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Commit 51099005 authored by Jan Beulich's avatar Jan Beulich Committed by Tony Luck
Browse files

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



Add abstraction so that the file can be used by environments other than IA64
and EM64T, namely for Xen.

Signed-off-by: default avatarJan Beulich <jbeulich@novell.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 563aaf06

include/asm-ia64/swiotlb.h

0 → 100644
+9 −0
Original line number Diff line number Diff line 
#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

+1 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ 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

+149 −35
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <asm/io.h>

#include <asm/dma.h>

#include <asm/scatterlist.h>

#include <asm/swiotlb.h>



#include <linux/init.h>

#include <linux/bootmem.h>
@@ -35,8 +36,10 @@ 
#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,
@@ -101,13 +104,25 @@ static unsigned int io_tlb_index; 
 * 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)

{
@@ -122,9 +137,25 @@ 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.
@@ -138,6 +169,8 @@ 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;
@@ -155,10 +188,14 @@ 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++)

	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
@@ -166,17 +203,21 @@ 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);



	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));

	swiotlb_print_info(bytes);

}

#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.
@@ -234,12 +275,12 @@ 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 = (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
@@ -249,19 +290,17 @@ swiotlb_late_init_with_default_size(size_t default_size) 
	if (!io_tlb_overflow_buffer)

		goto cleanup4;



	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));

	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;

cleanup2:

	io_tlb_end = NULL;
@@ -271,7 +310,9 @@ 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)

{
@@ -282,11 +323,35 @@ 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;
@@ -359,7 +424,7 @@ map_single(struct device *hwdev, char *buffer, size_t size, int dir) 
	 */

	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;

}
@@ -373,17 +438,18 @@ 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;

	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
@@ -416,18 +482,18 @@ 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;

	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;
@@ -436,6 +502,8 @@ 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)
@@ -451,7 +519,10 @@ 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;

	if (ret && address_needs_mapping(hwdev, virt_to_bus(ret))) {

		/*

		 * The allocated memory isn't reachable by the device.
@@ -489,6 +560,7 @@ 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,
@@ -501,6 +573,9 @@ 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)
@@ -542,13 +617,14 @@ 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 (!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;
@@ -676,17 +752,16 @@ 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++) {

		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);

		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. */
@@ -760,6 +835,44 @@ 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)

{
@@ -772,10 +885,13 @@ 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 virt_to_bus(io_tlb_end - 1) <= mask;

	return __swiotlb_dma_supported(hwdev, mask);

}



EXPORT_SYMBOL(swiotlb_init);
@@ -790,6 +906,4 @@ 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);