From a520f5ca580fcff34fd0d9f0d64a4c165f57eb30 Mon Sep 17 00:00:00 2001
From: Mitchell Horne <mhorne@FreeBSD.org>
Date: Mon, 18 Jan 2021 16:59:21 -0400
Subject: [PATCH] armv8crypto: print a message on probe failure

Similar to the message printed by aesni(4), let the user know if the
driver is unsupported by their CPU.

PR:		252543
Reported by:	gbe
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
---
 sys/crypto/armv8/armv8_crypto.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/crypto/armv8/armv8_crypto.c b/sys/crypto/armv8/armv8_crypto.c
index 90d096b53b1..f296337e6f3 100644
--- a/sys/crypto/armv8/armv8_crypto.c
+++ b/sys/crypto/armv8/armv8_crypto.c
@@ -112,6 +112,9 @@ armv8_crypto_probe(device_t dev)
 	case ID_AA64ISAR0_AES_PMULL:
 		ret = 0;
 		break;
+	case ID_AA64ISAR0_AES_NONE:
+		device_printf(dev, "CPU lacks AES instructions");
+		break;
 	}
 
 	device_set_desc_copy(dev, "AES-CBC,AES-XTS");