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[14/24] RISC-V: ACPI: smpboot: Add function to retrieve the hartid

Message ID 20230130182225.2471414-15-sunilvl@ventanamicro.com
State New
Headers
Series Add basic ACPI support for RISC-V |

Commit Message

Sunil V L Jan. 30, 2023, 6:22 p.m. UTC 
  hartid is in RINTC structuire in MADT table. Instead of parsing
the ACPI table every time we need for a cpu, cache it and provide
a function to read it.

This is similar to acpi_get_madt_gicc() in arm64.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 arch/riscv/include/asm/acpi.h | 14 +++++++++++++-
 arch/riscv/kernel/smpboot.c   | 21 +++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

Comments

Conor Dooley Feb. 9, 2023, 8:30 p.m. UTC | #1 
Hey Sunil, Drew,

@drew, a question below that I'm sorta aiming at you...

On Mon, Jan 30, 2023 at 11:52:15PM +0530, Sunil V L wrote:
> hartid is in RINTC structuire in MADT table. Instead of parsing

Nit: missing articles before RINTC and MADT. Also typo "structure".

Perhaps you'd benefit from a spell checker in your git editor.

> the ACPI table every time we need for a cpu, cache it and provide
> a function to read it.
> 
> This is similar to acpi_get_madt_gicc() in arm64.

-ENOTFOUND, do you mean acpi_cpu_get_madt_gicc()?

> 
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> ---
>  arch/riscv/include/asm/acpi.h | 14 +++++++++++++-
>  arch/riscv/kernel/smpboot.c   | 21 +++++++++++++++++++++
>  2 files changed, 34 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h
> index d1f1e53ec657..69a880b7257a 100644
> --- a/arch/riscv/include/asm/acpi.h
> +++ b/arch/riscv/include/asm/acpi.h
> @@ -65,6 +65,18 @@ int acpi_numa_get_nid(unsigned int cpu);
>  static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; }
>  #endif /* CONFIG_ACPI_NUMA */
>  
> -#endif
> +struct acpi_madt_rintc *acpi_get_madt_rintc(int cpu);
> +struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu);
> +static inline u32 get_acpi_id_for_cpu(int cpu)
> +{
> +	return	acpi_cpu_get_madt_rintc(cpu)->uid;
> +}
> +#else
> +static inline u32 get_acpi_id_for_cpu(int cpu)
> +{
> +	return -1;
> +}
> +
> +#endif /* CONFIG_ACPI */
>  
>  #endif /*_ASM_ACPI_H*/
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index e48cf88d0bc1..3a8b7a9eb5ac 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -73,6 +73,25 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
>  
>  #ifdef CONFIG_ACPI
>  static unsigned int cpu_count = 1;
> +static unsigned int intc_count;
> +static struct acpi_madt_rintc cpu_madt_rintc[NR_CPUS];
> +
> +struct acpi_madt_rintc *acpi_get_madt_rintc(int cpu)
> +{
> +	return &cpu_madt_rintc[cpu];
> +}
> +
> +struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu)
> +{
> +	int i;

Since we are C11 now, you don't even need to declare this outside of the
loop, right?

> +
> +	for (i = 0; i < NR_CPUS; i++) {

@drew, perhaps you know since you were fiddling not too long ago with
cpumask stuff - at what point does for_each_possible_cpu() become
usable?
I had a bit of a poke & couldn't immediately tell if it'd be okay to use
it here.

> +		if (riscv_hartid_to_cpuid(cpu_madt_rintc[i].hart_id) == cpu)
> +			return &cpu_madt_rintc[i];
> +	}
> +	return NULL;

Another nit: newline before return please :)

> +}
> +EXPORT_SYMBOL_GPL(acpi_cpu_get_madt_rintc);
>  
>  static int __init
>  acpi_parse_rintc(union acpi_subtable_headers *header,
> @@ -92,6 +111,8 @@ acpi_parse_rintc(union acpi_subtable_headers *header,
>  	hart = processor->hart_id;
>  	if (hart < 0)
>  		return 0;
> +
> +	cpu_madt_rintc[intc_count++] = *processor;
>  	if (hart == cpuid_to_hartid_map(0)) {
>  		BUG_ON(found_boot_cpu);
>  		found_boot_cpu = 1;
> -- 
> 2.38.0
>
Sunil V L Feb. 13, 2023, 5 p.m. UTC | #2 
On Thu, Feb 09, 2023 at 08:30:40PM +0000, Conor Dooley wrote:
> Hey Sunil, Drew,
> 
> @drew, a question below that I'm sorta aiming at you...
> 
> On Mon, Jan 30, 2023 at 11:52:15PM +0530, Sunil V L wrote:
> > hartid is in RINTC structuire in MADT table. Instead of parsing
> 
> Nit: missing articles before RINTC and MADT. Also typo "structure".
> 
> Perhaps you'd benefit from a spell checker in your git editor.
> 
Okay.

> > the ACPI table every time we need for a cpu, cache it and provide
> > a function to read it.
> > 
> > This is similar to acpi_get_madt_gicc() in arm64.
> 
> -ENOTFOUND, do you mean acpi_cpu_get_madt_gicc()?
>
Yes. Will update.

> > 
> > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> > ---
> >  arch/riscv/include/asm/acpi.h | 14 +++++++++++++-
> >  arch/riscv/kernel/smpboot.c   | 21 +++++++++++++++++++++
> >  2 files changed, 34 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h
> > index d1f1e53ec657..69a880b7257a 100644
> > --- a/arch/riscv/include/asm/acpi.h
> > +++ b/arch/riscv/include/asm/acpi.h
> > @@ -65,6 +65,18 @@ int acpi_numa_get_nid(unsigned int cpu);
> >  static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; }
> >  #endif /* CONFIG_ACPI_NUMA */
> >  
> > -#endif
> > +struct acpi_madt_rintc *acpi_get_madt_rintc(int cpu);
> > +struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu);
> > +static inline u32 get_acpi_id_for_cpu(int cpu)
> > +{
> > +	return	acpi_cpu_get_madt_rintc(cpu)->uid;
> > +}
> > +#else
> > +static inline u32 get_acpi_id_for_cpu(int cpu)
> > +{
> > +	return -1;
> > +}
> > +
> > +#endif /* CONFIG_ACPI */
> >  
> >  #endif /*_ASM_ACPI_H*/
> > diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> > index e48cf88d0bc1..3a8b7a9eb5ac 100644
> > --- a/arch/riscv/kernel/smpboot.c
> > +++ b/arch/riscv/kernel/smpboot.c
> > @@ -73,6 +73,25 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
> >  
> >  #ifdef CONFIG_ACPI
> >  static unsigned int cpu_count = 1;
> > +static unsigned int intc_count;
> > +static struct acpi_madt_rintc cpu_madt_rintc[NR_CPUS];
> > +
> > +struct acpi_madt_rintc *acpi_get_madt_rintc(int cpu)
> > +{
> > +	return &cpu_madt_rintc[cpu];
> > +}
> > +
> > +struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu)
> > +{
> > +	int i;
> 
> Since we are C11 now, you don't even need to declare this outside of the
> loop, right?
>
Okay.
 
> > +
> > +	for (i = 0; i < NR_CPUS; i++) {
> 
> @drew, perhaps you know since you were fiddling not too long ago with
> cpumask stuff - at what point does for_each_possible_cpu() become
> usable?
> I had a bit of a poke & couldn't immediately tell if it'd be okay to use
> it here.
>
It should be possible. Thanks!
 
> > +		if (riscv_hartid_to_cpuid(cpu_madt_rintc[i].hart_id) == cpu)
> > +			return &cpu_madt_rintc[i];
> > +	}
> > +	return NULL;
> 
> Another nit: newline before return please :)
>
Sure.

Thanks,
Sunil
diff mbox series

Patch

diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h
index d1f1e53ec657..69a880b7257a 100644
--- a/arch/riscv/include/asm/acpi.h
+++ b/arch/riscv/include/asm/acpi.h
@@ -65,6 +65,18 @@  int acpi_numa_get_nid(unsigned int cpu);
 static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; }
 #endif /* CONFIG_ACPI_NUMA */
 
-#endif
+struct acpi_madt_rintc *acpi_get_madt_rintc(int cpu);
+struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu);
+static inline u32 get_acpi_id_for_cpu(int cpu)
+{
+	return	acpi_cpu_get_madt_rintc(cpu)->uid;
+}
+#else
+static inline u32 get_acpi_id_for_cpu(int cpu)
+{
+	return -1;
+}
+
+#endif /* CONFIG_ACPI */
 
 #endif /*_ASM_ACPI_H*/
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index e48cf88d0bc1..3a8b7a9eb5ac 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -73,6 +73,25 @@  void __init smp_prepare_cpus(unsigned int max_cpus)
 
 #ifdef CONFIG_ACPI
 static unsigned int cpu_count = 1;
+static unsigned int intc_count;
+static struct acpi_madt_rintc cpu_madt_rintc[NR_CPUS];
+
+struct acpi_madt_rintc *acpi_get_madt_rintc(int cpu)
+{
+	return &cpu_madt_rintc[cpu];
+}
+
+struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu)
+{
+	int i;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		if (riscv_hartid_to_cpuid(cpu_madt_rintc[i].hart_id) == cpu)
+			return &cpu_madt_rintc[i];
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_cpu_get_madt_rintc);
 
 static int __init
 acpi_parse_rintc(union acpi_subtable_headers *header,
@@ -92,6 +111,8 @@  acpi_parse_rintc(union acpi_subtable_headers *header,
 	hart = processor->hart_id;
 	if (hart < 0)
 		return 0;
+
+	cpu_madt_rintc[intc_count++] = *processor;
 	if (hart == cpuid_to_hartid_map(0)) {
 		BUG_ON(found_boot_cpu);
 		found_boot_cpu = 1;