[Bug 111895] [CI][BAT] igt at i915_selftest@live_execlists/live_unlite_switch - dmesg-fail: timed out, cancelling all further testing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111895

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hopefully it is the problem I was aiming for in the test...


commit 2935ed5339c495066d901b97de384d86c55a3f6d
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Oct 4 14:40:08 2019 +0100

    drm/i915: Remove logical HW ID

    With the introduction of ctx->engines[] we allow multiple logical
    contexts to be used on the same engine (e.g. with virtual engines).
    According to bspec, aach logical context requires a unique tag in order
    for context-switching to occur correctly between them. [Simple
    experiments show that it is not so easy to trick the HW into performing
    a lite-restore with matching logical IDs, though my memory from early
    Broadwell experiments do suggest that it should be generating
    lite-restores.]

    We only need to keep a unique tag for the active lifetime of the
    context, and for as long as we need to identify that context. The HW
    uses the tag to determine if it should use a lite-restore (why not the
    LRCA?) and passes the tag back for various status identifies. The only
    status we need to track is for OA, so when using perf, we assign the
    specific context a unique tag.

    v2: Calculate required number of tags to fill ELSP.

    Fixes: 976b55f0e1db ("drm/i915: Allow a context to define its set of
engines
")
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111895
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Acked-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20191004134015.13204-14-chris@chris-wilson.co.uk

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