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Date:   Tue, 27 Aug 2019 10:51:36 +0300
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Atish Patra <atish.patra@wdc.com>
Cc:     linux-kernel@vger.kernel.org, Albert Ou <aou@eecs.berkeley.edu>,
        Alan Kao <alankao@andestech.com>,
        Alexios Zavras <alexios.zavras@intel.com>,
        Anup Patel <anup@brainfault.org>,
        Palmer Dabbelt <palmer@sifive.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Gary Guo <gary@garyguo.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-riscv@lists.infradead.org,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC PATCH 1/2] RISC-V: Mark existing SBI as legacy SBI.
References: <20190826233256.32383-1-atish.patra@wdc.com>
 <20190826233256.32383-2-atish.patra@wdc.com>
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On Mon, Aug 26, 2019 at 04:32:55PM -0700, Atish Patra wrote:
> As per the new SBI specification, current SBI implementation is
> defined as legacy and will be removed/replaced in future.
> 
> Rename existing implementation to reflect that. This patch is just
> a preparatory patch for SBI v0.2 and doesn't introduce any functional
> changes.
> 
> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> ---
>  arch/riscv/include/asm/sbi.h | 61 +++++++++++++++++++-----------------
>  1 file changed, 33 insertions(+), 28 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index 21134b3ef404..7f5ecaaaa0d7 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -8,17 +8,18 @@
>  
>  #include <linux/types.h>
>  
> -#define SBI_SET_TIMER 0
> -#define SBI_CONSOLE_PUTCHAR 1
> -#define SBI_CONSOLE_GETCHAR 2
> -#define SBI_CLEAR_IPI 3
> -#define SBI_SEND_IPI 4
> -#define SBI_REMOTE_FENCE_I 5
> -#define SBI_REMOTE_SFENCE_VMA 6
> -#define SBI_REMOTE_SFENCE_VMA_ASID 7
> -#define SBI_SHUTDOWN 8
> -
> -#define SBI_CALL(which, arg0, arg1, arg2, arg3) ({		\
> +
> +#define SBI_EXT_LEGACY_SET_TIMER 0x0
> +#define SBI_EXT_LEGACY_CONSOLE_PUTCHAR 0x1
> +#define SBI_EXT_LEGACY_CONSOLE_GETCHAR 0x2
> +#define SBI_EXT_LEGACY_CLEAR_IPI 0x3
> +#define SBI_EXT_LEGACY_SEND_IPI 0x4
> +#define SBI_EXT_LEGACY_REMOTE_FENCE_I 0x5
> +#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA 0x6
> +#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID 0x7
> +#define SBI_EXT_LEGACY_SHUTDOWN 0x8

I can't say I'm closely following RISC-V development, but what will happen
when SBI v0.3 will come out and will render v0.2 legacy?
Won't we need another similar renaming then?

> +#define SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) ({             \
>  	register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);	\
>  	register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);	\
>  	register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);	\
> @@ -32,58 +33,61 @@
>  })
>  
>  /* Lazy implementations until SBI is finalized */
> -#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0, 0)
> -#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0, 0)
> -#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0, 0)
> -#define SBI_CALL_3(which, arg0, arg1, arg2) \
> -		SBI_CALL(which, arg0, arg1, arg2, 0)
> -#define SBI_CALL_4(which, arg0, arg1, arg2, arg3) \
> -		SBI_CALL(which, arg0, arg1, arg2, arg3)
> +#define SBI_CALL_LEGACY_0(which) SBI_CALL_LEGACY(which, 0, 0, 0, 0)
> +#define SBI_CALL_LEGACY_1(which, arg0) SBI_CALL_LEGACY(which, arg0, 0, 0, 0)
> +#define SBI_CALL_LEGACY_2(which, arg0, arg1) \
> +		SBI_CALL_LEGACY(which, arg0, arg1, 0, 0)
> +#define SBI_CALL_LEGACY_3(which, arg0, arg1, arg2) \
> +		SBI_CALL_LEGACY(which, arg0, arg1, arg2, 0)
> +#define SBI_CALL_LEGACY_4(which, arg0, arg1, arg2, arg3) \
> +		SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3)
>  
>  static inline void sbi_console_putchar(int ch)
>  {
> -	SBI_CALL_1(SBI_CONSOLE_PUTCHAR, ch);
> +	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_CONSOLE_PUTCHAR, ch);
>  }
>  
>  static inline int sbi_console_getchar(void)
>  {
> -	return SBI_CALL_0(SBI_CONSOLE_GETCHAR);
> +	return SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_CONSOLE_GETCHAR);
>  }
>  
>  static inline void sbi_set_timer(uint64_t stime_value)
>  {
>  #if __riscv_xlen == 32
> -	SBI_CALL_2(SBI_SET_TIMER, stime_value, stime_value >> 32);
> +	SBI_CALL_LEGACY_2(SBI_EXT_LEGACY_SET_TIMER, stime_value,
> +			  stime_value >> 32);
>  #else
> -	SBI_CALL_1(SBI_SET_TIMER, stime_value);
> +	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_SET_TIMER, stime_value);
>  #endif
>  }
>  
>  static inline void sbi_shutdown(void)
>  {
> -	SBI_CALL_0(SBI_SHUTDOWN);
> +	SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_SHUTDOWN);
>  }
>  
>  static inline void sbi_clear_ipi(void)
>  {
> -	SBI_CALL_0(SBI_CLEAR_IPI);
> +	SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_CLEAR_IPI);
>  }
>  
>  static inline void sbi_send_ipi(const unsigned long *hart_mask)
>  {
> -	SBI_CALL_1(SBI_SEND_IPI, hart_mask);
> +	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_SEND_IPI, hart_mask);
>  }
>  
>  static inline void sbi_remote_fence_i(const unsigned long *hart_mask)
>  {
> -	SBI_CALL_1(SBI_REMOTE_FENCE_I, hart_mask);
> +	SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_REMOTE_FENCE_I, hart_mask);
>  }
>  
>  static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask,
>  					 unsigned long start,
>  					 unsigned long size)
>  {
> -	SBI_CALL_3(SBI_REMOTE_SFENCE_VMA, hart_mask, start, size);
> +	SBI_CALL_LEGACY_3(SBI_EXT_LEGACY_REMOTE_SFENCE_VMA, hart_mask,
> +			  start, size);
>  }
>  
>  static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
> @@ -91,7 +95,8 @@ static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
>  					      unsigned long size,
>  					      unsigned long asid)
>  {
> -	SBI_CALL_4(SBI_REMOTE_SFENCE_VMA_ASID, hart_mask, start, size, asid);
> +	SBI_CALL_LEGACY_4(SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID, hart_mask,
> +			  start, size, asid);
>  }
>  
>  #endif
> -- 
> 2.21.0
> 
> 
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> 

-- 
Sincerely yours,
Mike.