[PATCH 08/10] sparc64/pci_sun4v: implement DMA_ATTR_NON_CONSISTENT

[Christoph Hellwig]

Just allocate the memory and use map_page to map the memory.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 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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