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dma-iommu: implement ->alloc_noncontiguous

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Implement support for allocating a non-contiguous DMA region.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Ricardo Ribalda <ribalda@chromium.org>
This commit is contained in:
Christoph Hellwig 2021-01-28 14:47:29 +01:00
parent 8230ce9a4e
commit e817ee5f2f
1 changed files with 36 additions and 0 deletions
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36
drivers/iommu/dma-iommu.c
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@ -708,6 +708,7 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
goto out_free_sg;
sgt->sgl->dma_address = iova;
sgt->sgl->dma_length = size;
return pages;
out_free_sg:
@ -745,6 +746,37 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size,
return NULL;
}
#ifdef CONFIG_DMA_REMAP
static struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev,
size_t size, enum dma_data_direction dir, gfp_t gfp,
unsigned long attrs)
{
struct dma_sgt_handle *sh;
sh = kmalloc(sizeof(*sh), gfp);
if (!sh)
return NULL;
sh->pages = __iommu_dma_alloc_noncontiguous(dev, size, &sh->sgt, gfp,
PAGE_KERNEL, attrs);
if (!sh->pages) {
kfree(sh);
return NULL;
}
return &sh->sgt;
}
static void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
struct sg_table *sgt, enum dma_data_direction dir)
{
struct dma_sgt_handle *sh = sgt_handle(sgt);
__iommu_dma_unmap(dev, sgt->sgl->dma_address, size);
__iommu_dma_free_pages(sh->pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
sg_free_table(&sh->sgt);
}
#endif /* CONFIG_DMA_REMAP */
static void iommu_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
{
@ -1261,6 +1293,10 @@ static const struct dma_map_ops iommu_dma_ops = {
.free = iommu_dma_free,
.alloc_pages = dma_common_alloc_pages,
.free_pages = dma_common_free_pages,
#ifdef CONFIG_DMA_REMAP
.alloc_noncontiguous = iommu_dma_alloc_noncontiguous,
.free_noncontiguous = iommu_dma_free_noncontiguous,
#endif
.mmap = iommu_dma_mmap,
.get_sgtable = iommu_dma_get_sgtable,
.map_page = iommu_dma_map_page,