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tests/kms_fence_pin_leak: Exercise full ppgtt fence pin_count leak in the kernel

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The kernel full ppgtt support has a bug where it can drop a pinned
fence to the floor, hence we leak the pin_count as the subsequent
fence unpin becomes a nop. We can trigger it easily by unbinding a
buffer from a ppgtt address space while the buffer is simultaneosly
being used for scanout.

Make the kernel leak the fence pin_count and trick it into picking
a new fence register for the next scanout buffer. Looping like
this for a while we leak the pin_count for all fence registers after
which the kernel can no longer find a new fence register when it needs
one. As a result we get back a SIGBUS from the GTT mmap access.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Ville Syrjälä
2014-05-12 14:18:42 +03:00
parent 831eb21197
commit 78f79e4e95
2 changed files with 240 additions and 0 deletions
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tests/Makefile.sources
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@@ -60,6 +60,7 @@ TESTS_progs_M = \
kms_addfb \
kms_cursor_crc \
kms_fbc_crc \
kms_fence_pin_leak \
kms_flip \
kms_flip_tiling \
kms_pipe_crc_basic \