[linux-2.6-block.git] / arch / x86 / kernel / cpu / mtrr / if.c

#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include <linux/module.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 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, &gentry.base, &size, &type);

		/* Hide entries that go above 4GB */
		if (gentry.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 <<= 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, &gentry.base, &size, &type);
		/* Hide entries that would overflow */
		if (size != (__typeof__(gentry.size))size)
			gentry.base = gentry.size = gentry.type = 0;
		else {
			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, len;
	mtrr_type type;
	unsigned long base, size;

	len = 0;
	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 */
		len += 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  */
Commit	Line	Data
a9415644	1	#include <linux/capability.h>
1da177e4	2	#include <linux/seq_file.h>
26dc67ed JSR	3	#include <linux/uaccess.h>
	4	#include <linux/proc_fs.h>
	5	#include <linux/module.h>
	6	#include <linux/ctype.h>
e7d2860b	7	#include <linux/string.h>
5a0e3ad6	8	#include <linux/slab.h>
26dc67ed	9	#include <linux/init.h>
1da177e4 LT	10
	11	#define LINE_SIZE 80
	12
	13	#include <asm/mtrr.h>
26dc67ed	14
1da177e4 LT	15	#include "mtrr.h"
1da177e4 LT	16
1da177e4 LT	17	#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
1da177e4 LT	18
365bff80	19	static const char *const mtrr_strings[MTRR_NUM_TYPES] =
1da177e4	20	{
26dc67ed JSR	21	"uncachable", /* 0 */
	22	"write-combining", /* 1 */
	23	"?", /* 2 */
	24	"?", /* 3 */
	25	"write-through", /* 4 */
	26	"write-protect", /* 5 */
	27	"write-back", /* 6 */
1da177e4 LT	28	};
1da177e4 LT	29
365bff80	30	const char *mtrr_attrib_to_str(int x)
1da177e4 LT	31	{
	32	return (x <= 6) ? mtrr_strings[x] : "?";
	33	}
	34
	35	#ifdef CONFIG_PROC_FS
	36
	37	static int
	38	mtrr_file_add(unsigned long base, unsigned long size,
2d2ee8de	39	unsigned int type, bool increment, struct file *file, int page)
1da177e4	40	{
26dc67ed	41	unsigned int *fcount = FILE_FCOUNT(file);
1da177e4	42	int reg, max;
1da177e4 LT	43
	44	max = num_var_ranges;
	45	if (fcount == NULL) {
9cfa5b5d	46	fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL);
1da177e4 LT	47	if (!fcount)
1da177e4 LT	48	return -ENOMEM;
1da177e4 LT	49	FILE_FCOUNT(file) = fcount;
	50	}
	51	if (!page) {
	52	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	53	return -EINVAL;
	54	base >>= PAGE_SHIFT;
	55	size >>= PAGE_SHIFT;
	56	}
2d2ee8de	57	reg = mtrr_add_page(base, size, type, true);
1da177e4 LT	58	if (reg >= 0)
	59	++fcount[reg];
	60	return reg;
	61	}
	62
	63	static int
	64	mtrr_file_del(unsigned long base, unsigned long size,
	65	struct file *file, int page)
	66	{
1da177e4	67	unsigned int *fcount = FILE_FCOUNT(file);
26dc67ed	68	int reg;
1da177e4 LT	69
	70	if (!page) {
	71	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	72	return -EINVAL;
	73	base >>= PAGE_SHIFT;
	74	size >>= PAGE_SHIFT;
	75	}
	76	reg = mtrr_del_page(-1, base, size);
	77	if (reg < 0)
	78	return reg;
	79	if (fcount == NULL)
	80	return reg;
	81	if (fcount[reg] < 1)
	82	return -EINVAL;
	83	--fcount[reg];
	84	return reg;
	85	}
	86
26dc67ed JSR	87	/*
	88	* seq_file can seek but we ignore it.
	89	*
	90	* Format of control line:
	91	* "base=%Lx size=%Lx type=%s" or "disable=%d"
	92	*/
1da177e4 LT	93	static ssize_t
1da177e4 LT	94	mtrr_write(struct file file, const char __user buf, size_t len, loff_t * ppos)
1da177e4 LT	95	{
	96	int i, err;
	97	unsigned long reg;
	98	unsigned long long base, size;
	99	char *ptr;
	100	char line[LINE_SIZE];
11879ba5	101	int length;
1da177e4 LT	102	size_t linelen;
	103
	104	if (!capable(CAP_SYS_ADMIN))
	105	return -EPERM;
26dc67ed	106
1da177e4	107	memset(line, 0, LINE_SIZE);
11879ba5 AV	108
	109	length = len;
	110	length--;
	111
	112	if (length > LINE_SIZE - 1)
	113	length = LINE_SIZE - 1;
	114
	115	if (length < 0)
	116	return -EINVAL;
	117
	118	if (copy_from_user(line, buf, length))
1da177e4	119	return -EFAULT;
26dc67ed	120
1da177e4 LT	121	linelen = strlen(line);
	122	ptr = line + linelen - 1;
	123	if (linelen && *ptr == '\n')
	124	*ptr = '\0';
26dc67ed	125
1da177e4 LT	126	if (!strncmp(line, "disable=", 8)) {
	127	reg = simple_strtoul(line + 8, &ptr, 0);
	128	err = mtrr_del_page(reg, 0, 0);
	129	if (err < 0)
	130	return err;
	131	return len;
	132	}
26dc67ed	133
1da177e4 LT	134	if (strncmp(line, "base=", 5))
1da177e4 LT	135	return -EINVAL;
26dc67ed	136
1da177e4	137	base = simple_strtoull(line + 5, &ptr, 0);
e7d2860b	138	ptr = skip_spaces(ptr);
26dc67ed	139
1da177e4 LT	140	if (strncmp(ptr, "size=", 5))
1da177e4 LT	141	return -EINVAL;
26dc67ed	142
1da177e4 LT	143	size = simple_strtoull(ptr + 5, &ptr, 0);
	144	if ((base & 0xfff) \|\| (size & 0xfff))
	145	return -EINVAL;
e7d2860b	146	ptr = skip_spaces(ptr);
26dc67ed	147
1da177e4 LT	148	if (strncmp(ptr, "type=", 5))
1da177e4 LT	149	return -EINVAL;
e7d2860b	150	ptr = skip_spaces(ptr + 5);
26dc67ed	151
1da177e4 LT	152	for (i = 0; i < MTRR_NUM_TYPES; ++i) {
	153	if (strcmp(ptr, mtrr_strings[i]))
	154	continue;
	155	base >>= PAGE_SHIFT;
	156	size >>= PAGE_SHIFT;
26dc67ed	157	err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
1da177e4 LT	158	if (err < 0)
	159	return err;
	160	return len;
	161	}
	162	return -EINVAL;
	163	}
	164
c5311781 BG	165	static long
c5311781 BG	166	mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
1da177e4	167	{
c5311781	168	int err = 0;
1da177e4	169	mtrr_type type;
365bff80	170	unsigned long size;
1da177e4 LT	171	struct mtrr_sentry sentry;
	172	struct mtrr_gentry gentry;
	173	void __user arg = (void __user ) __arg;
	174
c5311781 BG	175	switch (cmd) {
	176	case MTRRIOC_ADD_ENTRY:
	177	case MTRRIOC_SET_ENTRY:
	178	case MTRRIOC_DEL_ENTRY:
	179	case MTRRIOC_KILL_ENTRY:
	180	case MTRRIOC_ADD_PAGE_ENTRY:
	181	case MTRRIOC_SET_PAGE_ENTRY:
	182	case MTRRIOC_DEL_PAGE_ENTRY:
	183	case MTRRIOC_KILL_PAGE_ENTRY:
	184	if (copy_from_user(&sentry, arg, sizeof sentry))
	185	return -EFAULT;
	186	break;
	187	case MTRRIOC_GET_ENTRY:
	188	case MTRRIOC_GET_PAGE_ENTRY:
	189	if (copy_from_user(&gentry, arg, sizeof gentry))
	190	return -EFAULT;
	191	break;
	192	#ifdef CONFIG_COMPAT
	193	case MTRRIOC32_ADD_ENTRY:
	194	case MTRRIOC32_SET_ENTRY:
	195	case MTRRIOC32_DEL_ENTRY:
	196	case MTRRIOC32_KILL_ENTRY:
	197	case MTRRIOC32_ADD_PAGE_ENTRY:
	198	case MTRRIOC32_SET_PAGE_ENTRY:
	199	case MTRRIOC32_DEL_PAGE_ENTRY:
	200	case MTRRIOC32_KILL_PAGE_ENTRY: {
26dc67ed JSR	201	struct mtrr_sentry32 __user *s32;
	202
	203	s32 = (struct mtrr_sentry32 __user *)__arg;
c5311781 BG	204	err = get_user(sentry.base, &s32->base);
	205	err \|= get_user(sentry.size, &s32->size);
	206	err \|= get_user(sentry.type, &s32->type);
	207	if (err)
	208	return err;
	209	break;
	210	}
	211	case MTRRIOC32_GET_ENTRY:
	212	case MTRRIOC32_GET_PAGE_ENTRY: {
26dc67ed JSR	213	struct mtrr_gentry32 __user *g32;
	214
	215	g32 = (struct mtrr_gentry32 __user *)__arg;
c5311781 BG	216	err = get_user(gentry.regnum, &g32->regnum);
	217	err \|= get_user(gentry.base, &g32->base);
	218	err \|= get_user(gentry.size, &g32->size);
	219	err \|= get_user(gentry.type, &g32->type);
	220	if (err)
	221	return err;
	222	break;
	223	}
	224	#endif
	225	}
	226
1da177e4 LT	227	switch (cmd) {
	228	default:
	229	return -ENOTTY;
	230	case MTRRIOC_ADD_ENTRY:
98838ec9 GP	231	#ifdef CONFIG_COMPAT
	232	case MTRRIOC32_ADD_ENTRY:
	233	#endif
1da177e4 LT	234	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	235	return -EPERM;
1da177e4	236	err =
2d2ee8de	237	mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
1da177e4	238	file, 0);
1da177e4 LT	239	break;
1da177e4 LT	240	case MTRRIOC_SET_ENTRY:
98838ec9 GP	241	#ifdef CONFIG_COMPAT
	242	case MTRRIOC32_SET_ENTRY:
	243	#endif
1da177e4 LT	244	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	245	return -EPERM;
2d2ee8de	246	err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
1da177e4 LT	247	break;
1da177e4 LT	248	case MTRRIOC_DEL_ENTRY:
98838ec9 GP	249	#ifdef CONFIG_COMPAT
	250	case MTRRIOC32_DEL_ENTRY:
	251	#endif
1da177e4 LT	252	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	253	return -EPERM;
1da177e4	254	err = mtrr_file_del(sentry.base, sentry.size, file, 0);
1da177e4 LT	255	break;
1da177e4 LT	256	case MTRRIOC_KILL_ENTRY:
98838ec9 GP	257	#ifdef CONFIG_COMPAT
	258	case MTRRIOC32_KILL_ENTRY:
	259	#endif
1da177e4 LT	260	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	261	return -EPERM;
1da177e4	262	err = mtrr_del(-1, sentry.base, sentry.size);
1da177e4 LT	263	break;
1da177e4 LT	264	case MTRRIOC_GET_ENTRY:
98838ec9 GP	265	#ifdef CONFIG_COMPAT
	266	case MTRRIOC32_GET_ENTRY:
	267	#endif
1da177e4 LT	268	if (gentry.regnum >= num_var_ranges)
1da177e4 LT	269	return -EINVAL;
365bff80	270	mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
1da177e4 LT	271
1da177e4 LT	272	/* Hide entries that go above 4GB */
365bff80 JB	273	if (gentry.base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
365bff80 JB	274	\|\| size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
1da177e4 LT	275	gentry.base = gentry.size = gentry.type = 0;
	276	else {
	277	gentry.base <<= PAGE_SHIFT;
365bff80	278	gentry.size = size << PAGE_SHIFT;
1da177e4 LT	279	gentry.type = type;
	280	}
	281
1da177e4 LT	282	break;
1da177e4 LT	283	case MTRRIOC_ADD_PAGE_ENTRY:
98838ec9 GP	284	#ifdef CONFIG_COMPAT
	285	case MTRRIOC32_ADD_PAGE_ENTRY:
	286	#endif
1da177e4 LT	287	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	288	return -EPERM;
1da177e4	289	err =
2d2ee8de	290	mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
1da177e4	291	file, 1);
1da177e4 LT	292	break;
1da177e4 LT	293	case MTRRIOC_SET_PAGE_ENTRY:
98838ec9 GP	294	#ifdef CONFIG_COMPAT
	295	case MTRRIOC32_SET_PAGE_ENTRY:
	296	#endif
1da177e4 LT	297	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	298	return -EPERM;
2d2ee8de PJ	299	err =
2d2ee8de PJ	300	mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
1da177e4 LT	301	break;
1da177e4 LT	302	case MTRRIOC_DEL_PAGE_ENTRY:
98838ec9 GP	303	#ifdef CONFIG_COMPAT
	304	case MTRRIOC32_DEL_PAGE_ENTRY:
	305	#endif
1da177e4 LT	306	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	307	return -EPERM;
1da177e4	308	err = mtrr_file_del(sentry.base, sentry.size, file, 1);
1da177e4 LT	309	break;
1da177e4 LT	310	case MTRRIOC_KILL_PAGE_ENTRY:
98838ec9 GP	311	#ifdef CONFIG_COMPAT
	312	case MTRRIOC32_KILL_PAGE_ENTRY:
	313	#endif
1da177e4 LT	314	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	315	return -EPERM;
1da177e4	316	err = mtrr_del_page(-1, sentry.base, sentry.size);
1da177e4 LT	317	break;
1da177e4 LT	318	case MTRRIOC_GET_PAGE_ENTRY:
98838ec9 GP	319	#ifdef CONFIG_COMPAT
	320	case MTRRIOC32_GET_PAGE_ENTRY:
	321	#endif
1da177e4 LT	322	if (gentry.regnum >= num_var_ranges)
1da177e4 LT	323	return -EINVAL;
365bff80 JB	324	mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
	325	/* Hide entries that would overflow */
	326	if (size != (__typeof__(gentry.size))size)
	327	gentry.base = gentry.size = gentry.type = 0;
	328	else {
	329	gentry.size = size;
	330	gentry.type = type;
	331	}
c5311781 BG	332	break;
c5311781 BG	333	}
1da177e4	334
c5311781 BG	335	if (err)
	336	return err;
	337
26dc67ed	338	switch (cmd) {
c5311781 BG	339	case MTRRIOC_GET_ENTRY:
c5311781 BG	340	case MTRRIOC_GET_PAGE_ENTRY:
1da177e4	341	if (copy_to_user(arg, &gentry, sizeof gentry))
c5311781	342	err = -EFAULT;
1da177e4	343	break;
c5311781 BG	344	#ifdef CONFIG_COMPAT
	345	case MTRRIOC32_GET_ENTRY:
	346	case MTRRIOC32_GET_PAGE_ENTRY: {
26dc67ed JSR	347	struct mtrr_gentry32 __user *g32;
	348
	349	g32 = (struct mtrr_gentry32 __user *)__arg;
c5311781 BG	350	err = put_user(gentry.base, &g32->base);
	351	err \|= put_user(gentry.size, &g32->size);
	352	err \|= put_user(gentry.regnum, &g32->regnum);
	353	err \|= put_user(gentry.type, &g32->type);
	354	break;
	355	}
	356	#endif
1da177e4	357	}
c5311781	358	return err;
1da177e4 LT	359	}
1da177e4 LT	360
26dc67ed	361	static int mtrr_close(struct inode ino, struct file file)
1da177e4	362	{
1da177e4	363	unsigned int *fcount = FILE_FCOUNT(file);
26dc67ed	364	int i, max;
1da177e4 LT	365
	366	if (fcount != NULL) {
	367	max = num_var_ranges;
	368	for (i = 0; i < max; ++i) {
	369	while (fcount[i] > 0) {
	370	mtrr_del(i, 0, 0);
	371	--fcount[i];
	372	}
	373	}
	374	kfree(fcount);
	375	FILE_FCOUNT(file) = NULL;
	376	}
	377	return single_release(ino, file);
	378	}
	379
	380	static int mtrr_seq_show(struct seq_file seq, void offset);
	381
	382	static int mtrr_open(struct inode inode, struct file file)
	383	{
26dc67ed	384	if (!mtrr_if)
1da177e4	385	return -EIO;
26dc67ed JSR	386	if (!mtrr_if->get)
26dc67ed JSR	387	return -ENXIO;
1da177e4 LT	388	return single_open(file, mtrr_seq_show, NULL);
	389	}
	390
5dfe4c96	391	static const struct file_operations mtrr_fops = {
26dc67ed JSR	392	.owner = THIS_MODULE,
	393	.open = mtrr_open,
	394	.read = seq_read,
	395	.llseek = seq_lseek,
	396	.write = mtrr_write,
	397	.unlocked_ioctl = mtrr_ioctl,
	398	.compat_ioctl = mtrr_ioctl,
	399	.release = mtrr_close,
1da177e4 LT	400	};
1da177e4 LT	401
1da177e4 LT	402	static int mtrr_seq_show(struct seq_file seq, void offset)
	403	{
	404	char factor;
	405	int i, max, len;
	406	mtrr_type type;
365bff80	407	unsigned long base, size;
1da177e4 LT	408
	409	len = 0;
	410	max = num_var_ranges;
	411	for (i = 0; i < max; i++) {
	412	mtrr_if->get(i, &base, &size, &type);
26dc67ed	413	if (size == 0) {
99fc8d42	414	mtrr_usage_table[i] = 0;
26dc67ed	415	continue;
1da177e4	416	}
26dc67ed JSR	417	if (size < (0x100000 >> PAGE_SHIFT)) {
	418	/* less than 1MB */
	419	factor = 'K';
	420	size <<= PAGE_SHIFT - 10;
	421	} else {
	422	factor = 'M';
	423	size >>= 20 - PAGE_SHIFT;
	424	}
	425	/* Base can be > 32bit */
	426	len += seq_printf(seq, "reg%02i: base=0x%06lx000 "
	427	"(%5luMB), size=%5lu%cB, count=%d: %s\n",
	428	i, base, base >> (20 - PAGE_SHIFT), size,
	429	factor, mtrr_usage_table[i],
	430	mtrr_attrib_to_str(type));
1da177e4 LT	431	}
	432	return 0;
	433	}
	434
	435	static int __init mtrr_if_init(void)
	436	{
	437	struct cpuinfo_x86 *c = &boot_cpu_data;
	438
	439	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
	440	(!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
	441	(!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
	442	(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
	443	return -ENODEV;
	444
99b76233	445	proc_create("mtrr", S_IWUSR \| S_IRUGO, NULL, &mtrr_fops);
1da177e4 LT	446	return 0;
1da177e4 LT	447	}
1da177e4 LT	448	arch_initcall(mtrr_if_init);
1da177e4 LT	449	#endif /* CONFIG_PROC_FS */