linux-kernel - Re: [PATCH 4/7] swiotlb: Allow arch override of address_needs

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Date:	Wed, 08 Apr 2009 16:16:17 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	galak@...nel.crashing.org, hch@...radead.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	ian.campbell@...rix.com, beckyb@...nel.crashing.org
Subject: Re: [PATCH 4/7] swiotlb: Allow arch override of address_needs_mapping

FUJITA Tomonori wrote:
>> Becky's patches of last week also added __weak annotations to 
>> swiotlb_bus_to_virt, virt_to_bus and bus_to_phys; added the hwdev 
>> parameter to swiotlb_bus_to_phys; and added a weak 
>> swiotlb_arch_address_needs_mapping.  I assume that was needed because 
>> powerpc needs non-trivial implementations for those functions.
>>     
>
> Hmm, what she added are wrappers of virt_to_bus and bus_to_virt. We
> can remove these and directly use virt_to_bus and bus_to_virt.
>   

In general those interfaces are deprecated.  Are we un-deprecating 
them?  Or do you mean adding virt<->bus to dma_ops?

> About __weak address_needs_mapping function, as I said, removing it
> and using dma_map_ops is a proper solution.
>   

Fine.  Could swiotlb_alloc() just call dma_alloc_coherent() too?

    J
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