[PATCH 1/3] powerpc/pseries: Parse control memory access error

[PATCH 1/3] powerpc/pseries: Parse control memory access error

[Ganesh Goudar]

Add support to parse and log control memory access
error for pseries.

Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
---
 arch/powerpc/platforms/pseries/ras.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index 167f2e1b8d39..608c35cad0c3 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -80,6 +80,7 @@ struct pseries_mc_errorlog {
 #define MC_ERROR_TYPE_TLB		0x04
 #define MC_ERROR_TYPE_D_CACHE		0x05
 #define MC_ERROR_TYPE_I_CACHE		0x07
+#define MC_ERROR_TYPE_CTRL_MEM_ACCESS	0x08
 
 /* RTAS pseries MCE error sub types */
 #define MC_ERROR_UE_INDETERMINATE		0
@@ -103,6 +104,9 @@ struct pseries_mc_errorlog {
 #define MC_ERROR_TLB_MULTIHIT		2
 #define MC_ERROR_TLB_INDETERMINATE	3
 
+#define MC_ERROR_CTRL_MEM_ACCESS_PTABLE_WALK	0
+#define MC_ERROR_CTRL_MEM_ACCESS_OP_ACCESS	1
+
 static inline u8 rtas_mc_error_sub_type(const struct pseries_mc_errorlog *mlog)
 {
 	switch (mlog->error_type) {
@@ -112,6 +116,8 @@ static inline u8 rtas_mc_error_sub_type(const struct pseries_mc_errorlog *mlog)
 	case	MC_ERROR_TYPE_ERAT:
 	case	MC_ERROR_TYPE_TLB:
 		return (mlog->sub_err_type & 0x03);
+	case	MC_ERROR_TYPE_CTRL_MEM_ACCESS:
+		return (mlog->sub_err_type & 0x70) >> 4;
 	default:
 		return 0;
 	}
@@ -699,6 +705,21 @@ static int mce_handle_err_virtmode(struct pt_regs *regs,
 	case MC_ERROR_TYPE_I_CACHE:
 		mce_err.error_type = MCE_ERROR_TYPE_ICACHE;
 		break;
+	case MC_ERROR_TYPE_CTRL_MEM_ACCESS:
+		mce_err.error_type = MCE_ERROR_TYPE_RA;
+		if (mce_log->sub_err_type & 0x80)
+			eaddr = be64_to_cpu(mce_log->effective_address);
+		switch (err_sub_type) {
+		case MC_ERROR_CTRL_MEM_ACCESS_PTABLE_WALK:
+			mce_err.u.ra_error_type =
+				MCE_RA_ERROR_PAGE_TABLE_WALK_LOAD_STORE_FOREIGN;
+			break;
+		case MC_ERROR_CTRL_MEM_ACCESS_OP_ACCESS:
+			mce_err.u.ra_error_type =
+				MCE_RA_ERROR_LOAD_STORE_FOREIGN;
+			break;
+		}
+		break;
 	case MC_ERROR_TYPE_UNKNOWN:
 	default:
 		mce_err.error_type = MCE_ERROR_TYPE_UNKNOWN;
-- 
2.31.1

[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@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

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

[Michael Ellerman]

Ganesh Goudar <ganeshgr@linux.ibm.com> writes:
> 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>
> ---
>  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

This breaks the selftests build:

  https://github.com/ruscur/linux-ci/runs/3204665920?check_suite_focus=true

  make[2]: Entering directory '/linux/tools/testing/selftests/powerpc/mce'
  powerpc-linux-gnu-gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"77349a6"' -I/linux/tools/testing/selftests/powerpc/include     inject-ra-err.c  -o /output/kselftest/powerpc/mce/inject-ra-err
  Error: inject-ra-err.c:11:25: fatal error: asm/vas-api.h: No such file or directory

cheers

[PATCH 3/3] powerpc/mce: Modify the real address error logging messages

[Ganesh Goudar]

To avoid ambiguity, modify the strings in real address error
logging messages to "foreign/control memory" from "foreign",
Since the error discriptions in P9 user manual and P10 user
manual are different for same type of errors.

P9 User Manual for MCE:
DSISR:59 Host real address to foreign space during translation.
DSISR:60 Host real address to foreign space on a load or store
	 access.

P10 User Manual for MCE:
DSISR:59 D-side tablewalk used a host real address in the
	 control memory address range.
DSISR:60 D-side operand access to control memory address space.

Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
---
 arch/powerpc/kernel/mce.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
index 47a683cd00d2..f3ef480bb739 100644
--- a/arch/powerpc/kernel/mce.c
+++ b/arch/powerpc/kernel/mce.c
@@ -388,14 +388,14 @@ void machine_check_print_event_info(struct machine_check_event *evt,
 	static const char *mc_ra_types[] = {
 		"Indeterminate",
 		"Instruction fetch (bad)",
-		"Instruction fetch (foreign)",
+		"Instruction fetch (foreign/control memory)",
 		"Page table walk ifetch (bad)",
-		"Page table walk ifetch (foreign)",
+		"Page table walk ifetch (foreign/control memory)",
 		"Load (bad)",
 		"Store (bad)",
 		"Page table walk Load/Store (bad)",
-		"Page table walk Load/Store (foreign)",
-		"Load/Store (foreign)",
+		"Page table walk Load/Store (foreign/control memory)",
+		"Load/Store (foreign/control memory)",
 	};
 	static const char *mc_link_types[] = {
 		"Indeterminate",
-- 
2.31.1