linux-kernel - [PATCH v5 2/4] lib: devres: add a helper function for ioremap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20191016210629.1005086-3-ztuowen@gmail.com>
Date:   Wed, 16 Oct 2019 15:06:28 -0600
From:   Tuowen Zhao <ztuowen@...il.com>
To:     lee.jones@...aro.org, linux-kernel@...r.kernel.org
Cc:     andriy.shevchenko@...ux.intel.com, mika.westerberg@...ux.intel.com,
        acelan.kao@...onical.com, mcgrof@...nel.org, davem@...emloft.net,
        Tuowen Zhao <ztuowen@...il.com>
Subject: [PATCH v5 2/4] lib: devres: add a helper function for ioremap_uc

Implement a resource managed strongly uncachable ioremap function.

Cc: <stable@...r.kernel.org>
Tested-by: AceLan Kao <acelan.kao@...onical.com>
Signed-off-by: Tuowen Zhao <ztuowen@...il.com>
Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Luis Chamberlain <mcgrof@...nel.org>
Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
---
 include/linux/io.h |  2 ++
 lib/devres.c       | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/linux/io.h b/include/linux/io.h
index accac822336a..a59834bc0a11 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -64,6 +64,8 @@ static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 
 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 			   resource_size_t size);
+void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
+				   resource_size_t size);
 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 				   resource_size_t size);
 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
diff --git a/lib/devres.c b/lib/devres.c
index 6a0e9bd6524a..17624d35e82d 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -9,6 +9,7 @@
 enum devm_ioremap_type {
 	DEVM_IOREMAP = 0,
 	DEVM_IOREMAP_NC,
+	DEVM_IOREMAP_UC,
 	DEVM_IOREMAP_WC,
 };
 
@@ -39,6 +40,9 @@ static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
 	case DEVM_IOREMAP_NC:
 		addr = ioremap_nocache(offset, size);
 		break;
+	case DEVM_IOREMAP_UC:
+		addr = ioremap_uc(offset, size);
+		break;
 	case DEVM_IOREMAP_WC:
 		addr = ioremap_wc(offset, size);
 		break;
@@ -68,6 +72,21 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 }
 EXPORT_SYMBOL(devm_ioremap);
 
+/**
+ * devm_ioremap_uc - Managed ioremap_uc()
+ * @dev: Generic device to remap IO address for
+ * @offset: Resource address to map
+ * @size: Size of map
+ *
+ * Managed ioremap_uc().  Map is automatically unmapped on driver detach.
+ */
+void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
+			      resource_size_t size)
+{
+	return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
+}
+EXPORT_SYMBOL_GPL(devm_ioremap_uc);
+
 /**
  * devm_ioremap_nocache - Managed ioremap_nocache()
  * @dev: Generic device to remap IO address for
-- 
2.23.0