linux-kernel - [PATCH 05/10] iommu/core: Use bus->iommu

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Date:	Wed, 7 Sep 2011 17:41:48 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	<iommu@...ts.linux-foundation.org>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Brown <davidb@...eaurora.org>, <joro@...tes.org>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 05/10] iommu/core: Use bus->iommu_ops in the iommu-api

Use the per-bus iommu-ops in the functions of the iommu-api
instead of the global iommu_ops.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 drivers/iommu/iommu.c |   34 +++++++++++++++++++++++++++-------
 1 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 2270127..f2ced4c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -83,34 +83,48 @@ EXPORT_SYMBOL_GPL(iommu_domain_alloc);
 
 void iommu_domain_free(struct iommu_domain *domain)
 {
-	iommu_ops->domain_destroy(domain);
+	if (likely(domain->ops->domain_destroy != NULL))
+		domain->ops->domain_destroy(domain);
+
 	kfree(domain);
 }
 EXPORT_SYMBOL_GPL(iommu_domain_free);
 
 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
 {
-	return iommu_ops->attach_dev(domain, dev);
+	if (unlikely(domain->ops->attach_dev == NULL))
+		return -ENODEV;
+
+	return domain->ops->attach_dev(domain, dev);
 }
 EXPORT_SYMBOL_GPL(iommu_attach_device);
 
 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
 {
-	iommu_ops->detach_dev(domain, dev);
+	if (unlikely(domain->ops->detach_dev == NULL))
+		return;
+
+	domain->ops->detach_dev(domain, dev);
 }
 EXPORT_SYMBOL_GPL(iommu_detach_device);
 
 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 			       unsigned long iova)
 {
-	return iommu_ops->iova_to_phys(domain, iova);
+	if (unlikely(domain->ops->iova_to_phys == NULL))
+		return 0;
+
+	return domain->ops->iova_to_phys(domain, iova);
 }
 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
 
 int iommu_domain_has_cap(struct iommu_domain *domain,
 			 unsigned long cap)
 {
-	return iommu_ops->domain_has_cap(domain, cap);
+	if (unlikely(domain->ops->domain_has_cap == NULL))
+		return 0;
+
+	return domain->ops->domain_has_cap(domain, cap);
 }
 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
 
@@ -119,11 +133,14 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
 {
 	size_t size;
 
+	if (unlikely(domain->ops->map == NULL))
+		return -ENODEV;
+
 	size         = PAGE_SIZE << gfp_order;
 
 	BUG_ON(!IS_ALIGNED(iova | paddr, size));
 
-	return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
+	return domain->ops->map(domain, iova, paddr, gfp_order, prot);
 }
 EXPORT_SYMBOL_GPL(iommu_map);
 
@@ -131,10 +148,13 @@ int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
 {
 	size_t size;
 
+	if (unlikely(domain->ops->unmap == NULL))
+		return -ENODEV;
+
 	size         = PAGE_SIZE << gfp_order;
 
 	BUG_ON(!IS_ALIGNED(iova, size));
 
-	return iommu_ops->unmap(domain, iova, gfp_order);
+	return domain->ops->unmap(domain, iova, gfp_order);
 }
 EXPORT_SYMBOL_GPL(iommu_unmap);
-- 
1.7.4.1


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