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// 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);
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