[deliverable/linux.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/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  */
Commit	Line	Data
a9415644	1	#include <linux/capability.h>
1da177e4	2	#include <linux/seq_file.h>
26dc67ed JSR	3	#include <linux/uaccess.h>
26dc67ed JSR	4	#include <linux/proc_fs.h>
26dc67ed	5	#include <linux/ctype.h>
e7d2860b	6	#include <linux/string.h>
5a0e3ad6	7	#include <linux/slab.h>
26dc67ed	8	#include <linux/init.h>
1da177e4 LT	9
	10	#define LINE_SIZE 80
	11
	12	#include <asm/mtrr.h>
26dc67ed	13
1da177e4 LT	14	#include "mtrr.h"
1da177e4 LT	15
1da177e4 LT	16	#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
1da177e4 LT	17
365bff80	18	static const char *const mtrr_strings[MTRR_NUM_TYPES] =
1da177e4	19	{
26dc67ed JSR	20	"uncachable", /* 0 */
	21	"write-combining", /* 1 */
	22	"?", /* 2 */
	23	"?", /* 3 */
	24	"write-through", /* 4 */
	25	"write-protect", /* 5 */
	26	"write-back", /* 6 */
1da177e4 LT	27	};
1da177e4 LT	28
365bff80	29	const char *mtrr_attrib_to_str(int x)
1da177e4 LT	30	{
	31	return (x <= 6) ? mtrr_strings[x] : "?";
	32	}
	33
	34	#ifdef CONFIG_PROC_FS
	35
	36	static int
	37	mtrr_file_add(unsigned long base, unsigned long size,
2d2ee8de	38	unsigned int type, bool increment, struct file *file, int page)
1da177e4	39	{
26dc67ed	40	unsigned int *fcount = FILE_FCOUNT(file);
1da177e4	41	int reg, max;
1da177e4 LT	42
	43	max = num_var_ranges;
	44	if (fcount == NULL) {
9cfa5b5d	45	fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL);
1da177e4 LT	46	if (!fcount)
1da177e4 LT	47	return -ENOMEM;
1da177e4 LT	48	FILE_FCOUNT(file) = fcount;
	49	}
	50	if (!page) {
	51	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	52	return -EINVAL;
	53	base >>= PAGE_SHIFT;
	54	size >>= PAGE_SHIFT;
	55	}
2d2ee8de	56	reg = mtrr_add_page(base, size, type, true);
1da177e4 LT	57	if (reg >= 0)
	58	++fcount[reg];
	59	return reg;
	60	}
	61
	62	static int
	63	mtrr_file_del(unsigned long base, unsigned long size,
	64	struct file *file, int page)
	65	{
1da177e4	66	unsigned int *fcount = FILE_FCOUNT(file);
26dc67ed	67	int reg;
1da177e4 LT	68
	69	if (!page) {
	70	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	71	return -EINVAL;
	72	base >>= PAGE_SHIFT;
	73	size >>= PAGE_SHIFT;
	74	}
	75	reg = mtrr_del_page(-1, base, size);
	76	if (reg < 0)
	77	return reg;
	78	if (fcount == NULL)
	79	return reg;
	80	if (fcount[reg] < 1)
	81	return -EINVAL;
	82	--fcount[reg];
	83	return reg;
	84	}
	85
26dc67ed JSR	86	/*
	87	* seq_file can seek but we ignore it.
	88	*
	89	* Format of control line:
	90	* "base=%Lx size=%Lx type=%s" or "disable=%d"
	91	*/
1da177e4 LT	92	static ssize_t
1da177e4 LT	93	mtrr_write(struct file file, const char __user buf, size_t len, loff_t * ppos)
1da177e4 LT	94	{
	95	int i, err;
	96	unsigned long reg;
	97	unsigned long long base, size;
	98	char *ptr;
	99	char line[LINE_SIZE];
11879ba5	100	int length;
1da177e4 LT	101	size_t linelen;
	102
	103	if (!capable(CAP_SYS_ADMIN))
	104	return -EPERM;
26dc67ed	105
1da177e4	106	memset(line, 0, LINE_SIZE);
11879ba5 AV	107
	108	length = len;
	109	length--;
	110
	111	if (length > LINE_SIZE - 1)
	112	length = LINE_SIZE - 1;
	113
	114	if (length < 0)
	115	return -EINVAL;
	116
	117	if (copy_from_user(line, buf, length))
1da177e4	118	return -EFAULT;
26dc67ed	119
1da177e4 LT	120	linelen = strlen(line);
	121	ptr = line + linelen - 1;
	122	if (linelen && *ptr == '\n')
	123	*ptr = '\0';
26dc67ed	124
1da177e4 LT	125	if (!strncmp(line, "disable=", 8)) {
	126	reg = simple_strtoul(line + 8, &ptr, 0);
	127	err = mtrr_del_page(reg, 0, 0);
	128	if (err < 0)
	129	return err;
	130	return len;
	131	}
26dc67ed	132
1da177e4 LT	133	if (strncmp(line, "base=", 5))
1da177e4 LT	134	return -EINVAL;
26dc67ed	135
1da177e4	136	base = simple_strtoull(line + 5, &ptr, 0);
e7d2860b	137	ptr = skip_spaces(ptr);
26dc67ed	138
1da177e4 LT	139	if (strncmp(ptr, "size=", 5))
1da177e4 LT	140	return -EINVAL;
26dc67ed	141
1da177e4 LT	142	size = simple_strtoull(ptr + 5, &ptr, 0);
	143	if ((base & 0xfff) \|\| (size & 0xfff))
	144	return -EINVAL;
e7d2860b	145	ptr = skip_spaces(ptr);
26dc67ed	146
1da177e4 LT	147	if (strncmp(ptr, "type=", 5))
1da177e4 LT	148	return -EINVAL;
e7d2860b	149	ptr = skip_spaces(ptr + 5);
26dc67ed	150
1da177e4 LT	151	for (i = 0; i < MTRR_NUM_TYPES; ++i) {
	152	if (strcmp(ptr, mtrr_strings[i]))
	153	continue;
	154	base >>= PAGE_SHIFT;
	155	size >>= PAGE_SHIFT;
26dc67ed	156	err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
1da177e4 LT	157	if (err < 0)
	158	return err;
	159	return len;
	160	}
	161	return -EINVAL;
	162	}
	163
c5311781 BG	164	static long
c5311781 BG	165	mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
1da177e4	166	{
c5311781	167	int err = 0;
1da177e4	168	mtrr_type type;
b263b31e	169	unsigned long base;
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;
b263b31e	270	mtrr_if->get(gentry.regnum, &base, &size, &type);
1da177e4 LT	271
1da177e4 LT	272	/* Hide entries that go above 4GB */
b263b31e	273	if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
365bff80	274	\|\| size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
1da177e4 LT	275	gentry.base = gentry.size = gentry.type = 0;
1da177e4 LT	276	else {
b263b31e	277	gentry.base = 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;
b263b31e	324	mtrr_if->get(gentry.regnum, &base, &size, &type);
365bff80 JB	325	/* Hide entries that would overflow */
	326	if (size != (__typeof__(gentry.size))size)
	327	gentry.base = gentry.size = gentry.type = 0;
	328	else {
b263b31e	329	gentry.base = base;
365bff80 JB	330	gentry.size = size;
	331	gentry.type = type;
	332	}
c5311781 BG	333	break;
c5311781 BG	334	}
1da177e4	335
c5311781 BG	336	if (err)
	337	return err;
	338
26dc67ed	339	switch (cmd) {
c5311781 BG	340	case MTRRIOC_GET_ENTRY:
c5311781 BG	341	case MTRRIOC_GET_PAGE_ENTRY:
1da177e4	342	if (copy_to_user(arg, &gentry, sizeof gentry))
c5311781	343	err = -EFAULT;
1da177e4	344	break;
c5311781 BG	345	#ifdef CONFIG_COMPAT
	346	case MTRRIOC32_GET_ENTRY:
	347	case MTRRIOC32_GET_PAGE_ENTRY: {
26dc67ed JSR	348	struct mtrr_gentry32 __user *g32;
	349
	350	g32 = (struct mtrr_gentry32 __user *)__arg;
c5311781 BG	351	err = put_user(gentry.base, &g32->base);
	352	err \|= put_user(gentry.size, &g32->size);
	353	err \|= put_user(gentry.regnum, &g32->regnum);
	354	err \|= put_user(gentry.type, &g32->type);
	355	break;
	356	}
	357	#endif
1da177e4	358	}
c5311781	359	return err;
1da177e4 LT	360	}
1da177e4 LT	361
26dc67ed	362	static int mtrr_close(struct inode ino, struct file file)
1da177e4	363	{
1da177e4	364	unsigned int *fcount = FILE_FCOUNT(file);
26dc67ed	365	int i, max;
1da177e4 LT	366
	367	if (fcount != NULL) {
	368	max = num_var_ranges;
	369	for (i = 0; i < max; ++i) {
	370	while (fcount[i] > 0) {
	371	mtrr_del(i, 0, 0);
	372	--fcount[i];
	373	}
	374	}
	375	kfree(fcount);
	376	FILE_FCOUNT(file) = NULL;
	377	}
	378	return single_release(ino, file);
	379	}
	380
	381	static int mtrr_seq_show(struct seq_file seq, void offset);
	382
	383	static int mtrr_open(struct inode inode, struct file file)
	384	{
26dc67ed	385	if (!mtrr_if)
1da177e4	386	return -EIO;
26dc67ed JSR	387	if (!mtrr_if->get)
26dc67ed JSR	388	return -ENXIO;
1da177e4 LT	389	return single_open(file, mtrr_seq_show, NULL);
	390	}
	391
5dfe4c96	392	static const struct file_operations mtrr_fops = {
26dc67ed JSR	393	.owner = THIS_MODULE,
	394	.open = mtrr_open,
	395	.read = seq_read,
	396	.llseek = seq_lseek,
	397	.write = mtrr_write,
	398	.unlocked_ioctl = mtrr_ioctl,
	399	.compat_ioctl = mtrr_ioctl,
	400	.release = mtrr_close,
1da177e4 LT	401	};
1da177e4 LT	402
1da177e4 LT	403	static int mtrr_seq_show(struct seq_file seq, void offset)
	404	{
	405	char factor;
3ac62bc0	406	int i, max;
1da177e4	407	mtrr_type type;
365bff80	408	unsigned long base, size;
1da177e4	409
1da177e4 LT	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 */
3ac62bc0 JP	426	seq_printf(seq, "reg%02i: base=0x%06lx000 (%5luMB), size=%5lu%cB, count=%d: %s\n",
	427	i, base, base >> (20 - PAGE_SHIFT),
	428	size, factor,
	429	mtrr_usage_table[i], mtrr_attrib_to_str(type));
1da177e4 LT	430	}
	431	return 0;
	432	}
	433
	434	static int __init mtrr_if_init(void)
	435	{
	436	struct cpuinfo_x86 *c = &boot_cpu_data;
	437
	438	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
	439	(!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
	440	(!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
	441	(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
	442	return -ENODEV;
	443
99b76233	444	proc_create("mtrr", S_IWUSR \| S_IRUGO, NULL, &mtrr_fops);
1da177e4 LT	445	return 0;
1da177e4 LT	446	}
1da177e4 LT	447	arch_initcall(mtrr_if_init);
1da177e4 LT	448	#endif /* CONFIG_PROC_FS */