linux-kernel - [RFC PATCH 07/11] drivers: iommu: arm-smmu: allow ACPI based streamid translation

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Date:	Thu, 14 Apr 2016 18:25:39 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	iommu@...ts.linux-foundation.org
Cc:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Will Deacon <will.deacon@....com>,
	Robin Murphy <robin.murphy@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Joerg Roedel <joro@...tes.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Tomasz Nowicki <tn@...ihalf.com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Jon Masters <jcm@...hat.com>,
	Sinan Kaya <okaya@...eaurora.org>, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH 07/11] drivers: iommu: arm-smmu: allow ACPI based streamid translation

The ACPI IORT table provides data to ARM IOMMU drivers to carry out
streamid mappings and the kernel has the infrastructure to implement
it through the fw_xlate() struct iommu_ops hook.

By relying on the DT agnostic struct iommu_fwspec fields, this
patch adds code in the ARM SMMU fw_xlate() callback that allows
streamid translation on ACPI based ARM system.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/arm-smmu.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 84bcff7..0f1e784 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1440,6 +1440,20 @@ out_unlock:
 	return ret;
 }
 
+static int arm_smmu_dev_node_match(struct device *dev, void *data)
+{
+	return is_fwnode_iommu(dev->fwnode) && dev->fwnode == data;
+}
+
+static struct platform_device *arm_smmu_get_dev(struct fwnode_handle *fwnode)
+{
+	struct device *dev;
+
+	dev = bus_find_device(&platform_bus_type, NULL, fwnode,
+			      arm_smmu_dev_node_match);
+	return dev ? to_platform_device(dev) : NULL;
+}
+
 static int arm_smmu_fw_xlate(struct device *dev, struct iommu_fwspec *args)
 {
 	struct arm_smmu_device *smmu;
@@ -1447,6 +1461,8 @@ static int arm_smmu_fw_xlate(struct device *dev, struct iommu_fwspec *args)
 
 	if (is_of_node(args->fwnode))
 		smmu_pdev = of_find_device_by_node(to_of_node(args->fwnode));
+	else if (is_fwnode_iommu(args->fwnode))
+		smmu_pdev = arm_smmu_get_dev(args->fwnode);
 
 	if (!smmu_pdev)
 		return -ENODEV;
-- 
2.6.4