Re: alsa dma transfer

[Raymond <rayau@netvigator.com>]

Takashi Iwai wrote:
> At Tue, 05 Jul 2005 20:26:49 +0800,
> Raymond wrote:
> 
>>Takashi Iwai wrote:
>>
>>>At Wed, 29 Jun 2005 20:33:22 +0800,
>>>Raymond wrote:
>>>
>>>
>>>Depends.  The emu10k1 doesn't align to 4k boundary but just
>>>split to different pages since emu10k1 has its own TLB.
>>>
>>

#define get_aligned_page(offset)	((offset) >> PAGE_SHIFT)
#define aligned_page_offset(page)	((page) << PAGE_SHIFT)


The au88x0 driver use Scatter-Gather

How to define set_ptb_entry(vortex,page,addr) for au88x0 ?

> 
> 
> snd_util_mem_*() are helper functions to manage the memory blocks
> _virtually_.  It doesn't allocate any memory block by itself but just
> allocates a metadata for the memory block.  That is, it doesn't matter
> whether the real memory block is stored as SG-buffer or not.  util_mem
> handles only virtually linear buffer.
> 
> 

Do the driver allocated all the memory block when the driver is loaded
or the soundfonts is loaded ? (kcalloc)

What is the purpose of allocating snd_dma_buffer in synth_alloc_pages()  ?

Is the use of set_silent_ptb()  hardware specific ?





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