linux-kernel - [PATCH v6 02/17] drm/exynos: Use FOLL

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Date:   Thu, 19 Nov 2020 15:41:31 +0100
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     kvm@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-media@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        John Hubbard <jhubbard@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH v6 02/17] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists

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@...el.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Inki Dae <inki.dae@...sung.com>
Cc: Joonyoung Shim <jy0922.shim@...sung.com>
Cc: Seung-Woo Kim <sw0312.kim@...sung.com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Kukjin Kim <kgene@...nel.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Jérôme Glisse <jglisse@...hat.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: linux-mm@...ck.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-samsung-soc@...r.kernel.org
Cc: linux-media@...r.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
---
 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,
-- 
2.29.2