[PATCH 2/4] drm/i915/gem: Sync the vmap PTEs upon construction

[Chris Wilson <chris@chris-wilson.co.uk>]

Since synchronising the PTE after assignment is a manual step, use the
newly exported interface to flush the PTE after assigning via
alloc_vm_area().

Reported-by: Pavel Machek <pavel@ucw.cz>
References: 2ba3e6947aed ("mm/vmalloc: track which page-table levels were modified")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: <stable@vger.kernel.org> # v5.8+
---
 drivers/gpu/drm/i915/gem/i915_gem_pages.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 7050519c87a4..0fee67f34d74 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -304,6 +304,7 @@ static void *i915_gem_object_map(struct drm_i915_gem_object *obj,
 		for_each_sgt_daddr(addr, iter, sgt)
 			**ptes++ = iomap_pte(iomap, addr, pgprot);
 	}
+	flush_vm_area(area);
 
 	if (mem != stack)
 		kvfree(mem);
-- 
2.20.1