From: Konrad Rzeszutek <konrad@xxxxxxxxxxxxxxxxxxxxx>
In essence, leave in swiotlb-core.c functions dealing with the
bookkeeping of the IOMMU. And functions which are declared in dma_ops
structures are moved over to swiotlb.c.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
lib/swiotlb-core.c | 385 ---------------------------------------------------
lib/swiotlb.c | 391 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 391 insertions(+), 385 deletions(-)
create mode 100644 lib/swiotlb.c
diff --git a/lib/swiotlb-core.c b/lib/swiotlb-core.c
index c982d33..2534d6d 100644
--- a/lib/swiotlb-core.c
+++ b/lib/swiotlb-core.c
@@ -138,13 +138,6 @@ setup_io_tlb_npages(char *str)
}
__setup("swiotlb=", setup_io_tlb_npages);
-/* Note that this doesn't work with highmem page */
-static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
- volatile void *address)
-{
- return phys_to_dma(hwdev, virt_to_phys(address));
-}
-
void swiotlb_print_info(void)
{
unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
@@ -555,76 +548,7 @@ do_sync_single(struct device *hwdev, char *dma_addr,
size_t size,
BUG();
}
}
-
-void *
-swiotlb_alloc_coherent(struct device *hwdev, size_t size,
- dma_addr_t *dma_handle, gfp_t flags)
-{
- dma_addr_t dev_addr;
- void *ret;
- int order = get_order(size);
- u64 dma_mask = DMA_BIT_MASK(32);
- unsigned long start_dma_addr;
-
- if (hwdev && hwdev->coherent_dma_mask)
- 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) {
- /*
- * We are either out of memory or the device can't DMA
- * to GFP_DMA memory; fall back on do_map_single(), which
- * will grab memory from the lowest available address range.
- */
- start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
- ret = do_map_single(hwdev, 0, start_dma_addr, size,
- DMA_FROM_DEVICE);
- if (!ret)
- 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) {
- dev_err(hwdev, "DMA: 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 do_unmap_single */
- do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
- return NULL;
- }
- *dma_handle = dev_addr;
- return ret;
-}
-EXPORT_SYMBOL(swiotlb_alloc_coherent);
-
void
-swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
- dma_addr_t dev_addr)
-{
- phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
- WARN_ON(irqs_disabled());
- if (!is_swiotlb_buffer(paddr))
- free_pages((unsigned long)vaddr, get_order(size));
- else
- /* DMA_TO_DEVICE to avoid memcpy in do_unmap_single */
- do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
-}
-EXPORT_SYMBOL(swiotlb_free_coherent);
-
-static void
swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
{
/*
@@ -646,312 +570,3 @@ swiotlb_full(struct device *dev, size_t size, int dir,
int do_panic)
if (dir == DMA_TO_DEVICE)
panic("DMA: Random memory could be DMA read\n");
}
-
-/*
- * Map a single buffer of the indicated size for DMA in streaming mode. The
- * physical address to use is returned.
- *
- * Once the device is given the dma address, the device owns this memory until
- * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
- */
-dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir,
- struct dma_attrs *attrs)
-{
- unsigned long start_dma_addr;
- phys_addr_t phys = page_to_phys(page) + offset;
- dma_addr_t dev_addr = phys_to_dma(dev, phys);
- void *map;
-
- BUG_ON(dir == DMA_NONE);
- /*
- * If the address happens to be in the device's DMA window,
- * we can safely return the device addr and not worry about bounce
- * buffering it.
- */
- if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
- return dev_addr;
-
- /*
- * Oh well, have to allocate and map a bounce buffer.
- */
- start_dma_addr = swiotlb_virt_to_bus(dev, io_tlb_start);
- map = do_map_single(dev, phys, start_dma_addr, size, dir);
- if (!map) {
- swiotlb_full(dev, size, dir, 1);
- map = io_tlb_overflow_buffer;
- }
-
- dev_addr = swiotlb_virt_to_bus(dev, map);
-
- /*
- * Ensure that the address returned is DMA'ble
- */
- if (!dma_capable(dev, dev_addr, size))
- panic("DMA: swiotlb_map_single: bounce buffer is not DMA'ble");
-
- return dev_addr;
-}
-EXPORT_SYMBOL_GPL(swiotlb_map_page);
-
-/*
- * Unmap a single streaming mode DMA translation. The dma_addr and size must
- * match what was provided for in a previous swiotlb_map_page call. All
- * other usages are undefined.
- *
- * After this call, reads by the cpu to the buffer are guaranteed to see
- * whatever the device wrote there.
- */
-static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, int dir)
-{
- phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
- BUG_ON(dir == DMA_NONE);
-
- if (is_swiotlb_buffer(paddr)) {
- do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
- return;
- }
-
- if (dir != DMA_FROM_DEVICE)
- return;
-
- /*
- * 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,
- size_t size, enum dma_data_direction dir,
- struct dma_attrs *attrs)
-{
- unmap_single(hwdev, dev_addr, size, dir);
-}
-EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
-
-/*
- * Make physical memory consistent for a single streaming mode DMA translation
- * after a transfer.
- *
- * If you perform a swiotlb_map_page() but wish to interrogate the buffer
- * using the cpu, yet do not wish to teardown the dma mapping, you must
- * call this function before doing so. At the next point you give the dma
- * address back to the card, you must first perform a
- * swiotlb_dma_sync_for_device, and then the device again owns the buffer
- */
-static void
-swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, int dir, int target)
-{
- phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
- BUG_ON(dir == DMA_NONE);
-
- if (is_swiotlb_buffer(paddr)) {
- do_sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
- return;
- }
-
- if (dir != DMA_FROM_DEVICE)
- return;
-
- dma_mark_clean(phys_to_virt(paddr), size);
-}
-
-void
-swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir)
-{
- swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
-
-void
-swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir)
-{
- swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
-}
-EXPORT_SYMBOL(swiotlb_sync_single_for_device);
-
-/*
- * Same as above, but for a sub-range of the mapping.
- */
-static void
-swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
- unsigned long offset, size_t size,
- int dir, int target)
-{
- swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
-}
-
-void
-swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
- unsigned long offset, size_t size,
- enum dma_data_direction dir)
-{
- swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
- SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
-
-void
-swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
- unsigned long offset, size_t size,
- enum dma_data_direction dir)
-{
- swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
- SYNC_FOR_DEVICE);
-}
-EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
-
-/*
- * Map a set of buffers described by scatterlist in streaming mode for DMA.
- * This is the scatter-gather version of the above swiotlb_map_page
- * interface. Here the scatter gather list elements are each tagged with the
- * appropriate dma address and length. They are obtained via
- * sg_dma_{address,length}(SG).
- *
- * NOTE: An implementation may be able to use a smaller number of
- * DMA address/length pairs than there are SG table elements.
- * (for example via virtual mapping capabilities)
- * The routine returns the number of addr/length pairs actually
- * used, at most nents.
- *
- * Device ownership issues as mentioned above for swiotlb_map_page are the
- * same here.
- */
-int
-swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
- enum dma_data_direction dir, struct dma_attrs *attrs)
-{
- unsigned long start_dma_addr;
- struct scatterlist *sg;
- int i;
-
- BUG_ON(dir == DMA_NONE);
-
- start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
- for_each_sg(sgl, sg, nelems, i) {
- phys_addr_t paddr = sg_phys(sg);
- dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
-
- if (swiotlb_force ||
- !dma_capable(hwdev, dev_addr, sg->length)) {
- void *map = do_map_single(hwdev, sg_phys(sg),
- start_dma_addr,
- sg->length, dir);
- if (!map) {
- /* Don't panic here, we expect map_sg users
- to do proper error handling. */
- swiotlb_full(hwdev, sg->length, dir, 0);
- swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
- attrs);
- sgl[0].dma_length = 0;
- return 0;
- }
- sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
- } else
- sg->dma_address = dev_addr;
- sg->dma_length = sg->length;
- }
- return nelems;
-}
-EXPORT_SYMBOL(swiotlb_map_sg_attrs);
-
-int
-swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
- int dir)
-{
- return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL(swiotlb_map_sg);
-
-/*
- * Unmap a set of streaming mode DMA translations. Again, cpu read rules
- * concerning calls here are the same as for swiotlb_unmap_page() above.
- */
-void
-swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
- int nelems, enum dma_data_direction dir,
- struct dma_attrs *attrs)
-{
- struct scatterlist *sg;
- int i;
-
- BUG_ON(dir == DMA_NONE);
-
- for_each_sg(sgl, sg, nelems, i)
- unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
-
-}
-EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
-
-void
-swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
- int dir)
-{
- return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
-}
-EXPORT_SYMBOL(swiotlb_unmap_sg);
-
-/*
- * Make physical memory consistent for a set of streaming mode DMA translations
- * after a transfer.
- *
- * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
- * and usage.
- */
-static void
-swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
- int nelems, int dir, int target)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nelems, i)
- swiotlb_sync_single(hwdev, sg->dma_address,
- sg->dma_length, dir, target);
-}
-
-void
-swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
- int nelems, enum dma_data_direction dir)
-{
- swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
-}
-EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
-
-void
-swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
- int nelems, enum dma_data_direction dir)
-{
- swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
-}
-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));
-}
-EXPORT_SYMBOL(swiotlb_dma_mapping_error);
-
-/*
- * Return whether the given device DMA address mask can be supported
- * properly. For example, if your device can only drive the low 24-bits
- * during bus mastering, then you would pass 0x00ffffff as the mask to
- * this function.
- */
-int
-swiotlb_dma_supported(struct device *hwdev, u64 mask)
-{
- return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
-}
-EXPORT_SYMBOL(swiotlb_dma_supported);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
new file mode 100644
index 0000000..f6bbcd1
--- /dev/null
+++ b/lib/swiotlb.c
@@ -0,0 +1,391 @@
+
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/swiotlb.h>
+
+#include <asm/scatterlist.h>
+#include <linux/iommu-helper.h>
+
+
+/* Note that this doesn't work with highmem page */
+static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
+ volatile void *address)
+{
+ return phys_to_dma(hwdev, virt_to_phys(address));
+}
+void *
+swiotlb_alloc_coherent(struct device *hwdev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flags)
+{
+ dma_addr_t dev_addr;
+ void *ret;
+ int order = get_order(size);
+ u64 dma_mask = DMA_BIT_MASK(32);
+ unsigned long start_dma_addr;
+
+ if (hwdev && hwdev->coherent_dma_mask)
+ 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) {
+ /*
+ * We are either out of memory or the device can't DMA
+ * to GFP_DMA memory; fall back on do_map_single(), which
+ * will grab memory from the lowest available address range.
+ */
+ start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
+ ret = do_map_single(hwdev, 0, start_dma_addr, size,
+ DMA_FROM_DEVICE);
+ if (!ret)
+ 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) {
+ dev_err(hwdev, "DMA: 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 do_unmap_single */
+ do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
+ return NULL;
+ }
+ *dma_handle = dev_addr;
+ return ret;
+}
+EXPORT_SYMBOL(swiotlb_alloc_coherent);
+
+void
+swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
+ dma_addr_t dev_addr)
+{
+ phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
+ WARN_ON(irqs_disabled());
+ if (!is_swiotlb_buffer(paddr))
+ free_pages((unsigned long)vaddr, get_order(size));
+ else
+ /* DMA_TO_DEVICE to avoid memcpy in do_unmap_single */
+ do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL(swiotlb_free_coherent);
+
+/*
+ * Map a single buffer of the indicated size for DMA in streaming mode. The
+ * physical address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory until
+ * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
+ */
+dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ unsigned long start_dma_addr;
+ phys_addr_t phys = page_to_phys(page) + offset;
+ dma_addr_t dev_addr = phys_to_dma(dev, phys);
+ void *map;
+
+ BUG_ON(dir == DMA_NONE);
+ /*
+ * If the address happens to be in the device's DMA window,
+ * we can safely return the device addr and not worry about bounce
+ * buffering it.
+ */
+ if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
+ return dev_addr;
+
+ /*
+ * Oh well, have to allocate and map a bounce buffer.
+ */
+ start_dma_addr = swiotlb_virt_to_bus(dev, io_tlb_start);
+ map = do_map_single(dev, phys, start_dma_addr, size, dir);
+ if (!map) {
+ swiotlb_full(dev, size, dir, 1);
+ map = io_tlb_overflow_buffer;
+ }
+
+ dev_addr = swiotlb_virt_to_bus(dev, map);
+
+ /*
+ * Ensure that the address returned is DMA'ble
+ */
+ if (!dma_capable(dev, dev_addr, size))
+ panic("DMA: swiotlb_map_single: bounce buffer is not DMA'ble");
+
+ return dev_addr;
+}
+EXPORT_SYMBOL_GPL(swiotlb_map_page);
+
+/*
+ * Unmap a single streaming mode DMA translation. The dma_addr and size must
+ * match what was provided for in a previous swiotlb_map_page call. All
+ * other usages are undefined.
+ *
+ * After this call, reads by the cpu to the buffer are guaranteed to see
+ * whatever the device wrote there.
+ */
+static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, int dir)
+{
+ phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
+ BUG_ON(dir == DMA_NONE);
+
+ if (is_swiotlb_buffer(paddr)) {
+ do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
+ return;
+ }
+
+ if (dir != DMA_FROM_DEVICE)
+ return;
+
+ /*
+ * 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,
+ size_t size, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ unmap_single(hwdev, dev_addr, size, dir);
+}
+EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
+
+/*
+ * Make physical memory consistent for a single streaming mode DMA translation
+ * after a transfer.
+ *
+ * If you perform a swiotlb_map_page() but wish to interrogate the buffer
+ * using the cpu, yet do not wish to teardown the dma mapping, you must
+ * call this function before doing so. At the next point you give the dma
+ * address back to the card, you must first perform a
+ * swiotlb_dma_sync_for_device, and then the device again owns the buffer
+ */
+static void
+swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, int dir, int target)
+{
+ phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
+
+ BUG_ON(dir == DMA_NONE);
+
+ if (is_swiotlb_buffer(paddr)) {
+ do_sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
+ return;
+ }
+
+ if (dir != DMA_FROM_DEVICE)
+ return;
+
+ dma_mark_clean(phys_to_virt(paddr), size);
+}
+
+void
+swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, enum dma_data_direction dir)
+{
+ swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
+}
+EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
+
+void
+swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, enum dma_data_direction dir)
+{
+ swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
+}
+EXPORT_SYMBOL(swiotlb_sync_single_for_device);
+
+/*
+ * Same as above, but for a sub-range of the mapping.
+ */
+static void
+swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size,
+ int dir, int target)
+{
+ swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
+}
+
+void
+swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir)
+{
+ swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+ SYNC_FOR_CPU);
+}
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
+
+void
+swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir)
+{
+ swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+ SYNC_FOR_DEVICE);
+}
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
+
+/*
+ * Map a set of buffers described by scatterlist in streaming mode for DMA.
+ * This is the scatter-gather version of the above swiotlb_map_page
+ * interface. Here the scatter gather list elements are each tagged with the
+ * appropriate dma address and length. They are obtained via
+ * sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ * DMA address/length pairs than there are SG table elements.
+ * (for example via virtual mapping capabilities)
+ * The routine returns the number of addr/length pairs actually
+ * used, at most nents.
+ *
+ * Device ownership issues as mentioned above for swiotlb_map_page are the
+ * same here.
+ */
+int
+swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
+ enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+ unsigned long start_dma_addr;
+ struct scatterlist *sg;
+ int i;
+
+ BUG_ON(dir == DMA_NONE);
+
+ start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
+ for_each_sg(sgl, sg, nelems, i) {
+ phys_addr_t paddr = sg_phys(sg);
+ dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
+
+ if (swiotlb_force ||
+ !dma_capable(hwdev, dev_addr, sg->length)) {
+ void *map = do_map_single(hwdev, sg_phys(sg),
+ start_dma_addr,
+ sg->length, dir);
+ if (!map) {
+ /* Don't panic here, we expect map_sg users
+ to do proper error handling. */
+ swiotlb_full(hwdev, sg->length, dir, 0);
+ swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
+ attrs);
+ sgl[0].dma_length = 0;
+ return 0;
+ }
+ sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
+ } else
+ sg->dma_address = dev_addr;
+ sg->dma_length = sg->length;
+ }
+ return nelems;
+}
+EXPORT_SYMBOL(swiotlb_map_sg_attrs);
+
+int
+swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
+ int dir)
+{
+ return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
+}
+EXPORT_SYMBOL(swiotlb_map_sg);
+
+/*
+ * Unmap a set of streaming mode DMA translations. Again, cpu read rules
+ * concerning calls here are the same as for swiotlb_unmap_page() above.
+ */
+void
+swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
+ int nelems, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct scatterlist *sg;
+ int i;
+
+ BUG_ON(dir == DMA_NONE);
+
+ for_each_sg(sgl, sg, nelems, i)
+ unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
+
+}
+EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
+
+void
+swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
+ int dir)
+{
+ return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
+}
+EXPORT_SYMBOL(swiotlb_unmap_sg);
+
+/*
+ * Make physical memory consistent for a set of streaming mode DMA translations
+ * after a transfer.
+ *
+ * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
+ * and usage.
+ */
+static void
+swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
+ int nelems, int dir, int target)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, nelems, i)
+ swiotlb_sync_single(hwdev, sg->dma_address,
+ sg->dma_length, dir, target);
+}
+
+void
+swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction dir)
+{
+ swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
+}
+EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
+
+void
+swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction dir)
+{
+ swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
+}
+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));
+}
+EXPORT_SYMBOL(swiotlb_dma_mapping_error);
+
+/*
+ * Return whether the given device DMA address mask can be supported
+ * properly. For example, if your device can only drive the low 24-bits
+ * during bus mastering, then you would pass 0x00ffffff as the mask to
+ * this function.
+ */
+int
+swiotlb_dma_supported(struct device *hwdev, u64 mask)
+{
+ return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
+}
+EXPORT_SYMBOL(swiotlb_dma_supported);
--
1.6.2.5
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