Just allocate the memory and use map_page to map the memory.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/sparc/kernel/pci_sun4v.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index b95c70136559..24a76ecf2986 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -590,6 +590,14 @@ static void *dma_4v_alloc(struct device *dev, size_t size,
first_page = (unsigned long) page_address(page);
memset((char *)first_page, 0, PAGE_SIZE << order);
+ if (attrs & DMA_ATTR_NON_CONSISTENT) {
+ *dma_addrp = dma_4v_map_page(dev, page, 0, size,
+ DMA_BIDIRECTIONAL, 0);
+ if (*dma_addrp == DMA_MAPPING_ERROR)
+ goto range_alloc_fail;
+ return page_address(page);
+ }
+
iommu = dev->archdata.iommu;
atu = iommu->atu;
@@ -649,6 +657,11 @@ static void dma_4v_free(struct device *dev, size_t size, void *cpu,
unsigned long iotsb_num;
u32 devhandle;
+ if (attrs & DMA_ATTR_NON_CONSISTENT) {
+ dma_4v_unmap_page(dev, dvma, size, DMA_BIDIRECTIONAL, 0);
+ goto free_pages;
+ }
+
npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
iommu = dev->archdata.iommu;
pbm = dev->archdata.host_controller;
@@ -665,6 +678,7 @@ static void dma_4v_free(struct device *dev, size_t size, void *cpu,
entry = ((dvma - tbl->table_map_base) >> IO_PAGE_SHIFT);
dma_4v_iommu_demap(dev, devhandle, dvma, iotsb_num, entry, npages);
iommu_tbl_range_free(tbl, dvma, npages, IOMMU_ERROR_CODE);
+free_pages:
order = get_order(size);
if (order < 10)
free_pages((unsigned long)cpu, order);
--
2.19.2
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