From af51a9f1848ff50079a10def56a2c064f326af22 Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Mon, 15 Oct 2012 10:19:55 -0700 Subject: [PATCH] swiotlb: Do not export swiotlb_bounce since there are no external consumers Currently swiotlb is the only consumer for swiotlb_bounce. Since that is the case it doesn't make much sense to be exporting it so make it a static function only. In addition we can save a few more lines of code by making it so that it accepts the DMA address as a physical address instead of a virtual one. This is the last piece in essentially pushing all of the DMA address values to use physical addresses in swiotlb. In order to clarify things since we now have 2 physical addresses in use inside of swiotlb_bounce 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 Signed-off-by: Konrad Rzeszutek Wilk --- include/linux/swiotlb.h | 3 --- lib/swiotlb.c | 35 ++++++++++++++++------------------- 2 files changed, 16 insertions(+), 22 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index e0ac98fd81a9..071d62c214a6 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -53,9 +53,6 @@ extern void swiotlb_tbl_sync_single(struct device *hwdev, enum dma_sync_target target); /* Accessory functions. */ -extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, - enum dma_data_direction dir); - extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t flags); diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 16a548dc91ac..196b06984dec 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -355,14 +355,15 @@ static int is_swiotlb_buffer(phys_addr_t paddr) /* * Bounce: copy the swiotlb buffer back to the original dma location */ -void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, - enum dma_data_direction dir) +static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr, + size_t size, enum dma_data_direction dir) { - unsigned long pfn = PFN_DOWN(phys); + unsigned long pfn = PFN_DOWN(orig_addr); + unsigned char *vaddr = phys_to_virt(tlb_addr); if (PageHighMem(pfn_to_page(pfn))) { /* The buffer does not have a mapping. Map it in and copy */ - unsigned int offset = phys & ~PAGE_MASK; + unsigned int offset = orig_addr & ~PAGE_MASK; char *buffer; unsigned int sz = 0; unsigned long flags; @@ -373,25 +374,23 @@ void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, local_irq_save(flags); buffer = kmap_atomic(pfn_to_page(pfn)); if (dir == DMA_TO_DEVICE) - memcpy(dma_addr, buffer + offset, sz); + memcpy(vaddr, buffer + offset, sz); else - memcpy(buffer + offset, dma_addr, sz); + memcpy(buffer + offset, vaddr, sz); kunmap_atomic(buffer); local_irq_restore(flags); size -= sz; pfn++; - dma_addr += sz; + vaddr += sz; offset = 0; } + } else if (dir == DMA_TO_DEVICE) { + memcpy(vaddr, phys_to_virt(orig_addr), size); } else { - if (dir == DMA_TO_DEVICE) - memcpy(dma_addr, phys_to_virt(phys), size); - else - memcpy(phys_to_virt(phys), dma_addr, size); + memcpy(phys_to_virt(orig_addr), vaddr, size); } } -EXPORT_SYMBOL_GPL(swiotlb_bounce); phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr, @@ -493,8 +492,7 @@ found: for (i = 0; i < nslots; i++) io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT); if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) - swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr), size, - DMA_TO_DEVICE); + swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE); return tlb_addr; } @@ -526,9 +524,8 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr, /* * First, sync the memory before unmapping the entry */ - if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) - swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr), - size, DMA_FROM_DEVICE); + if (orig_addr && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) + swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE); /* * Return the buffer to the free list by setting the corresponding @@ -569,14 +566,14 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr, switch (target) { case SYNC_FOR_CPU: if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) - swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr), + swiotlb_bounce(orig_addr, 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(orig_addr, phys_to_virt(tlb_addr), + swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE); else BUG_ON(dir != DMA_FROM_DEVICE); -- 2.34.1