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iommu/exynos: Add support for IOMMU_DOMAIN_DMA domain type

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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>
This commit is contained in:
Marek Szyprowski 2016-02-18 15:12:49 +01:00 committed by Joerg Roedel
parent 6c2ae7e291
commit 58c6f6a3dc
1 changed files with 15 additions and 4 deletions
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19
drivers/iommu/exynos-iommu.c
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@ -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,