linux-kernel - Re: [PATCH v6 3/5] hisi_acc_vfio_pci: create subfunction for data reading

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Message-ID: <77e776eb-bc46-0a07-217c-e3bf385c7502@huawei.com>
Date: Tue, 7 May 2024 16:30:51 +0800
From: liulongfang <liulongfang@...wei.com>
To: Alex Williamson <alex.williamson@...hat.com>
CC: <jgg@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
	<jonathan.cameron@...wei.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>
Subject: Re: [PATCH v6 3/5] hisi_acc_vfio_pci: create subfunction for data
 reading

On 2024/5/4 0:25, Alex Williamson wrote:
> On Thu, 25 Apr 2024 21:23:20 +0800
> Longfang Liu <liulongfang@...wei.com> wrote:
> 
>> During the live migration process.
> 
> This is not a complete sentence.
> 
>> It needs to obtain various status
>> data of drivers and devices.
> 
> What's "It" describing here?
> 
>> In order to facilitate calling it in the
>> debugfs function.
> 
> Also not a complete sentence.
> 
>> For all operations that read data from device registers,
>> the driver creates a subfunction.
> 
> There's only one sub-function.
> 
>> Also fixed the location of address data.
> 
> I think this is addressed in the previous patch now?  Thanks,
> 

OK, I'll update the descriptions again.

> Alex
>

Thanks,
Longfang.

>> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
>> ---
>>  .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    | 54 +++++++++++--------
>>  1 file changed, 33 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
>> index 0c7e31076ff4..bf358ba94b5d 100644
>> --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
>> +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
>> @@ -486,31 +486,11 @@ static int vf_qm_load_data(struct hisi_acc_vf_core_device *hisi_acc_vdev,
>>  	return 0;
>>  }
>>  
>> -static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev,
>> -			    struct hisi_acc_vf_migration_file *migf)
>> +static int vf_qm_read_data(struct hisi_qm *vf_qm, struct acc_vf_data *vf_data)
>>  {
>> -	struct acc_vf_data *vf_data = &migf->vf_data;
>> -	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
>>  	struct device *dev = &vf_qm->pdev->dev;
>>  	int ret;
>>  
>> -	if (unlikely(qm_wait_dev_not_ready(vf_qm))) {
>> -		/* Update state and return with match data */
>> -		vf_data->vf_qm_state = QM_NOT_READY;
>> -		hisi_acc_vdev->vf_qm_state = vf_data->vf_qm_state;
>> -		migf->total_length = QM_MATCH_SIZE;
>> -		return 0;
>> -	}
>> -
>> -	vf_data->vf_qm_state = QM_READY;
>> -	hisi_acc_vdev->vf_qm_state = vf_data->vf_qm_state;
>> -
>> -	ret = vf_qm_cache_wb(vf_qm);
>> -	if (ret) {
>> -		dev_err(dev, "failed to writeback QM Cache!\n");
>> -		return ret;
>> -	}
>> -
>>  	ret = qm_get_regs(vf_qm, vf_data);
>>  	if (ret)
>>  		return -EINVAL;
>> @@ -536,6 +516,38 @@ static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev,
>>  		return -EINVAL;
>>  	}
>>  
>> +	return 0;
>> +}
>> +
>> +static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev,
>> +			    struct hisi_acc_vf_migration_file *migf)
>> +{
>> +	struct acc_vf_data *vf_data = &migf->vf_data;
>> +	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
>> +	struct device *dev = &vf_qm->pdev->dev;
>> +	int ret;
>> +
>> +	if (unlikely(qm_wait_dev_not_ready(vf_qm))) {
>> +		/* Update state and return with match data */
>> +		vf_data->vf_qm_state = QM_NOT_READY;
>> +		hisi_acc_vdev->vf_qm_state = vf_data->vf_qm_state;
>> +		migf->total_length = QM_MATCH_SIZE;
>> +		return 0;
>> +	}
>> +
>> +	vf_data->vf_qm_state = QM_READY;
>> +	hisi_acc_vdev->vf_qm_state = vf_data->vf_qm_state;
>> +
>> +	ret = vf_qm_cache_wb(vf_qm);
>> +	if (ret) {
>> +		dev_err(dev, "failed to writeback QM Cache!\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = vf_qm_read_data(vf_qm, vf_data);
>> +	if (ret)
>> +		return -EINVAL;
>> +
>>  	migf->total_length = sizeof(struct acc_vf_data);
>>  	return 0;
>>  }
> 
> .
>