1 files changed, 32 insertions, 24 deletions

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index bc684d1fd426..067eed5b2758 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -1,7 +1,7 @@
 /*
  * Dynamic DMA mapping support.
  *
- * This implementation is for IA-64 and EM64T platforms that do not support
+ * This implementation is a fallback for platforms that do not support
  * I/O TLBs (aka DMA address translation hardware).
  * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com>
  * Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com>
@@ -129,23 +129,25 @@ __setup("swiotlb=", setup_io_tlb_npages);
  * Statically reserve bounce buffer space and initialize bounce buffer data
  * structures for the software IO TLB used to implement the DMA API.
  */
-void
-swiotlb_init_with_default_size (size_t default_size)
+void __init
+swiotlb_init_with_default_size(size_t default_size)
 {
-        unsigned long i;
+        unsigned long i, bytes;
 
         if (!io_tlb_nslabs) {
                 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
                 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
         }
 
+        bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+
         /*
          * Get IO TLB memory from the low pages
          */
-        io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs * (1 << IO_TLB_SHIFT));
+        io_tlb_start = alloc_bootmem_low_pages(bytes);
         if (!io_tlb_start)
                 panic("Cannot allocate SWIOTLB buffer");
-        io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT);
+        io_tlb_end = io_tlb_start + bytes;
 
         /*
          * Allocate and initialize the free list array.  This array is used
@@ -162,12 +164,15 @@ swiotlb_init_with_default_size (size_t default_size)
          * Get the overflow emergency buffer
          */
         io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
+        if (!io_tlb_overflow_buffer)
+                panic("Cannot allocate SWIOTLB overflow buffer!\n");
+
         printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n",
                virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
 }
 
-void
-swiotlb_init (void)
+void __init
+swiotlb_init(void)
 {
         swiotlb_init_with_default_size(64 * (1<<20));   /* default to 64MB */
 }
@@ -178,9 +183,9 @@ swiotlb_init (void)
  * This should be just like above, but with some error catching.
  */
 int
-swiotlb_late_init_with_default_size (size_t default_size)
+swiotlb_late_init_with_default_size(size_t default_size)
 {
-        unsigned long i, req_nslabs = io_tlb_nslabs;
+        unsigned long i, bytes, req_nslabs = io_tlb_nslabs;
         unsigned int order;
 
         if (!io_tlb_nslabs) {
@@ -191,8 +196,9 @@ swiotlb_late_init_with_default_size (size_t default_size)
         /*
          * Get IO TLB memory from the low pages
          */
-        order = get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT));
+        order = get_order(io_tlb_nslabs << IO_TLB_SHIFT);
         io_tlb_nslabs = SLABS_PER_PAGE << order;
+        bytes = io_tlb_nslabs << IO_TLB_SHIFT;
 
         while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
                 io_tlb_start = (char *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
@@ -205,13 +211,14 @@ swiotlb_late_init_with_default_size (size_t default_size)
         if (!io_tlb_start)
                 goto cleanup1;
 
-        if (order != get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT))) {
+        if (order != get_order(bytes)) {
                 printk(KERN_WARNING "Warning: only able to allocate %ld MB "
                        "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
                 io_tlb_nslabs = SLABS_PER_PAGE << order;
+                bytes = io_tlb_nslabs << IO_TLB_SHIFT;
         }
-        io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT);
-        memset(io_tlb_start, 0, io_tlb_nslabs * (1 << IO_TLB_SHIFT));
+        io_tlb_end = io_tlb_start + bytes;
+        memset(io_tlb_start, 0, bytes);
 
         /*
          * Allocate and initialize the free list array.  This array is used
@@ -242,8 +249,8 @@ swiotlb_late_init_with_default_size (size_t default_size)
         if (!io_tlb_overflow_buffer)
                 goto cleanup4;
 
-        printk(KERN_INFO "Placing %ldMB software IO TLB between 0x%lx - "
-               "0x%lx\n", (io_tlb_nslabs * (1 << IO_TLB_SHIFT)) >> 20,
+        printk(KERN_INFO "Placing %luMB software IO TLB between 0x%lx - "
+               "0x%lx\n", bytes >> 20,
                virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
 
         return 0;
@@ -256,8 +263,8 @@ cleanup3:
         free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
                                                          sizeof(int)));
         io_tlb_list = NULL;
-        io_tlb_end = NULL;
 cleanup2:
+        io_tlb_end = NULL;
         free_pages((unsigned long)io_tlb_start, order);
         io_tlb_start = NULL;
 cleanup1:
@@ -433,7 +440,7 @@ void *
 swiotlb_alloc_coherent(struct device *hwdev, size_t size,
                        dma_addr_t *dma_handle, gfp_t flags)
 {
-        unsigned long dev_addr;
+        dma_addr_t dev_addr;
         void *ret;
         int order = get_order(size);
 
@@ -473,8 +480,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 
         /* Confirm address can be DMA'd by device */
         if (address_needs_mapping(hwdev, dev_addr)) {
-                printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016lx\n",
-                       (unsigned long long)*hwdev->dma_mask, dev_addr);
+                printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
+                       (unsigned long long)*hwdev->dma_mask,
+                       (unsigned long long)dev_addr);
                 panic("swiotlb_alloc_coherent: allocated memory is out of "
                       "range for device");
         }
@@ -504,7 +512,7 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
          * When the mapping is small enough return a static buffer to limit
          * the damage, or panic when the transfer is too big.
          */
-        printk(KERN_ERR "DMA: Out of SW-IOMMU space for %lu bytes at "
+        printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at "
                "device %s\n", size, dev ? dev->bus_id : "?");
 
         if (size > io_tlb_overflow && do_panic) {
@@ -525,7 +533,7 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
 dma_addr_t
 swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir)
 {
-        unsigned long dev_addr = virt_to_bus(ptr);
+        dma_addr_t dev_addr = virt_to_bus(ptr);
         void *map;
 
         BUG_ON(dir == DMA_NONE);
@@ -669,7 +677,7 @@ swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
                int dir)
 {
         void *addr;
-        unsigned long dev_addr;
+        dma_addr_t dev_addr;
         int i;
 
         BUG_ON(dir == DMA_NONE);
@@ -765,7 +773,7 @@ swiotlb_dma_mapping_error(dma_addr_t dma_addr)
  * this function.
  */
 int
-swiotlb_dma_supported (struct device *hwdev, u64 mask)
+swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
         return virt_to_bus(io_tlb_end - 1) <= mask;
 }