linux-kernel - Re: [PATCH v8 7/9] crypto: hisilicon/qm: Set the VF QM state register

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Date:   Fri, 4 Mar 2022 17:43:03 +0800
From:   Zhou Wang <wangzhou1@...ilicon.com>
To:     Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>
CC:     <linux-pci@...r.kernel.org>, <alex.williamson@...hat.com>,
        <jgg@...dia.com>, <cohuck@...hat.com>, <mgurtovoy@...dia.com>,
        <yishaih@...dia.com>, <linuxarm@...wei.com>,
        <liulongfang@...wei.com>, <prime.zeng@...ilicon.com>,
        <jonathan.cameron@...wei.com>
Subject: Re: [PATCH v8 7/9] crypto: hisilicon/qm: Set the VF QM state register

> From: Longfang Liu <liulongfang@...wei.com>>
> We use VF QM state register to record the status of the QM configuration
> state. This will be used in the ACC migration driver to determine whether
> we can safely save and restore the QM data.
> 
> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>

Acked-by: Zhou Wang <wangzhou1@...ilicon.com>

Best,
Zhou

> ---
>  drivers/crypto/hisilicon/qm.c | 8 ++++++++
>  include/linux/hisi_acc_qm.h   | 6 ++++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
> index c88e013371af..6a8776db38b5 100644
> --- a/drivers/crypto/hisilicon/qm.c
> +++ b/drivers/crypto/hisilicon/qm.c
> @@ -3492,6 +3492,12 @@ static void hisi_qm_pci_uninit(struct hisi_qm *qm)
>  	pci_disable_device(pdev);
>  }
>  
> +static void hisi_qm_set_state(struct hisi_qm *qm, u8 state)
> +{
> +	if (qm->ver > QM_HW_V2 && qm->fun_type == QM_HW_VF)
> +		writel(state, qm->io_base + QM_VF_STATE);
> +}
> +
>  /**
>   * hisi_qm_uninit() - Uninitialize qm.
>   * @qm: The qm needed uninit.
> @@ -3520,6 +3526,7 @@ void hisi_qm_uninit(struct hisi_qm *qm)
>  		dma_free_coherent(dev, qm->qdma.size,
>  				  qm->qdma.va, qm->qdma.dma);
>  	}
> +	hisi_qm_set_state(qm, QM_NOT_READY);
>  	up_write(&qm->qps_lock);
>  
>  	qm_irq_unregister(qm);
> @@ -3745,6 +3752,7 @@ int hisi_qm_start(struct hisi_qm *qm)
>  	if (!ret)
>  		atomic_set(&qm->status.flags, QM_START);
>  
> +	hisi_qm_set_state(qm, QM_READY);
>  err_unlock:
>  	up_write(&qm->qps_lock);
>  	return ret;
> diff --git a/include/linux/hisi_acc_qm.h b/include/linux/hisi_acc_qm.h
> index 00f2a4db8723..177f7b7cd414 100644
> --- a/include/linux/hisi_acc_qm.h
> +++ b/include/linux/hisi_acc_qm.h
> @@ -67,6 +67,7 @@
>  #define QM_DB_RAND_SHIFT_V2		16
>  #define QM_DB_INDEX_SHIFT_V2		32
>  #define QM_DB_PRIORITY_SHIFT_V2		48
> +#define QM_VF_STATE			0x60
>  
>  /* qm cache */
>  #define QM_CACHE_CTL			0x100050
> @@ -162,6 +163,11 @@ enum qm_debug_file {
>  	DEBUG_FILE_NUM,
>  };
>  
> +enum qm_vf_state {
> +	QM_READY = 0,
> +	QM_NOT_READY,
> +};
> +
>  struct qm_dfx {
>  	atomic64_t err_irq_cnt;
>  	atomic64_t aeq_irq_cnt;
>