+++ /dev/null
-/*
- * 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/sched.h>
-#include <linux/unistd.h>
-#include <linux/file.h>
-#include <linux/fdtable.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;
-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;
-
-/* 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
-/* XXX: check which of these is actually O_SYNC vs O_DSYNC */
-#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
-
-extern int tclimit;
-
-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 < ARRAY_SIZE(open_flags_table); i++) {
- if( (flags & open_flags_table[i].sp) ) {
- ret |= open_flags_table[i].ap;
- }
- }
-
- return ret;
-}
-
-
-static int sp_setfsuidgid(uid_t uid, gid_t gid)
-{
- struct cred *new;
-
- new = prepare_creds();
- if (!new)
- return -ENOMEM;
-
- new->fsuid = uid;
- new->fsgid = gid;
-
- commit_creds(new);
-
- return 0;
-}
-
-/*
- * 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 err, cmd;
-
- char *vcwd;
- 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 privilege of the user who loaded the
- SP program */
-
- if (vpe_getuid(tclimit)) {
- err = sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit));
- if (!err)
- pr_err("Change of creds failed\n");
- }
-
- 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;
- break;
-
- case MTSP_SYSCALL_EXIT:
- list_for_each_entry(n, &kspd_notifylist, list)
- n->kspd_sp_exit(tclimit);
- 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(tclimit);
-
- /* change to 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);
- } else
- printk(KERN_WARNING
- "KSPD: Unknown SP syscall number %d\n", sc.cmd);
- break;
- } /* switch */
-
- if (vpe_getuid(tclimit)) {
- err = sp_setfsuidgid(0, 0);
- if (!err)
- pr_err("restoring old creds failed\n");
- }
-
- 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 * BITS_PER_LONG;
- if (i >= fdt->max_fds)
- break;
- set = fdt->open_fds[j++];
- while (set) {
- if (set & 1) {
- struct file * file = xchg(&fdt->fd[i], NULL);
- if (file)
- filp_close(file, files);
- }
- i++;
- set >>= 1;
- }
- }
-
- /* Put daemon cwd back to root to avoid umount problems */
- sys_chdir("/");
-}
-
-static int channel_open;
-
-/* 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);
-}
-
-static void stopwork(int vpe)
-{
- sp_stopping = 1;
-
- printk(KERN_DEBUG "KSPD: SP stopping\n");
-}
-
-void kspd_notify(struct kspd_notifications *notify)
-{
- list_add(¬ify->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(tclimit, ¬ify);
-
- 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");
projects / ~emulex / infiniband.git / commitdiff