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// 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 EACCES 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;
}
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