Received-SPF: pass (google.com: domain of linux-crypto+bounces-1725-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Subject: Re: [PATCH 2/3] crypto: hisilicon/qm - obtain stop queue status
To: Weili Qian <qianweili@huawei.com>, <herbert@gondor.apana.org.au>
CC: <linux-crypto@vger.kernel.org>, <linux-kernel@vger.kernel.org>
References: <20240127131530.64617-1-qianweili@huawei.com>
 <20240127131530.64617-3-qianweili@huawei.com>
From: liulongfang <liulongfang@huawei.com>
Message-ID: <3d2359ad-e3c3-5e77-ae77-c824b1ef9f9a@huawei.com>
Date: Mon, 29 Jan 2024 10:40:34 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.8.0
Precedence: bulk
MIME-Version: 1.0
In-Reply-To: <20240127131530.64617-3-qianweili@huawei.com>
Content-Type: text/plain; charset="gbk"
Content-Transfer-Encoding: 7bit

On 2024/1/27 21:15, Weili Qian wrote:
> The debugfs files 'dev_state' and 'dev_timeout' are added.
> Users can query the current queue stop status through these two
> files. And set the waiting timeout when the queue is released.
> 
> dev_state: if dev_timeout is set, dev_state indicates the status
> of stopping the queue. 0 indicates that the queue is stopped
> successfully. Other values indicate that the queue stops fail.
> if dev_timeout is not set, the value of dev_state is 0;
> 
> dev_timeout: If the queue fails to stop, the queue is released
> after waiting dev_timeout * 20ms.
> 
> Signed-off-by: Weili Qian <qianweili@huawei.com>
> ---
>  Documentation/ABI/testing/debugfs-hisi-hpre | 15 ++++
>  Documentation/ABI/testing/debugfs-hisi-sec  | 15 ++++
>  Documentation/ABI/testing/debugfs-hisi-zip  | 15 ++++
>  drivers/crypto/hisilicon/debugfs.c          |  5 ++
>  drivers/crypto/hisilicon/qm.c               | 97 +++++++++++++++------
>  include/linux/hisi_acc_qm.h                 | 14 +++
>  6 files changed, 135 insertions(+), 26 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/debugfs-hisi-hpre b/Documentation/ABI/testing/debugfs-hisi-hpre
> index 6ed9258605c7..e6394a2fb371 100644
> --- a/Documentation/ABI/testing/debugfs-hisi-hpre
> +++ b/Documentation/ABI/testing/debugfs-hisi-hpre
> @@ -118,6 +118,21 @@ Description:	Dump the state of the device.
>  		0: busy, 1: idle.
>  		Only available for PF, and take no other effect on HPRE.
>  
> +What:		/sys/kernel/debug/hisi_hpre/<bdf>/qm/dev_timeout
> +Date:		Jan 2024
> +Contact:	linux-crypto@vger.kernel.org
> +Description:	Set the wait time when stop queue fails. Available for both PF
> +		and VF, and take no other effect on HPRE.
> +		0: not wait(default), others value: wait dev_timeout * 20 microsecond.
> +
> +What:		/sys/kernel/debug/hisi_hpre/<bdf>/qm/dev_state
> +Date:		Jan 2024
> +Contact:	linux-crypto@vger.kernel.org
> +Description:	Dump the stop queue status of the QM. The default value is 0,
> +		if dev_timeout is set, when stop queue fails, the dev_state
> +		will return non-zero value. Available for both PF and VF,
> +		and take no other effect on HPRE.
> +
>  What:		/sys/kernel/debug/hisi_hpre/<bdf>/hpre_dfx/diff_regs
>  Date:		Mar 2022
>  Contact:	linux-crypto@vger.kernel.org
> diff --git a/Documentation/ABI/testing/debugfs-hisi-sec b/Documentation/ABI/testing/debugfs-hisi-sec
> index 403f5de96318..2b5db193b5e6 100644
> --- a/Documentation/ABI/testing/debugfs-hisi-sec
> +++ b/Documentation/ABI/testing/debugfs-hisi-sec
> @@ -98,6 +98,21 @@ Description:	Dump the state of the device.
>  		0: busy, 1: idle.
>  		Only available for PF, and take no other effect on SEC.
>  
> +What:		/sys/kernel/debug/hisi_sec2/<bdf>/qm/dev_timeout
> +Date:		Jan 2024
> +Contact:	linux-crypto@vger.kernel.org
> +Description:	Set the wait time when stop queue fails. Available for both PF
> +		and VF, and take no other effect on SEC.
> +		0: not wait(default), others value: wait dev_timeout * 20 microsecond.
> +
> +What:		/sys/kernel/debug/hisi_sec2/<bdf>/qm/dev_state
> +Date:		Jan 2024
> +Contact:	linux-crypto@vger.kernel.org
> +Description:	Dump the stop queue status of the QM. The default value is 0,
> +		if dev_timeout is set, when stop queue fails, the dev_state
> +		will return non-zero value. Available for both PF and VF,
> +		and take no other effect on SEC.
> +
>  What:		/sys/kernel/debug/hisi_sec2/<bdf>/sec_dfx/diff_regs
>  Date:		Mar 2022
>  Contact:	linux-crypto@vger.kernel.org
> diff --git a/Documentation/ABI/testing/debugfs-hisi-zip b/Documentation/ABI/testing/debugfs-hisi-zip
> index 2394e6a3cfe2..260c514e0e9e 100644
> --- a/Documentation/ABI/testing/debugfs-hisi-zip
> +++ b/Documentation/ABI/testing/debugfs-hisi-zip
> @@ -111,6 +111,21 @@ Description:	Dump the state of the device.
>  		0: busy, 1: idle.
>  		Only available for PF, and take no other effect on ZIP.
>  
> +What:		/sys/kernel/debug/hisi_zip/<bdf>/qm/dev_timeout
> +Date:		Jan 2024
> +Contact:	linux-crypto@vger.kernel.org
> +Description:	Set the wait time when stop queue fails. Available for both PF
> +		and VF, and take no other effect on ZIP.
> +		0: not wait(default), others value: wait dev_timeout * 20 microsecond.
> +
> +What:		/sys/kernel/debug/hisi_zip/<bdf>/qm/dev_state
> +Date:		Jan 2024
> +Contact:	linux-crypto@vger.kernel.org
> +Description:	Dump the stop queue status of the QM. The default value is 0,
> +		if dev_timeout is set, when stop queue fails, the dev_state
> +		will return non-zero value. Available for both PF and VF,
> +		and take no other effect on ZIP.
> +
>  What:		/sys/kernel/debug/hisi_zip/<bdf>/zip_dfx/diff_regs
>  Date:		Mar 2022
>  Contact:	linux-crypto@vger.kernel.org
> diff --git a/drivers/crypto/hisilicon/debugfs.c b/drivers/crypto/hisilicon/debugfs.c
> index 06e67eda409f..cd67fa348ca7 100644
> --- a/drivers/crypto/hisilicon/debugfs.c
> +++ b/drivers/crypto/hisilicon/debugfs.c
> @@ -1112,6 +1112,7 @@ DEFINE_DEBUGFS_ATTRIBUTE(qm_atomic64_ops, qm_debugfs_atomic64_get,
>  void hisi_qm_debug_init(struct hisi_qm *qm)
>  {
>  	struct dfx_diff_registers *qm_regs = qm->debug.qm_diff_regs;
> +	struct qm_dev_dfx *dev_dfx = &qm->debug.dev_dfx;
>  	struct qm_dfx *dfx = &qm->debug.dfx;
>  	struct dentry *qm_d;
>  	void *data;
> @@ -1140,6 +1141,10 @@ void hisi_qm_debug_init(struct hisi_qm *qm)
>  
>  	debugfs_create_file("status", 0444, qm->debug.qm_d, qm,
>  			&qm_status_fops);
> +
> +	debugfs_create_u32("dev_state", 0444, qm->debug.qm_d, &dev_dfx->dev_state);
> +	debugfs_create_u32("dev_timeout", 0644, qm->debug.qm_d, &dev_dfx->dev_timeout);
> +
>  	for (i = 0; i < ARRAY_SIZE(qm_dfx_files); i++) {
>  		data = (atomic64_t *)((uintptr_t)dfx + qm_dfx_files[i].offset);
>  		debugfs_create_file(qm_dfx_files[i].name,
> diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
> index 3b015482b4e6..75d0b2ea117e 100644
> --- a/drivers/crypto/hisilicon/qm.c
> +++ b/drivers/crypto/hisilicon/qm.c
> @@ -2037,43 +2037,25 @@ static void qp_stop_fail_cb(struct hisi_qp *qp)
>  	}
>  }
>  
> -/**
> - * qm_drain_qp() - Drain a qp.
> - * @qp: The qp we want to drain.
> - *
> - * Determine whether the queue is cleared by judging the tail pointers of
> - * sq and cq.
> - */
> -static int qm_drain_qp(struct hisi_qp *qp)
> +static int qm_wait_qp_empty(struct hisi_qm *qm, u32 *state, u32 qp_id)
>  {
> -	struct hisi_qm *qm = qp->qm;
>  	struct device *dev = &qm->pdev->dev;
>  	struct qm_sqc sqc;
>  	struct qm_cqc cqc;
>  	int ret, i = 0;
>  
> -	/* No need to judge if master OOO is blocked. */
> -	if (qm_check_dev_error(qm))
> -		return 0;
> -
> -	/* Kunpeng930 supports drain qp by device */
> -	if (test_bit(QM_SUPPORT_STOP_QP, &qm->caps)) {
> -		ret = qm_stop_qp(qp);
> -		if (ret)
> -			dev_err(dev, "Failed to stop qp(%u)!\n", qp->qp_id);
> -		return ret;
> -	}
> -
>  	while (++i) {
> -		ret = qm_set_and_get_xqc(qm, QM_MB_CMD_SQC, &sqc, qp->qp_id, 1);
> +		ret = qm_set_and_get_xqc(qm, QM_MB_CMD_SQC, &sqc, qp_id, 1);
>  		if (ret) {
>  			dev_err_ratelimited(dev, "Failed to dump sqc!\n");
> +			*state = DUMP_SQC_FAIL;
>  			return ret;
>  		}
>  
> -		ret = qm_set_and_get_xqc(qm, QM_MB_CMD_CQC, &cqc, qp->qp_id, 1);
> +		ret = qm_set_and_get_xqc(qm, QM_MB_CMD_CQC, &cqc, qp_id, 1);
>  		if (ret) {
>  			dev_err_ratelimited(dev, "Failed to dump cqc!\n");
> +			*state = DUMP_CQC_FAIL;
>  			return ret;
>  		}
>  
> @@ -2082,8 +2064,9 @@ static int qm_drain_qp(struct hisi_qp *qp)
>  			break;
>  
>  		if (i == MAX_WAIT_COUNTS) {
> -			dev_err(dev, "Fail to empty queue %u!\n", qp->qp_id);
> -			return -EBUSY;
> +			dev_err(dev, "Fail to empty queue %u!\n", qp_id);
> +			*state = STOP_QUEUE_FAIL;
> +			return -ETIMEDOUT;
>  		}
>  
>  		usleep_range(WAIT_PERIOD_US_MIN, WAIT_PERIOD_US_MAX);
> @@ -2092,6 +2075,49 @@ static int qm_drain_qp(struct hisi_qp *qp)
>  	return 0;
>  }
>  
> +/**
> + * qm_drain_qp() - Drain a qp.
> + * @qp: The qp we want to drain.
> + *
> + * If the device does not support stopping queue by sending mailbox,
> + * determine whether the queue is cleared by judging the tail pointers of
> + * sq and cq.
> + */
> +static int qm_drain_qp(struct hisi_qp *qp)
> +{
> +	struct hisi_qm *qm = qp->qm;
> +	struct hisi_qm *pf_qm = pci_get_drvdata(pci_physfn(qm->pdev));
> +	u32 state = 0;
> +	int ret;
> +
> +	/* No need to judge if master OOO is blocked. */
> +	if (qm_check_dev_error(pf_qm))
> +		return 0;
> +
> +	/* HW V3 supports drain qp by device */
> +	if (test_bit(QM_SUPPORT_STOP_QP, &qm->caps)) {
> +		ret = qm_stop_qp(qp);
> +		if (ret) {
> +			dev_err(&qm->pdev->dev, "Failed to stop qp!\n");
> +			state = STOP_QUEUE_FAIL;
> +			goto set_dev_state;
> +		}
> +		return ret;
> +	}
> +
> +	ret = qm_wait_qp_empty(qm, &state, qp->qp_id);
> +	if (ret)
> +		goto set_dev_state;
> +
> +	return 0;
> +
> +set_dev_state:
> +	if (qm->debug.dev_dfx.dev_timeout)
> +		qm->debug.dev_dfx.dev_state = state;
> +
> +	return ret;
> +}
> +
>  static int qm_stop_qp_nolock(struct hisi_qp *qp)
>  {
>  	struct hisi_qm *qm = qp->qm;
> @@ -2319,7 +2345,26 @@ static int hisi_qm_uacce_start_queue(struct uacce_queue *q)
>  
>  static void hisi_qm_uacce_stop_queue(struct uacce_queue *q)
>  {
> -	hisi_qm_stop_qp(q->priv);
> +	struct hisi_qp *qp = q->priv;
> +	struct hisi_qm *qm = qp->qm;
> +	struct qm_dev_dfx *dev_dfx = &qm->debug.dev_dfx;
> +	u32 i = 0;
> +
> +	hisi_qm_stop_qp(qp);
> +
> +	if (!dev_dfx->dev_timeout || !dev_dfx->dev_state)
> +		return;
> +
> +	while (++i) {
> +		if (!i || i > dev_dfx->dev_timeout) {


The "!i" judgment here is redundant. What needs to be considered is the situation
if i is equal to dev_timeout and both are UINT_MAX.

Thanks,
Longfang.

> +			dev_err(&qm->pdev->dev, "Stop q %u timeout, state %u\n",
> +			       qp->qp_id, dev_dfx->dev_state);
> +			dev_dfx->dev_state = FINISH_WAIT;
> +			break;
> +		}
> +
> +		msleep(WAIT_PERIOD);
> +	}
>  }
>  
>  static int hisi_qm_is_q_updated(struct uacce_queue *q)
> diff --git a/include/linux/hisi_acc_qm.h b/include/linux/hisi_acc_qm.h
> index 720f10874a66..ec5a70ade511 100644
> --- a/include/linux/hisi_acc_qm.h
> +++ b/include/linux/hisi_acc_qm.h
> @@ -158,6 +158,19 @@ enum qm_cap_bits {
>  	QM_SUPPORT_RPM,
>  };
>  
> +enum qm_dev_fail_state {
> +	STOP_QUEUE_FAIL = 1,
> +	ALLOC_CTX_FAIL,
> +	DUMP_SQC_FAIL,
> +	DUMP_CQC_FAIL,
> +	FINISH_WAIT,
> +};
> +
> +struct qm_dev_dfx {
> +	u32 dev_state;
> +	u32 dev_timeout;
> +};
> +
>  struct qm_dev_alg {
>  	u64 alg_msk;
>  	const char *alg;
> @@ -191,6 +204,7 @@ struct qm_debug {
>  	struct dentry *debug_root;
>  	struct dentry *qm_d;
>  	struct debugfs_file files[DEBUG_FILE_NUM];
> +	struct qm_dev_dfx dev_dfx;
>  	unsigned int *qm_last_words;
>  	/* ACC engines recoreding last regs */
>  	unsigned int *last_words;
>