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igt/gem_concurrent_blit: Allocate a private batch cache for the child

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We have to avoid the COW alias for the intel_bufmgr and intel_batch
cache as the child may close the object (in its local cache) leaving an
alias in the parent cache pointing to a stale object.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-01-22 22:14:33 +00:00
parent 3eae640b81
commit 69ecedea73
1 changed files with 13 additions and 1 deletions
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14
tests/gem_concurrent_all.c
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@ -1135,9 +1135,21 @@ static void run_child(struct buffers *buffers,
do_hang do_hang_func)
{
igt_fork(child, 1)
/* We inherit the buffers from the parent, but the bufmgr/batch
* needs to be local as the cache of reusable itself will be COWed,
* leading to the child closing an object without the parent knowing.
*/
igt_fork(child, 1) {
buffers->bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
drm_intel_bufmgr_gem_enable_reuse(buffers->bufmgr);
batch = intel_batchbuffer_alloc(buffers->bufmgr, devid);
do_test_func(buffers, do_copy_func, do_hang_func);
intel_batchbuffer_free(batch);
drm_intel_bufmgr_destroy(buffers->bufmgr);
}
igt_waitchildren();
igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
}