On 2015/10/21 23:52, Suravee Suthikulpanit wrote:

This patch series adds support to setup DMA coherency for PCI device using
the ACPI _CCA attribute. According to the ACPI spec, the _CCA attribute
is required for ARM64. Therefore, this patch is a pre-req for ACPI PCI
support for ARM64 which is currently in development.  Also, this should
not affect other architectures that does not define 
CONFIG_ACPI_CCA_REQUIRED, since the default value is coherent.

In the process, this series also introduces enum dev_dma_attr and a set
of APIs to query device DMA attribute. These APIs replace the obsolete
device_dma_is_coherent(), and acpi_check_dma().

I have also included a patch from Jeremy posted here:
    http://www.spinics.net/lists/linux-usb/msg128582.html

This patch series  has been tested on AMD Seattle RevB platform.
The git tree containing tested code and pre-req patches are posted here:

    http://github.com/ssuthiku/linux.git pci-cca-v4

Changes from V3: (https://lkml.org/lkml/2015/8/26/389)
    * Clean up suggested by Bjorn
    * Introduce enum dev_dma_attr
    * Replace device_dma_is_coherent() and acpi_check_dma() with
      new APIs.

Changes from V2: (https://lkml.org/lkml/2015/8/25/549)
    * Return -ENOSUPP instead of -1 (per Rafael's suggestion)
    * Add WARN() when fail to setup DMA for PCI device when booting
      ACPI (per Arnd's suggestion)
    * Added Acked-by from Rob.
    * Minor clean up

Changes from V1: (https://lkml.org/lkml/2015/8/13/182)
    * Include patch 1 from Jeremy to enable support for _CCA=0
    * Clean up acpi_check_dma() per Bjorn suggestions
    * Split the original V1 patch into two patches (patch 3 and 4)

Jeremy Linton (1):
  Honor ACPI _CCA attribute setting

Suravee Suthikulpanit (7):
  device property: Introducing enum dev_dma_attr
  acpi: Adding DMA Attribute APIs for ACPI Device
  device property: Adding DMA Attribute APIs for Generic Devices
  device property: acpi: Make use of the new DMA Attribute APIs
  device property: acpi: Remove unused DMA APIs
  PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
  PCI: ACPI: Add support for PCI device DMA coherency

If the minor comments for patch 7,8 are addressed,

Reviewed-by: Hanjun Guo <redacted>

Thanks
Hanjun