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iommu/arm-smmu: Add support for the fsl-mc bus

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Implement bus specific support for the fsl-mc bus including
registering arm_smmu_ops and bus specific device add operations.

Signed-off-by: Nipun Gupta <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Nipun Gupta 2018-09-10 19:19:18 +05:30 • committed by Joerg Roedel
commit eab03e2a1a
4 changed files with 30 additions and 0 deletions
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7
drivers/iommu/arm-smmu.c
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@ -52,6 +52,7 @@
#include <linux/spinlock.h>
#include <linux/amba/bus.h>
#include <linux/fsl/mc.h>
#include "io-pgtable.h"
#include "arm-smmu-regs.h"
@ -1459,6 +1460,8 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev)
if (dev_is_pci(dev))
group = pci_device_group(dev);
else if (dev_is_fsl_mc(dev))
group = fsl_mc_device_group(dev);
else
group = generic_device_group(dev);
@ -2036,6 +2039,10 @@ static void arm_smmu_bus_init(void)
bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
}
#endif
#ifdef CONFIG_FSL_MC_BUS
if (!iommu_present(&fsl_mc_bus_type))
bus_set_iommu(&fsl_mc_bus_type, &arm_smmu_ops);
#endif
}
static int arm_smmu_device_probe(struct platform_device *pdev)

13
drivers/iommu/iommu.c
View file

@ -32,6 +32,7 @@
#include <linux/pci.h>
#include <linux/bitops.h>
#include <linux/property.h>
#include <linux/fsl/mc.h>
#include <trace/events/iommu.h>
static struct kset *iommu_group_kset;
@ -1024,6 +1025,18 @@ struct iommu_group *pci_device_group(struct device *dev)
return iommu_group_alloc();
}
/* Get the IOMMU group for device on fsl-mc bus */
struct iommu_group *fsl_mc_device_group(struct device *dev)
{
struct device *cont_dev = fsl_mc_cont_dev(dev);
struct iommu_group *group;
group = iommu_group_get(cont_dev);
if (!group)
group = iommu_group_alloc();
return group;
}
/**
* iommu_group_get_for_dev - Find or create the IOMMU group for a device
* @dev: target device