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Date:	Wed, 19 Nov 2008 15:47:07 +0800
From:	"Bryan Wu" <cooloney@...nel.org>
To:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org, "Graf Yang" <graf.yang@...log.com>,
	"Bryan Wu" <cooloney@...nel.org>, linux-arch@...r.kernel.org
Subject: Re: [PATCH 5/5] Blackfin arch: SMP supporting patchset: some other misc code

Cc, linux-arch
-Bryan

On Tue, Nov 18, 2008 at 5:05 PM, Bryan Wu <cooloney@...nel.org> wrote:
> From: Graf Yang <graf.yang@...log.com>
>
> Blackfin dual core BF561 processor can support SMP like features.
> https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like
>
> In this patch, we provide SMP extend to some other misc code
>
> Singed-off-by: Graf Yang <graf.yang@...log.com>
> Signed-off-by: Bryan Wu <cooloney@...nel.org>
> ---
>  arch/blackfin/Kconfig                           |   32 +++++++++++++++++++++-
>  arch/blackfin/kernel/vmlinux.lds.S              |    4 +-
>  arch/blackfin/mach-bf518/include/mach/mem_map.h |   15 ++++++++++
>  arch/blackfin/mach-bf527/include/mach/mem_map.h |   15 ++++++++++
>  arch/blackfin/mach-bf533/include/mach/mem_map.h |   15 ++++++++++
>  arch/blackfin/mach-bf537/include/mach/mem_map.h |   15 ++++++++++
>  arch/blackfin/mach-bf538/include/mach/mem_map.h |   15 ++++++++++
>  arch/blackfin/mach-bf548/include/mach/mem_map.h |   15 ++++++++++
>  8 files changed, 122 insertions(+), 4 deletions(-)
>
> diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
> index 004c06c..7fc8a51 100644
> --- a/arch/blackfin/Kconfig
> +++ b/arch/blackfin/Kconfig
> @@ -200,6 +200,32 @@ config BF561
>
>  endchoice
>
> +config SMP
> +       depends on BF561
> +       bool "Symmetric multi-processing support"
> +       ---help---
> +         This enables support for systems with more than one CPU,
> +         like the dual core BF561. If you have a system with only one
> +         CPU, say N. If you have a system with more than one CPU, say Y.
> +
> +         If you don't know what to do here, say N.
> +
> +config NR_CPUS
> +       int
> +       depends on SMP
> +       default 2 if BF561
> +
> +config IRQ_PER_CPU
> +       bool
> +       depends on SMP
> +       default y
> +
> +config TICK_SOURCE_SYSTMR0
> +       bool
> +       select BFIN_GPTIMERS
> +       depends on SMP
> +       default y
> +
>  config BF_REV_MIN
>        int
>        default 0 if (BF51x || BF52x || BF54x)
> @@ -502,6 +528,7 @@ source kernel/Kconfig.hz
>
>  config GENERIC_TIME
>        bool "Generic time"
> +       depends on !SMP
>        default y
>
>  config GENERIC_CLOCKEVENTS
> @@ -576,6 +603,7 @@ endmenu
>
>
>  menu "Blackfin Kernel Optimizations"
> +       depends on !SMP
>
>  comment "Memory Optimizations"
>
> @@ -738,7 +766,6 @@ config BFIN_INS_LOWOVERHEAD
>
>  endmenu
>
> -
>  choice
>        prompt "Kernel executes from"
>        help
> @@ -804,7 +831,8 @@ config BFIN_ICACHE_LOCK
>  choice
>        prompt "Policy"
>        depends on BFIN_DCACHE
> -       default BFIN_WB
> +       default BFIN_WB if !SMP
> +       default BFIN_WT if SMP
>  config BFIN_WB
>        bool "Write back"
>        help
> diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S
> index 7d12c66..2a48535 100644
> --- a/arch/blackfin/kernel/vmlinux.lds.S
> +++ b/arch/blackfin/kernel/vmlinux.lds.S
> @@ -109,7 +109,7 @@ SECTIONS
>  #endif
>
>                DATA_DATA
> -               *(.data.*)
> +               *(.data)
>                CONSTRUCTORS
>
>                /* make sure the init_task is aligned to the
> @@ -161,6 +161,7 @@ SECTIONS
>                *(.con_initcall.init)
>                ___con_initcall_end = .;
>        }
> +       PERCPU(4)
>        SECURITY_INIT
>        .init.ramfs :
>        {
> @@ -236,7 +237,6 @@ SECTIONS
>                . = ALIGN(4);
>                __ebss_l2 = .;
>        }
> -
>        /* Force trailing alignment of our init section so that when we
>         * free our init memory, we don't leave behind a partial page.
>         */
> diff --git a/arch/blackfin/mach-bf518/include/mach/mem_map.h b/arch/blackfin/mach-bf518/include/mach/mem_map.h
> index 10f678f..ac95d33 100644
> --- a/arch/blackfin/mach-bf518/include/mach/mem_map.h
> +++ b/arch/blackfin/mach-bf518/include/mach/mem_map.h
> @@ -99,4 +99,19 @@
>  #define L1_SCRATCH_START       0xFFB00000
>  #define L1_SCRATCH_LENGTH      0x1000
>
> +#define get_l1_scratch_start_cpu(cpu)          L1_SCRATCH_START
> +#define get_l1_code_start_cpu(cpu)             L1_CODE_START
> +#define get_l1_data_a_start_cpu(cpu)           L1_DATA_A_START
> +#define get_l1_data_b_start_cpu(cpu)           L1_DATA_B_START
> +#define get_l1_scratch_start()                 L1_SCRATCH_START
> +#define get_l1_code_start()                    L1_CODE_START
> +#define get_l1_data_a_start()                  L1_DATA_A_START
> +#define get_l1_data_b_start()                  L1_DATA_B_START
> +
> +#define GET_PDA_SAFE(preg)             \
> +       preg.l = _cpu_pda;              \
> +       preg.h = _cpu_pda;
> +
> +#define GET_PDA(preg, dreg)    GET_PDA_SAFE(preg)
> +
>  #endif                         /* _MEM_MAP_518_H_ */
> diff --git a/arch/blackfin/mach-bf527/include/mach/mem_map.h b/arch/blackfin/mach-bf527/include/mach/mem_map.h
> index ef46dc9..bd7fe0f 100644
> --- a/arch/blackfin/mach-bf527/include/mach/mem_map.h
> +++ b/arch/blackfin/mach-bf527/include/mach/mem_map.h
> @@ -99,4 +99,19 @@
>  #define L1_SCRATCH_START       0xFFB00000
>  #define L1_SCRATCH_LENGTH      0x1000
>
> +#define get_l1_scratch_start_cpu(cpu)          L1_SCRATCH_START
> +#define get_l1_code_start_cpu(cpu)             L1_CODE_START
> +#define get_l1_data_a_start_cpu(cpu)           L1_DATA_A_START
> +#define get_l1_data_b_start_cpu(cpu)           L1_DATA_B_START
> +#define get_l1_scratch_start()                 L1_SCRATCH_START
> +#define get_l1_code_start()                    L1_CODE_START
> +#define get_l1_data_a_start()                  L1_DATA_A_START
> +#define get_l1_data_b_start()                  L1_DATA_B_START
> +
> +#define GET_PDA_SAFE(preg)             \
> +       preg.l = _cpu_pda;              \
> +       preg.h = _cpu_pda;
> +
> +#define GET_PDA(preg, dreg)    GET_PDA_SAFE(preg)
> +
>  #endif                         /* _MEM_MAP_527_H_ */
> diff --git a/arch/blackfin/mach-bf533/include/mach/mem_map.h b/arch/blackfin/mach-bf533/include/mach/mem_map.h
> index 581fc6e..d5eaef2 100644
> --- a/arch/blackfin/mach-bf533/include/mach/mem_map.h
> +++ b/arch/blackfin/mach-bf533/include/mach/mem_map.h
> @@ -168,4 +168,19 @@
>  #define L1_SCRATCH_START       0xFFB00000
>  #define L1_SCRATCH_LENGTH      0x1000
>
> +#define get_l1_scratch_start_cpu(cpu)          L1_SCRATCH_START
> +#define get_l1_code_start_cpu(cpu)             L1_CODE_START
> +#define get_l1_data_a_start_cpu(cpu)           L1_DATA_A_START
> +#define get_l1_data_b_start_cpu(cpu)           L1_DATA_B_START
> +#define get_l1_scratch_start()                 L1_SCRATCH_START
> +#define get_l1_code_start()                    L1_CODE_START
> +#define get_l1_data_a_start()                  L1_DATA_A_START
> +#define get_l1_data_b_start()                  L1_DATA_B_START
> +
> +#define GET_PDA_SAFE(preg)             \
> +       preg.l = _cpu_pda;              \
> +       preg.h = _cpu_pda;
> +
> +#define GET_PDA(preg, dreg)    GET_PDA_SAFE(preg)
> +
>  #endif                         /* _MEM_MAP_533_H_ */
> diff --git a/arch/blackfin/mach-bf537/include/mach/mem_map.h b/arch/blackfin/mach-bf537/include/mach/mem_map.h
> index 5078b66..be4de76 100644
> --- a/arch/blackfin/mach-bf537/include/mach/mem_map.h
> +++ b/arch/blackfin/mach-bf537/include/mach/mem_map.h
> @@ -176,4 +176,19 @@
>  #define L1_SCRATCH_START       0xFFB00000
>  #define L1_SCRATCH_LENGTH      0x1000
>
> +#define get_l1_scratch_start_cpu(cpu)          L1_SCRATCH_START
> +#define get_l1_code_start_cpu(cpu)             L1_CODE_START
> +#define get_l1_data_a_start_cpu(cpu)           L1_DATA_A_START
> +#define get_l1_data_b_start_cpu(cpu)           L1_DATA_B_START
> +#define get_l1_scratch_start()                 L1_SCRATCH_START
> +#define get_l1_code_start()                    L1_CODE_START
> +#define get_l1_data_a_start()                  L1_DATA_A_START
> +#define get_l1_data_b_start()                  L1_DATA_B_START
> +
> +#define GET_PDA_SAFE(preg)             \
> +       preg.l = _cpu_pda;              \
> +       preg.h = _cpu_pda;
> +
> +#define GET_PDA(preg, dreg)    GET_PDA_SAFE(preg)
> +
>  #endif                         /* _MEM_MAP_537_H_ */
> diff --git a/arch/blackfin/mach-bf538/include/mach/mem_map.h b/arch/blackfin/mach-bf538/include/mach/mem_map.h
> index d65d430..c134057 100644
> --- a/arch/blackfin/mach-bf538/include/mach/mem_map.h
> +++ b/arch/blackfin/mach-bf538/include/mach/mem_map.h
> @@ -104,4 +104,19 @@
>  #define L1_SCRATCH_START       0xFFB00000
>  #define L1_SCRATCH_LENGTH      0x1000
>
> +#define get_l1_scratch_start_cpu(cpu)          L1_SCRATCH_START
> +#define get_l1_code_start_cpu(cpu)             L1_CODE_START
> +#define get_l1_data_a_start_cpu(cpu)           L1_DATA_A_START
> +#define get_l1_data_b_start_cpu(cpu)           L1_DATA_B_START
> +#define get_l1_scratch_start()                 L1_SCRATCH_START
> +#define get_l1_code_start()                    L1_CODE_START
> +#define get_l1_data_a_start()                  L1_DATA_A_START
> +#define get_l1_data_b_start()                  L1_DATA_B_START
> +
> +#define GET_PDA_SAFE(preg)             \
> +       preg.l = _cpu_pda;              \
> +       preg.h = _cpu_pda;
> +
> +#define GET_PDA(preg, dreg)    GET_PDA_SAFE(preg)
> +
>  #endif                         /* _MEM_MAP_538_H_ */
> diff --git a/arch/blackfin/mach-bf548/include/mach/mem_map.h b/arch/blackfin/mach-bf548/include/mach/mem_map.h
> index a222842..361eb0e 100644
> --- a/arch/blackfin/mach-bf548/include/mach/mem_map.h
> +++ b/arch/blackfin/mach-bf548/include/mach/mem_map.h
> @@ -108,4 +108,19 @@
>  #define L1_SCRATCH_START       0xFFB00000
>  #define L1_SCRATCH_LENGTH      0x1000
>
> +#define get_l1_scratch_start_cpu(cpu)          L1_SCRATCH_START
> +#define get_l1_code_start_cpu(cpu)             L1_CODE_START
> +#define get_l1_data_a_start_cpu(cpu)           L1_DATA_A_START
> +#define get_l1_data_b_start_cpu(cpu)           L1_DATA_B_START
> +#define get_l1_scratch_start()                 L1_SCRATCH_START
> +#define get_l1_code_start()                    L1_CODE_START
> +#define get_l1_data_a_start()                  L1_DATA_A_START
> +#define get_l1_data_b_start()                  L1_DATA_B_START
> +
> +#define GET_PDA_SAFE(preg)             \
> +       preg.l = _cpu_pda;              \
> +       preg.h = _cpu_pda;
> +
> +#define GET_PDA(preg, dreg)    GET_PDA_SAFE(preg)
> +
>  #endif/* _MEM_MAP_548_H_ */
> --
> 1.5.6.3
>
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