From: John Harrison <john.c.harri...@intel.com>
Start of explicit request management in the execbuffer code path. This patch
adds a call to allocate a request structure before all the actual hardware work
is done. Thus guaranteeing that all that work is tagged by a known request. At
present, nothing further is done with the request, the rest comes later in the
series.
The only noticable change is that failure to get a request (e.g. due to lack of
memory) will be caught earlier in the sequence. It now occurs right at the start
before any un-undoable work has been done.
v2: Simplified the error handling path.
For: VIZ-5115
Signed-off-by: John Harrison <john.c.harri...@intel.com>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 1bb237c..2504cfd 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1594,10 +1594,16 @@ i915_gem_do_execbuffer(struct drm_device *dev, void
*data,
} else
exec_start += i915_gem_obj_offset(batch_obj, vm);
+ /* Allocate a request for this batch buffer nice and early. */
+ ret = i915_gem_request_alloc(ring, ctx);
+ if (ret)
+ goto err_batch_unpin;
+
ret = dev_priv->gt.execbuf_submit(dev, file, ring, ctx, args,
&eb->vmas, batch_obj, exec_start,
dispatch_flags);
+err_batch_unpin:
/*
* FIXME: We crucially rely upon the active tracking for the (ppgtt)
* batch vma for correctness. For less ugly and less fragility this
@@ -1606,6 +1612,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
*/
if (dispatch_flags & I915_DISPATCH_SECURE)
i915_gem_object_ggtt_unpin(batch_obj);
+
err:
/* the request owns the ref now */
i915_gem_context_unreference(ctx);
--
1.7.9.5
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