[GitHub/mt8127/android_kernel_alcatel_ttab.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/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);
	while (isspace(*ptr))
		ptr++;

	if (strncmp(ptr, "size=", 5))
		return -EINVAL;

	size = simple_strtoull(ptr + 5, &ptr, 0);
	if ((base & 0xfff) || (size & 0xfff))
		return -EINVAL;
	while (isspace(*ptr))
		ptr++;

	if (strncmp(ptr, "type=", 5))
		return -EINVAL;
	ptr += 5;
	while (isspace(*ptr))
		ptr++;

	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>
	7	#include <linux/init.h>
1da177e4 LT	8
	9	#define LINE_SIZE 80
	10
	11	#include <asm/mtrr.h>
26dc67ed	12
1da177e4 LT	13	#include "mtrr.h"
1da177e4 LT	14
1da177e4 LT	15	#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
1da177e4 LT	16
365bff80	17	static const char *const mtrr_strings[MTRR_NUM_TYPES] =
1da177e4	18	{
26dc67ed JSR	19	"uncachable", /* 0 */
	20	"write-combining", /* 1 */
	21	"?", /* 2 */
	22	"?", /* 3 */
	23	"write-through", /* 4 */
	24	"write-protect", /* 5 */
	25	"write-back", /* 6 */
1da177e4 LT	26	};
1da177e4 LT	27
365bff80	28	const char *mtrr_attrib_to_str(int x)
1da177e4 LT	29	{
	30	return (x <= 6) ? mtrr_strings[x] : "?";
	31	}
	32
	33	#ifdef CONFIG_PROC_FS
	34
	35	static int
	36	mtrr_file_add(unsigned long base, unsigned long size,
2d2ee8de	37	unsigned int type, bool increment, struct file *file, int page)
1da177e4	38	{
26dc67ed	39	unsigned int *fcount = FILE_FCOUNT(file);
1da177e4	40	int reg, max;
1da177e4 LT	41
	42	max = num_var_ranges;
	43	if (fcount == NULL) {
9cfa5b5d	44	fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL);
1da177e4 LT	45	if (!fcount)
1da177e4 LT	46	return -ENOMEM;
1da177e4 LT	47	FILE_FCOUNT(file) = fcount;
	48	}
	49	if (!page) {
	50	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	51	return -EINVAL;
	52	base >>= PAGE_SHIFT;
	53	size >>= PAGE_SHIFT;
	54	}
2d2ee8de	55	reg = mtrr_add_page(base, size, type, true);
1da177e4 LT	56	if (reg >= 0)
	57	++fcount[reg];
	58	return reg;
	59	}
	60
	61	static int
	62	mtrr_file_del(unsigned long base, unsigned long size,
	63	struct file *file, int page)
	64	{
1da177e4	65	unsigned int *fcount = FILE_FCOUNT(file);
26dc67ed	66	int reg;
1da177e4 LT	67
	68	if (!page) {
	69	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	70	return -EINVAL;
	71	base >>= PAGE_SHIFT;
	72	size >>= PAGE_SHIFT;
	73	}
	74	reg = mtrr_del_page(-1, base, size);
	75	if (reg < 0)
	76	return reg;
	77	if (fcount == NULL)
	78	return reg;
	79	if (fcount[reg] < 1)
	80	return -EINVAL;
	81	--fcount[reg];
	82	return reg;
	83	}
	84
26dc67ed JSR	85	/*
	86	* seq_file can seek but we ignore it.
	87	*
	88	* Format of control line:
	89	* "base=%Lx size=%Lx type=%s" or "disable=%d"
	90	*/
1da177e4 LT	91	static ssize_t
1da177e4 LT	92	mtrr_write(struct file file, const char __user buf, size_t len, loff_t * ppos)
1da177e4 LT	93	{
	94	int i, err;
	95	unsigned long reg;
	96	unsigned long long base, size;
	97	char *ptr;
	98	char line[LINE_SIZE];
11879ba5	99	int length;
1da177e4 LT	100	size_t linelen;
	101
	102	if (!capable(CAP_SYS_ADMIN))
	103	return -EPERM;
26dc67ed	104
1da177e4	105	memset(line, 0, LINE_SIZE);
11879ba5 AV	106
	107	length = len;
	108	length--;
	109
	110	if (length > LINE_SIZE - 1)
	111	length = LINE_SIZE - 1;
	112
	113	if (length < 0)
	114	return -EINVAL;
	115
	116	if (copy_from_user(line, buf, length))
1da177e4	117	return -EFAULT;
26dc67ed	118
1da177e4 LT	119	linelen = strlen(line);
	120	ptr = line + linelen - 1;
	121	if (linelen && *ptr == '\n')
	122	*ptr = '\0';
26dc67ed	123
1da177e4 LT	124	if (!strncmp(line, "disable=", 8)) {
	125	reg = simple_strtoul(line + 8, &ptr, 0);
	126	err = mtrr_del_page(reg, 0, 0);
	127	if (err < 0)
	128	return err;
	129	return len;
	130	}
26dc67ed	131
1da177e4 LT	132	if (strncmp(line, "base=", 5))
1da177e4 LT	133	return -EINVAL;
26dc67ed	134
1da177e4	135	base = simple_strtoull(line + 5, &ptr, 0);
9ff6d8e0 JP	136	while (isspace(*ptr))
9ff6d8e0 JP	137	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;
9ff6d8e0 JP	145	while (isspace(*ptr))
9ff6d8e0 JP	146	ptr++;
26dc67ed	147
1da177e4 LT	148	if (strncmp(ptr, "type=", 5))
	149	return -EINVAL;
	150	ptr += 5;
9ff6d8e0 JP	151	while (isspace(*ptr))
9ff6d8e0 JP	152	ptr++;
26dc67ed	153
1da177e4 LT	154	for (i = 0; i < MTRR_NUM_TYPES; ++i) {
	155	if (strcmp(ptr, mtrr_strings[i]))
	156	continue;
	157	base >>= PAGE_SHIFT;
	158	size >>= PAGE_SHIFT;
26dc67ed	159	err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
1da177e4 LT	160	if (err < 0)
	161	return err;
	162	return len;
	163	}
	164	return -EINVAL;
	165	}
	166
c5311781 BG	167	static long
c5311781 BG	168	mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
1da177e4	169	{
c5311781	170	int err = 0;
1da177e4	171	mtrr_type type;
365bff80	172	unsigned long size;
1da177e4 LT	173	struct mtrr_sentry sentry;
	174	struct mtrr_gentry gentry;
	175	void __user arg = (void __user ) __arg;
	176
c5311781 BG	177	switch (cmd) {
	178	case MTRRIOC_ADD_ENTRY:
	179	case MTRRIOC_SET_ENTRY:
	180	case MTRRIOC_DEL_ENTRY:
	181	case MTRRIOC_KILL_ENTRY:
	182	case MTRRIOC_ADD_PAGE_ENTRY:
	183	case MTRRIOC_SET_PAGE_ENTRY:
	184	case MTRRIOC_DEL_PAGE_ENTRY:
	185	case MTRRIOC_KILL_PAGE_ENTRY:
	186	if (copy_from_user(&sentry, arg, sizeof sentry))
	187	return -EFAULT;
	188	break;
	189	case MTRRIOC_GET_ENTRY:
	190	case MTRRIOC_GET_PAGE_ENTRY:
	191	if (copy_from_user(&gentry, arg, sizeof gentry))
	192	return -EFAULT;
	193	break;
	194	#ifdef CONFIG_COMPAT
	195	case MTRRIOC32_ADD_ENTRY:
	196	case MTRRIOC32_SET_ENTRY:
	197	case MTRRIOC32_DEL_ENTRY:
	198	case MTRRIOC32_KILL_ENTRY:
	199	case MTRRIOC32_ADD_PAGE_ENTRY:
	200	case MTRRIOC32_SET_PAGE_ENTRY:
	201	case MTRRIOC32_DEL_PAGE_ENTRY:
	202	case MTRRIOC32_KILL_PAGE_ENTRY: {
26dc67ed JSR	203	struct mtrr_sentry32 __user *s32;
	204
	205	s32 = (struct mtrr_sentry32 __user *)__arg;
c5311781 BG	206	err = get_user(sentry.base, &s32->base);
	207	err \|= get_user(sentry.size, &s32->size);
	208	err \|= get_user(sentry.type, &s32->type);
	209	if (err)
	210	return err;
	211	break;
	212	}
	213	case MTRRIOC32_GET_ENTRY:
	214	case MTRRIOC32_GET_PAGE_ENTRY: {
26dc67ed JSR	215	struct mtrr_gentry32 __user *g32;
	216
	217	g32 = (struct mtrr_gentry32 __user *)__arg;
c5311781 BG	218	err = get_user(gentry.regnum, &g32->regnum);
	219	err \|= get_user(gentry.base, &g32->base);
	220	err \|= get_user(gentry.size, &g32->size);
	221	err \|= get_user(gentry.type, &g32->type);
	222	if (err)
	223	return err;
	224	break;
	225	}
	226	#endif
	227	}
	228
1da177e4 LT	229	switch (cmd) {
	230	default:
	231	return -ENOTTY;
	232	case MTRRIOC_ADD_ENTRY:
98838ec9 GP	233	#ifdef CONFIG_COMPAT
	234	case MTRRIOC32_ADD_ENTRY:
	235	#endif
1da177e4 LT	236	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	237	return -EPERM;
1da177e4	238	err =
2d2ee8de	239	mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
1da177e4	240	file, 0);
1da177e4 LT	241	break;
1da177e4 LT	242	case MTRRIOC_SET_ENTRY:
98838ec9 GP	243	#ifdef CONFIG_COMPAT
	244	case MTRRIOC32_SET_ENTRY:
	245	#endif
1da177e4 LT	246	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	247	return -EPERM;
2d2ee8de	248	err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
1da177e4 LT	249	break;
1da177e4 LT	250	case MTRRIOC_DEL_ENTRY:
98838ec9 GP	251	#ifdef CONFIG_COMPAT
	252	case MTRRIOC32_DEL_ENTRY:
	253	#endif
1da177e4 LT	254	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	255	return -EPERM;
1da177e4	256	err = mtrr_file_del(sentry.base, sentry.size, file, 0);
1da177e4 LT	257	break;
1da177e4 LT	258	case MTRRIOC_KILL_ENTRY:
98838ec9 GP	259	#ifdef CONFIG_COMPAT
	260	case MTRRIOC32_KILL_ENTRY:
	261	#endif
1da177e4 LT	262	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	263	return -EPERM;
1da177e4	264	err = mtrr_del(-1, sentry.base, sentry.size);
1da177e4 LT	265	break;
1da177e4 LT	266	case MTRRIOC_GET_ENTRY:
98838ec9 GP	267	#ifdef CONFIG_COMPAT
	268	case MTRRIOC32_GET_ENTRY:
	269	#endif
1da177e4 LT	270	if (gentry.regnum >= num_var_ranges)
1da177e4 LT	271	return -EINVAL;
365bff80	272	mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
1da177e4 LT	273
1da177e4 LT	274	/* Hide entries that go above 4GB */
365bff80 JB	275	if (gentry.base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
365bff80 JB	276	\|\| size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
1da177e4 LT	277	gentry.base = gentry.size = gentry.type = 0;
	278	else {
	279	gentry.base <<= PAGE_SHIFT;
365bff80	280	gentry.size = size << PAGE_SHIFT;
1da177e4 LT	281	gentry.type = type;
	282	}
	283
1da177e4 LT	284	break;
1da177e4 LT	285	case MTRRIOC_ADD_PAGE_ENTRY:
98838ec9 GP	286	#ifdef CONFIG_COMPAT
	287	case MTRRIOC32_ADD_PAGE_ENTRY:
	288	#endif
1da177e4 LT	289	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	290	return -EPERM;
1da177e4	291	err =
2d2ee8de	292	mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
1da177e4	293	file, 1);
1da177e4 LT	294	break;
1da177e4 LT	295	case MTRRIOC_SET_PAGE_ENTRY:
98838ec9 GP	296	#ifdef CONFIG_COMPAT
	297	case MTRRIOC32_SET_PAGE_ENTRY:
	298	#endif
1da177e4 LT	299	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	300	return -EPERM;
2d2ee8de PJ	301	err =
2d2ee8de PJ	302	mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
1da177e4 LT	303	break;
1da177e4 LT	304	case MTRRIOC_DEL_PAGE_ENTRY:
98838ec9 GP	305	#ifdef CONFIG_COMPAT
	306	case MTRRIOC32_DEL_PAGE_ENTRY:
	307	#endif
1da177e4 LT	308	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	309	return -EPERM;
1da177e4	310	err = mtrr_file_del(sentry.base, sentry.size, file, 1);
1da177e4 LT	311	break;
1da177e4 LT	312	case MTRRIOC_KILL_PAGE_ENTRY:
98838ec9 GP	313	#ifdef CONFIG_COMPAT
	314	case MTRRIOC32_KILL_PAGE_ENTRY:
	315	#endif
1da177e4 LT	316	if (!capable(CAP_SYS_ADMIN))
1da177e4 LT	317	return -EPERM;
1da177e4	318	err = mtrr_del_page(-1, sentry.base, sentry.size);
1da177e4 LT	319	break;
1da177e4 LT	320	case MTRRIOC_GET_PAGE_ENTRY:
98838ec9 GP	321	#ifdef CONFIG_COMPAT
	322	case MTRRIOC32_GET_PAGE_ENTRY:
	323	#endif
1da177e4 LT	324	if (gentry.regnum >= num_var_ranges)
1da177e4 LT	325	return -EINVAL;
365bff80 JB	326	mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
	327	/* Hide entries that would overflow */
	328	if (size != (__typeof__(gentry.size))size)
	329	gentry.base = gentry.size = gentry.type = 0;
	330	else {
	331	gentry.size = size;
	332	gentry.type = type;
	333	}
c5311781 BG	334	break;
c5311781 BG	335	}
1da177e4	336
c5311781 BG	337	if (err)
	338	return err;
	339
26dc67ed	340	switch (cmd) {
c5311781 BG	341	case MTRRIOC_GET_ENTRY:
c5311781 BG	342	case MTRRIOC_GET_PAGE_ENTRY:
1da177e4	343	if (copy_to_user(arg, &gentry, sizeof gentry))
c5311781	344	err = -EFAULT;
1da177e4	345	break;
c5311781 BG	346	#ifdef CONFIG_COMPAT
	347	case MTRRIOC32_GET_ENTRY:
	348	case MTRRIOC32_GET_PAGE_ENTRY: {
26dc67ed JSR	349	struct mtrr_gentry32 __user *g32;
	350
	351	g32 = (struct mtrr_gentry32 __user *)__arg;
c5311781 BG	352	err = put_user(gentry.base, &g32->base);
	353	err \|= put_user(gentry.size, &g32->size);
	354	err \|= put_user(gentry.regnum, &g32->regnum);
	355	err \|= put_user(gentry.type, &g32->type);
	356	break;
	357	}
	358	#endif
1da177e4	359	}
c5311781	360	return err;
1da177e4 LT	361	}
1da177e4 LT	362
26dc67ed	363	static int mtrr_close(struct inode ino, struct file file)
1da177e4	364	{
1da177e4	365	unsigned int *fcount = FILE_FCOUNT(file);
26dc67ed	366	int i, max;
1da177e4 LT	367
	368	if (fcount != NULL) {
	369	max = num_var_ranges;
	370	for (i = 0; i < max; ++i) {
	371	while (fcount[i] > 0) {
	372	mtrr_del(i, 0, 0);
	373	--fcount[i];
	374	}
	375	}
	376	kfree(fcount);
	377	FILE_FCOUNT(file) = NULL;
	378	}
	379	return single_release(ino, file);
	380	}
	381
	382	static int mtrr_seq_show(struct seq_file seq, void offset);
	383
	384	static int mtrr_open(struct inode inode, struct file file)
	385	{
26dc67ed	386	if (!mtrr_if)
1da177e4	387	return -EIO;
26dc67ed JSR	388	if (!mtrr_if->get)
26dc67ed JSR	389	return -ENXIO;
1da177e4 LT	390	return single_open(file, mtrr_seq_show, NULL);
	391	}
	392
5dfe4c96	393	static const struct file_operations mtrr_fops = {
26dc67ed JSR	394	.owner = THIS_MODULE,
	395	.open = mtrr_open,
	396	.read = seq_read,
	397	.llseek = seq_lseek,
	398	.write = mtrr_write,
	399	.unlocked_ioctl = mtrr_ioctl,
	400	.compat_ioctl = mtrr_ioctl,
	401	.release = mtrr_close,
1da177e4 LT	402	};
1da177e4 LT	403
1da177e4 LT	404	static int mtrr_seq_show(struct seq_file seq, void offset)
	405	{
	406	char factor;
	407	int i, max, len;
	408	mtrr_type type;
365bff80	409	unsigned long base, size;
1da177e4 LT	410
	411	len = 0;
	412	max = num_var_ranges;
	413	for (i = 0; i < max; i++) {
	414	mtrr_if->get(i, &base, &size, &type);
26dc67ed	415	if (size == 0) {
99fc8d42	416	mtrr_usage_table[i] = 0;
26dc67ed	417	continue;
1da177e4	418	}
26dc67ed JSR	419	if (size < (0x100000 >> PAGE_SHIFT)) {
	420	/* less than 1MB */
	421	factor = 'K';
	422	size <<= PAGE_SHIFT - 10;
	423	} else {
	424	factor = 'M';
	425	size >>= 20 - PAGE_SHIFT;
	426	}
	427	/* Base can be > 32bit */
	428	len += seq_printf(seq, "reg%02i: base=0x%06lx000 "
	429	"(%5luMB), size=%5lu%cB, count=%d: %s\n",
	430	i, base, base >> (20 - PAGE_SHIFT), size,
	431	factor, mtrr_usage_table[i],
	432	mtrr_attrib_to_str(type));
1da177e4 LT	433	}
	434	return 0;
	435	}
	436
	437	static int __init mtrr_if_init(void)
	438	{
	439	struct cpuinfo_x86 *c = &boot_cpu_data;
	440
	441	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
	442	(!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
	443	(!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
	444	(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
	445	return -ENODEV;
	446
99b76233	447	proc_create("mtrr", S_IWUSR \| S_IRUGO, NULL, &mtrr_fops);
1da177e4 LT	448	return 0;
1da177e4 LT	449	}
1da177e4 LT	450	arch_initcall(mtrr_if_init);
1da177e4 LT	451	#endif /* CONFIG_PROC_FS */