From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 21 Jun 2018 08:32:05 +0100
Subject: drm/i915: Ignore applying the self-relocation BIAS if no relocations
Git-commit: 827db9d8bb4a01314f214065e3f18c8345c5fc9f
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
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
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -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;