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authorSerge Semin <fancer.lancer@gmail.com>2019-06-14 09:33:42 +0300
committerPaul Burton <paul.burton@mips.com>2019-06-24 14:15:02 -0700
commit1e2791448b922069b1d76cb863290c7341ff5eb5 (patch)
tree3ce503548e99b0fe5c6a5f7d747ad40f4363f029 /arch/mips
parent262e4c3893aca09d1749790880d6b9bdb047c0b9 (diff)
mips: Remove q-accessors from non-64bit platforms
There are some generic drivers in the kernel, which make use of the q-accessors or their derivatives. While at current asm/io.h the accessors are defined, their implementation is only applicable either for 64bit systems, or for systems with cpu_has_64bits flag set. Obviously there are MIPS systems which are neither of these, but still need to have those drivers supported. In this case the solution is to define some generic versions of the q-accessors, but with a limitation to be non-atomic. Such accessors are defined in the io-64-nonatomic-{hi-lo,lo-hi}.h file. The drivers which utilize the q-suffixed IO-methods are supposed to include the header file, so in case if these accessors aren't defined for the platform, the generic non-atomic versions are utilized. Currently the MIPS-specific asm/io.h file provides the q-accessors for any MIPS system even for ones, which in fact don't support them and raise BUG() in case if any of them is called. Due to this the generic versions of the accessors are never used while an attempt to call the IO-methods causes the kernel BUG(). In order to fix this we need to define the q-accessors only for the MIPS systems, which actually support them, and don't define them otherwise, so to let the corresponding drivers to use the non-atomic q-suffixed accessors. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Suggested-by: Arnd Bergmann <arnd@arndb.de> Cc: Vadim V. Vlasov <vadim.vlasov@t-platforms.ru> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Serge Semin <Sergey.Semin@t-platforms.ru> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/asm/io.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 29997e42480e..4597017f147b 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -462,7 +462,12 @@ __BUILD_MEMORY_PFX(, bwlq, type, 0)
BUILDIO_MEM(b, u8)
BUILDIO_MEM(w, u16)
BUILDIO_MEM(l, u32)
+#ifdef CONFIG_64BIT
BUILDIO_MEM(q, u64)
+#else
+__BUILD_MEMORY_PFX(__raw_, q, u64, 0)
+__BUILD_MEMORY_PFX(__mem_, q, u64, 0)
+#endif
#define __BUILD_IOPORT_PFX(bus, bwlq, type) \
__BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0,) \
@@ -488,12 +493,16 @@ __BUILDIO(q, u64)
#define readb_relaxed __relaxed_readb
#define readw_relaxed __relaxed_readw
#define readl_relaxed __relaxed_readl
+#ifdef CONFIG_64BIT
#define readq_relaxed __relaxed_readq
+#endif
#define writeb_relaxed __relaxed_writeb
#define writew_relaxed __relaxed_writew
#define writel_relaxed __relaxed_writel
+#ifdef CONFIG_64BIT
#define writeq_relaxed __relaxed_writeq
+#endif
#define readb_be(addr) \
__raw_readb((__force unsigned *)(addr))
@@ -516,8 +525,10 @@ __BUILDIO(q, u64)
/*
* Some code tests for these symbols
*/
+#ifdef CONFIG_64BIT
#define readq readq
#define writeq writeq
+#endif
#define __BUILD_MEMORY_STRING(bwlq, type) \
\