linux-kernel - Re: [PATCH V4 0/8] PCI: ACPI: Setting up DMA coherency for PCI device from

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Message-ID: <56310434.7070405@amd.com>
Date:	Wed, 28 Oct 2015 12:21:56 -0500
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Hanjun Guo <hanjun.guo@...aro.org>
CC:	Bjorn Helgaas <helgaas@...nel.org>, <bhelgaas@...gle.com>,
	<lenb@...nel.org>, <catalin.marinas@....com>,
	<will.deacon@....com>, <thomas.lendacky@....com>,
	<herbert@...dor.apana.org.au>, <davem@...emloft.net>,
	<linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V4 0/8] PCI: ACPI: Setting up DMA coherency for PCI device
 from _CCA attribute

Thanks all for the review comments. I'll update the V5 and send it out 
later on today.

Suravee

On 10/28/15 11:00, Rafael J. Wysocki wrote:
> On Wednesday, October 28, 2015 09:54:23 PM Hanjun Guo wrote:
>> Hi Rafael,
>>
>> On 10/27/2015 11:27 PM, Rafael J. Wysocki wrote:
>>> On Tuesday, October 27, 2015 09:52:50 AM Bjorn Helgaas wrote:
>>>> Hi Suravee,
>>>>
>>>> On Wed, Oct 21, 2015 at 08:52:03AM -0700, 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
>>>>>
>>>>>    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(-)
>>>>
>>>> I had a couple minor comments.  It's sort of a toss-up, but this feels
>>>> more ACPI-flavored than PCI, so I assume Rafael will take this whole
>>>> series unless I hear otherwise.
>>>
>>> I'll do that.
>>
>> If Suravee address the comments and send another version,
>> an it be merged into 4.4?
>
> Well, it is likely, but not guaranteed.
>
> We're only a few days from the beginning of the merge window and I'm still
> in Seoul.
>
> Thanks,
> Rafael
>
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