From 823cdec7bb72a1b2cafac467c2e1ff9a004dc4fc Mon Sep 17 00:00:00 2001
From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Wed, 6 Dec 2017 02:06:14 +0000
Subject: [PATCH] Allow custom overrides of mmap attribute for VT framebuffer

Summary:
As in /dev/fb, allow the framebuffer driver to override the default memattr for
mmap(2).  This is analogous to the change in 306555.

Reviewed By: ray
Differential Revision: https://reviews.freebsd.org/D13331
---
 sys/dev/vt/hw/fb/vt_fb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/dev/vt/hw/fb/vt_fb.c b/sys/dev/vt/hw/fb/vt_fb.c
index 6145940b247..f437b8cf9e7 100644
--- a/sys/dev/vt/hw/fb/vt_fb.c
+++ b/sys/dev/vt/hw/fb/vt_fb.c
@@ -143,8 +143,11 @@ vt_fb_mmap(struct vt_device *vd, vm_ooffset_t offset, vm_paddr_t *paddr,
 			*paddr = vtophys((uint8_t *)info->fb_vbase + offset);
 		} else {
 			*paddr = info->fb_pbase + offset;
+			if (info->fb_flags & FB_FLAG_MEMATTR)
+				*memattr = info->fb_memattr;
 #ifdef VM_MEMATTR_WRITE_COMBINING
-			*memattr = VM_MEMATTR_WRITE_COMBINING;
+			else
+				*memattr = VM_MEMATTR_WRITE_COMBINING;
 #endif
 		}
 		return (0);