From 905d66c1e5dc8149e111f04a32bb193f25da1d53 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 6 Sep 2011 16:03:26 +0200
Subject: [PATCH] iommu/core: Add bus_type parameter to iommu_domain_alloc

This is necessary to store a pointer to the bus-specific
iommu_ops in the iommu-domain structure. It will be used
later to call into bus-specific iommu-ops.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 drivers/iommu/iommu.c              | 14 +++++++++++++-
 drivers/media/video/omap3isp/isp.c |  2 +-
 include/linux/iommu.h              |  6 ++++--
 virt/kvm/iommu.c                   |  2 +-
 4 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3343264f5105..46e1c24f2f43 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -16,6 +16,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
+#include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/bug.h>
 #include <linux/types.h>
@@ -71,15 +72,26 @@ bool iommu_found(void)
 }
 EXPORT_SYMBOL_GPL(iommu_found);
 
-struct iommu_domain *iommu_domain_alloc(void)
+struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 {
 	struct iommu_domain *domain;
+	struct iommu_ops *ops;
 	int ret;
 
+	if (bus->iommu_ops)
+		ops = bus->iommu_ops;
+	else
+		ops = iommu_ops;
+
+	if (ops == NULL)
+		return NULL;
+
 	domain = kmalloc(sizeof(*domain), GFP_KERNEL);
 	if (!domain)
 		return NULL;
 
+	domain->ops = ops;
+
 	ret = iommu_ops->domain_init(domain);
 	if (ret)
 		goto out_free;
diff --git a/drivers/media/video/omap3isp/isp.c b/drivers/media/video/omap3isp/isp.c
index a4baa6165c2c..a7ed98596883 100644
--- a/drivers/media/video/omap3isp/isp.c
+++ b/drivers/media/video/omap3isp/isp.c
@@ -2141,7 +2141,7 @@ static int isp_probe(struct platform_device *pdev)
 	/* to be removed once iommu migration is complete */
 	isp->iommu = to_iommu(isp->iommu_dev);
 
-	isp->domain = iommu_domain_alloc();
+	isp->domain = iommu_domain_alloc(pdev->dev.bus);
 	if (!isp->domain) {
 		dev_err(isp->dev, "can't alloc iommu domain\n");
 		ret = -ENOMEM;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index dca83d3405b1..c78d068930b7 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -25,10 +25,12 @@
 #define IOMMU_WRITE	(2)
 #define IOMMU_CACHE	(4) /* DMA cache coherency */
 
+struct iommu_ops;
 struct bus_type;
 struct device;
 
 struct iommu_domain {
+	struct iommu_ops *ops;
 	void *priv;
 };
 
@@ -55,7 +57,7 @@ struct iommu_ops {
 extern void register_iommu(struct iommu_ops *ops);
 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
 extern bool iommu_found(void);
-extern struct iommu_domain *iommu_domain_alloc(void);
+extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 extern void iommu_domain_free(struct iommu_domain *domain);
 extern int iommu_attach_device(struct iommu_domain *domain,
 			       struct device *dev);
@@ -79,7 +81,7 @@ static inline bool iommu_found(void)
 	return false;
 }
 
-static inline struct iommu_domain *iommu_domain_alloc(void)
+static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 {
 	return NULL;
 }
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 78c80f67f535..20115b1aac6a 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -233,7 +233,7 @@ int kvm_iommu_map_guest(struct kvm *kvm)
 		return -ENODEV;
 	}
 
-	kvm->arch.iommu_domain = iommu_domain_alloc();
+	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
 	if (!kvm->arch.iommu_domain)
 		return -ENOMEM;