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drm/i915/selftests: Test i915_sw_fence/dma_fence interop 

Check that we can successfully wait upon a dma_fence using the
i915_sw_fence, including the optional timeout mechanism.

v2: Account for the rounding up of the timeout to the next second.
Unfortunately, the minimum delay is then 1 second.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180115204348.8480-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Chris Wilson 2018-01-15 20:43:48 +00:00
parent beacbd1615
commit 2aa472c827
1 changed files with 136 additions and 0 deletions
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136
drivers/gpu/drm/i915/selftests/i915_sw_fence.c
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@ -606,6 +606,141 @@ static int test_timer(void *arg)
return -EINVAL;
}
static const char *mock_name(struct dma_fence *fence)
{
return "mock";
}
static bool mock_enable_signaling(struct dma_fence *fence)
{
return true;
}
static const struct dma_fence_ops mock_fence_ops = {
.get_driver_name = mock_name,
.get_timeline_name = mock_name,
.enable_signaling = mock_enable_signaling,
.wait = dma_fence_default_wait,
.release = dma_fence_free,
};
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, skipping!\n", delay);
goto skip;
}
if (i915_sw_fence_done(timeout) || i915_sw_fence_done(not)) {
pr_err("Fences signaled too early\n");
goto err;
}
do {
sleep = jiffies_to_usecs(end - jiffies + 1);
usleep_range(sleep, 2 * sleep);
} while (!time_after(jiffies, end));
if (i915_sw_fence_done(not)) {
pr_err("No timeout fence signaled!\n");
goto err;
}
if (!i915_sw_fence_done(timeout)) {
pr_err("Timeout fence unsignaled!\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[] = {
@ -618,6 +753,7 @@ int i915_sw_fence_mock_selftests(void)
SUBTEST(test_chain),
SUBTEST(test_ipc),
SUBTEST(test_timer),
SUBTEST(test_dma_fence),
};
return i915_subtests(tests, NULL);