linux-kernel - Re: [PATCH v6 0/7] PCI: get DMA configuration from parent device

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Message-ID: <54D3E7A7.1030208@ti.com>
Date:	Thu, 5 Feb 2015 16:59:03 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	Murali Karicheri <m-karicheri2@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	<devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: Re: [PATCH v6 0/7] PCI: get DMA configuration from parent device

Hi Arnd & Bjorn,

I believe this is ready to be merged so that it becomes available in 
v3.20. Not sure which subsystem will pick this up. Could you respond?

I am working on another patch to address the size based dma mask 
calculation as suggested in this thread and don't want to delay merge of 
this series because of that for reason I have mentioned below in the 
cover letter. So if this looks good, please merge this to the 
appropriate subsystem.

Thanks a lot for the review and comments.

Murali

On 02/05/2015 04:52 PM, Murali Karicheri wrote:
> This patch add an important capability to PCI driver on Keystone. I hope to
> have this merged to the upstream branch so that it is available for v3.20.
> Also would like thank everyone for the contribution.
>
> PCI devices on Keystone doesn't have correct dma_pfn_offset set. This patch
> add capability to set the dma configuration such as dma-mask, dma_pfn_offset,
> and dma ops etc using the information from DT. The prior RFCs and discussions
> are available at [1] and [2] below.
>
> [2] : https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg790244.html
> [1] : http://www.gossamer-threads.com/lists/linux/kernel/2024591
>
> Change history:
> 	v6 - Rebased to v3.19-v7
> 	   - Addressed some minor comments about node name and DT size validation.
> 	   - Pulled out 8/8 of v5 and plan to send a patch for enhancing
> 	     of_dma_configure() to use size to calculate dma mask.
> 	   - Added Acks from reviewers.
> 	v5 - moved the dma_mask update in device from ARM specific API to
> 	     of_dma_configure to allow this across other architecture as well
> 	   - improved sanity check for DT dma-range size in of_dma_configure()
> 	   - moved API to get parent bridge device to PCI (host-bridge.c)
> 	v4 - moved size adjustments in of_iommu_configure() to a separate patch
> 	   - consistent node name comment from Rob
> 	   - patch 6 added for dma_mask adjustment and iommu mapping size
> 	     limiting.
> 	v3 - addressed comments to re-use of_dma_configure() for PCI
> 	   - To help re-use, change of_iommu_configure() function argument
> 		- Move of_dma_configure to of/device.c
> 		- Limit the of_iommu_configure to non pci devices
> 	v2 - update size to coherent_dma_mask + 1 if dma-range info is missing
> 	   - also check the np for null.
> 	v1 - updates based on the comments against initial RFC.
> 	   - Added a helper function to get the OF node of the parent
> 	   - Added an API in of_pci.c to update DMA configuration of the pci
> 	     device.
>
> Cc: Joerg Roedel<joro@...tes.org>
> Cc: Grant Likely<grant.likely@...aro.org>
> Cc: Rob Herring<robh+dt@...nel.org>
> Cc: Bjorn Helgaas<bhelgaas@...gle.com>
> Cc: Will Deacon<will.deacon@....com>
> Cc: Russell King<linux@....linux.org.uk>
> Cc: Arnd Bergmann<arnd@...db.de>
> Cc: Suravee Suthikulpanit<Suravee.Suthikulpanit@....com>
>
> Acked-by: Bjorn Helgaas<bhelgaas@...gle.com>
> Acked-by: Murali Karicheri<m-karicheri2@...com>
>
> Murali Karicheri (7):
>    of: iommu: add ptr to OF node arg to of_iommu_configure()
>    of: move of_dma_configure() to device.c to help re-use
>    of: fix size when dma-range is not used
>    PCI: add helper functions pci_get[put]_host_bridge_device()
>    of/pci: add of_pci_dma_configure() update dma configuration
>    PCI: update dma configuration from DT
>    arm: dma-mapping: limit iommu mapping size
>
>   arch/arm/mm/dma-mapping.c |    7 +++++
>   drivers/iommu/of_iommu.c  |   10 ++++--
>   drivers/of/device.c       |   74 +++++++++++++++++++++++++++++++++++++++++++++
>   drivers/of/of_pci.c       |   19 ++++++++++++
>   drivers/of/platform.c     |   58 ++---------------------------------
>   drivers/pci/host-bridge.c |   14 +++++++++
>   drivers/pci/probe.c       |    2 ++
>   include/linux/of_device.h |    2 ++
>   include/linux/of_iommu.h  |    6 ++--
>   include/linux/of_pci.h    |    5 +++
>   include/linux/pci.h       |    3 ++
>   11 files changed, 140 insertions(+), 60 deletions(-)
>


-- 
Murali Karicheri
Linux Kernel, Texas Instruments
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