Bug 43998

Summary:	[PNV] WebGl fail on pnv
Product:	Mesa	Reporter:	cc <chao.a.chen>
Component:	Drivers/DRI/i915	Assignee:	Eric Anholt <eric>
Status:	VERIFIED FIXED	QA Contact:
Severity:	major
Priority:	high	CC:	eric, idr, yuanhan.liu
Version:	git
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	42993

Description cc 2011-12-20 22:51:12 UTC

I tested webGl cases on pnv platform with the latest driver, But failed.It reported that "this brower does not appear to support webgl". and I also print the dmesg info : chrome[2699]: segfault at 2 ip 0a0500ba sp bfaff1b0 error 4 in chrome[8048000+2e0b000].

System Environment:
-------------------------- 
OSD:		Fedora release 13 (Goddard)
Kernel_version:		2.6.31.12
Libdrm:		(master)2.4.29-3-gef20301a11afae50bfe127002913dbd0b81ddccc
Mesa:		(master)67e6a40605c482617afa9bd698003ea15e8f8f6e


Reproduce steps:
----------------
1. ./piglit-run.py tests/webglc.tests cc

Comment 1 cc 2011-12-21 02:14:01 UTC

I bisect this error and get the first bad commit:

221a36514b4ecffdaa3be5c43e67c75cc8c30ab8 is the first bad commit
commit 221a36514b4ecffdaa3be5c43e67c75cc8c30ab8
Author: Eric Anholt <eric@anholt.net>
Date:   Mon Nov 28 11:02:59 2011 -0800

    intel: Make mapping of texture slices track the region of interest.
    
    This will be used for things like packed depth/stencil temporaries and
    making LLC-cached temporary mappings using blits.
    
    Reviewed-by: Chad Versace <chad.versace@linux.intel.com>

:040000 040000 0f604a0194b8564cbf662b27a315917b0c42b52b 

e8b4be0f6bc7c07b8d82a64f85c514515a4fee11 M	src

Comment 2 Gordon Jin 2012-01-12 00:59:00 UTC

This seems a big regression. Eric, comments?

Comment 3 Ian Romanick 2012-01-16 10:22:35 UTC

Chrome creates a separate process to detect whether WebGL should be supported on an implementation, and it looks like that process crashes in our driver with this change.

Comment 4 Eric Anholt 2012-01-25 10:59:50 UTC

There's no tests/webglc.tests in upstream piglit.  Is there a reason that hasn't been contributed back?

Comment 5 Eric Anholt 2012-01-25 17:42:18 UTC

Can you test again with master?  I just tried:

chromium --ignore-gpu-blacklist

and went to http://code.google.com/p/webglsamples/ and ran the aquarium demo, and it worked.

ii  chromium   12.0.742.112~r90304-1            Chromium browser

Comment 6 Ian Romanick 2012-02-02 16:25:36 UTC

ping: Please try to reproduce on current master and 8.0 branch.

Comment 7 cc 2012-02-02 18:36:57 UTC

This issue has been resolved on both master and 8.0 branch.

master:
Kernel_version:		2.6.31.12
Mesa:		(master)15986d21ebaaeedb234b066edba5cf7f6ea87a3c
Xserver:(master)xorg-server-1.11.99.902-3-g85cecd981191f9c3dab0fb13310d91eff643d423
Xf86_video_intel: (master)2.17.0-616-g55c7088f54655609fbb00106679a566b46ee8dba

8.0:
Kernel_version:		2.6.31.12
Libdrm:		(master)2.4.30-23-gc51f7f0e460dcadb9f1a56ecf1615810877c33c8
Mesa:		(8.0)7f5d3f7ed2ac42f00e4f848dd79b6223d95d7877
Xserver:		(server-1.11-branch)xorg-server-1.11.3

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