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Allocation and free functions of virtual machine domain 

virtual machine domain is different from native DMA-API domain, implement separate allocation and free functions for virtual machine domain.

Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Weidong Han 2008-12-08 23:03:27 +08:00 committed by Joerg Roedel
parent 5331fe6f56
commit 5e98c4b1d6
1 changed files with 105 additions and 2 deletions
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107
drivers/pci/intel-iommu.c
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@ -1216,6 +1216,7 @@ static int iommu_init_domains(struct intel_iommu *iommu)
static void domain_exit(struct dmar_domain *domain);
static void vm_domain_exit(struct dmar_domain *domain);
void free_dmar_iommu(struct intel_iommu *iommu)
{
@ -1229,8 +1230,12 @@ void free_dmar_iommu(struct intel_iommu *iommu)
clear_bit(i, iommu->domain_ids);
spin_lock_irqsave(&domain->iommu_lock, flags);
if (--domain->iommu_count == 0)
domain_exit(domain);
if (--domain->iommu_count == 0) {
if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
vm_domain_exit(domain);
else
domain_exit(domain);
}
spin_unlock_irqrestore(&domain->iommu_lock, flags);
i = find_next_bit(iommu->domain_ids,
@ -2792,6 +2797,104 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
spin_unlock_irqrestore(&device_domain_lock, flags1);
}
/* domain id for virtual machine, it won't be set in context */
static unsigned long vm_domid;
static struct dmar_domain *iommu_alloc_vm_domain(void)
{
struct dmar_domain *domain;
domain = alloc_domain_mem();
if (!domain)
return NULL;
domain->id = vm_domid++;
memset(&domain->iommu_bmp, 0, sizeof(unsigned long));
domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
return domain;
}
static int vm_domain_init(struct dmar_domain *domain, int guest_width)
{
int adjust_width;
init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
spin_lock_init(&domain->mapping_lock);
spin_lock_init(&domain->iommu_lock);
domain_reserve_special_ranges(domain);
/* calculate AGAW */
domain->gaw = guest_width;
adjust_width = guestwidth_to_adjustwidth(guest_width);
domain->agaw = width_to_agaw(adjust_width);
INIT_LIST_HEAD(&domain->devices);
domain->iommu_count = 0;
domain->iommu_coherency = 0;
/* always allocate the top pgd */
domain->pgd = (struct dma_pte *)alloc_pgtable_page();
if (!domain->pgd)
return -ENOMEM;
domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
return 0;
}
static void iommu_free_vm_domain(struct dmar_domain *domain)
{
unsigned long flags;
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
unsigned long i;
unsigned long ndomains;
for_each_drhd_unit(drhd) {
if (drhd->ignored)
continue;
iommu = drhd->iommu;
ndomains = cap_ndoms(iommu->cap);
i = find_first_bit(iommu->domain_ids, ndomains);
for (; i < ndomains; ) {
if (iommu->domains[i] == domain) {
spin_lock_irqsave(&iommu->lock, flags);
clear_bit(i, iommu->domain_ids);
iommu->domains[i] = NULL;
spin_unlock_irqrestore(&iommu->lock, flags);
break;
}
i = find_next_bit(iommu->domain_ids, ndomains, i+1);
}
}
}
static void vm_domain_exit(struct dmar_domain *domain)
{
u64 end;
/* Domain 0 is reserved, so dont process it */
if (!domain)
return;
vm_domain_remove_all_dev_info(domain);
/* destroy iovas */
put_iova_domain(&domain->iovad);
end = DOMAIN_MAX_ADDR(domain->gaw);
end = end & (~VTD_PAGE_MASK);
/* clear ptes */
dma_pte_clear_range(domain, 0, end);
/* free page tables */
dma_pte_free_pagetable(domain, 0, end);
iommu_free_vm_domain(domain);
free_domain_mem(domain);
}
void intel_iommu_domain_exit(struct dmar_domain *domain)
{
u64 end;