From: Mark Yao <mark.yao@rock-chips.com>
Date: Tue, 6 Jun 2017 06:14:08 +0000 (+0800)
Subject: drm/rockchip: limit gem buffer to 32bit mapping
X-Git-Tag: release-20171130_firefly~4^2~422
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=333b831b9eb5eb96dcf89da839b6607aa98120f5;p=firefly-linux-kernel-4.4.55.git

drm/rockchip: limit gem buffer to 32bit mapping

Change-Id: I64537668aa10a2e26bdd19ac79bc417aa6c4a437
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index 12bc70d44257..3a26e9a0f68d 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -24,6 +24,7 @@
 #include <linux/dma-buf.h>
 #include <linux/reservation.h>
 #include <linux/iommu.h>
+#include <linux/pagemap.h>
 
 #include "rockchip_drm_drv.h"
 #include "rockchip_drm_gem.h"
@@ -432,6 +433,7 @@ int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 static struct rockchip_gem_object *
 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
 {
+	struct address_space *mapping;
 	struct rockchip_gem_object *rk_obj;
 	struct drm_gem_object *obj;
 
@@ -445,6 +447,9 @@ rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
 
 	drm_gem_object_init(drm, obj, size);
 
+	mapping = file_inode(obj->filp)->i_mapping;
+	mapping_set_gfp_mask(mapping, mapping_gfp_mask(mapping) | __GFP_DMA32);
+
 	return rk_obj;
 }