[Intel-gfx] [PATCH 1/4] drm/i915: Enable WA batch buffers for Gen9

[Arun Siluvery]

This patch only enables support for Gen9, the actual WA will be
initialized in subsequent patches.

The WARN that we use to warn user if WA batch support is not available
for a particular Gen is replaced with DRM_ERROR as warning here doesn't
really add much value.

Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 41 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 23ff018..927f395 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1269,6 +1269,26 @@ static int gen8_init_perctx_bb(struct intel_engine_cs *ring,
 	return wa_ctx_end(wa_ctx, *offset = index, 1);
 }
 
+static int gen9_init_indirectctx_bb(struct intel_engine_cs *ring,
+				    struct i915_wa_ctx_bb *wa_ctx,
+				    uint32_t *const batch,
+				    uint32_t *offset)
+{
+	/* FIXME: Replace me with WA */
+	DRM_ERROR("No WA available to init in indirect ctx batch buffer");
+	return -EINVAL;
+}
+
+static int gen9_init_perctx_bb(struct intel_engine_cs *ring,
+			       struct i915_wa_ctx_bb *wa_ctx,
+			       uint32_t *const batch,
+			       uint32_t *offset)
+{
+	/* FIXME: Replace me with WA */
+	DRM_ERROR("No WA available to init in per ctx batch buffer");
+	return -EINVAL;
+}
+
 static int lrc_setup_wa_ctx_obj(struct intel_engine_cs *ring, u32 size)
 {
 	int ret;
@@ -1310,10 +1330,11 @@ static int intel_init_workaround_bb(struct intel_engine_cs *ring)
 	WARN_ON(ring->id != RCS);
 
 	/* update this when WA for higher Gen are added */
-	if (WARN(INTEL_INFO(ring->dev)->gen > 8,
-		 "WA batch buffer is not initialized for Gen%d\n",
-		 INTEL_INFO(ring->dev)->gen))
+	if (INTEL_INFO(ring->dev)->gen > 9) {
+		DRM_ERROR("WA batch buffer is not initialized for Gen%d\n",
+			  INTEL_INFO(ring->dev)->gen);
 		return 0;
+	}
 
 	/* some WA perform writes to scratch page, ensure it is valid */
 	if (ring->scratch.obj == NULL) {
@@ -1345,6 +1366,20 @@ static int intel_init_workaround_bb(struct intel_engine_cs *ring)
 					  &offset);
 		if (ret)
 			goto out;
+	} else if (INTEL_INFO(ring->dev)->gen == 9) {
+		ret = gen9_init_indirectctx_bb(ring,
+					       &wa_ctx->indirect_ctx,
+					       batch,
+					       &offset);
+		if (ret)
+			goto out;
+
+		ret = gen9_init_perctx_bb(ring,
+					  &wa_ctx->per_ctx,
+					  batch,
+					  &offset);
+		if (ret)
+			goto out;
 	}
 
 out:
-- 
1.9.1