1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Regents of the University of California
6 #include <linux/init.h>
7 #include <linux/seq_file.h>
12 * Returns the hart ID of the given device tree node, or -ENODEV if the node
13 * isn't an enabled and valid RISC-V hart node.
15 int riscv_of_processor_hartid(struct device_node *node)
20 if (!of_device_is_compatible(node, "riscv")) {
21 pr_warn("Found incompatible CPU\n");
25 if (of_property_read_u32(node, "reg", &hart)) {
26 pr_warn("Found CPU without hart ID\n");
30 if (!of_device_is_available(node)) {
31 pr_info("CPU with hartid=%d is not available\n", hart);
35 if (of_property_read_string(node, "riscv,isa", &isa)) {
36 pr_warn("CPU with hartid=%d has no \"riscv,isa\" property\n", hart);
39 if (isa[0] != 'r' || isa[1] != 'v') {
40 pr_warn("CPU with hartid=%d has an invalid ISA of \"%s\"\n", hart, isa);
48 * Find hart ID of the CPU DT node under which given DT node falls.
50 * To achieve this, we walk up the DT tree until we find an active
51 * RISC-V core (HART) node and extract the cpuid from it.
53 int riscv_of_parent_hartid(struct device_node *node)
55 for (; node; node = node->parent) {
56 if (of_device_is_compatible(node, "riscv"))
57 return riscv_of_processor_hartid(node);
65 static void print_isa(struct seq_file *f, const char *isa)
67 /* Print the entire ISA as it is */
68 seq_puts(f, "isa\t\t: ");
69 seq_write(f, isa, strlen(isa));
73 static void print_mmu(struct seq_file *f, const char *mmu_type)
75 #if defined(CONFIG_32BIT)
76 if (strcmp(mmu_type, "riscv,sv32") != 0)
78 #elif defined(CONFIG_64BIT)
79 if (strcmp(mmu_type, "riscv,sv39") != 0 &&
80 strcmp(mmu_type, "riscv,sv48") != 0)
84 seq_printf(f, "mmu\t\t: %s\n", mmu_type+6);
87 static void *c_start(struct seq_file *m, loff_t *pos)
89 *pos = cpumask_next(*pos - 1, cpu_online_mask);
90 if ((*pos) < nr_cpu_ids)
91 return (void *)(uintptr_t)(1 + *pos);
95 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
98 return c_start(m, pos);
101 static void c_stop(struct seq_file *m, void *v)
105 static int c_show(struct seq_file *m, void *v)
107 unsigned long cpu_id = (unsigned long)v - 1;
108 struct device_node *node = of_get_cpu_node(cpu_id, NULL);
109 const char *compat, *isa, *mmu;
111 seq_printf(m, "processor\t: %lu\n", cpu_id);
112 seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
113 if (!of_property_read_string(node, "riscv,isa", &isa))
115 if (!of_property_read_string(node, "mmu-type", &mmu))
117 if (!of_property_read_string(node, "compatible", &compat)
118 && strcmp(compat, "riscv"))
119 seq_printf(m, "uarch\t\t: %s\n", compat);
126 const struct seq_operations cpuinfo_op = {
133 #endif /* CONFIG_PROC_FS */