linux-kernel - [PATCH 4.16 272/272] drm/vmwgfx: Set dmabuf_size when vmw_dmabuf

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Date:   Mon, 28 May 2018 12:05:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Deepak Rawat <drawat@...are.com>,
        Sinclair Yeh <syeh@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>
Subject: [PATCH 4.16 272/272] drm/vmwgfx: Set dmabuf_size when vmw_dmabuf_init is successful

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Deepak Rawat <drawat@...are.com>

commit 91ba9f28a3de97761c2b5fd5df5d88421268e507 upstream.

SOU primary plane prepare_fb hook depends upon dmabuf_size to pin up BO
(and not call a new vmw_dmabuf_init) when a new fb size is same as
current fb. This was changed in a recent commit which is causing
page_flip to fail on VM with low display memory and multi-mon failure
when cycle monitors from secondary display.

Cc: <stable@...r.kernel.org> # 4.14, 4.16
Fixes: 20fb5a635a0c ("drm/vmwgfx: Unpin the screen object backup buffer when not used")
Signed-off-by: Deepak Rawat <drawat@...are.com>
Reviewed-by: Sinclair Yeh <syeh@...are.com>
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
@@ -530,6 +530,8 @@ vmw_sou_primary_plane_prepare_fb(struct
 		return ret;
 	}
 
+	vps->dmabuf_size = size;
+
 	/*
 	 * TTM already thinks the buffer is pinned, but make sure the
 	 * pin_count is upped.