Bug 69104 - Using stolen framebuffers and ringbuffers leads to incoherent CS reads
Summary: Using stolen framebuffers and ringbuffers leads to incoherent CS reads
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: Other All
: medium normal
Assignee: Jesse Barnes
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-09-08 15:46 UTC by Chris Wilson
Modified: 2017-07-24 22:57 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments
error (2.14 MB, text/plain)
2013-09-08 15:46 UTC, Chris Wilson 		no flags Details
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Description Chris Wilson 2013-09-08 15:46:41 UTC 
Created attachment 85434 [details]
error

Note:

  ACTHD: 0x01a62044
    at batch: 0x01a62044
  IPEIR: 0x00000000
  IPEHR: 0xa12a1f8f

which is a long way past the end of the current batch 0x01a48000

Also note the object:   00043000     40776 04 48c7a000 2ed42030 3c6a7e38 P snooped or LLC

Sadly we don't record which objects were in stolen, here is it the framebuffers and ringbuffers.
Comment 1 Jani Nikula 2014-01-10 15:38:04 UTC 
Has anything been done about this?
Comment 2 Chris Wilson 2014-01-10 15:56:26 UTC 
We've identified the breakage as being introduced by Imre's sg_page_iter.
Comment 3 Daniel Vetter 2014-01-14 13:53:14 UTC 
Akash Goel has the patch, but there's some review pending:

http://patchwork.freedesktop.org/patch/17588/
Comment 4 Daniel Vetter 2014-01-28 08:06:06 UTC 
commit ec14ba47791965d2c08e0a681ff44eacbf3c4553
Author: Akash Goel <akash.goel@intel.com>
Date:   Mon Jan 13 16:24:45 2014 +0530

    drm/i915: Fix the offset issue for the stolen GEM objects

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