From: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Matthew Wilcox <willy@linux.intel.com>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
Keith Busch <keith.busch@intel.com>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
linuxppc-dev@lists.ozlabs.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH 2/2] drivers/nvme: default to the IOMMU page size on Power
Date: Fri, 2 Oct 2015 10:39:47 -0700 [thread overview]
Message-ID: <20151002173947.GA40695@linux.vnet.ibm.com> (raw)
In-Reply-To: <20151002172544.GA16139@infradead.org>
On 02.10.2015 [10:25:44 -0700], Christoph Hellwig wrote:
> Hi Nishanth,
>
> please expose this value through the generic DMA API instead of adding
> architecture specific hacks to drivers.
Ok, I'm happy to do that instead -- what I struggled with is that I
don't have enough knowledge of the various architectures to provide the
right default implementation. It should be sufficient for the default to
return PAGE_SHIFT, and on Power just override that to return the IOMMU
table's page size? Since the only user will be the NVMe driver
currently, that should be fine?
Sorry for the less-than-ideal patch!
-Nish
next prev parent reply other threads:[~2015-10-02 17:39 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-02 17:16 [PATCH 0/2] Fix NVMe driver support on Power with 32-bit DMA Nishanth Aravamudan
2015-10-02 17:18 ` [PATCH 1/2] powerpc/iommu: expose IOMMU page shift Nishanth Aravamudan
2015-10-02 17:23 ` [PATCH 2/2] drivers/nvme: default to the IOMMU page size on Power Nishanth Aravamudan
2015-10-02 17:25 ` Christoph Hellwig
2015-10-02 17:39 ` Nishanth Aravamudan [this message]
2015-10-02 17:41 ` Christoph Hellwig
2015-10-02 18:57 ` kbuild test robot
2015-10-06 3:19 ` [PATCH 1/2] powerpc/iommu: expose IOMMU page shift David Gibson
2015-10-12 16:03 ` Nishanth Aravamudan
2015-10-12 21:10 ` Nishanth Aravamudan
2015-10-02 20:09 ` [PATCH 0/5 v2] Fix NVMe driver support on Power with 32-bit DMA Nishanth Aravamudan
2015-10-02 20:11 ` [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API Nishanth Aravamudan
2015-10-02 20:16 ` [PATCH 2/5 v2] powerpc/dma-mapping: override dma_get_page_shift Nishanth Aravamudan
2015-10-02 20:19 ` [PATCH 3/5 v2] powerpc/dma: implement per-platform dma_get_page_shift Nishanth Aravamudan
2015-10-02 20:21 ` [PATCH 4/5 v2] pseries/iommu: implement DDW-aware dma_get_page_shift Nishanth Aravamudan
2015-10-02 20:30 ` [PATCH 5/5 v2] drivers/nvme: default to the IOMMU page size Nishanth Aravamudan
2015-10-02 20:43 ` kbuild test robot
2015-10-02 20:33 ` [PATCH 4/5 v2] pseries/iommu: implement DDW-aware dma_get_page_shift kbuild test robot
2015-10-06 3:39 ` Michael Ellerman
2015-10-07 13:56 ` [kbuild-all] " Fengguang Wu
2015-10-08 0:11 ` Michael Ellerman
2015-10-08 1:06 ` Fengguang Wu
2015-10-08 1:16 ` Fengguang Wu
2015-10-08 4:06 ` Michael Ellerman
2015-10-11 14:22 ` Fengguang Wu
2015-10-12 2:51 ` Michael Ellerman
2015-10-08 7:46 ` Christoph Hellwig
2015-10-11 14:19 ` testing email patches Fengguang Wu
2015-10-06 3:43 ` [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API Michael Ellerman
2015-10-06 9:51 ` Christoph Hellwig
2015-10-12 16:04 ` Nishanth Aravamudan
2015-10-12 21:06 ` Nishanth Aravamudan
2015-10-14 15:39 ` Nishanth Aravamudan
2015-10-14 15:42 ` Christoph Hellwig
2015-10-15 22:52 ` Nishanth Aravamudan
2015-10-19 17:56 ` Nishanth Aravamudan
2015-10-02 20:51 ` [PATCH 0/5 v2] Fix NVMe driver support on Power with 32-bit DMA Benjamin Herrenschmidt
2015-10-02 21:04 ` Nishanth Aravamudan
2015-10-02 21:35 ` Benjamin Herrenschmidt
2015-10-02 21:48 ` Nishanth Aravamudan
2015-10-03 8:19 ` Christoph Hellwig
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