Re: [Xen-devel] Physical address mapping to user space in dom0 problem

["Haw-Yuan Yang" <hawyuan@xxxxxxxxx>]

It still not working. Here is what I did:

 

In driver I have an IOCTL option IO_DMA_ALLOC to allocate the DMA buffer by using pci_alloc_consistent() and return the allocated physical address to user space.

 

In user space testing program:

 

1. Call IOCTL IO_DMA_ALLOC to allocate a 64Kbyte DMA buffer. The physical address of the allocated buffer is 0x03bb0000.

2. Open /dev/mem and call mmap(0,64*1024,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x03bb0000) ;  

 

the return of mmap is -1.

 

 

On 3/16/07, Keir Fraser <keir@xxxxxxxxxxxxx> wrote:

On 16/3/07 23:27, "Haw-Yuan Yang" < hawyuan@xxxxxxxxx> wrote:

Is there any alternative way to map the DMA address to user space in XEN dom0?

Mmap via /dev/mem will work. It uses direct_remap_pfn_range().

 -- Keir

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