linux-kernel - Re: dma_alloc_coherent() on PPC32: physical addresses above 2G possible?

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Message-ID: <20080720123900.02677e6e@infradead.org>
Date:	Sun, 20 Jul 2008 12:39:00 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: dma_alloc_coherent() on PPC32: physical addresses above 2G
 possible?

On Sun, 20 Jul 2008 21:25:51 +0200
Stefan Richter <stefanr@...6.in-berlin.de> wrote:

> 
> Later on:
> 
> 	if (dev->needs_dma_mask_workaround)
> 		pci_set_consistent_dma_mask(pdev, DMA_31BIT_MASK);
> 	allocate_something_special;
> 	if (dev->needs_dma_mask_workaround)
> 		pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
> 
> Or is there a variant of dma_alloc_coherent() which directly accepts a
> mask argument?

something like this.
But realistically, how many consistent/coherent allocations do you have?
some ring buffers and other one time stuff surely... but not after that?

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