Commit 756f7bc6 authored by Jesse Barnes's avatar Jesse Barnes Committed by Jesse Barnes
Browse files

Merge branch 'core/generic-dma-coherent' of... 

Merge branch 'core/generic-dma-coherent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip into for-linus
parents 979b1791 cb28a1bb

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ config ARM 
	select HAVE_KRETPROBES if (HAVE_KPROBES)

	select HAVE_FTRACE if (!XIP_KERNEL)

	select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)

	select HAVE_GENERIC_DMA_COHERENT

	help

	  The ARM series is a line of low-power-consumption RISC chip designs

	  licensed by ARM Ltd and targeted at embedded applications and

arch/arm/mm/consistent.c

+8 −0
Original line number Diff line number Diff line
@@ -274,6 +274,11 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, 
void *

dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)

{

	void *memory;



	if (dma_alloc_from_coherent(dev, size, handle, &memory))

		return memory;



	if (arch_is_coherent()) {

		void *virt;
@@ -362,6 +367,9 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr 


	WARN_ON(irqs_disabled());



	if (dma_release_from_coherent(dev, get_order(size), cpu_addr))

		return;



	if (arch_is_coherent()) {

		kfree(cpu_addr);

		return;

arch/cris/arch-v32/drivers/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -641,6 +641,7 @@ config PCI 
       bool

       depends on ETRAX_CARDBUS

       default y

       select HAVE_GENERIC_DMA_COHERENT



config ETRAX_IOP_FW_LOAD

	tristate "IO-processor hotplug firmware loading support"

arch/cris/arch-v32/drivers/pci/dma.c

+3 −103
Original line number Diff line number Diff line
@@ -15,35 +15,16 @@ 
#include <linux/pci.h>

#include <asm/io.h>



struct dma_coherent_mem {

	void		*virt_base;

	u32		device_base;

	int		size;

	int		flags;

	unsigned long	*bitmap;

};



void *dma_alloc_coherent(struct device *dev, size_t size,

			   dma_addr_t *dma_handle, gfp_t gfp)

{

	void *ret;

	struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;

	int order = get_order(size);

	/* ignore region specifiers */

	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);



	if (mem) {

		int page = bitmap_find_free_region(mem->bitmap, mem->size,

						     order);

		if (page >= 0) {

			*dma_handle = mem->device_base + (page << PAGE_SHIFT);

			ret = mem->virt_base + (page << PAGE_SHIFT);

			memset(ret, 0, size);

	if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))

		return ret;

		}

		if (mem->flags & DMA_MEMORY_EXCLUSIVE)

			return NULL;

	}



	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))

		gfp |= GFP_DMA;
@@ -60,90 +41,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size, 
void dma_free_coherent(struct device *dev, size_t size,

			 void *vaddr, dma_addr_t dma_handle)

{

	struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;

	int order = get_order(size);



	if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) {

		int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;



		bitmap_release_region(mem->bitmap, page, order);

	} else

	if (!dma_release_from_coherent(dev, order, vaddr))

		free_pages((unsigned long)vaddr, order);

}

int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,

				dma_addr_t device_addr, size_t size, int flags)

{

	void __iomem *mem_base;

	int pages = size >> PAGE_SHIFT;

	int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);



	if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)

		goto out;

	if (!size)

		goto out;

	if (dev->dma_mem)

		goto out;



	/* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */



	mem_base = ioremap(bus_addr, size);

	if (!mem_base)

		goto out;



	dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);

	if (!dev->dma_mem)

		goto iounmap_out;

	dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);

	if (!dev->dma_mem->bitmap)

		goto free1_out;



	dev->dma_mem->virt_base = mem_base;

	dev->dma_mem->device_base = device_addr;

	dev->dma_mem->size = pages;

	dev->dma_mem->flags = flags;



	if (flags & DMA_MEMORY_MAP)

		return DMA_MEMORY_MAP;



	return DMA_MEMORY_IO;



 free1_out:

	kfree(dev->dma_mem);

 iounmap_out:

	iounmap(mem_base);

 out:

	return 0;

}

EXPORT_SYMBOL(dma_declare_coherent_memory);



void dma_release_declared_memory(struct device *dev)

{

	struct dma_coherent_mem *mem = dev->dma_mem;



	if(!mem)

		return;

	dev->dma_mem = NULL;

	iounmap(mem->virt_base);

	kfree(mem->bitmap);

	kfree(mem);

}

EXPORT_SYMBOL(dma_release_declared_memory);



void *dma_mark_declared_memory_occupied(struct device *dev,

					dma_addr_t device_addr, size_t size)

{

	struct dma_coherent_mem *mem = dev->dma_mem;

	int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1) >> PAGE_SHIFT;

	int pos, err;



	if (!mem)

		return ERR_PTR(-EINVAL);



	pos = (device_addr - mem->device_base) >> PAGE_SHIFT;

	err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages));

	if (err != 0)

		return ERR_PTR(err);

	return mem->virt_base + (pos << PAGE_SHIFT);

}

EXPORT_SYMBOL(dma_mark_declared_memory_occupied);

arch/sh/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ config SUPERH 
	select HAVE_CLK

	select HAVE_IDE

	select HAVE_OPROFILE

	select HAVE_GENERIC_DMA_COHERENT

	help

	  The SuperH is a RISC processor targeted for use in embedded systems

	  and consumer electronics; it was also used in the Sega Dreamcast