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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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lib/sbi/sbi_hart.c
+3 -4
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@@ -508,7 +508,7 @@ static int hart_mhpm_get_allowed_bits(void)
return num_bits;
}
static int hart_detect_features(struct sbi_scratch *scratch)
static int hart_detect_features(struct sbi_scratch *scratch, bool cold_boot)
{
struct sbi_trap_info trap = {0};
struct sbi_hart_features *hfeatures =
@@ -525,8 +525,7 @@ static int hart_detect_features(struct sbi_scratch *scratch)
* Needed to detect Smrnmi and install NMI handlers before CSR probes
* that may trigger traps.
*/
rc = sbi_platform_extensions_init(sbi_platform_thishart_ptr(),
hfeatures);
rc = sbi_platform_extensions_init(sbi_platform_ptr(scratch), cold_boot);
if (rc)
return rc;
@@ -764,7 +763,7 @@ int sbi_hart_init(struct sbi_scratch *scratch, bool cold_boot)
return SBI_ENOMEM;
}
rc = hart_detect_features(scratch);
rc = hart_detect_features(scratch, cold_boot);
if (rc)
return rc;