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drm/i915: Ignore applying the self-relocation BIAS if no relocations 

We only need to apply the BIAS for self-relocations into the batchbuffer
iff the execobject has any relocations.

This suppresses some warnings we may get with a full gtt (so the batch
object has wound up at 0 from a previous invocation), but doesn't fix
the underlying problem of how we tried to move a pinned batch vma (how
we have a pinned user vma outside of execbuf, I do not know, though this
being on an aliasing ppgtt means it could be a spurious pinning via the
global gtt). One step at a time...

References: https://bugs.freedesktop.org/show_bug.cgi?id=106744#c1
Testcase: igt/gem_exec_gttfill # byt (sporadic)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180621073205.26701-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-06-21 08:32:05 +01:00
parent 26eb4cd6c7
commit 827db9d8bb
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_gem_execbuffer.c
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@ -534,7 +534,8 @@ eb_add_vma(struct i915_execbuffer *eb,
* paranoia do it everywhere.
*/
if (i == batch_idx) {
if (!(eb->flags[i] & EXEC_OBJECT_PINNED))
if (entry->relocation_count &&
!(eb->flags[i] & EXEC_OBJECT_PINNED))
eb->flags[i] |= __EXEC_OBJECT_NEEDS_BIAS;
if (eb->reloc_cache.has_fence)
eb->flags[i] |= EXEC_OBJECT_NEEDS_FENCE;