This patch adds a reserved iova_domain to the vfio_domain struct. This iova domain will enable to allocate iova within the reserved iova region.
alloc_reserved_iova_domain makes possible to allocate and initialize this iova domain. The user will be introduced in subsequent patches. Signed-off-by: Eric Auger <[email protected]> --- drivers/vfio/vfio_iommu_type1.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 33a9ce4..33304c0 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -36,6 +36,7 @@ #include <linux/uaccess.h> #include <linux/vfio.h> #include <linux/workqueue.h> +#include <linux/iova.h> #define DRIVER_VERSION "0.2" #define DRIVER_AUTHOR "Alex Williamson <[email protected]>" @@ -77,6 +78,7 @@ struct vfio_domain { struct list_head group_list; /* rb tree indexed by PA, for reserved bindings only */ struct rb_root reserved_binding_list; + struct iova_domain *reserved_iova_domain; int prot; /* IOMMU_CACHE */ bool fgsp; /* Fine-grained super pages */ }; @@ -178,6 +180,41 @@ static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu, return NULL; } +/* alloc_reserved_iova_domain: allocate an iova domain used to manage + * reserved iova + * @iova: base iova of the domain + * @size: size of the domain + * @order: iommu page size order + */ +static int alloc_reserved_iova_domain(struct vfio_domain *domain, + dma_addr_t iova, size_t size, + unsigned long order) +{ + unsigned long granule, mask; + int ret = 0; + + granule = 1UL << order; + mask = granule - 1; + if (iova & mask) + return -EINVAL; + if ((!size) || (size & mask)) + return -EINVAL; + + domain->reserved_iova_domain = + kzalloc(sizeof(struct iova_domain), GFP_KERNEL); + if (!domain->reserved_iova_domain) { + ret = -ENOMEM; + goto out_free; + } + init_iova_domain(domain->reserved_iova_domain, + granule, iova >> order, (iova + size - 1) >> order); + return ret; + +out_free: + kfree(domain->reserved_iova_domain); + return ret; +} + static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new) { struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL; -- 1.9.1
