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From:   Daniel Vetter <daniel.vetter@ffwll.ch>
To:     DRI Development <dri-devel@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     kvm@vger.kernel.org, linux-mm@kvack.org,
        linux-arm-kernel@lists.infradead.org,
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        Daniel Vetter <daniel.vetter@intel.com>,
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        Inki Dae <inki.dae@samsung.com>,
        Joonyoung Shim <jy0922.shim@samsung.com>,
        Seung-Woo Kim <sw0312.kim@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        John Hubbard <jhubbard@nvidia.com>,
        =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= <jglisse@redhat.com>,
        Jan Kara <jack@suse.cz>,
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        Daniel Vetter <daniel.vetter@ffwll.com>
Subject: [PATCH v3 02/16] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists
Date:   Wed, 21 Oct 2020 10:56:41 +0200
Message-Id: <20201021085655.1192025-3-daniel.vetter@ffwll.ch>
In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch>
References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch>
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The exynos g2d interface is very unusual, but it looks like the
userptr objects are persistent. Hence they need FOLL_LONGTERM.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: linux-mm@kvack.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-media@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.com>
---
 drivers/gpu/drm/exynos/exynos_drm_g2d.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
index ecede41af9b9..1e0c5a7f206e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -475,7 +475,8 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d,
 		goto err_free;
 	}
 
-	ret = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE,
+	ret = pin_user_pages_fast(start, npages,
+				  FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM,
 				  g2d_userptr->pages);
 	if (ret != npages) {
 		DRM_DEV_ERROR(g2d->dev,
-- 
2.28.0