[PATCH V4 0/8] PCI: ACPI: Setting up DMA coherency for PCI device from _CCA attribute

Suravee Suthikulpanit Suravee.Suthikulpanit at amd.com
Wed Oct 21 08:52:03 PDT 2015

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:

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

 drivers/acpi/acpi_platform.c              |  7 +++++-
 drivers/acpi/glue.c                       |  8 +++---
 drivers/acpi/scan.c                       | 42 +++++++++++++++++++++++++++++++
 drivers/base/property.c                   | 32 +++++++++++++++++------
 drivers/crypto/ccp/ccp-platform.c         |  9 ++++++-
 drivers/net/ethernet/amd/xgbe/xgbe-main.c |  9 ++++++-
 drivers/of/of_pci.c                       | 20 ---------------
 drivers/pci/probe.c                       | 36 ++++++++++++++++++++++++--
 include/acpi/acpi_bus.h                   | 36 +++-----------------------
 include/linux/acpi.h                      |  7 +++++-
 include/linux/of_pci.h                    |  3 ---
 include/linux/property.h                  | 10 +++++++-
 12 files changed, 145 insertions(+), 74 deletions(-)


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