[PATCH v10 05/19] vfio iommu: Added pin and unpin callback functions to vfio_iommu_driver_ops

[Kirti Wankhede]

Added two new callback functions to struct vfio_iommu_driver_ops. Backend
IOMMU module that supports pining and unpinning pages for mdev devices
should provide these functions.
Added APIs for pining and unpining pages to VFIO module. These calls back
into backend iommu module to actually pin and unpin pages.

Signed-off-by: Kirti Wankhede <kwankhede@xxxxxxxxxx>
Signed-off-by: Neo Jia <cjia@xxxxxxxxxx>
Change-Id: Ia7417723aaae86bec2959ad9ae6c2915ddd340e0
---
 drivers/vfio/vfio.c  | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/vfio.h | 12 ++++++-
 2 files changed, 103 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 2e83bdf007fe..28b50ca14c52 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1799,6 +1799,98 @@ void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset)
 }
 EXPORT_SYMBOL_GPL(vfio_info_cap_shift);
 
+
+/*
+ * Pin a set of guest PFNs and return their associated host PFNs for local
+ * domain only.
+ * @dev [in] : device
+ * @user_pfn [in]: array of user/guest PFNs
+ * @npage [in]: count of array elements
+ * @prot [in] : protection flags
+ * @phys_pfn[out] : array of host PFNs
+ */
+long vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
+		    long npage, int prot, unsigned long *phys_pfn)
+{
+	struct vfio_container *container;
+	struct vfio_group *group;
+	struct vfio_iommu_driver *driver;
+	ssize_t ret;
+
+	if (!dev || !user_pfn || !phys_pfn)
+		return -EINVAL;
+
+	group = vfio_group_get_from_dev(dev);
+	if (IS_ERR(group))
+		return PTR_ERR(group);
+
+	ret = vfio_group_add_container_user(group);
+	if (ret)
+		goto err_pin_pages;
+
+	container = group->container;
+	down_read(&container->group_lock);
+
+	driver = container->iommu_driver;
+	if (likely(driver && driver->ops->pin_pages))
+		ret = driver->ops->pin_pages(container->iommu_data, user_pfn,
+					     npage, prot, phys_pfn);
+	else
+		ret = -EINVAL;
+
+	up_read(&container->group_lock);
+	vfio_group_try_dissolve_container(group);
+
+err_pin_pages:
+	vfio_group_put(group);
+	return ret;
+
+}
+EXPORT_SYMBOL(vfio_pin_pages);
+
+/*
+ * Unpin set of host PFNs for local domain only.
+ * @dev [in] : device
+ * @pfn [in] : array of host PFNs to be unpinned.
+ * @npage [in] :count of elements in array, that is number of pages.
+ */
+long vfio_unpin_pages(struct device *dev, unsigned long *pfn, long npage)
+{
+	struct vfio_container *container;
+	struct vfio_group *group;
+	struct vfio_iommu_driver *driver;
+	ssize_t ret;
+
+	if (!dev || !pfn)
+		return -EINVAL;
+
+	group = vfio_group_get_from_dev(dev);
+	if (IS_ERR(group))
+		return PTR_ERR(group);
+
+	ret = vfio_group_add_container_user(group);
+	if (ret)
+		goto err_unpin_pages;
+
+	container = group->container;
+	down_read(&container->group_lock);
+
+	driver = container->iommu_driver;
+	if (likely(driver && driver->ops->unpin_pages))
+		ret = driver->ops->unpin_pages(container->iommu_data, pfn,
+					       npage);
+	else
+		ret = -EINVAL;
+
+	up_read(&container->group_lock);
+	vfio_group_try_dissolve_container(group);
+
+err_unpin_pages:
+	vfio_group_put(group);
+	return ret;
+}
+EXPORT_SYMBOL(vfio_unpin_pages);
+
 /**
  * Module/class support
  */
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 0ecae0b1cd34..0609a2052846 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -75,7 +75,11 @@ struct vfio_iommu_driver_ops {
 					struct iommu_group *group);
 	void		(*detach_group)(void *iommu_data,
 					struct iommu_group *group);
-
+	long		(*pin_pages)(void *iommu_data, unsigned long *user_pfn,
+				     long npage, int prot,
+				     unsigned long *phys_pfn);
+	long		(*unpin_pages)(void *iommu_data, unsigned long *pfn,
+				       long npage);
 };
 
 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
@@ -127,6 +131,12 @@ static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
 }
 #endif /* CONFIG_EEH */
 
+extern long vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
+			   long npage, int prot, unsigned long *phys_pfn);
+
+extern long vfio_unpin_pages(struct device *dev, unsigned long *pfn,
+			     long npage);
+
 /*
  * IRQfd - generic
  */
-- 
2.7.0