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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169// 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);