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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-10-15 10:19:39 -0700
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-10-30 09:32:06 -0400
commite05ed4d1fad9e730995abb08cb9bc3bffac5018b (patch)
tree72a2662e8b85308bad057c904a5231d890d7fbba /lib
parentee3f6ba896c7e62004b677b0018a0b29b9b26472 (diff)
downloadvexpress-lsk-e05ed4d1fad9e730995abb08cb9bc3bffac5018b.tar.gz
swiotlb: Return physical addresses when calling swiotlb_tbl_map_single
This change makes it so that swiotlb_tbl_map_single will return a physical address instead of a virtual address when called. The advantage to this once again is that we are avoiding a number of virt_to_phys and phys_to_virt translations by working with everything as a physical address. One change I had to make in order to support using physical addresses is that I could no longer trust 0 to be a invalid physical address on all platforms. So instead I made it so that ~0 is returned on error. This should never be a valid return value as it implies that only one byte would be available for use. In order to clarify things since we now have 2 physical addresses in use inside of swiotlb_tbl_map_single I am renaming phys to orig_addr, and dma_addr to tlb_addr. This way is should be clear that orig_addr is contained within io_orig_addr and tlb_addr is an address within the io_tlb_addr buffer. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/swiotlb.c78
1 files changed, 40 insertions, 38 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index f8c0d4e1d1d..3adc148bb8d 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -393,12 +393,13 @@ void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t 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;
@@ -462,7 +463,7 @@ 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 = (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
@@ -480,7 +481,7 @@ 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);
@@ -490,11 +491,12 @@ 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, phys_to_virt(tlb_addr), size,
+ DMA_TO_DEVICE);
- return dma_addr;
+ return tlb_addr;
}
EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single);
@@ -502,9 +504,8 @@ 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);
@@ -598,12 +599,15 @@ 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) {
/*
@@ -611,13 +615,13 @@ 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;
- }
- 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) {
@@ -629,7 +633,10 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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);
@@ -686,9 +693,8 @@ 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);
/*
@@ -699,22 +705,18 @@ 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);
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);
+ swiotlb_tbl_unmap_single(dev, phys_to_virt(map), size, dir);
return phys_to_dma(dev, io_tlb_overflow_buffer);
}
@@ -840,9 +842,9 @@ 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);
@@ -851,7 +853,7 @@ 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;