@@ -1531,31 +1531,36 @@ static struct dmar_domain *alloc_domain(int flags)
}
static int __iommu_attach_domain(struct dmar_domain *domain,
- struct intel_iommu *iommu)
+ struct intel_iommu *iommu,
+ int domain_number)
{
int num;
unsigned long ndomains;
ndomains = cap_ndoms(iommu->cap);
- num = find_first_zero_bit(iommu->domain_ids, ndomains);
- if (num < ndomains) {
- set_bit(num, iommu->domain_ids);
- iommu->domains[num] = domain;
- } else {
- num = -ENOSPC;
- }
+ if (domain_number < 0) {
+ num = find_first_zero_bit(iommu->domain_ids, ndomains);
+ if (num < ndomains) {
+ set_bit(num, iommu->domain_ids);
+ iommu->domains[num] = domain;
+ } else {
+ num = -ENOSPC;
+ }
+ } else
+ num = domain_number;
return num;
}
static int iommu_attach_domain(struct dmar_domain *domain,
- struct intel_iommu *iommu)
+ struct intel_iommu *iommu,
+ int domain_number)
{
int num;
unsigned long flags;
spin_lock_irqsave(&iommu->lock, flags);
- num = __iommu_attach_domain(domain, iommu);
+ num = __iommu_attach_domain(domain, iommu, domain_number);
spin_unlock_irqrestore(&iommu->lock, flags);
if (num < 0)
pr_err("IOMMU: no free domain ids\n");
@@ -1574,7 +1579,7 @@ static int iommu_attach_vm_domain(struct dmar_domain *domain,
if (iommu->domains[num] == domain)
return num;
- return __iommu_attach_domain(domain, iommu);
+ return __iommu_attach_domain(domain, iommu, -1);
}
static void iommu_detach_domain(struct dmar_domain *domain,
@@ -2230,6 +2235,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
u16 dma_alias;
unsigned long flags;
u8 bus, devfn;
+ int did = -1; /* Default to "no domain_id supplied" */
domain = find_domain(dev);
if (domain)
@@ -2263,7 +2269,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
domain = alloc_domain(0);
if (!domain)
return NULL;
- domain->id = iommu_attach_domain(domain, iommu);
+ domain->id = iommu_attach_domain(domain, iommu, did);
if (domain->id < 0) {
free_domain_mem(domain);
return NULL;
@@ -2441,7 +2447,7 @@ static int __init si_domain_init(int hw)
return -EFAULT;
for_each_active_iommu(iommu, drhd) {
- ret = iommu_attach_domain(si_domain, iommu);
+ ret = iommu_attach_domain(si_domain, iommu, -1);
if (ret < 0) {
domain_exit(si_domain);
return -EFAULT;
Allow specification of the domain-id for the new domain. This patch only adds the 'did' parameter to iommu_attach_domain() and modifies all of its callers to specify the default value of -1 which says "no did specified, allocate a new one". This is no functional change from current behaviour -- just enables a functional change to be made in a later patch. Bill Sumner: Original version. Li, Zhenhua: Minor change, add change to function __iommu_attach_domain. Signed-off-by: Bill Sumner Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com> --- drivers/iommu/intel-iommu.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-)