linux-kernel - Re: [PATCH] PCI: endpoint: Create configfs entry for each pci_epf_device

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Date:   Fri, 18 May 2018 20:19:20 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: endpoint: Create configfs entry for each
 pci_epf_device_id table entry

Hi Lorenzo,

On Friday 18 May 2018 07:52 PM, Lorenzo Pieralisi wrote:
> Hi Kishon, Gustavo,
> 
> On Mon, Apr 02, 2018 at 06:59:35PM +0530, Kishon Vijay Abraham I wrote:
>> In order to be able to provide correct driver_data for pci_epf device,
>> a separate configfs entry for each pci_epf_device_id table entry in
>> pci_epf_driver is required.
>>
>> Add support to create configfs entry for each pci_epf_device_id
>> table entry here.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  drivers/pci/endpoint/pci-epf-core.c | 23 +++++++++++++++++++++--
>>  include/linux/pci-epf.h             |  4 ++--
>>  2 files changed, 23 insertions(+), 4 deletions(-)
> 
> Do we still need this patch after the recent discussion on the configfs
> interface ?

Yeah, Since we allow multiple pci_epf_device_id entries to be created, I think
this patch is still valid.

If someone wants to create a new pci_epf_device_id entry (maybe for configuring
the driver in a different way), this would be still required.

Thanks
Kishon
> 
> https://patchwork.ozlabs.org/patch/903494/
> 
> Lorenzo
> 
>> diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
>> index 59ed29e550e9..d6787f39fd41 100644
>> --- a/drivers/pci/endpoint/pci-epf-core.c
>> +++ b/drivers/pci/endpoint/pci-epf-core.c
>> @@ -15,6 +15,8 @@
>>  #include <linux/pci-epf.h>
>>  #include <linux/pci-ep-cfs.h>
>>  
>> +static DEFINE_MUTEX(pci_epf_mutex);
>> +
>>  static struct bus_type pci_epf_bus_type;
>>  static const struct device_type pci_epf_type;
>>  
>> @@ -139,7 +141,13 @@ EXPORT_SYMBOL_GPL(pci_epf_alloc_space);
>>   */
>>  void pci_epf_unregister_driver(struct pci_epf_driver *driver)
>>  {
>> -	pci_ep_cfs_remove_epf_group(driver->group);
>> +	struct config_group *group;
>> +
>> +	mutex_lock(&pci_epf_mutex);
>> +	list_for_each_entry(group, &driver->epf_group, group_entry)
>> +		pci_ep_cfs_remove_epf_group(group);
>> +	list_del(&driver->epf_group);
>> +	mutex_unlock(&pci_epf_mutex);
>>  	driver_unregister(&driver->driver);
>>  }
>>  EXPORT_SYMBOL_GPL(pci_epf_unregister_driver);
>> @@ -155,6 +163,8 @@ int __pci_epf_register_driver(struct pci_epf_driver *driver,
>>  			      struct module *owner)
>>  {
>>  	int ret;
>> +	struct config_group *group;
>> +	const struct pci_epf_device_id *id;
>>  
>>  	if (!driver->ops)
>>  		return -EINVAL;
>> @@ -169,7 +179,16 @@ int __pci_epf_register_driver(struct pci_epf_driver *driver,
>>  	if (ret)
>>  		return ret;
>>  
>> -	driver->group = pci_ep_cfs_add_epf_group(driver->driver.name);
>> +	INIT_LIST_HEAD(&driver->epf_group);
>> +
>> +	id = driver->id_table;
>> +	while (id->name[0]) {
>> +		group = pci_ep_cfs_add_epf_group(id->name);
>> +		mutex_lock(&pci_epf_mutex);
>> +		list_add_tail(&group->group_entry, &driver->epf_group);
>> +		mutex_unlock(&pci_epf_mutex);
>> +		id++;
>> +	}
>>  
>>  	return 0;
>>  }
>> diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
>> index e897bf076701..a30dcaafa6e8 100644
>> --- a/include/linux/pci-epf.h
>> +++ b/include/linux/pci-epf.h
>> @@ -72,7 +72,7 @@ struct pci_epf_ops {
>>   * @driver: PCI EPF driver
>>   * @ops: set of function pointers for performing EPF operations
>>   * @owner: the owner of the module that registers the PCI EPF driver
>> - * @group: configfs group corresponding to the PCI EPF driver
>> + * @epf_group: list of configfs group corresponding to the PCI EPF driver
>>   * @id_table: identifies EPF devices for probing
>>   */
>>  struct pci_epf_driver {
>> @@ -82,7 +82,7 @@ struct pci_epf_driver {
>>  	struct device_driver	driver;
>>  	struct pci_epf_ops	*ops;
>>  	struct module		*owner;
>> -	struct config_group	*group;
>> +	struct list_head	epf_group;
>>  	const struct pci_epf_device_id	*id_table;
>>  };
>>  
>> -- 
>> 2.16.2
>>