[PATCH 10/18] iommu/msm: Add IOMMU_DOMAIN_DMA support
From: Robin Murphy <robin.murphy@arm.com>
Date: 2020-08-20 15:09:54
Also in:
dri-devel, linux-arm-msm, linux-iommu, linux-media, linux-mediatek, linux-samsung-soc, linux-tegra, lkml
Subsystem:
arm/qualcomm mailing list, iommu subsystem, qualcomm iommu, the rest · Maintainers:
Joerg Roedel, Will Deacon, Rob Clark, Linus Torvalds
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
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