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From:   Anup Patel <anup@brainfault.org>
Date:   Mon, 9 Mar 2020 17:28:54 +0530
Message-ID: <CAAhSdy23nKn+DqVmmG+4Q4LXZ2qE8eLLUu=si9zO3y8usdA=HA@mail.gmail.com>
Subject: Re: [PATCH v4 2/5] RISC-V: Rename and move plic_find_hart_id() to
 arch directory
To:     Anup Patel <anup.patel@wdc.com>
Cc:     Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Atish Patra <atish.patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>,
        Marc Zyngier <maz@kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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Fixed Marc's email address.

On Mon, Mar 9, 2020 at 4:33 PM Anup Patel <anup.patel@wdc.com> 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@wdc.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 c34fb3ae0ff8..be05d13e30e8 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -236,20 +236,6 @@ 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 */
> @@ -328,7 +314,7 @@ 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;
> --
> 2.17.1
>