PIPE_CONTROL on snb needs global gtt mappings in place to workaround a
hw gotcha. No other commands need such a workaround. Luckily we can
detect a PIPE_CONTROL commands easily because they have a write_domain
= I915_GEM_DOMAIN_INSTRUCTION (and nothing else has that).
v2: Binding the target of such a reloc into the global gtt actually
works instead of binding the source, which is rather pointless ...
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 962def5..1e710ae 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -278,6 +278,7 @@ i915_gem_execbuffer_relocate_entry(struct
drm_i915_gem_object *obj,
{
struct drm_device *dev = obj->base.dev;
struct drm_gem_object *target_obj;
+ struct drm_i915_gem_object *target_i915_obj;
uint32_t target_offset;
int ret = -EINVAL;
@@ -286,7 +287,8 @@ i915_gem_execbuffer_relocate_entry(struct
drm_i915_gem_object *obj,
if (unlikely(target_obj == NULL))
return -ENOENT;
- target_offset = to_intel_bo(target_obj)->gtt_offset;
+ target_i915_obj = to_intel_bo(target_obj);
+ target_offset = target_i915_obj->gtt_offset;
/* The target buffer should have appeared before us in the
* exec_object list, so it should have a GTT space bound by now.
@@ -388,6 +390,17 @@ i915_gem_execbuffer_relocate_entry(struct
drm_i915_gem_object *obj,
io_mapping_unmap_atomic(reloc_page);
}
+ /* Sandybridge PPGTT errata: We need a global gtt mapping for MI and
+ * pipe_control writes because the gpu doesn't properly redirect them
+ * through the ppgtt for non_secure batchbuffers. */
+ if (unlikely(IS_GEN6(dev) &&
+ reloc->write_domain == I915_GEM_DOMAIN_INSTRUCTION &&
+ !target_i915_obj->has_global_gtt_mapping)) {
+ i915_gem_gtt_bind_object(target_i915_obj,
+ target_i915_obj->cache_level);
+ target_i915_obj->has_global_gtt_mapping = 1;
+ }
+
/* and update the user's relocation entry */
reloc->presumed_offset = target_offset;
--
1.7.6.4
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