[PATCH v2 2/3] selftests/powerpc: Add test for real address error handling

[Ganesh Goudar <ganeshgr@linux.ibm.com>]

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@linux.ibm.com>
---
v2: Fix build error.
---
 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    | 18 ++++++++
 tools/testing/selftests/powerpc/mce/vas-api.h |  1 +
 5 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
 create mode 120000 tools/testing/selftests/powerpc/mce/vas-api.h

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..05ab11cec3da
--- /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 "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..3633cdc651a1
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/inject-ra-err.sh
@@ -0,0 +1,18 @@
+#!/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 5 ./inject-ra-err
+
+# 128 + 7 (SIGBUS) = 135, 128 is a exit code with special meaning.
+if [ $? -ne 135 ]; then
+	echo "FAILED: Real address or Control memory access error not handled"
+	exit $?
+fi
+
+echo "OK: Real address or Control memory access error is handled"
+exit 0
diff --git a/tools/testing/selftests/powerpc/mce/vas-api.h b/tools/testing/selftests/powerpc/mce/vas-api.h
new file mode 120000
index 000000000000..1455c1bcd351
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/vas-api.h
@@ -0,0 +1 @@
+../../../../../arch/powerpc/include/uapi/asm/vas-api.h
\ No newline at end of file
-- 
2.31.1