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| 1 | +// SPDX-License-Identifier: GPL-2.0 |
| 2 | +#include <linux/init.h> |
| 3 | +#include <linux/export.h> |
| 4 | +#include <linux/debugfs.h> |
| 5 | +#include <linux/kstrtox.h> |
| 6 | +#include <asm/loongarch.h> |
| 7 | + |
| 8 | +struct dentry *arch_debugfs_dir; |
| 9 | +EXPORT_SYMBOL(arch_debugfs_dir); |
| 10 | + |
| 11 | +static int sfb_state, tso_state; |
| 12 | + |
| 13 | +static void set_sfb_state(void *info) |
| 14 | +{ |
| 15 | + int val = *(int *)info << CSR_STFILL_SHIFT; |
| 16 | + |
| 17 | + csr_xchg32(val, CSR_STFILL, LOONGARCH_CSR_IMPCTL1); |
| 18 | +} |
| 19 | + |
| 20 | +static ssize_t sfb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 21 | +{ |
| 22 | + int s, state; |
| 23 | + char str[32]; |
| 24 | + |
| 25 | + state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_STFILL) >> CSR_STFILL_SHIFT; |
| 26 | + |
| 27 | + s = snprintf(str, sizeof(str), "Boot State: %x\nCurrent State: %x\n", sfb_state, state); |
| 28 | + |
| 29 | + if (*ppos >= s) |
| 30 | + return 0; |
| 31 | + |
| 32 | + s -= *ppos; |
| 33 | + s = min_t(u32, s, count); |
| 34 | + |
| 35 | + if (copy_to_user(buf, &str[*ppos], s)) |
| 36 | + return -EFAULT; |
| 37 | + |
| 38 | + *ppos += s; |
| 39 | + |
| 40 | + return s; |
| 41 | +} |
| 42 | + |
| 43 | +static ssize_t sfb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 44 | +{ |
| 45 | + int state; |
| 46 | + |
| 47 | + if (kstrtoint_from_user(buf, count, 10, &state)) |
| 48 | + return -EFAULT; |
| 49 | + |
| 50 | + switch (state) { |
| 51 | + case 0: case 1: |
| 52 | + on_each_cpu(set_sfb_state, &state, 1); |
| 53 | + break; |
| 54 | + default: |
| 55 | + return -EINVAL; |
| 56 | + } |
| 57 | + |
| 58 | + return count; |
| 59 | +} |
| 60 | + |
| 61 | +static const struct file_operations sfb_fops = { |
| 62 | + .read = sfb_read, |
| 63 | + .write = sfb_write, |
| 64 | + .open = simple_open, |
| 65 | + .llseek = default_llseek |
| 66 | +}; |
| 67 | + |
| 68 | +#define LDSTORDER_NLD_NST 0x0 /* 000 = No Load No Store */ |
| 69 | +#define LDSTORDER_ALD_NST 0x1 /* 001 = All Load No Store */ |
| 70 | +#define LDSTORDER_SLD_NST 0x3 /* 011 = Same Load No Store */ |
| 71 | +#define LDSTORDER_NLD_AST 0x4 /* 100 = No Load All Store */ |
| 72 | +#define LDSTORDER_ALD_AST 0x5 /* 101 = All Load All Store */ |
| 73 | +#define LDSTORDER_SLD_AST 0x7 /* 111 = Same Load All Store */ |
| 74 | + |
| 75 | +static char *tso_hints[] = { |
| 76 | + "No Load No Store", |
| 77 | + "All Load No Store", |
| 78 | + "Invalid Config", |
| 79 | + "Same Load No Store", |
| 80 | + "No Load All Store", |
| 81 | + "All Load All Store", |
| 82 | + "Invalid Config", |
| 83 | + "Same Load All Store" |
| 84 | +}; |
| 85 | + |
| 86 | +static void set_tso_state(void *info) |
| 87 | +{ |
| 88 | + int val = *(int *)info << CSR_LDSTORDER_SHIFT; |
| 89 | + |
| 90 | + csr_xchg32(val, CSR_LDSTORDER_MASK, LOONGARCH_CSR_IMPCTL1); |
| 91 | +} |
| 92 | + |
| 93 | +static ssize_t tso_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 94 | +{ |
| 95 | + int s, state; |
| 96 | + char str[240]; |
| 97 | + |
| 98 | + state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_LDSTORDER_MASK) >> CSR_LDSTORDER_SHIFT; |
| 99 | + |
| 100 | + s = snprintf(str, sizeof(str), "Boot State: %d (%s)\n" |
| 101 | + "Current State: %d (%s)\n\n" |
| 102 | + "Available States:\n" |
| 103 | + "0 (%s)\t" "1 (%s)\t" "3 (%s)\n" |
| 104 | + "4 (%s)\t" "5 (%s)\t" "7 (%s)\n", |
| 105 | + tso_state, tso_hints[tso_state], state, tso_hints[state], |
| 106 | + tso_hints[0], tso_hints[1], tso_hints[3], tso_hints[4], tso_hints[5], tso_hints[7]); |
| 107 | + |
| 108 | + if (*ppos >= s) |
| 109 | + return 0; |
| 110 | + |
| 111 | + s -= *ppos; |
| 112 | + s = min_t(u32, s, count); |
| 113 | + |
| 114 | + if (copy_to_user(buf, &str[*ppos], s)) |
| 115 | + return -EFAULT; |
| 116 | + |
| 117 | + *ppos += s; |
| 118 | + |
| 119 | + return s; |
| 120 | +} |
| 121 | + |
| 122 | +static ssize_t tso_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 123 | +{ |
| 124 | + int state; |
| 125 | + |
| 126 | + if (kstrtoint_from_user(buf, count, 10, &state)) |
| 127 | + return -EFAULT; |
| 128 | + |
| 129 | + switch (state) { |
| 130 | + case 0: case 1: case 3: |
| 131 | + case 4: case 5: case 7: |
| 132 | + on_each_cpu(set_tso_state, &state, 1); |
| 133 | + break; |
| 134 | + default: |
| 135 | + return -EINVAL; |
| 136 | + } |
| 137 | + |
| 138 | + return count; |
| 139 | +} |
| 140 | + |
| 141 | +static const struct file_operations tso_fops = { |
| 142 | + .read = tso_read, |
| 143 | + .write = tso_write, |
| 144 | + .open = simple_open, |
| 145 | + .llseek = default_llseek |
| 146 | +}; |
| 147 | + |
| 148 | +static int __init arch_kdebugfs_init(void) |
| 149 | +{ |
| 150 | + unsigned int config = read_cpucfg(LOONGARCH_CPUCFG3); |
| 151 | + |
| 152 | + arch_debugfs_dir = debugfs_create_dir("loongarch", NULL); |
| 153 | + |
| 154 | + if (config & CPUCFG3_SFB) { |
| 155 | + debugfs_create_file("sfb_state", S_IRUGO | S_IWUSR, |
| 156 | + arch_debugfs_dir, &sfb_state, &sfb_fops); |
| 157 | + sfb_state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_STFILL) >> CSR_STFILL_SHIFT; |
| 158 | + } |
| 159 | + |
| 160 | + if (config & (CPUCFG3_ALDORDER_CAP | CPUCFG3_ASTORDER_CAP)) { |
| 161 | + debugfs_create_file("tso_state", S_IRUGO | S_IWUSR, |
| 162 | + arch_debugfs_dir, &tso_state, &tso_fops); |
| 163 | + tso_state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_LDSTORDER_MASK) >> CSR_LDSTORDER_SHIFT; |
| 164 | + } |
| 165 | + |
| 166 | + return 0; |
| 167 | +} |
| 168 | +postcore_initcall(arch_kdebugfs_init); |
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