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 <[email protected]> Acked-by: Bjorn Helgaas <[email protected]> Reviewed-by: Hanjun Guo <[email protected]> CC: Rafael J. Wysocki <[email protected]> --- drivers/pci/probe.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 31e3eef..40eed54 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -12,6 +12,7 @@ #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" @@ -1638,7 +1639,7 @@ 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) { @@ -1647,6 +1648,15 @@ 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); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
