A straight copy of the execlists one to begin with. Tweaks will come
later if needed.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: John Harrison <John.C.Harrison@xxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
---
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 35 +++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index a4caa0f9dfbf..bf40793e32e5 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -18,6 +18,9 @@
#include "i915_drv.h"
#include "i915_trace.h"
+/* Typical size of the average request (2 pipecontrols and a MI_BB) */
+#define GUC_REQUEST_SIZE 64 /* bytes */
+
/**
* DOC: GuC-based command submission
*
@@ -498,6 +501,36 @@ static void guc_reset_finish(struct intel_engine_cs *engine)
atomic_read(&execlists->tasklet.count));
}
+static int guc_submission_request_alloc(struct i915_request *request)
+{
+ int ret;
+
+ GEM_BUG_ON(!intel_context_is_pinned(request->context));
+
+ /*
+ * Flush enough space to reduce the likelihood of waiting after
+ * we start building the request - in which case we will just
+ * have to repeat work.
+ */
+ request->reserved_space += GUC_REQUEST_SIZE;
+
+ /*
+ * Note that after this point, we have committed to using
+ * this request as it is being used to both track the
+ * state of engine initialisation and liveness of the
+ * golden renderstate above. Think twice before you try
+ * to cancel/unwind this request now.
+ */
+
+ /* Unconditionally invalidate GPU caches and TLBs. */
+ ret = request->engine->emit_flush(request, EMIT_INVALIDATE);
+ if (ret)
+ return ret;
+
+ request->reserved_space -= GUC_REQUEST_SIZE;
+ return 0;
+}
+
static int emit_init_breadcrumb(struct i915_request *rq)
{
u32 *cs;
@@ -712,6 +745,8 @@ static void guc_submission_default_vfuncs(struct intel_engine_cs *engine)
{
/* Default vfuncs which can be overriden by each engine. */
+ engine->request_alloc = guc_submission_request_alloc;
+
engine->emit_init_breadcrumb = emit_init_breadcrumb;
engine->emit_fini_breadcrumb = emit_fini_breadcrumb_xcs;
--
2.24.1
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