[PATCH v1 1/9] RISC-V: don't parse dt/acpi isa string to get rv32/rv64

Conor Dooley
2023-06-26T11:21:01Z

From: Heiko Stuebner <heiko.stuebner@vrull.eu>

When filling hwcap the kernel already expects the isa string to start with
rv32 if CONFIG_32BIT and rv64 if CONFIG_64BIT.

So when recreating the runtime isa-string we can also just go the other way
to get the correct starting point for it.

Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Co-developed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
arch/riscv/kernel/cpu.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index a2fc952318e9..742bb42e7e86 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -253,13 +253,16 @@ static void print_isa_ext(struct seq_file *f)
*/
static const char base_riscv_exts[13] = "imafdqcbkjpvh";

-static void print_isa(struct seq_file *f, const char *isa)
+static void print_isa(struct seq_file *f)
{
int i;

seq_puts(f, "isa\t\t: ");
- /* Print the rv[64/32] part */
- seq_write(f, isa, 4);
+ if (IS_ENABLED(CONFIG_32BIT))
+ seq_write(f, "rv32", 4);
+ else
+ seq_write(f, "rv64", 4);
+
for (i = 0; i < sizeof(base_riscv_exts); i++) {
if (__riscv_isa_extension_available(NULL, base_riscv_exts[i] - 'a'))
/* Print only enabled the base ISA extensions */
@@ -316,15 +319,14 @@ static int c_show(struct seq_file *m, void *v)
unsigned long cpu_id = (unsigned long)v - 1;
struct riscv_cpuinfo *ci = per_cpu_ptr(&riscv_cpuinfo, cpu_id);
struct device_node *node;
- const char *compat, *isa;
+ const char *compat;

seq_printf(m, "processor\t: %lu\n", cpu_id);
seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
+ print_isa(m);

if (acpi_disabled) {
node = of_get_cpu_node(cpu_id, NULL);
- if (!of_property_read_string(node, "riscv,isa", &isa))
- print_isa(m, isa);

print_mmu(m);
if (!of_property_read_string(node, "compatible", &compat) &&
@@ -333,8 +335,6 @@ static int c_show(struct seq_file *m, void *v)

of_node_put(node);
} else {
- if (!acpi_get_riscv_isa(NULL, cpu_id, &isa))
- print_isa(m, isa);

print_mmu(m);
}
--
2.40.1