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device property: Adding DMA Attribute APIs for Generic Devices
The function device_dma_is_coherent() does not sufficiently communicate device DMA attributes. Instead, this patch introduces device_get_dma_attr(), which returns enum dev_dma_attr. It replaces the acpi_check_dma(), which will be removed in subsequent patch. This also provides a convenient function, device_dma_supported(), to check DMA support of the specified device. Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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2 changed files with 33 additions and 0 deletions
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@ -611,6 +611,35 @@ bool device_dma_is_coherent(struct device *dev)
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}
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EXPORT_SYMBOL_GPL(device_dma_is_coherent);
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bool device_dma_supported(struct device *dev)
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{
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/* For DT, this is always supported.
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* For ACPI, this depends on CCA, which
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* is determined by the acpi_dma_supported().
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*/
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if (IS_ENABLED(CONFIG_OF) && dev->of_node)
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return true;
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return acpi_dma_supported(ACPI_COMPANION(dev));
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}
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EXPORT_SYMBOL_GPL(device_dma_supported);
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enum dev_dma_attr device_get_dma_attr(struct device *dev)
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{
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enum dev_dma_attr attr = DEV_DMA_NOT_SUPPORTED;
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if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
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if (of_dma_is_coherent(dev->of_node))
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attr = DEV_DMA_COHERENT;
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else
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attr = DEV_DMA_NON_COHERENT;
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} else
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attr = acpi_get_dma_attr(ACPI_COMPANION(dev));
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return attr;
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}
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EXPORT_SYMBOL_GPL(device_get_dma_attr);
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/**
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* device_get_phy_mode - Get phy mode for given device
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* @dev: Pointer to the given device
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@ -176,6 +176,10 @@ void device_add_property_set(struct device *dev, struct property_set *pset);
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bool device_dma_is_coherent(struct device *dev);
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bool device_dma_supported(struct device *dev);
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enum dev_dma_attr device_get_dma_attr(struct device *dev);
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int device_get_phy_mode(struct device *dev);
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void *device_get_mac_address(struct device *dev, char *addr, int alen);
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