linux-kernel - Re: [PATCH v4 1/5] vfio/migration: Add debugfs to live migration driver

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Date:   Mon, 5 Dec 2022 21:39:29 +0800
From:   liulongfang <liulongfang@...wei.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     <alex.williamson@...hat.com>,
        <shameerali.kolothum.thodi@...wei.com>, <john.garry@...wei.com>,
        <cohuck@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>
Subject: Re: [PATCH v4 1/5] vfio/migration: Add debugfs to live migration
 driver

On 2022/12/2 23:17, Jason Gunthorpe wrote:
> On Fri, Dec 02, 2022 at 05:26:21PM +0800, Longfang Liu wrote:
> 
>> +static ssize_t vfio_pci_vf_state_read(struct file *filp, char __user *buffer,
>> +			   size_t count, loff_t *pos)
>> +{
> 
> This would be better to use debugfs_create_devm_seqfile()
> 
> Then you can simply use seq_printf()
>

The previous debugfs used this method in my patch.
Is it now recommended to use the interface with "devm" ?


>> @@ -119,6 +129,8 @@ struct vfio_migration_ops {
>>  				   enum vfio_device_mig_state *curr_state);
>>  	int (*migration_get_data_size)(struct vfio_device *device,
>>  				       unsigned long *stop_copy_length);
>> +	int (*migration_get_data)(struct vfio_device *device, char *buffer);
>> +	int (*migration_get_attr)(struct vfio_device *device, char
>>  				   *buffer);
> 
> Still no to passing through debugfs ops, create these files in the
> driver.
> 

If this part is also created and enabled in the device driver, why do we need
to put this debugfs in the vfio public framework?

Thanks,
Longfang.
> Jason
> .
>