/*
* Copyright © 2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/prime_numbers.h>
#include "../i915_selftest.h"
static int
fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
{
switch (state) {
case FENCE_COMPLETE:
break;
case FENCE_FREE:
/* Leave the fence for the caller to free it after testing */
break;
}
return NOTIFY_DONE;
}
static struct i915_sw_fence *alloc_fence(void)
{
struct i915_sw_fence *fence;
fence = kmalloc(sizeof(*fence), GFP_KERNEL);
if (!fence)
return NULL;
i915_sw_fence_init(fence, fence_notify);
return fence;
}
static void free_fence(struct i915_sw_fence *fence)
{
i915_sw_fence_fini(fence);
kfree(fence);
}
static int __test_self(struct i915_sw_fence *fence)
{
if (i915_sw_fence_done(fence))
return -EINVAL;
i915_sw_fence_commit(fence);
if (!i915_sw_fence_done(fence))
return -EINVAL;
i915_sw_fence_wait(fence);
if (!i915_sw_fence_done(fence))
return -EINVAL;
return 0;
}
static int test_self(void *arg)
{
struct i915_sw_fence *fence;
int ret;
/* Test i915_sw_fence signaling and completion testing */
fence = alloc_fence();
if (!fence)
return -ENOMEM;
ret = __test_self(fence);
free_fence(fence);
return ret;
}
static int test_dag(void *arg)
{
struct i915_sw_fence *A, *B, *C;
int ret = -EINVAL;
/* Test detection of cycles within the i915_sw_fence graphs */
if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG))
return 0;
A = alloc_fence();
if (!A)
return -ENOMEM;
if (i915_sw_fence_await_sw_fence_gfp(A, A, GFP_KERNEL) != -EINVAL) {
pr_err("recursive cycle not detected (AA)\n");
goto err_A;
}
B = alloc_fence();
if (!B) {
ret = -ENOMEM;
goto err_A;
}
i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
if (i915_sw_fence_await_sw_fence_gfp(B, A, GFP_KERNEL) != -EINVAL) {
pr_err("single depth cycle not detected (BAB)\n");
goto err_B;
}
C = alloc_fence();
if (!C) {
ret = -ENOMEM;
goto err_B;
}
if (i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL) == -EINVAL) {
pr_err("invalid cycle detected\n");
goto err_C;
}
if (i915_sw_fence_await_sw_fence_gfp(C, B, GFP_KERNEL) != -EINVAL) {
pr_err("single depth cycle not detected (CBC)\n");
goto err_C;
}
if (i915_sw_fence_await_sw_fence_gfp(C, A, GFP_KERNEL) != -EINVAL) {
pr_err("cycle not detected (BA, CB, AC)\n");
goto err_C;
}
if (i915_sw_fence_await_sw_fence_gfp(A, C, GFP_KERNEL) == -EINVAL) {
pr_err("invalid cycle detected\n");
goto err_C;
}
i915_sw_fence_commit(A);
i915_sw_fence_commit(B);
i915_sw_fence_commit(C);
ret = 0;
if (!i915_sw_fence_done(C)) {
pr_err("fence C not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(B)) {
pr_err("fence B not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(A)) {
pr_err("fence A not done\n");
ret = -EINVAL;
}
err_C:
free_fence(C);
err_B:
free_fence(B);
err_A:
free_fence(A);
return ret;
}
static int test_AB(void *arg)
{
struct i915_sw_fence *A, *B;
int ret;
/* Test i915_sw_fence (A) waiting on an event source (B) */
A = alloc_fence();
if (!A)
return -ENOMEM;
B = alloc_fence();
if (!B) {
ret = -ENOMEM;
goto err_A;
}
ret = i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
if (ret < 0)
goto err_B;
if (ret == 0) {
pr_err("Incorrectly reported fence A was complete before await\n");
ret = -EINVAL;
goto err_B;
}
ret = -EINVAL;
i915_sw_fence_commit(A);
if (i915_sw_fence_done(A))
goto err_B;
i915_sw_fence_commit(B);
if (!i915_sw_fence_done(B)) {
pr_err("Fence B is not done\n");
goto err_B;
}
if (!i915_sw_fence_done(A)) {
pr_err("Fence A is not done\n");
goto err_B;
}
ret = 0;
err_B:
free_fence(B);
err_A:
free_fence(A);
return ret;
}
static int test_ABC(void *arg)
{
struct i915_sw_fence *A, *B, *C;
int ret;
/* Test a chain of fences, A waits on B who waits on C */
A = alloc_fence();
if (!A)
return -ENOMEM;
B = alloc_fence();
if (!B) {
ret = -ENOMEM;
goto err_A;
}
C = alloc_fence();
if (!C) {
ret = -ENOMEM;
goto err_B;
}
ret = i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
if (ret < 0)
goto err_C;
if (ret == 0) {
pr_err("Incorrectly reported fence B was complete before await\n");
goto err_C;
}
ret = i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL);
if (ret < 0)
goto err_C;
if (ret == 0) {
pr_err("Incorrectly reported fence C was complete before await\n");
goto err_C;
}
ret = -EINVAL;
i915_sw_fence_commit(A);
if (i915_sw_fence_done(A)) {
pr_err("Fence A completed early\n");
goto err_C;
}
i915_sw_fence_commit(B);
if (i915_sw_fence_done(B)) {
pr_err("Fence B completed early\n");
goto err_C;
}
if (i915_sw_fence_done(A)) {
pr_err("Fence A completed early (after signaling B)\n");
goto err_C;
}
i915_sw_fence_commit(C);
ret = 0;
if (!i915_sw_fence_done(C)) {
pr_err("Fence C not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(B)) {
pr_err("Fence B not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(A)) {
pr_err("Fence A not done\n");
ret = -EINVAL;
}
err_C:
free_fence(C);
err_B:
free_fence(B);
err_A:
free_fence(A);
return ret;
}
static int test_AB_C(void *arg)
{
struct i915_sw_fence *A, *B, *C;
int ret = -EINVAL;
/* Test multiple fences (AB) waiting on a single event (C) */
A = alloc_fence();
if (!A)
return -ENOMEM;
B = alloc_fence();
if (!B) {
ret = -ENOMEM;
goto err_A;
}
C = alloc_fence();
if (!C) {
ret = -ENOMEM;
goto err_B;
}
ret = i915_sw_fence_await_sw_fence_gfp(A, C, GFP_KERNEL);
if (ret < 0)
goto err_C;
if (ret == 0) {
ret = -EINVAL;
goto err_C;
}
ret = i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL);
if (ret < 0)
goto err_C;
if (ret == 0) {
ret = -EINVAL;
goto err_C;
}
i915_sw_fence_commit(A);
i915_sw_fence_commit(B);
ret = 0;
if (i915_sw_fence_done(A)) {
pr_err("Fence A completed early\n");
ret = -EINVAL;
}
if (i915_sw_fence_done(B)) {
pr_err("Fence B completed early\n");
ret = -EINVAL;
}
i915_sw_fence_commit(C);
if (!i915_sw_fence_done(C)) {
pr_err("Fence C not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(B)) {
pr_err("Fence B not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(A)) {
pr_err("Fence A not done\n");
ret = -EINVAL;
}
err_C:
free_fence(C);
err_B:
free_fence(B);
err_A:
free_fence(A);
return ret;
}
static int test_C_AB(void *arg)
{
struct i915_sw_fence *A, *B, *C;
int ret;
/* Test multiple event sources (A,B) for a single fence (C) */
A = alloc_fence();
if (!A)
return -ENOMEM;
B = alloc_fence();
if (!B) {
ret = -ENOMEM;
goto err_A;
}
C = alloc_fence();
if (!C) {
ret = -ENOMEM;
goto err_B;
}
ret = i915_sw_fence_await_sw_fence_gfp(C, A, GFP_KERNEL);
if (ret < 0)
goto err_C;
if (ret == 0) {
ret = -EINVAL;
goto err_C;
}
ret = i915_sw_fence_await_sw_fence_gfp(C, B, GFP_KERNEL);
if (ret < 0)
goto err_C;
if (ret == 0) {
ret = -EINVAL;
goto err_C;
}
ret = 0;
i915_sw_fence_commit(C);
if (i915_sw_fence_done(C))
ret = -EINVAL;
i915_sw_fence_commit(A);
i915_sw_fence_commit(B);
if (!i915_sw_fence_done(A)) {
pr_err("Fence A not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(B)) {
pr_err("Fence B not done\n");
ret = -EINVAL;
}
if (!i915_sw_fence_done(C)) {
pr_err("Fence C not done\n");
ret = -EINVAL;
}
err_C:
free_fence(C);
err_B:
free_fence(B);
err_A:
free_fence(A);
return ret;
}
static int test_chain(void *arg)
{
int nfences = 4096;
struct i915_sw_fence **fences;
int ret, i;
/* Test a long chain of fences */
fences = kmalloc_array(nfences, sizeof(*fences), GFP_KERNEL);
if (!fences)
return -ENOMEM;
for (i = 0; i < nfences; i++) {
fences[i] = alloc_fence();
if (!fences[i]) {
nfences = i;
ret = -ENOMEM;
goto err;
}
if (i > 0) {
ret = i915_sw_fence_await_sw_fence_gfp(fences[i],
fences[i - 1],
GFP_KERNEL);
if (ret < 0) {
nfences = i + 1;
goto err;
}
i915_sw_fence_commit(fences[i]);
}
}
ret = 0;
for (i = nfences; --i; ) {
if (i915_sw_fence_done(fences[i])) {
if (ret == 0)
pr_err("Fence[%d] completed early\n", i);
ret = -EINVAL;
}
}
i915_sw_fence_commit(fences[0]);
for (i = 0; ret == 0 && i < nfences; i++) {
if (!i915_sw_fence_done(fences[i])) {
pr_err("Fence[%d] is not done\n", i);
ret = -EINVAL;
}
}
err:
for (i = 0; i < nfences; i++)
free_fence(fences[i]);
kfree(fences);
return ret;
}
struct task_ipc {
struct work_struct work;
struct completion started;
struct i915_sw_fence *in, *out;
int value;
};
static void task_ipc(struct work_struct *work)
{
struct task_ipc *ipc = container_of(work, typeof(*ipc), work);
complete(&ipc->started);
i915_sw_fence_wait(ipc->in);
smp_store_mb(ipc->value, 1);
i915_sw_fence_commit(ipc->out);
}
static int test_ipc(void *arg)
{
struct task_ipc ipc;
struct workqueue_struct *wq;
int ret = 0;
wq = alloc_workqueue("i1915-selftest", 0, 0);
if (wq == NULL)
return -ENOMEM;
/* Test use of i915_sw_fence as an interprocess signaling mechanism */
ipc.in = alloc_fence();
if (!ipc.in) {
ret = -ENOMEM;
goto err_work;
}
ipc.out = alloc_fence();
if (!ipc.out) {
ret = -ENOMEM;
goto err_in;
}
/* use a completion to avoid chicken-and-egg testing */
init_completion(&ipc.started);
ipc.value = 0;
INIT_WORK_ONSTACK(&ipc.work, task_ipc);
queue_work(wq, &ipc.work);
wait_for_completion(&ipc.started);
usleep_range(1000, 2000);
if (READ_ONCE(ipc.value)) {
pr_err("worker updated value before i915_sw_fence was signaled\n");
ret = -EINVAL;
}
i915_sw_fence_commit(ipc.in);
i915_sw_fence_wait(ipc.out);
if (!READ_ONCE(ipc.value)) {
pr_err("worker signaled i915_sw_fence before value was posted\n");
ret = -EINVAL;
}
flush_work(&ipc.work);
destroy_work_on_stack(&ipc.work);
free_fence(ipc.out);
err_in:
free_fence(ipc.in);
err_work:
destroy_workqueue(wq);
return ret;
}
static int test_timer(void *arg)
{
unsigned long target, delay;
struct timed_fence tf;
preempt_disable();
timed_fence_init(&tf, target = jiffies);
if (!i915_sw_fence_done(&tf.fence)) {
pr_err("Fence with immediate expiration not signaled\n");
goto err;
}
preempt_enable();
timed_fence_fini(&tf);
for_each_prime_number(delay, i915_selftest.timeout_jiffies/2) {
preempt_disable();
timed_fence_init(&tf, target = jiffies + delay);
if (i915_sw_fence_done(&tf.fence)) {
pr_err("Fence with future expiration (%lu jiffies) already signaled\n", delay);
goto err;
}
preempt_enable();
i915_sw_fence_wait(&tf.fence);
preempt_disable();
if (!i915_sw_fence_done(&tf.fence)) {
pr_err("Fence not signaled after wait\n");
goto err;
}
if (time_before(jiffies, target)) {
pr_err("Fence signaled too early, target=%lu, now=%lu\n",
target, jiffies);
goto err;
}
preempt_enable();
timed_fence_fini(&tf);
}
return 0;
err:
preempt_enable();
timed_fence_fini(&tf);
return -EINVAL;
}
static const char *mock_name(struct dma_fence *fence)
{
return "mock";
}
static const struct dma_fence_ops mock_fence_ops = {
.get_driver_name = mock_name,
.get_timeline_name = mock_name,
};
static DEFINE_SPINLOCK(mock_fence_lock);
static struct dma_fence *alloc_dma_fence(void)
{
struct dma_fence *dma;
dma = kmalloc(sizeof(*dma), GFP_KERNEL);
if (dma)
dma_fence_init(dma, &mock_fence_ops, &mock_fence_lock, 0, 0);
return dma;
}
static struct i915_sw_fence *
wrap_dma_fence(struct dma_fence *dma, unsigned long delay)
{
struct i915_sw_fence *fence;
int err;
fence = alloc_fence();
if (!fence)
return ERR_PTR(-ENOMEM);
err = i915_sw_fence_await_dma_fence(fence, dma, delay, GFP_NOWAIT);
i915_sw_fence_commit(fence);
if (err < 0) {
free_fence(fence);
return ERR_PTR(err);
}
return fence;
}
static int test_dma_fence(void *arg)
{
struct i915_sw_fence *timeout = NULL, *not = NULL;
unsigned long delay = i915_selftest.timeout_jiffies;
unsigned long end, sleep;
struct dma_fence *dma;
int err;
dma = alloc_dma_fence();
if (!dma)
return -ENOMEM;
timeout = wrap_dma_fence(dma, delay);
if (IS_ERR(timeout)) {
err = PTR_ERR(timeout);
goto err;
}
not = wrap_dma_fence(dma, 0);
if (IS_ERR(not)) {
err = PTR_ERR(not);
goto err;
}
err = -EINVAL;
if (i915_sw_fence_done(timeout) || i915_sw_fence_done(not)) {
pr_err("Fences immediately signaled\n");
goto err;
}
/* We round the timeout for the fence up to the next second */
end = round_jiffies_up(jiffies + delay);
sleep = jiffies_to_usecs(delay) / 3;
usleep_range(sleep, 2 * sleep);
if (time_after(jiffies, end)) {
pr_debug("Slept too long, delay=%lu, (target=%lu, now=%lu) skipping\n",
delay, end, jiffies);
goto skip;
}
if (i915_sw_fence_done(timeout) || i915_sw_fence_done(not)) {
pr_err("Fences signaled too early\n");
goto err;
}
if (!wait_event_timeout(timeout->wait,
i915_sw_fence_done(timeout),
2 * (end - jiffies) + 1)) {
pr_err("Timeout fence unsignaled!\n");
goto err;
}
if (i915_sw_fence_done(not)) {
pr_err("No timeout fence signaled!\n");
goto err;
}
skip:
dma_fence_signal(dma);
if (!i915_sw_fence_done(timeout) || !i915_sw_fence_done(not)) {
pr_err("Fences unsignaled\n");
goto err;
}
free_fence(not);
free_fence(timeout);
dma_fence_put(dma);
return 0;
err:
dma_fence_signal(dma);
if (!IS_ERR_OR_NULL(timeout))
free_fence(timeout);
if (!IS_ERR_OR_NULL(not))
free_fence(not);
dma_fence_put(dma);
return err;
}
int i915_sw_fence_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
SUBTEST(test_self),
SUBTEST(test_dag),
SUBTEST(test_AB),
SUBTEST(test_ABC),
SUBTEST(test_AB_C),
SUBTEST(test_C_AB),
SUBTEST(test_chain),
SUBTEST(test_ipc),
SUBTEST(test_timer),
SUBTEST(test_dma_fence),
};
return i915_subtests(tests, NULL);
}
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