swiotlb: use dma_capable()

This converts swiotlb to use dma_capable() instead of
swiotlb_arch_address_needs_mapping() and is_buffer_dma_capable().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Becky Bruce <beckyb@kernel.crashing.org>

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index cba3db809fbc4e0dc9f07cda8ed3ed3bda47cc90..a012d93792b703d4aa302723c2db5aea195d3ef6 100644 (file)
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -131,12 +131,6 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
        return swiotlb_phys_to_bus(hwdev, virt_to_phys(address));
 }
 
-int __weak swiotlb_arch_address_needs_mapping(struct device *hwdev,
-                                              dma_addr_t addr, size_t size)
-{
-       return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
-}
-
 static void swiotlb_print_info(unsigned long bytes)
 {
        phys_addr_t pstart, pend;
@@ -297,12 +291,6 @@ cleanup1:
        return -ENOMEM;
 }
 
-static inline int
-address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size)
-{
-       return swiotlb_arch_address_needs_mapping(hwdev, addr, size);
-}
-
 static int is_swiotlb_buffer(phys_addr_t paddr)
 {
        return paddr >= virt_to_phys(io_tlb_start) &&
@@ -539,9 +527,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
                dma_mask = hwdev->coherent_dma_mask;
 
        ret = (void *)__get_free_pages(flags, order);
-       if (ret &&
-           !is_buffer_dma_capable(dma_mask, swiotlb_virt_to_bus(hwdev, ret),
-                                  size)) {
+       if (ret && swiotlb_virt_to_bus(hwdev, ret) + size > dma_mask) {
                /*
                 * The allocated memory isn't reachable by the device.
                 */
@@ -563,7 +549,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
        dev_addr = swiotlb_virt_to_bus(hwdev, ret);
 
        /* Confirm address can be DMA'd by device */
-       if (!is_buffer_dma_capable(dma_mask, dev_addr, size)) {
+       if (dev_addr + size > dma_mask) {
                printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
                       (unsigned long long)dma_mask,
                       (unsigned long long)dev_addr);
@@ -635,7 +621,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
         * we can safely return the device addr and not worry about bounce
         * buffering it.
         */
-       if (!address_needs_mapping(dev, dev_addr, size) && !swiotlb_force)
+       if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
                return dev_addr;
 
        /*
@@ -652,7 +638,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
        /*
         * Ensure that the address returned is DMA'ble
         */
-       if (address_needs_mapping(dev, dev_addr, size))
+       if (!dma_capable(dev, dev_addr, size))
                panic("map_single: bounce buffer is not DMA'ble");
 
        return dev_addr;
@@ -805,7 +791,7 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
                dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr);
 
                if (swiotlb_force ||
-                   address_needs_mapping(hwdev, dev_addr, sg->length)) {
+                   !dma_capable(hwdev, dev_addr, sg->length)) {
                        void *map = map_single(hwdev, sg_phys(sg),
                                               sg->length, dir);
                        if (!map) {