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authorChristoph Hellwig <hch@lst.de>2015-08-17 16:00:35 +0200
committerDan Williams <dan.j.williams@intel.com>2015-08-27 19:40:58 -0400
commit41e94a851304f7acac840adec4004f8aeee53ad4 (patch)
treefe4c599d1263b7fdd92eb2838e5d223015066718 /include/linux/io.h
parent033fbae988fcb67e5077203512181890848b8e90 (diff)
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add devm_memremap_pages
This behaves like devm_memremap except that it ensures we have page structures available that can back the region. Signed-off-by: Christoph Hellwig <hch@lst.de> [djbw: catch attempts to remap RAM, drop flags] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/io.h')
-rw-r--r--include/linux/io.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h
index d8d749abd665..de64c1e53612 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -20,10 +20,13 @@
#include <linux/types.h>
#include <linux/init.h>
+#include <linux/bug.h>
+#include <linux/err.h>
#include <asm/io.h>
#include <asm/page.h>
struct device;
+struct resource;
__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
@@ -84,6 +87,23 @@ void *devm_memremap(struct device *dev, resource_size_t offset,
size_t size, unsigned long flags);
void devm_memunmap(struct device *dev, void *addr);
+void *__devm_memremap_pages(struct device *dev, struct resource *res);
+
+#ifdef CONFIG_ZONE_DEVICE
+void *devm_memremap_pages(struct device *dev, struct resource *res);
+#else
+static inline void *devm_memremap_pages(struct device *dev, struct resource *res)
+{
+ /*
+ * Fail attempts to call devm_memremap_pages() without
+ * ZONE_DEVICE support enabled, this requires callers to fall
+ * back to plain devm_memremap() based on config
+ */
+ WARN_ON_ONCE(1);
+ return ERR_PTR(-ENXIO);
+}
+#endif
+
/*
* Some systems do not have legacy ISA devices.
* /dev/port is not a valid interface on these systems.