[Intel-gfx] [PATCH v2 16/18] drm/i915: Ring Context allocating for GuC

[yu.dai at intel.com]

From: Alex Dai <yu.dai at intel.com>

GuC firmware uses the one page after Ring Context as shared data.
However, GuC uses same offset to address this page for all rings.
So we have to allocate same size of lrc context for all rings.

Also, reduce ring buffer size to 4 pages. In GuC, work queue tail is
referenced by 11 bits (WQ_RING_TAIL_MASK). It is in QW, so total 14
bits (4 pages).

Issue: VIZ-4884
Signed-off-by: Alex Dai <yu.dai at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c        | 23 ++++++++---------------
 drivers/gpu/drm/i915/intel_ringbuffer.c |  2 +-
 2 files changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index cb5a617..1948de8 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1760,20 +1760,10 @@ uint32_t get_lr_context_size(struct intel_engine_cs *ring)
 
 	WARN_ON(INTEL_INFO(ring->dev)->gen < 8);
 
-	switch (ring->id) {
-	case RCS:
-		if (INTEL_INFO(ring->dev)->gen >= 9)
-			ret = GEN9_LR_CONTEXT_RENDER_SIZE;
-		else
-			ret = GEN8_LR_CONTEXT_RENDER_SIZE;
-		break;
-	case VCS:
-	case BCS:
-	case VECS:
-	case VCS2:
-		ret = GEN8_LR_CONTEXT_OTHER_SIZE;
-		break;
-	}
+	if (INTEL_INFO(ring->dev)->gen >= 9)
+		ret = GEN9_LR_CONTEXT_RENDER_SIZE;
+	else
+		ret = GEN8_LR_CONTEXT_RENDER_SIZE;
 
 	return ret;
 }
@@ -1822,6 +1812,9 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
 	WARN_ON(ctx->engine[ring->id].state);
 
 	context_size = round_up(get_lr_context_size(ring), 4096);
+	/* One extra page as the sharing data between driver and GuC */
+	if (i915.enable_guc_scheduling)
+		context_size += PAGE_SIZE;
 
 	ctx_obj = i915_gem_alloc_context_obj(dev, context_size);
 	if (IS_ERR(ctx_obj)) {
@@ -1850,7 +1843,7 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
 
 	ringbuf->ring = ring;
 
-	ringbuf->size = 32 * PAGE_SIZE;
+	ringbuf->size = 4 * PAGE_SIZE;
 	ringbuf->effective_size = ringbuf->size;
 	ringbuf->head = 0;
 	ringbuf->tail = 0;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 44c7b99..a3873f9 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1980,7 +1980,7 @@ static int intel_init_ring_buffer(struct drm_device *dev,
 	INIT_LIST_HEAD(&ring->active_list);
 	INIT_LIST_HEAD(&ring->request_list);
 	INIT_LIST_HEAD(&ring->execlist_queue);
-	ringbuf->size = 32 * PAGE_SIZE;
+	ringbuf->size = 4 * PAGE_SIZE;
 	ringbuf->ring = ring;
 	memset(ring->semaphore.sync_seqno, 0, sizeof(ring->semaphore.sync_seqno));
 
-- 
1.9.1