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linux-stable/tools/testing/selftests/iommu/iommufd_fail_nth.c
Jason Gunthorpe 65c619ae06 iommufd/selftest: Make selftest create a more complete mock device 
iommufd wants to use more infrastructure, like the iommu_group, that the
mock device does not support. Create a more complete mock device that can
go through the whole cycle of ownership, blocking domain, and has an
iommu_group.

This requires creating a real struct device on a real bus to be able to
connect it to a iommu_group. Unfortunately we cannot formally attach the
mock iommu driver as an actual driver as the iommu core does not allow
more than one driver or provide a general way for busses to link to
iommus. This can be solved with a little hack to open code the dev_iommus
struct.

With this infrastructure things work exactly the same as the normal domain
path, including the auto domains mechanism and direct attach of hwpts.  As
the created hwpt is now an autodomain it is no longer required to destroy
it and trying to do so will trigger a failure.

Link: https://lore.kernel.org/r/11-v3-ae9c2975a131+2e1e8-iommufd_hwpt_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2023-03-06 13:06:11 -04:00

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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
*
* These tests are "kernel integrity" tests. They are looking for kernel
* WARN/OOPS/kasn/etc splats triggered by kernel sanitizers & debugging
* features. It does not attempt to verify that the system calls are doing what
* they are supposed to do.
*
* The basic philosophy is to run a sequence of calls that will succeed and then
* sweep every failure injection point on that call chain to look for
* interesting things in error handling.
*
* This test is best run with:
* echo 1 > /proc/sys/kernel/panic_on_warn
* If something is actually going wrong.
*/
#include <fcntl.h>
#include <dirent.h>
#define __EXPORTED_HEADERS__
#include <linux/vfio.h>
#include "iommufd_utils.h"
static bool have_fault_injection;
static int writeat(int dfd, const char *fn, const char *val)
{
size_t val_len = strlen(val);
ssize_t res;
int fd;
fd = openat(dfd, fn, O_WRONLY);
if (fd == -1)
return -1;
res = write(fd, val, val_len);
assert(res == val_len);
close(fd);
return 0;
}
static __attribute__((constructor)) void setup_buffer(void)
{
BUFFER_SIZE = 2*1024*1024;
buffer = mmap(0, BUFFER_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
}
/*
* This sets up fail_injection in a way that is useful for this test.
* It does not attempt to restore things back to how they were.
*/
static __attribute__((constructor)) void setup_fault_injection(void)
{
DIR *debugfs = opendir("/sys/kernel/debug/");
struct dirent *dent;
if (!debugfs)
return;
/* Allow any allocation call to be fault injected */
if (writeat(dirfd(debugfs), "failslab/ignore-gfp-wait", "N"))
return;
writeat(dirfd(debugfs), "fail_page_alloc/ignore-gfp-wait", "N");
writeat(dirfd(debugfs), "fail_page_alloc/ignore-gfp-highmem", "N");
while ((dent = readdir(debugfs))) {
char fn[300];
if (strncmp(dent->d_name, "fail", 4) != 0)
continue;
/* We are looking for kernel splats, quiet down the log */
snprintf(fn, sizeof(fn), "%s/verbose", dent->d_name);
writeat(dirfd(debugfs), fn, "0");
}
closedir(debugfs);
have_fault_injection = true;
}
struct fail_nth_state {
int proc_fd;
unsigned int iteration;
};
static void fail_nth_first(struct __test_metadata *_metadata,
struct fail_nth_state *nth_state)
{
char buf[300];
snprintf(buf, sizeof(buf), "/proc/self/task/%u/fail-nth", getpid());
nth_state->proc_fd = open(buf, O_RDWR);
ASSERT_NE(-1, nth_state->proc_fd);
}
static bool fail_nth_next(struct __test_metadata *_metadata,
struct fail_nth_state *nth_state,
int test_result)
{
static const char disable_nth[] = "0";
char buf[300];
/*
* This is just an arbitrary limit based on the current kernel
* situation. Changes in the kernel can dramtically change the number of
* required fault injection sites, so if this hits it doesn't
* necessarily mean a test failure, just that the limit has to be made
* bigger.
*/
ASSERT_GT(400, nth_state->iteration);
if (nth_state->iteration != 0) {
ssize_t res;
ssize_t res2;
buf[0] = 0;
/*
* Annoyingly disabling the nth can also fail. This means
* the test passed without triggering failure
*/
res = pread(nth_state->proc_fd, buf, sizeof(buf), 0);
if (res == -1 && errno == EFAULT) {
buf[0] = '1';
buf[1] = '\n';
res = 2;
}
res2 = pwrite(nth_state->proc_fd, disable_nth,
ARRAY_SIZE(disable_nth) - 1, 0);
if (res2 == -1 && errno == EFAULT) {
res2 = pwrite(nth_state->proc_fd, disable_nth,
ARRAY_SIZE(disable_nth) - 1, 0);
buf[0] = '1';
buf[1] = '\n';
}
ASSERT_EQ(ARRAY_SIZE(disable_nth) - 1, res2);
/* printf(" nth %u result=%d nth=%u\n", nth_state->iteration,
test_result, atoi(buf)); */
fflush(stdout);
ASSERT_LT(1, res);
if (res != 2 || buf[0] != '0' || buf[1] != '\n')
return false;
} else {
/* printf(" nth %u result=%d\n", nth_state->iteration,
test_result); */
}
nth_state->iteration++;
return true;
}
/*
* This is called during the test to start failure injection. It allows the test
* to do some setup that has already been swept and thus reduce the required
* iterations.
*/
void __fail_nth_enable(struct __test_metadata *_metadata,
struct fail_nth_state *nth_state)
{
char buf[300];
size_t len;
if (!nth_state->iteration)
return;
len = snprintf(buf, sizeof(buf), "%u", nth_state->iteration);
ASSERT_EQ(len, pwrite(nth_state->proc_fd, buf, len, 0));
}
#define fail_nth_enable() __fail_nth_enable(_metadata, _nth_state)
#define TEST_FAIL_NTH(fixture_name, name) \
static int test_nth_##name(struct __test_metadata *_metadata, \
FIXTURE_DATA(fixture_name) *self, \
const FIXTURE_VARIANT(fixture_name) \
*variant, \
struct fail_nth_state *_nth_state); \
TEST_F(fixture_name, name) \
{ \
struct fail_nth_state nth_state = {}; \
int test_result = 0; \
\
if (!have_fault_injection) \
SKIP(return, \
"fault injection is not enabled in the kernel"); \
fail_nth_first(_metadata, &nth_state); \
ASSERT_EQ(0, test_nth_##name(_metadata, self, variant, \
&nth_state)); \
while (fail_nth_next(_metadata, &nth_state, test_result)) { \
fixture_name##_teardown(_metadata, self, variant); \
fixture_name##_setup(_metadata, self, variant); \
test_result = test_nth_##name(_metadata, self, \
variant, &nth_state); \
}; \
ASSERT_EQ(0, test_result); \
} \
static int test_nth_##name( \
struct __test_metadata __attribute__((unused)) *_metadata, \
FIXTURE_DATA(fixture_name) __attribute__((unused)) *self, \
const FIXTURE_VARIANT(fixture_name) __attribute__((unused)) \
*variant, \
struct fail_nth_state *_nth_state)
FIXTURE(basic_fail_nth)
{
int fd;
uint32_t access_id;
};
FIXTURE_SETUP(basic_fail_nth)
{
self->fd = -1;
self->access_id = 0;
}
FIXTURE_TEARDOWN(basic_fail_nth)
{
int rc;
if (self->access_id) {
/* The access FD holds the iommufd open until it closes */
rc = _test_cmd_destroy_access(self->access_id);
assert(rc == 0);
}
teardown_iommufd(self->fd, _metadata);
}
/* Cover ioas.c */
TEST_FAIL_NTH(basic_fail_nth, basic)
{
struct iommu_iova_range ranges[10];
uint32_t ioas_id;
__u64 iova;
fail_nth_enable();
self->fd = open("/dev/iommu", O_RDWR);
if (self->fd == -1)
return -1;
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
return -1;
{
struct iommu_ioas_iova_ranges ranges_cmd = {
.size = sizeof(ranges_cmd),
.num_iovas = ARRAY_SIZE(ranges),
.ioas_id = ioas_id,
.allowed_iovas = (uintptr_t)ranges,
};
if (ioctl(self->fd, IOMMU_IOAS_IOVA_RANGES, &ranges_cmd))
return -1;
}
{
struct iommu_ioas_allow_iovas allow_cmd = {
.size = sizeof(allow_cmd),
.ioas_id = ioas_id,
.num_iovas = 1,
.allowed_iovas = (uintptr_t)ranges,
};
ranges[0].start = 16*1024;
ranges[0].last = BUFFER_SIZE + 16 * 1024 * 600 - 1;
if (ioctl(self->fd, IOMMU_IOAS_ALLOW_IOVAS, &allow_cmd))
return -1;
}
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, BUFFER_SIZE, &iova,
IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE))
return -1;
{
struct iommu_ioas_copy copy_cmd = {
.size = sizeof(copy_cmd),
.flags = IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE,
.dst_ioas_id = ioas_id,
.src_ioas_id = ioas_id,
.src_iova = iova,
.length = sizeof(ranges),
};
if (ioctl(self->fd, IOMMU_IOAS_COPY, &copy_cmd))
return -1;
}
if (_test_ioctl_ioas_unmap(self->fd, ioas_id, iova, BUFFER_SIZE,
NULL))
return -1;
/* Failure path of no IOVA to unmap */
_test_ioctl_ioas_unmap(self->fd, ioas_id, iova, BUFFER_SIZE, NULL);
return 0;
}
/* iopt_area_fill_domains() and iopt_area_fill_domain() */
TEST_FAIL_NTH(basic_fail_nth, map_domain)
{
uint32_t ioas_id;
__u32 stdev_id;
__u32 hwpt_id;
__u64 iova;
self->fd = open("/dev/iommu", O_RDWR);
if (self->fd == -1)
return -1;
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
return -1;
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
return -1;
fail_nth_enable();
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id, &hwpt_id))
return -1;
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, 262144, &iova,
IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE))
return -1;
if (_test_ioctl_destroy(self->fd, stdev_id))
return -1;
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id, &hwpt_id))
return -1;
return 0;
}
TEST_FAIL_NTH(basic_fail_nth, map_two_domains)
{
uint32_t ioas_id;
__u32 stdev_id2;
__u32 stdev_id;
__u32 hwpt_id2;
__u32 hwpt_id;
__u64 iova;
self->fd = open("/dev/iommu", O_RDWR);
if (self->fd == -1)
return -1;
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
return -1;
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
return -1;
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id, &hwpt_id))
return -1;
fail_nth_enable();
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id2, &hwpt_id2))
return -1;
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, 262144, &iova,
IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE))
return -1;
if (_test_ioctl_destroy(self->fd, stdev_id))
return -1;
if (_test_ioctl_destroy(self->fd, stdev_id2))
return -1;
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id, &hwpt_id))
return -1;
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id2, &hwpt_id2))
return -1;
return 0;
}
TEST_FAIL_NTH(basic_fail_nth, access_rw)
{
uint64_t tmp_big[4096];
uint32_t ioas_id;
uint16_t tmp[32];
__u64 iova;
self->fd = open("/dev/iommu", O_RDWR);
if (self->fd == -1)
return -1;
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
return -1;
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
return -1;
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, 262144, &iova,
IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE))
return -1;
fail_nth_enable();
if (_test_cmd_create_access(self->fd, ioas_id, &self->access_id, 0))
return -1;
{
struct iommu_test_cmd access_cmd = {
.size = sizeof(access_cmd),
.op = IOMMU_TEST_OP_ACCESS_RW,
.id = self->access_id,
.access_rw = { .iova = iova,
.length = sizeof(tmp),
.uptr = (uintptr_t)tmp },
};
// READ
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
access_cmd.access_rw.flags = MOCK_ACCESS_RW_WRITE;
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
access_cmd.access_rw.flags = MOCK_ACCESS_RW_SLOW_PATH;
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
access_cmd.access_rw.flags = MOCK_ACCESS_RW_SLOW_PATH |
MOCK_ACCESS_RW_WRITE;
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
}
{
struct iommu_test_cmd access_cmd = {
.size = sizeof(access_cmd),
.op = IOMMU_TEST_OP_ACCESS_RW,
.id = self->access_id,
.access_rw = { .iova = iova,
.flags = MOCK_ACCESS_RW_SLOW_PATH,
.length = sizeof(tmp_big),
.uptr = (uintptr_t)tmp_big },
};
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
}
if (_test_cmd_destroy_access(self->access_id))
return -1;
self->access_id = 0;
return 0;
}
/* pages.c access functions */
TEST_FAIL_NTH(basic_fail_nth, access_pin)
{
uint32_t access_pages_id;
uint32_t ioas_id;
__u64 iova;
self->fd = open("/dev/iommu", O_RDWR);
if (self->fd == -1)
return -1;
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
return -1;
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
return -1;
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, BUFFER_SIZE, &iova,
IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE))
return -1;
if (_test_cmd_create_access(self->fd, ioas_id, &self->access_id,
MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES))
return -1;
fail_nth_enable();
{
struct iommu_test_cmd access_cmd = {
.size = sizeof(access_cmd),
.op = IOMMU_TEST_OP_ACCESS_PAGES,
.id = self->access_id,
.access_pages = { .iova = iova,
.length = BUFFER_SIZE,
.uptr = (uintptr_t)buffer },
};
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
access_pages_id = access_cmd.access_pages.out_access_pages_id;
}
if (_test_cmd_destroy_access_pages(self->fd, self->access_id,
access_pages_id))
return -1;
if (_test_cmd_destroy_access(self->access_id))
return -1;
self->access_id = 0;
return 0;
}
/* iopt_pages_fill_xarray() */
TEST_FAIL_NTH(basic_fail_nth, access_pin_domain)
{
uint32_t access_pages_id;
uint32_t ioas_id;
__u32 stdev_id;
__u32 hwpt_id;
__u64 iova;
self->fd = open("/dev/iommu", O_RDWR);
if (self->fd == -1)
return -1;
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
return -1;
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
return -1;
if (_test_cmd_mock_domain(self->fd, ioas_id, &stdev_id, &hwpt_id))
return -1;
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, BUFFER_SIZE, &iova,
IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE))
return -1;
if (_test_cmd_create_access(self->fd, ioas_id, &self->access_id,
MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES))
return -1;
fail_nth_enable();
{
struct iommu_test_cmd access_cmd = {
.size = sizeof(access_cmd),
.op = IOMMU_TEST_OP_ACCESS_PAGES,
.id = self->access_id,
.access_pages = { .iova = iova,
.length = BUFFER_SIZE,
.uptr = (uintptr_t)buffer },
};
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
&access_cmd))
return -1;
access_pages_id = access_cmd.access_pages.out_access_pages_id;
}
if (_test_cmd_destroy_access_pages(self->fd, self->access_id,
access_pages_id))
return -1;
if (_test_cmd_destroy_access(self->access_id))
return -1;
self->access_id = 0;
if (_test_ioctl_destroy(self->fd, stdev_id))
return -1;
return 0;
}
TEST_HARNESS_MAIN
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