[PATCH v3 15/20] iommu/s390: Add set_platform_dma callback

From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>,
	Christoph Hellwig <hch@infradead.org>,
	Kevin Tian <kevin.tian@intel.com>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
	Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>,
	Rob Clark <robdclark@gmail.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Yong Wu <yong.wu@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Heiko Stuebner <heiko@sntech.de>,
	Matthew Rosato <mjrosato@linux.ibm.com>,
	Orson Zhai <orsonzhai@gmail.com>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	Chunyan Zhang <zhang.lyra@gmail.com>,
	Chen-Yu Tsai <wens@csie.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	Lu Baolu <baolu.lu@linux.intel.com>
Subject: [PATCH v3 15/20] iommu/s390: Add set_platform_dma callback
Date: Mon, 28 Nov 2022 14:46:43 +0800	[thread overview]
Message-ID: <20221128064648.1934720-16-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20221128064648.1934720-1-baolu.lu@linux.intel.com>

This IOMMU driver doesn't support default domain. Add the implementation
of set_platform_dma callback so that the IOMMU core could return the
DMA control.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/s390-iommu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index ed33c6cce083..507bbc2c9b58 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -179,6 +179,14 @@ static void s390_iommu_get_resv_regions(struct device *dev,
 	}
 }
 
+static void s390_iommu_set_platform_dma(struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+
+	if (domain)
+		s390_iommu_detach_device(domain, dev);
+}
+
 static struct iommu_device *s390_iommu_probe_device(struct device *dev)
 {
 	struct zpci_dev *zdev;
@@ -435,6 +443,7 @@ static const struct iommu_ops s390_iommu_ops = {
 	.probe_device = s390_iommu_probe_device,
 	.release_device = s390_iommu_release_device,
 	.device_group = generic_device_group,
+	.set_platform_dma = s390_iommu_set_platform_dma,
 	.pgsize_bitmap = SZ_4K,
 	.get_resv_regions = s390_iommu_get_resv_regions,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-- 
2.34.1

