linux-kernel - [PATCH 2/4] iommu/dma: Do not init domain if broken_unmanaged

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Message-ID: <451e7beb57ec6de66ee0da5b38886105436f53d7.1674849118.git.nicolinc@nvidia.com>
Date:   Fri, 27 Jan 2023 12:04:18 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <kevin.tian@...el.com>, <robin.murphy@....com>,
        <joro@...tes.org>, <will@...nel.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <yong.wu@...iatek.com>, <matthias.bgg@...il.com>,
        <thierry.reding@...il.com>, <alex.williamson@...hat.com>,
        <cohuck@...hat.com>
CC:     <vdumpa@...dia.com>, <jonathanh@...dia.com>,
        <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: [PATCH 2/4] iommu/dma: Do not init domain if broken_unmanaged_domain

Add a sanity of the broken_unmanaged_domain flag to reject the use of
dma-iommu in the early stage, if the flag is set by the iommu driver.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/dma-iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index f798c44e0903..f1e8d952b17d 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -545,6 +545,9 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 	if (!cookie || cookie->type != IOMMU_DMA_IOVA_COOKIE)
 		return -EINVAL;
 
+	if (WARN_ON(!device_iommu_unmanaged_supported(dev)))
+		return -EINVAL;
+
 	iovad = &cookie->iovad;
 
 	/* Use the smallest supported page size for IOVA granularity */
-- 
2.39.1