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linux/arch/x86/kernel/cpu/mtrr/if.c
Paul Gortmaker eb008eb6f8 x86: Audit and remove any remaining 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.  In the case of
some of these which are modular, we can extend that to also include
files that are building basic support functionality but not related
to loading or registering the final module; such files also have
no need whatsoever for module.h

The advantage in removing such instances 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 instance for the
presence of either and replace as needed.

In the case of crypto/glue_helper.c we delete a redundant instance
of MODULE_LICENSE in order to delete module.h -- the license info
is already present at the top of the file.

The uncore change warrants a mention too; it is uncore.c that uses
module.h and not uncore.h; hence the relocation done there.

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/20160714001901.31603-9-paul.gortmaker@windriver.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-14 15:07:00 +02:00

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#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#define LINE_SIZE 80
#include <asm/mtrr.h>
#include "mtrr.h"
#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
static const char *const mtrr_strings[MTRR_NUM_TYPES] =
{
"uncachable", /* 0 */
"write-combining", /* 1 */
"?", /* 2 */
"?", /* 3 */
"write-through", /* 4 */
"write-protect", /* 5 */
"write-back", /* 6 */
};
const char *mtrr_attrib_to_str(int x)
{
return (x <= 6) ? mtrr_strings[x] : "?";
}
#ifdef CONFIG_PROC_FS
static int
mtrr_file_add(unsigned long base, unsigned long size,
unsigned int type, bool increment, struct file *file, int page)
{
unsigned int *fcount = FILE_FCOUNT(file);
int reg, max;
max = num_var_ranges;
if (fcount == NULL) {
fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL);
if (!fcount)
return -ENOMEM;
FILE_FCOUNT(file) = fcount;
}
if (!page) {
if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
return -EINVAL;
base >>= PAGE_SHIFT;
size >>= PAGE_SHIFT;
}
reg = mtrr_add_page(base, size, type, true);
if (reg >= 0)
++fcount[reg];
return reg;
}
static int
mtrr_file_del(unsigned long base, unsigned long size,
struct file *file, int page)
{
unsigned int *fcount = FILE_FCOUNT(file);
int reg;
if (!page) {
if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
return -EINVAL;
base >>= PAGE_SHIFT;
size >>= PAGE_SHIFT;
}
reg = mtrr_del_page(-1, base, size);
if (reg < 0)
return reg;
if (fcount == NULL)
return reg;
if (fcount[reg] < 1)
return -EINVAL;
--fcount[reg];
return reg;
}
/*
* seq_file can seek but we ignore it.
*
* Format of control line:
* "base=%Lx size=%Lx type=%s" or "disable=%d"
*/
static ssize_t
mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
{
int i, err;
unsigned long reg;
unsigned long long base, size;
char *ptr;
char line[LINE_SIZE];
int length;
size_t linelen;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
memset(line, 0, LINE_SIZE);
length = len;
length--;
if (length > LINE_SIZE - 1)
length = LINE_SIZE - 1;
if (length < 0)
return -EINVAL;
if (copy_from_user(line, buf, length))
return -EFAULT;
linelen = strlen(line);
ptr = line + linelen - 1;
if (linelen && *ptr == '\n')
*ptr = '\0';
if (!strncmp(line, "disable=", 8)) {
reg = simple_strtoul(line + 8, &ptr, 0);
err = mtrr_del_page(reg, 0, 0);
if (err < 0)
return err;
return len;
}
if (strncmp(line, "base=", 5))
return -EINVAL;
base = simple_strtoull(line + 5, &ptr, 0);
ptr = skip_spaces(ptr);
if (strncmp(ptr, "size=", 5))
return -EINVAL;
size = simple_strtoull(ptr + 5, &ptr, 0);
if ((base & 0xfff) || (size & 0xfff))
return -EINVAL;
ptr = skip_spaces(ptr);
if (strncmp(ptr, "type=", 5))
return -EINVAL;
ptr = skip_spaces(ptr + 5);
for (i = 0; i < MTRR_NUM_TYPES; ++i) {
if (strcmp(ptr, mtrr_strings[i]))
continue;
base >>= PAGE_SHIFT;
size >>= PAGE_SHIFT;
err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
if (err < 0)
return err;
return len;
}
return -EINVAL;
}
static long
mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
{
int err = 0;
mtrr_type type;
unsigned long base;
unsigned long size;
struct mtrr_sentry sentry;
struct mtrr_gentry gentry;
void __user *arg = (void __user *) __arg;
switch (cmd) {
case MTRRIOC_ADD_ENTRY:
case MTRRIOC_SET_ENTRY:
case MTRRIOC_DEL_ENTRY:
case MTRRIOC_KILL_ENTRY:
case MTRRIOC_ADD_PAGE_ENTRY:
case MTRRIOC_SET_PAGE_ENTRY:
case MTRRIOC_DEL_PAGE_ENTRY:
case MTRRIOC_KILL_PAGE_ENTRY:
if (copy_from_user(&sentry, arg, sizeof sentry))
return -EFAULT;
break;
case MTRRIOC_GET_ENTRY:
case MTRRIOC_GET_PAGE_ENTRY:
if (copy_from_user(&gentry, arg, sizeof gentry))
return -EFAULT;
break;
#ifdef CONFIG_COMPAT
case MTRRIOC32_ADD_ENTRY:
case MTRRIOC32_SET_ENTRY:
case MTRRIOC32_DEL_ENTRY:
case MTRRIOC32_KILL_ENTRY:
case MTRRIOC32_ADD_PAGE_ENTRY:
case MTRRIOC32_SET_PAGE_ENTRY:
case MTRRIOC32_DEL_PAGE_ENTRY:
case MTRRIOC32_KILL_PAGE_ENTRY: {
struct mtrr_sentry32 __user *s32;
s32 = (struct mtrr_sentry32 __user *)__arg;
err = get_user(sentry.base, &s32->base);
err |= get_user(sentry.size, &s32->size);
err |= get_user(sentry.type, &s32->type);
if (err)
return err;
break;
}
case MTRRIOC32_GET_ENTRY:
case MTRRIOC32_GET_PAGE_ENTRY: {
struct mtrr_gentry32 __user *g32;
g32 = (struct mtrr_gentry32 __user *)__arg;
err = get_user(gentry.regnum, &g32->regnum);
err |= get_user(gentry.base, &g32->base);
err |= get_user(gentry.size, &g32->size);
err |= get_user(gentry.type, &g32->type);
if (err)
return err;
break;
}
#endif
}
switch (cmd) {
default:
return -ENOTTY;
case MTRRIOC_ADD_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_ADD_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err =
mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
file, 0);
break;
case MTRRIOC_SET_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_SET_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
break;
case MTRRIOC_DEL_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_DEL_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err = mtrr_file_del(sentry.base, sentry.size, file, 0);
break;
case MTRRIOC_KILL_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_KILL_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err = mtrr_del(-1, sentry.base, sentry.size);
break;
case MTRRIOC_GET_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_GET_ENTRY:
#endif
if (gentry.regnum >= num_var_ranges)
return -EINVAL;
mtrr_if->get(gentry.regnum, &base, &size, &type);
/* Hide entries that go above 4GB */
if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
|| size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
gentry.base = gentry.size = gentry.type = 0;
else {
gentry.base = base << PAGE_SHIFT;
gentry.size = size << PAGE_SHIFT;
gentry.type = type;
}
break;
case MTRRIOC_ADD_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_ADD_PAGE_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err =
mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
file, 1);
break;
case MTRRIOC_SET_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_SET_PAGE_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err =
mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
break;
case MTRRIOC_DEL_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_DEL_PAGE_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err = mtrr_file_del(sentry.base, sentry.size, file, 1);
break;
case MTRRIOC_KILL_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_KILL_PAGE_ENTRY:
#endif
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
err = mtrr_del_page(-1, sentry.base, sentry.size);
break;
case MTRRIOC_GET_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
case MTRRIOC32_GET_PAGE_ENTRY:
#endif
if (gentry.regnum >= num_var_ranges)
return -EINVAL;
mtrr_if->get(gentry.regnum, &base, &size, &type);
/* Hide entries that would overflow */
if (size != (__typeof__(gentry.size))size)
gentry.base = gentry.size = gentry.type = 0;
else {
gentry.base = base;
gentry.size = size;
gentry.type = type;
}
break;
}
if (err)
return err;
switch (cmd) {
case MTRRIOC_GET_ENTRY:
case MTRRIOC_GET_PAGE_ENTRY:
if (copy_to_user(arg, &gentry, sizeof gentry))
err = -EFAULT;
break;
#ifdef CONFIG_COMPAT
case MTRRIOC32_GET_ENTRY:
case MTRRIOC32_GET_PAGE_ENTRY: {
struct mtrr_gentry32 __user *g32;
g32 = (struct mtrr_gentry32 __user *)__arg;
err = put_user(gentry.base, &g32->base);
err |= put_user(gentry.size, &g32->size);
err |= put_user(gentry.regnum, &g32->regnum);
err |= put_user(gentry.type, &g32->type);
break;
}
#endif
}
return err;
}
static int mtrr_close(struct inode *ino, struct file *file)
{
unsigned int *fcount = FILE_FCOUNT(file);
int i, max;
if (fcount != NULL) {
max = num_var_ranges;
for (i = 0; i < max; ++i) {
while (fcount[i] > 0) {
mtrr_del(i, 0, 0);
--fcount[i];
}
}
kfree(fcount);
FILE_FCOUNT(file) = NULL;
}
return single_release(ino, file);
}
static int mtrr_seq_show(struct seq_file *seq, void *offset);
static int mtrr_open(struct inode *inode, struct file *file)
{
if (!mtrr_if)
return -EIO;
if (!mtrr_if->get)
return -ENXIO;
return single_open(file, mtrr_seq_show, NULL);
}
static const struct file_operations mtrr_fops = {
.owner = THIS_MODULE,
.open = mtrr_open,
.read = seq_read,
.llseek = seq_lseek,
.write = mtrr_write,
.unlocked_ioctl = mtrr_ioctl,
.compat_ioctl = mtrr_ioctl,
.release = mtrr_close,
};
static int mtrr_seq_show(struct seq_file *seq, void *offset)
{
char factor;
int i, max;
mtrr_type type;
unsigned long base, size;
max = num_var_ranges;
for (i = 0; i < max; i++) {
mtrr_if->get(i, &base, &size, &type);
if (size == 0) {
mtrr_usage_table[i] = 0;
continue;
}
if (size < (0x100000 >> PAGE_SHIFT)) {
/* less than 1MB */
factor = 'K';
size <<= PAGE_SHIFT - 10;
} else {
factor = 'M';
size >>= 20 - PAGE_SHIFT;
}
/* Base can be > 32bit */
seq_printf(seq, "reg%02i: base=0x%06lx000 (%5luMB), size=%5lu%cB, count=%d: %s\n",
i, base, base >> (20 - PAGE_SHIFT),
size, factor,
mtrr_usage_table[i], mtrr_attrib_to_str(type));
}
return 0;
}
static int __init mtrr_if_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
(!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
(!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
return -ENODEV;
proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
return 0;
}
arch_initcall(mtrr_if_init);
#endif /* CONFIG_PROC_FS */
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