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.
Signed-off-by: Bill Sumner <bill.sum...@hp.com>
---
drivers/iommu/intel-iommu.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 4116377..226c1d0 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1181,7 +1181,8 @@ static struct dmar_domain *alloc_domain(bool vm)
}
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;
@@ -1191,12 +1192,15 @@ static int iommu_attach_domain(struct dmar_domain
*domain,
spin_lock_irqsave(&iommu->lock, flags);
- num = find_first_zero_bit(iommu->domain_ids, ndomains);
- if (num >= ndomains) {
- spin_unlock_irqrestore(&iommu->lock, flags);
- printk(KERN_ERR "IOMMU: no free domain ids\n");
- return -ENOMEM;
- }
+ if (domain_number < 0) {
+ num = find_first_zero_bit(iommu->domain_ids, ndomains);
+ if (num >= ndomains) {
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ pr_err("IOMMU: no free domain ids\n");
+ return -ENOMEM;
+ }
+ } else
+ num = domain_number;
domain->id = num;
domain->iommu_count++;
@@ -1875,6 +1879,7 @@ static struct dmar_domain *get_domain_for_dev(struct
device *dev, int gaw)
struct pci_dev *dev_tmp = NULL;
unsigned long flags;
u8 bus, devfn, bridge_bus, bridge_devfn;
+ int did = -1; /* Default to "no domain_id supplied" */
domain = find_domain(dev);
if (domain)
@@ -1915,7 +1920,7 @@ static struct dmar_domain *get_domain_for_dev(struct
device *dev, int gaw)
domain = alloc_domain(false);
if (!domain)
goto error;
- if (iommu_attach_domain(domain, iommu)) {
+ if (iommu_attach_domain(domain, iommu, did)) {
free_domain_mem(domain);
domain = NULL;
goto error;
@@ -2083,7 +2088,7 @@ static int __init si_domain_init(int hw)
si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY;
for_each_active_iommu(iommu, drhd) {
- ret = iommu_attach_domain(si_domain, iommu);
+ ret = iommu_attach_domain(si_domain, iommu, (int) -1);
if (ret) {
domain_exit(si_domain);
return -EFAULT;
--
Bill Sumner <bill.sum...@hp.com>
--
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