-recovery.rst
>>    * @groups:	Sysfs attribute groups.
>> + * @dev_groups: Attributes attached to the device that will be
>> + *              created once it is bound to the driver.
>>    * @driver:	Driver model structure.
>>    * @dynids:	List of dynamically added device IDs.
>>    */
>> @@ -873,6 +875,7 @@ struct pci_driver {
>>   	int  (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */
>>   	const struct pci_error_handlers *err_handler;
>>   	const struct attribute_group **groups;
>> +	const struct attribute_group **dev_groups;
>>   	struct device_driver	driver;
>>   	struct pci_dynids	dynids;
>>   };
>> -- 
>> 2.25.1
>>