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

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Date:   Fri, 21 Aug 2020 09:50:09 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org
Cc:     linux-mm@...ck.org, Chris Wilson <chris@...is-wilson.co.uk>,
        Pavel Machek <pavel@....cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Airlie <airlied@...hat.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>, stable@...r.kernel.org
Subject: [PATCH 2/4] drm/i915/gem: Sync the vmap PTEs upon construction

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@....cz>
References: 2ba3e6947aed ("mm/vmalloc: track which page-table levels were modified")
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Joerg Roedel <jroedel@...e.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc: Pavel Machek <pavel@....cz>
Cc: <stable@...r.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