diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/swiotlb.c | 56 |
1 files changed, 32 insertions, 24 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c index bc684d1fd42..067eed5b275 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -1,7 +1,7 @@ /* * Dynamic DMA mapping support. * - * This implementation is for IA-64 and EM64T platforms that do not support + * This implementation is a fallback for platforms that do not support * I/O TLBs (aka DMA address translation hardware). * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com> * Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com> @@ -129,23 +129,25 @@ __setup("swiotlb=", setup_io_tlb_npages); * Statically reserve bounce buffer space and initialize bounce buffer data * structures for the software IO TLB used to implement the DMA API. */ -void -swiotlb_init_with_default_size (size_t default_size) +void __init +swiotlb_init_with_default_size(size_t default_size) { - unsigned long i; + unsigned long i, bytes; if (!io_tlb_nslabs) { io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); } + bytes = io_tlb_nslabs << IO_TLB_SHIFT; + /* * Get IO TLB memory from the low pages */ - io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs * (1 << IO_TLB_SHIFT)); + io_tlb_start = alloc_bootmem_low_pages(bytes); if (!io_tlb_start) panic("Cannot allocate SWIOTLB buffer"); - io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT); + io_tlb_end = io_tlb_start + bytes; /* * Allocate and initialize the free list array. This array is used @@ -162,12 +164,15 @@ swiotlb_init_with_default_size (size_t default_size) * Get the overflow emergency buffer */ io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); + if (!io_tlb_overflow_buffer) + panic("Cannot allocate SWIOTLB overflow buffer!\n"); + printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n", virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end)); } -void -swiotlb_init (void) +void __init +swiotlb_init(void) { swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */ } @@ -178,9 +183,9 @@ swiotlb_init (void) * This should be just like above, but with some error catching. */ int -swiotlb_late_init_with_default_size (size_t default_size) +swiotlb_late_init_with_default_size(size_t default_size) { - unsigned long i, req_nslabs = io_tlb_nslabs; + unsigned long i, bytes, req_nslabs = io_tlb_nslabs; unsigned int order; if (!io_tlb_nslabs) { @@ -191,8 +196,9 @@ swiotlb_late_init_with_default_size (size_t default_size) /* * Get IO TLB memory from the low pages */ - order = get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT)); + order = get_order(io_tlb_nslabs << IO_TLB_SHIFT); io_tlb_nslabs = SLABS_PER_PAGE << order; + bytes = io_tlb_nslabs << IO_TLB_SHIFT; while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { io_tlb_start = (char *)__get_free_pages(GFP_DMA | __GFP_NOWARN, @@ -205,13 +211,14 @@ swiotlb_late_init_with_default_size (size_t default_size) if (!io_tlb_start) goto cleanup1; - if (order != get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT))) { + if (order != get_order(bytes)) { printk(KERN_WARNING "Warning: only able to allocate %ld MB " "for software IO TLB\n", (PAGE_SIZE << order) >> 20); io_tlb_nslabs = SLABS_PER_PAGE << order; + bytes = io_tlb_nslabs << IO_TLB_SHIFT; } - io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT); - memset(io_tlb_start, 0, io_tlb_nslabs * (1 << IO_TLB_SHIFT)); + io_tlb_end = io_tlb_start + bytes; + memset(io_tlb_start, 0, bytes); /* * Allocate and initialize the free list array. This array is used @@ -242,8 +249,8 @@ swiotlb_late_init_with_default_size (size_t default_size) if (!io_tlb_overflow_buffer) goto cleanup4; - printk(KERN_INFO "Placing %ldMB software IO TLB between 0x%lx - " - "0x%lx\n", (io_tlb_nslabs * (1 << IO_TLB_SHIFT)) >> 20, + printk(KERN_INFO "Placing %luMB software IO TLB between 0x%lx - " + "0x%lx\n", bytes >> 20, virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end)); return 0; @@ -256,8 +263,8 @@ cleanup3: free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * sizeof(int))); io_tlb_list = NULL; - io_tlb_end = NULL; cleanup2: + io_tlb_end = NULL; free_pages((unsigned long)io_tlb_start, order); io_tlb_start = NULL; cleanup1: @@ -433,7 +440,7 @@ void * swiotlb_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t flags) { - unsigned long dev_addr; + dma_addr_t dev_addr; void *ret; int order = get_order(size); @@ -473,8 +480,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size, /* Confirm address can be DMA'd by device */ if (address_needs_mapping(hwdev, dev_addr)) { - printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016lx\n", - (unsigned long long)*hwdev->dma_mask, dev_addr); + printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", + (unsigned long long)*hwdev->dma_mask, + (unsigned long long)dev_addr); panic("swiotlb_alloc_coherent: allocated memory is out of " "range for device"); } @@ -504,7 +512,7 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) * When the mapping is small enough return a static buffer to limit * the damage, or panic when the transfer is too big. */ - printk(KERN_ERR "DMA: Out of SW-IOMMU space for %lu bytes at " + printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at " "device %s\n", size, dev ? dev->bus_id : "?"); if (size > io_tlb_overflow && do_panic) { @@ -525,7 +533,7 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir) { - unsigned long dev_addr = virt_to_bus(ptr); + dma_addr_t dev_addr = virt_to_bus(ptr); void *map; BUG_ON(dir == DMA_NONE); @@ -669,7 +677,7 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems, int dir) { void *addr; - unsigned long dev_addr; + dma_addr_t dev_addr; int i; BUG_ON(dir == DMA_NONE); @@ -765,7 +773,7 @@ swiotlb_dma_mapping_error(dma_addr_t dma_addr) * this function. */ int -swiotlb_dma_supported (struct device *hwdev, u64 mask) +swiotlb_dma_supported(struct device *hwdev, u64 mask) { return virt_to_bus(io_tlb_end - 1) <= mask; } |