#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/highmem.h>
+#include <linux/gfp.h>
#include <asm/io.h>
#include <asm/dma.h>
*/
static DEFINE_SPINLOCK(io_tlb_lock);
+static int late_alloc;
+
static int __init
setup_io_tlb_npages(char *str)
{
++str;
if (!strcmp(str, "force"))
swiotlb_force = 1;
+
return 1;
}
__setup("swiotlb=", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
-dma_addr_t __weak swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
-{
- return paddr;
-}
-
-phys_addr_t __weak swiotlb_bus_to_phys(struct device *hwdev, dma_addr_t baddr)
-{
- return baddr;
-}
-
+/* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address)
{
- return swiotlb_phys_to_bus(hwdev, virt_to_phys(address));
-}
-
-void * __weak swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t address)
-{
- return phys_to_virt(swiotlb_bus_to_phys(hwdev, address));
-}
-
-int __weak swiotlb_arch_address_needs_mapping(struct device *hwdev,
- dma_addr_t addr, size_t size)
-{
- return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
+ return phys_to_dma(hwdev, virt_to_phys(address));
}
-static void swiotlb_print_info(unsigned long bytes)
+void swiotlb_print_info(void)
{
+ unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
phys_addr_t pstart, pend;
pstart = virt_to_phys(io_tlb_start);
* structures for the software IO TLB used to implement the DMA API.
*/
void __init
-swiotlb_init_with_default_size(size_t default_size)
+swiotlb_init_with_default_size(size_t default_size, int verbose)
{
unsigned long i, bytes;
io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
if (!io_tlb_overflow_buffer)
panic("Cannot allocate SWIOTLB overflow buffer!\n");
-
- swiotlb_print_info(bytes);
+ if (verbose)
+ swiotlb_print_info();
}
void __init
-swiotlb_init(void)
+swiotlb_init(int verbose)
{
- swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
+ swiotlb_init_with_default_size(64 * (1<<20), verbose); /* default to 64MB */
}
/*
if (!io_tlb_overflow_buffer)
goto cleanup4;
- swiotlb_print_info(bytes);
+ swiotlb_print_info();
+
+ late_alloc = 1;
return 0;
return -ENOMEM;
}
-static inline int
-address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size)
+void __init swiotlb_free(void)
{
- return swiotlb_arch_address_needs_mapping(hwdev, addr, size);
+ if (!io_tlb_overflow_buffer)
+ return;
+
+ if (late_alloc) {
+ free_pages((unsigned long)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,
+ get_order(io_tlb_nslabs << IO_TLB_SHIFT));
+ } else {
+ free_bootmem_late(__pa(io_tlb_overflow_buffer),
+ io_tlb_overflow);
+ free_bootmem_late(__pa(io_tlb_orig_addr),
+ io_tlb_nslabs * sizeof(phys_addr_t));
+ free_bootmem_late(__pa(io_tlb_list),
+ io_tlb_nslabs * sizeof(int));
+ free_bootmem_late(__pa(io_tlb_start),
+ io_tlb_nslabs << IO_TLB_SHIFT);
+ }
}
-static int is_swiotlb_buffer(char *addr)
+static int is_swiotlb_buffer(phys_addr_t paddr)
{
- return addr >= io_tlb_start && addr < io_tlb_end;
+ return paddr >= virt_to_phys(io_tlb_start) &&
+ paddr < virt_to_phys(io_tlb_end);
}
/*
/*
* Return the buffer to the free list by setting the corresponding
- * entries to indicate the number of contigous entries available.
+ * entries to indicate the number of contiguous entries available.
* While returning the entries to the free list, we merge the entries
* with slots below and above the pool being returned.
*/
dma_mask = hwdev->coherent_dma_mask;
ret = (void *)__get_free_pages(flags, order);
- if (ret &&
- !is_buffer_dma_capable(dma_mask, swiotlb_virt_to_bus(hwdev, ret),
- size)) {
+ if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) {
/*
* The allocated memory isn't reachable by the device.
*/
dev_addr = swiotlb_virt_to_bus(hwdev, ret);
/* Confirm address can be DMA'd by device */
- if (!is_buffer_dma_capable(dma_mask, dev_addr, size)) {
+ 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);
void
swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
- dma_addr_t dma_handle)
+ dma_addr_t dev_addr)
{
+ phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
WARN_ON(irqs_disabled());
- if (!is_swiotlb_buffer(vaddr))
- free_pages((unsigned long) vaddr, get_order(size));
+ if (!is_swiotlb_buffer(paddr))
+ free_pages((unsigned long)vaddr, get_order(size));
else
/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at "
"device %s\n", size, dev ? dev_name(dev) : "?");
- if (size > io_tlb_overflow && do_panic) {
- if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
- panic("DMA: Memory would be corrupted\n");
- if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
- panic("DMA: Random memory would be DMAed\n");
- }
+ if (size <= io_tlb_overflow || !do_panic)
+ return;
+
+ if (dir == DMA_BIDIRECTIONAL)
+ panic("DMA: Random memory could be DMA accessed\n");
+ if (dir == DMA_FROM_DEVICE)
+ panic("DMA: Random memory could be DMA written\n");
+ if (dir == DMA_TO_DEVICE)
+ panic("DMA: Random memory could be DMA read\n");
}
/*
struct dma_attrs *attrs)
{
phys_addr_t phys = page_to_phys(page) + offset;
- dma_addr_t dev_addr = swiotlb_phys_to_bus(dev, phys);
+ dma_addr_t dev_addr = phys_to_dma(dev, phys);
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(dev, dev_addr, size) && !swiotlb_force)
+ if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
return dev_addr;
/*
/*
* Ensure that the address returned is DMA'ble
*/
- if (address_needs_mapping(dev, dev_addr, size))
+ if (!dma_capable(dev, dev_addr, size))
panic("map_single: bounce buffer is not DMA'ble");
return dev_addr;
static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir)
{
- char *dma_addr = swiotlb_bus_to_virt(hwdev, dev_addr);
+ phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
BUG_ON(dir == DMA_NONE);
- if (is_swiotlb_buffer(dma_addr)) {
- do_unmap_single(hwdev, dma_addr, size, dir);
+ if (is_swiotlb_buffer(paddr)) {
+ do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
return;
}
if (dir != DMA_FROM_DEVICE)
return;
- dma_mark_clean(dma_addr, size);
+ /*
+ * phys_to_virt doesn't work with hihgmem page but we could
+ * call dma_mark_clean() with hihgmem page here. However, we
+ * are fine since dma_mark_clean() is null on POWERPC. We can
+ * make dma_mark_clean() take a physical address if necessary.
+ */
+ dma_mark_clean(phys_to_virt(paddr), size);
}
void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir, int target)
{
- char *dma_addr = swiotlb_bus_to_virt(hwdev, dev_addr);
+ phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
BUG_ON(dir == DMA_NONE);
- if (is_swiotlb_buffer(dma_addr)) {
- sync_single(hwdev, dma_addr, size, dir, target);
+ if (is_swiotlb_buffer(paddr)) {
+ sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
return;
}
if (dir != DMA_FROM_DEVICE)
return;
- dma_mark_clean(dma_addr, size);
+ dma_mark_clean(phys_to_virt(paddr), size);
}
void
for_each_sg(sgl, sg, nelems, i) {
phys_addr_t paddr = sg_phys(sg);
- dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr);
+ dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
if (swiotlb_force ||
- address_needs_mapping(hwdev, dev_addr, sg->length)) {
+ !dma_capable(hwdev, dev_addr, sg->length)) {
void *map = map_single(hwdev, sg_phys(sg),
sg->length, dir);
if (!map) {
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff