Subject: [PATCH v4 4/4] drivers: psci: replace psci firmware calls

From: [email-masked] (Lorenzo Pieralisi)
Date: Wed, 2 Dec 2015 18:37:29 +0000

On Wed, Dec 02, 2015 at 10:47:06AM +0100, Jens Wiklander wrote:
> Switch to use a generic interface for issuing SMC/HVC based on ARM SMC
> Calling Convention. Removes now the now unused psci-call.S.
> 
> Signed-off-by: Jens Wiklander <[email-masked]>
> Acked-by: Will Deacon <[email-masked]>
> Reviewed-by: Mark Rutland <[email-masked]>
> Tested-by: Mark Rutland <[email-masked]>
> ---
>  arch/arm/kernel/Makefile      |  1 -
>  arch/arm/kernel/psci-call.S   | 31 -------------------------------
>  arch/arm64/kernel/Makefile    |  2 +-
>  arch/arm64/kernel/psci-call.S | 28 ----------------------------
>  drivers/firmware/psci.c       | 23 +++++++++++++++++++++--
>  5 files changed, 22 insertions(+), 63 deletions(-)
>  delete mode 100644 arch/arm/kernel/psci-call.S
>  delete mode 100644 arch/arm64/kernel/psci-call.S

Thanks for implementing this patchset:

Acked-by: Lorenzo Pieralisi <[email-masked]>
Tested-by: Lorenzo Pieralisi <[email-masked]>

> 
> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> index d2d0042..80856de 100644
> --- a/arch/arm/kernel/Makefile
> +++ b/arch/arm/kernel/Makefile
> @@ -88,7 +88,6 @@ obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
>  
>  obj-$(CONFIG_ARM_VIRT_EXT)	+= hyp-stub.o
>  ifeq ($(CONFIG_ARM_PSCI),y)
> -obj-y				+= psci-call.o
>  obj-$(CONFIG_SMP)		+= psci_smp.o
>  endif
>  
> diff --git a/arch/arm/kernel/psci-call.S b/arch/arm/kernel/psci-call.S
> deleted file mode 100644
> index a78e9e1..0000000
> --- a/arch/arm/kernel/psci-call.S
> +++ /dev/null
> @@ -1,31 +0,0 @@
> -/*
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - *
> - * 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.
> - *
> - * Copyright (C) 2015 ARM Limited
> - *
> - * Author: Mark Rutland <[email-masked]>
> - */
> -
> -#include <linux/linkage.h>
> -
> -#include <asm/opcodes-sec.h>
> -#include <asm/opcodes-virt.h>
> -
> -/* int __invoke_psci_fn_hvc(u32 function_id, u32 arg0, u32 arg1, u32 arg2) */
> -ENTRY(__invoke_psci_fn_hvc)
> -	__HVC(0)
> -	bx	lr
> -ENDPROC(__invoke_psci_fn_hvc)
> -
> -/* int __invoke_psci_fn_smc(u32 function_id, u32 arg0, u32 arg1, u32 arg2) */
> -ENTRY(__invoke_psci_fn_smc)
> -	__SMC(0)
> -	bx	lr
> -ENDPROC(__invoke_psci_fn_smc)
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index 0170bea..27bf1e5 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -14,7 +14,7 @@ CFLAGS_REMOVE_return_address.o = -pg
>  arm64-obj-y		:= debug-monitors.o entry.o irq.o fpsimd.o		\
>  			   entry-fpsimd.o process.o ptrace.o setup.o signal.o	\
>  			   sys.o stacktrace.o time.o traps.o io.o vdso.o	\
> -			   hyp-stub.o psci.o psci-call.o cpu_ops.o insn.o	\
> +			   hyp-stub.o psci.o cpu_ops.o insn.o	\
>  			   return_address.o cpuinfo.o cpu_errata.o		\
>  			   cpufeature.o alternative.o cacheinfo.o		\
>  			   smp.o smp_spin_table.o topology.o smccc-call.o
> diff --git a/arch/arm64/kernel/psci-call.S b/arch/arm64/kernel/psci-call.S
> deleted file mode 100644
> index cf83e61..0000000
> --- a/arch/arm64/kernel/psci-call.S
> +++ /dev/null
> @@ -1,28 +0,0 @@
> -/*
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - *
> - * 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.
> - *
> - * Copyright (C) 2015 ARM Limited
> - *
> - * Author: Will Deacon <[email-masked]>
> - */
> -
> -#include <linux/linkage.h>
> -
> -/* int __invoke_psci_fn_hvc(u64 function_id, u64 arg0, u64 arg1, u64 arg2) */
> -ENTRY(__invoke_psci_fn_hvc)
> -	hvc	#0
> -	ret
> -ENDPROC(__invoke_psci_fn_hvc)
> -
> -/* int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1, u64 arg2) */
> -ENTRY(__invoke_psci_fn_smc)
> -	smc	#0
> -	ret
> -ENDPROC(__invoke_psci_fn_smc)
> diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
> index d24f35d..f25cd79 100644
> --- a/drivers/firmware/psci.c
> +++ b/drivers/firmware/psci.c
> @@ -13,6 +13,7 @@
>  
>  #define pr_fmt(fmt) "psci: " fmt
>  
> +#include <linux/arm-smccc.h>
>  #include <linux/errno.h>
>  #include <linux/linkage.h>
>  #include <linux/of.h>
> @@ -58,8 +59,6 @@ struct psci_operations psci_ops;
>  
>  typedef unsigned long (psci_fn)(unsigned long, unsigned long,
>  				unsigned long, unsigned long);
> -asmlinkage psci_fn __invoke_psci_fn_hvc;
> -asmlinkage psci_fn __invoke_psci_fn_smc;
>  static psci_fn *invoke_psci_fn;
>  
>  enum psci_function {
> @@ -107,6 +106,26 @@ bool psci_power_state_is_valid(u32 state)
>  	return !(state & ~valid_mask);
>  }
>  
> +static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
> +			unsigned long arg0, unsigned long arg1,
> +			unsigned long arg2)
> +{
> +	struct arm_smccc_res res;
> +
> +	arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
> +	return res.a0;
> +}
> +
> +static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
> +			unsigned long arg0, unsigned long arg1,
> +			unsigned long arg2)
> +{
> +	struct arm_smccc_res res;
> +
> +	arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
> +	return res.a0;
> +}
> +
>  static int psci_to_linux_errno(int errno)
>  {
>  	switch (errno) {
> -- 
> 1.9.1
>