From 6a516e30da1feba345a1ad2e9e8438b26354d538 Mon Sep 17 00:00:00 2001
From: Nirmoy Das <nirmoy.aiemd@gmail.com>
Date: Wed, 24 Jun 2020 20:26:46 +0200
Subject: drm/vram-helper: don't use ttm bo->offset v4
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: 46642a7d4d80588c1f50d06885386f0c2e00fe36
Patch-mainline: v5.9-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

Calculate GEM VRAM bo's offset within vram-helper without depending on
bo->offset.

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/372938/
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/drm_gem_vram_helper.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 0023ce1d2cf7..ad096600d89f 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -281,6 +281,15 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo)
 }
 EXPORT_SYMBOL(drm_gem_vram_mmap_offset);
 
+static u64 drm_gem_vram_pg_offset(struct drm_gem_vram_object *gbo)
+{
+	/* Keep TTM behavior for now, remove when drivers are audited */
+	if (WARN_ON_ONCE(!gbo->bo.mem.mm_node))
+		return 0;
+
+	return gbo->bo.mem.start;
+}
+
 /**
  * drm_gem_vram_offset() - \
 	Returns a GEM VRAM object's offset in video memory
@@ -297,7 +306,7 @@ s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
 {
 	if (WARN_ON_ONCE(!gbo->pin_count))
 		return (s64)-ENODEV;
-	return gbo->bo.offset;
+	return drm_gem_vram_pg_offset(gbo) << PAGE_SHIFT;
 }
 EXPORT_SYMBOL(drm_gem_vram_offset);
 
-- 
2.29.2