linux-kernel - [PATCH 07/10] devm: fix 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: <20150720001811.30857.92541.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:	Sun, 19 Jul 2015 20:18:11 -0400
From:	Dan Williams <dan.j.williams@...el.com>
To:	tglx@...utronix.de, mingo@...nel.org, hpa@...or.com
Cc:	linux-arch@...r.kernel.org, tony.luck@...el.com,
	linux@....linux.org.uk, arnd@...db.de, benh@...nel.crashing.org,
	mcgrof@...e.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	ralf@...ux-mips.org, geert@...ux-m68k.org, toshi.kani@...com,
	ross.zwisler@...ux.intel.com, hch@....de,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 07/10] devm: fix ioremap_cache() usage

Provide devm_ioremap_cache() and fix up devm_ioremap_resource() to
actually provide cacheable mappings.  On archs that implement
ioremap_cache() devm_ioremap_resource() is always silently falling back
to uncached when IORESOURCE_CACHEABLE is specified.

Cc: Toshi Kani <toshi.kani@...com>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 include/linux/io.h |    2 ++
 lib/devres.c       |   53 +++++++++++++++++++++++++---------------------------
 2 files changed, 27 insertions(+), 28 deletions(-)

diff --git a/include/linux/io.h b/include/linux/io.h
index a4b2c1b2aaee..58482241c95c 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -71,6 +71,8 @@ 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_cache(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 dafbad21bfab..eefdebd9f903 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -34,6 +34,8 @@ static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
 	return *(void **)res == match_data;
 }
 
+typedef void __iomem *(*ioremap_fn)(resource_size_t offset, unsigned long size);
+
 /**
  * devm_ioremap - Managed ioremap()
  * @dev: Generic device to remap IO address for
@@ -42,8 +44,9 @@ static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  *
  * Managed ioremap().  Map is automatically unmapped on driver detach.
  */
-void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
-			   resource_size_t size)
+static void __iomem *devm_ioremap_type(struct device *dev,
+		resource_size_t offset, resource_size_t size,
+		ioremap_fn ioremap_type)
 {
 	void __iomem **ptr, *addr;
 
@@ -51,7 +54,7 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 	if (!ptr)
 		return NULL;
 
-	addr = ioremap(offset, size);
+	addr = ioremap_type(offset, size);
 	if (addr) {
 		*ptr = addr;
 		devres_add(dev, ptr);
@@ -60,34 +63,25 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 
 	return addr;
 }
+
+void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
+			   resource_size_t size)
+{
+	return devm_ioremap_type(dev, offset, size, ioremap);
+}
 EXPORT_SYMBOL(devm_ioremap);
 
-/**
- * devm_ioremap_nocache - Managed ioremap_nocache()
- * @dev: Generic device to remap IO address for
- * @offset: BUS offset to map
- * @size: Size of map
- *
- * Managed ioremap_nocache().  Map is automatically unmapped on driver
- * detach.
- */
+void __iomem *devm_ioremap_cache(struct device *dev, resource_size_t offset,
+			   resource_size_t size)
+{
+	return devm_ioremap_type(dev, offset, size, ioremap_cache);
+}
+EXPORT_SYMBOL(devm_ioremap_cache);
+
 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 				   resource_size_t size)
 {
-	void __iomem **ptr, *addr;
-
-	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return NULL;
-
-	addr = ioremap_nocache(offset, size);
-	if (addr) {
-		*ptr = addr;
-		devres_add(dev, ptr);
-	} else
-		devres_free(ptr);
-
-	return addr;
+	return devm_ioremap_type(dev, offset, size, ioremap_nocache);
 }
 EXPORT_SYMBOL(devm_ioremap_nocache);
 
@@ -173,8 +167,11 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 		return IOMEM_ERR_PTR(-EBUSY);
 	}
 
-	/* FIXME: add devm_ioremap_cache support */
-	dest_ptr = devm_ioremap(dev, res->start, size);
+	if (res->flags & IORESOURCE_CACHEABLE)
+		dest_ptr = devm_ioremap_cache(dev, res->start, size);
+	else
+		dest_ptr = devm_ioremap_nocache(dev, res->start, size);
+
 	if (!dest_ptr) {
 		dev_err(dev, "ioremap failed for resource %pR\n", res);
 		devm_release_mem_region(dev, res->start, size);

--
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/