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iommu/vt-d: Allocate dynamic domain id for virtual domains only 

Check the same domain id is allocated for si_domain on each IOMMU,
otherwise the IOTLB flush for si_domain will fail.

Now the rules to allocate and manage domain id are:
1) For normal and static identity domains, domain id is allocated
   when creating domain structure. And this id will be written into
   context entry.
2) For virtual machine domain, a virtual id is allocated when creating
   domain. And when binding virtual machine domain to an iommu, a real
   domain id is allocated on demand and this domain id will be written
   into context entry. So domain->id for virtual machine domain may be
   different from the domain id written into context entry(used by
   hardware).

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jiang Liu 2014-07-11 14:19:29 +08:00 committed by Joerg Roedel
parent fb170fb4c5
commit 44bde61428
1 changed files with 26 additions and 21 deletions
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47
drivers/iommu/intel-iommu.c
View File

@ -1549,15 +1549,27 @@ static int iommu_attach_domain(struct dmar_domain *domain,
spin_lock_irqsave(&iommu->lock, flags);
num = __iommu_attach_domain(domain, iommu);
spin_unlock_irqrestore(&iommu->lock, flags);
if (num < 0)
pr_err("IOMMU: no free domain ids\n");
else
domain->id = num;
spin_unlock_irqrestore(&iommu->lock, flags);
return num;
}
static int iommu_attach_vm_domain(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
int num;
unsigned long ndomains;
ndomains = cap_ndoms(iommu->cap);
for_each_set_bit(num, iommu->domain_ids, ndomains)
if (iommu->domains[num] == domain)
return num;
return __iommu_attach_domain(domain, iommu);
}
static void iommu_detach_domain(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
@ -1764,8 +1776,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct context_entry *context;
unsigned long flags;
struct dma_pte *pgd;
unsigned long num;
unsigned long ndomains;
int id;
int agaw;
struct device_domain_info *info = NULL;
@ -1790,20 +1800,8 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
pgd = domain->pgd;
if (domain_type_is_vm_or_si(domain)) {
int found = 0;
/* find an available domain id for this device in iommu */
ndomains = cap_ndoms(iommu->cap);
for_each_set_bit(num, iommu->domain_ids, ndomains) {
if (iommu->domains[num] == domain) {
id = num;
found = 1;
break;
}
}
if (found == 0) {
id = __iommu_attach_domain(domain, iommu);
if (domain_type_is_vm(domain)) {
id = iommu_attach_vm_domain(domain, iommu);
if (id < 0) {
spin_unlock_irqrestore(&iommu->lock, flags);
pr_err("IOMMU: no free domain ids\n");
@ -2257,8 +2255,8 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
domain = alloc_domain(0);
if (!domain)
return NULL;
if (iommu_attach_domain(domain, iommu) < 0) {
domain->id = iommu_attach_domain(domain, iommu);
if (domain->id < 0) {
free_domain_mem(domain);
return NULL;
}
@ -2428,6 +2426,7 @@ static int __init si_domain_init(int hw)
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
int nid, ret = 0;
bool first = true;
si_domain = alloc_domain(DOMAIN_FLAG_STATIC_IDENTITY);
if (!si_domain)
@ -2438,6 +2437,12 @@ static int __init si_domain_init(int hw)
if (ret < 0) {
domain_exit(si_domain);
return -EFAULT;
} else if (first) {
si_domain->id = ret;
first = false;
} else if (si_domain->id != ret) {
domain_exit(si_domain);
return -EFAULT;
}
domain_attach_iommu(si_domain, iommu);
}