Revert "[IA64] swiotlb abstraction (e.g. for Xen)"

This reverts commit 51099005.

include/asm-ia64/swiotlb.h

-#ifndef _ASM_SWIOTLB_H
-#define _ASM_SWIOTLB_H 1
-
-#include <asm/machvec.h>
-
-#define SWIOTLB_ARCH_NEED_LATE_INIT
-#define SWIOTLB_ARCH_NEED_ALLOC
-
-#endif /* _ASM_SWIOTLB_H */

include/asm-x86_64/swiotlb.h

@@ -44,7 +44,6 @@ extern void swiotlb_init(void);
 extern int swiotlb_force;
 
 #ifdef CONFIG_SWIOTLB
-#define SWIOTLB_ARCH_NEED_ALLOC
 extern int swiotlb;
 #else
 #define swiotlb 0

lib/swiotlb.c

@@ -28,7 +28,6 @@
 #include <asm/io.h>
 #include <asm/dma.h>
 #include <asm/scatterlist.h>
-#include <asm/swiotlb.h>
 
 #include <linux/init.h>
 #include <linux/bootmem.h>
@@ -36,10 +35,8 @@
 #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_bus(SG_ENT_VIRT_ADDRESS(sg))
-#endif
 
 /*
  * Maximum allowable number of contiguous slabs to map,
@@ -104,25 +101,13 @@ static unsigned int io_tlb_index;
  * We need to save away the original address corresponding to a mapped entry
  * for the sync operations.
  */
-#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;
+static unsigned char **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)
 {
@@ -137,25 +122,9 @@ 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.
@@ -169,8 +138,6 @@ swiotlb_init_with_default_size(size_t default_size)
 		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;
 
@@ -188,14 +155,10 @@ swiotlb_init_with_default_size(size_t default_size)
 	 * 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++) {
-		if ( !(i % IO_TLB_SEGSIZE) )
-			swiotlb_adjust_seg(io_tlb_start + (i << IO_TLB_SHIFT),
-				IO_TLB_SEGSIZE << IO_TLB_SHIFT);
+	for (i = 0; i < io_tlb_nslabs; i++)
  		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(io_tlb_addr_t));
+	io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *));
 
 	/*
 	 * Get the overflow emergency buffer
@@ -203,21 +166,17 @@ swiotlb_init_with_default_size(size_t default_size)
 	io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
 	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);
+	printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n",
+	       virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
 }
-#ifndef __swiotlb_init_with_default_size
-#define __swiotlb_init_with_default_size swiotlb_init_with_default_size
-#endif
 
 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.
@@ -275,12 +234,12 @@ swiotlb_late_init_with_default_size(size_t default_size)
  		io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
 	io_tlb_index = 0;
 
-	io_tlb_orig_addr = (io_tlb_addr_t *)__get_free_pages(GFP_KERNEL,
-	                           get_order(io_tlb_nslabs * sizeof(io_tlb_addr_t)));
+	io_tlb_orig_addr = (unsigned char **)__get_free_pages(GFP_KERNEL,
+	                           get_order(io_tlb_nslabs * sizeof(char *)));
 	if (!io_tlb_orig_addr)
 		goto cleanup3;
 
-	memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(io_tlb_addr_t));
+	memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(char *));
 
 	/*
 	 * Get the overflow emergency buffer
@@ -290,17 +249,19 @@ swiotlb_late_init_with_default_size(size_t default_size)
 	if (!io_tlb_overflow_buffer)
 		goto cleanup4;
 
-	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));
 
 	return 0;
 
 cleanup4:
-	free_pages((unsigned long)io_tlb_orig_addr,
-		   get_order(io_tlb_nslabs * sizeof(io_tlb_addr_t)));
+	free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
+	                                                      sizeof(char *)));
 	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;
 cleanup2:
 	io_tlb_end = NULL;
@@ -310,9 +271,7 @@ cleanup1:
 	io_tlb_nslabs = req_nslabs;
 	return -ENOMEM;
 }
-#endif
 
-#ifndef SWIOTLB_ARCH_HAS_NEEDS_MAPPING
 static int
 address_needs_mapping(struct device *hwdev, dma_addr_t addr)
 {
@@ -323,35 +282,11 @@ 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, io_tlb_addr_t buffer, size_t size, int dir)
+map_single(struct device *hwdev, char *buffer, size_t size, int dir)
 {
 	unsigned long flags;
 	char *dma_addr;
@@ -424,7 +359,7 @@ map_single(struct device *hwdev, io_tlb_addr_t buffer, size_t size, int dir)
 	 */
 	io_tlb_orig_addr[index] = buffer;
 	if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
-		__sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
+		memcpy(dma_addr, buffer, size);
 
 	return dma_addr;
 }
@@ -438,18 +373,17 @@ unmap_single(struct device *hwdev, char *dma_addr, size_t size, int 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;
-	io_tlb_addr_t buffer = io_tlb_orig_addr[index];
+	char *buffer = io_tlb_orig_addr[index];
 
 	/*
 	 * First, sync the memory before unmapping the entry
 	 */
-	if (!swiotlb_orig_addr_null(buffer)
-	    && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
+	if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
 		/*
 		 * bounce... copy the data back into the original buffer * and
 		 * delete the bounce buffer.
 		 */
-		__sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
+		memcpy(buffer, dma_addr, size);
 
 	/*
 	 * Return the buffer to the free list by setting the corresponding
@@ -482,18 +416,18 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size,
 	    int dir, int target)
 {
 	int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
-	io_tlb_addr_t buffer = io_tlb_orig_addr[index];
+	char *buffer = io_tlb_orig_addr[index];
 
 	switch (target) {
 	case SYNC_FOR_CPU:
 		if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
-			__sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
+			memcpy(buffer, dma_addr, size);
 		else
 			BUG_ON(dir != DMA_TO_DEVICE);
 		break;
 	case SYNC_FOR_DEVICE:
 		if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
-			__sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
+			memcpy(dma_addr, buffer, size);
 		else
 			BUG_ON(dir != DMA_FROM_DEVICE);
 		break;
@@ -502,8 +436,6 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size,
 	}
 }
 
-#ifdef SWIOTLB_ARCH_NEED_ALLOC
-
 void *
 swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 		       dma_addr_t *dma_handle, gfp_t flags)
@@ -519,10 +451,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	 */
 	flags |= GFP_DMA;
 
-	if (!order_needs_mapping(order))
-		ret = (void *)__get_free_pages(flags, order);
-	else
-		ret = NULL;
+	ret = (void *)__get_free_pages(flags, order);
 	if (ret && address_needs_mapping(hwdev, virt_to_bus(ret))) {
 		/*
 		 * The allocated memory isn't reachable by the device.
@@ -560,7 +489,6 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	*dma_handle = dev_addr;
 	return ret;
 }
-EXPORT_SYMBOL(swiotlb_alloc_coherent);
 
 void
 swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
@@ -573,9 +501,6 @@ 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)
@@ -617,14 +542,13 @@ swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir)
 	 * we can safely return the device addr and not worry about bounce
 	 * buffering it.
 	 */
-	if (!range_needs_mapping(ptr, size)
-	    && !address_needs_mapping(hwdev, dev_addr))
+	if (!address_needs_mapping(hwdev, dev_addr) && !swiotlb_force)
 		return dev_addr;
 
 	/*
 	 * Oh well, have to allocate and map a bounce buffer.
 	 */
-	map = map_single(hwdev, ptr_to_io_tlb_addr(ptr), size, dir);
+	map = map_single(hwdev, ptr, size, dir);
 	if (!map) {
 		swiotlb_full(hwdev, size, dir, 1);
 		map = io_tlb_overflow_buffer;
@@ -752,16 +676,17 @@ int
 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
 	       int dir)
 {
+	void *addr;
 	dma_addr_t dev_addr;
 	int i;
 
 	BUG_ON(dir == DMA_NONE);
 
 	for (i = 0; i < nelems; i++, sg++) {
-		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);
+		addr = SG_ENT_VIRT_ADDRESS(sg);
+		dev_addr = virt_to_bus(addr);
+		if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) {
+			void *map = map_single(hwdev, addr, sg->length, dir);
 			if (!map) {
 				/* Don't panic here, we expect map_sg users
 				   to do proper error handling. */
@@ -835,44 +760,6 @@ swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 	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)
 {
@@ -885,13 +772,10 @@ swiotlb_dma_mapping_error(dma_addr_t dma_addr)
  * 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)
 {
-	return __swiotlb_dma_supported(hwdev, mask);
+	return virt_to_bus(io_tlb_end - 1) <= mask;
 }
 
 EXPORT_SYMBOL(swiotlb_init);
@@ -906,4 +790,6 @@ EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
 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);