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authorRob Clark <robclark@freedesktop.org>2013-04-25 16:36:15 -0400
committerRob Clark <robclark@freedesktop.org>2013-04-25 17:33:59 -0400
commitb3a3a77823ada2eb37233678b5a49efaec9b75cb (patch)
treef7ca28117adf931551667fc4b020922494408987 /tests/modetest
parentec3c257eb6958da493aee6f010f51a07d7ba4160 (diff)
freedreno: add synchronization between mesa and ddx
Super-cheezy way to synchronization between mesa and ddx.. the SET_ACTIVE ioctl gives us a way to stash a 32b # w/ a GEM bo, and GET_BUFINFO gives us a way to retrieve it. We use this to stash the timestamp of the last ISSUEIBCMDS on the buffer. To avoid an obscene amount of syscalls, we: 1) Only set the timestamp for buffers w/ an flink name, ie. only buffers shared across processes. This is enough to catch the DRI2 buffers. 2) Only set the timestamp for buffers submitted to the 3d ring and only check the timestamps on buffers submitted to the 2d ring. This should be enough to handle synchronizing of presentation blit. We could do synchronization in the other direction too, but that would be problematic if we are using the 3d ring from DDX, since client side wouldn't know this. The waiting on timestamp happens before flush, and setting of timestamp happens after flush. It is transparent to the user of libdrm_freedreno as all the tracking of buffers happens via _emit_reloc().. Signed-off-by: Rob Clark <robclark@freedesktop.org>
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