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authorMarek Szyprowski <m.szyprowski@samsung.com>2016-02-18 17:12:49 +0300
committerJoerg Roedel <jroedel@suse.de>2016-02-25 17:32:09 +0300
commit58c6f6a3dc97ed1a5a5262279a2e9db41bd6d035 (patch)
tree0836e571a8a49a8248779f35d3fe75a03a8bf572 /drivers/iommu
parent6c2ae7e2916b028bd4c0fff04589bd176487a122 (diff)
downloadlinux-58c6f6a3dc97ed1a5a5262279a2e9db41bd6d035.tar.xz
iommu/exynos: Add support for IOMMU_DOMAIN_DMA domain type
This patch adds support for DMA domain type. Such domain have DMA cookie prepared and can be used by generic DMA-IOMMU glue layer. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/exynos-iommu.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 4fc079073c86..595e0da55db4 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -25,9 +25,9 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
+#include <linux/dma-iommu.h>
#include <asm/cacheflush.h>
-#include <asm/dma-iommu.h>
#include <asm/pgtable.h>
typedef u32 sysmmu_iova_t;
@@ -662,16 +662,21 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
struct exynos_iommu_domain *domain;
int i;
- if (type != IOMMU_DOMAIN_UNMANAGED)
- return NULL;
domain = kzalloc(sizeof(*domain), GFP_KERNEL);
if (!domain)
return NULL;
+ if (type == IOMMU_DOMAIN_DMA) {
+ if (iommu_get_dma_cookie(&domain->domain) != 0)
+ goto err_pgtable;
+ } else if (type != IOMMU_DOMAIN_UNMANAGED) {
+ goto err_pgtable;
+ }
+
domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2);
if (!domain->pgtable)
- goto err_pgtable;
+ goto err_dma_cookie;
domain->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
if (!domain->lv2entcnt)
@@ -703,6 +708,9 @@ static struct iommu_domain *exynos_iommu_domain_alloc(unsigned type)
err_counter:
free_pages((unsigned long)domain->pgtable, 2);
+err_dma_cookie:
+ if (type == IOMMU_DOMAIN_DMA)
+ iommu_put_dma_cookie(&domain->domain);
err_pgtable:
kfree(domain);
return NULL;
@@ -727,6 +735,9 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
spin_unlock_irqrestore(&domain->lock, flags);
+ if (iommu_domain->type == IOMMU_DOMAIN_DMA)
+ iommu_put_dma_cookie(iommu_domain);
+
for (i = 0; i < NUM_LV1ENTRIES; i++)
if (lv1ent_page(domain->pgtable + i))
kmem_cache_free(lv2table_kmem_cache,