/*
* 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)
+static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir)
{
- unsigned long pfn = PFN_DOWN(phys);
+ unsigned long pfn = PFN_DOWN(orig_addr);
+ unsigned char *vaddr = phys_to_virt(tlb_addr);
if (PageHighMem(pfn_to_page(pfn))) {
/* The buffer does not have a mapping. Map it in and copy */
- unsigned int offset = phys & ~PAGE_MASK;
+ unsigned int offset = orig_addr & ~PAGE_MASK;
char *buffer;
unsigned int sz = 0;
unsigned long flags;
local_irq_save(flags);
buffer = kmap_atomic(pfn_to_page(pfn));
if (dir == DMA_TO_DEVICE)
- memcpy(dma_addr, buffer + offset, sz);
+ memcpy(vaddr, buffer + offset, sz);
else
- memcpy(buffer + offset, dma_addr, sz);
+ memcpy(buffer + offset, vaddr, sz);
kunmap_atomic(buffer);
local_irq_restore(flags);
size -= sz;
pfn++;
- dma_addr += sz;
+ vaddr += sz;
offset = 0;
}
+ } else if (dir == DMA_TO_DEVICE) {
+ memcpy(vaddr, phys_to_virt(orig_addr), size);
} else {
- if (dir == DMA_TO_DEVICE)
- memcpy(dma_addr, phys_to_virt(phys), size);
- else
- memcpy(phys_to_virt(phys), dma_addr, size);
+ memcpy(phys_to_virt(orig_addr), vaddr, size);
}
}
-EXPORT_SYMBOL_GPL(swiotlb_bounce);
-void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
- phys_addr_t phys, size_t size,
- enum dma_data_direction dir)
+phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
+ dma_addr_t tbl_dma_addr,
+ phys_addr_t orig_addr, size_t size,
+ enum dma_data_direction dir)
{
unsigned long flags;
- char *dma_addr;
+ phys_addr_t tlb_addr;
unsigned int nslots, stride, index, wrap;
int i;
unsigned long mask;
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 = (char *)phys_to_virt(io_tlb_start) + (index << IO_TLB_SHIFT);
+ tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT);
/*
* Update the indices to avoid searching in the next
not_found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
- return NULL;
+ return SWIOTLB_MAP_ERROR;
found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
* needed.
*/
for (i = 0; i < nslots; i++)
- io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT);
+ io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
- swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
+ swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE);
- return dma_addr;
+ return tlb_addr;
}
EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single);
* Allocates bounce buffer and returns its kernel virtual address.
*/
-static void *
-map_single(struct device *hwdev, phys_addr_t phys, size_t size,
- enum dma_data_direction dir)
+phys_addr_t map_single(struct device *hwdev, phys_addr_t phys, size_t size,
+ enum dma_data_direction dir)
{
dma_addr_t start_dma_addr = phys_to_dma(hwdev, io_tlb_start);
/*
* dma_addr is the kernel virtual address of the bounce buffer to unmap.
*/
-void
-swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
- enum dma_data_direction dir)
+void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir)
{
unsigned long flags;
int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
- int index = (dma_addr - (char *)phys_to_virt(io_tlb_start)) >> IO_TLB_SHIFT;
- phys_addr_t phys = io_tlb_orig_addr[index];
+ int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
+ phys_addr_t orig_addr = 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);
+ if (orig_addr && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
+ swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
/*
* Return the buffer to the free list by setting the corresponding
}
EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single);
-void
-swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size,
- enum dma_data_direction dir,
- enum dma_sync_target target)
+void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir,
+ enum dma_sync_target target)
{
- int index = (dma_addr - (char *)phys_to_virt(io_tlb_start)) >> IO_TLB_SHIFT;
- phys_addr_t phys = io_tlb_orig_addr[index];
+ int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
+ phys_addr_t orig_addr = io_tlb_orig_addr[index];
- phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1));
+ orig_addr += (unsigned long)tlb_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);
+ swiotlb_bounce(orig_addr, tlb_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);
+ swiotlb_bounce(orig_addr, tlb_addr,
+ size, DMA_TO_DEVICE);
else
BUG_ON(dir != DMA_FROM_DEVICE);
break;
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) {
+ dev_addr = swiotlb_virt_to_bus(hwdev, ret);
+ if (dev_addr + size - 1 > dma_mask) {
+ /*
+ * The allocated memory isn't reachable by the device.
+ */
+ free_pages((unsigned long) ret, order);
+ ret = NULL;
+ }
}
if (!ret) {
/*
* GFP_DMA memory; fall back on map_single(), which
* will grab memory from the lowest available address range.
*/
- ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
- if (!ret)
+ phys_addr_t paddr = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
+ if (paddr == SWIOTLB_MAP_ERROR)
return NULL;
- }
- memset(ret, 0, size);
- dev_addr = swiotlb_virt_to_bus(hwdev, ret);
+ ret = phys_to_virt(paddr);
+ dev_addr = phys_to_dma(hwdev, paddr);
- /* Confirm address can be DMA'd by device */
- if (dev_addr + size - 1 > dma_mask) {
- printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
- (unsigned long long)dma_mask,
- (unsigned long long)dev_addr);
+ /* Confirm address can be DMA'd by device */
+ if (dev_addr + size - 1 > dma_mask) {
+ printk("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 unmap_single */
- swiotlb_tbl_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
- return NULL;
+ /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
+ swiotlb_tbl_unmap_single(hwdev, paddr,
+ size, DMA_TO_DEVICE);
+ return NULL;
+ }
}
+
*dma_handle = dev_addr;
+ memset(ret, 0, size);
+
return ret;
}
EXPORT_SYMBOL(swiotlb_alloc_coherent);
free_pages((unsigned long)vaddr, get_order(size));
else
/* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */
- swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
+ swiotlb_tbl_unmap_single(hwdev, paddr, size, DMA_TO_DEVICE);
}
EXPORT_SYMBOL(swiotlb_free_coherent);
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
- phys_addr_t phys = page_to_phys(page) + offset;
+ phys_addr_t map, phys = page_to_phys(page) + offset;
dma_addr_t dev_addr = phys_to_dma(dev, phys);
- void *map;
BUG_ON(dir == DMA_NONE);
/*
if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
return dev_addr;
- /*
- * Oh well, have to allocate and map a bounce buffer.
- */
+ /* Oh well, have to allocate and map a bounce buffer. */
map = map_single(dev, phys, size, dir);
- if (!map) {
+ if (map == SWIOTLB_MAP_ERROR) {
swiotlb_full(dev, size, dir, 1);
return phys_to_dma(dev, io_tlb_overflow_buffer);
}
- dev_addr = swiotlb_virt_to_bus(dev, map);
+ dev_addr = phys_to_dma(dev, map);
- /*
- * Ensure that the address returned is DMA'ble
- */
+ /* Ensure that the address returned is DMA'ble */
if (!dma_capable(dev, dev_addr, size)) {
swiotlb_tbl_unmap_single(dev, map, size, dir);
return phys_to_dma(dev, io_tlb_overflow_buffer);
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(paddr)) {
- swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
+ swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
return;
}
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(paddr)) {
- swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir,
- target);
+ swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
return;
}
if (swiotlb_force ||
!dma_capable(hwdev, dev_addr, sg->length)) {
- void *map = map_single(hwdev, sg_phys(sg),
- sg->length, dir);
- if (!map) {
+ phys_addr_t map = map_single(hwdev, sg_phys(sg),
+ sg->length, dir);
+ if (map == SWIOTLB_MAP_ERROR) {
/* Don't panic here, we expect map_sg users
to do proper error handling. */
swiotlb_full(hwdev, sg->length, dir, 0);
sgl[0].dma_length = 0;
return 0;
}
- sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
+ sg->dma_address = phys_to_dma(hwdev, map);
} else
sg->dma_address = dev_addr;
sg->dma_length = sg->length;
projects / ~andy / linux / blobdiff