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Groups > linux.kernel > #1344499

[RFC v4 02/14] iommu: introduce a reserved iova cookie

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This patch introduces some new fields in the iommu_domain struct,
dedicated to reserved iova management.

In a similar way as DMA mapping IOVA window, we need to store
information related to a reserved IOVA window.

The reserved_iova_cookie will store the reserved iova_domain
handle. An RB tree indexed by physical address is introduced to
store the host physical addresses bound to reserved IOVAs.

Those physical addresses will correspond to MSI frame base
addresses, also referred to as doorbells. Their number should be
quite limited per domain.

Also a mutex is introduced to protect accesses to the iova_domain
and RB tree.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
 drivers/iommu/iommu.c | 1 +
 include/linux/iommu.h | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0e3b009..7b2bb94 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1072,6 +1072,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
 
 	domain->ops  = bus->iommu_ops;
 	domain->type = type;
+	mutex_init(&domain->reserved_mutex);
 
 	return domain;
 }
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a4fe04a..0189144 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -82,6 +82,11 @@ struct iommu_domain {
 	void *handler_token;
 	struct iommu_domain_geometry geometry;
 	void *iova_cookie;
+	void *reserved_iova_cookie;
+	/* rb tree indexed by PA, for reserved bindings only */
+	struct rb_root reserved_binding_list;
+	/* protects reserved cookie and rbtree manipulation */
+	struct mutex reserved_mutex;
 };
 
 enum iommu_cap {
-- 
1.9.1

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[RFC v4 00/14] KVM PCIe/MSI passthrough on ARM/ARM64 Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 09/14] msi: IOMMU map the doorbell address when needed Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
    Re: [RFC v4 09/14] msi: IOMMU map the doorbell address when needed Thomas Gleixner <tglx@linutronix.de> - 2016-02-26 19:30 +0100
      Re: [RFC v4 09/14] msi: IOMMU map the doorbell address when needed Eric Auger <eric.auger@linaro.org> - 2016-02-29 16:30 +0100
  [RFC v4 12/14] vfio/type1: also check IRQ remapping capability at msi domain Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 07/14] msi: Add a new MSI_FLAG_IRQ_REMAPPING flag Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
    Re: [RFC v4 07/14] msi: Add a new MSI_FLAG_IRQ_REMAPPING flag Thomas Gleixner <tglx@linutronix.de> - 2016-02-26 19:10 +0100
      Re: [RFC v4 07/14] msi: Add a new MSI_FLAG_IRQ_REMAPPING flag Eric Auger <eric.auger@linaro.org> - 2016-02-29 16:30 +0100
  [RFC v4 02/14] iommu: introduce a reserved iova cookie Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 01/14] iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 10/14] vfio: introduce VFIO_IOVA_RESERVED vfio_dma type Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 08/14] msi: export msi_get_domain_info Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 03/14] dma-reserved-iommu: alloc/free_reserved_iova_domain Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:40 +0100
  [RFC v4 06/14] dma-reserved-iommu: iommu_unmap_reserved Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:50 +0100
  [RFC v4 05/14] dma-reserved-iommu: iommu_get/put_single_reserved Eric Auger <eric.auger@linaro.org> - 2016-02-26 18:50 +0100

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