linux/include/asm-ia64/scatterlist.h

#ifndef _ASM_IA64_SCATTERLIST_H
#define _ASM_IA64_SCATTERLIST_H

/*
 * Modified 1998-1999, 2001-2002, 2004
 *	David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
 */

#include <asm/types.h>

struct scatterlist {
#ifdef CONFIG_DEBUG_SG
	unsigned long sg_magic;
#endif
	unsigned long page_link;
	unsigned int offset;
	unsigned int length;	/* buffer length */

	dma_addr_t dma_address;
	unsigned int dma_length;
};

/*
 * It used to be that ISA_DMA_THRESHOLD had something to do with the
 * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
 * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
 * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
 * address of a page is that is allocated with GFP_DMA.  On IA-64,
 * that's 4GB - 1.
 */
#define ISA_DMA_THRESHOLD	0xffffffff

#define sg_dma_len(sg)		((sg)->dma_length)
#define sg_dma_address(sg)	((sg)->dma_address)

#define	ARCH_HAS_SG_CHAIN

#endif /* _ASM_IA64_SCATTERLIST_H */
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 22:20:36 +00:00			`#ifndef _ASM_IA64_SCATTERLIST_H`
			`#define _ASM_IA64_SCATTERLIST_H`

			`/*`
			`* Modified 1998-1999, 2001-2002, 2004`
			`* David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co`
			`*/`

PCI: scatterlist.h needs types.h Most architectures' scatterlist.h use the type dma_addr_t, but omit to include <asm/types.h> which defines it. This could lead to build failures, so let's add the missing includes. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> 2007-03-06 10:45:12 +00:00			`#include <asm/types.h>`

Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 22:20:36 +00:00			`struct scatterlist {`
Add CONFIG_DEBUG_SG sg validation Add a Kconfig entry which will toggle some sanity checks on the sg entry and tables. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> 2007-10-22 18:01:06 +00:00			`#ifdef CONFIG_DEBUG_SG`
			`unsigned long sg_magic;`
			`#endif`
Change table chaining layout Change the page member of the scatterlist structure to be an unsigned long, and encode more stuff in the lower bits: - Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located at sg + 1. - Bit 0 set: this is a chain entry, the next real entry is at ->page_link with the two low bits masked off. - Bit 1 set: this is the final entry in the sg entry. sg_next() will return NULL when passed such an entry. It's thus important that sg table users use the proper accessors to get and set the page member. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> 2007-10-22 17:57:20 +00:00			`unsigned long page_link;`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 22:20:36 +00:00			`unsigned int offset;`
			`unsigned int length; /* buffer length */`

			`dma_addr_t dma_address;`
			`unsigned int dma_length;`
			`};`

			`/*`
			`* It used to be that ISA_DMA_THRESHOLD had something to do with the`
			`* DMA-limits of ISA-devices. Nowadays, its only remaining use (apart`
			`* from the aha1542.c driver, which isn't 64-bit clean anyhow) is to`
			`* tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical`
			`* address of a page is that is allocated with GFP_DMA. On IA-64,`
			`* that's 4GB - 1.`
			`*/`
			`#define ISA_DMA_THRESHOLD 0xffffffff`

[IA64] Move sg_dma_{len,address} from pci.h to scatterlist.h IA64 is in a tiny minority providing these defines in pci.h. Almost everyone else has them in scatterlist.h Signed-off-by: Tony Luck <tony.luck@intel.com> 2006-12-13 21:15:10 +00:00			`#define sg_dma_len(sg) ((sg)->dma_length)`
			`#define sg_dma_address(sg) ((sg)->dma_address)`

IA64: sg chaining support This updates the ia64 iommu/pci dma mappers to sg chaining. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> 2007-10-16 09:27:26 +00:00			`#define ARCH_HAS_SG_CHAIN`

Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 22:20:36 +00:00			`#endif /* _ASM_IA64_SCATTERLIST_H */`