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Subject[PATCH 4/4] iommu: Add domain window handling functions
Date
Add the iommu_domain_wnd_enable() and iommu_domain_wnd_disable()
functions to the IOMMU-API. These functions will be used to
setup domains that are based on subwindows and not on
paging.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
---
drivers/iommu/iommu.c | 20 ++++++++++++++++++++
include/linux/iommu.h | 18 ++++++++++++++++++
2 files changed, 38 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ab9dafd..55ae3bf 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -852,6 +852,26 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
}
EXPORT_SYMBOL_GPL(iommu_unmap);

+
+int iommu_domain_wnd_enable(struct iommu_domain *domain, u32 window,
+ unsigned long offset, size_t size)
+{
+ if (unlikely(domain->ops->domain_wnd_enable == NULL))
+ return -ENODEV;
+
+ return domain->ops->domain_wnd_enable(domain, window, offset, size);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_wnd_enable);
+
+void iommu_domain_wnd_disable(struct iommu_domain *domain, u32 window)
+{
+ if (unlikely(domain->ops->domain_wnd_disable == NULL))
+ return;
+
+ return domain->ops->domain_wnd_disable(domain, window);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_wnd_disable);
+
static int __init iommu_init(void)
{
iommu_group_kset = kset_create_and_add("iommu_groups",
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 26066f5..f01657e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -90,6 +90,9 @@ struct iommu_ops {
phys_addr_t paddr, size_t size, int prot);
size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
size_t size);
+ int (*domain_wnd_enable)(struct iommu_domain *domain, u32 window,
+ unsigned long offset, size_t size);
+ void (*domain_wnd_disable)(struct iommu_domain *domain, u32 window);
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
unsigned long iova);
int (*domain_has_cap)(struct iommu_domain *domain,
@@ -123,6 +126,9 @@ extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot);
extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
size_t size);
+extern int iommu_domain_wnd_enable(struct iommu_domain *domain, u32 window,
+ unsigned long offset, size_t size);
+extern void iommu_domain_wnd_disable(struct iommu_domain *domain, u32 window);
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long iova);
extern int iommu_domain_has_cap(struct iommu_domain *domain,
@@ -240,6 +246,18 @@ static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
return -ENODEV;
}

+static inline int iommu_domain_wnd_enable(struct iommu_domain *domain,
+ u32 window, unsigned long offset,
+ size_t size)
+{
+ return -ENODEV;
+}
+
+static inline void iommu_domain_wnd_disable(struct iommu_domain *domain,
+ u32 window)
+{
+}
+
static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long iova)
{
--
1.7.9.5



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