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iommu/amd: Add amd_iommu_domain_direct_map function 

This function can be used to switch a domain into
paging-mode 0. In this mode all devices can access physical
system memory directly without any remapping.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-11-17 14:18:46 +01:00
parent 72e1dcc419
commit 132bd68f18
2 changed files with 39 additions and 2 deletions
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38
drivers/iommu/amd_iommu.c
View File

@ -1684,9 +1684,12 @@ static bool dma_ops_domain(struct protection_domain *domain)
static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
{
u64 pte_root = virt_to_phys(domain->pt_root);
u64 pte_root = 0;
u64 flags = 0;
if (domain->mode != PAGE_MODE_NONE)
pte_root = virt_to_phys(domain->pt_root);
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;
@ -2782,7 +2785,8 @@ static void amd_iommu_domain_destroy(struct iommu_domain *dom)
BUG_ON(domain->dev_cnt != 0);
free_pagetable(domain);
if (domain->mode != PAGE_MODE_NONE)
free_pagetable(domain);
protection_domain_free(domain);
@ -2846,6 +2850,9 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
int prot = 0;
int ret;
if (domain->mode == PAGE_MODE_NONE)
return -EINVAL;
if (iommu_prot & IOMMU_READ)
prot |= IOMMU_PROT_IR;
if (iommu_prot & IOMMU_WRITE)
@ -2864,6 +2871,9 @@ static int amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
struct protection_domain *domain = dom->priv;
unsigned long page_size, unmap_size;
if (domain->mode == PAGE_MODE_NONE)
return -EINVAL;
page_size = 0x1000UL << gfp_order;
mutex_lock(&domain->api_lock);
@ -2883,6 +2893,9 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
phys_addr_t paddr;
u64 *pte, __pte;
if (domain->mode == PAGE_MODE_NONE)
return iova;
pte = fetch_pte(domain, iova);
if (!pte || !IOMMU_PTE_PRESENT(*pte))
@ -2976,3 +2989,24 @@ int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
return atomic_notifier_chain_unregister(&ppr_notifier, nb);
}
EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
void amd_iommu_domain_direct_map(struct iommu_domain *dom)
{
struct protection_domain *domain = dom->priv;
unsigned long flags;
spin_lock_irqsave(&domain->lock, flags);
/* Update data structure */
domain->mode = PAGE_MODE_NONE;
domain->updated = true;
/* Make changes visible to IOMMUs */
update_domain(domain);
/* Page-table is not visible to IOMMU anymore, so free it */
free_pagetable(domain);
spin_unlock_irqrestore(&domain->lock, flags);
}
EXPORT_SYMBOL(amd_iommu_domain_direct_map);

3
drivers/iommu/amd_iommu_proto.h
View File

@ -33,9 +33,12 @@ extern void amd_iommu_init_notifier(void);
extern void amd_iommu_init_api(void);
/* IOMMUv2 specific functions */
struct iommu_domain;
extern bool amd_iommu_v2_supported(void);
extern int amd_iommu_register_ppr_notifier(struct notifier_block *nb);
extern int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb);
extern void amd_iommu_domain_direct_map(struct iommu_domain *dom);
#ifndef CONFIG_AMD_IOMMU_STATS