Commit 2600990e authored by Ralf Baechle's avatar Ralf Baechle
Browse files

[MIPS] kpsd and other AP/SP improvements.


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent bce1a286
......@@ -1476,6 +1476,16 @@ config MIPS_VPE_APSP_API
depends on MIPS_VPE_LOADER
help
config MIPS_APSP_KSPD
bool "Enable KSPD"
depends on MIPS_VPE_APSP_API
default y
help
KSPD is a kernel daemon that accepts syscall requests from the SP
side, actions them and returns the results. It also handles the
"exit" syscall notifying other kernel modules the SP program is
exiting. You probably want to say yes here.
config SB1_PASS_1_WORKAROUNDS
bool
depends on CPU_SB1_PASS_1
......
......@@ -36,6 +36,7 @@ obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_MIPS_MT_SMP) += smp_mt.o
obj-$(CONFIG_MIPS_APSP_KSPD) += kspd.o
obj-$(CONFIG_MIPS_VPE_LOADER) += vpe.o
obj-$(CONFIG_MIPS_VPE_APSP_API) += rtlx.o
......
/*
* 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_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 }
};
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;
struct timeval tv;
struct timezone tz;
int cmd;
char *vcwd;
mm_segment_t old_fs;
int size;
ret.retval = -1;
if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall), 0)) {
printk(KERN_ERR "Expected request but nothing to read\n");
return;
}
size = sc.size;
if (size) {
if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size, 0)) {
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);
if ((rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(struct mtsp_syscall_ret), 0))
< sizeof(struct mtsp_syscall_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_fdset || 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(void *data)
{
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, NULL);
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");
......@@ -21,45 +21,44 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
#include <linux/elf.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/moduleloader.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <asm/mipsmtregs.h>
#include <asm/bitops.h>
#include <asm/cacheflush.h>
#include <asm/atomic.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/vpe.h>
#include <asm/rtlx.h>
#include <asm/uaccess.h>
#define RTLX_TARG_VPE 1
static struct rtlx_info *rtlx;
static int major;
static char module_name[] = "rtlx";
static struct irqaction irq;
static int irq_num;
static inline int spacefree(int read, int write, int size)
{
if (read == write) {
/*
* never fill the buffer completely, so indexes are always
* equal if empty and only empty, or !equal if data available
*/
return size - 1;
}
return ((read + size - write) % size) - 1;
}
static struct chan_waitqueues {
wait_queue_head_t rt_queue;
wait_queue_head_t lx_queue;
int in_open;
} channel_wqs[RTLX_CHANNELS];
static struct irqaction irq;
static int irq_num;
static struct vpe_notifications notify;
static int sp_stopping = 0;
extern void *vpe_get_shared(int index);
static void rtlx_dispatch(struct pt_regs *regs)
......@@ -67,174 +66,298 @@ static void rtlx_dispatch(struct pt_regs *regs)
do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ, regs);
}
/* Interrupt handler may be called before rtlx_init has otherwise had
a chance to run.
*/
static irqreturn_t rtlx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
int i;
for (i = 0; i < RTLX_CHANNELS; i++) {
struct rtlx_channel *chan = &rtlx->channel[i];
if (chan->lx_read != chan->lx_write)
wake_up_interruptible(&channel_wqs[i].lx_queue);
wake_up(&channel_wqs[i].lx_queue);
wake_up(&channel_wqs[i].rt_queue);
}
return IRQ_HANDLED;
}
/* call when we have the address of the shared structure from the SP side. */
static int rtlx_init(struct rtlx_info *rtlxi)
static __attribute_used__ void dump_rtlx(void)
{
int i;
if (rtlxi->id != RTLX_ID) {
printk(KERN_WARNING "no valid RTLX id at 0x%p\n", rtlxi);
return -ENOEXEC;
}
printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
/* initialise the wait queues */
for (i = 0; i < RTLX_CHANNELS; i++) {
init_waitqueue_head(&channel_wqs[i].rt_queue);
init_waitqueue_head(&channel_wqs[i].lx_queue);
}
struct rtlx_channel *chan = &rtlx->channel[i];
/* set up for interrupt handling */
memset(&irq, 0, sizeof(struct irqaction));
printk(" rt_state %d lx_state %d buffer_size %d\n",
chan->rt_state, chan->lx_state, chan->buffer_size);
if (cpu_has_vint)
set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
printk(" rt_read %d rt_write %d\n",
chan->rt_read, chan->rt_write);
irq_num = MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ;
irq.handler = rtlx_interrupt;
irq.flags = SA_INTERRUPT;
irq.name = "RTLX";
irq.dev_id = rtlx;
setup_irq(irq_num, &irq);
printk(" lx_read %d lx_write %d\n",
chan->lx_read, chan->lx_write);
printk(" rt_buffer <%s>\n", chan->rt_buffer);
printk(" lx_buffer <%s>\n", chan->lx_buffer);
}
}
/* call when we have the address of the shared structure from the SP side. */
static int rtlx_init(struct rtlx_info *rtlxi)
{
if (rtlxi->id != RTLX_ID) {
printk(KERN_ERR "no valid RTLX id at 0x%p 0x%x\n", rtlxi, rtlxi->id);
return -ENOEXEC;
}
rtlx = rtlxi;
return 0;
}
/* only allow one open process at a time to open each channel */
static int rtlx_open(struct inode *inode, struct file *filp)
/* notifications */
static void starting(int vpe)
{
int minor, ret;
int i;
sp_stopping = 0;
/* force a reload of rtlx */
rtlx=NULL;
/* wake up any sleeping rtlx_open's */
for (i = 0; i < RTLX_CHANNELS; i++)
wake_up_interruptible(&channel_wqs[i].lx_queue);
}
static void stopping(int vpe)
{
int i;
sp_stopping = 1;
for (i = 0; i < RTLX_CHANNELS; i++)
wake_up_interruptible(&channel_wqs[i].lx_queue);
}
int rtlx_open(int index, int can_sleep)
{
int ret;
struct rtlx_channel *chan;
volatile struct rtlx_info **p;
/* assume only 1 device at the mo. */
minor = MINOR(inode->i_rdev);
if (index >= RTLX_CHANNELS) {
printk(KERN_DEBUG "rtlx_open index out of range\n");
return -ENOSYS;
}
if (channel_wqs[index].in_open) {
printk(KERN_DEBUG "rtlx_open channel %d already opened\n", index);
return -EBUSY;
}
channel_wqs[index].in_open++;
if (rtlx == NULL) {
struct rtlx_info **p;
if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
printk(KERN_ERR "vpe_get_shared is NULL. "
"Has an SP program been loaded?\n");
return -EFAULT;
if (can_sleep) {
DECLARE_WAITQUEUE(wait, current);
/* go to sleep */
add_wait_queue(&channel_wqs[index].lx_queue, &wait);
set_current_state(TASK_INTERRUPTIBLE);
while ((p = vpe_get