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[PATCH 05/10] vfio/type1: attach a reserved iova domain to vfio_domain

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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 <eric.auger@linaro.org>
---
 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 <alex.williamson@redhat.com>"
@@ -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

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[PATCH 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 09/10] vfio-pci: create an iommu mapping for msi address Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 01/10] iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 05/10] vfio/type1: attach a reserved iova domain to vfio_domain Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 10/10] vfio: allow the user to register reserved iova range for MSI mapping Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
    Re: [PATCH 10/10] vfio: allow the user to register reserved iova  range for MSI mapping kbuild test robot <lkp@intel.com> - 2016-01-26 17:50 +0100
    Re: [PATCH 10/10] vfio: allow the user to register reserved iova  range for MSI mapping kbuild test robot <lkp@intel.com> - 2016-01-26 19:40 +0100
  [PATCH 06/10] vfio: introduce vfio_group_alloc_map_/unmap_free_reserved_iova Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
    Re: [PATCH 06/10] vfio: introduce  vfio_group_alloc_map_/unmap_free_reserved_iova kbuild test robot <lkp@intel.com> - 2016-01-26 17:20 +0100
      Re: [PATCH 06/10] vfio: introduce  vfio_group_alloc_map_/unmap_free_reserved_iova Eric Auger <eric.auger@linaro.org> - 2016-01-26 17:40 +0100
  [PATCH 08/10] vfio: introduce vfio_group_require_msi_mapping Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 04/10] vfio: introduce VFIO_IOVA_RESERVED vfio_dma type Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 03/10] vfio_iommu_type1: add reserved binding RB tree management Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  [PATCH 02/10] vfio: expose MSI mapping requirement through VFIO_IOMMU_GET_INFO Eric Auger <eric.auger@linaro.org> - 2016-01-26 14:20 +0100
  RE: [PATCH 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 Pavel Fedin <p.fedin@samsung.com> - 2016-01-26 18:30 +0100
    Re: [PATCH 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 Eric Auger <eric.auger@linaro.org> - 2016-01-27 10:00 +0100

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