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

[Keir Fraser <keir@xxxxxxxxxxxxx>]

You want to mmap() the dma_handle, not the CPU pointer. 

 -- Keir

On 17/3/07 00:36, "Haw-Yuan Yang" <hawyuan@xxxxxxxxx> wrote:

> 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.




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