[PATCH 2/3] selftests/powerpc: Add test for real address error handling

[Ganesh Goudar]

Add test for real address or control memory address access
error handling, using NX-GZIP engine.

The error is injected by accessing the control memory address
using illegal instruction, on successful handling the process
attempting to access control memory address using illegal
instruction receives SIGBUS.

Signed-off-by: Ganesh Goudar <ganeshgr at linux.ibm.com>
---
 tools/testing/selftests/powerpc/Makefile      |  3 +-
 tools/testing/selftests/powerpc/mce/Makefile  |  6 +++
 .../selftests/powerpc/mce/inject-ra-err.c     | 42 +++++++++++++++++++
 .../selftests/powerpc/mce/inject-ra-err.sh    | 19 +++++++++
 4 files changed, 69 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/mce/Makefile
 create mode 100644 tools/testing/selftests/powerpc/mce/inject-ra-err.c
 create mode 100755 tools/testing/selftests/powerpc/mce/inject-ra-err.sh

diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index 0830e63818c1..4830372d7416 100644
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile
@@ -31,7 +31,8 @@ SUB_DIRS = alignment		\
 	   vphn         \
 	   math		\
 	   ptrace	\
-	   security
+	   security	\
+	   mce
 
 endif
 
diff --git a/tools/testing/selftests/powerpc/mce/Makefile b/tools/testing/selftests/powerpc/mce/Makefile
new file mode 100644
index 000000000000..0f537ce86370
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/Makefile
@@ -0,0 +1,6 @@
+#SPDX-License-Identifier: GPL-2.0-or-later
+
+TEST_PROGS := inject-ra-err.sh
+TEST_GEN_FILES := inject-ra-err
+
+include ../../lib.mk
diff --git a/tools/testing/selftests/powerpc/mce/inject-ra-err.c b/tools/testing/selftests/powerpc/mce/inject-ra-err.c
new file mode 100644
index 000000000000..58374bc92e90
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/inject-ra-err.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <asm/vas-api.h>
+
+int main(void)
+{
+	int fd, ret;
+	int *paste_addr;
+	struct vas_tx_win_open_attr attr;
+	char *devname = "/dev/crypto/nx-gzip";
+
+	memset(&attr, 0, sizeof(attr));
+	attr.version = 1;
+	attr.vas_id = 0;
+
+	fd = open(devname, O_RDWR);
+	if (fd < 0) {
+		fprintf(stderr, "Failed to open device %s\n", devname);
+		return -errno;
+	}
+	ret = ioctl(fd, VAS_TX_WIN_OPEN, &attr);
+	if (ret < 0) {
+		fprintf(stderr, "ioctl() n %d, error %d\n", ret, errno);
+		ret = -errno;
+		goto out;
+	}
+	paste_addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0ULL);
+	/* The following assignment triggers exception */
+	*paste_addr = 1;
+	ret = 0;
+out:
+	close(fd);
+	return ret;
+}
diff --git a/tools/testing/selftests/powerpc/mce/inject-ra-err.sh b/tools/testing/selftests/powerpc/mce/inject-ra-err.sh
new file mode 100755
index 000000000000..0e9c8ae6ad78
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/inject-ra-err.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+if [[ ! -w /dev/crypto/nx-gzip ]]; then
+	echo "WARN: Can't access /dev/crypto/nx-gzip, skipping"
+	exit 0
+fi
+
+# Timeout in 5 seconds, If not handled it may run indefinitely.
+timeout 5 ./inject-ra-err
+
+# 128 + 7 (SIGBUS) = 135, 128 is a exit Code With Special Meaning.
+if [ $? -ne 135 ]; then
+	echo "FAILED: Control memory access error not handled"
+	exit $?
+fi
+
+echo "OK: Control memory access error is handled"
+exit 0
-- 
2.31.1