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swiotlb: Use physical addresses for swiotlb_tbl_unmap_single

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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>
This commit is contained in:
Alexander Duyck 2012-10-15 10:19:44 -07:00 committed by Konrad Rzeszutek Wilk
parent e05ed4d1fa
commit 61ca08c322
3 changed files with 23 additions and 21 deletions
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4
drivers/xen/swiotlb-xen.c
View File

@ -364,7 +364,7 @@ dma_addr_t xen_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);
dev_addr = 0;
}
return dev_addr;
@ -388,7 +388,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
return;
}

3
include/linux/swiotlb.h
View File

@ -43,7 +43,8 @@ extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
phys_addr_t phys, size_t size,
enum dma_data_direction dir);
extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
extern void swiotlb_tbl_unmap_single(struct device *hwdev,
phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir);
extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,

37
lib/swiotlb.c
View File

@ -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;
}