[PATCH 1/1] cmd: provide command sbi

Bin Meng bmeng.cn at gmail.com
Tue Aug 18 10:57:52 CEST 2020


On Sun, Aug 16, 2020 at 9:05 PM Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> Provide a command to display information about the SBI implementation.
>
> The output might look like:
>
> => sbi
> SBI 0.2
> OpenSBI
> Extensions:
>   sbi_set_timer
>   sbi_console_putchar
>   sbi_console_getchar
>   sbi_clear_ipi
>   sbi_send_ipi
>   sbi_remote_fence_i
>   sbi_remote_sfence_vma
>   sbi_remote_sfence_vma_asid
>   sbi_shutdown
>   SBI Base Functionality
>   Timer Extension
>   IPI Extension
>   RFENCE Extension
>   Hart State Management Extension
>
> The command can be used to construct a unit test checking that the
> communication with the SEE is working.
>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> ---
>  arch/riscv/include/asm/sbi.h |  2 +
>  arch/riscv/lib/sbi.c         | 36 ++++++++++++++++
>  cmd/Kconfig                  |  6 +++
>  cmd/riscv/Makefile           |  1 +
>  cmd/riscv/sbi.c              | 80 ++++++++++++++++++++++++++++++++++++
>  5 files changed, 125 insertions(+)
>  create mode 100644 cmd/riscv/sbi.c
>
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index 08e1ac0c0e..53ca316180 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -115,6 +115,8 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
>                                 unsigned long asid);
>  #endif
>  void sbi_set_timer(uint64_t stime_value);
> +long sbi_get_spec_version(void);
> +int sbi_get_impl_id(void);
>  int sbi_probe_extension(int ext);
>
>  #endif
> diff --git a/arch/riscv/lib/sbi.c b/arch/riscv/lib/sbi.c
> index 8fbc23839d..920889ed13 100644
> --- a/arch/riscv/lib/sbi.c
> +++ b/arch/riscv/lib/sbi.c
> @@ -53,6 +53,42 @@ void sbi_set_timer(uint64_t stime_value)
>  #endif
>  }
>
> +/**
> + * sbi_get_spec_version() - get current SBI specification version
> + *
> + * Return: version id
> + */
> +long sbi_get_spec_version(void)
> +{
> +       struct sbiret ret;
> +
> +       ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_SPEC_VERSION,
> +                       0, 0, 0, 0, 0, 0);
> +       if (!ret.error)
> +               if (ret.value)
> +                       return ret.value;
> +
> +       return -ENOTSUPP;
> +}
> +
> +/**
> + * sbi_get_impl_id() - get SBI implemenation ID
> + *
> + * Return: implementation ID
> + */
> +int sbi_get_impl_id(void)
> +{
> +       struct sbiret ret;
> +
> +       ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_ID,
> +                       0, 0, 0, 0, 0, 0);
> +       if (!ret.error)
> +               if (ret.value)
> +                       return ret.value;
> +
> +       return -ENOTSUPP;
> +}
> +
>  /**
>   * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
>   * @extid: The extension ID to be probed.
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 23d7e27dc8..7a9fab51c5 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -270,6 +270,12 @@ config SPL_CMD_TLV_EEPROM
>         help
>           Read system EEPROM data block in ONIE Tlvinfo format from SPL.
>
> +config CMD_SBI
> +       bool "SBI information"

nits: keeping the prompt to be the command name seems to be the
convention for other commands in U-Boot's Kconfig files, hence "sbi"

> +       depends on RISCV_SMODE

This should depend on SBI_V02 as well. Legacy SBI does not support
probing capabilities.

> +       help
> +         Display information about the SBI implementation.
> +
>  endmenu
>
>  menu "Boot commands"
> diff --git a/cmd/riscv/Makefile b/cmd/riscv/Makefile
> index 24df023ece..1e6ac364e3 100644
> --- a/cmd/riscv/Makefile
> +++ b/cmd/riscv/Makefile
> @@ -1,3 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0+
>
>  obj-$(CONFIG_CMD_EXCEPTION) += exception.o
> +obj-$(CONFIG_CMD_SBI) += sbi.o
> diff --git a/cmd/riscv/sbi.c b/cmd/riscv/sbi.c
> new file mode 100644
> index 0000000000..559d950ffb
> --- /dev/null
> +++ b/cmd/riscv/sbi.c
> @@ -0,0 +1,80 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * The 'sbi' command displays information about the SBI implementation.
> + *
> + * Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk at gmx.de>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <asm/sbi.h>
> +
> +struct sbi_ext {
> +       const u32 id;
> +       const char *name;
> +};
> +
> +static struct sbi_ext extensions[] = {
> +       { 0x00000000, "sbi_set_timer" },
> +       { 0x00000001, "sbi_console_putchar" },
> +       { 0x00000002, "sbi_console_getchar" },
> +       { 0x00000003, "sbi_clear_ipi" },
> +       { 0x00000004, "sbi_send_ipi" },
> +       { 0x00000005, "sbi_remote_fence_i" },
> +       { 0x00000006, "sbi_remote_sfence_vma" },
> +       { 0x00000007, "sbi_remote_sfence_vma_asid" },
> +       { 0x00000008, "sbi_shutdown" },
> +       { 0x00000010, "SBI Base Functionality" },
> +       { 0x54494D45, "Timer Extension" },
> +       { 0x00735049, "IPI Extension" },
> +       { 0x52464E43, "RFENCE Extension" },
> +       { 0x0048534D, "Hart State Management Extension" },
> +};
> +
> +static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc,
> +                 char *const argv[])
> +{
> +       int i;
> +       long ret;
> +
> +       ret = sbi_get_spec_version();
> +       if (ret >= 0)
> +               printf("SBI %ld.%ld\n", ret >> 24, ret &0xffffff);
> +       ret = sbi_get_impl_id();
> +       if (ret >= 0) {
> +               switch (ret) {
> +               case 0:
> +                       printf("Berkeley Boot Loader (BBL)\n");
> +                       break;
> +               case 1:
> +                       printf("OpenSBI\n");
> +                       break;
> +               case 2:
> +                       printf("Xvisor\n");
> +                       break;
> +               case 3:
> +                       printf("KVM\n");
> +                       break;
> +               default:
> +                       printf("Unknown implementation\n");
> +                       break;
> +               }
> +       }
> +       printf("Extensions:\n");
> +       for (i = 0; i < ARRAY_SIZE(extensions); ++i) {
> +               ret = sbi_probe_extension(extensions[i].id);
> +               if (ret > 0)
> +                       printf("  %s\n", extensions[i].name);
> +       }
> +       return 0;
> +}
> +
> +#ifdef CONFIG_SYS_LONGHELP
> +static char sbi_help_text[] = "";

Nothing is displayed for LONGHELP? Or we just remove this?

> +#endif
> +
> +U_BOOT_CMD_COMPLETE(
> +       sbi, 2, 0, do_sbi,
> +       "display SBI information",
> +       sbi_help_text, NULL
> +);

Regards,
Bin


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