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Message-ID: <1432159758-4486-4-git-send-email-Suravee.Suthikulpanit@amd.com>
Date: Wed, 20 May 2015 17:09:16 -0500
From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To: <rjw@...ysocki.net>, <lenb@...nel.org>, <catalin.marinas@....com>,
<will.deacon@....com>, <thomas.lendacky@....com>,
<herbert@...dor.apana.org.au>, <davem@...emloft.net>,
<arnd@...db.de>
CC: <msalter@...hat.com>, <hanjun.guo@...aro.org>,
<al.stone@...aro.org>, <grant.likely@...aro.org>,
<leo.duran@....com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linaro-acpi@...ts.linaro.org>, <netdev@...r.kernel.org>,
<linux-crypto@...r.kernel.org>,
"Suravee Suthikulpanit" <Suravee.Suthikulpanit@....com>
Subject: [V5 PATCH 3/5] device property: Introduces device_dma_is_coherent()
Currently, device drivers, which support both OF and ACPI,
need to call two separate APIs, of_dma_is_coherent() and
acpi_dma_is_coherent()) to determine device coherency attribute.
This patch simplifies this process by introducing a new device
property API, device_dma_is_coherent(), which calls the appropriate
interface based on the booting architecture.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
---
drivers/base/property.c | 14 ++++++++++++++
include/linux/property.h | 2 ++
2 files changed, 16 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 1d0b116..e645852 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -14,6 +14,7 @@
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/property.h>
/**
@@ -519,3 +520,16 @@ unsigned int device_get_child_node_count(struct device *dev)
return count;
}
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);
diff --git a/include/linux/property.h b/include/linux/property.h
index de8bdf4..76ebde9 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -164,4 +164,6 @@ struct property_set {
void device_add_property_set(struct device *dev, struct property_set *pset);
+bool device_dma_is_coherent(struct device *dev);
+
#endif /* _LINUX_PROPERTY_H_ */
--
2.1.0
--
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