[PATCH 49/55] drm/i915: Double check activity before relocations

Chris Wilson
2016-07-25T17:41:45Z

If the object is active and we need to perform a relocation upon it, we
need to take the slow relocation path. Before we do, double check the
active requests to see if they have completed.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index e1dfdbd8fc2e..9778b1bc6336 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -441,6 +441,20 @@ relocate_entry_clflush(struct drm_i915_gem_object *obj,
return 0;
}

+static bool object_is_idle(struct drm_i915_gem_object *obj)
+{
+ unsigned long active = obj->active;
+ int idx;
+
+ for_each_active(active, idx) {
+ if (!i915_gem_active_is_idle(&obj->last_read[idx],
+ &obj->base.dev->struct_mutex))
+ return false;
+ }
+
+ return true;
+}
+
static int
i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
struct eb_vmas *eb,
@@ -524,7 +538,7 @@ i915_gem_execbuffer_relocate_entry(struct drm_i915_gem_object *obj,
}

/* We can't wait for rendering with pagefaults disabled */
- if (obj->active && pagefault_disabled())
+ if (pagefault_disabled() && !object_is_idle(obj))
return -EFAULT;

if (use_cpu_reloc(obj))
--
2.8.1