[Bug 110470] New: [drm/i915/icl]media driver see gpu hang issue caused by WaEnableStateCacheRedirectToCS context workaround configure for the L3 cache
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Apr 19 08:33:52 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=110470
Bug ID: 110470
Summary: [drm/i915/icl]media driver see gpu hang issue caused
by WaEnableStateCacheRedirectToCS context workaround
configure for the L3 cache
Product: DRI
Version: XOrg git
Hardware: x86 (IA32)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: carry.lv at intel.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 144044
--> https://bugs.freedesktop.org/attachment.cgi?id=144044&action=edit
attached finding root cause
Media driver see gpu hang randomly for VME cases.
The issue is root caused. The reason is conflicting Settings of L3 were used in
UMD and KMD.
In picture 1 is the setting of KMD in function icl_ctx_workarounds_init, which
enabled State Cache redirect to CS Command buffer section(bit11 of MMIO
0x731C). However, the L3 configuration of UMD(in Picture2) didn't assign any
space for CS Command buffer.
I tried to remove the WaEnableStateCacheRedirectToCS in KMD, the issue is gone.
WaEnableStateCacheRedirectToCS context workaround configures the L3 cache to
benefit 3d workloads but media has different requirements.
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