[PATCH v2 2/2] drm/i915/gvt: Refine the combined intel_vgpu_oos_page struct to save memory

[Zhao Yakui]

The intel_vgpu_oos_page uses the combined structure, which embeds the
tracked page. As it is allocated by kmalloc, the size(4140) is aligned
to 8192. The 8192 oos_pages will waste about 32M memory.
So the tracked page is split from the intel_vgpu_oos_page. And this will
help to assure that the access of tracked page is cache aligned.

Another minor change is that it doesn't need to be cleared to zero as
it is writen firstly when one page is added to oos_page list.

Signed-off-by: Zhao Yakui <yakui.zhao at intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 7 +++++++
 drivers/gpu/drm/i915/gvt/gtt.h | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index c7103dd..9ba1ed8 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -2489,6 +2489,7 @@ static void clean_spt_oos(struct intel_gvt *gvt)
 	list_for_each_safe(pos, n, &gtt->oos_page_free_list_head) {
 		oos_page = container_of(pos, struct intel_vgpu_oos_page, list);
 		list_del(&oos_page->list);
+		free_page((unsigned long)oos_page->mem);
 		kfree(oos_page);
 	}
 }
@@ -2509,6 +2510,12 @@ static int setup_spt_oos(struct intel_gvt *gvt)
 			ret = -ENOMEM;
 			goto fail;
 		}
+		oos_page->mem = (void *)__get_free_pages(GFP_KERNEL, 0);
+		if (!oos_page->mem) {
+			ret = -ENOMEM;
+			kfree(oos_page);
+			goto fail;
+		}
 
 		INIT_LIST_HEAD(&oos_page->list);
 		INIT_LIST_HEAD(&oos_page->vm_list);
diff --git a/drivers/gpu/drm/i915/gvt/gtt.h b/drivers/gpu/drm/i915/gvt/gtt.h
index d8cb04c..e9f72a6 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.h
+++ b/drivers/gpu/drm/i915/gvt/gtt.h
@@ -221,7 +221,7 @@ struct intel_vgpu_oos_page {
 	struct list_head list;
 	struct list_head vm_list;
 	int id;
-	unsigned char mem[I915_GTT_PAGE_SIZE];
+	void *mem;
 };
 
 #define GTT_ENTRY_NUM_IN_ONE_PAGE 512
-- 
2.7.4