linux-kernel - Re: [PATCH V3 15/20] clocksource/timer-riscv: Refactor riscv_timer_init

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Message-ID: <c2c1bdb5-aee6-4f4c-9f7d-073917e75b88@spud>
Date:   Mon, 6 Mar 2023 21:01:02 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        'Conor Dooley ' <conor.dooley@...rochip.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH V3 15/20] clocksource/timer-riscv: Refactor
 riscv_timer_init_dt()

On Fri, Mar 03, 2023 at 07:06:42PM +0530, Sunil V L wrote:
> Refactor the timer init function such that few things can be
> shared by both DT and ACPI based platforms.
> 
> Co-developed-by: Anup Patel <apatel@...tanamicro.com>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  drivers/clocksource/timer-riscv.c | 81 +++++++++++++++----------------
>  1 file changed, 40 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> index 5f0f10c7e222..cecc4662293b 100644
> --- a/drivers/clocksource/timer-riscv.c
> +++ b/drivers/clocksource/timer-riscv.c
> @@ -124,61 +124,28 @@ static irqreturn_t riscv_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static int __init riscv_timer_init_dt(struct device_node *n)
> +static int __init riscv_timer_init_common(void)
>  {
> -	int cpuid, error;
> -	unsigned long hartid;
> -	struct device_node *child;
> +	int error;
>  	struct irq_domain *domain;
> +	struct fwnode_handle *intc_fwnode = riscv_get_intc_hwnode();
>  
> -	error = riscv_of_processor_hartid(n, &hartid);
> -	if (error < 0) {
> -		pr_warn("Not valid hartid for node [%pOF] error = [%lu]\n",
> -			n, hartid);
> -		return error;
> -	}
> -
> -	cpuid = riscv_hartid_to_cpuid(hartid);
> -	if (cpuid < 0) {
> -		pr_warn("Invalid cpuid for hartid [%lu]\n", hartid);
> -		return cpuid;
> -	}
> -
> -	if (cpuid != smp_processor_id())
> -		return 0;
> -
> -	child = of_find_compatible_node(NULL, NULL, "riscv,timer");
> -	if (child) {
> -		riscv_timer_cannot_wake_cpu = of_property_read_bool(child,
> -					"riscv,timer-cannot-wake-cpu");
> -		of_node_put(child);
> -	}
> -
> -	domain = NULL;
> -	child = of_get_compatible_child(n, "riscv,cpu-intc");
> -	if (!child) {
> -		pr_err("Failed to find INTC node [%pOF]\n", n);
> -		return -ENODEV;
> -	}
> -	domain = irq_find_host(child);
> -	of_node_put(child);
> +	domain = irq_find_matching_fwnode(intc_fwnode, DOMAIN_BUS_ANY);
>  	if (!domain) {
> -		pr_err("Failed to find IRQ domain for node [%pOF]\n", n);
> +		pr_err("Failed to find irq_domain for INTC node [%pfwP]\n",
> +		       intc_fwnode);
>  		return -ENODEV;
>  	}
>  
>  	riscv_clock_event_irq = irq_create_mapping(domain, RV_IRQ_TIMER);
>  	if (!riscv_clock_event_irq) {
> -		pr_err("Failed to map timer interrupt for node [%pOF]\n", n);
> +		pr_err("Failed to map timer interrupt for node [%pfwP]\n", intc_fwnode);
>  		return -ENODEV;
>  	}
>  
> -	pr_info("%s: Registering clocksource cpuid [%d] hartid [%lu]\n",
> -	       __func__, cpuid, hartid);
>  	error = clocksource_register_hz(&riscv_clocksource, riscv_timebase);
>  	if (error) {
> -		pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
> -		       error, cpuid);
> +		pr_err("RISCV timer registration failed [%d]\n", error);
>  		return error;
>  	}
>  
> @@ -207,4 +174,36 @@ static int __init riscv_timer_init_dt(struct device_node *n)
>  	return error;
>  }
>  
> +static int __init riscv_timer_init_dt(struct device_node *n)
> +{
> +	int cpuid, error;
> +	unsigned long hartid;
> +	struct device_node *child;
> +
> +	error = riscv_of_processor_hartid(n, &hartid);
> +	if (error < 0) {
> +		pr_warn("Invalid hartid for node [%pOF] error = [%lu]\n",
> +			n, hartid);

I know this was there initially, but why is this (and the one below) a
pr_warn() if we're aborting the init if we hit the condition? :thinking:

It's not your doing though, so:
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

> +		return error;
> +	}
> +
> +	cpuid = riscv_hartid_to_cpuid(hartid);
> +	if (cpuid < 0) {
> +		pr_warn("Invalid cpuid for hartid [%lu]\n", hartid);
> +		return cpuid;
> +	}
> +
> +	if (cpuid != smp_processor_id())
> +		return 0;
> +
> +	child = of_find_compatible_node(NULL, NULL, "riscv,timer");
> +	if (child) {
> +		riscv_timer_cannot_wake_cpu = of_property_read_bool(child,
> +					"riscv,timer-cannot-wake-cpu");
> +		of_node_put(child);
> +	}
> +
> +	return riscv_timer_init_common();
> +}
> +
>  TIMER_OF_DECLARE(riscv_timer, "riscv", riscv_timer_init_dt);
> -- 
> 2.34.1
> 

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