Commit ab3d5273 authored by Suthikulpanit, Suravee's avatar Suthikulpanit, Suravee Committed by Rafael J. Wysocki
Browse files

device property: ACPI: Remove unused DMA APIs 



These DMA APIs are replaced with the newer versions, which return
the enum dev_dma_attr. So, we can safely remove them.

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 1831eff8

drivers/base/property.c

+0 −13
Original line number Diff line number Diff line
@@ -598,19 +598,6 @@ unsigned int device_get_child_node_count(struct device *dev) 
}

EXPORT_SYMBOL_GPL(device_get_child_node_count);



bool device_dma_is_coherent(struct device *dev)

{

	bool coherent = false;



	if (IS_ENABLED(CONFIG_OF) && dev->of_node)

		coherent = of_dma_is_coherent(dev->of_node);

	else

		acpi_check_dma(ACPI_COMPANION(dev), &coherent);



	return coherent;

}

EXPORT_SYMBOL_GPL(device_dma_is_coherent);



bool device_dma_supported(struct device *dev)

{

	/* For DT, this is always supported.

include/acpi/acpi_bus.h

+0 −34
Original line number Diff line number Diff line
@@ -390,40 +390,6 @@ struct acpi_data_node { 
	struct completion kobj_done;

};



static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)

{

	bool ret = false;



	if (!adev)

		return ret;



	/**

	 * Currently, we only support _CCA=1 (i.e. coherent_dma=1)

	 * This should be equivalent to specifyig dma-coherent for

	 * a device in OF.

	 *

	 * For the case when _CCA=0 (i.e. coherent_dma=0 && cca_seen=1),

	 * There are two cases:

	 * case 1. Do not support and disable DMA.

	 * case 2. Support but rely on arch-specific cache maintenance for

	 *         non-coherence DMA operations.

	 * Currently, we implement case 2 above.

	 *

	 * For the case when _CCA is missing (i.e. cca_seen=0) and

	 * platform specifies ACPI_CCA_REQUIRED, we do not support DMA,

	 * and fallback to arch-specific default handling.

	 *

	 * See acpi_init_coherency() for more info.

	 */

	if (adev->flags.coherent_dma ||

	    (adev->flags.cca_seen && IS_ENABLED(CONFIG_ARM64))) {

		ret = true;

		if (coherent)

			*coherent = adev->flags.coherent_dma;

	}

	return ret;

}



static inline bool is_acpi_node(struct fwnode_handle *fwnode)

{

	return fwnode && (fwnode->type == FWNODE_ACPI

include/linux/acpi.h

+0 −5
Original line number Diff line number Diff line
@@ -574,11 +574,6 @@ static inline int acpi_device_modalias(struct device *dev, 
	return -ENODEV;

}



static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)

{

	return false;

}



static inline bool acpi_dma_supported(struct acpi_device *adev)

{

	return false;

include/linux/property.h

+0 −2
Original line number Diff line number Diff line
@@ -174,8 +174,6 @@ struct property_set { 


void device_add_property_set(struct device *dev, struct property_set *pset);



bool device_dma_is_coherent(struct device *dev);



bool device_dma_supported(struct device *dev);



enum dev_dma_attr device_get_dma_attr(struct device *dev);

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