linux-kernel - Re: [PATCH 2/7 v2] powerpc/dma-mapping: override dma_get_page

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Message-ID: <1445998805.1856.24.camel@kernel.crashing.org>
Date:	Wed, 28 Oct 2015 11:20:05 +0900
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	Michael Ellerman <mpe@...erman.id.au>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>,
	Paul Mackerras <paulus@...ba.org>,
	David Gibson <david@...son.dropbear.id.au>,
	Christoph Hellwig <hch@...radead.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH 2/7 v2] powerpc/dma-mapping: override dma_get_page_shift

On Tue, 2015-10-27 at 18:54 -0700, Nishanth Aravamudan wrote:
> 
> In "bypass" mode, what TCE size is used? Is it guaranteed to be 4K?

None :-) The TCEs are completely bypassed. You get a N:M linear mapping
of all memory starting at 1<<59 PCI side.

> Seems like this would be a different platform implentation I'd put in
> for 'powernv', is that right?
> 
> My apologies for missing that, and thank you for the review!

Cheers,
Ben.

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