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Re: [Xen-devel] [[PATCH v3] 4/4] xen/arm: Replace call_smc with arm_smccc_smc



On Mon, 1 Oct 2018, Julien Grall wrote:
> call_smc is a subset of arm_smccc_smc. Rather than having 2 methods to
> do SMCCC call, replace all call to the former by the later.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

(you might want to make sure the double [[ is removed on commit.)

> ---
> 
>     Changes in v3:
>         - Use PSCI_RET where needed
> ---
>  xen/arch/arm/Makefile            |  1 -
>  xen/arch/arm/platforms/exynos5.c |  3 ++-
>  xen/arch/arm/platforms/seattle.c |  4 ++--
>  xen/arch/arm/psci.c              | 37 +++++++++++++++++++++++++------------
>  xen/arch/arm/smc.S               | 21 ---------------------
>  xen/include/asm-arm/processor.h  |  3 ---
>  6 files changed, 29 insertions(+), 40 deletions(-)
>  delete mode 100644 xen/arch/arm/smc.S
> 
> diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
> index b9b141dc84..37fa8268b3 100644
> --- a/xen/arch/arm/Makefile
> +++ b/xen/arch/arm/Makefile
> @@ -39,7 +39,6 @@ obj-y += processor.o
>  obj-y += psci.o
>  obj-y += setup.o
>  obj-y += shutdown.o
> -obj-y += smc.o
>  obj-y += smp.o
>  obj-y += smpboot.o
>  obj-y += sysctl.o
> diff --git a/xen/arch/arm/platforms/exynos5.c 
> b/xen/arch/arm/platforms/exynos5.c
> index c15ecf80f5..e2c0b7b878 100644
> --- a/xen/arch/arm/platforms/exynos5.c
> +++ b/xen/arch/arm/platforms/exynos5.c
> @@ -26,6 +26,7 @@
>  #include <asm/platforms/exynos5.h>
>  #include <asm/platform.h>
>  #include <asm/io.h>
> +#include <asm/smccc.h>
>  
>  static bool secure_firmware;
>  
> @@ -249,7 +250,7 @@ static int exynos5_cpu_up(int cpu)
>      iounmap(power);
>  
>      if ( secure_firmware )
> -        call_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
> +        arm_smccc_smc(SMC_CMD_CPU1BOOT, cpu, NULL);
>  
>      return cpu_up_send_sgi(cpu);
>  }
> diff --git a/xen/arch/arm/platforms/seattle.c 
> b/xen/arch/arm/platforms/seattle.c
> index 893cc17972..64cc1868c2 100644
> --- a/xen/arch/arm/platforms/seattle.c
> +++ b/xen/arch/arm/platforms/seattle.c
> @@ -33,12 +33,12 @@ static const char * const seattle_dt_compat[] __initconst 
> =
>   */
>  static void seattle_system_reset(void)
>  {
> -    call_smc(PSCI_0_2_FN32_SYSTEM_RESET, 0, 0, 0);
> +    arm_smccc_smc(PSCI_0_2_FN32_SYSTEM_RESET, NULL);
>  }
>  
>  static void seattle_system_off(void)
>  {
> -    call_smc(PSCI_0_2_FN32_SYSTEM_OFF, 0, 0, 0);
> +    arm_smccc_smc(PSCI_0_2_FN32_SYSTEM_OFF, NULL);
>  }
>  
>  PLATFORM_START(seattle, "SEATTLE")
> diff --git a/xen/arch/arm/psci.c b/xen/arch/arm/psci.c
> index 941eec921b..4ae6504f3e 100644
> --- a/xen/arch/arm/psci.c
> +++ b/xen/arch/arm/psci.c
> @@ -42,42 +42,53 @@ uint32_t smccc_ver;
>  
>  static uint32_t psci_cpu_on_nr;
>  
> +#define PSCI_RET(res)   ((int32_t)(res).a0)
> +
>  int call_psci_cpu_on(int cpu)
>  {
> -    return call_smc(psci_cpu_on_nr, cpu_logical_map(cpu), 
> __pa(init_secondary), 0);
> +    struct arm_smccc_res res;
> +
> +    arm_smccc_smc(psci_cpu_on_nr, cpu_logical_map(cpu), __pa(init_secondary),
> +                  &res);
> +
> +    return PSCI_RET(res.a0);
>  }
>  
>  void call_psci_cpu_off(void)
>  {
>      if ( psci_ver > PSCI_VERSION(0, 1) )
>      {
> -        int errno;
> +        struct arm_smccc_res res;
>  
>          /* If successfull the PSCI cpu_off call doesn't return */
> -        errno = call_smc(PSCI_0_2_FN32_CPU_OFF, 0, 0, 0);
> +        arm_smccc_smc(PSCI_0_2_FN32_CPU_OFF, &res);
>          panic("PSCI cpu off failed for CPU%d err=%d\n", smp_processor_id(),
> -              errno);
> +              PSCI_RET(res));
>      }
>  }
>  
>  void call_psci_system_off(void)
>  {
>      if ( psci_ver > PSCI_VERSION(0, 1) )
> -        call_smc(PSCI_0_2_FN32_SYSTEM_OFF, 0, 0, 0);
> +        arm_smccc_smc(PSCI_0_2_FN32_SYSTEM_OFF, NULL);
>  }
>  
>  void call_psci_system_reset(void)
>  {
>      if ( psci_ver > PSCI_VERSION(0, 1) )
> -        call_smc(PSCI_0_2_FN32_SYSTEM_RESET, 0, 0, 0);
> +        arm_smccc_smc(PSCI_0_2_FN32_SYSTEM_RESET, NULL);
>  }
>  
>  static int __init psci_features(uint32_t psci_func_id)
>  {
> +    struct arm_smccc_res res;
> +
>      if ( psci_ver < PSCI_VERSION(1, 0) )
>          return PSCI_NOT_SUPPORTED;
>  
> -    return call_smc(PSCI_1_0_FN32_PSCI_FEATURES, psci_func_id, 0, 0);
> +    arm_smccc_smc(PSCI_1_0_FN32_PSCI_FEATURES, psci_func_id, NULL);
> +
> +    return PSCI_RET(res);
>  }
>  
>  static int __init psci_is_smc_method(const struct dt_device_node *psci)
> @@ -112,11 +123,11 @@ static void __init psci_init_smccc(void)
>  
>      if ( psci_features(ARM_SMCCC_VERSION_FID) != PSCI_NOT_SUPPORTED )
>      {
> -        uint32_t ret;
> +        struct arm_smccc_res res;
>  
> -        ret = call_smc(ARM_SMCCC_VERSION_FID, 0, 0, 0);
> -        if ( ret != ARM_SMCCC_NOT_SUPPORTED )
> -            smccc_ver = ret;
> +        arm_smccc_smc(ARM_SMCCC_VERSION_FID, &res);
> +        if ( PSCI_RET(res) != ARM_SMCCC_NOT_SUPPORTED )
> +            smccc_ver = PSCI_RET(res);
>      }
>  
>      if ( smccc_ver >= SMCCC_VERSION(1, 1) )
> @@ -165,6 +176,7 @@ static int __init psci_init_0_2(void)
>          { /* sentinel */ },
>      };
>      int ret;
> +    struct arm_smccc_res res;
>  
>      if ( acpi_disabled )
>      {
> @@ -186,7 +198,8 @@ static int __init psci_init_0_2(void)
>          }
>      }
>  
> -    psci_ver = call_smc(PSCI_0_2_FN32_PSCI_VERSION, 0, 0, 0);
> +    arm_smccc_smc(PSCI_0_2_FN32_PSCI_VERSION, &res);
> +    psci_ver = PSCI_RET(res);
>  
>      /* For the moment, we only support PSCI 0.2 and PSCI 1.x */
>      if ( psci_ver != PSCI_VERSION(0, 2) && PSCI_VERSION_MAJOR(psci_ver) != 1 
> )
> diff --git a/xen/arch/arm/smc.S b/xen/arch/arm/smc.S
> deleted file mode 100644
> index b8f182272a..0000000000
> --- a/xen/arch/arm/smc.S
> +++ /dev/null
> @@ -1,21 +0,0 @@
> -/*
> - * xen/arch/arm/smc.S
> - *
> - * Wrapper for Secure Monitors Calls
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful,
> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> - * GNU General Public License for more details.
> - */
> -
> -#include <asm/macros.h>
> -
> -ENTRY(call_smc)
> -        smc   #0
> -        ret
> diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
> index 222a02dd99..8016cf306f 100644
> --- a/xen/include/asm-arm/processor.h
> +++ b/xen/include/asm-arm/processor.h
> @@ -812,9 +812,6 @@ void vcpu_regs_hyp_to_user(const struct vcpu *vcpu,
>  void vcpu_regs_user_to_hyp(struct vcpu *vcpu,
>                             const struct vcpu_guest_core_regs *regs);
>  
> -int call_smc(register_t function_id, register_t arg0, register_t arg1,
> -             register_t arg2);
> -
>  void do_trap_hyp_serror(struct cpu_user_regs *regs);
>  
>  void do_trap_guest_serror(struct cpu_user_regs *regs);
> -- 
> 2.11.0
> 

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