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platform: generic: Optimize extensions_init() to parse ISA extensions once

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Instead of parsing ISA extensions separately for each hart in the
generic_extensions_init() function, it is better to parse ISA extensions
for all available harts in the cold boot path. Also, this allows us
to remove fdt_isa_bitmap from scratch space and directly initialize
"extensions" in struct sbi_hart_features for each hart.

Signed-off-by: Anup Patel <anup.patel@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260521082625.1520870-3-anup.patel@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2026-05-21 13:56:25 +05:30
committed by Anup Patel
parent a62385ab80
commit ecc92e87a9
13 changed files with 37 additions and 64 deletions
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include/sbi/sbi_platform.h
+3 -4
View File
@@ -55,7 +55,6 @@
struct sbi_domain_memregion;
struct sbi_ecall_return;
struct sbi_trap_regs;
struct sbi_hart_features;
union sbi_ldst_data;
/** Possible feature flags of a platform */
@@ -105,7 +104,7 @@ struct sbi_platform_operations {
int (*misa_get_xlen)(void);
/** Initialize (or populate) HART extensions for the platform */
int (*extensions_init)(struct sbi_hart_features *hfeatures);
int (*extensions_init)(bool cold_boot);
/** Initialize (or populate) domains for the platform */
int (*domains_init)(void);
@@ -486,10 +485,10 @@ static inline int sbi_platform_misa_xlen(const struct sbi_platform *plat)
*/
static inline int sbi_platform_extensions_init(
const struct sbi_platform *plat,
struct sbi_hart_features *hfeatures)
bool cold_boot)
{
if (plat && sbi_platform_ops(plat)->extensions_init)
return sbi_platform_ops(plat)->extensions_init(hfeatures);
return sbi_platform_ops(plat)->extensions_init(cold_boot);
return 0;
}
include/sbi_utils/fdt/fdt_helper.h
+1 -2
View File
@@ -54,8 +54,7 @@ int fdt_parse_cbom_block_size(const void *fdt, int cpu_offset, unsigned long *c
int fdt_parse_timebase_frequency(const void *fdt, unsigned long *freq);
int fdt_parse_isa_extensions(const void *fdt, unsigned int hartid,
unsigned long *extensions);
int fdt_parse_isa_extensions_all_harts(const void *fdt);
int fdt_parse_gaisler_uart_node(const void *fdt, int nodeoffset,
struct platform_uart_data *uart);