drm/i915/guc: Add GuC ADS (Addition Data Structure) - allocation

The GuC firmware uses this for various purposes. The ADS itself is
a chunk of memory created by driver to share with GuC. Its members
are usually addresses telling where GuC to access them, including
things like scheduler policies, register list that will be saved
and restored during reset etc.

This is the first patch of a series to enable GuC ADS. For now, we
only create the ADS obj whilst keep it disabled.

v1: remove dead code checking return of kmap_atomic (Chris Wilson)
v2: use kmap instead of the atomic version of it.

Signed-off-by: Alex Dai <yu.dai@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450468812-4882-3-git-send-email-yu.dai@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 8b00f4619b1e..7e6c5272e734 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -839,6 +839,46 @@ static void guc_create_log(struct intel_guc *guc)
 	guc->log_flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
 }
 
+static void guc_create_ads(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct drm_i915_gem_object *obj;
+	struct guc_ads *ads;
+	struct intel_engine_cs *ring;
+	struct page *page;
+	u32 size, i;
+
+	/* The ads obj includes the struct itself and buffers passed to GuC */
+	size = sizeof(struct guc_ads);
+
+	obj = guc->ads_obj;
+	if (!obj) {
+		obj = gem_allocate_guc_obj(dev_priv->dev, PAGE_ALIGN(size));
+		if (!obj)
+			return;
+
+		guc->ads_obj = obj;
+	}
+
+	page = i915_gem_object_get_page(obj, 0);
+	ads = kmap(page);
+
+	/*
+	 * The GuC requires a "Golden Context" when it reinitialises
+	 * engines after a reset. Here we use the Render ring default
+	 * context, which must already exist and be pinned in the GGTT,
+	 * so its address won't change after we've told the GuC where
+	 * to find it.
+	 */
+	ring = &dev_priv->ring[RCS];
+	ads->golden_context_lrca = ring->status_page.gfx_addr;
+
+	for_each_ring(ring, dev_priv, i)
+		ads->eng_state_size[i] = intel_lr_context_size(ring);
+
+	kunmap(page);
+}
+
 /*
  * Set up the memory resources to be shared with the GuC.  At this point,
  * we require just one object that can be mapped through the GGTT.
@@ -865,6 +905,8 @@ int i915_guc_submission_init(struct drm_device *dev)
 
 	guc_create_log(guc);
 
+	guc_create_ads(guc);
+
 	return 0;
 }
 
@@ -903,6 +945,9 @@ void i915_guc_submission_fini(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_guc *guc = &dev_priv->guc;
 
+	gem_release_guc_obj(dev_priv->guc.ads_obj);
+	guc->ads_obj = NULL;
+
 	gem_release_guc_obj(dev_priv->guc.log_obj);
 	guc->log_obj = NULL;