@@ -33,6 +33,7 @@ SUB_DIRS = alignment \
math \
papr_attributes \
papr_vpd \
+ papr_sysparm \
ptrace \
security \
mce
new file mode 100644
@@ -0,0 +1 @@
+/papr_sysparm
new file mode 100644
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+noarg:
+ $(MAKE) -C ../
+
+TEST_GEN_PROGS := papr_sysparm
+
+top_srcdir = ../../../../..
+include ../../lib.mk
+
+$(TEST_GEN_PROGS): ../harness.c ../utils.c
+
+$(OUTPUT)/papr_sysparm: CFLAGS += $(KHDR_INCLUDES)
new file mode 100644
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <asm/papr-sysparm.h>
+
+#include "utils.h"
+
+#define DEVPATH "/dev/papr-sysparm"
+
+static int open_close(void)
+{
+ const int devfd = open(DEVPATH, O_RDONLY);
+
+ SKIP_IF_MSG(devfd < 0 && errno == ENOENT,
+ DEVPATH " not present");
+
+ FAIL_IF(devfd < 0);
+ FAIL_IF(close(devfd) != 0);
+
+ return 0;
+}
+
+static int get_splpar(void)
+{
+ struct papr_sysparm_io_block sp = {
+ .parameter = 20, // SPLPAR characteristics
+ };
+ const int devfd = open(DEVPATH, O_RDONLY);
+
+ SKIP_IF_MSG(devfd < 0 && errno == ENOENT,
+ DEVPATH " not present");
+
+ FAIL_IF(devfd < 0);
+ FAIL_IF(ioctl(devfd, PAPR_SYSPARM_IOC_GET, &sp) != 0);
+ FAIL_IF(sp.length == 0);
+ FAIL_IF(sp.length > sizeof(sp.data));
+ FAIL_IF(close(devfd) != 0);
+
+ return 0;
+}
+
+static int get_bad_parameter(void)
+{
+ struct papr_sysparm_io_block sp = {
+ .parameter = UINT32_MAX, // there are only ~60 specified parameters
+ };
+ const int devfd = open(DEVPATH, O_RDONLY);
+
+ SKIP_IF_MSG(devfd < 0 && errno == ENOENT,
+ DEVPATH " not present");
+
+ FAIL_IF(devfd < 0);
+
+ // Ensure expected error
+ FAIL_IF(ioctl(devfd, PAPR_SYSPARM_IOC_GET, &sp) != -1);
+ FAIL_IF(errno != EOPNOTSUPP);
+
+ // Ensure the buffer is unchanged
+ FAIL_IF(sp.length != 0);
+ for (size_t i = 0; i < ARRAY_SIZE(sp.data); ++i)
+ FAIL_IF(sp.data[i] != 0);
+
+ FAIL_IF(close(devfd) != 0);
+
+ return 0;
+}
+
+static int check_efault_common(unsigned long cmd)
+{
+ const int devfd = open(DEVPATH, O_RDWR);
+
+ SKIP_IF_MSG(devfd < 0 && errno == ENOENT,
+ DEVPATH " not present");
+
+ FAIL_IF(devfd < 0);
+
+ // Ensure expected error
+ FAIL_IF(ioctl(devfd, cmd, NULL) != -1);
+ FAIL_IF(errno != EFAULT);
+
+ FAIL_IF(close(devfd) != 0);
+
+ return 0;
+}
+
+static int check_efault_get(void)
+{
+ return check_efault_common(PAPR_SYSPARM_IOC_GET);
+}
+
+static int check_efault_set(void)
+{
+ return check_efault_common(PAPR_SYSPARM_IOC_SET);
+}
+
+static int set_hmc0(void)
+{
+ struct papr_sysparm_io_block sp = {
+ .parameter = 0, // HMC0, not a settable parameter
+ };
+ const int devfd = open(DEVPATH, O_RDWR);
+
+ SKIP_IF_MSG(devfd < 0 && errno == ENOENT,
+ DEVPATH " not present");
+
+ FAIL_IF(devfd < 0);
+
+ // Ensure expected error
+ FAIL_IF(ioctl(devfd, PAPR_SYSPARM_IOC_SET, &sp) != -1);
+ SKIP_IF_MSG(errno == EOPNOTSUPP, "operation not supported");
+ FAIL_IF(errno != EPERM);
+
+ FAIL_IF(close(devfd) != 0);
+
+ return 0;
+}
+
+static int set_with_ro_fd(void)
+{
+ struct papr_sysparm_io_block sp = {
+ .parameter = 0, // HMC0, not a settable parameter.
+ };
+ const int devfd = open(DEVPATH, O_RDONLY);
+
+ SKIP_IF_MSG(devfd < 0 && errno == ENOENT,
+ DEVPATH " not present");
+
+ FAIL_IF(devfd < 0);
+
+ // Ensure expected error
+ FAIL_IF(ioctl(devfd, PAPR_SYSPARM_IOC_SET, &sp) != -1);
+ SKIP_IF_MSG(errno == EOPNOTSUPP, "operation not supported");
+
+ // HMC0 isn't a settable parameter and we would normally
+ // expect to get EPERM on attempts to modify it. However, when
+ // the file is open read-only, we expect the driver to prevent
+ // the attempt with a distinct error.
+ FAIL_IF(errno != EBADF);
+
+ FAIL_IF(close(devfd) != 0);
+
+ return 0;
+}
+
+struct sysparm_test {
+ int (*function)(void);
+ const char *description;
+};
+
+static const struct sysparm_test sysparm_tests[] = {
+ {
+ .function = open_close,
+ .description = "open and close " DEVPATH " without issuing commands",
+ },
+ {
+ .function = get_splpar,
+ .description = "retrieve SPLPAR characteristics",
+ },
+ {
+ .function = get_bad_parameter,
+ .description = "verify EOPNOTSUPP for known-bad parameter",
+ },
+ {
+ .function = check_efault_get,
+ .description = "PAPR_SYSPARM_IOC_GET returns EFAULT on bad address",
+ },
+ {
+ .function = check_efault_set,
+ .description = "PAPR_SYSPARM_IOC_SET returns EFAULT on bad address",
+ },
+ {
+ .function = set_hmc0,
+ .description = "ensure EPERM on attempt to update HMC0",
+ },
+ {
+ .function = set_with_ro_fd,
+ .description = "PAPR_IOC_SYSPARM_SET returns EACCESS on read-only fd",
+ },
+};
+
+int main(void)
+{
+ size_t fails = 0;
+
+ for (size_t i = 0; i < ARRAY_SIZE(sysparm_tests); ++i) {
+ const struct sysparm_test *t = &sysparm_tests[i];
+
+ if (test_harness(t->function, t->description))
+ ++fails;
+ }
+
+ return fails == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}