[PATCH v6 0/7] PCI: get DMA configuration from parent device

[Suravee Suthikulpanit]

Sorry for delay response. I have also tested this on AMD Seattle 
platform w/ PCI Generic Host Controller, and I can see that the PCI 
endpoint devices are getting proper dma_map_ops as set in the host bridge.

<Tested-by>: Suravee Suthikulpanit <Suravee.Suthikulpanit at amd.com>

Thanks,
Suravee

On 02/06/2015 05:52 AM, 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 at 8bytes.org>
> Cc: Grant Likely <grant.likely at linaro.org>
> Cc: Rob Herring <robh+dt at kernel.org>
> Cc: Bjorn Helgaas <bhelgaas at google.com>
> Cc: Will Deacon <will.deacon at arm.com>
> Cc: Russell King <linux at arm.linux.org.uk>
> Cc: Arnd Bergmann <arnd at arndb.de>
> Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit at amd.com>
>
> Acked-by: Bjorn Helgaas <bhelgaas at google.com>
> Acked-by: Murali Karicheri <m-karicheri2 at ti.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(-)
>