Even on x86-64, I've found the need to break up a readq() into 2 readl() calls. According to the Intel datasheet for the E3-1200 processor:
" Software must not access B0/D0/F0 32-bit memory-mapped registers with requests that cross a DW boundary. " (http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html p. 16) I can confirm this is true via several hard machine lockups. Thus, add explicit hi_lo_[readq|write]_q and lo_hi_[read|write]_q so that these uses are spelled out. Signed-off-by: Jason Baron <jba...@akamai.com> --- include/asm-generic/io-64-nonatomic-hi-lo.h | 14 +++++++++----- include/asm-generic/io-64-nonatomic-lo-hi.h | 14 +++++++++----- 2 files changed, 18 insertions(+), 10 deletions(-) diff --git a/include/asm-generic/io-64-nonatomic-hi-lo.h b/include/asm-generic/io-64-nonatomic-hi-lo.h index a6806a9..2e29d13 100644 --- a/include/asm-generic/io-64-nonatomic-hi-lo.h +++ b/include/asm-generic/io-64-nonatomic-hi-lo.h @@ -4,8 +4,7 @@ #include <linux/io.h> #include <asm-generic/int-ll64.h> -#ifndef readq -static inline __u64 readq(const volatile void __iomem *addr) +static inline __u64 hi_lo_readq(const volatile void __iomem *addr) { const volatile u32 __iomem *p = addr; u32 low, high; @@ -15,14 +14,19 @@ static inline __u64 readq(const volatile void __iomem *addr) return low + ((u64)high << 32); } -#endif -#ifndef writeq -static inline void writeq(__u64 val, volatile void __iomem *addr) +static inline void hi_lo_writeq(__u64 val, volatile void __iomem *addr) { writel(val >> 32, addr + 4); writel(val, addr); } + +#ifndef readq +#define readq hi_lo_readq +#endif + +#ifndef writeq +#define writeq hi_lo_writeq #endif #endif /* _ASM_IO_64_NONATOMIC_HI_LO_H_ */ diff --git a/include/asm-generic/io-64-nonatomic-lo-hi.h b/include/asm-generic/io-64-nonatomic-lo-hi.h index ca546b1..0efacff 100644 --- a/include/asm-generic/io-64-nonatomic-lo-hi.h +++ b/include/asm-generic/io-64-nonatomic-lo-hi.h @@ -4,8 +4,7 @@ #include <linux/io.h> #include <asm-generic/int-ll64.h> -#ifndef readq -static inline __u64 readq(const volatile void __iomem *addr) +static inline __u64 lo_hi_readq(const volatile void __iomem *addr) { const volatile u32 __iomem *p = addr; u32 low, high; @@ -15,14 +14,19 @@ static inline __u64 readq(const volatile void __iomem *addr) return low + ((u64)high << 32); } -#endif -#ifndef writeq -static inline void writeq(__u64 val, volatile void __iomem *addr) +static inline void lo_hi_writeq(__u64 val, volatile void __iomem *addr) { writel(val, addr); writel(val >> 32, addr + 4); } + +#ifndef readq +#define readq lo_hi_readq +#endif + +#ifndef writeq +#define writeq lo_hi_writeq #endif #endif /* _ASM_IO_64_NONATOMIC_LO_HI_H_ */ -- 1.8.2.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
