[RFC PATCH 1/2] memremap: add arch specific hook for MEMREMAP_WB mappings

[Ard Biesheuvel]

Currently, the memremap code serves MEMREMAP_WB mappings directly from
the kernel direct mapping, unless the region is in high memory, in which
case it falls back to using ioremap_cache(). However, the semantics of
ioremap_cache() are not unambiguously defined, and on ARM, it will
actually result in a mapping type that differs from the attributes used
for the linear mapping, and for this reason, the ioremap_cache() call
fails if the region is part of the memory managed by the kernel.

So instead, implement an optional hook 'arch_memremap_wb' whose default
implementation calls ioremap_cache() as before, but which can be
overridden by the architecture to do what is appropriate for it.

Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
 kernel/memremap.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/memremap.c b/kernel/memremap.c
index 7a1b5c3ef14e..77c41648ba16 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -27,6 +27,13 @@ __weak void __iomem *ioremap_cache(resource_size_t offset, unsigned long size)
 }
 #endif
 
+#ifndef arch_memremap_wb
+static void *arch_memremap_wb(resource_size_t offset, unsigned long size)
+{
+	return (__force void *)ioremap_cache(offset, size);
+}
+#endif
+
 static void *try_ram_remap(resource_size_t offset, size_t size)
 {
 	struct page *page = pfn_to_page(offset >> PAGE_SHIFT);
@@ -34,7 +41,7 @@ static void *try_ram_remap(resource_size_t offset, size_t size)
 	/* In the simple case just return the existing linear address */
 	if (!PageHighMem(page))
 		return __va(offset);
-	return NULL; /* fallback to ioremap_cache */
+	return arch_memremap_wb(offset, size);
 }
 
 /**
@@ -80,8 +87,6 @@ void *memremap(resource_size_t offset, size_t size, unsigned long flags)
 		 */
 		if (is_ram == REGION_INTERSECTS)
 			addr = try_ram_remap(offset, size);
-		if (!addr)
-			addr = ioremap_cache(offset, size);
 	}
 
 	/*
-- 
2.5.0