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Date: Mon, 10 Aug 2015 23:38:38 -0400 From: Dan Williams <dan.j.williams@...el.com> To: linux-kernel@...r.kernel.org Cc: ross.zwisler@...ux.intel.com, mcgrof@...e.com, hch@....de, linux-nvdimm@...ts.01.org Subject: [PATCH v4 09/10] devres: add devm_memremap From: Christoph Hellwig <hch@....de> Signed-off-by: Christoph Hellwig <hch@....de> Signed-off-by: Dan Williams <dan.j.williams@...el.com> --- include/linux/io.h | 4 ++++ kernel/memremap.c | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/include/linux/io.h b/include/linux/io.h index 3fcf6256c088..d8d749abd665 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -80,6 +80,10 @@ int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length); void devm_ioremap_release(struct device *dev, void *res); +void *devm_memremap(struct device *dev, resource_size_t offset, + size_t size, unsigned long flags); +void devm_memunmap(struct device *dev, void *addr); + /* * Some systems do not have legacy ISA devices. * /dev/port is not a valid interface on these systems. diff --git a/kernel/memremap.c b/kernel/memremap.c index a293de52e837..1dbe88088aa1 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -10,6 +10,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ +#include <linux/device.h> #include <linux/types.h> #include <linux/io.h> #include <linux/mm.h> @@ -96,3 +97,42 @@ void memunmap(void *addr) iounmap((void __iomem *) addr); } EXPORT_SYMBOL(memunmap); + +static void devm_memremap_release(struct device *dev, void *res) +{ + memunmap(res); +} + +static int devm_memremap_match(struct device *dev, void *res, void *match_data) +{ + return *(void **)res == match_data; +} + +void *devm_memremap(struct device *dev, resource_size_t offset, + size_t size, unsigned long flags) +{ + void **ptr, *addr; + + ptr = devres_alloc(devm_memremap_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return NULL; + + addr = memremap(offset, size, flags); + if (addr) { + *ptr = addr; + devres_add(dev, ptr); + } else + devres_free(ptr); + + return addr; +} +EXPORT_SYMBOL(devm_memremap); + +void devm_memunmap(struct device *dev, void *addr) +{ + WARN_ON(devres_destroy(dev, devm_memremap_release, devm_memremap_match, + addr)); + memunmap(addr); +} +EXPORT_SYMBOL(devm_memunmap); + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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