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ELK seems to very picky about the preconditions to reset. Evidence on Eaglelake (8086:2e12 (rev 03)) shows that it does not like if reset occurs when there is active ring. Ville found out that there is workaround with name 'WaMediaResetMainRingCleanup' which suggests that we need to cleanup rings before resetting. It is unclear what cleanup exactly means but evidence shows that stopping the ring does have an effect on reset reliability. This patch makes reset successful on hangs induced by chained batches (the igt ones). Note that if the hang is inside a shader, it is possible that our attempts to stop the ring achieves anything. v2: zero ctl,head,tail also. bug ref. use driver debugs (Chris) v3: specify platform on testcases, comment tidyup (Chris) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100942 Testcase: igt/gem_busy/*-hang #elk Testcase: igt/gem_ringfill/hang-* #elk Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tomi Sarvela <tomi.p.sarvela@intel.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170519091340.21439-1-mika.kuoppala@intel.com |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.