[20/24] RISC-V: ACPI: cpu: Enable cpuinfo for ACPI systems

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@ventanamicro.com>
---
 arch/riscv/kernel/cpu.c | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

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@ventanamicro.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
>

On Thu, Feb 09, 2023 at 09:13:37PM +0000, Conor Dooley wrote:
> 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@ventanamicro.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?
> 
Okay

> > +{
> > +	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.
> 
You are right. Let me remove ifdef.

> > +
> 
> 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.
> 
I just moved this line as is. Sure, let me fix it. Thanks.

> > +			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 :)
> 
Okay

Thanks,
Sunil