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AMD IOMMU: add device reference counting for protection domains 

Impact: know how many devices are assigned to a domain

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-02 17:56:36 +01:00
parent 5b28df6f43
commit 863c74ebd0
2 changed files with 3 additions and 1 deletions
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1
arch/x86/include/asm/amd_iommu_types.h
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@ -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 */
};

3
arch/x86/kernel/amd_iommu.c
View File

@ -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;