linux-kernel - [PATCH] iommu/rockchip: Add missing set_platform_dma

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Message-Id: <20230315164152.333251-1-steven.price@arm.com>
Date:   Wed, 15 Mar 2023 16:41:52 +0000
From:   Steven Price <steven.price@....com>
To:     Heiko Stuebner <heiko@...ech.de>, Joerg Roedel <joro@...tes.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Jason Gunthorpe <jgg@...pe.ca>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Steven Price <steven.price@....com>
Subject: [PATCH] iommu/rockchip: Add missing set_platform_dma_ops callback

Similar to exynos, we need a set_platform_dma_ops() callback for proper
operation on ARM 32 bit after recent changes in the IOMMU framework
(detach ops removal).

Fixes: c1fe9119ee70 ("iommu: Add set_platform_dma_ops callbacks")
Signed-off-by: Steven Price <steven.price@....com>
---
This fixes a splat I was seeing on a Firefly-RK3288, more details here:
https://lore.kernel.org/all/26a5d1b8-40b3-b1e4-bc85-740409c26838@arm.com/

 drivers/iommu/rockchip-iommu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index f30db22ea5d7..312a3df19904 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1183,6 +1183,12 @@ static int rk_iommu_of_xlate(struct device *dev,
 	return 0;
 }
 
+static void rk_iommu_set_platform_dma(struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+	rk_iommu_detach_device(domain, dev);
+}
+
 static const struct iommu_ops rk_iommu_ops = {
 	.domain_alloc = rk_iommu_domain_alloc,
 	.probe_device = rk_iommu_probe_device,
@@ -1190,6 +1196,7 @@ static const struct iommu_ops rk_iommu_ops = {
 	.device_group = rk_iommu_device_group,
 	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
 	.of_xlate = rk_iommu_of_xlate,
+	.set_platform_dma_ops = rk_iommu_set_platform_dma,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= rk_iommu_attach_device,
 		.map		= rk_iommu_map,
-- 
2.34.1