Merge branch 'core/iommu' into core/urgent

Conflicts:
	lib/swiotlb.c

5 files changed, 105 insertions, 214 deletions

diff --git a/arch/ia64/include/asm/swiotlb.h b/arch/ia64/include/asm/swiotlb.h
index fb79423834d0..dcbaea7ce128 100644
--- a/arch/ia64/include/asm/swiotlb.h
+++ b/arch/ia64/include/asm/swiotlb.h
@@ -2,44 +2,7 @@
 #define ASM_IA64__SWIOTLB_H
 
 #include <linux/dma-mapping.h>
-
-/* SWIOTLB interface */
-
-extern dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr,
-                                     size_t size, int dir);
-extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-                                    dma_addr_t *dma_handle, gfp_t flags);
-extern void swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
-                                 size_t size, int dir);
-extern void swiotlb_sync_single_for_cpu(struct device *hwdev,
-                                        dma_addr_t dev_addr,
-                                        size_t size, int dir);
-extern void swiotlb_sync_single_for_device(struct device *hwdev,
-                                           dma_addr_t dev_addr,
-                                           size_t size, int dir);
-extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
-                                              dma_addr_t dev_addr,
-                                              unsigned long offset,
-                                              size_t size, int dir);
-extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
-                                                 dma_addr_t dev_addr,
-                                                 unsigned long offset,
-                                                 size_t size, int dir);
-extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
-                                    struct scatterlist *sg, int nelems,
-                                    int dir);
-extern void swiotlb_sync_sg_for_device(struct device *hwdev,
-                                       struct scatterlist *sg, int nelems,
-                                       int dir);
-extern int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg,
-                          int nents, int direction);
-extern void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg,
-                             int nents, int direction);
-extern int swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
-extern void swiotlb_free_coherent(struct device *hwdev, size_t size,
-                                  void *vaddr, dma_addr_t dma_handle);
-extern int swiotlb_dma_supported(struct device *hwdev, u64 mask);
-extern void swiotlb_init(void);
+#include <linux/swiotlb.h>
 
 extern int swiotlb_force;
 
diff --git a/arch/x86/include/asm/swiotlb.h b/arch/x86/include/asm/swiotlb.h
index 51fb2c76ad74..b9e4e20174fb 100644
--- a/arch/x86/include/asm/swiotlb.h
+++ b/arch/x86/include/asm/swiotlb.h
@@ -1,46 +1,10 @@
 #ifndef _ASM_X86_SWIOTLB_H
 #define _ASM_X86_SWIOTLB_H
 
-#include <asm/dma-mapping.h>
+#include <linux/swiotlb.h>
 
 /* SWIOTLB interface */
 
-extern dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr,
-                                     size_t size, int dir);
-extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-                                    dma_addr_t *dma_handle, gfp_t flags);
-extern void swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
-                                 size_t size, int dir);
-extern void swiotlb_sync_single_for_cpu(struct device *hwdev,
-                                        dma_addr_t dev_addr,
-                                        size_t size, int dir);
-extern void swiotlb_sync_single_for_device(struct device *hwdev,
-                                           dma_addr_t dev_addr,
-                                           size_t size, int dir);
-extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
-                                              dma_addr_t dev_addr,
-                                              unsigned long offset,
-                                              size_t size, int dir);
-extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
-                                                 dma_addr_t dev_addr,
-                                                 unsigned long offset,
-                                                 size_t size, int dir);
-extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
-                                    struct scatterlist *sg, int nelems,
-                                    int dir);
-extern void swiotlb_sync_sg_for_device(struct device *hwdev,
-                                       struct scatterlist *sg, int nelems,
-                                       int dir);
-extern int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg,
-                          int nents, int direction);
-extern void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg,
-                             int nents, int direction);
-extern int swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
-extern void swiotlb_free_coherent(struct device *hwdev, size_t size,
-                                  void *vaddr, dma_addr_t dma_handle);
-extern int swiotlb_dma_supported(struct device *hwdev, u64 mask);
-extern void swiotlb_init(void);
-
 extern int swiotlb_force;
 
 #ifdef CONFIG_SWIOTLB
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
index 8cba3749a511..d59c91747665 100644
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -23,7 +23,7 @@ void *swiotlb_alloc(unsigned order, unsigned long nslabs)
         return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
 }
 
-dma_addr_t swiotlb_phys_to_bus(phys_addr_t paddr)
+dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
 {
         return paddr;
 }
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 325af1de0351..dedd3c0cfe30 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -27,7 +27,8 @@ swiotlb_init(void);
 extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
 extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
 
-extern dma_addr_t swiotlb_phys_to_bus(phys_addr_t address);
+extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev,
+                                      phys_addr_t address);
 extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);
 
 extern int swiotlb_arch_range_needs_mapping(void *ptr, size_t size);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 7f5e21b9c16b..48deef7e1976 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -14,6 +14,7 @@
  * 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>
@@ -21,8 +22,9 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
-#include <linux/swiotlb.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>
@@ -88,10 +90,7 @@ static unsigned int io_tlb_index;
  * We need to save away the original address corresponding to a mapped entry
  * for the sync operations.
  */
-static struct swiotlb_phys_addr {
-        struct page *page;
-        unsigned int offset;
-} *io_tlb_orig_addr;
+static phys_addr_t *io_tlb_orig_addr;
 
 /*
  * Protect the above data structures in the map and unmap calls
@@ -125,7 +124,7 @@ void * __weak swiotlb_alloc(unsigned order, unsigned long nslabs)
         return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
 }
 
-dma_addr_t __weak swiotlb_phys_to_bus(phys_addr_t paddr)
+dma_addr_t __weak swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
 {
         return paddr;
 }
@@ -135,9 +134,10 @@ phys_addr_t __weak swiotlb_bus_to_phys(dma_addr_t baddr)
         return baddr;
 }
 
-static dma_addr_t swiotlb_virt_to_bus(volatile void *address)
+static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
+                                      volatile void *address)
 {
-        return swiotlb_phys_to_bus(virt_to_phys(address));
+        return swiotlb_phys_to_bus(hwdev, virt_to_phys(address));
 }
 
 static void *swiotlb_bus_to_virt(dma_addr_t address)
@@ -150,35 +150,18 @@ int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)
         return 0;
 }
 
-static dma_addr_t swiotlb_sg_to_bus(struct scatterlist *sg)
-{
-        return swiotlb_phys_to_bus(page_to_phys(sg_page(sg)) + sg->offset);
-}
-
 static void swiotlb_print_info(unsigned long bytes)
 {
         phys_addr_t pstart, pend;
-        dma_addr_t bstart, bend;
 
         pstart = virt_to_phys(io_tlb_start);
         pend = virt_to_phys(io_tlb_end);
 
-        bstart = swiotlb_phys_to_bus(pstart);
-        bend = swiotlb_phys_to_bus(pend);
-
         printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p\n",
                bytes >> 20, io_tlb_start, io_tlb_end);
-        if (pstart != bstart || pend != bend)
-                printk(KERN_INFO "software IO TLB at phys %#llx - %#llx"
-                       " bus %#llx - %#llx\n",
-                       (unsigned long long)pstart,
-                       (unsigned long long)pend,
-                       (unsigned long long)bstart,
-                       (unsigned long long)bend);
-        else
-                printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n",
-                       (unsigned long long)pstart,
-                       (unsigned long long)pend);
+        printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n",
+               (unsigned long long)pstart,
+               (unsigned long long)pend);
 }
 
 /*
@@ -214,7 +197,7 @@ swiotlb_init_with_default_size(size_t default_size)
         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(struct swiotlb_phys_addr));
+        io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
 
         /*
          * Get the overflow emergency buffer
@@ -288,12 +271,14 @@ swiotlb_late_init_with_default_size(size_t default_size)
                 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
         io_tlb_index = 0;
 
-        io_tlb_orig_addr = (struct swiotlb_phys_addr *)__get_free_pages(GFP_KERNEL,
-                                   get_order(io_tlb_nslabs * sizeof(struct swiotlb_phys_addr)));
+        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(struct swiotlb_phys_addr));
+        memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
 
         /*
          * Get the overflow emergency buffer
@@ -308,8 +293,8 @@ swiotlb_late_init_with_default_size(size_t default_size)
         return 0;
 
 cleanup4:
-        free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
-                                                              sizeof(char *)));
+        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 *
@@ -340,51 +325,44 @@ static int is_swiotlb_buffer(char *addr)
         return addr >= io_tlb_start && addr < io_tlb_end;
 }
 
-static struct swiotlb_phys_addr swiotlb_bus_to_phys_addr(char *dma_addr)
-{
-        int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
-        struct swiotlb_phys_addr buffer = io_tlb_orig_addr[index];
-        buffer.offset += (long)dma_addr & ((1 << IO_TLB_SHIFT) - 1);
-        buffer.page += buffer.offset >> PAGE_SHIFT;
-        buffer.offset &= PAGE_SIZE - 1;
-        return buffer;
-}
-
-static void
-__sync_single(struct swiotlb_phys_addr buffer, char *dma_addr, size_t size, int dir)
-{
-        if (PageHighMem(buffer.page)) {
-                size_t len, bytes;
-                char *dev, *host, *kmp;
-
-                len = size;
-                while (len != 0) {
-                        unsigned long flags;
-
-                        bytes = len;
-                        if ((bytes + buffer.offset) > PAGE_SIZE)
-                                bytes = PAGE_SIZE - buffer.offset;
-                        local_irq_save(flags); /* protects KM_BOUNCE_READ */
-                        kmp  = kmap_atomic(buffer.page, KM_BOUNCE_READ);
-                        dev  = dma_addr + size - len;
-                        host = kmp + buffer.offset;
-                        if (dir == DMA_FROM_DEVICE)
-                                memcpy(host, dev, bytes);
+/*
+ * Bounce: copy the swiotlb buffer back to the original dma location
+ */
+static 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(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(dev, host, bytes);
-                        kunmap_atomic(kmp, KM_BOUNCE_READ);
+                                memcpy(buffer + offset, dma_addr, sz);
+                        kunmap_atomic(buffer, KM_BOUNCE_READ);
                         local_irq_restore(flags);
-                        len -= bytes;
-                        buffer.page++;
-                        buffer.offset = 0;
+
+                        size -= sz;
+                        pfn++;
+                        dma_addr += sz;
+                        offset = 0;
                 }
         } else {
-                void *v = page_address(buffer.page) + buffer.offset;
-
                 if (dir == DMA_TO_DEVICE)
-                        memcpy(dma_addr, v, size);
+                        memcpy(dma_addr, phys_to_virt(phys), size);
                 else
-                        memcpy(v, dma_addr, size);
+                        memcpy(phys_to_virt(phys), dma_addr, size);
         }
 }
 
@@ -392,7 +370,7 @@ __sync_single(struct swiotlb_phys_addr buffer, char *dma_addr, size_t size, int
  * Allocates bounce buffer and returns its kernel virtual address.
  */
 static void *
-map_single(struct device *hwdev, struct swiotlb_phys_addr buffer, size_t size, int dir)
+map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir)
 {
         unsigned long flags;
         char *dma_addr;
@@ -402,10 +380,9 @@ map_single(struct device *hwdev, struct swiotlb_phys_addr buffer, size_t size, i
         unsigned long mask;
         unsigned long offset_slots;
         unsigned long max_slots;
-        struct swiotlb_phys_addr slot_buf;
 
         mask = dma_get_seg_boundary(hwdev);
-        start_dma_addr = swiotlb_virt_to_bus(io_tlb_start) & mask;
+        start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask;
 
         offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
 
@@ -487,15 +464,10 @@ found:
          * This is needed when we sync the memory.  Then we sync the buffer if
          * needed.
          */
-        slot_buf = buffer;
-        for (i = 0; i < nslots; i++) {
-                slot_buf.page += slot_buf.offset >> PAGE_SHIFT;
-                slot_buf.offset &= PAGE_SIZE - 1;
-                io_tlb_orig_addr[index+i] = slot_buf;
-                slot_buf.offset += 1 << IO_TLB_SHIFT;
-        }
+        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)
-                __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
+                swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
 
         return dma_addr;
 }
@@ -509,17 +481,13 @@ 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;
-        struct swiotlb_phys_addr buffer = swiotlb_bus_to_phys_addr(dma_addr);
+        phys_addr_t phys = io_tlb_orig_addr[index];
 
         /*
          * First, sync the memory before unmapping the entry
          */
-        if ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))
-                /*
-                 * bounce... copy the data back into the original buffer * and
-                 * delete the bounce buffer.
-                 */
-                __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
+        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
@@ -551,18 +519,21 @@ static void
 sync_single(struct device *hwdev, char *dma_addr, size_t size,
             int dir, int target)
 {
-        struct swiotlb_phys_addr buffer = swiotlb_bus_to_phys_addr(dma_addr);
+        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))
-                        __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
+                        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))
-                        __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
+                        swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
                 else
                         BUG_ON(dir != DMA_FROM_DEVICE);
                 break;
@@ -584,7 +555,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
                 dma_mask = hwdev->coherent_dma_mask;
 
         ret = (void *)__get_free_pages(flags, order);
-        if (ret && !is_buffer_dma_capable(dma_mask, swiotlb_virt_to_bus(ret), size)) {
+        if (ret &&
+            !is_buffer_dma_capable(dma_mask, swiotlb_virt_to_bus(hwdev, ret),
+                                   size)) {
                 /*
                  * The allocated memory isn't reachable by the device.
                  * Fall back on swiotlb_map_single().
@@ -599,16 +572,13 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
                  * swiotlb_map_single(), which will grab memory from
                  * the lowest available address range.
                  */
-                struct swiotlb_phys_addr buffer;
-                buffer.page = virt_to_page(NULL);
-                buffer.offset = 0;
-                ret = map_single(hwdev, buffer, size, DMA_FROM_DEVICE);
+                ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
                 if (!ret)
                         return NULL;
         }
 
         memset(ret, 0, size);
-        dev_addr = swiotlb_virt_to_bus(ret);
+        dev_addr = swiotlb_virt_to_bus(hwdev, ret);
 
         /* Confirm address can be DMA'd by device */
         if (!is_buffer_dma_capable(dma_mask, dev_addr, size)) {
@@ -623,6 +593,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
         *dma_handle = dev_addr;
         return ret;
 }
+EXPORT_SYMBOL(swiotlb_alloc_coherent);
 
 void
 swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
@@ -635,6 +606,7 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
                 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
                 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)
@@ -668,9 +640,8 @@ dma_addr_t
 swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
                          int dir, struct dma_attrs *attrs)
 {
-        dma_addr_t dev_addr = swiotlb_virt_to_bus(ptr);
+        dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, ptr);
         void *map;
-        struct swiotlb_phys_addr buffer;
 
         BUG_ON(dir == DMA_NONE);
         /*
@@ -685,15 +656,13 @@ swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
         /*
          * Oh well, have to allocate and map a bounce buffer.
          */
-        buffer.page   = virt_to_page(ptr);
-        buffer.offset = (unsigned long)ptr & ~PAGE_MASK;
-        map = map_single(hwdev, buffer, size, dir);
+        map = map_single(hwdev, virt_to_phys(ptr), size, dir);
         if (!map) {
                 swiotlb_full(hwdev, size, dir, 1);
                 map = io_tlb_overflow_buffer;
         }
 
-        dev_addr = swiotlb_virt_to_bus(map);
+        dev_addr = swiotlb_virt_to_bus(hwdev, map);
 
         /*
          * Ensure that the address returned is DMA'ble
@@ -710,6 +679,7 @@ swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir)
 {
         return swiotlb_map_single_attrs(hwdev, ptr, size, dir, NULL);
 }
+EXPORT_SYMBOL(swiotlb_map_single);
 
 /*
  * Unmap a single streaming mode DMA translation.  The dma_addr and size must
@@ -739,6 +709,8 @@ swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size,
 {
         return swiotlb_unmap_single_attrs(hwdev, dev_addr, size, dir, NULL);
 }
+EXPORT_SYMBOL(swiotlb_unmap_single);
+
 /*
  * Make physical memory consistent for a single streaming mode DMA translation
  * after a transfer.
@@ -768,6 +740,7 @@ swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
 {
         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,
@@ -775,6 +748,7 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
 {
         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.
@@ -800,6 +774,7 @@ swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
         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,
@@ -808,9 +783,8 @@ swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
         swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
                                   SYNC_FOR_DEVICE);
 }
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
 
-void swiotlb_unmap_sg_attrs(struct device *, struct scatterlist *, int, int,
-                            struct dma_attrs *);
 /*
  * 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
@@ -832,20 +806,18 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
                      int dir, struct dma_attrs *attrs)
 {
         struct scatterlist *sg;
-        struct swiotlb_phys_addr buffer;
-        dma_addr_t dev_addr;
         int i;
 
         BUG_ON(dir == DMA_NONE);
 
         for_each_sg(sgl, sg, nelems, i) {
-                dev_addr = swiotlb_sg_to_bus(sg);
-                if (range_needs_mapping(sg_virt(sg), sg->length) ||
+                void *addr = sg_virt(sg);
+                dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, addr);
+
+                if (range_needs_mapping(addr, sg->length) ||
                     address_needs_mapping(hwdev, dev_addr, sg->length)) {
-                        void *map;
-                        buffer.page   = sg_page(sg);
-                        buffer.offset = sg->offset;
-                        map = map_single(hwdev, buffer, sg->length, dir);
+                        void *map = map_single(hwdev, sg_phys(sg),
+                                               sg->length, dir);
                         if (!map) {
                                 /* Don't panic here, we expect map_sg users
                                    to do proper error handling. */
@@ -855,7 +827,7 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
                                 sgl[0].dma_length = 0;
                                 return 0;
                         }
-                        sg->dma_address = swiotlb_virt_to_bus(map);
+                        sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
                 } else
                         sg->dma_address = dev_addr;
                 sg->dma_length = sg->length;
@@ -870,6 +842,7 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
 {
         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
@@ -885,11 +858,11 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
         BUG_ON(dir == DMA_NONE);
 
         for_each_sg(sgl, sg, nelems, i) {
-                if (sg->dma_address != swiotlb_sg_to_bus(sg))
+                if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg)))
                         unmap_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
                                      sg->dma_length, dir);
                 else if (dir == DMA_FROM_DEVICE)
-                        dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
+                        dma_mark_clean(sg_virt(sg), sg->dma_length);
         }
 }
 EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
@@ -900,6 +873,7 @@ swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
 {
         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
@@ -918,11 +892,11 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
         BUG_ON(dir == DMA_NONE);
 
         for_each_sg(sgl, sg, nelems, i) {
-                if (sg->dma_address != swiotlb_sg_to_bus(sg))
+                if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg)))
                         sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
                                     sg->dma_length, dir, target);
                 else if (dir == DMA_FROM_DEVICE)
-                        dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
+                        dma_mark_clean(sg_virt(sg), sg->dma_length);
         }
 }
 
@@ -932,6 +906,7 @@ swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 {
         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,
@@ -939,12 +914,14 @@ swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 {
         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(io_tlb_overflow_buffer));
+        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
@@ -955,20 +932,6 @@ swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
 int
 swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
-        return swiotlb_virt_to_bus(io_tlb_end - 1) <= mask;
+        return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
 }
-
-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_GPL(swiotlb_sync_single_range_for_cpu);
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_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);