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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
Download Patch File Download Diff File Expand all files Collapse all files
lib/utils/fdt/fdt_helper.c
+8 -39
View File
@@ -328,8 +328,6 @@ int fdt_parse_timebase_frequency(const void *fdt, unsigned long *freq)
#define RISCV_ISA_EXT_NAME_LEN_MAX 32
static unsigned long fdt_isa_bitmap_offset;
static int fdt_parse_isa_one_hart(const char *isa, unsigned long *extensions)
{
size_t i, j, isa_len;
@@ -409,15 +407,15 @@ static void fdt_parse_isa_extensions_one_hart(const char *isa,
}
}
static int fdt_parse_isa_all_harts(const void *fdt)
int fdt_parse_isa_extensions_all_harts(const void *fdt)
{
u32 hartid;
const fdt32_t *val;
unsigned long *hart_exts;
struct sbi_scratch *scratch;
struct sbi_hart_features *hfeatures;
int err, cpu_offset, cpus_offset, len;
if (!fdt || !fdt_isa_bitmap_offset)
if (!fdt)
return SBI_EINVAL;
cpus_offset = fdt_path_offset(fdt, "/cpus");
@@ -436,13 +434,14 @@ static int fdt_parse_isa_all_harts(const void *fdt)
if (!scratch)
return SBI_ENOENT;
hart_exts = sbi_scratch_offset_ptr(scratch,
fdt_isa_bitmap_offset);
hfeatures = sbi_hart_features_ptr(scratch);
if (!hfeatures)
return SBI_ENOENT;
val = fdt_getprop(fdt, cpu_offset, "riscv,isa-extensions", &len);
if (val && len > 0) {
fdt_parse_isa_extensions_one_hart((const char *)val,
hart_exts, len);
hfeatures->extensions, len);
continue;
}
@@ -450,7 +449,7 @@ static int fdt_parse_isa_all_harts(const void *fdt)
if (!val || len <= 0)
return SBI_ENOENT;
err = fdt_parse_isa_one_hart((const char *)val, hart_exts);
err = fdt_parse_isa_one_hart((const char *)val, hfeatures->extensions);
if (err)
return err;
}
@@ -458,36 +457,6 @@ static int fdt_parse_isa_all_harts(const void *fdt)
return 0;
}
int fdt_parse_isa_extensions(const void *fdt, unsigned int hartid,
unsigned long *extensions)
{
int rc, i;
unsigned long *hart_exts;
struct sbi_scratch *scratch;
if (!fdt_isa_bitmap_offset) {
fdt_isa_bitmap_offset = sbi_scratch_alloc_offset(
sizeof(*hart_exts) *
BITS_TO_LONGS(SBI_HART_EXT_MAX));
if (!fdt_isa_bitmap_offset)
return SBI_ENOMEM;
rc = fdt_parse_isa_all_harts(fdt);
if (rc)
return rc;
}
scratch = sbi_hartid_to_scratch(hartid);
if (!scratch)
return SBI_ENOENT;
hart_exts = sbi_scratch_offset_ptr(scratch, fdt_isa_bitmap_offset);
for (i = 0; i < BITS_TO_LONGS(SBI_HART_EXT_MAX); i++)
extensions[i] |= hart_exts[i];
return 0;
}
static int fdt_parse_uart_node_common(const void *fdt, int nodeoffset,
struct platform_uart_data *uart,
unsigned long default_freq,