linux-kernel - Re: [PATCH v5 2/6] RISC-V: Rename and move plic_find_hart

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Message-ID: <mhng-6df8942f-32e6-4334-82c4-1721e571ab1b@palmerdabbelt-glaptop1>
Date:   Thu, 28 May 2020 18:37:19 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Anup Patel <Anup.Patel@....com>
CC:     Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        jason@...edaemon.net, Marc Zyngier <maz@...nel.org>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        anup@...infault.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Anup Patel <Anup.Patel@....com>
Subject:     Re: [PATCH v5 2/6] RISC-V: Rename and move plic_find_hart_id() to arch directory

On Thu, 21 May 2020 06:32:57 PDT (-0700), Anup Patel wrote:
> The plic_find_hart_id() can be useful to other interrupt controller
> drivers (such as RISC-V local interrupt driver) so we rename this
> function to riscv_of_parent_hartid() and place it in arch directory
> along with riscv_of_processor_hartid().
>
> Signed-off-by: Anup Patel <anup.patel@....com>
> ---
>  arch/riscv/include/asm/processor.h |  1 +
>  arch/riscv/kernel/cpu.c            | 16 ++++++++++++++++
>  drivers/irqchip/irq-sifive-plic.c  | 16 +---------------
>  3 files changed, 18 insertions(+), 15 deletions(-)
>
> diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
> index 3ddb798264f1..b1efd840003c 100644
> --- a/arch/riscv/include/asm/processor.h
> +++ b/arch/riscv/include/asm/processor.h
> @@ -75,6 +75,7 @@ static inline void wait_for_interrupt(void)
>
>  struct device_node;
>  int riscv_of_processor_hartid(struct device_node *node);
> +int riscv_of_parent_hartid(struct device_node *node);
>
>  extern void riscv_fill_hwcap(void);
>
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index 40a3c442ac5f..6d59e6906fdd 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -44,6 +44,22 @@ int riscv_of_processor_hartid(struct device_node *node)
>  	return hart;
>  }
>
> +/*
> + * Find hart ID of the CPU DT node under which given DT node falls.
> + *
> + * To achieve this, we walk up the DT tree until we find an active
> + * RISC-V core (HART) node and extract the cpuid from it.
> + */
> +int riscv_of_parent_hartid(struct device_node *node)
> +{
> +	for (; node; node = node->parent) {
> +		if (of_device_is_compatible(node, "riscv"))
> +			return riscv_of_processor_hartid(node);
> +	}
> +
> +	return -1;
> +}
> +
>  #ifdef CONFIG_PROC_FS
>
>  static void print_isa(struct seq_file *f, const char *isa)
> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> index d9c53f85a68e..16d31d114c30 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -240,20 +240,6 @@ static void plic_handle_irq(struct pt_regs *regs)
>  	csr_set(CSR_IE, IE_EIE);
>  }
>
> -/*
> - * Walk up the DT tree until we find an active RISC-V core (HART) node and
> - * extract the cpuid from it.
> - */
> -static int plic_find_hart_id(struct device_node *node)
> -{
> -	for (; node; node = node->parent) {
> -		if (of_device_is_compatible(node, "riscv"))
> -			return riscv_of_processor_hartid(node);
> -	}
> -
> -	return -1;
> -}
> -
>  static void plic_set_threshold(struct plic_handler *handler, u32 threshold)
>  {
>  	/* priority must be > threshold to trigger an interrupt */
> @@ -330,7 +316,7 @@ static int __init plic_init(struct device_node *node,
>  		if (parent.args[0] != RV_IRQ_EXT)
>  			continue;
>
> -		hartid = plic_find_hart_id(parent.np);
> +		hartid = riscv_of_parent_hartid(parent.np);
>  		if (hartid < 0) {
>  			pr_warn("failed to parse hart ID for context %d.\n", i);
>  			continue;

Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>