From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752323AbbHMASY (ORCPT ); Wed, 12 Aug 2015 20:18:24 -0400 Received: from mga01.intel.com ([192.55.52.88]:31319 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752232AbbHMASX (ORCPT ); Wed, 12 Aug 2015 20:18:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,665,1432623600"; d="scan'208";a="767652546" Subject: [PATCH v5 7/8] devres: add devm_memremap From: Dan Williams To: linux-kernel@vger.kernel.org Cc: ross.zwisler@linux.intel.com, mcgrof@suse.com, hch@lst.de, linux-nvdimm@ml01.01.org Date: Wed, 12 Aug 2015 20:12:40 -0400 Message-ID: <20150813001240.17702.93767.stgit@otcpl-skl-sds-2.jf.intel.com> In-Reply-To: <20150813000250.17702.28409.stgit@otcpl-skl-sds-2.jf.intel.com> References: <20150813000250.17702.28409.stgit@otcpl-skl-sds-2.jf.intel.com> User-Agent: StGit/0.17.1-8-g92dd MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christoph Hellwig Signed-off-by: Christoph Hellwig Signed-off-by: Dan Williams --- include/linux/io.h | 4 ++++ kernel/memremap.c | 39 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 43 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..5c9b55eaf121 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 #include #include #include @@ -96,3 +97,41 @@ 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);