linux-kernel - [PATCH AUTOSEL for 3.18 36/63] drm/radeon: Fail fb creation from imported dma-bufs.

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Date:   Sat, 3 Mar 2018 22:33:31 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Christopher James Halse Rogers 
        <christopher.halse.rogers@...onical.com>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 3.18 36/63] drm/radeon: Fail fb creation from
 imported dma-bufs.

From: Christopher James Halse Rogers <christopher.halse.rogers@...onical.com>

[ Upstream commit a294043b2fbd8de69d161457ed0c7a4026bbfa5a ]

Any use of the framebuffer will migrate it to VRAM, which is not sensible for
an imported dma-buf.

v2: Use DRM_DEBUG_KMS to prevent userspace accidentally spamming dmesg.

Reviewed-by: Michel Dänzer <michel.daenzer@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@...onical.com>
CC: amd-gfx@...ts.freedesktop.org
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/drm/radeon/radeon_display.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 21e6e9745d00..1938de582717 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1320,6 +1320,12 @@ radeon_user_framebuffer_create(struct drm_device *dev,
 		return ERR_PTR(-ENOENT);
 	}
 
+	/* Handle is imported dma-buf, so cannot be migrated to VRAM for scanout */
+	if (obj->import_attach) {
+		DRM_DEBUG_KMS("Cannot create framebuffer from imported dma_buf\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	radeon_fb = kzalloc(sizeof(*radeon_fb), GFP_KERNEL);
 	if (radeon_fb == NULL) {
 		drm_gem_object_unreference_unlocked(obj);
-- 
2.14.1