linux-kernel - Re: [PATCH 20/24] RISC-V: ACPI: cpu: Enable cpuinfo for ACPI systems

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Message-ID: <Y+ViASnch0Fp1rju@spud>
Date:   Thu, 9 Feb 2023 21:13:37 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     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>,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>
Subject: Re: [PATCH 20/24] RISC-V: ACPI: cpu: Enable cpuinfo for ACPI systems

On Mon, Jan 30, 2023 at 11:52:21PM +0530, Sunil V L wrote:
> On ACPI based platforms, few details like ISA need to be read
> from the ACPI table. Enable cpuinfo on ACPI based systems.
> 
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>  arch/riscv/kernel/cpu.c | 36 +++++++++++++++++++++++++++++-------
>  1 file changed, 29 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> index 1b9a5a66e55a..bd6c0fcfe4ce 100644
> --- a/arch/riscv/kernel/cpu.c
> +++ b/arch/riscv/kernel/cpu.c
> @@ -3,6 +3,7 @@
>   * Copyright (C) 2012 Regents of the University of California
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/cpu.h>
>  #include <linux/init.h>
>  #include <linux/seq_file.h>
> @@ -256,26 +257,47 @@ static void c_stop(struct seq_file *m, void *v)
>  {
>  }
>  
> +#ifdef CONFIG_ACPI
> +void acpi_print_hart_info(struct seq_file *m,
> +			  unsigned long cpu)

Surely this fits on one line?

> +{
> +	const char *isa;
> +
> +	if (!acpi_get_riscv_isa(NULL, get_acpi_id_for_cpu(cpu), &isa))
> +		print_isa(m, isa);

Do you really need to guard this function? Aren't there nop'ed versions
of acpi_get_riscv_isa() and get_acpi_id_for_cpu() in acpi.h?

IMO, basically any use of ifdeffery you can cleanly remove from a c file
is a worthwhile change.

> +

Extra blank line here FYI.

> +}
> +#endif
> +
>  static int c_show(struct seq_file *m, void *v)
>  {
>  	unsigned long cpu_id = (unsigned long)v - 1;
> -	struct device_node *node = of_get_cpu_node(cpu_id, NULL);
>  	struct riscv_cpuinfo *ci = per_cpu_ptr(&riscv_cpuinfo, cpu_id);
> +	struct device_node *node;
>  	const char *compat, *isa;
>  
>  	seq_printf(m, "processor\t: %lu\n", cpu_id);
>  	seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
> -	if (!of_property_read_string(node, "riscv,isa", &isa))
> -		print_isa(m, isa);
> +
> +	if (acpi_disabled) {
> +		node = of_get_cpu_node(cpu_id, NULL);
> +		if (!of_property_read_string(node, "riscv,isa", &isa))
> +			print_isa(m, isa);
> +		if (!of_property_read_string(node, "compatible", &compat)
> +		    && strcmp(compat, "riscv"))
                    ^^ this should be on the line above
TBH the whole series is in need of a checkpatch --strict run IMO,
there's a bunch of coding style issues throughout.

> +			seq_printf(m, "uarch\t\t: %s\n", compat);
> +		of_node_put(node);
> +	}
> +#ifdef CONFIG_ACPI
> +	else
> +		acpi_print_hart_info(m, cpu_id);

Delete the ifdeffery here too please :)

Cheers,
Conor.

> +#endif
> +
>  	print_mmu(m);
> -	if (!of_property_read_string(node, "compatible", &compat)
> -	    && strcmp(compat, "riscv"))
> -		seq_printf(m, "uarch\t\t: %s\n", compat);
>  	seq_printf(m, "mvendorid\t: 0x%lx\n", ci->mvendorid);
>  	seq_printf(m, "marchid\t\t: 0x%lx\n", ci->marchid);
>  	seq_printf(m, "mimpid\t\t: 0x%lx\n", ci->mimpid);
>  	seq_puts(m, "\n");
> -	of_node_put(node);
>  
>  	return 0;
>  }
> -- 
> 2.38.0
>

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