[PATCH V2 13/21] RISC-V: cpu: Enable cpuinfo for ACPI systems

Sunil V L
2023-02-16T18:23:07Z

On ACPI based platforms, few details like ISA need to be read
from the ACPI table. Enable cpuinfo on ACPI based systems.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
arch/riscv/kernel/cpu.c | 31 ++++++++++++++++++++++++-------
1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index 1b9a5a66e55a..a227c0661b19 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -3,10 +3,12 @@
* Copyright (C) 2012 Regents of the University of California
*/

+#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/of.h>
+#include <asm/acpi.h>
#include <asm/csr.h>
#include <asm/hwcap.h>
#include <asm/sbi.h>
@@ -256,26 +258,41 @@ static void c_stop(struct seq_file *m, void *v)
{
}

+static void acpi_print_hart_info(struct seq_file *m, unsigned long cpu)
+{
+ const char *isa;
+
+ if (!acpi_get_riscv_isa(NULL, get_acpi_id_for_cpu(cpu), &isa))
+ print_isa(m, isa);
+}
+
static int c_show(struct seq_file *m, void *v)
{
unsigned long cpu_id = (unsigned long)v - 1;
- struct device_node *node = of_get_cpu_node(cpu_id, NULL);
struct riscv_cpuinfo *ci = per_cpu_ptr(&riscv_cpuinfo, cpu_id);
+ struct device_node *node;
const char *compat, *isa;

seq_printf(m, "processor\t: %lu\n", cpu_id);
seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
- if (!of_property_read_string(node, "riscv,isa", &isa))
- print_isa(m, isa);
+
+ if (acpi_disabled) {
+ node = of_get_cpu_node(cpu_id, NULL);
+ if (!of_property_read_string(node, "riscv,isa", &isa))
+ print_isa(m, isa);
+ if (!of_property_read_string(node, "compatible", &compat) &&
+ strcmp(compat, "riscv"))
+ seq_printf(m, "uarch\t\t: %s\n", compat);
+ of_node_put(node);
+ } else {
+ acpi_print_hart_info(m, cpu_id);
+ }
+
print_mmu(m);
- if (!of_property_read_string(node, "compatible", &compat)
- && strcmp(compat, "riscv"))
- seq_printf(m, "uarch\t\t: %s\n", compat);
seq_printf(m, "mvendorid\t: 0x%lx\n", ci->mvendorid);
seq_printf(m, "marchid\t\t: 0x%lx\n", ci->marchid);
seq_printf(m, "mimpid\t\t: 0x%lx\n", ci->mimpid);
seq_puts(m, "\n");
- of_node_put(node);

return 0;
}
--
2.34.1