- Use dma addresses instead of the virt_to_phys and vice versa functions.
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Merge tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Pull swiotlb update from Konrad Rzeszutek Wilk:
 "Feature:
   - Use dma addresses instead of the virt_to_phys and vice versa
     functions.

  Remove the multitude of phys_to_virt/virt_to_phys calls and instead
  operate on the physical addresses instead of virtual in many of the
  internal functions.  This does provide a speed up in interrupt
  handlers that do DMA operations and use SWIOTLB."

* tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: Do not export swiotlb_bounce since there are no external consumers
  swiotlb: Use physical addresses instead of virtual in swiotlb_tbl_sync_single
  swiotlb: Use physical addresses for swiotlb_tbl_unmap_single
  swiotlb: Return physical addresses when calling swiotlb_tbl_map_single
  swiotlb: Make io_tlb_overflow_buffer a physical address
  swiotlb: Make io_tlb_start a physical address instead of a virtual one
  swiotlb: Make io_tlb_end a physical address instead of a virtual one
This commit is contained in:
Linus Torvalds 2012-12-16 17:39:14 -08:00
commit 9b690c3d56
3 changed files with 165 additions and 153 deletions

View File

@ -338,9 +338,8 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
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 = xen_phys_to_bus(phys);
void *map;
BUG_ON(dir == DMA_NONE);
/*
@ -356,10 +355,10 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
* Oh well, have to allocate and map a bounce buffer.
*/
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir);
if (!map)
if (map == SWIOTLB_MAP_ERROR)
return DMA_ERROR_CODE;
dev_addr = xen_virt_to_bus(map);
dev_addr = xen_phys_to_bus(map);
/*
* Ensure that the address returned is DMA'ble
@ -389,7 +388,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
return;
}
@ -434,8 +433,7 @@ xen_swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir,
target);
swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
return;
}
@ -494,11 +492,12 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
if (swiotlb_force ||
!dma_capable(hwdev, dev_addr, sg->length) ||
range_straddles_page_boundary(paddr, sg->length)) {
void *map = swiotlb_tbl_map_single(hwdev,
start_dma_addr,
sg_phys(sg),
sg->length, dir);
if (!map) {
phys_addr_t map = swiotlb_tbl_map_single(hwdev,
start_dma_addr,
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. */
xen_swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
@ -506,7 +505,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
sgl[0].dma_length = 0;
return DMA_ERROR_CODE;
}
sg->dma_address = xen_virt_to_bus(map);
sg->dma_address = xen_phys_to_bus(map);
} else
sg->dma_address = dev_addr;
sg->dma_length = sg->length;

View File

@ -34,21 +34,25 @@ enum dma_sync_target {
SYNC_FOR_CPU = 0,
SYNC_FOR_DEVICE = 1,
};
extern 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);
extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
/* define the last possible byte of physical address space as a mapping error */
#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
extern phys_addr_t 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);
extern void swiotlb_tbl_unmap_single(struct device *hwdev,
phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir);
extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
extern 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);
/* Accessory functions. */
extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
enum dma_data_direction dir);
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags);

View File

@ -57,7 +57,7 @@ int swiotlb_force;
* swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
* API.
*/
static char *io_tlb_start, *io_tlb_end;
static phys_addr_t io_tlb_start, io_tlb_end;
/*
* The number of IO TLB blocks (in groups of 64) between io_tlb_start and
@ -70,7 +70,7 @@ static unsigned long io_tlb_nslabs;
*/
static unsigned long io_tlb_overflow = 32*1024;
static void *io_tlb_overflow_buffer;
static phys_addr_t io_tlb_overflow_buffer;
/*
* This is a free list describing the number of free entries available from
@ -125,26 +125,37 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
void swiotlb_print_info(void)
{
unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
phys_addr_t pstart, pend;
unsigned char *vstart, *vend;
pstart = virt_to_phys(io_tlb_start);
pend = virt_to_phys(io_tlb_end);
vstart = phys_to_virt(io_tlb_start);
vend = phys_to_virt(io_tlb_end);
printk(KERN_INFO "software IO TLB [mem %#010llx-%#010llx] (%luMB) mapped at [%p-%p]\n",
(unsigned long long)pstart, (unsigned long long)pend - 1,
bytes >> 20, io_tlb_start, io_tlb_end - 1);
(unsigned long long)io_tlb_start,
(unsigned long long)io_tlb_end,
bytes >> 20, vstart, vend - 1);
}
void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
{
void *v_overflow_buffer;
unsigned long i, bytes;
bytes = nslabs << IO_TLB_SHIFT;
io_tlb_nslabs = nslabs;
io_tlb_start = tlb;
io_tlb_start = __pa(tlb);
io_tlb_end = io_tlb_start + bytes;
/*
* Get the overflow emergency buffer
*/
v_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow));
if (!v_overflow_buffer)
panic("Cannot allocate SWIOTLB overflow buffer!\n");
io_tlb_overflow_buffer = __pa(v_overflow_buffer);
/*
* Allocate and initialize the free list array. This array is used
* to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
@ -156,12 +167,6 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
io_tlb_index = 0;
io_tlb_orig_addr = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
/*
* Get the overflow emergency buffer
*/
io_tlb_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow));
if (!io_tlb_overflow_buffer)
panic("Cannot allocate SWIOTLB overflow buffer!\n");
if (verbose)
swiotlb_print_info();
}
@ -173,6 +178,7 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
static void __init
swiotlb_init_with_default_size(size_t default_size, int verbose)
{
unsigned char *vstart;
unsigned long bytes;
if (!io_tlb_nslabs) {
@ -185,11 +191,11 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
/*
* Get IO TLB memory from the low pages
*/
io_tlb_start = alloc_bootmem_low_pages(PAGE_ALIGN(bytes));
if (!io_tlb_start)
vstart = alloc_bootmem_low_pages(PAGE_ALIGN(bytes));
if (!vstart)
panic("Cannot allocate SWIOTLB buffer");
swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose);
swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose);
}
void __init
@ -207,6 +213,7 @@ int
swiotlb_late_init_with_default_size(size_t default_size)
{
unsigned long bytes, req_nslabs = io_tlb_nslabs;
unsigned char *vstart = NULL;
unsigned int order;
int rc = 0;
@ -223,14 +230,14 @@ swiotlb_late_init_with_default_size(size_t default_size)
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)
vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
order);
if (vstart)
break;
order--;
}
if (!io_tlb_start) {
if (!vstart) {
io_tlb_nslabs = req_nslabs;
return -ENOMEM;
}
@ -239,9 +246,9 @@ swiotlb_late_init_with_default_size(size_t default_size)
"for software IO TLB\n", (PAGE_SIZE << order) >> 20);
io_tlb_nslabs = SLABS_PER_PAGE << order;
}
rc = swiotlb_late_init_with_tbl(io_tlb_start, io_tlb_nslabs);
rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs);
if (rc)
free_pages((unsigned long)io_tlb_start, order);
free_pages((unsigned long)vstart, order);
return rc;
}
@ -249,14 +256,25 @@ int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
unsigned long i, bytes;
unsigned char *v_overflow_buffer;
bytes = nslabs << IO_TLB_SHIFT;
io_tlb_nslabs = nslabs;
io_tlb_start = tlb;
io_tlb_start = virt_to_phys(tlb);
io_tlb_end = io_tlb_start + bytes;
memset(io_tlb_start, 0, bytes);
memset(tlb, 0, bytes);
/*
* Get the overflow emergency buffer
*/
v_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
get_order(io_tlb_overflow));
if (!v_overflow_buffer)
goto cleanup2;
io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);
/*
* Allocate and initialize the free list array. This array is used
@ -266,7 +284,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
get_order(io_tlb_nslabs * sizeof(int)));
if (!io_tlb_list)
goto cleanup2;
goto cleanup3;
for (i = 0; i < io_tlb_nslabs; i++)
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
@ -277,18 +295,10 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
get_order(io_tlb_nslabs *
sizeof(phys_addr_t)));
if (!io_tlb_orig_addr)
goto cleanup3;
goto cleanup4;
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;
@ -296,42 +306,42 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
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;
cleanup3:
free_pages((unsigned long)v_overflow_buffer,
get_order(io_tlb_overflow));
io_tlb_overflow_buffer = 0;
cleanup2:
io_tlb_end = NULL;
io_tlb_start = NULL;
io_tlb_end = 0;
io_tlb_start = 0;
io_tlb_nslabs = 0;
return -ENOMEM;
}
void __init swiotlb_free(void)
{
if (!io_tlb_overflow_buffer)
if (!io_tlb_orig_addr)
return;
if (late_alloc) {
free_pages((unsigned long)io_tlb_overflow_buffer,
free_pages((unsigned long)phys_to_virt(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,
free_pages((unsigned long)phys_to_virt(io_tlb_start),
get_order(io_tlb_nslabs << IO_TLB_SHIFT));
} else {
free_bootmem_late(__pa(io_tlb_overflow_buffer),
free_bootmem_late(io_tlb_overflow_buffer,
PAGE_ALIGN(io_tlb_overflow));
free_bootmem_late(__pa(io_tlb_orig_addr),
PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
free_bootmem_late(__pa(io_tlb_list),
PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
free_bootmem_late(__pa(io_tlb_start),
free_bootmem_late(io_tlb_start,
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
}
io_tlb_nslabs = 0;
@ -339,21 +349,21 @@ void __init swiotlb_free(void)
static int is_swiotlb_buffer(phys_addr_t paddr)
{
return paddr >= virt_to_phys(io_tlb_start) &&
paddr < virt_to_phys(io_tlb_end);
return paddr >= io_tlb_start && paddr < 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)
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;
@ -364,32 +374,31 @@ void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
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;
@ -453,7 +462,7 @@ void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
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);
tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT);
/*
* Update the indices to avoid searching in the next
@ -471,7 +480,7 @@ void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
not_found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
return NULL;
return SWIOTLB_MAP_ERROR;
found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
@ -481,11 +490,11 @@ found:
* 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);
@ -493,11 +502,10 @@ 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 = swiotlb_virt_to_bus(hwdev, io_tlb_start);
dma_addr_t start_dma_addr = phys_to_dma(hwdev, io_tlb_start);
return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, dir);
}
@ -505,20 +513,19 @@ map_single(struct device *hwdev, phys_addr_t phys, size_t size,
/*
* 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 - 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
@ -547,26 +554,27 @@ swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
}
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 - 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;
@ -589,12 +597,15 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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) {
/*
@ -602,25 +613,29 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
* 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;
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);
/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
swiotlb_tbl_unmap_single(hwdev, paddr,
size, DMA_TO_DEVICE);
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) {
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_handle = dev_addr;
memset(ret, 0, size);
return ret;
}
EXPORT_SYMBOL(swiotlb_alloc_coherent);
@ -636,7 +651,7 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
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);
@ -677,9 +692,8 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
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);
/*
@ -690,23 +704,19 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
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);
map = io_tlb_overflow_buffer;
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);
dev_addr = swiotlb_virt_to_bus(dev, io_tlb_overflow_buffer);
return phys_to_dma(dev, io_tlb_overflow_buffer);
}
return dev_addr;
@ -729,7 +739,7 @@ static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
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;
}
@ -773,8 +783,7 @@ swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
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;
}
@ -831,9 +840,9 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
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);
@ -842,7 +851,7 @@ 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(hwdev, map);
sg->dma_address = phys_to_dma(hwdev, map);
} else
sg->dma_address = dev_addr;
sg->dma_length = sg->length;
@ -925,7 +934,7 @@ 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));
return (dma_addr == phys_to_dma(hwdev, io_tlb_overflow_buffer));
}
EXPORT_SYMBOL(swiotlb_dma_mapping_error);
@ -938,6 +947,6 @@ EXPORT_SYMBOL(swiotlb_dma_mapping_error);
int
swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
return phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
}
EXPORT_SYMBOL(swiotlb_dma_supported);