[Intel-gfx] [RFC 3/6] drm/i915/guc: Add engine->resume for GuC submission

[Daniele Ceraolo Spurio]

Similar to the execlists one, but we don't handle the STOP_RING (because
GuC owns the engine status) and we leave the CSB fifo at 6 deep.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
---
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 29 +++++++++++++++++++
 1 file changed, 29 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 bf40793e32e5..c688f21cc27e 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -11,6 +11,7 @@
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_pm.h"
 #include "gt/intel_lrc_reg.h"
+#include "gt/intel_mocs.h"
 #include "gt/intel_ring.h"
 
 #include "intel_guc_submission.h"
@@ -501,6 +502,32 @@ static void guc_reset_finish(struct intel_engine_cs *engine)
 		     atomic_read(&execlists->tasklet.count));
 }
 
+static void hwsp_setup(struct intel_engine_cs *engine)
+{
+	intel_engine_set_hwsp_writemask(engine, ~0u); /* HWSTAM */
+
+	ENGINE_WRITE(engine, RING_HWS_PGA,
+		     i915_ggtt_offset(engine->status_page.vma));
+	ENGINE_POSTING_READ(engine, RING_HWS_PGA);
+}
+
+static int guc_submission_resume(struct intel_engine_cs *engine)
+{
+	intel_engine_apply_workarounds(engine);
+	intel_engine_apply_whitelist(engine);
+
+	intel_mocs_init_engine(engine);
+
+	intel_engine_reset_breadcrumbs(engine);
+
+	hwsp_setup(engine);
+
+	/* pre-gen11 requires explicit enabling of the execlists */
+	GEM_BUG_ON(INTEL_GEN(engine->i915) < 11);
+
+	return 0;
+}
+
 static int guc_submission_request_alloc(struct i915_request *request)
 {
 	int ret;
@@ -745,6 +772,8 @@ static void guc_submission_default_vfuncs(struct intel_engine_cs *engine)
 {
 	/* Default vfuncs which can be overriden by each engine. */
 
+	engine->resume = guc_submission_resume;
+
 	engine->request_alloc = guc_submission_request_alloc;
 
 	engine->emit_init_breadcrumb = emit_init_breadcrumb;
-- 
2.24.1