123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2012 Regents of the University of California
- */
- #include <linux/init.h>
- #include <linux/seq_file.h>
- #include <linux/of.h>
- #include <asm/smp.h>
- /*
- * Returns the hart ID of the given device tree node, or -ENODEV if the node
- * isn't an enabled and valid RISC-V hart node.
- */
- int riscv_of_processor_hartid(struct device_node *node)
- {
- const char *isa;
- u32 hart;
- if (!of_device_is_compatible(node, "riscv")) {
- pr_warn("Found incompatible CPU\n");
- return -ENODEV;
- }
- if (of_property_read_u32(node, "reg", &hart)) {
- pr_warn("Found CPU without hart ID\n");
- return -ENODEV;
- }
- if (of_property_read_string(node, "riscv,isa", &isa)) {
- pr_warn("CPU with hartid=%d has no \"riscv,isa\" property\n", hart);
- return -ENODEV;
- }
- if (isa[0] != 'r' || isa[1] != 'v') {
- pr_warn("CPU with hartid=%d has an invalid ISA of \"%s\"\n", hart, isa);
- return -ENODEV;
- }
- return hart;
- }
- /*
- * Find hart ID of the CPU DT node under which given DT node falls.
- *
- * To achieve this, we walk up the DT tree until we find an active
- * RISC-V core (HART) node and extract the cpuid from it.
- */
- int riscv_of_parent_hartid(struct device_node *node)
- {
- for (; node; node = node->parent) {
- if (of_device_is_compatible(node, "riscv"))
- return riscv_of_processor_hartid(node);
- }
- return -1;
- }
- #ifdef CONFIG_PROC_FS
- static void print_isa(struct seq_file *f, const char *isa)
- {
- /* Print the entire ISA as it is */
- seq_puts(f, "isa\t\t: ");
- seq_write(f, isa, strlen(isa));
- seq_puts(f, "\n");
- }
- static void print_mmu(struct seq_file *f, const char *mmu_type)
- {
- #if defined(CONFIG_32BIT)
- if (strcmp(mmu_type, "riscv,sv32") != 0)
- return;
- #elif defined(CONFIG_64BIT)
- if (strcmp(mmu_type, "riscv,sv39") != 0 &&
- strcmp(mmu_type, "riscv,sv48") != 0)
- return;
- #endif
- seq_printf(f, "mmu\t\t: %s\n", mmu_type+6);
- }
- static void *c_start(struct seq_file *m, loff_t *pos)
- {
- *pos = cpumask_next(*pos - 1, cpu_online_mask);
- if ((*pos) < nr_cpu_ids)
- return (void *)(uintptr_t)(1 + *pos);
- return NULL;
- }
- static void *c_next(struct seq_file *m, void *v, loff_t *pos)
- {
- (*pos)++;
- return c_start(m, pos);
- }
- static void c_stop(struct seq_file *m, void *v)
- {
- }
- 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);
- const char *compat, *isa, *mmu;
- const char *freq, *icache, *dcache, *l2cache, *tlb, *cacheline, *vecver;
- 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 (!of_property_read_string(node, "mmu-type", &mmu))
- print_mmu(m, mmu);
- if (!of_property_read_string(node, "compatible", &compat)
- && strcmp(compat, "riscv"))
- seq_printf(m, "uarch\t\t: %s\n", compat);
- if (!of_property_read_string(node, "cpu-freq", &freq))
- seq_printf(m, "cpu-freq\t: %s\n", freq);
- if (!of_property_read_string(node, "cpu-icache", &icache))
- seq_printf(m, "cpu-icache\t: %s\n", icache);
- if (!of_property_read_string(node, "cpu-dcache", &dcache))
- seq_printf(m, "cpu-dcache\t: %s\n", dcache);
- if (!of_property_read_string(node, "cpu-l2cache", &l2cache))
- seq_printf(m, "cpu-l2cache\t: %s\n", l2cache);
- if (!of_property_read_string(node, "cpu-tlb", &tlb))
- seq_printf(m, "cpu-tlb\t\t: %s\n", tlb);
- if (!of_property_read_string(node, "cpu-cacheline", &cacheline))
- seq_printf(m, "cpu-cacheline\t: %s\n", cacheline);
- if (!of_property_read_string(node, "cpu-vector", &vecver))
- seq_printf(m, "cpu-vector\t: %s\n", vecver);
- seq_puts(m, "\n");
- of_node_put(node);
- return 0;
- }
- const struct seq_operations cpuinfo_op = {
- .start = c_start,
- .next = c_next,
- .stop = c_stop,
- .show = c_show
- };
- #endif /* CONFIG_PROC_FS */
|