| /* |
| * Dynamic DMA mapping support. |
| * |
| * This implementation is for IA-64 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> |
| * Copyright (C) 2000, 2003 Hewlett-Packard Co |
| * David Mosberger-Tang <davidm@hpl.hp.com> |
| * |
| * 03/05/07 davidm Switch from PCI-DMA to generic device DMA API. |
| * 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid |
| * unnecessary i-cache flushing. |
| * 04/07/.. ak Better overflow handling. Assorted fixes. |
| */ |
| |
| #include <linux/cache.h> |
| #include <linux/mm.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/spinlock.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/ctype.h> |
| |
| #include <asm/io.h> |
| #include <asm/pci.h> |
| #include <asm/dma.h> |
| |
| #include <linux/init.h> |
| #include <linux/bootmem.h> |
| |
| #define OFFSET(val,align) ((unsigned long) \ |
| ( (val) & ( (align) - 1))) |
| |
| #define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset) |
| #define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG)) |
| |
| /* |
| * Maximum allowable number of contiguous slabs to map, |
| * must be a power of 2. What is the appropriate value ? |
| * The complexity of {map,unmap}_single is linearly dependent on this value. |
| */ |
| #define IO_TLB_SEGSIZE 128 |
| |
| /* |
| * log of the size of each IO TLB slab. The number of slabs is command line |
| * controllable. |
| */ |
| #define IO_TLB_SHIFT 11 |
| |
| int swiotlb_force; |
| |
| /* |
| * Used to do a quick range check in swiotlb_unmap_single and |
| * swiotlb_sync_single_*, to see if the memory was in fact allocated by this |
| * API. |
| */ |
| static char *io_tlb_start, *io_tlb_end; |
| |
| /* |
| * The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and |
| * io_tlb_end. This is command line adjustable via setup_io_tlb_npages. |
| */ |
| static unsigned long io_tlb_nslabs; |
| |
| /* |
| * When the IOMMU overflows we return a fallback buffer. This sets the size. |
| */ |
| static unsigned long io_tlb_overflow = 32*1024; |
| |
| void *io_tlb_overflow_buffer; |
| |
| /* |
| * This is a free list describing the number of free entries available from |
| * each index |
| */ |
| static unsigned int *io_tlb_list; |
| static unsigned int io_tlb_index; |
| |
| /* |
| * We need to save away the original address corresponding to a mapped entry |
| * for the sync operations. |
| */ |
| static unsigned char **io_tlb_orig_addr; |
| |
| /* |
| * Protect the above data structures in the map and unmap calls |
| */ |
| static DEFINE_SPINLOCK(io_tlb_lock); |
| |
| static int __init |
| setup_io_tlb_npages(char *str) |
| { |
| if (isdigit(*str)) { |
| io_tlb_nslabs = simple_strtoul(str, &str, 0); |
| /* avoid tail segment of size < IO_TLB_SEGSIZE */ |
| io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| } |
| if (*str == ',') |
| ++str; |
| if (!strcmp(str, "force")) |
| swiotlb_force = 1; |
| return 1; |
| } |
| __setup("swiotlb=", setup_io_tlb_npages); |
| /* make io_tlb_overflow tunable too? */ |
| |
| /* |
| * Statically reserve bounce buffer space and initialize bounce buffer data |
| * structures for the software IO TLB used to implement the PCI DMA API. |
| */ |
| void |
| swiotlb_init_with_default_size (size_t default_size) |
| { |
| unsigned long i; |
| |
| if (!io_tlb_nslabs) { |
| io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); |
| io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| } |
| |
| /* |
| * Get IO TLB memory from the low pages |
| */ |
| io_tlb_start = alloc_bootmem_low_pages_limit(io_tlb_nslabs * |
| (1 << IO_TLB_SHIFT), 0x100000000); |
| if (!io_tlb_start) |
| panic("Cannot allocate SWIOTLB buffer"); |
| io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT); |
| |
| /* |
| * Allocate and initialize the free list array. This array is used |
| * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE |
| * between io_tlb_start and io_tlb_end. |
| */ |
| io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int)); |
| for (i = 0; i < io_tlb_nslabs; i++) |
| io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); |
| io_tlb_index = 0; |
| io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *)); |
| |
| /* |
| * Get the overflow emergency buffer |
| */ |
| io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); |
| printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n", |
| virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end)); |
| } |
| |
| void |
| swiotlb_init (void) |
| { |
| swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */ |
| } |
| |
| static inline int |
| address_needs_mapping(struct device *hwdev, dma_addr_t addr) |
| { |
| dma_addr_t mask = 0xffffffff; |
| /* If the device has a mask, use it, otherwise default to 32 bits */ |
| if (hwdev && hwdev->dma_mask) |
| mask = *hwdev->dma_mask; |
| return (addr & ~mask) != 0; |
| } |
| |
| /* |
| * Allocates bounce buffer and returns its kernel virtual address. |
| */ |
| static void * |
| map_single(struct device *hwdev, char *buffer, size_t size, int dir) |
| { |
| unsigned long flags; |
| char *dma_addr; |
| unsigned int nslots, stride, index, wrap; |
| int i; |
| |
| /* |
| * For mappings greater than a page, we limit the stride (and |
| * hence alignment) to a page size. |
| */ |
| nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
| if (size > PAGE_SIZE) |
| stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT)); |
| else |
| stride = 1; |
| |
| if (!nslots) |
| BUG(); |
| |
| /* |
| * Find suitable number of IO TLB entries size that will fit this |
| * request and allocate a buffer from that IO TLB pool. |
| */ |
| spin_lock_irqsave(&io_tlb_lock, flags); |
| { |
| wrap = index = ALIGN(io_tlb_index, stride); |
| |
| if (index >= io_tlb_nslabs) |
| wrap = index = 0; |
| |
| do { |
| /* |
| * If we find a slot that indicates we have 'nslots' |
| * number of contiguous buffers, we allocate the |
| * buffers from that slot and mark the entries as '0' |
| * indicating unavailable. |
| */ |
| if (io_tlb_list[index] >= nslots) { |
| int count = 0; |
| |
| for (i = index; i < (int) (index + nslots); i++) |
| io_tlb_list[i] = 0; |
| for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) |
| io_tlb_list[i] = ++count; |
| dma_addr = io_tlb_start + (index << IO_TLB_SHIFT); |
| |
| /* |
| * Update the indices to avoid searching in |
| * the next round. |
| */ |
| io_tlb_index = ((index + nslots) < io_tlb_nslabs |
| ? (index + nslots) : 0); |
| |
| goto found; |
| } |
| index += stride; |
| if (index >= io_tlb_nslabs) |
| index = 0; |
| } while (index != wrap); |
| |
| spin_unlock_irqrestore(&io_tlb_lock, flags); |
| return NULL; |
| } |
| found: |
| spin_unlock_irqrestore(&io_tlb_lock, flags); |
| |
| /* |
| * Save away the mapping from the original address to the DMA address. |
| * This is needed when we sync the memory. Then we sync the buffer if |
| * needed. |
| */ |
| io_tlb_orig_addr[index] = buffer; |
| if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) |
| memcpy(dma_addr, buffer, size); |
| |
| return dma_addr; |
| } |
| |
| /* |
| * dma_addr is the kernel virtual address of the bounce buffer to unmap. |
| */ |
| static void |
| unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) |
| { |
| unsigned long flags; |
| int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
| int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
| char *buffer = io_tlb_orig_addr[index]; |
| |
| /* |
| * First, sync the memory before unmapping the entry |
| */ |
| if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) |
| /* |
| * bounce... copy the data back into the original buffer * and |
| * delete the bounce buffer. |
| */ |
| memcpy(buffer, dma_addr, size); |
| |
| /* |
| * Return the buffer to the free list by setting the corresponding |
| * entries to indicate the number of contigous entries available. |
| * While returning the entries to the free list, we merge the entries |
| * with slots below and above the pool being returned. |
| */ |
| spin_lock_irqsave(&io_tlb_lock, flags); |
| { |
| count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ? |
| io_tlb_list[index + nslots] : 0); |
| /* |
| * Step 1: return the slots to the free list, merging the |
| * slots with superceeding slots |
| */ |
| for (i = index + nslots - 1; i >= index; i--) |
| io_tlb_list[i] = ++count; |
| /* |
| * Step 2: merge the returned slots with the preceding slots, |
| * if available (non zero) |
| */ |
| for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) |
| io_tlb_list[i] = ++count; |
| } |
| spin_unlock_irqrestore(&io_tlb_lock, flags); |
| } |
| |
| static void |
| sync_single(struct device *hwdev, char *dma_addr, size_t size, int dir) |
| { |
| int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
| char *buffer = io_tlb_orig_addr[index]; |
| |
| /* |
| * bounce... copy the data back into/from the original buffer |
| * XXX How do you handle DMA_BIDIRECTIONAL here ? |
| */ |
| if (dir == DMA_FROM_DEVICE) |
| memcpy(buffer, dma_addr, size); |
| else if (dir == DMA_TO_DEVICE) |
| memcpy(dma_addr, buffer, size); |
| else |
| BUG(); |
| } |
| |
| void * |
| swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
| dma_addr_t *dma_handle, int flags) |
| { |
| unsigned long dev_addr; |
| void *ret; |
| int order = get_order(size); |
| |
| /* |
| * XXX fix me: the DMA API should pass us an explicit DMA mask |
| * instead, or use ZONE_DMA32 (ia64 overloads ZONE_DMA to be a ~32 |
| * bit range instead of a 16MB one). |
| */ |
| flags |= GFP_DMA; |
| |
| ret = (void *)__get_free_pages(flags, order); |
| if (ret && address_needs_mapping(hwdev, virt_to_phys(ret))) { |
| /* |
| * The allocated memory isn't reachable by the device. |
| * Fall back on swiotlb_map_single(). |
| */ |
| free_pages((unsigned long) ret, order); |
| ret = NULL; |
| } |
| if (!ret) { |
| /* |
| * We are either out of memory or the device can't DMA |
| * to GFP_DMA memory; fall back on |
| * swiotlb_map_single(), which will grab memory from |
| * the lowest available address range. |
| */ |
| dma_addr_t handle; |
| handle = swiotlb_map_single(NULL, NULL, size, DMA_FROM_DEVICE); |
| if (dma_mapping_error(handle)) |
| return NULL; |
| |
| ret = phys_to_virt(handle); |
| } |
| |
| memset(ret, 0, size); |
| dev_addr = virt_to_phys(ret); |
| |
| /* 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); |
| panic("swiotlb_alloc_coherent: allocated memory is out of " |
| "range for device"); |
| } |
| *dma_handle = dev_addr; |
| return ret; |
| } |
| |
| void |
| swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, |
| dma_addr_t dma_handle) |
| { |
| if (!(vaddr >= (void *)io_tlb_start |
| && vaddr < (void *)io_tlb_end)) |
| free_pages((unsigned long) vaddr, get_order(size)); |
| else |
| /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ |
| swiotlb_unmap_single (hwdev, dma_handle, size, DMA_TO_DEVICE); |
| } |
| |
| static void |
| swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) |
| { |
| /* |
| * Ran out of IOMMU space for this operation. This is very bad. |
| * Unfortunately the drivers cannot handle this operation properly. |
| * unless they check for pci_dma_mapping_error (most don't) |
| * 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 "PCI-DMA: Out of SW-IOMMU space for %lu bytes at " |
| "device %s\n", size, dev ? dev->bus_id : "?"); |
| |
| if (size > io_tlb_overflow && do_panic) { |
| if (dir == PCI_DMA_FROMDEVICE || dir == PCI_DMA_BIDIRECTIONAL) |
| panic("PCI-DMA: Memory would be corrupted\n"); |
| if (dir == PCI_DMA_TODEVICE || dir == PCI_DMA_BIDIRECTIONAL) |
| panic("PCI-DMA: Random memory would be DMAed\n"); |
| } |
| } |
| |
| /* |
| * Map a single buffer of the indicated size for DMA in streaming mode. The |
| * PCI address to use is returned. |
| * |
| * Once the device is given the dma address, the device owns this memory until |
| * either swiotlb_unmap_single or swiotlb_dma_sync_single is performed. |
| */ |
| dma_addr_t |
| swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir) |
| { |
| unsigned long dev_addr = virt_to_phys(ptr); |
| void *map; |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| /* |
| * If the pointer passed in happens to be in the device's DMA window, |
| * we can safely return the device addr and not worry about bounce |
| * buffering it. |
| */ |
| if (!address_needs_mapping(hwdev, dev_addr) && !swiotlb_force) |
| return dev_addr; |
| |
| /* |
| * Oh well, have to allocate and map a bounce buffer. |
| */ |
| map = map_single(hwdev, ptr, size, dir); |
| if (!map) { |
| swiotlb_full(hwdev, size, dir, 1); |
| map = io_tlb_overflow_buffer; |
| } |
| |
| dev_addr = virt_to_phys(map); |
| |
| /* |
| * Ensure that the address returned is DMA'ble |
| */ |
| if (address_needs_mapping(hwdev, dev_addr)) |
| panic("map_single: bounce buffer is not DMA'ble"); |
| |
| return dev_addr; |
| } |
| |
| /* |
| * Since DMA is i-cache coherent, any (complete) pages that were written via |
| * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to |
| * flush them when they get mapped into an executable vm-area. |
| */ |
| static void |
| mark_clean(void *addr, size_t size) |
| { |
| unsigned long pg_addr, end; |
| |
| pg_addr = PAGE_ALIGN((unsigned long) addr); |
| end = (unsigned long) addr + size; |
| while (pg_addr + PAGE_SIZE <= end) { |
| struct page *page = virt_to_page(pg_addr); |
| set_bit(PG_arch_1, &page->flags); |
| pg_addr += PAGE_SIZE; |
| } |
| } |
| |
| /* |
| * Unmap a single streaming mode DMA translation. The dma_addr and size must |
| * match what was provided for in a previous swiotlb_map_single call. All |
| * other usages are undefined. |
| * |
| * After this call, reads by the cpu to the buffer are guaranteed to see |
| * whatever the device wrote there. |
| */ |
| void |
| swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size, |
| int dir) |
| { |
| char *dma_addr = phys_to_virt(dev_addr); |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end) |
| unmap_single(hwdev, dma_addr, size, dir); |
| else if (dir == DMA_FROM_DEVICE) |
| mark_clean(dma_addr, size); |
| } |
| |
| /* |
| * Make physical memory consistent for a single streaming mode DMA translation |
| * after a transfer. |
| * |
| * If you perform a swiotlb_map_single() but wish to interrogate the buffer |
| * using the cpu, yet do not wish to teardown the PCI dma mapping, you must |
| * call this function before doing so. At the next point you give the PCI dma |
| * address back to the card, you must first perform a |
| * swiotlb_dma_sync_for_device, and then the device again owns the buffer |
| */ |
| void |
| swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
| size_t size, int dir) |
| { |
| char *dma_addr = phys_to_virt(dev_addr); |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end) |
| sync_single(hwdev, dma_addr, size, dir); |
| else if (dir == DMA_FROM_DEVICE) |
| mark_clean(dma_addr, size); |
| } |
| |
| void |
| swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, |
| size_t size, int dir) |
| { |
| char *dma_addr = phys_to_virt(dev_addr); |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end) |
| sync_single(hwdev, dma_addr, size, dir); |
| else if (dir == DMA_FROM_DEVICE) |
| mark_clean(dma_addr, size); |
| } |
| |
| /* |
| * Map a set of buffers described by scatterlist in streaming mode for DMA. |
| * This is the scatter-gather version of the above swiotlb_map_single |
| * interface. Here the scatter gather list elements are each tagged with the |
| * appropriate dma address and length. They are obtained via |
| * sg_dma_{address,length}(SG). |
| * |
| * NOTE: An implementation may be able to use a smaller number of |
| * DMA address/length pairs than there are SG table elements. |
| * (for example via virtual mapping capabilities) |
| * The routine returns the number of addr/length pairs actually |
| * used, at most nents. |
| * |
| * Device ownership issues as mentioned above for swiotlb_map_single are the |
| * same here. |
| */ |
| int |
| swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems, |
| int dir) |
| { |
| void *addr; |
| unsigned long dev_addr; |
| int i; |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| |
| for (i = 0; i < nelems; i++, sg++) { |
| addr = SG_ENT_VIRT_ADDRESS(sg); |
| dev_addr = virt_to_phys(addr); |
| if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) { |
| sg->dma_address = (dma_addr_t) virt_to_phys(map_single(hwdev, addr, sg->length, dir)); |
| if (!sg->dma_address) { |
| /* Don't panic here, we expect map_sg users |
| to do proper error handling. */ |
| swiotlb_full(hwdev, sg->length, dir, 0); |
| swiotlb_unmap_sg(hwdev, sg - i, i, dir); |
| sg[0].dma_length = 0; |
| return 0; |
| } |
| } else |
| sg->dma_address = dev_addr; |
| sg->dma_length = sg->length; |
| } |
| return nelems; |
| } |
| |
| /* |
| * Unmap a set of streaming mode DMA translations. Again, cpu read rules |
| * concerning calls here are the same as for swiotlb_unmap_single() above. |
| */ |
| void |
| swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems, |
| int dir) |
| { |
| int i; |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| |
| for (i = 0; i < nelems; i++, sg++) |
| if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg)) |
| unmap_single(hwdev, (void *) phys_to_virt(sg->dma_address), sg->dma_length, dir); |
| else if (dir == DMA_FROM_DEVICE) |
| mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length); |
| } |
| |
| /* |
| * Make physical memory consistent for a set of streaming mode DMA translations |
| * after a transfer. |
| * |
| * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules |
| * and usage. |
| */ |
| void |
| swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
| int nelems, int dir) |
| { |
| int i; |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| |
| for (i = 0; i < nelems; i++, sg++) |
| if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg)) |
| sync_single(hwdev, (void *) sg->dma_address, |
| sg->dma_length, dir); |
| } |
| |
| void |
| swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
| int nelems, int dir) |
| { |
| int i; |
| |
| if (dir == DMA_NONE) |
| BUG(); |
| |
| for (i = 0; i < nelems; i++, sg++) |
| if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg)) |
| sync_single(hwdev, (void *) sg->dma_address, |
| sg->dma_length, dir); |
| } |
| |
| int |
| swiotlb_dma_mapping_error(dma_addr_t dma_addr) |
| { |
| return (dma_addr == virt_to_phys(io_tlb_overflow_buffer)); |
| } |
| |
| /* |
| * Return whether the given PCI device DMA address mask can be supported |
| * properly. For example, if your device can only drive the low 24-bits |
| * during PCI bus mastering, then you would pass 0x00ffffff as the mask to |
| * this function. |
| */ |
| int |
| swiotlb_dma_supported (struct device *hwdev, u64 mask) |
| { |
| return (virt_to_phys (io_tlb_end) - 1) <= mask; |
| } |
| |
| EXPORT_SYMBOL(swiotlb_init); |
| EXPORT_SYMBOL(swiotlb_map_single); |
| EXPORT_SYMBOL(swiotlb_unmap_single); |
| EXPORT_SYMBOL(swiotlb_map_sg); |
| EXPORT_SYMBOL(swiotlb_unmap_sg); |
| EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); |
| EXPORT_SYMBOL(swiotlb_sync_single_for_device); |
| EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); |
| EXPORT_SYMBOL(swiotlb_sync_sg_for_device); |
| EXPORT_SYMBOL(swiotlb_dma_mapping_error); |
| EXPORT_SYMBOL(swiotlb_alloc_coherent); |
| EXPORT_SYMBOL(swiotlb_free_coherent); |
| EXPORT_SYMBOL(swiotlb_dma_supported); |