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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-10-15 10:19:44 -0700
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-10-30 09:32:07 -0400
commit61ca08c3220032dd88815b3465d56cb779258168 (patch)
treeb126015d4fd76ff1e4b936097877e734aa19746b /lib
parente05ed4d1fad9e730995abb08cb9bc3bffac5018b (diff)
downloadvexpress-lsk-61ca08c3220032dd88815b3465d56cb779258168.tar.gz
swiotlb: Use physical addresses for swiotlb_tbl_unmap_single
This change makes it so that the unmap functionality also uses physical addresses. This helps to further reduce the use of virt_to_phys and phys_to_virt functions. In order to clarify things since we now have 2 physical addresses in use inside of swiotlb_tbl_unmap_single I am renaming phys to orig_addr, and dma_addr to tlb_addr. This way is should be clear that orig_addr is contained within io_orig_addr and tlb_addr is an address within the io_tlb_addr buffer. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/swiotlb.c37
1 files changed, 19 insertions, 18 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 3adc148bb8d..d7701dcf407 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -515,20 +515,20 @@ phys_addr_t map_single(struct device *hwdev, phys_addr_t phys, size_t size,
/*
* dma_addr is the kernel virtual address of the bounce buffer to unmap.
*/
-void
-swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
- enum dma_data_direction dir)
+void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir)
{
unsigned long flags;
int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
- int index = (dma_addr - (char *)phys_to_virt(io_tlb_start)) >> IO_TLB_SHIFT;
- phys_addr_t phys = io_tlb_orig_addr[index];
+ int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
+ phys_addr_t orig_addr = io_tlb_orig_addr[index];
/*
* First, sync the memory before unmapping the entry
*/
if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
- swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE);
+ swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr),
+ size, DMA_FROM_DEVICE);
/*
* Return the buffer to the free list by setting the corresponding
@@ -621,17 +621,18 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
ret = phys_to_virt(paddr);
dev_addr = phys_to_dma(hwdev, paddr);
- }
- /* Confirm address can be DMA'd by device */
- if (dev_addr + size - 1 > dma_mask) {
- printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
- (unsigned long long)dma_mask,
- (unsigned long long)dev_addr);
+ /* Confirm address can be DMA'd by device */
+ if (dev_addr + size - 1 > dma_mask) {
+ printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
+ (unsigned long long)dma_mask,
+ (unsigned long long)dev_addr);
- /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
- swiotlb_tbl_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
- return NULL;
+ /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
+ swiotlb_tbl_unmap_single(hwdev, paddr,
+ size, DMA_TO_DEVICE);
+ return NULL;
+ }
}
*dma_handle = dev_addr;
@@ -652,7 +653,7 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
free_pages((unsigned long)vaddr, get_order(size));
else
/* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */
- swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
+ swiotlb_tbl_unmap_single(hwdev, paddr, size, DMA_TO_DEVICE);
}
EXPORT_SYMBOL(swiotlb_free_coherent);
@@ -716,7 +717,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
/* Ensure that the address returned is DMA'ble */
if (!dma_capable(dev, dev_addr, size)) {
- swiotlb_tbl_unmap_single(dev, phys_to_virt(map), size, dir);
+ swiotlb_tbl_unmap_single(dev, map, size, dir);
return phys_to_dma(dev, io_tlb_overflow_buffer);
}
@@ -740,7 +741,7 @@ static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(paddr)) {
- swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
+ swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
return;
}