linux-kernel - [PATCH v11 01/10] iommu/vt-d: New function to attach domain with id

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Date:	Mon, 11 May 2015 17:52:45 +0800
From:	"Li, Zhen-Hua" <zhen-hual@...com>
To:	<dwmw2@...radead.org>, <indou.takao@...fujitsu.com>,
	<bhe@...hat.com>, <joro@...tes.org>, <vgoyal@...hat.com>,
	<dyoung@...hat.com>
Cc:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <kexec@...ts.infradead.org>,
	<alex.williamson@...hat.com>, <ddutile@...hat.com>,
	<ishii.hironobu@...fujitsu.com>, <bhelgaas@...gle.com>,
	<doug.hatch@...com>, <jerry.hoemann@...com>, <tom.vaden@...com>,
	<li.zhang6@...com>, <lisa.mitchell@...com>,
	<billsumnerlinux@...il.com>, <zhen-hual@...com>, <rwright@...com>
Subject: [PATCH v11 01/10] iommu/vt-d: New function to attach domain with id

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 function
    iommu_attach_domain();

Signed-off-by: Bill Sumner <billsumnerlinux@...il.com>
Signed-off-by: Li, Zhen-Hua <zhen-hual@...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 68d43be..cb9d6cc 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1552,6 +1552,16 @@ 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)
 {
@@ -2220,6 +2230,7 @@ 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)
@@ -2253,7 +2264,7 @@ 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

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