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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2012-10-15 21:19:49 +0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-10-30 17:32:07 +0400 |
| commit | fbfda893eb570bbe9e9ad9128b6e9cf2a1e48c87 (patch) | |
| tree | c79485f1cec2861db3f86852629c19d32fda30bd /lib/swiotlb.c | |
| parent | 61ca08c3220032dd88815b3465d56cb779258168 (diff) | |
| download | linux-fbfda893eb570bbe9e9ad9128b6e9cf2a1e48c87.tar.xz | |
swiotlb: Use physical addresses instead of virtual in swiotlb_tbl_sync_single
This change makes it so that the sync 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_sync_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/swiotlb.c')
| -rw-r--r-- | lib/swiotlb.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c index d7701dcf407f..16a548dc91ac 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -557,26 +557,27 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr, } EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single); -void -swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size, - enum dma_data_direction dir, - enum dma_sync_target target) +void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr, + size_t size, enum dma_data_direction dir, + enum dma_sync_target target) { - 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]; - phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1)); + orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1); switch (target) { case SYNC_FOR_CPU: if (likely(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); else BUG_ON(dir != DMA_TO_DEVICE); break; case SYNC_FOR_DEVICE: if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) - swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); + swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr), + size, DMA_TO_DEVICE); else BUG_ON(dir != DMA_FROM_DEVICE); break; @@ -785,8 +786,7 @@ swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, BUG_ON(dir == DMA_NONE); if (is_swiotlb_buffer(paddr)) { - swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir, - target); + swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target); return; } |