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Subject[PATCH 2/4] iommu/dma: Do not init domain if broken_unmanaged_domain
Date
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@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.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
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