Commit 29dbe1f0 authored by Suthikulpanit, Suravee's avatar Suthikulpanit, Suravee Committed by Rafael J. Wysocki

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
...@@ -13,6 +13,7 @@ ...@@ -13,6 +13,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/cpumask.h> #include <linux/cpumask.h>
#include <linux/pci-aspm.h> #include <linux/pci-aspm.h>
#include <linux/acpi.h>
#include <asm-generic/pci-bridge.h> #include <asm-generic/pci-bridge.h>
#include "pci.h" #include "pci.h"
...@@ -1639,7 +1640,7 @@ static void pci_set_msi_domain(struct pci_dev *dev) ...@@ -1639,7 +1640,7 @@ static void pci_set_msi_domain(struct pci_dev *dev)
* @dev: ptr to pci_dev struct of the PCI device * @dev: ptr to pci_dev struct of the PCI device
* *
* Function to update PCI devices's DMA configuration using the same * 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) static void pci_dma_configure(struct pci_dev *dev)
{ {
...@@ -1648,6 +1649,15 @@ 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 (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) {
if (bridge->parent) if (bridge->parent)
of_dma_configure(&dev->dev, bridge->parent->of_node); 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); pci_put_host_bridge_device(bridge);
......
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