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[RFC PATCH 0/6] iommu/arm-smmu: Add support for DMA domains and instruction fetch

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  [RFC PATCH 0/6] iommu/arm-smmu: Add support for DMA domains and instruction fetch Anup Patel <anup.patel@broadcom.com> - 2016-01-27 06:30 +0100
    [RFC PATCH 3/6] of: iommu: Increment DT node refcount in of_iommu_set_ops() Anup Patel <anup.patel@broadcom.com> - 2016-01-27 06:30 +0100

#1318669 — [RFC PATCH 0/6] iommu/arm-smmu: Add support for DMA domains and instruction fetch

This patchset adds following to SMMUv1/SMMUv2 driver:
1. Support for domain type IOMMU_DOMAIN_DMA
2. Allow privilege instruction fetchs from MMU masters by having
a DT option to treat instruction fetch as data read

The patchset is based on '4.5-rc1' tag of linux mainline tree
and is available in smmu_v1 branch of
https://github.com/Broadcom/arm64-linux.git

All patches have been tested on Broadcom SoCs having SMMU-500.

Anup Patel (5):
  iommu/arm-smmu: Invoke DT probe from arm_smmu_of_setup()
  of: iommu: Increment DT node refcount in of_iommu_set_ops()
  iommu/arm-smmu: Add support for IOMMU_DOMAIN_DMA in SMMUv1/SMMUv2
    driver
  iommu/arm-smmu: Option to treat instruction fetch as data read for
    SMMUv2
  iommu/arm-smmu: Update bindings document for smmu-inst-as-data DT
    option

Sricharan R (1):
  iommu/arm-smmu: Init driver using IOMMU_OF_DECLARE

 .../devicetree/bindings/iommu/arm,smmu.txt         |  8 +++
 drivers/iommu/arm-smmu.c                           | 70 +++++++++++++++++-----
 drivers/iommu/of_iommu.c                           |  1 +
 3 files changed, 65 insertions(+), 14 deletions(-)

-- 
1.9.1

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#1318672 — [RFC PATCH 3/6] of: iommu: Increment DT node refcount in of_iommu_set_ops()

We are saving pointer to iommu DT node in of_iommu_set_ops()
hence we should increment DT node ref count.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
 drivers/iommu/of_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 60ba238..5fea665 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -110,6 +110,7 @@ void of_iommu_set_ops(struct device_node *np, struct iommu_ops *ops)
 	if (WARN_ON(!iommu))
 		return;
 
+	of_node_get(np);
 	INIT_LIST_HEAD(&iommu->list);
 	iommu->np = np;
 	iommu->ops = ops;
-- 
1.9.1

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