[PATCH 23/31] drm/i915/gtt: Markup i915_ppgtt height

[Chris Wilson]

This will be useful to consolidate recursive code.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 2 ++
 drivers/gpu/drm/i915/i915_gem_gtt.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 91738c6dd98d..ecdf2b2ce753 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1598,6 +1598,7 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
 		return ERR_PTR(-ENOMEM);
 
 	ppgtt_init(ppgtt, &i915->gt);
+	ppgtt->vm.top = i915_vm_is_4lvl(&ppgtt->vm) ? 3 : 2;
 
 	/*
 	 * From bdw, there is hw support for read-only pages in the PPGTT.
@@ -2083,6 +2084,7 @@ static struct i915_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
 		return ERR_PTR(-ENOMEM);
 
 	ppgtt_init(&ppgtt->base, &i915->gt);
+	ppgtt->base.vm.top = 1;
 
 	ppgtt->base.vm.allocate_va_range = gen6_alloc_va_range;
 	ppgtt->base.vm.clear_range = gen6_ppgtt_clear_range;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 48bb8c5125e3..36162bb7561b 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -323,6 +323,7 @@ struct i915_address_space {
 	struct i915_page_dma scratch_pt;
 	struct i915_page_dma scratch_pd;
 	struct i915_page_dma scratch_pdp; /* GEN8+ & 48b PPGTT */
+	unsigned int top;
 
 	/**
 	 * List of vma currently bound.
-- 
2.22.0