From: benh@kernel.crashing.org (Benjamin Herrenschmidt)
Subject: [PATCH 2/7 v2] powerpc/dma-mapping: override dma_get_page_shift
Date: Wed, 28 Oct 2015 12:20:58 +0900 [thread overview]
Message-ID: <1446002458.1856.25.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151028023028.GI7716@linux.vnet.ibm.com>
On Tue, 2015-10-27@19:30 -0700, Nishanth Aravamudan wrote:
> On 28.10.2015 [11:20:05 +0900], Benjamin Herrenschmidt wrote:
> > On Tue, 2015-10-27@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.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Michael Ellerman <mpe@ellerman.id.au>,
Matthew Wilcox <willy@linux.intel.com>,
Keith Busch <keith.busch@intel.com>,
Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>,
Christoph Hellwig <hch@infradead.org>,
"David S. Miller" <davem@davemloft.net>,
linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org
Subject: Re: [PATCH 2/7 v2] powerpc/dma-mapping: override dma_get_page_shift
Date: Wed, 28 Oct 2015 12:20:58 +0900 [thread overview]
Message-ID: <1446002458.1856.25.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151028023028.GI7716@linux.vnet.ibm.com>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: sparclinux@vger.kernel.org
Subject: Re: [PATCH 2/7 v2] powerpc/dma-mapping: override dma_get_page_shift
Date: Wed, 28 Oct 2015 03:20:58 +0000 [thread overview]
Message-ID: <1446002458.1856.25.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151028023028.GI7716@linux.vnet.ibm.com>
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.
next prev parent reply other threads:[~2015-10-28 3:20 UTC|newest]
Thread overview: 147+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-23 20:54 [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA Nishanth Aravamudan
2015-10-23 20:54 ` Nishanth Aravamudan
2015-10-23 20:54 ` Nishanth Aravamudan
2015-10-23 20:56 ` [PATCH 1/7 v3] dma-mapping: add generic dma_get_page_shift API Nishanth Aravamudan
2015-10-23 20:56 ` Nishanth Aravamudan
2015-10-23 20:56 ` Nishanth Aravamudan
2015-10-23 20:57 ` [PATCH 2/7 v2] powerpc/dma-mapping: override dma_get_page_shift Nishanth Aravamudan
2015-10-23 20:57 ` Nishanth Aravamudan
2015-10-23 20:57 ` Nishanth Aravamudan
2015-10-27 6:02 ` Alexey Kardashevskiy
2015-10-27 6:02 ` Alexey Kardashevskiy
2015-10-27 6:02 ` Alexey Kardashevskiy
2015-10-27 14:06 ` Busch, Keith
2015-10-27 14:06 ` Busch, Keith
2015-10-27 14:06 ` Busch, Keith
2015-10-27 22:27 ` Nishanth Aravamudan
2015-10-27 22:27 ` Nishanth Aravamudan
2015-10-27 22:27 ` Nishanth Aravamudan
2015-10-28 1:00 ` Alexey Kardashevskiy
2015-10-28 1:00 ` Alexey Kardashevskiy
2015-10-28 1:00 ` Alexey Kardashevskiy
2015-10-28 1:54 ` Nishanth Aravamudan
2015-10-28 1:54 ` Nishanth Aravamudan
2015-10-28 1:54 ` Nishanth Aravamudan
2015-10-28 2:20 ` Benjamin Herrenschmidt
2015-10-28 2:20 ` Benjamin Herrenschmidt
2015-10-28 2:20 ` Benjamin Herrenschmidt
2015-10-28 2:30 ` Nishanth Aravamudan
2015-10-28 2:30 ` Nishanth Aravamudan
2015-10-28 2:30 ` Nishanth Aravamudan
2015-10-28 3:20 ` Benjamin Herrenschmidt [this message]
2015-10-28 3:20 ` Benjamin Herrenschmidt
2015-10-28 3:20 ` Benjamin Herrenschmidt
2015-10-23 20:57 ` [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA Nishanth Aravamudan
2015-10-23 20:57 ` Nishanth Aravamudan
2015-10-23 20:57 ` Nishanth Aravamudan
2015-10-23 20:58 ` [PATCH 3/7 v2] powerpc/dma: implement per-platform dma_get_page_shift Nishanth Aravamudan
2015-10-23 20:58 ` Nishanth Aravamudan
2015-10-23 20:58 ` Nishanth Aravamudan
2015-10-23 20:59 ` [PATCH 4/7 v2] pseries/iommu: implement DDW-aware dma_get_page_shift Nishanth Aravamudan
2015-10-23 20:59 ` Nishanth Aravamudan
2015-10-23 20:59 ` Nishanth Aravamudan
2015-10-27 5:56 ` Alexey Kardashevskiy
2015-10-27 5:56 ` Alexey Kardashevskiy
2015-10-27 5:56 ` Alexey Kardashevskiy
2015-10-27 22:22 ` Nishanth Aravamudan
2015-10-27 22:22 ` Nishanth Aravamudan
2015-10-27 22:22 ` Nishanth Aravamudan
2015-10-23 21:00 ` [PATCH 5/7] [RFC PATCH 5/7] sparc: rename kernel/iommu_common.h -> include/asm/iommu_common.h Nishanth Aravamudan
2015-10-23 21:00 ` Nishanth Aravamudan
2015-10-23 21:00 ` Nishanth Aravamudan
2015-10-23 21:02 ` Nishanth Aravamudan
2015-10-23 21:02 ` Nishanth Aravamudan
2015-10-23 21:02 ` Nishanth Aravamudan
2015-10-23 21:01 ` [RFC PATCH 6/7] sparc/dma-mapping: override dma_get_page_shift Nishanth Aravamudan
2015-10-23 21:01 ` Nishanth Aravamudan
2015-10-23 21:01 ` Nishanth Aravamudan
2015-10-23 21:02 ` [PATCH 7/7 v2] drivers/nvme: default to the IOMMU page size Nishanth Aravamudan
2015-10-23 21:02 ` Nishanth Aravamudan
2015-10-23 21:02 ` Nishanth Aravamudan
2015-10-27 1:27 ` [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA David Miller
2015-10-27 1:27 ` David Miller
2015-10-27 1:27 ` David Miller
2015-10-27 22:20 ` Nishanth Aravamudan
2015-10-27 22:20 ` Nishanth Aravamudan
2015-10-27 22:20 ` Nishanth Aravamudan
2015-10-27 22:36 ` Busch, Keith
2015-10-27 22:36 ` Busch, Keith
2015-10-27 22:36 ` Busch, Keith
2015-10-28 0:54 ` David Miller
2015-10-28 0:54 ` David Miller
2015-10-28 0:54 ` David Miller
2015-10-28 13:59 ` Busch, Keith
2015-10-28 13:59 ` Busch, Keith
2015-10-28 13:59 ` Busch, Keith
2015-10-29 11:55 ` Christoph Hellwig
2015-10-29 11:55 ` Christoph Hellwig
2015-10-29 11:55 ` Christoph Hellwig
2015-10-29 15:57 ` Nishanth Aravamudan
2015-10-29 15:57 ` Nishanth Aravamudan
2015-10-29 15:57 ` Nishanth Aravamudan
2015-10-29 17:20 ` Busch, Keith
2015-10-29 17:20 ` Busch, Keith
2015-10-29 17:20 ` Busch, Keith
2015-10-30 21:35 ` [PATCH 1/1 v3] drivers/nvme: default to 4k device page size Nishanth Aravamudan
2015-10-30 21:35 ` Nishanth Aravamudan
2015-10-30 21:35 ` Nishanth Aravamudan
2015-10-30 21:48 ` Keith Busch
2015-10-30 21:48 ` Keith Busch
2015-10-30 21:48 ` Keith Busch
2015-10-30 22:13 ` Nishanth Aravamudan
2015-10-30 22:13 ` Nishanth Aravamudan
2015-10-30 22:13 ` Nishanth Aravamudan
2015-11-03 13:18 ` Christoph Hellwig
2015-11-03 13:18 ` Christoph Hellwig
2015-11-03 13:18 ` Christoph Hellwig
2015-11-03 13:46 ` Keith Busch
2015-11-03 13:46 ` Keith Busch
2015-11-03 13:46 ` Keith Busch
2015-11-05 17:01 ` [PATCH 1/1 v4] " Nishanth Aravamudan
2015-11-05 17:01 ` Nishanth Aravamudan
2015-11-05 17:01 ` Nishanth Aravamudan
2015-11-05 19:58 ` Christoph Hellwig
2015-11-05 19:58 ` Christoph Hellwig
2015-11-05 19:58 ` Christoph Hellwig
2015-11-05 21:54 ` Nishanth Aravamudan
2015-11-05 21:54 ` Nishanth Aravamudan
2015-11-05 21:54 ` Nishanth Aravamudan
2015-11-06 16:13 ` Nishanth Aravamudan
2015-11-06 16:13 ` Nishanth Aravamudan
2015-11-06 16:13 ` Nishanth Aravamudan
2015-11-13 7:37 ` Christoph Hellwig
2015-11-13 7:37 ` Christoph Hellwig
2015-11-13 7:37 ` Christoph Hellwig
2015-11-13 15:08 ` Keith Busch
2015-11-13 15:08 ` Keith Busch
2015-11-13 15:08 ` Keith Busch
2015-11-18 14:42 ` Christoph Hellwig
2015-11-18 14:42 ` Christoph Hellwig
2015-11-18 14:42 ` Christoph Hellwig
2015-10-30 1:49 ` [PATCH 0/5 v3] Fix NVMe driver support on Power with 32-bit DMA David Miller
2015-10-30 1:49 ` David Miller
2015-10-30 1:49 ` David Miller
2015-10-30 21:35 ` Nishanth Aravamudan
2015-10-30 21:35 ` Nishanth Aravamudan
2015-10-30 21:35 ` Nishanth Aravamudan
2015-10-27 22:57 ` Julian Calaby
2015-10-27 22:57 ` Julian Calaby
2015-10-27 22:57 ` Julian Calaby
2015-10-27 23:40 ` Nishanth Aravamudan
2015-10-27 23:40 ` Nishanth Aravamudan
2015-10-27 23:40 ` Nishanth Aravamudan
2015-10-27 23:43 ` Julian Calaby
2015-10-27 23:43 ` Julian Calaby
2015-10-27 23:43 ` Julian Calaby
2015-10-28 0:29 ` Benjamin Herrenschmidt
2015-10-28 0:29 ` Benjamin Herrenschmidt
2015-10-28 0:29 ` Benjamin Herrenschmidt
2015-10-28 0:43 ` David Miller
2015-10-28 1:00 ` David Miller
2015-10-28 1:00 ` David Miller
2015-10-28 0:53 ` David Miller
2015-10-28 0:53 ` David Miller
2015-10-28 0:53 ` David Miller
2015-10-28 1:52 ` Nishanth Aravamudan
2015-10-28 1:52 ` Nishanth Aravamudan
2015-10-28 1:52 ` Nishanth Aravamudan
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