[PATCH] drm/amdgpu: Do not evict VRAM on APUs with disabled HIBERNATE

[Paul Menzel]

From: Paul Menzel <pmenzel at molgen.mpg.de>
Date: Wed, 25 Jul 2018 12:54:19 +0200

Improve commit d796d844 (drm/radeon/kms: make hibernate work on IGPs) to
only migrate VRAM objects if the Linux kernel is actually built with
support for hibernation (suspend to disk).

The better solution is to get the information, if this is suspend or
hibernate, from `amdgpu_device_suspend()`, but that’s more involved, so
apply the simple solution first.

Link: https://bugs.freedesktop.org/show_bug.cgi?id=107277
Cc: stable at vger.kernel.org
Signed-off-by: Paul Menzel <pmenzel at molgen.mpg.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 3526efa8960e..a27a62980bb7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -811,10 +811,12 @@ int amdgpu_bo_unpin(struct amdgpu_bo *bo)
 int amdgpu_bo_evict_vram(struct amdgpu_device *adev)
 {
 	/* late 2.6.33 fix IGP hibernate - we need pm ops to do this correct */
-	if (0 && (adev->flags & AMD_IS_APU)) {
+#ifndef CONFIG_HIBERNATION
+	if (adev->flags & AMD_IS_APU) {
 		/* Useless to evict on IGP chips */
 		return 0;
 	}
+#endif
 	return ttm_bo_evict_mm(&adev->mman.bdev, TTM_PL_VRAM);
 }
 
-- 
2.17.1

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