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soc: Add ability for SOC to specify runtime CPU detection

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Add Kconfig SOC_HAS_RUNTIME_NUM_CPUS symbol that an SoC can
set to specify that it supports determining the number of CPUs
at runtime.

On xtensa add support for SOC_HAS_RUNTIME_NUM_CPUS and expose
soc_num_cpus that the SoC code should set early in boot as the
means to expose the number of cpus.

Signed-off-by: Kumar Gala <kumar.gala@intel.com>
This commit is contained in:
Kumar Gala 2022-10-27 08:37:15 -05:00 • committed by Anas Nashif
commit 6bdd91e9b1
2 changed files with 14 additions and 0 deletions
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8
include/zephyr/arch/xtensa/arch_inlines.h
View file

@ -50,9 +50,17 @@ static ALWAYS_INLINE uint32_t arch_proc_id(void)
return prid; return prid;
} }
#ifdef CONFIG_SOC_HAS_RUNTIME_NUM_CPUS
extern unsigned int soc_num_cpus;
#endif
static ALWAYS_INLINE unsigned int arch_num_cpus(void) static ALWAYS_INLINE unsigned int arch_num_cpus(void)
{ {
#ifdef CONFIG_SOC_HAS_RUNTIME_NUM_CPUS
return soc_num_cpus;
#else
return CONFIG_MP_MAX_NUM_CPUS; return CONFIG_MP_MAX_NUM_CPUS;
#endif
} }
#endif /* !_ASMLANGUAGE */ #endif /* !_ASMLANGUAGE */

6
soc/Kconfig
View file

@ -53,3 +53,9 @@ config SOC_HAS_TIMING_FUNCTIONS
help help
Should be selected if SoC provides custom method for retrieving Should be selected if SoC provides custom method for retrieving
timestamps and cycle count. timestamps and cycle count.
config SOC_HAS_RUNTIME_NUM_CPUS
bool
help
Should be selected if SoC handles determining the number of CPUs
at runtime.