linux-kernel - RE: [PATCH v7 2/4] hisi_acc_vfio_pci: create subfunction for data reading

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Message-ID: <f096a1cd4f3b4f3681b4eebd9e61fbdb@huawei.com>
Date: Mon, 5 Aug 2024 09:12:47 +0000
From: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To: liulongfang <liulongfang@...wei.com>, "alex.williamson@...hat.com"
	<alex.williamson@...hat.com>, "jgg@...dia.com" <jgg@...dia.com>, "Jonathan
 Cameron" <jonathan.cameron@...wei.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxarm@...neuler.org" <linuxarm@...neuler.org>
Subject: RE: [PATCH v7 2/4] hisi_acc_vfio_pci: create subfunction for data
 reading



> -----Original Message-----
> From: liulongfang <liulongfang@...wei.com>
> Sent: Tuesday, July 30, 2024 1:15 PM
> To: alex.williamson@...hat.com; jgg@...dia.com; Shameerali Kolothum
> Thodi <shameerali.kolothum.thodi@...wei.com>; Jonathan Cameron
> <jonathan.cameron@...wei.com>
> Cc: kvm@...r.kernel.org; linux-kernel@...r.kernel.org;
> linuxarm@...neuler.org; liulongfang <liulongfang@...wei.com>
> Subject: [PATCH v7 2/4] hisi_acc_vfio_pci: create subfunction for data
> reading
> 
> This patch generates the code for the operation of reading data from
> the device into a sub-function.
> Then, it can be called during the device status data saving phase of
> the live migration process and the device status data reading function
> in debugfs.
> Thereby reducing the redundant code of the driver.
> 
> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
> ---


LGTM,

Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>

Thanks,
Shameer

>  .../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 45351be8e270..a8c53952d82e 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;
>  }
> --
> 2.24.0