From: Joerg Roedel Date: Tue, 2 Dec 2008 16:56:36 +0000 (+0100) Subject: AMD IOMMU: add device reference counting for protection domains X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=863c74ebd0152b21bc4b11c1447b5d1429287d37;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git AMD IOMMU: add device reference counting for protection domains Impact: know how many devices are assigned to a domain Signed-off-by: Joerg Roedel --- diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h index 4862a5be899c..1c769f4e6cdf 100644 --- a/arch/x86/include/asm/amd_iommu_types.h +++ b/arch/x86/include/asm/amd_iommu_types.h @@ -203,6 +203,7 @@ struct protection_domain { int mode; /* paging mode (0-6 levels) */ u64 *pt_root; /* page table root pointer */ unsigned long flags; /* flags to find out type of domain */ + unsigned dev_cnt; /* devices assigned to this domain */ void *priv; /* private data */ }; diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 5c465c91150e..8b45bc49d1c5 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -825,9 +825,10 @@ static void set_device_domain(struct amd_iommu *iommu, u16 devid) { unsigned long flags; - u64 pte_root = virt_to_phys(domain->pt_root); + domain->dev_cnt += 1; + pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) << DEV_ENTRY_MODE_SHIFT; pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;