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lib: sbi: Make per-HART stack size configurable via Kconfig

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The per-HART stack size for exception/interrupt handling is currently
hardcoded to 8192 bytes in SBI_PLATFORM_DEFAULT_HART_STACK_SIZE. This
may not be sufficient for platforms with deeper call stacks (e.g. those
enabling additional SBI extensions) or may be wasteful for minimal
platforms.

Introduce a HART_STACK_SIZE Kconfig option in lib/sbi/Kconfig with a
valid range of 8192 to 1048576 bytes and a default of 8192 bytes to
preserve existing behavior. The SBI_PLATFORM_DEFAULT_HART_STACK_SIZE
macro now resolves to CONFIG_HART_STACK_SIZE, allowing all platforms
to benefit from a single configuration knob without any source changes.

Signed-off-by: Oriol Catalan <oriol.catalan@openchip.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/VI0P192MB3062735A6194BB6DA72083499E002@VI0P192MB3062.EURP192.PROD.OUTLOOK.COM
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Oriol Catalan
2026-06-16 19:09:33 +05:30
committed by Anup Patel
parent 56c39d1f08
commit d936372eab
2 changed files with 6 additions and 1 deletions
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include/sbi/sbi_platform.h
+1 -1
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@@ -164,7 +164,7 @@ struct sbi_platform_operations {
}; };
/** Platform default per-HART stack size for exception/interrupt handling */ /** Platform default per-HART stack size for exception/interrupt handling */
#define SBI_PLATFORM_DEFAULT_HART_STACK_SIZE 8192 #define SBI_PLATFORM_DEFAULT_HART_STACK_SIZE CONFIG_DEFAULT_HART_STACK_SIZE
/** Platform default heap size */ /** Platform default heap size */
#define SBI_PLATFORM_DEFAULT_HEAP_SIZE(__num_hart) \ #define SBI_PLATFORM_DEFAULT_HEAP_SIZE(__num_hart) \
lib/sbi/Kconfig
+5
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@@ -2,6 +2,11 @@
menu "Generic SBI Support" menu "Generic SBI Support"
config DEFAULT_HART_STACK_SIZE
int "Default per-HART stack size (bytes)"
range 8192 1048576
default 8192
config CONSOLE_EARLY_BUFFER_SIZE config CONSOLE_EARLY_BUFFER_SIZE
int "Early console buffer size (bytes)" int "Early console buffer size (bytes)"
default 256 default 256