[PATCH 10/18] iommu/msm: Add IOMMU_DOMAIN_DMA support

Robin Murphy
2020-08-20T15:09:54Z

Now that arch/arm is wired up for default domains and iommu-dma,
implement the corresponding driver-side support for DMA domains.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/msm_iommu.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 3615cd6241c4..f34efcbb0b2b 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/dma-iommu.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/io-pgtable.h>
@@ -314,13 +315,16 @@ static struct iommu_domain *msm_iommu_domain_alloc(unsigned type)
{
struct msm_priv *priv;

- if (type != IOMMU_DOMAIN_UNMANAGED)
+ if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
return NULL;

priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
goto fail_nomem;

+ if (type == IOMMU_DOMAIN_DMA && iommu_get_dma_cookie(&priv->domain))
+ goto fail_nomem;
+
INIT_LIST_HEAD(&priv->list_attached);

priv->domain.geometry.aperture_start = 0;
@@ -339,6 +343,7 @@ static void msm_iommu_domain_free(struct iommu_domain *domain)
struct msm_priv *priv;
unsigned long flags;

+ iommu_put_dma_cookie(domain);
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = to_msm_priv(domain);
kfree(priv);
--
2.28.0.dirty