linux-kernel - Re: [PATCH V3 0/4] PCI: ACPI: Setting up DMA coherency for PCI device from

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Date:	Wed, 9 Sep 2015 19:16:49 +0700
From:	"Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To:	<bhelgaas@...gle.com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
	<catalin.marinas@....com>, <will.deacon@....com>
CC:	<hanjun.guo@...aro.org>, <linux-acpi@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V3 0/4] PCI: ACPI: Setting up DMA coherency for PCI device
 from _CCA attribute

Hi All,

Are there any other concerns about this patch series?

Thanks,
Suravee

On 8/26/2015 8:54 PM, Suravee Suthikulpanit wrote:
> This patch 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.
>
> I have included the following patch from Jeremy before cleaning up
> the acpi_check_dma() function (in patch 2).
>
>      http://www.spinics.net/lists/linux-usb/msg128582.html)
>
> 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 (3):
>    ACPI/scan: Clean up acpi_check_dma
>    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          |  6 +++---
>   drivers/acpi/scan.c          | 39 +++++++++++++++++++++++++++++++++++++++
>   drivers/base/property.c      | 10 +++++++---
>   drivers/of/of_pci.c          | 20 --------------------
>   drivers/pci/probe.c          | 35 +++++++++++++++++++++++++++++++++--
>   include/acpi/acpi_bus.h      | 35 ++---------------------------------
>   include/linux/acpi.h         |  4 ++--
>   include/linux/of_pci.h       |  3 ---
>   9 files changed, 92 insertions(+), 67 deletions(-)
>
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