x86, boot: export linked list of struct setup_data via debugfs
Export linked list of struct setup_data via debugfs.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c
index 7335430..c032059 100644
--- a/arch/x86/kernel/kdebugfs.c
+++ b/arch/x86/kernel/kdebugfs.c
@@ -6,23 +6,171 @@
*
* This file is released under the GPLv2.
*/
-
#include <linux/debugfs.h>
+#include <linux/uaccess.h>
#include <linux/stat.h>
#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/mm.h>
#include <asm/setup.h>
#ifdef CONFIG_DEBUG_BOOT_PARAMS
+struct setup_data_node {
+ u64 paddr;
+ u32 type;
+ u32 len;
+};
+
+static ssize_t
+setup_data_read(struct file *file, char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ struct setup_data_node *node = file->private_data;
+ unsigned long remain;
+ loff_t pos = *ppos;
+ struct page *pg;
+ void *p;
+ u64 pa;
+
+ if (pos < 0)
+ return -EINVAL;
+ if (pos >= node->len)
+ return 0;
+
+ if (count > node->len - pos)
+ count = node->len - pos;
+ pa = node->paddr + sizeof(struct setup_data) + pos;
+ pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT);
+ if (PageHighMem(pg)) {
+ p = ioremap_cache(pa, count);
+ if (!p)
+ return -ENXIO;
+ } else {
+ p = __va(pa);
+ }
+
+ remain = copy_to_user(user_buf, p, count);
+
+ if (PageHighMem(pg))
+ iounmap(p);
+
+ if (remain)
+ return -EFAULT;
+
+ *ppos = pos + count;
+
+ return count;
+}
+
+static int setup_data_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static const struct file_operations fops_setup_data = {
+ .read = setup_data_read,
+ .open = setup_data_open,
+};
+
+static int __init
+create_setup_data_node(struct dentry *parent, int no,
+ struct setup_data_node *node)
+{
+ struct dentry *d, *type, *data;
+ char buf[16];
+ int error;
+
+ sprintf(buf, "%d", no);
+ d = debugfs_create_dir(buf, parent);
+ if (!d) {
+ error = -ENOMEM;
+ goto err_return;
+ }
+ type = debugfs_create_x32("type", S_IRUGO, d, &node->type);
+ if (!type) {
+ error = -ENOMEM;
+ goto err_dir;
+ }
+ data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
+ if (!data) {
+ error = -ENOMEM;
+ goto err_type;
+ }
+ return 0;
+
+err_type:
+ debugfs_remove(type);
+err_dir:
+ debugfs_remove(d);
+err_return:
+ return error;
+}
+
+static int __init create_setup_data_nodes(struct dentry *parent)
+{
+ struct setup_data_node *node;
+ struct setup_data *data;
+ int error, no = 0;
+ struct dentry *d;
+ struct page *pg;
+ u64 pa_data;
+
+ d = debugfs_create_dir("setup_data", parent);
+ if (!d) {
+ error = -ENOMEM;
+ goto err_return;
+ }
+
+ pa_data = boot_params.hdr.setup_data;
+
+ while (pa_data) {
+ node = kmalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ error = -ENOMEM;
+ goto err_dir;
+ }
+ pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT);
+ if (PageHighMem(pg)) {
+ data = ioremap_cache(pa_data, sizeof(*data));
+ if (!data) {
+ error = -ENXIO;
+ goto err_dir;
+ }
+ } else {
+ data = __va(pa_data);
+ }
+
+ node->paddr = pa_data;
+ node->type = data->type;
+ node->len = data->len;
+ error = create_setup_data_node(d, no, node);
+ pa_data = data->next;
+
+ if (PageHighMem(pg))
+ iounmap(data);
+ if (error)
+ goto err_dir;
+ no++;
+ }
+ return 0;
+
+err_dir:
+ debugfs_remove(d);
+err_return:
+ return error;
+}
+
static struct debugfs_blob_wrapper boot_params_blob = {
- .data = &boot_params,
- .size = sizeof(boot_params),
+ .data = &boot_params,
+ .size = sizeof(boot_params),
};
static int __init boot_params_kdebugfs_init(void)
{
- int error;
struct dentry *dbp, *version, *data;
+ int error;
dbp = debugfs_create_dir("boot_params", NULL);
if (!dbp) {
@@ -41,7 +189,13 @@
error = -ENOMEM;
goto err_version;
}
+ error = create_setup_data_nodes(dbp);
+ if (error)
+ goto err_data;
return 0;
+
+err_data:
+ debugfs_remove(data);
err_version:
debugfs_remove(version);
err_dir:
@@ -61,5 +215,4 @@
return error;
}
-
arch_initcall(arch_kdebugfs_init);
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index e1a21d6..b04e2c0 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -278,7 +278,9 @@
default:
break;
}
+#ifndef CONFIG_DEBUG_BOOT_PARAMS
free_early(pa_data, pa_data+sizeof(*data)+data->len);
+#endif
pa_data = data->next;
early_iounmap(data, PAGE_SIZE);
}