/*
* 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>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/scatterlist.h>
+#include <asm/swiotlb.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#define OFFSET(val,align) ((unsigned long) \
( (val) & ( (align) - 1)))
+#ifndef SG_ENT_VIRT_ADDRESS
#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset)
-#define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG))
+#define SG_ENT_PHYS_ADDRESS(sg) virt_to_bus(SG_ENT_VIRT_ADDRESS(sg))
+#endif
/*
* Maximum allowable number of contiguous slabs to map,
* We need to save away the original address corresponding to a mapped entry
* for the sync operations.
*/
-static unsigned char **io_tlb_orig_addr;
+#ifndef SWIOTLB_ARCH_HAS_IO_TLB_ADDR_T
+typedef char *io_tlb_addr_t;
+#define swiotlb_orig_addr_null(buffer) (!(buffer))
+#define ptr_to_io_tlb_addr(ptr) (ptr)
+#define page_to_io_tlb_addr(pg, off) (page_address(pg) + (off))
+#define sg_to_io_tlb_addr(sg) SG_ENT_VIRT_ADDRESS(sg)
+#endif
+static io_tlb_addr_t *io_tlb_orig_addr;
/*
* Protect the above data structures in the map and unmap calls
*/
static DEFINE_SPINLOCK(io_tlb_lock);
+#ifdef SWIOTLB_EXTRA_VARIABLES
+SWIOTLB_EXTRA_VARIABLES;
+#endif
+
+#ifndef SWIOTLB_ARCH_HAS_SETUP_IO_TLB_NPAGES
static int __init
setup_io_tlb_npages(char *str)
{
swiotlb_force = 1;
return 1;
}
+#endif
__setup("swiotlb=", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
+#ifndef swiotlb_adjust_size
+#define swiotlb_adjust_size(size) ((void)0)
+#endif
+
+#ifndef swiotlb_adjust_seg
+#define swiotlb_adjust_seg(start, size) ((void)0)
+#endif
+
+#ifndef swiotlb_print_info
+#define swiotlb_print_info(bytes) \
+ 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))
+#endif
+
/*
* 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);
}
+ swiotlb_adjust_size(io_tlb_nslabs);
+ swiotlb_adjust_size(io_tlb_overflow);
+
+ 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
* between io_tlb_start and io_tlb_end.
*/
io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
- for (i = 0; i < io_tlb_nslabs; i++)
+ for (i = 0; i < io_tlb_nslabs; i++) {
+ if ( !(i % IO_TLB_SEGSIZE) )
+ swiotlb_adjust_seg(io_tlb_start + (i << IO_TLB_SHIFT),
+ IO_TLB_SEGSIZE << IO_TLB_SHIFT);
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(char *));
+ io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(io_tlb_addr_t));
/*
* Get the overflow emergency buffer
*/
io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
- printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n",
- virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end));
+ if (!io_tlb_overflow_buffer)
+ panic("Cannot allocate SWIOTLB overflow buffer!\n");
+ swiotlb_adjust_seg(io_tlb_overflow_buffer, io_tlb_overflow);
+
+ swiotlb_print_info(bytes);
}
+#ifndef __swiotlb_init_with_default_size
+#define __swiotlb_init_with_default_size swiotlb_init_with_default_size
+#endif
-void
-swiotlb_init (void)
+void __init
+swiotlb_init(void)
{
- swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
+ __swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
}
+#ifdef SWIOTLB_ARCH_NEED_LATE_INIT
/*
* Systems with larger DMA zones (those that don't support ISA) can
* initialize the swiotlb later using the slab allocator if needed.
* 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) {
/*
* 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,
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
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_index = 0;
- io_tlb_orig_addr = (unsigned char **)__get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs * sizeof(char *)));
+ io_tlb_orig_addr = (io_tlb_addr_t *)__get_free_pages(GFP_KERNEL,
+ get_order(io_tlb_nslabs * sizeof(io_tlb_addr_t)));
if (!io_tlb_orig_addr)
goto cleanup3;
- memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(char *));
+ memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(io_tlb_addr_t));
/*
* Get the overflow emergency buffer
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,
- virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end));
+ swiotlb_print_info(bytes);
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(io_tlb_addr_t)));
io_tlb_orig_addr = NULL;
cleanup3:
- free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
- sizeof(int)));
+ 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:
io_tlb_nslabs = req_nslabs;
return -ENOMEM;
}
+#endif
+#ifndef SWIOTLB_ARCH_HAS_NEEDS_MAPPING
static inline int
address_needs_mapping(struct device *hwdev, dma_addr_t addr)
{
return (addr & ~mask) != 0;
}
+static inline int range_needs_mapping(const void *ptr, size_t size)
+{
+ return swiotlb_force;
+}
+
+static inline int order_needs_mapping(unsigned int order)
+{
+ return 0;
+}
+#endif
+
+static void
+__sync_single(io_tlb_addr_t buffer, char *dma_addr, size_t size, int dir)
+{
+#ifndef SWIOTLB_ARCH_HAS_SYNC_SINGLE
+ if (dir == DMA_TO_DEVICE)
+ memcpy(dma_addr, buffer, size);
+ else
+ memcpy(buffer, dma_addr, size);
+#else
+ __swiotlb_arch_sync_single(buffer, dma_addr, size, dir);
+#endif
+}
+
/*
* Allocates bounce buffer and returns its kernel virtual address.
*/
static void *
-map_single(struct device *hwdev, char *buffer, size_t size, int dir)
+map_single(struct device *hwdev, io_tlb_addr_t buffer, size_t size, int dir)
{
unsigned long flags;
char *dma_addr;
*/
io_tlb_orig_addr[index] = buffer;
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
- memcpy(dma_addr, buffer, size);
+ __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
return dma_addr;
}
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;
- char *buffer = io_tlb_orig_addr[index];
+ io_tlb_addr_t buffer = io_tlb_orig_addr[index];
/*
* First, sync the memory before unmapping the entry
*/
- if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
+ if (!swiotlb_orig_addr_null(buffer)
+ && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
/*
* bounce... copy the data back into the original buffer * and
* delete the bounce buffer.
*/
- memcpy(buffer, dma_addr, size);
+ __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
/*
* Return the buffer to the free list by setting the corresponding
int dir, int target)
{
int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
- char *buffer = io_tlb_orig_addr[index];
+ io_tlb_addr_t buffer = io_tlb_orig_addr[index];
switch (target) {
case SYNC_FOR_CPU:
if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
- memcpy(buffer, dma_addr, size);
+ __sync_single(buffer, 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))
- memcpy(dma_addr, buffer, size);
+ __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
else
BUG_ON(dir != DMA_FROM_DEVICE);
break;
}
}
+#ifdef SWIOTLB_ARCH_NEED_ALLOC
+
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);
*/
flags |= GFP_DMA;
- ret = (void *)__get_free_pages(flags, order);
- if (ret && address_needs_mapping(hwdev, virt_to_phys(ret))) {
+ if (!order_needs_mapping(order))
+ ret = (void *)__get_free_pages(flags, order);
+ else
+ ret = NULL;
+ if (ret && address_needs_mapping(hwdev, virt_to_bus(ret))) {
/*
* The allocated memory isn't reachable by the device.
* Fall back on swiotlb_map_single().
if (swiotlb_dma_mapping_error(handle))
return NULL;
- ret = phys_to_virt(handle);
+ ret = bus_to_virt(handle);
}
memset(ret, 0, size);
- dev_addr = virt_to_phys(ret);
+ dev_addr = virt_to_bus(ret);
/* 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");
}
*dma_handle = dev_addr;
return ret;
}
+EXPORT_SYMBOL(swiotlb_alloc_coherent);
void
swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
swiotlb_unmap_single (hwdev, dma_handle, size, DMA_TO_DEVICE);
}
+EXPORT_SYMBOL(swiotlb_free_coherent);
+
+#endif
static void
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) {
dma_addr_t
swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir)
{
- unsigned long dev_addr = virt_to_phys(ptr);
+ dma_addr_t dev_addr = virt_to_bus(ptr);
void *map;
BUG_ON(dir == DMA_NONE);
* we can safely return the device addr and not worry about bounce
* buffering it.
*/
- if (!address_needs_mapping(hwdev, dev_addr) && !swiotlb_force)
+ if (!range_needs_mapping(ptr, size)
+ && !address_needs_mapping(hwdev, dev_addr))
return dev_addr;
/*
* Oh well, have to allocate and map a bounce buffer.
*/
- map = map_single(hwdev, ptr, size, dir);
+ map = map_single(hwdev, ptr_to_io_tlb_addr(ptr), size, dir);
if (!map) {
swiotlb_full(hwdev, size, dir, 1);
map = io_tlb_overflow_buffer;
}
- dev_addr = virt_to_phys(map);
+ dev_addr = virt_to_bus(map);
/*
* Ensure that the address returned is DMA'ble
return dev_addr;
}
-/*
- * Since DMA is i-cache coherent, any (complete) pages that were written via
- * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
- * flush them when they get mapped into an executable vm-area.
- */
-static void
-mark_clean(void *addr, size_t size)
-{
- unsigned long pg_addr, end;
-
- pg_addr = PAGE_ALIGN((unsigned long) addr);
- end = (unsigned long) addr + size;
- while (pg_addr + PAGE_SIZE <= end) {
- struct page *page = virt_to_page(pg_addr);
- set_bit(PG_arch_1, &page->flags);
- pg_addr += PAGE_SIZE;
- }
-}
-
/*
* Unmap a single streaming mode DMA translation. The dma_addr and size must
* match what was provided for in a previous swiotlb_map_single call. All
swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size,
int dir)
{
- char *dma_addr = phys_to_virt(dev_addr);
+ char *dma_addr = bus_to_virt(dev_addr);
BUG_ON(dir == DMA_NONE);
if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
unmap_single(hwdev, dma_addr, size, dir);
else if (dir == DMA_FROM_DEVICE)
- mark_clean(dma_addr, size);
+ dma_mark_clean(dma_addr, size);
}
/*
swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir, int target)
{
- char *dma_addr = phys_to_virt(dev_addr);
+ char *dma_addr = bus_to_virt(dev_addr);
BUG_ON(dir == DMA_NONE);
if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
sync_single(hwdev, dma_addr, size, dir, target);
else if (dir == DMA_FROM_DEVICE)
- mark_clean(dma_addr, size);
+ dma_mark_clean(dma_addr, size);
}
void
unsigned long offset, size_t size,
int dir, int target)
{
- char *dma_addr = phys_to_virt(dev_addr) + offset;
+ char *dma_addr = bus_to_virt(dev_addr) + offset;
BUG_ON(dir == DMA_NONE);
if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
sync_single(hwdev, dma_addr, size, dir, target);
else if (dir == DMA_FROM_DEVICE)
- mark_clean(dma_addr, size);
+ dma_mark_clean(dma_addr, size);
}
void
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);
for (i = 0; i < nelems; i++, sg++) {
- addr = SG_ENT_VIRT_ADDRESS(sg);
- dev_addr = virt_to_phys(addr);
- if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) {
- void *map = map_single(hwdev, addr, sg->length, dir);
- sg->dma_address = virt_to_bus(map);
+ dev_addr = SG_ENT_PHYS_ADDRESS(sg);
+ if (range_needs_mapping(SG_ENT_VIRT_ADDRESS(sg), sg->length)
+ || address_needs_mapping(hwdev, dev_addr)) {
+ void *map = map_single(hwdev, sg_to_io_tlb_addr(sg), sg->length, dir);
if (!map) {
/* Don't panic here, we expect map_sg users
to do proper error handling. */
sg[0].dma_length = 0;
return 0;
}
+ sg->dma_address = virt_to_bus(map);
} else
sg->dma_address = dev_addr;
sg->dma_length = sg->length;
for (i = 0; i < nelems; i++, sg++)
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
- unmap_single(hwdev, (void *) phys_to_virt(sg->dma_address), sg->dma_length, dir);
+ unmap_single(hwdev, bus_to_virt(sg->dma_address),
+ sg->dma_length, dir);
else if (dir == DMA_FROM_DEVICE)
- mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
+ dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
}
/*
for (i = 0; i < nelems; i++, sg++)
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
- sync_single(hwdev, (void *) sg->dma_address,
+ sync_single(hwdev, bus_to_virt(sg->dma_address),
sg->dma_length, dir, target);
+ else if (dir == DMA_FROM_DEVICE)
+ dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
}
void
swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
}
+#ifdef SWIOTLB_ARCH_NEED_MAP_PAGE
+
+dma_addr_t
+swiotlb_map_page(struct device *hwdev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction)
+{
+ dma_addr_t dev_addr;
+ char *map;
+
+ dev_addr = page_to_bus(page) + offset;
+ if (address_needs_mapping(hwdev, dev_addr)) {
+ map = map_single(hwdev, page_to_io_tlb_addr(page, offset), size, direction);
+ if (!map) {
+ swiotlb_full(hwdev, size, direction, 1);
+ map = io_tlb_overflow_buffer;
+ }
+ dev_addr = virt_to_bus(map);
+ }
+
+ return dev_addr;
+}
+
+void
+swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, enum dma_data_direction direction)
+{
+ char *dma_addr = bus_to_virt(dev_addr);
+
+ BUG_ON(direction == DMA_NONE);
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ unmap_single(hwdev, dma_addr, size, direction);
+ else if (direction == DMA_FROM_DEVICE)
+ dma_mark_clean(dma_addr, size);
+}
+
+#endif
+
int
swiotlb_dma_mapping_error(dma_addr_t dma_addr)
{
- return (dma_addr == virt_to_phys(io_tlb_overflow_buffer));
+ return (dma_addr == virt_to_bus(io_tlb_overflow_buffer));
}
/*
* during bus mastering, then you would pass 0x00ffffff as the mask to
* this function.
*/
+#ifndef __swiotlb_dma_supported
+#define __swiotlb_dma_supported(hwdev, mask) (virt_to_bus(io_tlb_end - 1) <= (mask))
+#endif
int
-swiotlb_dma_supported (struct device *hwdev, u64 mask)
+swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
- return (virt_to_phys (io_tlb_end) - 1) <= mask;
+ return __swiotlb_dma_supported(hwdev, mask);
}
EXPORT_SYMBOL(swiotlb_init);
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);
Code Review / linux-2.6.git / commitdiff