Groups > comp.os.linux.development.system > #207

Re: mmap dma buffer

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From	Pavel Borzenkov <pavel@devio.us>
Newsgroups	comp.os.linux.development.system
Subject	Re: mmap dma buffer
Date	Thu, 7 Jul 2011 10:02:40 +0000 (UTC)
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On 2011-07-07, Pavel Borzenkov <pavel@devio.us> wrote:
>
> You can't convert address returned by pci_alloc_consistent() using
> virt_to_phys() macro. This macro correctly works only for the kernel virtual
> addresses. And this is not needed, actually, because pci_alloc_consistent()
> function returns physical address of the allocated memory in its third
> argument.
>

Sorry. virt_to_phys() works correctly only for kernel *logical* addresses, not
virtual.

-- 
Pavel

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mmap dma buffer new <luvraghu@gmail.com> - 2011-07-06 08:12 -0700
  Re: mmap dma buffer Pavel Borzenkov <pavel@devio.us> - 2011-07-07 09:59 +0000
    Re: mmap dma buffer Pavel Borzenkov <pavel@devio.us> - 2011-07-07 10:02 +0000
      Re: mmap dma buffer new <luvraghu@gmail.com> - 2011-07-07 05:42 -0700
        Re: mmap dma buffer Pavel Borzenkov <pavel@devio.us> - 2011-07-07 13:27 +0000
          Re: mmap dma buffer new <luvraghu@gmail.com> - 2011-07-07 07:46 -0700
            Re: mmap dma buffer Pavel Borzenkov <pavel@devio.us> - 2011-07-08 07:01 +0000
              Re: mmap dma buffer new <luvraghu@gmail.com> - 2011-07-08 03:31 -0700

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