@@ -435,6 +435,7 @@ static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned lo
{
return ioremap(phys_addr, size);
}
+#define ioremap_cache ioremap_cache
/*
@@ -342,6 +342,7 @@ ioremap_cache(phys_addr_t offset, unsigned long size)
{
return __ioremap_mode(offset, size, PAGE_KERNEL);
}
+#define ioremap_cache ioremap_cache
#ifdef CONFIG_HAVE_IOREMAP_PROT
static inline void __iomem *
@@ -57,6 +57,7 @@ static inline void __iomem *ioremap_cache(unsigned long offset,
else
BUG();
}
+#define ioremap_cache ioremap_cache
#define ioremap_wc ioremap_nocache
#define ioremap_wt ioremap_nocache
@@ -121,4 +121,13 @@ static inline int arch_phys_wc_index(int handle)
#endif
#endif
+enum {
+ /* See memremap() kernel-doc for usage description... */
+ MEMREMAP_WB = 1 << 0,
+ MEMREMAP_WT = 1 << 1,
+};
+
+void *memremap(resource_size_t offset, size_t size, unsigned long flags);
+void memunmap(void *addr);
+
#endif /* _LINUX_IO_H */
@@ -99,6 +99,8 @@ obj-$(CONFIG_JUMP_LABEL) += jump_label.o
obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
obj-$(CONFIG_TORTURE_TEST) += torture.o
+obj-$(CONFIG_HAS_IOMEM) += memremap.o
+
$(obj)/configs.o: $(obj)/config_data.h
# config_data.h contains the same information as ikconfig.h but gzipped.
new file mode 100644
@@ -0,0 +1,98 @@
+/*
+ * Copyright(c) 2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+
+#ifndef ioremap_cache
+/* temporary while we convert existing ioremap_cache users to memremap */
+__weak void __iomem *ioremap_cache(resource_size_t offset, unsigned long size)
+{
+ return ioremap(offset, size);
+}
+#endif
+
+/**
+ * memremap() - remap an iomem_resource as cacheable memory
+ * @offset: iomem resource start address
+ * @size: size of remap
+ * @flags: either MEMREMAP_WB or MEMREMAP_WT
+ *
+ * memremap() is "ioremap" for cases where it is known that the resource
+ * being mapped does not have i/o side effects and the __iomem
+ * annotation is not applicable.
+ *
+ * MEMREMAP_WB - matches the default mapping for "System RAM" on
+ * the architecture. This is usually a read-allocate write-back cache.
+ * Morever, if MEMREMAP_WB is specified and the requested remap region is RAM
+ * memremap() will bypass establishing a new mapping and instead return
+ * a pointer into the direct map.
+ *
+ * MEMREMAP_WT - establish a mapping whereby writes either bypass the
+ * cache or are written through to memory and never exist in a
+ * cache-dirty state with respect to program visibility. Attempts to
+ * map "System RAM" with this mapping type will fail.
+ */
+void *memremap(resource_size_t offset, size_t size, unsigned long flags)
+{
+ int is_ram = region_intersects(offset, size, "System RAM");
+ void *addr = NULL;
+
+ if (is_ram == REGION_MIXED) {
+ WARN_ONCE(1, "memremap attempted on mixed range %pa size: %#lx\n",
+ &offset, (unsigned long) size);
+ return NULL;
+ }
+
+ /* Try all mapping types requested until one returns non-NULL */
+ if (flags & MEMREMAP_WB) {
+ flags &= ~MEMREMAP_WB;
+ /*
+ * MEMREMAP_WB is special in that it can be satisifed
+ * from the direct map. Some archs depend on the
+ * capability of memremap() to autodetect cases where
+ * the requested range is potentially in "System RAM"
+ */
+ if (is_ram == REGION_INTERSECTS)
+ addr = __va(offset);
+ else
+ addr = ioremap_cache(offset, size);
+ }
+
+ /*
+ * If we don't have a mapping yet and more request flags are
+ * pending then we will be attempting to establish a new virtual
+ * address mapping. Enforce that this mapping is not aliasing
+ * "System RAM"
+ */
+ if (!addr && is_ram == REGION_INTERSECTS && flags) {
+ WARN_ONCE(1, "memremap attempted on ram %pa size: %#lx\n",
+ &offset, (unsigned long) size);
+ return NULL;
+ }
+
+ if (!addr && (flags & MEMREMAP_WT)) {
+ flags &= ~MEMREMAP_WT;
+ addr = ioremap_wt(offset, size);
+ }
+
+ return addr;
+}
+EXPORT_SYMBOL(memremap);
+
+void memunmap(void *addr)
+{
+ if (is_vmalloc_addr(addr))
+ iounmap((void __iomem *) addr);
+}
+EXPORT_SYMBOL(memunmap);