linux-kernel - [PATCH 09/13] drm/rockchip: Use sychronized interface of the IOMMU-API

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Message-Id: <1502974596-23835-10-git-send-email-joro@8bytes.org>
Date:   Thu, 17 Aug 2017 14:56:32 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Mark Yao <mark.yao@...k-chips.com>,
        David Airlie <airlied@...ux.ie>,
        Heiko Stuebner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH 09/13] drm/rockchip: Use sychronized interface of the IOMMU-API

From: Joerg Roedel <jroedel@...e.de>

The map and unmap functions of the IOMMU-API changed their
semantics: They do no longer guarantee that the hardware
TLBs are synchronized with the page-table updates they made.

To make conversion easier, new synchronized functions have
been introduced which give these guarantees again until the
code is converted to use the new TLB-flush interface of the
IOMMU-API, which allows certain optimizations.

But for now, just convert this code to use the synchronized
functions so that it will behave as before.

Cc: Mark Yao <mark.yao@...k-chips.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Heiko Stuebner <heiko@...ech.de>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-rockchip@...ts.infradead.org
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index b74ac71..6d28224 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -41,8 +41,8 @@ static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
 
 	rk_obj->dma_addr = rk_obj->mm.start;
 
-	ret = iommu_map_sg(private->domain, rk_obj->dma_addr, rk_obj->sgt->sgl,
-			   rk_obj->sgt->nents, prot);
+	ret = iommu_map_sg_sync(private->domain, rk_obj->dma_addr,
+				rk_obj->sgt->sgl, rk_obj->sgt->nents, prot);
 	if (ret < rk_obj->base.size) {
 		DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
 			  ret, rk_obj->base.size);
@@ -67,7 +67,7 @@ static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
 	struct drm_device *drm = rk_obj->base.dev;
 	struct rockchip_drm_private *private = drm->dev_private;
 
-	iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
+	iommu_unmap_sync(private->domain, rk_obj->dma_addr, rk_obj->size);
 
 	mutex_lock(&private->mm_lock);
 
-- 
2.7.4