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authorChristoph Hellwig <hch@lst.de>2019-04-10 18:14:07 +0200
committerJoerg Roedel <jroedel@suse.de>2019-04-11 17:46:34 +0200
commit9cc0c2af8d0387f3f99572bd7fe15ab41eb89bb9 (patch)
tree0d0a5c067e921dfdf6e703dc28ddb65dcdec3bcc /drivers/iommu/intel-iommu.c
parent48b2c937ea37a3bece0094b46450ed5267525289 (diff)
downloadlinux-9cc0c2af8d0387f3f99572bd7fe15ab41eb89bb9.tar.bz2
iommu/vt-d: Use dma_direct for bypass devices
The intel-iommu driver currently has a partial reimplementation of the direct mapping code for devices that use pass through mode. Replace that code with calls to the relevant dma_direct routines at the highest level. This means we have exactly the same behvior as the dma direct code itself, and can prepare for eventually only attaching the intel_iommu ops to devices that actually need dynamic iommu mappings. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
-rw-r--r--drivers/iommu/intel-iommu.c71
1 files changed, 31 insertions, 40 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 46337a4ea33e..1b7dd11e5581 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3657,9 +3657,6 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
BUG_ON(dir == DMA_NONE);
- if (!iommu_need_mapping(dev))
- return paddr;
-
domain = get_valid_domain_for_dev(dev);
if (!domain)
return DMA_MAPPING_ERROR;
@@ -3708,15 +3705,20 @@ static dma_addr_t intel_map_page(struct device *dev, struct page *page,
enum dma_data_direction dir,
unsigned long attrs)
{
- return __intel_map_single(dev, page_to_phys(page) + offset, size,
- dir, *dev->dma_mask);
+ if (iommu_need_mapping(dev))
+ return __intel_map_single(dev, page_to_phys(page) + offset,
+ size, dir, *dev->dma_mask);
+ return dma_direct_map_page(dev, page, offset, size, dir, attrs);
}
static dma_addr_t intel_map_resource(struct device *dev, phys_addr_t phys_addr,
size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
- return __intel_map_single(dev, phys_addr, size, dir, *dev->dma_mask);
+ if (iommu_need_mapping(dev))
+ return __intel_map_single(dev, phys_addr, size, dir,
+ *dev->dma_mask);
+ return dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
}
static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
@@ -3728,9 +3730,6 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
struct intel_iommu *iommu;
struct page *freelist;
- if (!iommu_need_mapping(dev))
- return;
-
domain = find_domain(dev);
BUG_ON(!domain);
@@ -3766,7 +3765,17 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
- intel_unmap(dev, dev_addr, size);
+ if (iommu_need_mapping(dev))
+ intel_unmap(dev, dev_addr, size);
+ else
+ dma_direct_unmap_page(dev, dev_addr, size, dir, attrs);
+}
+
+static void intel_unmap_resource(struct device *dev, dma_addr_t dev_addr,
+ size_t size, enum dma_data_direction dir, unsigned long attrs)
+{
+ if (iommu_need_mapping(dev))
+ intel_unmap(dev, dev_addr, size);
}
static void *intel_alloc_coherent(struct device *dev, size_t size,
@@ -3776,28 +3785,18 @@ static void *intel_alloc_coherent(struct device *dev, size_t size,
struct page *page = NULL;
int order;
+ if (!iommu_need_mapping(dev))
+ return dma_direct_alloc(dev, size, dma_handle, flags, attrs);
+
size = PAGE_ALIGN(size);
order = get_order(size);
-
- if (iommu_need_mapping(dev))
- flags &= ~(GFP_DMA | GFP_DMA32);
- else if (dev->coherent_dma_mask < dma_get_required_mask(dev)) {
- if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
- flags |= GFP_DMA;
- else
- flags |= GFP_DMA32;
- }
+ flags &= ~(GFP_DMA | GFP_DMA32);
if (gfpflags_allow_blocking(flags)) {
unsigned int count = size >> PAGE_SHIFT;
page = dma_alloc_from_contiguous(dev, count, order,
flags & __GFP_NOWARN);
- if (page && !iommu_need_mapping(dev) &&
- page_to_phys(page) + size > dev->coherent_dma_mask) {
- dma_release_from_contiguous(dev, page, count);
- page = NULL;
- }
}
if (!page)
@@ -3823,6 +3822,9 @@ static void intel_free_coherent(struct device *dev, size_t size, void *vaddr,
int order;
struct page *page = virt_to_page(vaddr);
+ if (!iommu_need_mapping(dev))
+ return dma_direct_free(dev, size, vaddr, dma_handle, attrs);
+
size = PAGE_ALIGN(size);
order = get_order(size);
@@ -3840,6 +3842,9 @@ static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist,
struct scatterlist *sg;
int i;
+ if (!iommu_need_mapping(dev))
+ return dma_direct_unmap_sg(dev, sglist, nelems, dir, attrs);
+
for_each_sg(sglist, sg, nelems, i) {
nrpages += aligned_nrpages(sg_dma_address(sg), sg_dma_len(sg));
}
@@ -3847,20 +3852,6 @@ static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist,
intel_unmap(dev, startaddr, nrpages << VTD_PAGE_SHIFT);
}
-static int intel_nontranslate_map_sg(struct device *hddev,
- struct scatterlist *sglist, int nelems, int dir)
-{
- int i;
- struct scatterlist *sg;
-
- for_each_sg(sglist, sg, nelems, i) {
- BUG_ON(!sg_page(sg));
- sg->dma_address = sg_phys(sg);
- sg->dma_length = sg->length;
- }
- return nelems;
-}
-
static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nelems,
enum dma_data_direction dir, unsigned long attrs)
{
@@ -3876,7 +3867,7 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
BUG_ON(dir == DMA_NONE);
if (!iommu_need_mapping(dev))
- return intel_nontranslate_map_sg(dev, sglist, nelems, dir);
+ return dma_direct_map_sg(dev, sglist, nelems, dir, attrs);
domain = get_valid_domain_for_dev(dev);
if (!domain)
@@ -3926,7 +3917,7 @@ static const struct dma_map_ops intel_dma_ops = {
.map_page = intel_map_page,
.unmap_page = intel_unmap_page,
.map_resource = intel_map_resource,
- .unmap_resource = intel_unmap_page,
+ .unmap_resource = intel_unmap_resource,
.dma_supported = dma_direct_supported,
};