diff mbox series

[V3,10/20] RISC-V: smpboot: Add ACPI support in smp_setup()

Message ID 20230303133647.845095-11-sunilvl@ventanamicro.com
State New
Headers
Series Add basic ACPI support for RISC-V |

Commit Message

Sunil V L March 3, 2023, 1:36 p.m. UTC 
  Enable SMP boot on ACPI based platforms by using the RINTC
structures in the MADT table.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
 arch/riscv/kernel/smpboot.c | 72 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 71 insertions(+), 1 deletion(-)

Comments

Andrew Jones March 3, 2023, 3:49 p.m. UTC | #1 
On Fri, Mar 03, 2023 at 07:06:37PM +0530, Sunil V L wrote:
> Enable SMP boot on ACPI based platforms by using the RINTC
> structures in the MADT table.
> 
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> ---
>  arch/riscv/kernel/smpboot.c | 72 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 71 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index 26214ddefaa4..27047322d3bb 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -8,6 +8,7 @@
>   * Copyright (C) 2017 SiFive
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/arch_topology.h>
>  #include <linux/module.h>
>  #include <linux/init.h>
> @@ -70,6 +71,72 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
>  	}
>  }
>  
> +#ifdef CONFIG_ACPI
> +static unsigned int cpu_count = 1;
> +
> +static int __init acpi_parse_rintc(union acpi_subtable_headers *header, const unsigned long end)
> +{
> +	unsigned long hart;
> +	static bool found_boot_cpu;
> +	struct acpi_madt_rintc *processor = (struct acpi_madt_rintc *)header;
> +
> +	/*
> +	 * Each RINTC structure in MADT will have a flag. If ACPI_MADT_ENABLED
> +	 * bit in the flag is not enabled, it means OS should not try to enable
> +	 * the cpu to which RINTC belongs.
> +	 */
> +	if (!(processor->flags & ACPI_MADT_ENABLED))
> +		return 0;
> +
> +	if (BAD_MADT_ENTRY(processor, end))
> +		return -EINVAL;
> +
> +	acpi_table_print_madt_entry(&header->common);
> +
> +	hart = processor->hart_id;
> +	if (hart == INVALID_HARTID) {
> +		pr_warn("Invalid hartid\n");
> +		return 0;
> +	}
> +
> +	if (hart == cpuid_to_hartid_map(0)) {
> +		BUG_ON(found_boot_cpu);
> +		found_boot_cpu = true;
> +		early_map_cpu_to_node(0, NUMA_NO_NODE);

We should have kept

 static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; }

and only dropped the

 #ifdef CONFIG_ACPI_NUMA
 int acpi_numa_get_nid(unsigned int cpu);
 #else
 ...
 #endif

> +		return 0;
> +	}
> +
> +	if (cpu_count >= NR_CPUS) {
> +		pr_warn("NR_CPUS is too small for the number of ACPI tables.\n");
> +		return 0;
> +	}
> +
> +	cpuid_to_hartid_map(cpu_count) = hart;
> +	early_map_cpu_to_node(cpu_count, NUMA_NO_NODE);
> +	cpu_count++;
> +
> +	return 0;
> +}
> +
> +static void __init acpi_parse_and_init_cpus(void)
> +{
> +	int cpuid;
> +
> +	cpu_set_ops(0);
> +
> +	acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_rintc, 0);
> +
> +	for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
> +		if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) {
> +			cpu_set_ops(cpuid);
> +			set_cpu_possible(cpuid, true);
> +		}
> +	}
> +}
> +#else
> +#define acpi_parse_and_init_cpus(...)	do { } while (0)
> +#endif
> +
>  static void __init of_parse_and_init_cpus(void)
>  {
>  	struct device_node *dn;
> @@ -118,7 +185,10 @@ static void __init of_parse_and_init_cpus(void)
>  
>  void __init setup_smp(void)
>  {
> -	of_parse_and_init_cpus();
> +	if (acpi_disabled)
> +		of_parse_and_init_cpus();
> +	else
> +		acpi_parse_and_init_cpus();
>  }
>  
>  static int start_secondary_cpu(int cpu, struct task_struct *tidle)
> -- 
> 2.34.1
>

Thanks,
drew
Sunil V L March 3, 2023, 5:54 p.m. UTC | #2 
On Fri, Mar 03, 2023 at 04:49:20PM +0100, Andrew Jones wrote:
> On Fri, Mar 03, 2023 at 07:06:37PM +0530, Sunil V L wrote:
> > Enable SMP boot on ACPI based platforms by using the RINTC
> > structures in the MADT table.
> > 
> > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > ---
> >  arch/riscv/kernel/smpboot.c | 72 ++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 71 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> > index 26214ddefaa4..27047322d3bb 100644
> > --- a/arch/riscv/kernel/smpboot.c
> > +++ b/arch/riscv/kernel/smpboot.c
> > @@ -8,6 +8,7 @@
> >   * Copyright (C) 2017 SiFive
> >   */
> >  
> > +#include <linux/acpi.h>
> >  #include <linux/arch_topology.h>
> >  #include <linux/module.h>
> >  #include <linux/init.h>
> > @@ -70,6 +71,72 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
> >  	}
> >  }
> >  
> > +#ifdef CONFIG_ACPI
> > +static unsigned int cpu_count = 1;
> > +
> > +static int __init acpi_parse_rintc(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > +	unsigned long hart;
> > +	static bool found_boot_cpu;
> > +	struct acpi_madt_rintc *processor = (struct acpi_madt_rintc *)header;
> > +
> > +	/*
> > +	 * Each RINTC structure in MADT will have a flag. If ACPI_MADT_ENABLED
> > +	 * bit in the flag is not enabled, it means OS should not try to enable
> > +	 * the cpu to which RINTC belongs.
> > +	 */
> > +	if (!(processor->flags & ACPI_MADT_ENABLED))
> > +		return 0;
> > +
> > +	if (BAD_MADT_ENTRY(processor, end))
> > +		return -EINVAL;
> > +
> > +	acpi_table_print_madt_entry(&header->common);
> > +
> > +	hart = processor->hart_id;
> > +	if (hart == INVALID_HARTID) {
> > +		pr_warn("Invalid hartid\n");
> > +		return 0;
> > +	}
> > +
> > +	if (hart == cpuid_to_hartid_map(0)) {
> > +		BUG_ON(found_boot_cpu);
> > +		found_boot_cpu = true;
> > +		early_map_cpu_to_node(0, NUMA_NO_NODE);
> 
> We should have kept
> 
>  static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; }
> 
> and only dropped the
> 
>  #ifdef CONFIG_ACPI_NUMA
>  int acpi_numa_get_nid(unsigned int cpu);
>  #else
>  ...
>  #endif
> 
Okay, I thought we better add it when we enable NUMA with ACPI. 

> > +		return 0;
> > +	}
> > +
> > +	if (cpu_count >= NR_CPUS) {
> > +		pr_warn("NR_CPUS is too small for the number of ACPI tables.\n");
> > +		return 0;
> > +	}
> > +
> > +	cpuid_to_hartid_map(cpu_count) = hart;
> > +	early_map_cpu_to_node(cpu_count, NUMA_NO_NODE);
> > +	cpu_count++;
> > +
> > +	return 0;
> > +}
> > +
> > +static void __init acpi_parse_and_init_cpus(void)
> > +{
> > +	int cpuid;
> > +
> > +	cpu_set_ops(0);
> > +
> > +	acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_rintc, 0);
> > +
> > +	for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
> > +		if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) {
> > +			cpu_set_ops(cpuid);
> > +			set_cpu_possible(cpuid, true);
> > +		}
> > +	}
> > +}
> > +#else
> > +#define acpi_parse_and_init_cpus(...)	do { } while (0)
> > +#endif
> > +
> >  static void __init of_parse_and_init_cpus(void)
> >  {
> >  	struct device_node *dn;
> > @@ -118,7 +185,10 @@ static void __init of_parse_and_init_cpus(void)
> >  
> >  void __init setup_smp(void)
> >  {
> > -	of_parse_and_init_cpus();
> > +	if (acpi_disabled)
> > +		of_parse_and_init_cpus();
> > +	else
> > +		acpi_parse_and_init_cpus();
> >  }
> >  
> >  static int start_secondary_cpu(int cpu, struct task_struct *tidle)
> > -- 
> > 2.34.1
> >
> 
> Thanks,
> drew
diff mbox series

Patch

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 26214ddefaa4..27047322d3bb 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -8,6 +8,7 @@ 
  * Copyright (C) 2017 SiFive
  */
 
+#include <linux/acpi.h>
 #include <linux/arch_topology.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -70,6 +71,72 @@  void __init smp_prepare_cpus(unsigned int max_cpus)
 	}
 }
 
+#ifdef CONFIG_ACPI
+static unsigned int cpu_count = 1;
+
+static int __init acpi_parse_rintc(union acpi_subtable_headers *header, const unsigned long end)
+{
+	unsigned long hart;
+	static bool found_boot_cpu;
+	struct acpi_madt_rintc *processor = (struct acpi_madt_rintc *)header;
+
+	/*
+	 * Each RINTC structure in MADT will have a flag. If ACPI_MADT_ENABLED
+	 * bit in the flag is not enabled, it means OS should not try to enable
+	 * the cpu to which RINTC belongs.
+	 */
+	if (!(processor->flags & ACPI_MADT_ENABLED))
+		return 0;
+
+	if (BAD_MADT_ENTRY(processor, end))
+		return -EINVAL;
+
+	acpi_table_print_madt_entry(&header->common);
+
+	hart = processor->hart_id;
+	if (hart == INVALID_HARTID) {
+		pr_warn("Invalid hartid\n");
+		return 0;
+	}
+
+	if (hart == cpuid_to_hartid_map(0)) {
+		BUG_ON(found_boot_cpu);
+		found_boot_cpu = true;
+		early_map_cpu_to_node(0, NUMA_NO_NODE);
+		return 0;
+	}
+
+	if (cpu_count >= NR_CPUS) {
+		pr_warn("NR_CPUS is too small for the number of ACPI tables.\n");
+		return 0;
+	}
+
+	cpuid_to_hartid_map(cpu_count) = hart;
+	early_map_cpu_to_node(cpu_count, NUMA_NO_NODE);
+	cpu_count++;
+
+	return 0;
+}
+
+static void __init acpi_parse_and_init_cpus(void)
+{
+	int cpuid;
+
+	cpu_set_ops(0);
+
+	acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_rintc, 0);
+
+	for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
+		if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) {
+			cpu_set_ops(cpuid);
+			set_cpu_possible(cpuid, true);
+		}
+	}
+}
+#else
+#define acpi_parse_and_init_cpus(...)	do { } while (0)
+#endif
+
 static void __init of_parse_and_init_cpus(void)
 {
 	struct device_node *dn;
@@ -118,7 +185,10 @@  static void __init of_parse_and_init_cpus(void)
 
 void __init setup_smp(void)
 {
-	of_parse_and_init_cpus();
+	if (acpi_disabled)
+		of_parse_and_init_cpus();
+	else
+		acpi_parse_and_init_cpus();
 }
 
 static int start_secondary_cpu(int cpu, struct task_struct *tidle)