[deliverable/linux.git] / arch / mips / kernel / kspd.c

/*
 * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/unistd.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/syscalls.h>
#include <linux/workqueue.h>
#include <linux/errno.h>
#include <linux/list.h>

#include <asm/vpe.h>
#include <asm/rtlx.h>
#include <asm/kspd.h>

static struct workqueue_struct *workqueue = NULL;
static struct work_struct work;

extern unsigned long cpu_khz;

struct mtsp_syscall {
	int cmd;
	unsigned char abi;
	unsigned char size;
};

struct mtsp_syscall_ret {
	int retval;
	int errno;
};

struct mtsp_syscall_generic {
	int arg0;
	int arg1;
	int arg2;
	int arg3;
	int arg4;
	int arg5;
	int arg6;
};

static struct list_head kspd_notifylist;
static int sp_stopping = 0;

/* these should match with those in the SDE kit */
#define MTSP_SYSCALL_BASE	0
#define MTSP_SYSCALL_EXIT	(MTSP_SYSCALL_BASE + 0)
#define MTSP_SYSCALL_OPEN	(MTSP_SYSCALL_BASE + 1)
#define MTSP_SYSCALL_READ	(MTSP_SYSCALL_BASE + 2)
#define MTSP_SYSCALL_WRITE	(MTSP_SYSCALL_BASE + 3)
#define MTSP_SYSCALL_CLOSE	(MTSP_SYSCALL_BASE + 4)
#define MTSP_SYSCALL_LSEEK32	(MTSP_SYSCALL_BASE + 5)
#define MTSP_SYSCALL_ISATTY	(MTSP_SYSCALL_BASE + 6)
#define MTSP_SYSCALL_GETTIME	(MTSP_SYSCALL_BASE + 7)
#define MTSP_SYSCALL_PIPEFREQ	(MTSP_SYSCALL_BASE + 8)
#define MTSP_SYSCALL_GETTOD	(MTSP_SYSCALL_BASE + 9)
#define MTSP_SYSCALL_IOCTL     (MTSP_SYSCALL_BASE + 10)

#define MTSP_O_RDONLY		0x0000
#define MTSP_O_WRONLY		0x0001
#define MTSP_O_RDWR		0x0002
#define MTSP_O_NONBLOCK		0x0004
#define MTSP_O_APPEND		0x0008
#define MTSP_O_SHLOCK		0x0010
#define MTSP_O_EXLOCK		0x0020
#define MTSP_O_ASYNC		0x0040
#define MTSP_O_FSYNC		O_SYNC
#define MTSP_O_NOFOLLOW		0x0100
#define MTSP_O_SYNC		0x0080
#define MTSP_O_CREAT		0x0200
#define MTSP_O_TRUNC		0x0400
#define MTSP_O_EXCL		0x0800
#define MTSP_O_BINARY		0x8000

#define SP_VPE 1

struct apsp_table  {
	int sp;
	int ap;
};

/* we might want to do the mode flags too */
struct apsp_table open_flags_table[] = {
	{ MTSP_O_RDWR, O_RDWR },
	{ MTSP_O_WRONLY, O_WRONLY },
	{ MTSP_O_CREAT, O_CREAT },
	{ MTSP_O_TRUNC, O_TRUNC },
	{ MTSP_O_NONBLOCK, O_NONBLOCK },
	{ MTSP_O_APPEND, O_APPEND },
	{ MTSP_O_NOFOLLOW, O_NOFOLLOW }
};

struct apsp_table syscall_command_table[] = {
	{ MTSP_SYSCALL_OPEN, __NR_open },
	{ MTSP_SYSCALL_CLOSE, __NR_close },
	{ MTSP_SYSCALL_READ, __NR_read },
	{ MTSP_SYSCALL_WRITE, __NR_write },
	{ MTSP_SYSCALL_LSEEK32, __NR_lseek },
	{ MTSP_SYSCALL_IOCTL, __NR_ioctl }
};

static int sp_syscall(int num, int arg0, int arg1, int arg2, int arg3)
{
	register long int _num  __asm__ ("$2") = num;
	register long int _arg0  __asm__ ("$4") = arg0;
	register long int _arg1  __asm__ ("$5") = arg1;
	register long int _arg2  __asm__ ("$6") = arg2;
	register long int _arg3  __asm__ ("$7") = arg3;

	mm_segment_t old_fs;

	old_fs = get_fs();
 	set_fs(KERNEL_DS);

  	__asm__ __volatile__ (
 	"	syscall					\n"
 	: "=r" (_num), "=r" (_arg3)
 	: "r" (_num), "r" (_arg0), "r" (_arg1), "r" (_arg2), "r" (_arg3));

	set_fs(old_fs);

	/* $a3 is error flag */
	if (_arg3)
		return -_num;

	return _num;
}

static int translate_syscall_command(int cmd)
{
	int i;
	int ret = -1;

	for (i = 0; i < ARRAY_SIZE(syscall_command_table); i++) {
		if ((cmd == syscall_command_table[i].sp))
			return syscall_command_table[i].ap;
	}

	return ret;
}

static unsigned int translate_open_flags(int flags)
{
	int i;
	unsigned int ret = 0;

	for (i = 0; i < (sizeof(open_flags_table) / sizeof(struct apsp_table));
	     i++) {
		if( (flags & open_flags_table[i].sp) ) {
			ret |= open_flags_table[i].ap;
		}
	}

	return ret;
}


static void sp_setfsuidgid( uid_t uid, gid_t gid)
{
	current->fsuid = uid;
	current->fsgid = gid;

	key_fsuid_changed(current);
	key_fsgid_changed(current);
}

/*
 * Expects a request to be on the sysio channel. Reads it.  Decides whether
 * its a linux syscall and runs it, or whatever.  Puts the return code back
 * into the request and sends the whole thing back.
 */
void sp_work_handle_request(void)
{
	struct mtsp_syscall sc;
	struct mtsp_syscall_generic generic;
	struct mtsp_syscall_ret ret;
	struct kspd_notifications *n;
	unsigned long written;
	mm_segment_t old_fs;
	struct timeval tv;
	struct timezone tz;
	int cmd;

	char *vcwd;
	mm_segment_t old_fs;
	int size;

	ret.retval = -1;

	old_fs = get_fs();
	set_fs(KERNEL_DS);

	if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall))) {
		set_fs(old_fs);
		printk(KERN_ERR "Expected request but nothing to read\n");
		return;
	}

	size = sc.size;

	if (size) {
		if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size)) {
			set_fs(old_fs);
			printk(KERN_ERR "Expected request but nothing to read\n");
			return;
		}
	}

	/* Run the syscall at the priviledge of the user who loaded the
	   SP program */

	if (vpe_getuid(SP_VPE))
		sp_setfsuidgid( vpe_getuid(SP_VPE), vpe_getgid(SP_VPE));

	switch (sc.cmd) {
	/* needs the flags argument translating from SDE kit to
	   linux */
 	case MTSP_SYSCALL_PIPEFREQ:
 		ret.retval = cpu_khz * 1000;
 		ret.errno = 0;
 		break;

 	case MTSP_SYSCALL_GETTOD:
 		memset(&tz, 0, sizeof(tz));
 		if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv,
 		                             (int)&tz, 0,0)) == 0)
		ret.retval = tv.tv_sec;

		ret.errno = errno;
		break;

 	case MTSP_SYSCALL_EXIT:
		list_for_each_entry(n, &kspd_notifylist, list)
 			n->kspd_sp_exit(SP_VPE);
		sp_stopping = 1;

		printk(KERN_DEBUG "KSPD got exit syscall from SP exitcode %d\n",
		       generic.arg0);
 		break;

 	case MTSP_SYSCALL_OPEN:
 		generic.arg1 = translate_open_flags(generic.arg1);

 		vcwd = vpe_getcwd(SP_VPE);

 		/* change to the cwd of the process that loaded the SP program */
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		sys_chdir(vcwd);
		set_fs(old_fs);

 		sc.cmd = __NR_open;

		/* fall through */

  	default:
 		if ((sc.cmd >= __NR_Linux) &&
		    (sc.cmd <= (__NR_Linux +  __NR_Linux_syscalls)) )
			cmd = sc.cmd;
		else
			cmd = translate_syscall_command(sc.cmd);

		if (cmd >= 0) {
			ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1,
			                        generic.arg2, generic.arg3);
			ret.errno = errno;
		} else
 			printk(KERN_WARNING
			       "KSPD: Unknown SP syscall number %d\n", sc.cmd);
		break;
 	} /* switch */

	if (vpe_getuid(SP_VPE))
		sp_setfsuidgid( 0, 0);

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	written = rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(ret));
	set_fs(old_fs);
	if (written < sizeof(ret))
		printk("KSPD: sp_work_handle_request failed to send to SP\n");
}

static void sp_cleanup(void)
{
	struct files_struct *files = current->files;
	int i, j;
	struct fdtable *fdt;

	j = 0;

	/*
	 * It is safe to dereference the fd table without RCU or
	 * ->file_lock
	 */
	fdt = files_fdtable(files);
	for (;;) {
		unsigned long set;
		i = j * __NFDBITS;
		if (i >= fdt->max_fds)
			break;
		set = fdt->open_fds->fds_bits[j++];
		while (set) {
			if (set & 1) {
				struct file * file = xchg(&fdt->fd[i], NULL);
				if (file)
					filp_close(file, files);
			}
			i++;
			set >>= 1;
		}
	}
}

static int channel_open = 0;

/* the work handler */
static void sp_work(struct work_struct *unused)
{
	if (!channel_open) {
		if( rtlx_open(RTLX_CHANNEL_SYSIO, 1) != 0) {
			printk("KSPD: unable to open sp channel\n");
			sp_stopping = 1;
		} else {
			channel_open++;
			printk(KERN_DEBUG "KSPD: SP channel opened\n");
		}
	} else {
		/* wait for some data, allow it to sleep */
		rtlx_read_poll(RTLX_CHANNEL_SYSIO, 1);

		/* Check we haven't been woken because we are stopping */
		if (!sp_stopping)
			sp_work_handle_request();
	}

	if (!sp_stopping)
		queue_work(workqueue, &work);
	else
		sp_cleanup();
}

static void startwork(int vpe)
{
	sp_stopping = channel_open = 0;

	if (workqueue == NULL) {
		if ((workqueue = create_singlethread_workqueue("kspd")) == NULL) {
			printk(KERN_ERR "unable to start kspd\n");
			return;
		}

		INIT_WORK(&work, sp_work);
		queue_work(workqueue, &work);
	} else
		queue_work(workqueue, &work);

}

static void stopwork(int vpe)
{
	sp_stopping = 1;

	printk(KERN_DEBUG "KSPD: SP stopping\n");
}

void kspd_notify(struct kspd_notifications *notify)
{
	list_add(&notify->list, &kspd_notifylist);
}

static struct vpe_notifications notify;
static int kspd_module_init(void)
{
	INIT_LIST_HEAD(&kspd_notifylist);

	notify.start = startwork;
	notify.stop = stopwork;
	vpe_notify(SP_VPE, &notify);

	return 0;
}

static void kspd_module_exit(void)
{

}

module_init(kspd_module_init);
module_exit(kspd_module_exit);

MODULE_DESCRIPTION("MIPS KSPD");
MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
MODULE_LICENSE("GPL");
Commit	Line	Data
2600990e RB	1	/*
	2	* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
	3	*
	4	* This program is free software; you can distribute it and/or modify it
	5	* under the terms of the GNU General Public License (Version 2) as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	11	* for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	16	*
	17	*/
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/unistd.h>
	21	#include <linux/file.h>
	22	#include <linux/fs.h>
	23	#include <linux/syscalls.h>
	24	#include <linux/workqueue.h>
	25	#include <linux/errno.h>
	26	#include <linux/list.h>
	27
	28	#include <asm/vpe.h>
	29	#include <asm/rtlx.h>
	30	#include <asm/kspd.h>
	31
	32	static struct workqueue_struct *workqueue = NULL;
	33	static struct work_struct work;
	34
	35	extern unsigned long cpu_khz;
	36
	37	struct mtsp_syscall {
	38	int cmd;
	39	unsigned char abi;
	40	unsigned char size;
	41	};
	42
	43	struct mtsp_syscall_ret {
	44	int retval;
	45	int errno;
	46	};
	47
	48	struct mtsp_syscall_generic {
	49	int arg0;
	50	int arg1;
	51	int arg2;
	52	int arg3;
	53	int arg4;
	54	int arg5;
	55	int arg6;
	56	};
	57
	58	static struct list_head kspd_notifylist;
	59	static int sp_stopping = 0;
	60
	61	/* these should match with those in the SDE kit */
	62	#define MTSP_SYSCALL_BASE 0
	63	#define MTSP_SYSCALL_EXIT (MTSP_SYSCALL_BASE + 0)
	64	#define MTSP_SYSCALL_OPEN (MTSP_SYSCALL_BASE + 1)
65	#define MTSP_SYSCALL_READ (MTSP_SYSCALL_BASE + 2)
66	#define MTSP_SYSCALL_WRITE (MTSP_SYSCALL_BASE + 3)
67	#define MTSP_SYSCALL_CLOSE (MTSP_SYSCALL_BASE + 4)
68	#define MTSP_SYSCALL_LSEEK32 (MTSP_SYSCALL_BASE + 5)
69	#define MTSP_SYSCALL_ISATTY (MTSP_SYSCALL_BASE + 6)
70	#define MTSP_SYSCALL_GETTIME (MTSP_SYSCALL_BASE + 7)
71	#define MTSP_SYSCALL_PIPEFREQ (MTSP_SYSCALL_BASE + 8)
72	#define MTSP_SYSCALL_GETTOD (MTSP_SYSCALL_BASE + 9)
0e6ee854	73	#define MTSP_SYSCALL_IOCTL (MTSP_SYSCALL_BASE + 10)
2600990e RB	74
	75	#define MTSP_O_RDONLY 0x0000
	76	#define MTSP_O_WRONLY 0x0001
	77	#define MTSP_O_RDWR 0x0002
	78	#define MTSP_O_NONBLOCK 0x0004
	79	#define MTSP_O_APPEND 0x0008
	80	#define MTSP_O_SHLOCK 0x0010
	81	#define MTSP_O_EXLOCK 0x0020
	82	#define MTSP_O_ASYNC 0x0040
	83	#define MTSP_O_FSYNC O_SYNC
	84	#define MTSP_O_NOFOLLOW 0x0100
	85	#define MTSP_O_SYNC 0x0080
	86	#define MTSP_O_CREAT 0x0200
	87	#define MTSP_O_TRUNC 0x0400
	88	#define MTSP_O_EXCL 0x0800
	89	#define MTSP_O_BINARY 0x8000
	90
	91	#define SP_VPE 1
	92
	93	struct apsp_table {
	94	int sp;
	95	int ap;
	96	};
	97
	98	/* we might want to do the mode flags too */
	99	struct apsp_table open_flags_table[] = {
	100	{ MTSP_O_RDWR, O_RDWR },
	101	{ MTSP_O_WRONLY, O_WRONLY },
	102	{ MTSP_O_CREAT, O_CREAT },
	103	{ MTSP_O_TRUNC, O_TRUNC },
	104	{ MTSP_O_NONBLOCK, O_NONBLOCK },
	105	{ MTSP_O_APPEND, O_APPEND },
	106	{ MTSP_O_NOFOLLOW, O_NOFOLLOW }
	107	};
	108
	109	struct apsp_table syscall_command_table[] = {
	110	{ MTSP_SYSCALL_OPEN, __NR_open },
	111	{ MTSP_SYSCALL_CLOSE, __NR_close },
	112	{ MTSP_SYSCALL_READ, __NR_read },
	113	{ MTSP_SYSCALL_WRITE, __NR_write },
0e6ee854 RB	114	{ MTSP_SYSCALL_LSEEK32, __NR_lseek },
0e6ee854 RB	115	{ MTSP_SYSCALL_IOCTL, __NR_ioctl }
2600990e RB	116	};
	117
	118	static int sp_syscall(int num, int arg0, int arg1, int arg2, int arg3)
	119	{
	120	register long int _num __asm__ ("$2") = num;
	121	register long int _arg0 __asm__ ("$4") = arg0;
	122	register long int _arg1 __asm__ ("$5") = arg1;
	123	register long int _arg2 __asm__ ("$6") = arg2;
	124	register long int _arg3 __asm__ ("$7") = arg3;
	125
	126	mm_segment_t old_fs;
	127
	128	old_fs = get_fs();
	129	set_fs(KERNEL_DS);
	130
	131	__asm__ __volatile__ (
	132	" syscall \n"
	133	: "=r" (_num), "=r" (_arg3)
	134	: "r" (_num), "r" (_arg0), "r" (_arg1), "r" (_arg2), "r" (_arg3));
	135
	136	set_fs(old_fs);
	137
	138	/* $a3 is error flag */
	139	if (_arg3)
	140	return -_num;
	141
	142	return _num;
	143	}
	144
	145	static int translate_syscall_command(int cmd)
	146	{
	147	int i;
	148	int ret = -1;
	149
	150	for (i = 0; i < ARRAY_SIZE(syscall_command_table); i++) {
	151	if ((cmd == syscall_command_table[i].sp))
	152	return syscall_command_table[i].ap;
	153	}
	154
	155	return ret;
	156	}
	157
	158	static unsigned int translate_open_flags(int flags)
	159	{
	160	int i;
	161	unsigned int ret = 0;
	162
	163	for (i = 0; i < (sizeof(open_flags_table) / sizeof(struct apsp_table));
	164	i++) {
	165	if( (flags & open_flags_table[i].sp) ) {
	166	ret \|= open_flags_table[i].ap;
	167	}
	168	}
	169
	170	return ret;
	171	}
	172
	173
	174	static void sp_setfsuidgid( uid_t uid, gid_t gid)
	175	{
	176	current->fsuid = uid;
	177	current->fsgid = gid;
	178
	179	key_fsuid_changed(current);
180	key_fsgid_changed(current);
181	}
182
183	/*
184	* Expects a request to be on the sysio channel. Reads it. Decides whether
185	* its a linux syscall and runs it, or whatever. Puts the return code back
186	* into the request and sends the whole thing back.
187	*/
188	void sp_work_handle_request(void)
189	{
190	struct mtsp_syscall sc;
191	struct mtsp_syscall_generic generic;
192	struct mtsp_syscall_ret ret;
193	struct kspd_notifications *n;
46230aa6 RB	194	unsigned long written;
46230aa6 RB	195	mm_segment_t old_fs;
2600990e RB	196	struct timeval tv;
	197	struct timezone tz;
	198	int cmd;
	199
	200	char *vcwd;
	201	mm_segment_t old_fs;
	202	int size;
	203
	204	ret.retval = -1;
	205
46230aa6 RB	206	old_fs = get_fs();
	207	set_fs(KERNEL_DS);
	208
	209	if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall))) {
	210	set_fs(old_fs);
2600990e RB	211	printk(KERN_ERR "Expected request but nothing to read\n");
	212	return;
	213	}
	214
	215	size = sc.size;
	216
	217	if (size) {
46230aa6 RB	218	if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size)) {
46230aa6 RB	219	set_fs(old_fs);
2600990e RB	220	printk(KERN_ERR "Expected request but nothing to read\n");
	221	return;
	222	}
	223	}
	224
	225	/* Run the syscall at the priviledge of the user who loaded the
	226	SP program */
	227
	228	if (vpe_getuid(SP_VPE))
	229	sp_setfsuidgid( vpe_getuid(SP_VPE), vpe_getgid(SP_VPE));
	230
	231	switch (sc.cmd) {
	232	/* needs the flags argument translating from SDE kit to
	233	linux */
	234	case MTSP_SYSCALL_PIPEFREQ:
	235	ret.retval = cpu_khz * 1000;
	236	ret.errno = 0;
	237	break;
	238
	239	case MTSP_SYSCALL_GETTOD:
	240	memset(&tz, 0, sizeof(tz));
	241	if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv,
	242	(int)&tz, 0,0)) == 0)
	243	ret.retval = tv.tv_sec;
	244
	245	ret.errno = errno;
	246	break;
	247
	248	case MTSP_SYSCALL_EXIT:
	249	list_for_each_entry(n, &kspd_notifylist, list)
	250	n->kspd_sp_exit(SP_VPE);
	251	sp_stopping = 1;
	252
	253	printk(KERN_DEBUG "KSPD got exit syscall from SP exitcode %d\n",
	254	generic.arg0);
	255	break;
	256
	257	case MTSP_SYSCALL_OPEN:
	258	generic.arg1 = translate_open_flags(generic.arg1);
	259
	260	vcwd = vpe_getcwd(SP_VPE);
	261
	262	/* change to the cwd of the process that loaded the SP program */
	263	old_fs = get_fs();
	264	set_fs(KERNEL_DS);
	265	sys_chdir(vcwd);
	266	set_fs(old_fs);
	267
	268	sc.cmd = __NR_open;
	269
	270	/* fall through */
	271
	272	default:
	273	if ((sc.cmd >= __NR_Linux) &&
	274	(sc.cmd <= (__NR_Linux + __NR_Linux_syscalls)) )
	275	cmd = sc.cmd;
	276	else
	277	cmd = translate_syscall_command(sc.cmd);
	278
	279	if (cmd >= 0) {
	280	ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1,
	281	generic.arg2, generic.arg3);
	282	ret.errno = errno;
	283	} else
284	printk(KERN_WARNING
285	"KSPD: Unknown SP syscall number %d\n", sc.cmd);
286	break;
287	} /* switch */
288
289	if (vpe_getuid(SP_VPE))
290	sp_setfsuidgid( 0, 0);
291
46230aa6 RB	292	old_fs = get_fs();
	293	set_fs(KERNEL_DS);
	294	written = rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(ret));
	295	set_fs(old_fs);
	296	if (written < sizeof(ret))
2600990e RB	297	printk("KSPD: sp_work_handle_request failed to send to SP\n");
	298	}
	299
	300	static void sp_cleanup(void)
	301	{
	302	struct files_struct *files = current->files;
	303	int i, j;
	304	struct fdtable *fdt;
	305
	306	j = 0;
	307
	308	/*
	309	* It is safe to dereference the fd table without RCU or
	310	* ->file_lock
	311	*/
	312	fdt = files_fdtable(files);
	313	for (;;) {
	314	unsigned long set;
	315	i = j * __NFDBITS;
bbea9f69	316	if (i >= fdt->max_fds)
2600990e RB	317	break;
	318	set = fdt->open_fds->fds_bits[j++];
	319	while (set) {
	320	if (set & 1) {
	321	struct file * file = xchg(&fdt->fd[i], NULL);
	322	if (file)
	323	filp_close(file, files);
	324	}
	325	i++;
	326	set >>= 1;
	327	}
	328	}
	329	}
	330
	331	static int channel_open = 0;
	332
	333	/* the work handler */
6d5aefb8	334	static void sp_work(struct work_struct *unused)
2600990e RB	335	{
	336	if (!channel_open) {
	337	if( rtlx_open(RTLX_CHANNEL_SYSIO, 1) != 0) {
	338	printk("KSPD: unable to open sp channel\n");
	339	sp_stopping = 1;
	340	} else {
	341	channel_open++;
	342	printk(KERN_DEBUG "KSPD: SP channel opened\n");
	343	}
	344	} else {
	345	/* wait for some data, allow it to sleep */
	346	rtlx_read_poll(RTLX_CHANNEL_SYSIO, 1);
	347
	348	/* Check we haven't been woken because we are stopping */
	349	if (!sp_stopping)
	350	sp_work_handle_request();
	351	}
	352
	353	if (!sp_stopping)
	354	queue_work(workqueue, &work);
	355	else
	356	sp_cleanup();
	357	}
	358
	359	static void startwork(int vpe)
	360	{
	361	sp_stopping = channel_open = 0;
	362
	363	if (workqueue == NULL) {
	364	if ((workqueue = create_singlethread_workqueue("kspd")) == NULL) {
	365	printk(KERN_ERR "unable to start kspd\n");
	366	return;
	367	}
	368
6d5aefb8	369	INIT_WORK(&work, sp_work);
2600990e RB	370	queue_work(workqueue, &work);
	371	} else
	372	queue_work(workqueue, &work);
	373
	374	}
	375
	376	static void stopwork(int vpe)
	377	{
	378	sp_stopping = 1;
	379
	380	printk(KERN_DEBUG "KSPD: SP stopping\n");
	381	}
	382
	383	void kspd_notify(struct kspd_notifications *notify)
	384	{
	385	list_add(&notify->list, &kspd_notifylist);
	386	}
	387
	388	static struct vpe_notifications notify;
	389	static int kspd_module_init(void)
	390	{
	391	INIT_LIST_HEAD(&kspd_notifylist);
	392
	393	notify.start = startwork;
	394	notify.stop = stopwork;
	395	vpe_notify(SP_VPE, &notify);
	396
	397	return 0;
	398	}
	399
	400	static void kspd_module_exit(void)
	401	{
	402
	403	}
	404
	405	module_init(kspd_module_init);
	406	module_exit(kspd_module_exit);
	407
	408	MODULE_DESCRIPTION("MIPS KSPD");
	409	MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
	410	MODULE_LICENSE("GPL");