drm/i915/gen8: begin bitmap tracking

Like with gen6/7, we can enable bitmap tracking with all the
preallocations to make sure things actually don't blow up.

v2: Rebased to match changes from previous patches.
v3: Without teardown logic, rely on used_pdpes and used_pdes when
freeing page tables.
v4: Rebased after s/page_tables/page_table/.
v5: Rebased after page table generalizations.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Michel Thierry <michel.thierry@intel.com> (v2+)
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index c3d5d40b78b2..29de64d1164e 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -220,11 +220,13 @@ struct i915_page_directory {
 		dma_addr_t daddr;
 	};
 
+	unsigned long *used_pdes;
 	struct i915_page_table *page_table[I915_PDES]; /* PDEs */
 };
 
 struct i915_page_directory_pointer {
 	/* struct page *page; */
+	DECLARE_BITMAP(used_pdpes, GEN8_LEGACY_PDPES);
 	struct i915_page_directory *page_directory[GEN8_LEGACY_PDPES];
 };
 
@@ -453,6 +455,11 @@ static inline uint32_t gen8_pml4e_index(uint64_t address)
 	return 0;
 }
 
+static inline size_t gen8_pte_count(uint64_t address, uint64_t length)
+{
+	return i915_pte_count(address, length, GEN8_PDE_SHIFT);
+}
+
 int i915_gem_gtt_init(struct drm_device *dev);
 void i915_gem_init_global_gtt(struct drm_device *dev);
 void i915_global_gtt_cleanup(struct drm_device *dev);