ia64/linux-2.6.18-xen.hg

view drivers/ieee1394/dma.h @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * DMA region bookkeeping routines
3 *
4 * Copyright (C) 2002 Maas Digital LLC
5 *
6 * This code is licensed under the GPL. See the file COPYING in the root
7 * directory of the kernel sources for details.
8 */
10 #ifndef IEEE1394_DMA_H
11 #define IEEE1394_DMA_H
13 #include <linux/pci.h>
14 #include <asm/scatterlist.h>
16 /* struct dma_prog_region
18 a small, physically-contiguous DMA buffer with random-access,
19 synchronous usage characteristics
20 */
22 struct dma_prog_region {
23 unsigned char *kvirt; /* kernel virtual address */
24 struct pci_dev *dev; /* PCI device */
25 unsigned int n_pages; /* # of kernel pages */
26 dma_addr_t bus_addr; /* base bus address */
27 };
29 /* clear out all fields but do not allocate any memory */
30 void dma_prog_region_init(struct dma_prog_region *prog);
31 int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, struct pci_dev *dev);
32 void dma_prog_region_free(struct dma_prog_region *prog);
34 static inline dma_addr_t dma_prog_region_offset_to_bus(struct dma_prog_region *prog, unsigned long offset)
35 {
36 return prog->bus_addr + offset;
37 }
39 /* struct dma_region
41 a large, non-physically-contiguous DMA buffer with streaming,
42 asynchronous usage characteristics
43 */
45 struct dma_region {
46 unsigned char *kvirt; /* kernel virtual address */
47 struct pci_dev *dev; /* PCI device */
48 unsigned int n_pages; /* # of kernel pages */
49 unsigned int n_dma_pages; /* # of IOMMU pages */
50 struct scatterlist *sglist; /* IOMMU mapping */
51 int direction; /* PCI_DMA_TODEVICE, etc */
52 };
54 /* clear out all fields but do not allocate anything */
55 void dma_region_init(struct dma_region *dma);
57 /* allocate the buffer and map it to the IOMMU */
58 int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_dev *dev, int direction);
60 /* unmap and free the buffer */
61 void dma_region_free(struct dma_region *dma);
63 /* sync the CPU's view of the buffer */
64 void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len);
65 /* sync the IO bus' view of the buffer */
66 void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len);
68 /* map the buffer into a user space process */
69 int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma);
71 /* macro to index into a DMA region (or dma_prog_region) */
72 #define dma_region_i(_dma, _type, _index) ( ((_type*) ((_dma)->kvirt)) + (_index) )
74 /* return the DMA bus address of the byte with the given offset
75 relative to the beginning of the dma_region */
76 dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, unsigned long offset);
78 #endif /* IEEE1394_DMA_H */