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iommu/arm-smmu: Support DMA-API domains 

With DMA mapping ops provided by the iommu-dma code, only a minimal
contribution from the IOMMU driver is needed to create a suitable
DMA-API domain for them to use. Implement this for the ARM SMMUs.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Robin Murphy 2016-01-26 18:06:36 +00:00 committed by Will Deacon
parent d346180e70
commit 9adb95949a
2 changed files with 18 additions and 2 deletions
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10
drivers/iommu/arm-smmu-v3.c
View File

@ -21,6 +21,7 @@
*/
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/iommu.h>
@ -1396,7 +1397,7 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
{
struct arm_smmu_domain *smmu_domain;
if (type != IOMMU_DOMAIN_UNMANAGED)
if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
return NULL;
/*
@ -1408,6 +1409,12 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
if (!smmu_domain)
return NULL;
if (type == IOMMU_DOMAIN_DMA &&
iommu_get_dma_cookie(&smmu_domain->domain)) {
kfree(smmu_domain);
return NULL;
}
mutex_init(&smmu_domain->init_mutex);
spin_lock_init(&smmu_domain->pgtbl_lock);
return &smmu_domain->domain;
@ -1436,6 +1443,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_device *smmu = smmu_domain->smmu;
iommu_put_dma_cookie(domain);
free_io_pgtable_ops(smmu_domain->pgtbl_ops);
/* Free the CD and ASID, if we allocated them */

10
drivers/iommu/arm-smmu.c
View File

@ -29,6 +29,7 @@
#define pr_fmt(fmt) "arm-smmu: " fmt
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
@ -966,7 +967,7 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
{
struct arm_smmu_domain *smmu_domain;
if (type != IOMMU_DOMAIN_UNMANAGED)
if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
return NULL;
/*
* Allocate the domain and initialise some of its data structures.
@ -977,6 +978,12 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
if (!smmu_domain)
return NULL;
if (type == IOMMU_DOMAIN_DMA &&
iommu_get_dma_cookie(&smmu_domain->domain)) {
kfree(smmu_domain);
return NULL;
}
mutex_init(&smmu_domain->init_mutex);
spin_lock_init(&smmu_domain->pgtbl_lock);
@ -991,6 +998,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
* Free the domain resources. We assume that all devices have
* already been detached.
*/
iommu_put_dma_cookie(domain);
arm_smmu_destroy_domain_context(domain);
kfree(smmu_domain);
}