[Intel-gfx] [PATCH v7 4/5] drm/i915: Mark shadow batch buffers as purgeable

[michael.h.nguyen at intel.com]

From: Brad Volkin <bradley.d.volkin at intel.com>

By adding a new exec_entry flag, we cleanly mark the shadow objects
as purgeable after they are on the active list.

v2:
- Move 'shadow_batch_obj->madv = I915_MADV_WILLNEED' inside _get
  fnc (danvet, from v4 6/7 feedback)

v3:
- Remove duplicate 'madv = I915_MADV_WILLNEED' (danvet, from v6 4/5)

Issue: VIZ-4719
Signed-off-by: Brad Volkin <bradley.d.volkin at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_batch_pool.c | 2 ++
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_batch_pool.c b/drivers/gpu/drm/i915/i915_gem_batch_pool.c
index 6016125..c690170 100644
--- a/drivers/gpu/drm/i915/i915_gem_batch_pool.c
+++ b/drivers/gpu/drm/i915/i915_gem_batch_pool.c
@@ -131,5 +131,7 @@ i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
 		/* Keep list in LRU order */
 		list_move_tail(&obj->batch_pool_list, &pool->cache_list);
 
+	obj->madv = I915_MADV_WILLNEED;
+
 	return obj;
 }
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index fccfff5..9af4053 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -37,6 +37,7 @@
 #define  __EXEC_OBJECT_HAS_FENCE (1<<30)
 #define  __EXEC_OBJECT_NEEDS_MAP (1<<29)
 #define  __EXEC_OBJECT_NEEDS_BIAS (1<<28)
+#define  __EXEC_OBJECT_PURGEABLE (1<<27)
 
 #define BATCH_OFFSET_BIAS (256*1024)
 
@@ -226,7 +227,12 @@ i915_gem_execbuffer_unreserve_vma(struct i915_vma *vma)
 	if (entry->flags & __EXEC_OBJECT_HAS_PIN)
 		vma->pin_count--;
 
-	entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
+	if (entry->flags & __EXEC_OBJECT_PURGEABLE)
+		obj->madv = I915_MADV_DONTNEED;
+
+	entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE |
+			  __EXEC_OBJECT_HAS_PIN |
+			  __EXEC_OBJECT_PURGEABLE);
 }
 
 static void eb_destroy(struct eb_vmas *eb)
@@ -1433,6 +1439,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 			vma = i915_gem_obj_to_ggtt(shadow_batch_obj);
 			vma->exec_entry = &shadow_exec_entry;
+			vma->exec_entry->flags = __EXEC_OBJECT_PURGEABLE;
 			drm_gem_object_reference(&shadow_batch_obj->base);
 			list_add_tail(&vma->exec_list, &eb->vmas);
 
-- 
1.9.1