linux-kernel - Re: [PATCH V2 4/4] PCI: ACPI: Add support for PCI device DMA coherency

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Date:	Wed, 26 Aug 2015 09:01:58 +0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	<bhelgaas@...gle.com>, <lenb@...nel.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<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>,
	Rob Herring <robh+dt@...nel.org>,
	Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH V2 4/4] PCI: ACPI: Add support for PCI device DMA
 coherency

Hi Rafael,

On 8/26/15 06:48, Rafael J. Wysocki wrote:
> On Wednesday, August 26, 2015 12:33:29 AM Suravee Suthikulpanit wrote:
>> This patch adds support for setting up PCI device DMA coherency from
>> ACPI _CCA object that should normally be specified in the DSDT node
>> of its PCI host bridge.
>>
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> CC: Bjorn Helgaas <bhelgaas@...gle.com>
>> CC: Catalin Marinas <catalin.marinas@....com>
>> CC: Rob Herring <robh+dt@...nel.org>
>> CC: Will Deacon <will.deacon@....com>
>> CC: Rafael J. Wysocki <rjw@...ysocki.net>
>> CC: Murali Karicheri <m-karicheri2@...com>
>> ---
>>   drivers/pci/probe.c | 15 ++++++++++-----
>>   1 file changed, 10 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index 4de6594..2fd2a60 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -1551,17 +1551,22 @@ static void pci_init_capabilities(struct pci_dev *dev)
>>    * @dev: ptr to pci_dev struct of the PCI device
>>    *
>>    * Function to update PCI devices's DMA configuration using the same
>> - * info from the OF node of host bridge's parent (if any).
>> + * info from the OF node or ACPI node of host bridge's parent (if any).
>>    */
>>   static void pci_dma_configure(struct pci_dev *dev)
>>   {
>>   	struct device *bridge = pci_get_host_bridge_device(dev);
>>
>>   	if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) {
>> -		if (!bridge->parent)
>> -			return;
>> -
>> -		of_dma_configure(&dev->dev, bridge->parent->of_node);
>> +		if (bridge->parent)
>> +			of_dma_configure(&dev->dev,
>> +					 bridge->parent->of_node);
>> +	} else if (has_acpi_companion(bridge)) {
>> +		struct acpi_device *adev = to_acpi_node(bridge->fwnode);
>> +		int coherent = acpi_check_dma_coherency(adev);
>> +
>> +		if (-1 != coherent)
>
> The ordering of this check is somewhat unusual.

I'll fix this.

Thanks,
Suravee
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