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| author | Marc Zyngier <marc.zyngier@arm.com> | 2014-04-28 20:50:06 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-05-03 23:20:31 +0200 |
| commit | f774b7d10e2155e52b92dfce2f8cb099a6d6d0e6 (patch) | |
| tree | dc85b3e72c8e5ece7a5c9dd567bda52d6011635c /include/asm-generic/fixmap.h | |
| parent | arm64: Fix for the arm64 kern_addr_valid() function (diff) | |
| download | linux-f774b7d10e2155e52b92dfce2f8cb099a6d6d0e6.tar.xz linux-f774b7d10e2155e52b92dfce2f8cb099a6d6d0e6.zip | |
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 '')
| -rw-r--r-- | include/asm-generic/fixmap.h | 3 |
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 */ |