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 01:48:55 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
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

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.


> +			arch_setup_dma_ops(&dev->dev, 0, 0, NULL, coherent);
>  	}
>  
>  	pci_put_host_bridge_device(bridge);
> 

Thanks,
Rafael

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