From: jsg <jsg@openbsd.org>
Date: Thu, 13 Sep 2018 03:55:17 +0000 (+0000)
Subject: drm/drivers: add support for using the arch wc mapping API.
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=20916ea0818c0b53d9cea1a680f1d21e84e2aa76;p=openbsd

drm/drivers: add support for using the arch wc mapping API.

From Dave Airlie
c59fdc4cfbda52ce081c59540762185d765c3369 in linux 4.4.y/4.4.155
7cf321d118a825c1541b43ca45294126fd474efa in mainline linux
---

diff --git a/sys/dev/pci/drm/radeon/radeon_object.c b/sys/dev/pci/drm/radeon/radeon_object.c
index 9b45d533ce7..d8006d66ccf 100644
--- a/sys/dev/pci/drm/radeon/radeon_object.c
+++ b/sys/dev/pci/drm/radeon/radeon_object.c
@@ -447,6 +447,12 @@ int radeon_bo_init(struct radeon_device *rdev)
 {
 	paddr_t start, end;
 
+#ifdef __linux__
+	/* reserve PAT memory space to WC for VRAM */
+	arch_io_reserve_memtype_wc(rdev->mc.aper_base,
+				   rdev->mc.aper_size);
+#endif
+
 	/* Add an MTRR for the VRAM */
 	if (!rdev->fastfb_working) {
 #ifdef __linux__
@@ -476,6 +482,7 @@ void radeon_bo_fini(struct radeon_device *rdev)
 	radeon_ttm_fini(rdev);
 #ifdef __linux__
 	arch_phys_wc_del(rdev->mc.vram_mtrr);
+	arch_io_free_memtype_wc(rdev->mc.aper_base, rdev->mc.aper_size);
 #else
 	drm_mtrr_del(0, rdev->mc.aper_base, rdev->mc.aper_size, DRM_MTRR_WC);
 #endif