http://bugs.freedesktop.org/show_bug.cgi?id=14538
Summary: [core TTM] Premature fence timeouts.
Product: DRI
Version: DRI CVS
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM modules
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
Symtoms:
gltestperf times out with an -EBUSY (-16).
It's possible to feed enough rendering commands in a command FIFO for the GPU
to be busy more than 3 seconds, which is the default fence wait.
Proposed fix:
1) Add an issued_jiffies timestamp member to the fence. The fence maximum wait
time will be relative to this timestamp, instead of relative to the wait start.
This will remove all needs for extra user-space fence time-out checks.
2) If a timeout is hit, we call a device-specific callback "fence_timeout" that
checks in one way or another whether the GPU is still alive. In that case,
reset issued_jiffies to the current time. If not, Really time out.
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