[PATCH v9 01/10] iommu/vt-d: New function to attach domain with id

Li, Zhen-Hua
2015-03-19T05:37:26Z

Allow specification of the domain-id for the new domain.
This patch only adds a new function iommu_attach_domain_with_id, it is like
the function iommu_attach_domain(), only adding a parameter "did".

Bill Sumner:
(In older versions) Add new 'did' parameter to iommu_attach_domain();
The caller of this function.

Li, Zhenhua:
New function iommu_attach_domain_with_id(), instead of updating funtion
iommu_attach_domain();

Signed-off-by: Bill Sumner <billsumnerlinux@gmail.com>
Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
---
drivers/iommu/intel-iommu.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index ae4c1a8..76674a1 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1558,6 +1558,16 @@ static int iommu_attach_domain(struct dmar_domain *domain,
return num;
}

+static int iommu_attach_domain_with_id(struct dmar_domain *domain,
+ struct intel_iommu *iommu,
+ int domain_number)
+{
+ if (domain_number >= 0)
+ return domain_number;
+
+ return iommu_attach_domain(domain, iommu);
+}
+
static int iommu_attach_vm_domain(struct dmar_domain *domain,
struct intel_iommu *iommu)
{
@@ -2225,6 +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)
@@ -2258,7 +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_with_id(domain, iommu, did);
if (domain->id < 0) {
free_domain_mem(domain);
return NULL;
--
2.0.0-rc0