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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2 6/6] xen/arm: Replace call_smc with arm_smccc_smc
On Tue, 25 Sep 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>
> ---
> 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..02737e6caa 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 (int32_t)res.a0;
> }
Can't we use PSCI_RET(res) here?
Also in general, should we care about the type mismatch int32_t vs. int
which is the return type of this function?
> 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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