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Subject[PATCH 18/21] AMD IOMMU: add domain map function for IOMMU API
Date
Impact: add a generic function to map pages into protection domains

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 97eb60d..511f782 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1635,3 +1635,31 @@ static int amd_iommu_attach_device(struct iommu_domain *dom,
return 0;
}

+static int amd_iommu_map_range(struct iommu_domain *dom,
+ unsigned long iova, phys_addr_t paddr,
+ size_t size, int iommu_prot)
+{
+ struct protection_domain *domain = dom->priv;
+ unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE);
+ int prot = 0;
+ int ret;
+
+ if (iommu_prot & IOMMU_READ)
+ prot |= IOMMU_PROT_IR;
+ if (iommu_prot & IOMMU_WRITE)
+ prot |= IOMMU_PROT_IW;
+
+ iova &= PAGE_MASK;
+ paddr &= PAGE_MASK;
+
+ for (i = 0; i < npages; ++i) {
+ ret = iommu_map_page(domain, iova, paddr, prot);
+ if (ret)
+ return ret;
+
+ iova += PAGE_SIZE;
+ paddr += PAGE_SIZE;
+ }
+
+ return 0;
+}
--
1.5.6.4



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