mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 22:00:53 +07:00
1da177e4c3
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!
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/*
|
|
* DMA region bookkeeping routines
|
|
*
|
|
* Copyright (C) 2002 Maas Digital LLC
|
|
*
|
|
* This code is licensed under the GPL. See the file COPYING in the root
|
|
* directory of the kernel sources for details.
|
|
*/
|
|
|
|
#ifndef IEEE1394_DMA_H
|
|
#define IEEE1394_DMA_H
|
|
|
|
#include <linux/pci.h>
|
|
#include <asm/scatterlist.h>
|
|
|
|
/* struct dma_prog_region
|
|
|
|
a small, physically-contiguous DMA buffer with random-access,
|
|
synchronous usage characteristics
|
|
*/
|
|
|
|
struct dma_prog_region {
|
|
unsigned char *kvirt; /* kernel virtual address */
|
|
struct pci_dev *dev; /* PCI device */
|
|
unsigned int n_pages; /* # of kernel pages */
|
|
dma_addr_t bus_addr; /* base bus address */
|
|
};
|
|
|
|
/* clear out all fields but do not allocate any memory */
|
|
void dma_prog_region_init(struct dma_prog_region *prog);
|
|
int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, struct pci_dev *dev);
|
|
void dma_prog_region_free(struct dma_prog_region *prog);
|
|
|
|
static inline dma_addr_t dma_prog_region_offset_to_bus(struct dma_prog_region *prog, unsigned long offset)
|
|
{
|
|
return prog->bus_addr + offset;
|
|
}
|
|
|
|
/* struct dma_region
|
|
|
|
a large, non-physically-contiguous DMA buffer with streaming,
|
|
asynchronous usage characteristics
|
|
*/
|
|
|
|
struct dma_region {
|
|
unsigned char *kvirt; /* kernel virtual address */
|
|
struct pci_dev *dev; /* PCI device */
|
|
unsigned int n_pages; /* # of kernel pages */
|
|
unsigned int n_dma_pages; /* # of IOMMU pages */
|
|
struct scatterlist *sglist; /* IOMMU mapping */
|
|
int direction; /* PCI_DMA_TODEVICE, etc */
|
|
};
|
|
|
|
/* clear out all fields but do not allocate anything */
|
|
void dma_region_init(struct dma_region *dma);
|
|
|
|
/* allocate the buffer and map it to the IOMMU */
|
|
int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_dev *dev, int direction);
|
|
|
|
/* unmap and free the buffer */
|
|
void dma_region_free(struct dma_region *dma);
|
|
|
|
/* sync the CPU's view of the buffer */
|
|
void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len);
|
|
/* sync the IO bus' view of the buffer */
|
|
void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len);
|
|
|
|
/* map the buffer into a user space process */
|
|
int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma);
|
|
|
|
/* macro to index into a DMA region (or dma_prog_region) */
|
|
#define dma_region_i(_dma, _type, _index) ( ((_type*) ((_dma)->kvirt)) + (_index) )
|
|
|
|
/* return the DMA bus address of the byte with the given offset
|
|
relative to the beginning of the dma_region */
|
|
dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, unsigned long offset);
|
|
|
|
#endif /* IEEE1394_DMA_H */
|