From: nacc@linux.vnet.ibm.com (Nishanth Aravamudan)
Subject: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API
Date: Wed, 14 Oct 2015 08:39:00 -0700 [thread overview]
Message-ID: <20151014153900.GC30179@linux.vnet.ibm.com> (raw)
In-Reply-To: <20151012210651.GB26702@linux.vnet.ibm.com>
Hi Christoph,
On 12.10.2015 [14:06:51 -0700], Nishanth Aravamudan wrote:
> On 06.10.2015 [02:51:36 -0700], Christoph Hellwig wrote:
> > Do we need a function here or can we just have a IOMMU_PAGE_SHIFT define
> > with an #ifndef in common code?
>
> On Power, since it's technically variable, we'd need a function. So are
> you suggesting define'ing it to a function just on Power and leaving it
> a constant elsewhere?
>
> I noticed that sparc has a IOMMU_PAGE_SHIFT already, fwiw.
Sorry, I should have been more specific -- I'm ready to spin out a v3,
with a sparc-specific function.
Are you ok with leaving it a function for now (the only caller is in
NVMe obviously).
-Nish
WARNING: multiple messages have this Message-ID (diff)
From: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Matthew Wilcox <willy@linux.intel.com>,
Keith Busch <keith.busch@intel.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
David Gibson <david@gibson.dropbear.id.au>,
linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API
Date: Wed, 14 Oct 2015 08:39:00 -0700 [thread overview]
Message-ID: <20151014153900.GC30179@linux.vnet.ibm.com> (raw)
In-Reply-To: <20151012210651.GB26702@linux.vnet.ibm.com>
Hi Christoph,
On 12.10.2015 [14:06:51 -0700], Nishanth Aravamudan wrote:
> On 06.10.2015 [02:51:36 -0700], Christoph Hellwig wrote:
> > Do we need a function here or can we just have a IOMMU_PAGE_SHIFT define
> > with an #ifndef in common code?
>
> On Power, since it's technically variable, we'd need a function. So are
> you suggesting define'ing it to a function just on Power and leaving it
> a constant elsewhere?
>
> I noticed that sparc has a IOMMU_PAGE_SHIFT already, fwiw.
Sorry, I should have been more specific -- I'm ready to spin out a v3,
with a sparc-specific function.
Are you ok with leaving it a function for now (the only caller is in
NVMe obviously).
-Nish
next prev parent reply other threads:[~2015-10-14 15:39 UTC|newest]
Thread overview: 84+ 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 17:16 ` Nishanth Aravamudan
2015-10-02 17:18 ` [PATCH 1/2] powerpc/iommu: expose IOMMU page shift Nishanth Aravamudan
2015-10-02 17:18 ` 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 17:23 ` Nishanth Aravamudan
2015-10-02 17:25 ` Christoph Hellwig
2015-10-02 17:25 ` Christoph Hellwig
2015-10-02 17:39 ` Nishanth Aravamudan
2015-10-02 17:39 ` Nishanth Aravamudan
2015-10-02 17:41 ` Christoph Hellwig
2015-10-02 17:41 ` Christoph Hellwig
2015-10-02 18:57 ` kbuild test robot
2015-10-02 18:57 ` kbuild test robot
2015-10-06 3:19 ` [PATCH 1/2] powerpc/iommu: expose IOMMU page shift David Gibson
2015-10-06 3:19 ` David Gibson
2015-10-12 16:03 ` Nishanth Aravamudan
2015-10-12 16:03 ` Nishanth Aravamudan
2015-10-12 21:10 ` 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 20:09 ` 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 20:11 ` Nishanth Aravamudan
2015-10-02 20:16 ` [PATCH 2/5 v2] powerpc/dma-mapping: override dma_get_page_shift Nishanth Aravamudan
2015-10-02 20:16 ` 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 20:19 ` 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 20:21 ` Nishanth Aravamudan
2015-10-02 20:30 ` [PATCH 5/5 v2] drivers/nvme: default to the IOMMU page size Nishanth Aravamudan
2015-10-02 20:30 ` Nishanth Aravamudan
2015-10-02 20:43 ` kbuild test robot
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
2015-10-02 20:33 ` kbuild test robot
2015-10-06 3:39 ` Michael Ellerman
2015-10-06 3:39 ` Michael Ellerman
2015-10-07 13:56 ` [kbuild-all] " Fengguang Wu
2015-10-07 13:56 ` Fengguang Wu
2015-10-08 0:11 ` Michael Ellerman
2015-10-08 0:11 ` Michael Ellerman
2015-10-08 1:06 ` Fengguang Wu
2015-10-08 1:06 ` Fengguang Wu
2015-10-08 1:16 ` Fengguang Wu
2015-10-08 1:16 ` Fengguang Wu
2015-10-08 4:06 ` Michael Ellerman
2015-10-08 4:06 ` Michael Ellerman
2015-10-11 14:22 ` Fengguang Wu
2015-10-11 14:22 ` Fengguang Wu
2015-10-12 2:51 ` Michael Ellerman
2015-10-12 2:51 ` Michael Ellerman
2015-10-08 7:46 ` Christoph Hellwig
2015-10-08 7:46 ` Christoph Hellwig
2015-10-11 14:19 ` testing email patches Fengguang Wu
2015-10-11 14:19 ` 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 3:43 ` Michael Ellerman
2015-10-06 9:51 ` Christoph Hellwig
2015-10-06 9:51 ` Christoph Hellwig
2015-10-12 16:04 ` Nishanth Aravamudan
2015-10-12 16:04 ` Nishanth Aravamudan
2015-10-12 21:06 ` Nishanth Aravamudan
2015-10-12 21:06 ` Nishanth Aravamudan
2015-10-14 15:39 ` Nishanth Aravamudan [this message]
2015-10-14 15:39 ` Nishanth Aravamudan
2015-10-14 15:42 ` Christoph Hellwig
2015-10-14 15:42 ` Christoph Hellwig
2015-10-15 22:52 ` Nishanth Aravamudan
2015-10-15 22:52 ` Nishanth Aravamudan
2015-10-15 22:52 ` Nishanth Aravamudan
2015-10-19 17:56 ` Nishanth Aravamudan
2015-10-19 17:56 ` 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 20:51 ` Benjamin Herrenschmidt
2015-10-02 21:04 ` Nishanth Aravamudan
2015-10-02 21:04 ` Nishanth Aravamudan
2015-10-02 21:35 ` Benjamin Herrenschmidt
2015-10-02 21:35 ` Benjamin Herrenschmidt
2015-10-02 21:48 ` Nishanth Aravamudan
2015-10-02 21:48 ` Nishanth Aravamudan
2015-10-03 8:19 ` Christoph Hellwig
2015-10-03 8:19 ` Christoph Hellwig
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