{"id":16503,"date":"2024-11-18T16:01:42","date_gmt":"2024-11-18T08:01:42","guid":{"rendered":"https:\/\/fwq.ai\/blog\/16503\/"},"modified":"2024-11-18T16:01:42","modified_gmt":"2024-11-18T08:01:42","slug":"linux%e9%a9%b1%e5%8a%a8-debugfs%e6%8e%a5%e5%8f%a3%e5%88%9b%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/16503\/","title":{"rendered":"Linux\u9a71\u52a8 | debugfs\u63a5\u53e3\u521b\u5efa"},"content":{"rendered":"

\u70b9\u51fb\u4e0a\u65b9<\/span>\u201c\u5d4c\u5165\u5f0fLinux\u5145\u7535\u7ad9\u201d<\/strong><\/span>\uff0c\u9009\u62e9<\/span>\u201c\u7f6e\u9876\/\u661f\u6807\u516c\u4f17\u53f7\u201d<\/span><\/strong><\/p>\n

\u798f\u5229\u5e72\u8d27\uff0c\u7b2c\u4e00\u65f6\u95f4\u9001\u8fbe<\/span>
\n\"Linux\u9a71\u52a8 <\/p>\n

\u4e0a\u7bc7\u4ecb\u7ecd\u4e86procfs\u63a5\u53e3\u7684\u521b\u5efa\uff0c\u4eca\u5929\u518d\u4ecb\u7ecd\u4e00\u79cddebugfs\u63a5\u53e3\u7684\u521b\u5efa\u3002<\/p>\n

<\/span>\u5b9e\u73b0\u6548\u679c<\/span> <\/span> <\/h2>\n

\u5728\/sys\/kernel\/debug\/\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2aion\/test\u6587\u4ef6\uff0c\u901a\u8fc7cat\u3001echo\u7684\u65b9\u5f0f\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff1a<\/p>\n

\"Linux\u9a71\u52a8
\n\"Linux\u9a71\u52a8 <\/p>\n

<\/span>\u524d\u671f\u51c6\u5907<\/span> <\/span> <\/h2>\n

\u5185\u6838\u914d\u7f6e\u6253\u5f00debugfs\uff1a<\/p>\n

CONFIG_DEBUG_FS=y<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u6302\u8f7ddebugfs\u6587\u4ef6\u7cfb\u7edf\uff1a<\/p>\n
mount -t debugfs none \/sys\/kernel\/debug<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
 <\/span>\u4ee3\u7801\u5b9e\u73b0<\/span> <\/span> <\/h2>\n
 <\/span>\u8bfb\u5199\u53d8\u91cf\uff1a<\/span> <\/h3>\n
#include <linux>\n#include <linux>\n#include <linux>\n\nstatic struct dentry *ion_dir;\nstatic u64 test_u64 = 0;\n\nstatic int __init debugfs_init(void)\n{\n\n    \/\/\u521b\u5efa\u4e00\u4e2a\/sys\/kernel\/debug\/ion\u76ee\u5f55\n    ion_dir = debugfs_create_dir(\"ion\", NULL);\n    if (!ion_dir) {\n        printk(\"ion_dir is null\n\");\n        return -1;\n    }\n\n    \/* \u521b\u5efa\/sys\/kernel\/debug\/ion\/test_u64\u6587\u4ef6 *\/\n    debugfs_create_u64(\"test_u64\", 0644,\n                        ion_dir, &amp;test_u64);\n\n    return 0;\n}\n\nstatic void __exit debugfs_exit(void)\n{\n    debugfs_remove_recursive(ion_dir);\n}\n\nmodule_init(debugfs_init);\nmodule_exit(debugfs_exit);\nMODULE_LICENSE(\"GPL\");<\/linux><\/linux><\/linux><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
\"Linux\u9a71\u52a8  <\/p>\n
 <\/span>\u8bfb\u5199\u5b57\u7b26\u4e32\uff1a<\/span> <\/h3>\n
#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n#include <linux>\n\nstatic char ion_buf[512] = \"hello\n\";\nstatic struct dentry *ion_dir;\n\nstatic int ion_open(struct inode *inode, struct file *filp)\n{\n    \/\/printk(\"ion open\n\");\n    return 0;\n}\n\nssize_t ion_read(struct file *filp, char __user *buf, size_t count, loff_t *offp)\n{\n    int retval = 0;\n    if ((*offp + count) &gt; 512)\n        count = 512 - *offp;\n\n    if (copy_to_user(buf, ion_buf+*offp, count)) {\n        printk(\"copy to user failed, count:%ld\n\", count);\n        retval = -EFAULT;\n        goto out;\n    }\n    *offp += count;\n    retval = count;\nout:\n    return retval;\n}\n\nssize_t ion_write(struct file *filp, const char __user *buff, size_t count, loff_t *offp)\n{\n    int retval;\n\n    if (*offp &gt; 512)\n        return 0;\n\n    if (*offp + count &gt; 512)\n        count = 512 - *offp;\n\n    if (copy_from_user(ion_buf+*offp, buff, count)) {\n        printk(\"copy from user failed, count:%ld\n\", count);\n        retval = -EFAULT;\n        goto out;\n    }\n    *offp += count;\n    retval = count;\nout:\n    return retval;\n}\n\nstruct file_operations my_fops = {\n    .owner = THIS_MODULE,\n    .read = ion_read,\n    .write = ion_write,\n    .open = ion_open,\n};\n\nstatic int __init debugfs_init(void)\n{\n    printk(\"INIT MODULE\n\");\n\n    \/\/\u521b\u5efa\u4e00\u4e2a\/sys\/kernel\/debug\/ion\u76ee\u5f55\n    ion_dir = debugfs_create_dir(\"ion\", NULL);\n    if (!ion_dir) {\n        printk(\"ion_dir is null\n\");\n        return -1;\n    }\n\n    \/* \u521b\u5efa\/sys\/kernel\/debug\/ion\/test\u6587\u4ef6 *\/\n    struct dentry *filent = debugfs_create_file(\"test\", 0644, ion_dir, NULL, &amp;my_fops);\n    if (!filent) {\n        printk(\"test file is null\n\");\n        return -1;\n    }\n\n    return 0;\n}\n\nstatic void __exit debugfs_exit(void)\n{\n    debugfs_remove_recursive(ion_dir);\n}\n\nmodule_init(debugfs_init);\nmodule_exit(debugfs_exit);\nMODULE_LICENSE(\"GPL\");<\/linux><\/linux><\/linux><\/linux><\/linux><\/linux><\/linux><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
\"Linux\u9a71\u52a8  <\/p>\n
 <\/span>\u51fd\u6570\u63a5\u53e3\u8bf4\u660e<\/span> <\/span> <\/h2>\n
\u521b\u5efa\u76ee\u5f55\u3001\u6587\u4ef6\u51fd\u6570\uff1a<\/p>\n
\/* \u521b\u5efa\u76ee\u5f55 *\/\nstruct dentry *debugfs_create_dir(const char *name, struct dentry *parent);\n\n\/*\u521b\u5efa\u8282\u70b9 *\/\nstruct dentry *debugfs_create_file(const char *name, umode_t mode,\n                                   struct dentry *parent, void *data,\n                                   const struct file_operations *fops);<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
name<\/strong>\uff1a\u8981\u521b\u5efa\u7684\/sys\/kernel\/debug\u4e0b\u7684\u76ee\u5f55\u540d<\/p>\n
parent<\/strong>\uff1a\u7236\u76ee\u5f55\uff0c\u7528struct dentry\u7ed3\u6784\u4f53\u8868\u793a\u3002\u5982\u679c\u76f4\u63a5\u5728\/sys\/kernel\/debug\/\u4e0b\u521b\u5efa\u6587\u4ef6\uff0c\u5219\u4e3aNULL<\/p>\n
\u521b\u5efa\u4e0d\u540c\u5927\u5c0f\u7684\u6587\u4ef6\uff1a<\/p>\n
\/\/\u521b\u5efa\u5341\u8fdb\u5236\u7684\u65e0\u7b26\u53f7\u6587\u4ef6\nvoid debugfs_create_u8(const char *name, umode_t mode,\n                       struct dentry *parent, u8 *value);\nvoid debugfs_create_u16(const char *name, umode_t mode,\n                        struct dentry *parent, u16 *value);\nvoid debugfs_create_u32(const char *name, umode_t mode,\n                        struct dentry *parent, u32 *value);\nvoid debugfs_create_u64(const char *name, umode_t mode,\n                        struct dentry *parent, u64 *value);\n\/\/\u521b\u5efa\u5341\u516d\u8fdb\u5236\u7684\u65e0\u7b26\u53f7\u6587\u4ef6\nvoid debugfs_create_x8(const char *name, umode_t mode,\n                       struct dentry *parent, u8 *value);\nvoid debugfs_create_x16(const char *name, umode_t mode,\n                        struct dentry *parent, u16 *value);\nvoid debugfs_create_x32(const char *name, umode_t mode,\n                        struct dentry *parent, u32 *value);\nvoid debugfs_create_x64(const char *name, umode_t mode,\n                        struct dentry *parent, u64 *value);<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\n
\u66f4\u8be6\u7ec6\u7684debugfs\u7528\u6cd5\u8bf7\u53c2\u8003\u5b98\u65b9\u6587\u6863\uff1aDocumentation\/filesystems\/debugfs.txt<\/p>\n<\/blockquote>\n
\u4ee5\u4e0a\u5c31\u662fLinux\u9a71\u52a8 | debugfs\u63a5\u53e3\u521b\u5efa\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u70b9\u51fb\u4e0a\u65b9\u201c\u5d4c\u5165\u5f0fLinux\u5145\u7535\u7ad9\u201d\uff0c\u9009\u62e9\u201c\u7f6e\u9876\/\u661f\u6807\u516c\u4f17\u53f7\u201d \u798f\u5229\u5e72\u8d27\uff0c\u7b2c\u4e00\u65f6\u95f4\u9001\u8fbe \u4e0a\u7bc7\u4ecb\u7ecd\u4e86procfs\u63a5\u53e3\u7684\u521b\u5efa\uff0c\u4eca\u5929\u518d\u4ecb\u7ecd\u4e00\u79cddebugfs\u63a5\u53e3\u7684\u521b\u5efa\u3002 \u5b9e\u73b0\u6548\u679c \u5728\/sys\/kernel\/debug\/\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2aion\/test\u6587\u4ef6\uff0c\u901a\u8fc7cat\u3001echo\u7684\u65b9\u5f0f\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff1a \u524d\u671f\u51c6\u5907 \u5185\u6838\u914d\u7f6e\u6253\u5f00debugfs\uff1a CONFIG_DEBUG_FS=y \u767b\u5f55\u540e\u590d\u5236 \u6302\u8f7ddebugfs\u6587\u4ef6\u7cfb\u7edf\uff1a mount -t debugfs none \/sys\/kernel\/debug \u767b\u5f55\u540e\u590d\u5236 \u4ee3\u7801\u5b9e\u73b0 \u8bfb\u5199\u53d8\u91cf\uff1a #include <linux> #include <linux> #include <linux> static struct dentry *ion_dir; static u64 test_u64 = 0; static int __init debugfs_init(void) {     \/\/\u521b\u5efa\u4e00\u4e2a\/sys\/kernel\/debug\/ion\u76ee\u5f55     ion_dir = debugfs_create_dir(“ion”, NULL);     if (!ion_dir) {         printk(“ion_dir is null “);         return -1;     }     \/* \u521b\u5efa\/sys\/kernel\/debug\/ion\/test_u64\u6587\u4ef6 *\/     debugfs_create_u64(“test_u64”, 0644,                         ion_dir, &amp;test_u64);     return 0; } static void __exit debugfs_exit(void) {     debugfs_remove_recursive(ion_dir); } module_init(debugfs_init); module_exit(debugfs_exit); MODULE_LICENSE(“GPL”);<\/linux><\/linux><\/linux> \u767b\u5f55\u540e\u590d\u5236 \u8fd0\u884c\u7ed3\u679c\uff1a \u8bfb\u5199\u5b57\u7b26\u4e32\uff1a #include <linux> #include <linux> #include <linux> #include <linux> #include <linux> #include <linux> #include <linux> static char ion_buf[512] = “hello “; static struct dentry *ion_dir; static int ion_open(struct inode *inode, struct file *filp) { […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-16503","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/16503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=16503"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/16503\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=16503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=16503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=16503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}