^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Architecture specific debugfs files
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2007, Intel Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Huang Ying <ying.huang@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct dentry *arch_debugfs_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) EXPORT_SYMBOL(arch_debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #ifdef CONFIG_DEBUG_BOOT_PARAMS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct setup_data_node {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) u64 paddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) u32 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) u32 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static ssize_t setup_data_read(struct file *file, char __user *user_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct setup_data_node *node = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long remain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) loff_t pos = *ppos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u64 pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (pos < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (pos >= node->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (count > node->len - pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) count = node->len - pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) pa = node->paddr + pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* Is it direct data or invalid indirect one? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (!(node->type & SETUP_INDIRECT) || node->type == SETUP_INDIRECT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) pa += sizeof(struct setup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) p = memremap(pa, count, MEMREMAP_WB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) remain = copy_to_user(user_buf, p, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) memunmap(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (remain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) *ppos = pos + count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static const struct file_operations fops_setup_data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) .read = setup_data_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) .open = simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .llseek = default_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static void __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) create_setup_data_node(struct dentry *parent, int no,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct setup_data_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct dentry *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) char buf[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) sprintf(buf, "%d", no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) d = debugfs_create_dir(buf, parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) debugfs_create_x32("type", S_IRUGO, d, &node->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static int __init create_setup_data_nodes(struct dentry *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct setup_indirect *indirect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct setup_data_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct setup_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) u64 pa_data, pa_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct dentry *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) u32 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int no = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) d = debugfs_create_dir("setup_data", parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) pa_data = boot_params.hdr.setup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) while (pa_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) node = kmalloc(sizeof(*node), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (!node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) goto err_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (!data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) kfree(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) goto err_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) pa_next = data->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (data->type == SETUP_INDIRECT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) len = sizeof(*data) + data->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) memunmap(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) data = memremap(pa_data, len, MEMREMAP_WB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (!data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) kfree(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) goto err_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) indirect = (struct setup_indirect *)data->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (indirect->type != SETUP_INDIRECT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) node->paddr = indirect->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) node->type = indirect->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) node->len = indirect->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) node->paddr = pa_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) node->type = data->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) node->len = data->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) node->paddr = pa_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) node->type = data->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) node->len = data->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) create_setup_data_node(d, no, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) pa_data = pa_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) memunmap(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) no++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) err_dir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) debugfs_remove_recursive(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct debugfs_blob_wrapper boot_params_blob = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .data = &boot_params,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .size = sizeof(boot_params),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int __init boot_params_kdebugfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct dentry *dbp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) dbp = debugfs_create_dir("boot_params", arch_debugfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) debugfs_create_x16("version", S_IRUGO, dbp, &boot_params.hdr.version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) debugfs_create_blob("data", S_IRUGO, dbp, &boot_params_blob);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) error = create_setup_data_nodes(dbp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) debugfs_remove_recursive(dbp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #endif /* CONFIG_DEBUG_BOOT_PARAMS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static int __init arch_kdebugfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) arch_debugfs_dir = debugfs_create_dir("x86", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #ifdef CONFIG_DEBUG_BOOT_PARAMS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) error = boot_params_kdebugfs_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) arch_initcall(arch_kdebugfs_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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