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authorMarc Zyngier <marc.zyngier@arm.com>2014-04-28 22:50:06 +0400
committerCatalin Marinas <catalin.marinas@arm.com>2014-05-04 01:20:31 +0400
commitf774b7d10e2155e52b92dfce2f8cb099a6d6d0e6 (patch)
treedc85b3e72c8e5ece7a5c9dd567bda52d6011635c /include/asm-generic/fixmap.h
parentda6e4cb67c6dd1f72257c0a4a97c26dc4e80d3a7 (diff)
downloadlinux-f774b7d10e2155e52b92dfce2f8cb099a6d6d0e6.tar.xz
arm64: fixmap: fix missing sub-page offset for earlyprintk
Commit d57c33c5daa4 (add generic fixmap.h) added (among other similar things) set_fixmap_io to deal with early ioremap of devices. More recently, commit bf4b558eba92 (arm64: add early_ioremap support) converted the arm64 earlyprintk to use set_fixmap_io. A side effect of this conversion is that my virtual machines have stopped booting when I pass "earlyprintk=uart8250-8bit,0x3f8" to the guest kernel. Turns out that the new earlyprintk code doesn't care at all about sub-page offsets, and just assumes that the earlyprintk device will be page-aligned. Obviously, that doesn't play well with the above example. Further investigation shows that set_fixmap_io uses __set_fixmap instead of __set_fixmap_offset. A fix is to introduce a set_fixmap_offset_io that uses the latter, and to remove the superflous call to fix_to_virt (which only returns the value that set_fixmap_io has already given us). With this applied, my VMs are back in business. Tested on a Cortex-A57 platform with kvmtool as platform emulation. Cc: Will Deacon <will.deacon@arm.com> Acked-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'include/asm-generic/fixmap.h')
-rw-r--r--include/asm-generic/fixmap.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 5a64ca4621f3..f23174fb9ec4 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -93,5 +93,8 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
#define set_fixmap_io(idx, phys) \
__set_fixmap(idx, phys, FIXMAP_PAGE_IO)
+#define set_fixmap_offset_io(idx, phys) \
+ __set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO)
+
#endif /* __ASSEMBLY__ */
#endif /* __ASM_GENERIC_FIXMAP_H */