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
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(-)
--
2.1.0
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