// 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_device_is_available(node)) {		pr_info("CPU with hartid=%d is not available\n", hart);		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; 	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);	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 */