From: David Stevens <[email protected]>
Introduce a new dev_use_swiotlb function to guard swiotlb code, instead
of overloading dev_is_untrusted. This allows CONFIG_SWIOTLB to be
checked more broadly, so the swiotlb related code can be removed more
aggressively.
Signed-off-by: David Stevens <[email protected]>
---
drivers/iommu/dma-iommu.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index be0214b1455c..89b689bf801f 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -317,6 +317,11 @@ static bool dev_is_untrusted(struct device *dev)
return dev_is_pci(dev) && to_pci_dev(dev)->untrusted;
}
+static bool dev_use_swiotlb(struct device *dev)
+{
+ return IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev);
+}
+
/**
* iommu_dma_init_domain - Initialise a DMA mapping domain
* @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
@@ -553,8 +558,7 @@ static dma_addr_t __iommu_dma_map_swiotlb(struct device *dev, phys_addr_t phys,
* If both the physical buffer start address and size are
* page aligned, we don't need to use a bounce page.
*/
- if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) &&
- iova_offset(iovad, phys | org_size)) {
+ if (dev_use_swiotlb(dev) && iova_offset(iovad, phys | org_size)) {
aligned_size = iova_align(iovad, org_size);
phys = swiotlb_tbl_map_single(dev, phys, org_size,
aligned_size, dir, attrs);
@@ -779,7 +783,7 @@ static void iommu_dma_sync_single_for_cpu(struct device *dev,
{
phys_addr_t phys;
- if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+ if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
return;
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
@@ -795,7 +799,7 @@ static void iommu_dma_sync_single_for_device(struct device *dev,
{
phys_addr_t phys;
- if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+ if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
return;
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
@@ -813,10 +817,10 @@ static void iommu_dma_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sg;
int i;
- if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+ if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
return;
- if (dev_is_untrusted(dev))
+ if (dev_use_swiotlb(dev))
for_each_sg(sgl, sg, nelems, i)
iommu_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
sg->length, dir);
@@ -832,10 +836,10 @@ static void iommu_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sg;
int i;
- if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+ if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
return;
- if (dev_is_untrusted(dev))
+ if (dev_use_swiotlb(dev))
for_each_sg(sgl, sg, nelems, i)
iommu_dma_sync_single_for_device(dev,
sg_dma_address(sg),
@@ -999,7 +1003,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
iommu_deferred_attach(dev, domain))
return 0;
- if (dev_is_untrusted(dev))
+ if (dev_use_swiotlb(dev))
return iommu_dma_map_sg_swiotlb(dev, sg, nents, dir, attrs);
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
@@ -1078,7 +1082,7 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
}
- if (dev_is_untrusted(dev)) {
+ if (dev_use_swiotlb(dev)) {
iommu_dma_unmap_sg_swiotlb(dev, sg, nents, dir, attrs);
return;
}
--
2.32.0.605.g8dce9f2422-goog
On 2021-08-11 03:42, David Stevens wrote:
> From: David Stevens <[email protected]>
>
> Introduce a new dev_use_swiotlb function to guard swiotlb code, instead
> of overloading dev_is_untrusted. This allows CONFIG_SWIOTLB to be
> checked more broadly, so the swiotlb related code can be removed more
> aggressively.
Reviewed-by: Robin Murphy <[email protected]>
> Signed-off-by: David Stevens <[email protected]>
> ---
> drivers/iommu/dma-iommu.c | 24 ++++++++++++++----------
> 1 file changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index be0214b1455c..89b689bf801f 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -317,6 +317,11 @@ static bool dev_is_untrusted(struct device *dev)
> return dev_is_pci(dev) && to_pci_dev(dev)->untrusted;
> }
>
> +static bool dev_use_swiotlb(struct device *dev)
> +{
> + return IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev);
> +}
> +
> /**
> * iommu_dma_init_domain - Initialise a DMA mapping domain
> * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
> @@ -553,8 +558,7 @@ static dma_addr_t __iommu_dma_map_swiotlb(struct device *dev, phys_addr_t phys,
> * If both the physical buffer start address and size are
> * page aligned, we don't need to use a bounce page.
> */
> - if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) &&
> - iova_offset(iovad, phys | org_size)) {
> + if (dev_use_swiotlb(dev) && iova_offset(iovad, phys | org_size)) {
> aligned_size = iova_align(iovad, org_size);
> phys = swiotlb_tbl_map_single(dev, phys, org_size,
> aligned_size, dir, attrs);
> @@ -779,7 +783,7 @@ static void iommu_dma_sync_single_for_cpu(struct device *dev,
> {
> phys_addr_t phys;
>
> - if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
> + if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
> return;
>
> phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
> @@ -795,7 +799,7 @@ static void iommu_dma_sync_single_for_device(struct device *dev,
> {
> phys_addr_t phys;
>
> - if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
> + if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
> return;
>
> phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
> @@ -813,10 +817,10 @@ static void iommu_dma_sync_sg_for_cpu(struct device *dev,
> struct scatterlist *sg;
> int i;
>
> - if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
> + if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
> return;
>
> - if (dev_is_untrusted(dev))
> + if (dev_use_swiotlb(dev))
> for_each_sg(sgl, sg, nelems, i)
> iommu_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
> sg->length, dir);
> @@ -832,10 +836,10 @@ static void iommu_dma_sync_sg_for_device(struct device *dev,
> struct scatterlist *sg;
> int i;
>
> - if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
> + if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
> return;
>
> - if (dev_is_untrusted(dev))
> + if (dev_use_swiotlb(dev))
> for_each_sg(sgl, sg, nelems, i)
> iommu_dma_sync_single_for_device(dev,
> sg_dma_address(sg),
> @@ -999,7 +1003,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
> iommu_deferred_attach(dev, domain))
> return 0;
>
> - if (dev_is_untrusted(dev))
> + if (dev_use_swiotlb(dev))
> return iommu_dma_map_sg_swiotlb(dev, sg, nents, dir, attrs);
>
> if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
> @@ -1078,7 +1082,7 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
> attrs |= DMA_ATTR_SKIP_CPU_SYNC;
> }
>
> - if (dev_is_untrusted(dev)) {
> + if (dev_use_swiotlb(dev)) {
> iommu_dma_unmap_sg_swiotlb(dev, sg, nents, dir, attrs);
> return;
> }
>