[PATCH v5 06/17] riscv: Add vendor extensions to /proc/cpuinfo

Charlie Jenkins
2024-05-03T04:46:57Z

All of the supported vendor extensions that have been listed in
riscv_isa_vendor_ext_list can be exported through /proc/cpuinfo.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
arch/riscv/kernel/cpu.c | 35 ++++++++++++++++++++++++++++++++---
1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index d11d6320fb0d..2a7924dd809b 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -16,6 +16,7 @@
#include <asm/sbi.h>
#include <asm/smp.h>
#include <asm/pgtable.h>
+#include <asm/vendor_extensions.h>

bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
@@ -203,7 +204,33 @@ arch_initcall(riscv_cpuinfo_init);

#ifdef CONFIG_PROC_FS

-static void print_isa(struct seq_file *f, const unsigned long *isa_bitmap)
+#define ALL_CPUS -1
+
+static void print_vendor_isa(struct seq_file *f, int cpu)
+{
+ struct riscv_isavendorinfo *vendor_bitmap;
+ struct riscv_isa_vendor_ext_data_list *ext_list;
+ const struct riscv_isa_ext_data *ext_data;
+
+ for (int i = 0; i < riscv_isa_vendor_ext_list_size; i++) {
+ ext_list = riscv_isa_vendor_ext_list[i];
+ ext_data = riscv_isa_vendor_ext_list[i]->ext_data;
+
+ if (cpu == ALL_CPUS)
+ vendor_bitmap = &ext_list->all_harts_isa_bitmap;
+ else
+ vendor_bitmap = &ext_list->per_hart_isa_bitmap[cpu];
+
+ for (int j = 0; j < ext_list->ext_data_count; j++) {
+ if (!__riscv_isa_extension_available(vendor_bitmap->isa, ext_data[j].id))
+ continue;
+
+ seq_printf(f, "_%s", ext_data[j].name);
+ }
+ }
+}
+
+static void print_isa(struct seq_file *f, const unsigned long *isa_bitmap, int cpu)
{

if (IS_ENABLED(CONFIG_32BIT))
@@ -222,6 +249,8 @@ static void print_isa(struct seq_file *f, const unsigned long *isa_bitmap)
seq_printf(f, "%s", riscv_isa_ext[i].name);
}

+ print_vendor_isa(f, cpu);
+
seq_puts(f, "\n");
}

@@ -284,7 +313,7 @@ static int c_show(struct seq_file *m, void *v)
* line.
*/
seq_puts(m, "isa\t\t: ");
- print_isa(m, NULL);
+ print_isa(m, NULL, ALL_CPUS);
print_mmu(m);

if (acpi_disabled) {
@@ -306,7 +335,7 @@ static int c_show(struct seq_file *m, void *v)
* additional extensions not present across all harts.
*/
seq_puts(m, "hart isa\t: ");
- print_isa(m, hart_isa[cpu_id].isa);
+ print_isa(m, hart_isa[cpu_id].isa, cpu_id);
seq_puts(m, "\n");

return 0;

--
2.44.0