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authorChristoph Hellwig <hch@lst.de>2019-04-16 21:23:44 +0300
committerDavid S. Miller <davem@davemloft.net>2019-05-09 03:11:57 +0300
commit8668b38c1c7720baf76da15a7a7eef43ae0c65a4 (patch)
tree2d8cb8d460a88fc2ff57b09d94ea7fbf3391082f /arch/sparc/mm/iommu.c
parentb82059428c0577c2ec082974d7956291d5eae2cf (diff)
downloadlinux-8668b38c1c7720baf76da15a7a7eef43ae0c65a4.tar.xz
sparc/iommu: move per-page flushing into __sbus_iommu_map_page
This prepares for reusing __sbus_iommu_map_page in the map_sg path. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm/iommu.c')
-rw-r--r--arch/sparc/mm/iommu.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index 19d9266e4049..7e191c8ae46a 100644
--- a/arch/sparc/mm/iommu.c
+++ b/arch/sparc/mm/iommu.c
@@ -207,15 +207,25 @@ static u32 iommu_get_one(struct device *dev, phys_addr_t paddr, int npages)
}
static dma_addr_t __sbus_iommu_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t len)
+ unsigned long offset, size_t len, bool per_page_flush)
{
void *vaddr = page_address(page) + offset;
unsigned long off = (unsigned long)vaddr & ~PAGE_MASK;
unsigned long npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-
+
/* XXX So what is maxphys for us and how do drivers know it? */
if (!len || len > 256 * 1024)
return DMA_MAPPING_ERROR;
+
+ if (per_page_flush) {
+ unsigned long p = (unsigned long)vaddr & PAGE_MASK;
+
+ while (p < (unsigned long)vaddr + len) {
+ flush_page_for_dma(p);
+ p += PAGE_SIZE;
+ }
+ }
+
return iommu_get_one(dev, virt_to_phys(vaddr), npages) + off;
}
@@ -224,22 +234,14 @@ static dma_addr_t sbus_iommu_map_page_gflush(struct device *dev,
enum dma_data_direction dir, unsigned long attrs)
{
flush_page_for_dma(0);
- return __sbus_iommu_map_page(dev, page, offset, len);
+ return __sbus_iommu_map_page(dev, page, offset, len, false);
}
static dma_addr_t sbus_iommu_map_page_pflush(struct device *dev,
struct page *page, unsigned long offset, size_t len,
enum dma_data_direction dir, unsigned long attrs)
{
- void *vaddr = page_address(page) + offset;
- unsigned long p = ((unsigned long)vaddr) & PAGE_MASK;
-
- while (p < (unsigned long)vaddr + len) {
- flush_page_for_dma(p);
- p += PAGE_SIZE;
- }
-
- return __sbus_iommu_map_page(dev, page, offset, len);
+ return __sbus_iommu_map_page(dev, page, offset, len, true);
}
static int __sbus_iommu_map_sg(struct device *dev, struct scatterlist *sgl,