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Message-ID: <1446002458.1856.25.camel@kernel.crashing.org> Date: Wed, 28 Oct 2015 12:20:58 +0900 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com> Cc: Alexey Kardashevskiy <aik@...abs.ru>, 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 19:30 -0700, Nishanth Aravamudan wrote: > On 28.10.2015 [11:20:05 +0900], Benjamin Herrenschmidt wrote: > > 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. > > Err, duh, sorry! Ok, so in that case, DMA page shift is PAGE_SHIFT, > then? I think so. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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