linux-kernel - Re: [PATCH 10/11] irqchip: add a SiFive PLIC driver

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Date:   Fri, 3 Aug 2018 14:29:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Atish Patra <atish.patra@....com>
Cc:     Christoph Hellwig <hch@....de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "marc.zyngier@....com" <marc.zyngier@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "anup@...infault.org" <anup@...infault.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "shorne@...il.com" <shorne@...il.com>
Subject: Re: [PATCH 10/11] irqchip: add a SiFive PLIC driver

On Thu, Aug 02, 2018 at 04:13:26PM -0700, Atish Patra wrote:
>> + * which device 0 is defined as non-existant by the RISC-V Priviledged Spec.
> /s/existant/existent
>
> /s/Priviledged/Privileged
>> + * Each hart context has a vector of interupt enable bits associated with it.
> /s/interupt/interrupt

All fixed.

>> +	WARN_ON_ONCE(!handler->present);
>> +
>> +	csr_clear(sie, SIE_STIE);
>
> We should clear the SIE_SEIE not SIE_STIE. Correct ?

Yes, fixed.

>> +	if (plic_regs) {
>> +		pr_warning("PLIC already present.\n");
>
> Got a check-patch warning.
>
> WARNING: Prefer pr_warn(... to pr_warning(...
> #257: FILE: drivers/irqchip/irq-sifive-plic.c:191:
> +               pr_warning("PLIC already present.\n");

Fixed.

>> +
>> +		if (of_irq_parse_one(node, i, &parent)) {
>> +			pr_err("failed to parse parent for contxt %d.\n", i);
> /s/contxt/context

Fixed.

>> +			continue;
>> +		}
>> +
>> +		/* skip context holes */
>> +		if (parent.args[0] == -1)
>> +			continue;
>> +
>> +		cpu = plic_find_hart_id(parent.np->parent);
>
> Since plic_find_hart_id() is going to walk up the DT, we can pass only 
> parent.np instead of parent.np->parent. It does not increase any efficiency 
> either way. So not very necessary. Just thought of taking the advantage of 
> plic_find_hart_id.

Yeah, I'll update this.

Thanks for the review!