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Commit 29dbe1f0 authored by Suthikulpanit, Suravee's avatar Suthikulpanit, Suravee Committed by Rafael J. Wysocki
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PCI: ACPI: Add support for PCI device DMA coherency 



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: default avatarSuravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 50230713

drivers/pci/probe.c

+11 −1
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/module.h>

#include <linux/cpumask.h>

#include <linux/pci-aspm.h>

#include <linux/acpi.h>

#include <asm-generic/pci-bridge.h>

#include "pci.h"
@@ -1639,7 +1640,7 @@ static void pci_set_msi_domain(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)

{
@@ -1648,6 +1649,15 @@ static void pci_dma_configure(struct pci_dev *dev) 
	if (IS_ENABLED(CONFIG_OF) && dev->dev.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_device_node(bridge->fwnode);

		enum dev_dma_attr attr = acpi_get_dma_attr(adev);



		if (attr == DEV_DMA_NOT_SUPPORTED)

			dev_warn(&dev->dev, "DMA not supported.\n");

		else

			arch_setup_dma_ops(&dev->dev, 0, 0, NULL,

					   attr == DEV_DMA_COHERENT);

	}



	pci_put_host_bridge_device(bridge);