mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
06301c5e0a
Sparc already returns (~(dma_addr_t)0x0) on mapping failures, so we can switch over to returning DMA_MAPPING_ERROR and let the core dma-mapping code handle the rest. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
|
|
*
|
|
* Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
|
|
#ifndef _IOMMU_COMMON_H
|
|
#define _IOMMU_COMMON_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/device.h>
|
|
#include <linux/iommu-helper.h>
|
|
|
|
#include <asm/iommu.h>
|
|
|
|
/*
|
|
* These give mapping size of each iommu pte/tlb.
|
|
*/
|
|
#define IO_PAGE_SHIFT 13
|
|
#define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
|
|
#define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
|
|
#define IO_PAGE_ALIGN(addr) ALIGN(addr, IO_PAGE_SIZE)
|
|
|
|
#define IO_TSB_ENTRIES (128*1024)
|
|
#define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
|
|
|
|
/*
|
|
* This is the hardwired shift in the iotlb tag/data parts.
|
|
*/
|
|
#define IOMMU_PAGE_SHIFT 13
|
|
|
|
#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
|
|
|
|
static inline int is_span_boundary(unsigned long entry,
|
|
unsigned long shift,
|
|
unsigned long boundary_size,
|
|
struct scatterlist *outs,
|
|
struct scatterlist *sg)
|
|
{
|
|
unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
|
|
int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,
|
|
IO_PAGE_SIZE);
|
|
|
|
return iommu_is_span_boundary(entry, nr, shift, boundary_size);
|
|
}
|
|
|
|
#endif /* _IOMMU_COMMON_H */
|