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Message-ID: <dfc70cc1-09a9-f6d0-83a8-c8ca5d7a232b@deltatee.com>
Date: Sat, 24 Jun 2017 09:19:42 -0600
From: Logan Gunthorpe <logang@...tatee.com>
To: Richard Henderson <rth@...ddle.net>, linux-kernel@...r.kernel.org
Cc: linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Matt Turner <mattst88@...il.com>
Subject: Re: [PATCH] alpha: provide ioread64 and iowrite64 implementations
Hey,
On 24/06/17 09:13 AM, Richard Henderson wrote:
> All Alpha hosts except for Jensen provide 64-bit I/O operations.
>
> Jensen is EISA only, so there ought not be any devices that even
> attempt such operations. But just in case, use 2 32-bit operations.
Thanks for this, Richard.
However, I was recently enlightened by the existence of the
linux/io-64-nonatomic* headers. This is where the 2 32-bit operation
functions belong. So you should probably remove them from this patch and
let drivers that need them just include those headers.
Logan
> Cc: Logan Gunthorpe <logang@...tatee.com>
> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> Cc: Matt Turner <mattst88@...il.com>
> Signed-off-by: Richard Henderson <rth@...ddle.net>
> ---
> arch/alpha/include/asm/core_apecs.h | 16 ++++++++++++++++
> arch/alpha/include/asm/core_cia.h | 16 ++++++++++++++++
> arch/alpha/include/asm/core_lca.h | 16 ++++++++++++++++
> arch/alpha/include/asm/core_mcpcia.h | 21 +++++++++++++++++++++
> arch/alpha/include/asm/core_t2.h | 24 +++++++++++++++++++-----
> arch/alpha/include/asm/io.h | 27 +++++++++++++++++++++++++++
> arch/alpha/include/asm/io_trivial.h | 12 ++++++++++++
> arch/alpha/include/asm/jensen.h | 32 +++++++++++++++++++++++++++-----
> arch/alpha/include/asm/machvec.h | 2 ++
> arch/alpha/kernel/io.c | 27 +++++++++++++++++++++++++++
> arch/alpha/kernel/machvec_impl.h | 2 ++
> 11 files changed, 185 insertions(+), 10 deletions(-)
>
> diff --git a/arch/alpha/include/asm/core_apecs.h b/arch/alpha/include/asm/core_apecs.h
> index 6785ff7..7e2ff13 100644
> --- a/arch/alpha/include/asm/core_apecs.h
> +++ b/arch/alpha/include/asm/core_apecs.h
> @@ -471,6 +471,22 @@ __EXTERN_INLINE void apecs_iowrite32(u32 b, void __iomem *xaddr)
> *(vuip)addr = b;
> }
>
> +__EXTERN_INLINE u64 apecs_ioread64(void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long) xaddr;
> + if (addr < APECS_DENSE_MEM)
> + addr = ((addr - APECS_IO) << 5) + APECS_IO + 0x78;
> + return *(vulp)addr;
> +}
> +
> +__EXTERN_INLINE void apecs_iowrite64(u64 b, void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long) xaddr;
> + if (addr < APECS_DENSE_MEM)
> + addr = ((addr - APECS_IO) << 5) + APECS_IO + 0x78;
> + *(vulp)addr = b;
> +}
> +
> __EXTERN_INLINE void __iomem *apecs_ioportmap(unsigned long addr)
> {
> return (void __iomem *)(addr + APECS_IO);
> diff --git a/arch/alpha/include/asm/core_cia.h b/arch/alpha/include/asm/core_cia.h
> index 9e0516c..54792b3 100644
> --- a/arch/alpha/include/asm/core_cia.h
> +++ b/arch/alpha/include/asm/core_cia.h
> @@ -419,6 +419,22 @@ __EXTERN_INLINE void cia_iowrite32(u32 b, void __iomem *xaddr)
> *(vuip)addr = b;
> }
>
> +__EXTERN_INLINE u64 cia_ioread64(void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long) xaddr;
> + if (addr < CIA_DENSE_MEM)
> + addr = ((addr - CIA_IO) << 5) + CIA_IO + 0x78;
> + return *(vulp)addr;
> +}
> +
> +__EXTERN_INLINE void cia_iowrite64(u64 b, void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long) xaddr;
> + if (addr < CIA_DENSE_MEM)
> + addr = ((addr - CIA_IO) << 5) + CIA_IO + 0x78;
> + *(vulp)addr = b;
> +}
> +
> __EXTERN_INLINE void __iomem *cia_ioportmap(unsigned long addr)
> {
> return (void __iomem *)(addr + CIA_IO);
> diff --git a/arch/alpha/include/asm/core_lca.h b/arch/alpha/include/asm/core_lca.h
> index 8ee6c51..b8e43cd 100644
> --- a/arch/alpha/include/asm/core_lca.h
> +++ b/arch/alpha/include/asm/core_lca.h
> @@ -317,6 +317,22 @@ __EXTERN_INLINE void lca_iowrite32(u32 b, void __iomem *xaddr)
> *(vuip)addr = b;
> }
>
> +__EXTERN_INLINE u64 lca_ioread64(void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long) xaddr;
> + if (addr < LCA_DENSE_MEM)
> + addr = ((addr - LCA_IO) << 5) + LCA_IO + 0x78;
> + return *(vulp)addr;
> +}
> +
> +__EXTERN_INLINE void lca_iowrite64(u64 b, void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long) xaddr;
> + if (addr < LCA_DENSE_MEM)
> + addr = ((addr - LCA_IO) << 5) + LCA_IO + 0x78;
> + *(vulp)addr = b;
> +}
> +
> __EXTERN_INLINE void __iomem *lca_ioportmap(unsigned long addr)
> {
> return (void __iomem *)(addr + LCA_IO);
> diff --git a/arch/alpha/include/asm/core_mcpcia.h b/arch/alpha/include/asm/core_mcpcia.h
> index ad44bef..e4d9139 100644
> --- a/arch/alpha/include/asm/core_mcpcia.h
> +++ b/arch/alpha/include/asm/core_mcpcia.h
> @@ -247,6 +247,7 @@ struct el_MCPCIA_uncorrected_frame_mcheck {
>
> #define vip volatile int __force *
> #define vuip volatile unsigned int __force *
> +#define vulp volatile unsigned long __force *
>
> #ifndef MCPCIA_ONE_HAE_WINDOW
> #define MCPCIA_FROB_MMIO \
> @@ -334,6 +335,25 @@ __EXTERN_INLINE void mcpcia_iowrite32(u32 b, void __iomem *xaddr)
> *(vuip)addr = b;
> }
>
> +__EXTERN_INLINE u64 mcpcia_ioread64(void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long)xaddr;
> +
> + if (!__mcpcia_is_mmio(addr))
> + addr = ((addr & 0xffff) << 5) + (addr & ~0xfffful) + 0x78;
> +
> + return *(vulp)addr;
> +}
> +
> +__EXTERN_INLINE void mcpcia_iowrite64(u64 b, void __iomem *xaddr)
> +{
> + unsigned long addr = (unsigned long)xaddr;
> +
> + if (!__mcpcia_is_mmio(addr))
> + addr = ((addr & 0xffff) << 5) + (addr & ~0xfffful) + 0x78;
> +
> + *(vulp)addr = b;
> +}
>
> __EXTERN_INLINE void __iomem *mcpcia_ioportmap(unsigned long addr)
> {
> @@ -361,6 +381,7 @@ __EXTERN_INLINE int mcpcia_is_mmio(const volatile void __iomem *xaddr)
>
> #undef vip
> #undef vuip
> +#undef vulp
>
> #undef __IO_PREFIX
> #define __IO_PREFIX mcpcia
> diff --git a/arch/alpha/include/asm/core_t2.h b/arch/alpha/include/asm/core_t2.h
> index ade9d92..cb3467d 100644
> --- a/arch/alpha/include/asm/core_t2.h
> +++ b/arch/alpha/include/asm/core_t2.h
> @@ -359,6 +359,7 @@ struct el_t2_frame_corrected {
>
> #define vip volatile int *
> #define vuip volatile unsigned int *
> +#define vulp volatile unsigned long *
>
> extern inline u8 t2_inb(unsigned long addr)
> {
> @@ -401,6 +402,17 @@ extern inline void t2_outl(u32 b, unsigned long addr)
> mb();
> }
>
> +extern inline u64 t2_inq(unsigned long addr)
> +{
> + return *(vulp) ((addr << 5) + T2_IO + 0x78);
> +}
> +
> +extern inline void t2_outq(u64 b, unsigned long addr)
> +{
> + *(vulp) ((addr << 5) + T2_IO + 0x78) = b;
> + mb();
> +}
> +
>
> /*
> * Memory functions.
> @@ -570,8 +582,8 @@ __EXTERN_INLINE int t2_is_mmio(const volatile void __iomem *addr)
> /* New-style ioread interface. The mmio routines are so ugly for T2 that
> it doesn't make sense to merge the pio and mmio routines. */
>
> -#define IOPORT(OS, NS) \
> -__EXTERN_INLINE unsigned int t2_ioread##NS(void __iomem *xaddr) \
> +#define IOPORT(OS, NS, RT) \
> +__EXTERN_INLINE RT t2_ioread##NS(void __iomem *xaddr) \
> { \
> if (t2_is_mmio(xaddr)) \
> return t2_read##OS(xaddr); \
> @@ -586,14 +598,16 @@ __EXTERN_INLINE void t2_iowrite##NS(u##NS b, void __iomem *xaddr) \
> t2_out##OS(b, (unsigned long)xaddr - T2_IO); \
> }
>
> -IOPORT(b, 8)
> -IOPORT(w, 16)
> -IOPORT(l, 32)
> +IOPORT(b, 8, unsigned int)
> +IOPORT(w, 16, unsigned int)
> +IOPORT(l, 32, unsigned int)
> +IOPORT(q, 64, u64)
>
> #undef IOPORT
>
> #undef vip
> #undef vuip
> +#undef vulp
>
> #undef __IO_PREFIX
> #define __IO_PREFIX t2
> diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
> index ff40491..16426e8 100644
> --- a/arch/alpha/include/asm/io.h
> +++ b/arch/alpha/include/asm/io.h
> @@ -158,6 +158,7 @@ static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
> REMAP1(unsigned int, ioread8, /**/)
> REMAP1(unsigned int, ioread16, /**/)
> REMAP1(unsigned int, ioread32, /**/)
> +REMAP1(u64, ioread64, /**/)
> REMAP1(u8, readb, const volatile)
> REMAP1(u16, readw, const volatile)
> REMAP1(u32, readl, const volatile)
> @@ -166,6 +167,7 @@ REMAP1(u64, readq, const volatile)
> REMAP2(u8, iowrite8, /**/)
> REMAP2(u16, iowrite16, /**/)
> REMAP2(u32, iowrite32, /**/)
> +REMAP2(u64, iowrite64, /**/)
> REMAP2(u8, writeb, volatile)
> REMAP2(u16, writew, volatile)
> REMAP2(u32, writel, volatile)
> @@ -384,6 +386,19 @@ extern inline void iowrite32(u32 b, void __iomem *addr)
> mb();
> }
>
> +extern inline u64 ioread64(void __iomem *addr)
> +{
> + unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr);
> + mb();
> + return ret;
> +}
> +
> +extern inline void iowrite64(u64 b, void __iomem *addr)
> +{
> + IO_CONCAT(__IO_PREFIX,iowrite64)(b, addr);
> + mb();
> +}
> +
> extern inline u32 inl(unsigned long port)
> {
> return ioread32(ioport_map(port, 4));
> @@ -393,6 +408,16 @@ extern inline void outl(u32 b, unsigned long port)
> {
> iowrite32(b, ioport_map(port, 4));
> }
> +
> +extern inline u64 inq(unsigned long port)
> +{
> + return ioread64(ioport_map(port, 8));
> +}
> +
> +extern inline void outq(u64 b, unsigned long port)
> +{
> + iowrite64(b, ioport_map(port, 8));
> +}
> #endif
>
> #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
> @@ -493,8 +518,10 @@ extern inline void writeq(u64 b, volatile void __iomem *addr)
>
> #define ioread16be(p) be16_to_cpu(ioread16(p))
> #define ioread32be(p) be32_to_cpu(ioread32(p))
> +#define ioread64be(p) be64_to_cpu(ioread64(p))
> #define iowrite16be(v,p) iowrite16(cpu_to_be16(v), (p))
> #define iowrite32be(v,p) iowrite32(cpu_to_be32(v), (p))
> +#define iowrite64be(v,p) iowrite64(cpu_to_be64(v), (p))
>
> #define inb_p inb
> #define inw_p inw
> diff --git a/arch/alpha/include/asm/io_trivial.h b/arch/alpha/include/asm/io_trivial.h
> index 1c77f10..ae97730 100644
> --- a/arch/alpha/include/asm/io_trivial.h
> +++ b/arch/alpha/include/asm/io_trivial.h
> @@ -37,11 +37,23 @@ IO_CONCAT(__IO_PREFIX,ioread32)(void __iomem *a)
> return *(volatile u32 __force *)a;
> }
>
> +__EXTERN_INLINE u64
> +IO_CONCAT(__IO_PREFIX,ioread64)(void __iomem *a)
> +{
> + return *(volatile u64 __force *)a;
> +}
> +
> __EXTERN_INLINE void
> IO_CONCAT(__IO_PREFIX,iowrite32)(u32 b, void __iomem *a)
> {
> *(volatile u32 __force *)a = b;
> }
> +
> +__EXTERN_INLINE void
> +IO_CONCAT(__IO_PREFIX,iowrite64)(u64 b, void __iomem *a)
> +{
> + *(volatile u64 __force *)a = b;
> +}
> #endif
>
> #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
> diff --git a/arch/alpha/include/asm/jensen.h b/arch/alpha/include/asm/jensen.h
> index 964b06e..7e945cf 100644
> --- a/arch/alpha/include/asm/jensen.h
> +++ b/arch/alpha/include/asm/jensen.h
> @@ -182,6 +182,17 @@ __EXTERN_INLINE u32 jensen_inl(unsigned long addr)
> return *(vuip) ((addr << 7) + EISA_IO + 0x60);
> }
>
> +__EXTERN_INLINE u64 jensen_inq(unsigned long addr)
> +{
> + unsigned long ioaddr = (addr << 7) + EISA_IO + 0x60;
> + unsigned long l, h;
> +
> + jensen_set_hae(0);
> + l = *(vuip)ioaddr;
> + h = *(vuip)(ioaddr + (4 << 7));
> + return h << 32 | l;
> +}
> +
> __EXTERN_INLINE void jensen_outw(u16 b, unsigned long addr)
> {
> jensen_set_hae(0);
> @@ -196,6 +207,16 @@ __EXTERN_INLINE void jensen_outl(u32 b, unsigned long addr)
> mb();
> }
>
> +__EXTERN_INLINE void jensen_outq(u64 b, unsigned long addr)
> +{
> + unsigned long ioaddr = (addr << 7) + EISA_IO + 0x60;
> +
> + jensen_set_hae(0);
> + *(vuip)ioaddr = b;
> + *(vuip)(ioaddr + (4 << 7)) = b >> 32;
> + mb();
> +}
> +
> /*
> * Memory functions.
> */
> @@ -303,8 +324,8 @@ __EXTERN_INLINE int jensen_is_mmio(const volatile void __iomem *addr)
> /* New-style ioread interface. All the routines are so ugly for Jensen
> that it doesn't make sense to merge them. */
>
> -#define IOPORT(OS, NS) \
> -__EXTERN_INLINE unsigned int jensen_ioread##NS(void __iomem *xaddr) \
> +#define IOPORT(OS, NS, RT) \
> +__EXTERN_INLINE RT jensen_ioread##NS(void __iomem *xaddr) \
> { \
> if (jensen_is_mmio(xaddr)) \
> return jensen_read##OS(xaddr - 0x100000000ul); \
> @@ -319,9 +340,10 @@ __EXTERN_INLINE void jensen_iowrite##NS(u##NS b, void __iomem *xaddr) \
> jensen_out##OS(b, (unsigned long)xaddr); \
> }
>
> -IOPORT(b, 8)
> -IOPORT(w, 16)
> -IOPORT(l, 32)
> +IOPORT(b, 8, unsigned int)
> +IOPORT(w, 16, unsigned int)
> +IOPORT(l, 32, unsigned int)
> +IOPORT(q, 64, u64)
>
> #undef IOPORT
>
> diff --git a/arch/alpha/include/asm/machvec.h b/arch/alpha/include/asm/machvec.h
> index 75cb364..c037c7b 100644
> --- a/arch/alpha/include/asm/machvec.h
> +++ b/arch/alpha/include/asm/machvec.h
> @@ -48,10 +48,12 @@ struct alpha_machine_vector
> unsigned int (*mv_ioread8)(void __iomem *);
> unsigned int (*mv_ioread16)(void __iomem *);
> unsigned int (*mv_ioread32)(void __iomem *);
> + u64 (*mv_ioread64)(void __iomem *);
>
> void (*mv_iowrite8)(u8, void __iomem *);
> void (*mv_iowrite16)(u16, void __iomem *);
> void (*mv_iowrite32)(u32, void __iomem *);
> + void (*mv_iowrite64)(u64, void __iomem *);
>
> u8 (*mv_readb)(const volatile void __iomem *);
> u16 (*mv_readw)(const volatile void __iomem *);
> diff --git a/arch/alpha/kernel/io.c b/arch/alpha/kernel/io.c
> index 19c5875..d36146f 100644
> --- a/arch/alpha/kernel/io.c
> +++ b/arch/alpha/kernel/io.c
> @@ -34,6 +34,13 @@ unsigned int ioread32(void __iomem *addr)
> return ret;
> }
>
> +u64 ioread64(void __iomem *addr)
> +{
> + u64 ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr);
> + mb();
> + return ret;
> +}
> +
> void iowrite8(u8 b, void __iomem *addr)
> {
> IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
> @@ -52,12 +59,20 @@ void iowrite32(u32 b, void __iomem *addr)
> mb();
> }
>
> +void iowrite64(u64 b, void __iomem *addr)
> +{
> + IO_CONCAT(__IO_PREFIX,iowrite64)(b, addr);
> + mb();
> +}
> +
> EXPORT_SYMBOL(ioread8);
> EXPORT_SYMBOL(ioread16);
> EXPORT_SYMBOL(ioread32);
> +EXPORT_SYMBOL(ioread64);
> EXPORT_SYMBOL(iowrite8);
> EXPORT_SYMBOL(iowrite16);
> EXPORT_SYMBOL(iowrite32);
> +EXPORT_SYMBOL(iowrite64);
>
> u8 inb(unsigned long port)
> {
> @@ -74,6 +89,11 @@ u32 inl(unsigned long port)
> return ioread32(ioport_map(port, 4));
> }
>
> +u64 inq(unsigned long port)
> +{
> + return ioread64(ioport_map(port, 8));
> +}
> +
> void outb(u8 b, unsigned long port)
> {
> iowrite8(b, ioport_map(port, 1));
> @@ -89,12 +109,19 @@ void outl(u32 b, unsigned long port)
> iowrite32(b, ioport_map(port, 4));
> }
>
> +void outq(u64 b, unsigned long port)
> +{
> + iowrite64(b, ioport_map(port, 8));
> +}
> +
> EXPORT_SYMBOL(inb);
> EXPORT_SYMBOL(inw);
> EXPORT_SYMBOL(inl);
> +EXPORT_SYMBOL(inq);
> EXPORT_SYMBOL(outb);
> EXPORT_SYMBOL(outw);
> EXPORT_SYMBOL(outl);
> +EXPORT_SYMBOL(outq);
>
> u8 __raw_readb(const volatile void __iomem *addr)
> {
> diff --git a/arch/alpha/kernel/machvec_impl.h b/arch/alpha/kernel/machvec_impl.h
> index b7d6960..9b37e19 100644
> --- a/arch/alpha/kernel/machvec_impl.h
> +++ b/arch/alpha/kernel/machvec_impl.h
> @@ -79,9 +79,11 @@
> .mv_ioread8 = CAT(low,_ioread8), \
> .mv_ioread16 = CAT(low,_ioread16), \
> .mv_ioread32 = CAT(low,_ioread32), \
> + .mv_ioread64 = CAT(low,_ioread64), \
> .mv_iowrite8 = CAT(low,_iowrite8), \
> .mv_iowrite16 = CAT(low,_iowrite16), \
> .mv_iowrite32 = CAT(low,_iowrite32), \
> + .mv_iowrite64 = CAT(low,_iowrite64), \
> .mv_readb = CAT(low,_readb), \
> .mv_readw = CAT(low,_readw), \
> .mv_readl = CAT(low,_readl), \
>
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