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[Xen-devel] [PATCH 10/11] [swiotlb] Rename swiotlb.c to swiotlb-core.c



From: Konrad Rzeszutek <konrad@xxxxxxxxxxxxxxxxxxxxx>

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 include/linux/swiotlb.h |    5 +-
 lib/Makefile            |    2 +-
 lib/swiotlb-core.c      |  957 +++++++++++++++++++++++++++++++++++++++++++++++
 lib/swiotlb.c           |  957 -----------------------------------------------
 4 files changed, 961 insertions(+), 960 deletions(-)
 create mode 100644 lib/swiotlb-core.c
 delete mode 100644 lib/swiotlb.c

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index af66473..6ab9b7c 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -22,6 +22,7 @@ extern int swiotlb_force;
  */
 #define IO_TLB_SHIFT 11
 
+/* swiotlb-core.c */
 extern void swiotlb_init(int verbose);
 #ifdef CONFIG_SWIOTLB
 extern void __init swiotlb_free(void);
@@ -30,8 +31,8 @@ static inline void swiotlb_free(void) { }
 #endif
 extern void swiotlb_print_info(void);
 
-/* Internal book-keeping functions. Must be linked against the library
- * to take advantage of them.*/
+/* swiotlb-core.c: Internal book-keeping functions.
+ * Must be linked against the library to take advantage of them.*/
 #ifdef CONFIG_SWIOTLB
 /*
  * Enumeration for sync targets
diff --git a/lib/Makefile b/lib/Makefile
index 3b0b4a6..40728c5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -78,7 +78,7 @@ obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
 obj-$(CONFIG_SMP) += percpu_counter.o
 obj-$(CONFIG_AUDIT_GENERIC) += audit.o
 
-obj-$(CONFIG_SWIOTLB) += swiotlb.o
+obj-$(CONFIG_SWIOTLB) += swiotlb-core.o swiotlb.o
 obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
 obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
 
diff --git a/lib/swiotlb-core.c b/lib/swiotlb-core.c
new file mode 100644
index 0000000..c982d33
--- /dev/null
+++ b/lib/swiotlb-core.c
@@ -0,0 +1,957 @@
+/*
+ * Dynamic DMA mapping 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@xxxxxxxxx>
+ * Copyright (C) 2000 Goutham Rao <goutham.rao@xxxxxxxxx>
+ * Copyright (C) 2000, 2003 Hewlett-Packard Co
+ *     David Mosberger-Tang <davidm@xxxxxxxxxx>
+ *
+ * 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.
+ * 05/09/10 linville   Add support for syncing ranges, support syncing for
+ *                     DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
+ * 08/12/11 beckyb     Add highmem support
+ */
+
+#include <linux/cache.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/swiotlb.h>
+#include <linux/pfn.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/highmem.h>
+
+#include <linux/io.h>
+#include <asm/dma.h>
+#include <linux/scatterlist.h>
+
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/iommu-helper.h>
+
+#define OFFSET(val, align) ((unsigned long)    ((val) & ((align) - 1)))
+
+#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
+
+/*
+ * Minimum IO TLB size to bother booting with.  Systems with mainly
+ * 64bit capable cards will only lightly use the swiotlb.  If we can't
+ * allocate a contiguous 1MB, we're probably in trouble anyway.
+ */
+#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
+
+int swiotlb_force;
+
+/*
+ * Used to do a quick range check in do_unmap_single and
+ * do_sync_single_*, to see if the memory was in fact allocated by this
+ * API.
+ */
+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.
+ */
+unsigned long io_tlb_nslabs;
+
+/*
+ * When the IOMMU overflows we return a fallback buffer. This sets the size.
+ */
+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 phys_addr_t *io_tlb_orig_addr;
+
+/*
+ * Protect the above data structures in the map and unmap calls
+ */
+static DEFINE_SPINLOCK(io_tlb_lock);
+
+static int late_alloc;
+
+static int __init
+setup_io_tlb_npages(char *str)
+{
+       int get_value(const char *token, char *str, char **endp)
+       {
+               ssize_t len;
+               int val = 0;
+
+               len = strlen(token);
+               if (!strncmp(str, token, len)) {
+                       str += len;
+                       if (*str == '=')
+                               ++str;
+                       if (*str != '\0')
+                               val = simple_strtoul(str, endp, 0);
+               }
+               *endp = str;
+               return val;
+       }
+
+       int val;
+
+       while (*str) {
+               /* The old syntax */
+               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 (!strncmp(str, "force", 5))
+                       swiotlb_force = 1;
+               /* The new syntax: swiotlb=nslabs=16384,overflow=32768,force */
+               val = get_value("nslabs", str, &str);
+               if (val)
+                       io_tlb_nslabs = ALIGN(val, IO_TLB_SEGSIZE);
+
+               val = get_value("overflow", str, &str);
+               if (val)
+                       io_tlb_overflow = val;
+               str = strpbrk(str, ",");
+               if (!str)
+                       break;
+               str++; /* skip ',' */
+       }
+       return 1;
+}
+__setup("swiotlb=", setup_io_tlb_npages);
+
+/* Note that this doesn't work with highmem page */
+static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
+                                     volatile void *address)
+{
+       return phys_to_dma(hwdev, virt_to_phys(address));
+}
+
+void swiotlb_print_info(void)
+{
+       unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+       phys_addr_t pstart, pend;
+
+       pstart = virt_to_phys(io_tlb_start);
+       pend = virt_to_phys(io_tlb_end);
+
+       printk(KERN_INFO "DMA: Placing %luMB software IO TLB between %p - %p\n",
+              bytes >> 20, io_tlb_start, io_tlb_end);
+       printk(KERN_INFO "DMA: software IO TLB at phys %#llx - %#llx\n",
+              (unsigned long long)pstart,
+              (unsigned long long)pend);
+}
+
+/*
+ * Statically reserve bounce buffer space and initialize bounce buffer data
+ * structures for the software IO TLB used to implement the DMA API.
+ */
+void __init
+swiotlb_init_early(size_t default_size, int verbose)
+{
+       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(bytes);
+       if (!io_tlb_start)
+               panic("DMA: Cannot allocate SWIOTLB buffer");
+       io_tlb_end = io_tlb_start + bytes;
+
+       /*
+        * 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(phys_addr_t));
+
+       /*
+        * Get the overflow emergency buffer
+        */
+       io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
+       if (!io_tlb_overflow_buffer)
+               panic("DMA: Cannot allocate SWIOTLB overflow buffer!\n");
+       if (verbose)
+               swiotlb_print_info();
+}
+
+void __init
+swiotlb_init(int verbose)
+{
+       swiotlb_init_early(64 * (1<<20), verbose);      /* default to 64MB */
+}
+
+/*
+ * Systems with larger DMA zones (those that don't support ISA) can
+ * initialize the swiotlb later using the slab allocator if needed.
+ * This should be just like above, but with some error catching.
+ */
+int
+swiotlb_init_late(size_t default_size)
+{
+       unsigned long i, bytes, req_nslabs = io_tlb_nslabs;
+       unsigned int order;
+
+       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
+        */
+       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 = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
+                                                       order);
+               if (io_tlb_start)
+                       break;
+               order--;
+       }
+
+       if (!io_tlb_start)
+               goto cleanup1;
+
+       if (order != get_order(bytes)) {
+               printk(KERN_WARNING "DMA: 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 + bytes;
+       memset(io_tlb_start, 0, bytes);
+
+       /*
+        * 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 = (unsigned int *)__get_free_pages(GFP_KERNEL,
+                                       get_order(io_tlb_nslabs * sizeof(int)));
+       if (!io_tlb_list)
+               goto cleanup2;
+
+       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 = (phys_addr_t *) __get_free_pages(GFP_KERNEL,
+                               get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
+       if (!io_tlb_orig_addr)
+               goto cleanup3;
+
+       memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
+
+       /*
+        * Get the overflow emergency buffer
+        */
+       io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
+                                        get_order(io_tlb_overflow));
+       if (!io_tlb_overflow_buffer)
+               goto cleanup4;
+
+       swiotlb_print_info();
+
+       late_alloc = 1;
+
+       return 0;
+
+cleanup4:
+       free_pages((unsigned long)io_tlb_orig_addr,
+                  get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
+       io_tlb_orig_addr = NULL;
+cleanup3:
+       free_pages((unsigned long)io_tlb_list,
+                  get_order(io_tlb_nslabs * sizeof(int)));
+       io_tlb_list = NULL;
+cleanup2:
+       io_tlb_end = NULL;
+       free_pages((unsigned long)io_tlb_start, order);
+       io_tlb_start = NULL;
+cleanup1:
+       io_tlb_nslabs = req_nslabs;
+       return -ENOMEM;
+}
+
+void __init swiotlb_free(void)
+{
+       if (!io_tlb_overflow_buffer)
+               return;
+
+       if (late_alloc) {
+               free_pages((unsigned long)io_tlb_overflow_buffer,
+                          get_order(io_tlb_overflow));
+               free_pages((unsigned long)io_tlb_orig_addr,
+                          get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
+               free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
+                                                                sizeof(int)));
+               free_pages((unsigned long)io_tlb_start,
+                          get_order(io_tlb_nslabs << IO_TLB_SHIFT));
+       } else {
+               free_bootmem_late(__pa(io_tlb_overflow_buffer),
+                                 io_tlb_overflow);
+               free_bootmem_late(__pa(io_tlb_orig_addr),
+                                 io_tlb_nslabs * sizeof(phys_addr_t));
+               free_bootmem_late(__pa(io_tlb_list),
+                                 io_tlb_nslabs * sizeof(int));
+               free_bootmem_late(__pa(io_tlb_start),
+                                 io_tlb_nslabs << IO_TLB_SHIFT);
+       }
+}
+
+int is_swiotlb_buffer(phys_addr_t paddr)
+{
+       return paddr >= virt_to_phys(io_tlb_start) &&
+               paddr < virt_to_phys(io_tlb_end);
+}
+
+/*
+ * 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)
+{
+       unsigned long pfn = PFN_DOWN(phys);
+
+       if (PageHighMem(pfn_to_page(pfn))) {
+               /* The buffer does not have a mapping.  Map it in and copy */
+               unsigned int offset = phys & ~PAGE_MASK;
+               char *buffer;
+               unsigned int sz = 0;
+               unsigned long flags;
+
+               while (size) {
+                       sz = min_t(size_t, PAGE_SIZE - offset, size);
+
+                       local_irq_save(flags);
+                       buffer = kmap_atomic(pfn_to_page(pfn),
+                                            KM_BOUNCE_READ);
+                       if (dir == DMA_TO_DEVICE)
+                               memcpy(dma_addr, buffer + offset, sz);
+                       else
+                               memcpy(buffer + offset, dma_addr, sz);
+                       kunmap_atomic(buffer, KM_BOUNCE_READ);
+                       local_irq_restore(flags);
+
+                       size -= sz;
+                       pfn++;
+                       dma_addr += sz;
+                       offset = 0;
+               }
+       } else {
+               if (dir == DMA_TO_DEVICE)
+                       memcpy(dma_addr, phys_to_virt(phys), size);
+               else
+                       memcpy(phys_to_virt(phys), dma_addr, size);
+       }
+}
+
+/*
+ * Allocates bounce buffer and returns its kernel virtual address.
+ */
+void *
+do_map_single(struct device *hwdev, phys_addr_t phys,
+              unsigned long start_dma_addr, size_t size, int dir)
+{
+       unsigned long flags;
+       char *dma_addr;
+       unsigned int nslots, stride, index, wrap;
+       int i;
+       unsigned long mask;
+       unsigned long offset_slots;
+       unsigned long max_slots;
+
+       mask = dma_get_seg_boundary(hwdev);
+       start_dma_addr = start_dma_addr & mask;
+       offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+
+       /*
+        * Carefully handle integer overflow which can occur when mask == ~0UL.
+        */
+       max_slots = mask + 1
+                   ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
+                   : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
+
+       /*
+        * 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;
+
+       BUG_ON(!nslots);
+
+       /*
+        * 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);
+       index = ALIGN(io_tlb_index, stride);
+       if (index >= io_tlb_nslabs)
+               index = 0;
+       wrap = index;
+
+       do {
+               while (iommu_is_span_boundary(index, nslots, offset_slots,
+                                             max_slots)) {
+                       index += stride;
+                       if (index >= io_tlb_nslabs)
+                               index = 0;
+                       if (index == wrap)
+                               goto not_found;
+               }
+
+               /*
+                * 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);
+
+not_found:
+       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.
+        */
+       for (i = 0; i < nslots; i++)
+               io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT);
+       if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
+               swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
+
+       return dma_addr;
+}
+
+/*
+ * dma_addr is the kernel virtual address of the bounce buffer to unmap.
+ */
+void
+do_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;
+       phys_addr_t phys = 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);
+
+       /*
+        * Return the buffer to the free list by setting the corresponding
+        * entries to indicate the number of contiguous 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);
+}
+
+void
+do_sync_single(struct device *hwdev, char *dma_addr, size_t size,
+           int dir, int target)
+{
+       int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
+       phys_addr_t phys = io_tlb_orig_addr[index];
+
+       phys += ((unsigned long)dma_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);
+               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);
+               else
+                       BUG_ON(dir != DMA_FROM_DEVICE);
+               break;
+       default:
+               BUG();
+       }
+}
+
+void *
+swiotlb_alloc_coherent(struct device *hwdev, size_t size,
+                      dma_addr_t *dma_handle, gfp_t flags)
+{
+       dma_addr_t dev_addr;
+       void *ret;
+       int order = get_order(size);
+       u64 dma_mask = DMA_BIT_MASK(32);
+       unsigned long start_dma_addr;
+
+       if (hwdev && hwdev->coherent_dma_mask)
+               dma_mask = hwdev->coherent_dma_mask;
+
+       ret = (void *)__get_free_pages(flags, order);
+       if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) {
+               /*
+                * The allocated memory isn't reachable by the device.
+                */
+               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 do_map_single(), which
+                * will grab memory from the lowest available address range.
+                */
+               start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
+               ret = do_map_single(hwdev, 0, start_dma_addr, size,
+                                   DMA_FROM_DEVICE);
+               if (!ret)
+                       return NULL;
+       }
+
+       memset(ret, 0, size);
+       dev_addr = swiotlb_virt_to_bus(hwdev, ret);
+
+       /* Confirm address can be DMA'd by device */
+       if (dev_addr + size - 1 > dma_mask) {
+               dev_err(hwdev, "DMA: 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 do_unmap_single */
+               do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
+               return NULL;
+       }
+       *dma_handle = dev_addr;
+       return ret;
+}
+EXPORT_SYMBOL(swiotlb_alloc_coherent);
+
+void
+swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
+                     dma_addr_t dev_addr)
+{
+       phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
+       WARN_ON(irqs_disabled());
+       if (!is_swiotlb_buffer(paddr))
+               free_pages((unsigned long)vaddr, get_order(size));
+       else
+               /* DMA_TO_DEVICE to avoid memcpy in do_unmap_single */
+               do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL(swiotlb_free_coherent);
+
+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 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.
+        */
+       dev_err(dev, "DMA: Out of SW-IOMMU space for %zu bytes.", size);
+
+       if (size <= io_tlb_overflow || !do_panic)
+               return;
+
+       if (dir == DMA_BIDIRECTIONAL)
+               panic("DMA: Random memory could be DMA accessed\n");
+       if (dir == DMA_FROM_DEVICE)
+               panic("DMA: Random memory could be DMA written\n");
+       if (dir == DMA_TO_DEVICE)
+               panic("DMA: Random memory could be DMA read\n");
+}
+
+/*
+ * Map a single buffer of the indicated size for DMA in streaming mode.  The
+ * physical address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory until
+ * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
+ */
+dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
+                           unsigned long offset, size_t size,
+                           enum dma_data_direction dir,
+                           struct dma_attrs *attrs)
+{
+       unsigned long start_dma_addr;
+       phys_addr_t phys = page_to_phys(page) + offset;
+       dma_addr_t dev_addr = phys_to_dma(dev, phys);
+       void *map;
+
+       BUG_ON(dir == DMA_NONE);
+       /*
+        * If the address happens to be in the device's DMA window,
+        * we can safely return the device addr and not worry about bounce
+        * buffering it.
+        */
+       if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
+               return dev_addr;
+
+       /*
+        * Oh well, have to allocate and map a bounce buffer.
+        */
+       start_dma_addr = swiotlb_virt_to_bus(dev, io_tlb_start);
+       map = do_map_single(dev, phys, start_dma_addr, size, dir);
+       if (!map) {
+               swiotlb_full(dev, size, dir, 1);
+               map = io_tlb_overflow_buffer;
+       }
+
+       dev_addr = swiotlb_virt_to_bus(dev, map);
+
+       /*
+        * Ensure that the address returned is DMA'ble
+        */
+       if (!dma_capable(dev, dev_addr, size))
+               panic("DMA: swiotlb_map_single: bounce buffer is not DMA'ble");
+
+       return dev_addr;
+}
+EXPORT_SYMBOL_GPL(swiotlb_map_page);
+
+/*
+ * Unmap a single streaming mode DMA translation.  The dma_addr and size must
+ * match what was provided for in a previous swiotlb_map_page 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.
+ */
+static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
+                        size_t size, int dir)
+{
+       phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
+       BUG_ON(dir == DMA_NONE);
+
+       if (is_swiotlb_buffer(paddr)) {
+               do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
+               return;
+       }
+
+       if (dir != DMA_FROM_DEVICE)
+               return;
+
+       /*
+        * phys_to_virt doesn't work with hihgmem page but we could
+        * call dma_mark_clean() with hihgmem page here. However, we
+        * are fine since dma_mark_clean() is null on POWERPC. We can
+        * make dma_mark_clean() take a physical address if necessary.
+        */
+       dma_mark_clean(phys_to_virt(paddr), size);
+}
+
+void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
+                       size_t size, enum dma_data_direction dir,
+                       struct dma_attrs *attrs)
+{
+       unmap_single(hwdev, dev_addr, size, dir);
+}
+EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
+
+/*
+ * Make physical memory consistent for a single streaming mode DMA translation
+ * after a transfer.
+ *
+ * If you perform a swiotlb_map_page() but wish to interrogate the buffer
+ * using the cpu, yet do not wish to teardown the dma mapping, you must
+ * call this function before doing so.  At the next point you give the dma
+ * address back to the card, you must first perform a
+ * swiotlb_dma_sync_for_device, and then the device again owns the buffer
+ */
+static void
+swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
+                   size_t size, int dir, int target)
+{
+       phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
+       BUG_ON(dir == DMA_NONE);
+
+       if (is_swiotlb_buffer(paddr)) {
+               do_sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
+               return;
+       }
+
+       if (dir != DMA_FROM_DEVICE)
+               return;
+
+       dma_mark_clean(phys_to_virt(paddr), size);
+}
+
+void
+swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+                           size_t size, enum dma_data_direction dir)
+{
+       swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
+}
+EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
+
+void
+swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
+                              size_t size, enum dma_data_direction dir)
+{
+       swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
+}
+EXPORT_SYMBOL(swiotlb_sync_single_for_device);
+
+/*
+ * Same as above, but for a sub-range of the mapping.
+ */
+static void
+swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
+                         unsigned long offset, size_t size,
+                         int dir, int target)
+{
+       swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
+}
+
+void
+swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+                                 unsigned long offset, size_t size,
+                                 enum dma_data_direction dir)
+{
+       swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+                                 SYNC_FOR_CPU);
+}
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
+
+void
+swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
+                                    unsigned long offset, size_t size,
+                                    enum dma_data_direction dir)
+{
+       swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+                                 SYNC_FOR_DEVICE);
+}
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
+
+/*
+ * Map a set of buffers described by scatterlist in streaming mode for DMA.
+ * This is the scatter-gather version of the above swiotlb_map_page
+ * 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_page are the
+ * same here.
+ */
+int
+swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
+                    enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+       unsigned long start_dma_addr;
+       struct scatterlist *sg;
+       int i;
+
+       BUG_ON(dir == DMA_NONE);
+
+       start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
+       for_each_sg(sgl, sg, nelems, i) {
+               phys_addr_t paddr = sg_phys(sg);
+               dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
+
+               if (swiotlb_force ||
+                   !dma_capable(hwdev, dev_addr, sg->length)) {
+                       void *map = do_map_single(hwdev, sg_phys(sg),
+                                                 start_dma_addr,
+                                                 sg->length, dir);
+                       if (!map) {
+                               /* Don't panic here, we expect map_sg users
+                                  to do proper error handling. */
+                               swiotlb_full(hwdev, sg->length, dir, 0);
+                               swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
+                                                      attrs);
+                               sgl[0].dma_length = 0;
+                               return 0;
+                       }
+                       sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
+               } else
+                       sg->dma_address = dev_addr;
+               sg->dma_length = sg->length;
+       }
+       return nelems;
+}
+EXPORT_SYMBOL(swiotlb_map_sg_attrs);
+
+int
+swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
+              int dir)
+{
+       return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
+}
+EXPORT_SYMBOL(swiotlb_map_sg);
+
+/*
+ * Unmap a set of streaming mode DMA translations.  Again, cpu read rules
+ * concerning calls here are the same as for swiotlb_unmap_page() above.
+ */
+void
+swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
+                      int nelems, enum dma_data_direction dir,
+                      struct dma_attrs *attrs)
+{
+       struct scatterlist *sg;
+       int i;
+
+       BUG_ON(dir == DMA_NONE);
+
+       for_each_sg(sgl, sg, nelems, i)
+               unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
+
+}
+EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
+
+void
+swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
+                int dir)
+{
+       return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
+}
+EXPORT_SYMBOL(swiotlb_unmap_sg);
+
+/*
+ * 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.
+ */
+static void
+swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
+               int nelems, int dir, int target)
+{
+       struct scatterlist *sg;
+       int i;
+
+       for_each_sg(sgl, sg, nelems, i)
+               swiotlb_sync_single(hwdev, sg->dma_address,
+                                   sg->dma_length, dir, target);
+}
+
+void
+swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
+                       int nelems, enum dma_data_direction dir)
+{
+       swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
+}
+EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
+
+void
+swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
+                          int nelems, enum dma_data_direction dir)
+{
+       swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
+}
+EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
+
+int
+swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
+{
+       return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer));
+}
+EXPORT_SYMBOL(swiotlb_dma_mapping_error);
+
+/*
+ * Return whether the given device DMA address mask can be supported
+ * properly.  For example, if your device can only drive the low 24-bits
+ * during bus mastering, then you would pass 0x00ffffff as the mask to
+ * this function.
+ */
+int
+swiotlb_dma_supported(struct device *hwdev, u64 mask)
+{
+       return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
+}
+EXPORT_SYMBOL(swiotlb_dma_supported);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
deleted file mode 100644
index c982d33..0000000
--- a/lib/swiotlb.c
+++ /dev/null
@@ -1,957 +0,0 @@
-/*
- * Dynamic DMA mapping 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@xxxxxxxxx>
- * Copyright (C) 2000 Goutham Rao <goutham.rao@xxxxxxxxx>
- * Copyright (C) 2000, 2003 Hewlett-Packard Co
- *     David Mosberger-Tang <davidm@xxxxxxxxxx>
- *
- * 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.
- * 05/09/10 linville   Add support for syncing ranges, support syncing for
- *                     DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
- * 08/12/11 beckyb     Add highmem support
- */
-
-#include <linux/cache.h>
-#include <linux/dma-mapping.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/swiotlb.h>
-#include <linux/pfn.h>
-#include <linux/types.h>
-#include <linux/ctype.h>
-#include <linux/highmem.h>
-
-#include <linux/io.h>
-#include <asm/dma.h>
-#include <linux/scatterlist.h>
-
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/iommu-helper.h>
-
-#define OFFSET(val, align) ((unsigned long)    ((val) & ((align) - 1)))
-
-#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
-
-/*
- * Minimum IO TLB size to bother booting with.  Systems with mainly
- * 64bit capable cards will only lightly use the swiotlb.  If we can't
- * allocate a contiguous 1MB, we're probably in trouble anyway.
- */
-#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
-
-int swiotlb_force;
-
-/*
- * Used to do a quick range check in do_unmap_single and
- * do_sync_single_*, to see if the memory was in fact allocated by this
- * API.
- */
-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.
- */
-unsigned long io_tlb_nslabs;
-
-/*
- * When the IOMMU overflows we return a fallback buffer. This sets the size.
- */
-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 phys_addr_t *io_tlb_orig_addr;
-
-/*
- * Protect the above data structures in the map and unmap calls
- */
-static DEFINE_SPINLOCK(io_tlb_lock);
-
-static int late_alloc;
-
-static int __init
-setup_io_tlb_npages(char *str)
-{
-       int get_value(const char *token, char *str, char **endp)
-       {
-               ssize_t len;
-               int val = 0;
-
-               len = strlen(token);
-               if (!strncmp(str, token, len)) {
-                       str += len;
-                       if (*str == '=')
-                               ++str;
-                       if (*str != '\0')
-                               val = simple_strtoul(str, endp, 0);
-               }
-               *endp = str;
-               return val;
-       }
-
-       int val;
-
-       while (*str) {
-               /* The old syntax */
-               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 (!strncmp(str, "force", 5))
-                       swiotlb_force = 1;
-               /* The new syntax: swiotlb=nslabs=16384,overflow=32768,force */
-               val = get_value("nslabs", str, &str);
-               if (val)
-                       io_tlb_nslabs = ALIGN(val, IO_TLB_SEGSIZE);
-
-               val = get_value("overflow", str, &str);
-               if (val)
-                       io_tlb_overflow = val;
-               str = strpbrk(str, ",");
-               if (!str)
-                       break;
-               str++; /* skip ',' */
-       }
-       return 1;
-}
-__setup("swiotlb=", setup_io_tlb_npages);
-
-/* Note that this doesn't work with highmem page */
-static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
-                                     volatile void *address)
-{
-       return phys_to_dma(hwdev, virt_to_phys(address));
-}
-
-void swiotlb_print_info(void)
-{
-       unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
-       phys_addr_t pstart, pend;
-
-       pstart = virt_to_phys(io_tlb_start);
-       pend = virt_to_phys(io_tlb_end);
-
-       printk(KERN_INFO "DMA: Placing %luMB software IO TLB between %p - %p\n",
-              bytes >> 20, io_tlb_start, io_tlb_end);
-       printk(KERN_INFO "DMA: software IO TLB at phys %#llx - %#llx\n",
-              (unsigned long long)pstart,
-              (unsigned long long)pend);
-}
-
-/*
- * Statically reserve bounce buffer space and initialize bounce buffer data
- * structures for the software IO TLB used to implement the DMA API.
- */
-void __init
-swiotlb_init_early(size_t default_size, int verbose)
-{
-       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(bytes);
-       if (!io_tlb_start)
-               panic("DMA: Cannot allocate SWIOTLB buffer");
-       io_tlb_end = io_tlb_start + bytes;
-
-       /*
-        * 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(phys_addr_t));
-
-       /*
-        * Get the overflow emergency buffer
-        */
-       io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
-       if (!io_tlb_overflow_buffer)
-               panic("DMA: Cannot allocate SWIOTLB overflow buffer!\n");
-       if (verbose)
-               swiotlb_print_info();
-}
-
-void __init
-swiotlb_init(int verbose)
-{
-       swiotlb_init_early(64 * (1<<20), verbose);      /* default to 64MB */
-}
-
-/*
- * Systems with larger DMA zones (those that don't support ISA) can
- * initialize the swiotlb later using the slab allocator if needed.
- * This should be just like above, but with some error catching.
- */
-int
-swiotlb_init_late(size_t default_size)
-{
-       unsigned long i, bytes, req_nslabs = io_tlb_nslabs;
-       unsigned int order;
-
-       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
-        */
-       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 = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
-                                                       order);
-               if (io_tlb_start)
-                       break;
-               order--;
-       }
-
-       if (!io_tlb_start)
-               goto cleanup1;
-
-       if (order != get_order(bytes)) {
-               printk(KERN_WARNING "DMA: 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 + bytes;
-       memset(io_tlb_start, 0, bytes);
-
-       /*
-        * 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 = (unsigned int *)__get_free_pages(GFP_KERNEL,
-                                       get_order(io_tlb_nslabs * sizeof(int)));
-       if (!io_tlb_list)
-               goto cleanup2;
-
-       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 = (phys_addr_t *) __get_free_pages(GFP_KERNEL,
-                               get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
-       if (!io_tlb_orig_addr)
-               goto cleanup3;
-
-       memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
-
-       /*
-        * Get the overflow emergency buffer
-        */
-       io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
-                                        get_order(io_tlb_overflow));
-       if (!io_tlb_overflow_buffer)
-               goto cleanup4;
-
-       swiotlb_print_info();
-
-       late_alloc = 1;
-
-       return 0;
-
-cleanup4:
-       free_pages((unsigned long)io_tlb_orig_addr,
-                  get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
-       io_tlb_orig_addr = NULL;
-cleanup3:
-       free_pages((unsigned long)io_tlb_list,
-                  get_order(io_tlb_nslabs * sizeof(int)));
-       io_tlb_list = NULL;
-cleanup2:
-       io_tlb_end = NULL;
-       free_pages((unsigned long)io_tlb_start, order);
-       io_tlb_start = NULL;
-cleanup1:
-       io_tlb_nslabs = req_nslabs;
-       return -ENOMEM;
-}
-
-void __init swiotlb_free(void)
-{
-       if (!io_tlb_overflow_buffer)
-               return;
-
-       if (late_alloc) {
-               free_pages((unsigned long)io_tlb_overflow_buffer,
-                          get_order(io_tlb_overflow));
-               free_pages((unsigned long)io_tlb_orig_addr,
-                          get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
-               free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
-                                                                sizeof(int)));
-               free_pages((unsigned long)io_tlb_start,
-                          get_order(io_tlb_nslabs << IO_TLB_SHIFT));
-       } else {
-               free_bootmem_late(__pa(io_tlb_overflow_buffer),
-                                 io_tlb_overflow);
-               free_bootmem_late(__pa(io_tlb_orig_addr),
-                                 io_tlb_nslabs * sizeof(phys_addr_t));
-               free_bootmem_late(__pa(io_tlb_list),
-                                 io_tlb_nslabs * sizeof(int));
-               free_bootmem_late(__pa(io_tlb_start),
-                                 io_tlb_nslabs << IO_TLB_SHIFT);
-       }
-}
-
-int is_swiotlb_buffer(phys_addr_t paddr)
-{
-       return paddr >= virt_to_phys(io_tlb_start) &&
-               paddr < virt_to_phys(io_tlb_end);
-}
-
-/*
- * 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)
-{
-       unsigned long pfn = PFN_DOWN(phys);
-
-       if (PageHighMem(pfn_to_page(pfn))) {
-               /* The buffer does not have a mapping.  Map it in and copy */
-               unsigned int offset = phys & ~PAGE_MASK;
-               char *buffer;
-               unsigned int sz = 0;
-               unsigned long flags;
-
-               while (size) {
-                       sz = min_t(size_t, PAGE_SIZE - offset, size);
-
-                       local_irq_save(flags);
-                       buffer = kmap_atomic(pfn_to_page(pfn),
-                                            KM_BOUNCE_READ);
-                       if (dir == DMA_TO_DEVICE)
-                               memcpy(dma_addr, buffer + offset, sz);
-                       else
-                               memcpy(buffer + offset, dma_addr, sz);
-                       kunmap_atomic(buffer, KM_BOUNCE_READ);
-                       local_irq_restore(flags);
-
-                       size -= sz;
-                       pfn++;
-                       dma_addr += sz;
-                       offset = 0;
-               }
-       } else {
-               if (dir == DMA_TO_DEVICE)
-                       memcpy(dma_addr, phys_to_virt(phys), size);
-               else
-                       memcpy(phys_to_virt(phys), dma_addr, size);
-       }
-}
-
-/*
- * Allocates bounce buffer and returns its kernel virtual address.
- */
-void *
-do_map_single(struct device *hwdev, phys_addr_t phys,
-              unsigned long start_dma_addr, size_t size, int dir)
-{
-       unsigned long flags;
-       char *dma_addr;
-       unsigned int nslots, stride, index, wrap;
-       int i;
-       unsigned long mask;
-       unsigned long offset_slots;
-       unsigned long max_slots;
-
-       mask = dma_get_seg_boundary(hwdev);
-       start_dma_addr = start_dma_addr & mask;
-       offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
-
-       /*
-        * Carefully handle integer overflow which can occur when mask == ~0UL.
-        */
-       max_slots = mask + 1
-                   ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
-                   : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
-
-       /*
-        * 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;
-
-       BUG_ON(!nslots);
-
-       /*
-        * 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);
-       index = ALIGN(io_tlb_index, stride);
-       if (index >= io_tlb_nslabs)
-               index = 0;
-       wrap = index;
-
-       do {
-               while (iommu_is_span_boundary(index, nslots, offset_slots,
-                                             max_slots)) {
-                       index += stride;
-                       if (index >= io_tlb_nslabs)
-                               index = 0;
-                       if (index == wrap)
-                               goto not_found;
-               }
-
-               /*
-                * 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);
-
-not_found:
-       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.
-        */
-       for (i = 0; i < nslots; i++)
-               io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT);
-       if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
-               swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
-
-       return dma_addr;
-}
-
-/*
- * dma_addr is the kernel virtual address of the bounce buffer to unmap.
- */
-void
-do_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;
-       phys_addr_t phys = 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);
-
-       /*
-        * Return the buffer to the free list by setting the corresponding
-        * entries to indicate the number of contiguous 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);
-}
-
-void
-do_sync_single(struct device *hwdev, char *dma_addr, size_t size,
-           int dir, int target)
-{
-       int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
-       phys_addr_t phys = io_tlb_orig_addr[index];
-
-       phys += ((unsigned long)dma_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);
-               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);
-               else
-                       BUG_ON(dir != DMA_FROM_DEVICE);
-               break;
-       default:
-               BUG();
-       }
-}
-
-void *
-swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-                      dma_addr_t *dma_handle, gfp_t flags)
-{
-       dma_addr_t dev_addr;
-       void *ret;
-       int order = get_order(size);
-       u64 dma_mask = DMA_BIT_MASK(32);
-       unsigned long start_dma_addr;
-
-       if (hwdev && hwdev->coherent_dma_mask)
-               dma_mask = hwdev->coherent_dma_mask;
-
-       ret = (void *)__get_free_pages(flags, order);
-       if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) {
-               /*
-                * The allocated memory isn't reachable by the device.
-                */
-               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 do_map_single(), which
-                * will grab memory from the lowest available address range.
-                */
-               start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
-               ret = do_map_single(hwdev, 0, start_dma_addr, size,
-                                   DMA_FROM_DEVICE);
-               if (!ret)
-                       return NULL;
-       }
-
-       memset(ret, 0, size);
-       dev_addr = swiotlb_virt_to_bus(hwdev, ret);
-
-       /* Confirm address can be DMA'd by device */
-       if (dev_addr + size - 1 > dma_mask) {
-               dev_err(hwdev, "DMA: 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 do_unmap_single */
-               do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
-               return NULL;
-       }
-       *dma_handle = dev_addr;
-       return ret;
-}
-EXPORT_SYMBOL(swiotlb_alloc_coherent);
-
-void
-swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
-                     dma_addr_t dev_addr)
-{
-       phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
-       WARN_ON(irqs_disabled());
-       if (!is_swiotlb_buffer(paddr))
-               free_pages((unsigned long)vaddr, get_order(size));
-       else
-               /* DMA_TO_DEVICE to avoid memcpy in do_unmap_single */
-               do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
-}
-EXPORT_SYMBOL(swiotlb_free_coherent);
-
-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 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.
-        */
-       dev_err(dev, "DMA: Out of SW-IOMMU space for %zu bytes.", size);
-
-       if (size <= io_tlb_overflow || !do_panic)
-               return;
-
-       if (dir == DMA_BIDIRECTIONAL)
-               panic("DMA: Random memory could be DMA accessed\n");
-       if (dir == DMA_FROM_DEVICE)
-               panic("DMA: Random memory could be DMA written\n");
-       if (dir == DMA_TO_DEVICE)
-               panic("DMA: Random memory could be DMA read\n");
-}
-
-/*
- * Map a single buffer of the indicated size for DMA in streaming mode.  The
- * physical address to use is returned.
- *
- * Once the device is given the dma address, the device owns this memory until
- * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
- */
-dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
-                           unsigned long offset, size_t size,
-                           enum dma_data_direction dir,
-                           struct dma_attrs *attrs)
-{
-       unsigned long start_dma_addr;
-       phys_addr_t phys = page_to_phys(page) + offset;
-       dma_addr_t dev_addr = phys_to_dma(dev, phys);
-       void *map;
-
-       BUG_ON(dir == DMA_NONE);
-       /*
-        * If the address happens to be in the device's DMA window,
-        * we can safely return the device addr and not worry about bounce
-        * buffering it.
-        */
-       if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
-               return dev_addr;
-
-       /*
-        * Oh well, have to allocate and map a bounce buffer.
-        */
-       start_dma_addr = swiotlb_virt_to_bus(dev, io_tlb_start);
-       map = do_map_single(dev, phys, start_dma_addr, size, dir);
-       if (!map) {
-               swiotlb_full(dev, size, dir, 1);
-               map = io_tlb_overflow_buffer;
-       }
-
-       dev_addr = swiotlb_virt_to_bus(dev, map);
-
-       /*
-        * Ensure that the address returned is DMA'ble
-        */
-       if (!dma_capable(dev, dev_addr, size))
-               panic("DMA: swiotlb_map_single: bounce buffer is not DMA'ble");
-
-       return dev_addr;
-}
-EXPORT_SYMBOL_GPL(swiotlb_map_page);
-
-/*
- * Unmap a single streaming mode DMA translation.  The dma_addr and size must
- * match what was provided for in a previous swiotlb_map_page 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.
- */
-static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
-                        size_t size, int dir)
-{
-       phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
-       BUG_ON(dir == DMA_NONE);
-
-       if (is_swiotlb_buffer(paddr)) {
-               do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
-               return;
-       }
-
-       if (dir != DMA_FROM_DEVICE)
-               return;
-
-       /*
-        * phys_to_virt doesn't work with hihgmem page but we could
-        * call dma_mark_clean() with hihgmem page here. However, we
-        * are fine since dma_mark_clean() is null on POWERPC. We can
-        * make dma_mark_clean() take a physical address if necessary.
-        */
-       dma_mark_clean(phys_to_virt(paddr), size);
-}
-
-void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
-                       size_t size, enum dma_data_direction dir,
-                       struct dma_attrs *attrs)
-{
-       unmap_single(hwdev, dev_addr, size, dir);
-}
-EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
-
-/*
- * Make physical memory consistent for a single streaming mode DMA translation
- * after a transfer.
- *
- * If you perform a swiotlb_map_page() but wish to interrogate the buffer
- * using the cpu, yet do not wish to teardown the dma mapping, you must
- * call this function before doing so.  At the next point you give the dma
- * address back to the card, you must first perform a
- * swiotlb_dma_sync_for_device, and then the device again owns the buffer
- */
-static void
-swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
-                   size_t size, int dir, int target)
-{
-       phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
-       BUG_ON(dir == DMA_NONE);
-
-       if (is_swiotlb_buffer(paddr)) {
-               do_sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
-               return;
-       }
-
-       if (dir != DMA_FROM_DEVICE)
-               return;
-
-       dma_mark_clean(phys_to_virt(paddr), size);
-}
-
-void
-swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
-                           size_t size, enum dma_data_direction dir)
-{
-       swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
-
-void
-swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
-                              size_t size, enum dma_data_direction dir)
-{
-       swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
-}
-EXPORT_SYMBOL(swiotlb_sync_single_for_device);
-
-/*
- * Same as above, but for a sub-range of the mapping.
- */
-static void
-swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
-                         unsigned long offset, size_t size,
-                         int dir, int target)
-{
-       swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
-}
-
-void
-swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
-                                 unsigned long offset, size_t size,
-                                 enum dma_data_direction dir)
-{
-       swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
-                                 SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
-
-void
-swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
-                                    unsigned long offset, size_t size,
-                                    enum dma_data_direction dir)
-{
-       swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
-                                 SYNC_FOR_DEVICE);
-}
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
-
-/*
- * Map a set of buffers described by scatterlist in streaming mode for DMA.
- * This is the scatter-gather version of the above swiotlb_map_page
- * 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_page are the
- * same here.
- */
-int
-swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
-                    enum dma_data_direction dir, struct dma_attrs *attrs)
-{
-       unsigned long start_dma_addr;
-       struct scatterlist *sg;
-       int i;
-
-       BUG_ON(dir == DMA_NONE);
-
-       start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
-       for_each_sg(sgl, sg, nelems, i) {
-               phys_addr_t paddr = sg_phys(sg);
-               dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
-
-               if (swiotlb_force ||
-                   !dma_capable(hwdev, dev_addr, sg->length)) {
-                       void *map = do_map_single(hwdev, sg_phys(sg),
-                                                 start_dma_addr,
-                                                 sg->length, dir);
-                       if (!map) {
-                               /* Don't panic here, we expect map_sg users
-                                  to do proper error handling. */
-                               swiotlb_full(hwdev, sg->length, dir, 0);
-                               swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
-                                                      attrs);
-                               sgl[0].dma_length = 0;
-                               return 0;
-                       }
-                       sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
-               } else
-                       sg->dma_address = dev_addr;
-               sg->dma_length = sg->length;
-       }
-       return nelems;
-}
-EXPORT_SYMBOL(swiotlb_map_sg_attrs);
-
-int
-swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
-              int dir)
-{
-       return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL(swiotlb_map_sg);
-
-/*
- * Unmap a set of streaming mode DMA translations.  Again, cpu read rules
- * concerning calls here are the same as for swiotlb_unmap_page() above.
- */
-void
-swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
-                      int nelems, enum dma_data_direction dir,
-                      struct dma_attrs *attrs)
-{
-       struct scatterlist *sg;
-       int i;
-
-       BUG_ON(dir == DMA_NONE);
-
-       for_each_sg(sgl, sg, nelems, i)
-               unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
-
-}
-EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
-
-void
-swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
-                int dir)
-{
-       return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL(swiotlb_unmap_sg);
-
-/*
- * 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.
- */
-static void
-swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
-               int nelems, int dir, int target)
-{
-       struct scatterlist *sg;
-       int i;
-
-       for_each_sg(sgl, sg, nelems, i)
-               swiotlb_sync_single(hwdev, sg->dma_address,
-                                   sg->dma_length, dir, target);
-}
-
-void
-swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
-                       int nelems, enum dma_data_direction dir)
-{
-       swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
-
-void
-swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
-                          int nelems, enum dma_data_direction dir)
-{
-       swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
-}
-EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
-
-int
-swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
-{
-       return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer));
-}
-EXPORT_SYMBOL(swiotlb_dma_mapping_error);
-
-/*
- * Return whether the given device DMA address mask can be supported
- * properly.  For example, if your device can only drive the low 24-bits
- * during bus mastering, then you would pass 0x00ffffff as the mask to
- * this function.
- */
-int
-swiotlb_dma_supported(struct device *hwdev, u64 mask)
-{
-       return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
-}
-EXPORT_SYMBOL(swiotlb_dma_supported);
-- 
1.6.2.5


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