linux/arch/x86/kernel/kdebugfs.c
Paul Gortmaker 186f43608a x86/kernel: Audit and remove any unnecessary uses of module.h
Historically a lot of these existed because we did not have
a distinction between what was modular code and what was providing
support to modules via EXPORT_SYMBOL and friends.  That changed
when we forked out support for the latter into the export.h file.

This means we should be able to reduce the usage of module.h
in code that is obj-y Makefile or bool Kconfig.  The advantage
in doing so is that module.h itself sources about 15 other headers;
adding significantly to what we feed cpp, and it can obscure what
headers we are effectively using.

Since module.h was the source for init.h (for __init) and for
export.h (for EXPORT_SYMBOL) we consider each obj-y/bool instance
for the presence of either and replace as needed.  Build testing
revealed some implicit header usage that was fixed up accordingly.

Note that some bool/obj-y instances remain since module.h is
the header for some exception table entry stuff, and for things
like __init_or_module (code that is tossed when MODULES=n).

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160714001901.31603-4-paul.gortmaker@windriver.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-14 15:06:41 +02:00

215 lines
3.9 KiB
C

/*
* Architecture specific debugfs files
*
* Copyright (C) 2007, Intel Corp.
* Huang Ying <ying.huang@intel.com>
*
* This file is released under the GPLv2.
*/
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <asm/setup.h>
struct dentry *arch_debugfs_dir;
EXPORT_SYMBOL(arch_debugfs_dir);
#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 const struct file_operations fops_setup_data = {
.read = setup_data_read,
.open = simple_open,
.llseek = default_llseek,
};
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];
sprintf(buf, "%d", no);
d = debugfs_create_dir(buf, parent);
if (!d)
return -ENOMEM;
type = debugfs_create_x32("type", S_IRUGO, d, &node->type);
if (!type)
goto err_dir;
data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
if (!data)
goto err_type;
return 0;
err_type:
debugfs_remove(type);
err_dir:
debugfs_remove(d);
return -ENOMEM;
}
static int __init create_setup_data_nodes(struct dentry *parent)
{
struct setup_data_node *node;
struct setup_data *data;
int error;
struct dentry *d;
struct page *pg;
u64 pa_data;
int no = 0;
d = debugfs_create_dir("setup_data", parent);
if (!d)
return -ENOMEM;
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) {
kfree(node);
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);
return error;
}
static struct debugfs_blob_wrapper boot_params_blob = {
.data = &boot_params,
.size = sizeof(boot_params),
};
static int __init boot_params_kdebugfs_init(void)
{
struct dentry *dbp, *version, *data;
int error = -ENOMEM;
dbp = debugfs_create_dir("boot_params", NULL);
if (!dbp)
return -ENOMEM;
version = debugfs_create_x16("version", S_IRUGO, dbp,
&boot_params.hdr.version);
if (!version)
goto err_dir;
data = debugfs_create_blob("data", S_IRUGO, dbp,
&boot_params_blob);
if (!data)
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:
debugfs_remove(dbp);
return error;
}
#endif /* CONFIG_DEBUG_BOOT_PARAMS */
static int __init arch_kdebugfs_init(void)
{
int error = 0;
arch_debugfs_dir = debugfs_create_dir("x86", NULL);
if (!arch_debugfs_dir)
return -ENOMEM;
#ifdef CONFIG_DEBUG_BOOT_PARAMS
error = boot_params_kdebugfs_init();
#endif
return error;
}
arch_initcall(arch_kdebugfs_init);