// SPDX-License-Identifier: GPL-2.0#include <linux/init.h>#include <linux/export.h>#include <linux/debugfs.h>#include <linux/kstrtox.h>#include <asm/loongarch.h> struct dentry *arch_debugfs_dir;EXPORT_SYMBOL(arch_debugfs_dir); static int sfb_state, tso_state; static void set_sfb_state(void *info){	int val = *(int *)info << CSR_STFILL_SHIFT; 	csr_xchg32(val, CSR_STFILL, LOONGARCH_CSR_IMPCTL1);} static ssize_t sfb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){	int s, state;	char str[32]; 	state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_STFILL) >> CSR_STFILL_SHIFT; 	s = snprintf(str, sizeof(str), "Boot State: %x\nCurrent State: %x\n", sfb_state, state); 	if (*ppos >= s)		return 0; 	s -= *ppos;	s = min_t(u32, s, count); 	if (copy_to_user(buf, &str[*ppos], s))		return -EFAULT; 	*ppos += s; 	return s;} static ssize_t sfb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){	int state; 	if (kstrtoint_from_user(buf, count, 10, &state))		return -EFAULT; 	switch (state) {	case 0: case 1:		on_each_cpu(set_sfb_state, &state, 1);		break;	default:		return -EINVAL;	} 	return count;} static const struct file_operations sfb_fops = {	.read = sfb_read,	.write = sfb_write,	.open = simple_open,	.llseek = default_llseek}; #define LDSTORDER_NLD_NST        0x0 /* 000 = No Load No Store */#define LDSTORDER_ALD_NST        0x1 /* 001 = All Load No Store */#define LDSTORDER_SLD_NST        0x3 /* 011 = Same Load No Store */#define LDSTORDER_NLD_AST        0x4 /* 100 = No Load All Store */#define LDSTORDER_ALD_AST        0x5 /* 101 = All Load All Store */#define LDSTORDER_SLD_AST        0x7 /* 111 = Same Load All Store */ static char *tso_hints[] = {	"No Load No Store",	"All Load No Store",	"Invalid Config",	"Same Load No Store",	"No Load All Store",	"All Load All Store",	"Invalid Config",	"Same Load All Store"}; static void set_tso_state(void *info){	int val = *(int *)info << CSR_LDSTORDER_SHIFT; 	csr_xchg32(val, CSR_LDSTORDER_MASK, LOONGARCH_CSR_IMPCTL1);} static ssize_t tso_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){	int s, state;	char str[240]; 	state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_LDSTORDER_MASK) >> CSR_LDSTORDER_SHIFT; 	s = snprintf(str, sizeof(str), "Boot State: %d (%s)\n"			               "Current State: %d (%s)\n\n"				       "Available States:\n"				       "0 (%s)\t" "1 (%s)\t" "3 (%s)\n"				       "4 (%s)\t" "5 (%s)\t" "7 (%s)\n",				       tso_state, tso_hints[tso_state], state, tso_hints[state],				       tso_hints[0], tso_hints[1], tso_hints[3], tso_hints[4], tso_hints[5], tso_hints[7]); 	if (*ppos >= s)		return 0; 	s -= *ppos;	s = min_t(u32, s, count); 	if (copy_to_user(buf, &str[*ppos], s))		return -EFAULT; 	*ppos += s; 	return s;} static ssize_t tso_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){	int state; 	if (kstrtoint_from_user(buf, count, 10, &state))		return -EFAULT; 	switch (state) {	case 0: case 1: case 3:	case 4: case 5: case 7:		on_each_cpu(set_tso_state, &state, 1);		break;	default:		return -EINVAL;	} 	return count;} static const struct file_operations tso_fops = {	.read = tso_read,	.write = tso_write,	.open = simple_open,	.llseek = default_llseek}; static int __init arch_kdebugfs_init(void){	unsigned int config = read_cpucfg(LOONGARCH_CPUCFG3); 	arch_debugfs_dir = debugfs_create_dir("loongarch", NULL); 	if (config & CPUCFG3_SFB) {		debugfs_create_file("sfb_state", S_IRUGO | S_IWUSR,			    arch_debugfs_dir, &sfb_state, &sfb_fops);		sfb_state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_STFILL) >> CSR_STFILL_SHIFT;	} 	if (config & (CPUCFG3_ALDORDER_CAP | CPUCFG3_ASTORDER_CAP)) {		debugfs_create_file("tso_state", S_IRUGO | S_IWUSR,			    arch_debugfs_dir, &tso_state, &tso_fops);		tso_state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_LDSTORDER_MASK) >> CSR_LDSTORDER_SHIFT;	} 	return 0;}postcore_initcall(arch_kdebugfs_init);