crypto: hisilicon/qm - obtain stop queue status

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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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:		Feb 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:		Feb 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

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:		Feb 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:		Feb 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

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:		Feb 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:		Feb 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

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,

drivers/crypto/hisilicon/qm.c

@@ -236,6 +236,12 @@
 
 #define QM_DEV_ALG_MAX_LEN		256
 
+ /* abnormal status value for stopping queue */
+#define QM_STOP_QUEUE_FAIL		1
+#define	QM_DUMP_SQC_FAIL		3
+#define	QM_DUMP_CQC_FAIL		4
+#define	QM_FINISH_WAIT			5
+
 #define QM_MK_CQC_DW3_V1(hop_num, pg_sz, buf_sz, cqe_sz) \
 	(((hop_num) << QM_CQ_HOP_NUM_SHIFT) | \
 	((pg_sz) << QM_CQ_PAGE_SIZE_SHIFT) | \
@@ -2037,43 +2043,25 @@ 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 = QM_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 = QM_DUMP_CQC_FAIL;
 			return ret;
 		}
 
@@ -2082,8 +2070,9 @@ 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 = QM_STOP_QUEUE_FAIL;
+			return -ETIMEDOUT;
 		}
 
 		usleep_range(WAIT_PERIOD_US_MIN, WAIT_PERIOD_US_MAX);
@@ -2092,6 +2081,49 @@ 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 = QM_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 +2351,31 @@ 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;
+
+	/*
+	 * After the queue fails to be stopped,
+	 * wait for a period of time before releasing the queue.
+	 */
+	while (++i) {
+		msleep(WAIT_PERIOD);
+
+		/* Since dev_timeout maybe modified, check i >= dev_timeout */
+		if (i >= dev_dfx->dev_timeout) {
+			dev_err(&qm->pdev->dev, "Stop q %u timeout, state %u\n",
+			       qp->qp_id, dev_dfx->dev_state);
+			dev_dfx->dev_state = QM_FINISH_WAIT;
+			break;
+		}
+	}
 }
 
 static int hisi_qm_is_q_updated(struct uacce_queue *q)

include/linux/hisi_acc_qm.h

@@ -163,6 +163,11 @@ struct qm_dev_alg {
 	const char *alg;
 };
 
+struct qm_dev_dfx {
+	u32 dev_state;
+	u32 dev_timeout;
+};
+
 struct dfx_diff_registers {
 	u32 *regs;
 	u32 reg_offset;
@@ -191,6 +196,7 @@ 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;