linux/arch/x86/kernel/kdebugfs.c
Daniel Kiper b3c72fc9a7 x86/boot: Introduce setup_indirect
The setup_data is a bit awkward to use for extremely large data objects,
both because the setup_data header has to be adjacent to the data object
and because it has a 32-bit length field. However, it is important that
intermediate stages of the boot process have a way to identify which
chunks of memory are occupied by kernel data. Thus introduce an uniform
way to specify such indirect data as setup_indirect struct and
SETUP_INDIRECT type.

And finally bump setup_header version in arch/x86/boot/header.S.

Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: ard.biesheuvel@linaro.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: dave.hansen@linux.intel.com
Cc: eric.snowberg@oracle.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juergen Gross <jgross@suse.com>
Cc: kanth.ghatraju@oracle.com
Cc: linux-doc@vger.kernel.org
Cc: linux-efi <linux-efi@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rdunlap@infradead.org
Cc: ross.philipson@oracle.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Cc: xen-devel@lists.xenproject.org
Link: https://lkml.kernel.org/r/20191112134640.16035-4-daniel.kiper@oracle.com
2019-11-12 16:21:15 +01:00

177 lines
3.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Architecture specific debugfs files
*
* Copyright (C) 2007, Intel Corp.
* Huang Ying <ying.huang@intel.com>
*/
#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;
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 + pos;
/* Is it direct data or invalid indirect one? */
if (!(node->type & SETUP_INDIRECT) || node->type == SETUP_INDIRECT)
pa += sizeof(struct setup_data);
p = memremap(pa, count, MEMREMAP_WB);
if (!p)
return -ENOMEM;
remain = copy_to_user(user_buf, p, count);
memunmap(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 void __init
create_setup_data_node(struct dentry *parent, int no,
struct setup_data_node *node)
{
struct dentry *d;
char buf[16];
sprintf(buf, "%d", no);
d = debugfs_create_dir(buf, parent);
debugfs_create_x32("type", S_IRUGO, d, &node->type);
debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
}
static int __init create_setup_data_nodes(struct dentry *parent)
{
struct setup_data_node *node;
struct setup_data *data;
int error;
struct dentry *d;
u64 pa_data;
int no = 0;
d = debugfs_create_dir("setup_data", parent);
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
node = kmalloc(sizeof(*node), GFP_KERNEL);
if (!node) {
error = -ENOMEM;
goto err_dir;
}
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
if (!data) {
kfree(node);
error = -ENOMEM;
goto err_dir;
}
if (data->type == SETUP_INDIRECT &&
((struct setup_indirect *)data->data)->type != SETUP_INDIRECT) {
node->paddr = ((struct setup_indirect *)data->data)->addr;
node->type = ((struct setup_indirect *)data->data)->type;
node->len = ((struct setup_indirect *)data->data)->len;
} else {
node->paddr = pa_data;
node->type = data->type;
node->len = data->len;
}
create_setup_data_node(d, no, node);
pa_data = data->next;
memunmap(data);
no++;
}
return 0;
err_dir:
debugfs_remove_recursive(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;
int error;
dbp = debugfs_create_dir("boot_params", arch_debugfs_dir);
debugfs_create_x16("version", S_IRUGO, dbp, &boot_params.hdr.version);
debugfs_create_blob("data", S_IRUGO, dbp, &boot_params_blob);
error = create_setup_data_nodes(dbp);
if (error)
debugfs_remove_recursive(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);
#ifdef CONFIG_DEBUG_BOOT_PARAMS
error = boot_params_kdebugfs_init();
#endif
return error;
}
arch_initcall(arch_kdebugfs_init);