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drm/i915: Switch to fake context on older gens

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We used to have per file descriptor hang stats for the
i915_get_reset_stats_ioctl() and for default context banning.

commit 0eea67eb26
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Fri Dec 6 14:11:19 2013 -0800

    drm/i915: Create a per file_priv default context

made having separate hangstats in file_private redundant
as i915_hw_context already contained hangstats. So

commit c482972a08
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Fri Dec 6 14:11:20 2013 -0800

    drm/i915: Piggy back hangstats off of contexts

consolidated the hangstats and enabled further improvements.

commit 44e2c0705a
Author: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date:   Thu Jan 30 16:01:15 2014 +0200

    drm/i915: Use i915_hw_context to set reset stats

tried to reap full benefits of consolidation but fell short
as we never 'switch' to the fake private context on gens
that don't have hw_contexts, so request->ctx remained NULL
on those.

Fix this by 'switching' to fake context so that when
request is submitted to ring, proper context gets assigned
to it.

Testcase: igt/drv_hangman
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76055
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2014-03-14 16:22:10 +02:00 committed by Daniel Vetter
parent 05efeebd28
commit a95f6a0070
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/i915/i915_gem_context.c
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@ -775,9 +775,11 @@ int i915_switch_context(struct intel_ring_buffer *ring,
BUG_ON(file && to == NULL);
/* We have the fake context, but don't supports switching. */
if (!HAS_HW_CONTEXTS(ring->dev))
/* We have the fake context */
if (!HAS_HW_CONTEXTS(ring->dev)) {
ring->last_context = to;
return 0;
}
return do_switch(ring, to);
}