Documentation: update debugfs doc for Hisilicon SEC

Update documentation describing DebugFS for function's QoS limiting.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/ABI/testing/debugfs-hisi-sec

@@ -14,6 +14,16 @@ Description:	One SEC controller has one PF and multiple VFs, each function
 		qm refers to.
 		Only available for PF.
 
+What:		/sys/kernel/debug/hisi_sec2/<bdf>/alg_qos
+Date:		Jun 2021
+Contact:	linux-crypto@vger.kernel.org
+Description:	The <bdf> is related the function for PF and VF.
+		SEC driver supports to configure each function's QoS, the driver
+		supports to write <bdf> value to alg_qos in the host. Such as
+		"echo <bdf> value > alg_qos". The qos value is 1~1000, means
+		1/1000~1000/1000 of total QoS. The driver reading alg_qos to
+		get related QoS in the host and VM, Such as "cat alg_qos".
+
 What:		/sys/kernel/debug/hisi_sec2/<bdf>/qm/qm_regs
 Date:		Oct 2019
 Contact:	linux-crypto@vger.kernel.org