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-rw-r--r--arch/mips/kernel/rtlx.c485
1 files changed, 176 insertions, 309 deletions
diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c
index 8c8c8324f77..31b1b763cb2 100644
--- a/arch/mips/kernel/rtlx.c
+++ b/arch/mips/kernel/rtlx.c
@@ -1,107 +1,51 @@
/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
* Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org)
- *
- * 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.
- *
+ * Copyright (C) 2013 Imagination Technologies Ltd.
*/
-
#include <linux/kernel.h>
-#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/poll.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
+#include <linux/atomic.h>
#include <asm/mipsmtregs.h>
-#include <asm/cacheflush.h>
-#include <asm/atomic.h>
-#include <asm/cpu.h>
+#include <asm/mips_mt.h>
#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/vpe.h>
#include <asm/rtlx.h>
+#include <asm/setup.h>
+#include <asm/vpe.h>
-#define RTLX_TARG_VPE 1
-
-static struct rtlx_info *rtlx;
-static int major;
-static char module_name[] = "rtlx";
-
-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(void)
-{
- do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ);
-}
-
-
-/* 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)
-{
- int i;
-
- for (i = 0; i < RTLX_CHANNELS; i++) {
- wake_up(&channel_wqs[i].lx_queue);
- wake_up(&channel_wqs[i].rt_queue);
- }
-
- return IRQ_HANDLED;
-}
+static int sp_stopping;
+struct rtlx_info *rtlx;
+struct chan_waitqueues channel_wqs[RTLX_CHANNELS];
+struct vpe_notifications rtlx_notify;
+void (*aprp_hook)(void) = NULL;
+EXPORT_SYMBOL(aprp_hook);
-static __attribute_used__ void dump_rtlx(void)
+static void __used dump_rtlx(void)
{
int i;
- printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
+ pr_info("id 0x%lx state %d\n", rtlx->id, rtlx->state);
for (i = 0; i < RTLX_CHANNELS; i++) {
struct rtlx_channel *chan = &rtlx->channel[i];
- printk(" rt_state %d lx_state %d buffer_size %d\n",
- chan->rt_state, chan->lx_state, chan->buffer_size);
+ pr_info(" rt_state %d lx_state %d buffer_size %d\n",
+ chan->rt_state, chan->lx_state, chan->buffer_size);
- printk(" rt_read %d rt_write %d\n",
- chan->rt_read, chan->rt_write);
+ pr_info(" rt_read %d rt_write %d\n",
+ chan->rt_read, chan->rt_write);
- printk(" lx_read %d lx_write %d\n",
- chan->lx_read, chan->lx_write);
+ pr_info(" 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);
+ pr_info(" rt_buffer <%s>\n", chan->rt_buffer);
+ pr_info(" lx_buffer <%s>\n", chan->lx_buffer);
}
}
@@ -109,7 +53,7 @@ static __attribute_used__ void dump_rtlx(void)
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);
+ pr_err("no valid RTLX id at 0x%p 0x%lx\n", rtlxi, rtlxi->id);
return -ENOEXEC;
}
@@ -119,20 +63,20 @@ static int rtlx_init(struct rtlx_info *rtlxi)
}
/* notifications */
-static void starting(int vpe)
+void rtlx_starting(int vpe)
{
int i;
sp_stopping = 0;
/* force a reload of rtlx */
- rtlx=NULL;
+ 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)
+void rtlx_stopping(int vpe)
{
int i;
@@ -144,154 +88,127 @@ static void stopping(int vpe)
int rtlx_open(int index, int can_sleep)
{
- int ret;
+ struct rtlx_info **p;
struct rtlx_channel *chan;
- volatile struct rtlx_info **p;
+ enum rtlx_state state;
+ int ret = 0;
if (index >= RTLX_CHANNELS) {
- printk(KERN_DEBUG "rtlx_open index out of range\n");
+ pr_debug(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;
+ if (atomic_inc_return(&channel_wqs[index].in_open) > 1) {
+ pr_debug(KERN_DEBUG "rtlx_open channel %d already opened\n", index);
+ ret = -EBUSY;
+ goto out_fail;
}
- channel_wqs[index].in_open++;
-
if (rtlx == NULL) {
- if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
+ p = vpe_get_shared(aprp_cpu_index());
+ if (p == NULL) {
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_shared(RTLX_TARG_VPE)) == NULL) {
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
- }
-
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
-
- /* back running */
+ ret = __wait_event_interruptible(
+ channel_wqs[index].lx_queue,
+ (p = vpe_get_shared(aprp_cpu_index())));
+ if (ret)
+ goto out_fail;
} else {
- printk( KERN_DEBUG "No SP program loaded, and device "
- "opened with O_NONBLOCK\n");
- channel_wqs[index].in_open = 0;
- return -ENOSYS;
+ pr_debug("No SP program loaded, and device opened with O_NONBLOCK\n");
+ ret = -ENOSYS;
+ goto out_fail;
}
}
+ smp_rmb();
if (*p == NULL) {
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 == NULL) {
- schedule();
-
- /* reset task state to interruptable otherwise
- we'll whizz round here like a very fast loopy
- thing. schedule() appears to return with state
- set to TASK_RUNNING.
-
- If the loaded SP program, for whatever reason,
- doesn't set up the shared structure *p will never
- become true. So whoever connected to either /dev/rt?
- or if it was kspd, will then take up rather a lot of
- processor cycles.
- */
-
- set_current_state(TASK_INTERRUPTIBLE);
+ DEFINE_WAIT(wait);
+
+ for (;;) {
+ prepare_to_wait(
+ &channel_wqs[index].lx_queue,
+ &wait, TASK_INTERRUPTIBLE);
+ smp_rmb();
+ if (*p != NULL)
+ break;
+ if (!signal_pending(current)) {
+ schedule();
+ continue;
+ }
+ ret = -ERESTARTSYS;
+ goto out_fail;
}
-
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
-
- /* back running */
- }
- else {
- printk(" *vpe_get_shared is NULL. "
- "Has an SP program been loaded?\n");
- channel_wqs[index].in_open = 0;
- return -ENOSYS;
+ finish_wait(&channel_wqs[index].lx_queue,
+ &wait);
+ } else {
+ pr_err(" *vpe_get_shared is NULL. Has an SP program been loaded?\n");
+ ret = -ENOSYS;
+ goto out_fail;
}
}
if ((unsigned int)*p < KSEG0) {
- printk(KERN_WARNING "vpe_get_shared returned an invalid pointer "
- "maybe an error code %d\n", (int)*p);
- channel_wqs[index].in_open = 0;
- return -ENOSYS;
+ pr_warn("vpe_get_shared returned an invalid pointer maybe an error code %d\n",
+ (int)*p);
+ ret = -ENOSYS;
+ goto out_fail;
}
- if ((ret = rtlx_init(*p)) < 0) {
- channel_wqs[index].in_open = 0;
- return ret;
- }
+ ret = rtlx_init(*p);
+ if (ret < 0)
+ goto out_ret;
}
chan = &rtlx->channel[index];
- if (chan->lx_state == RTLX_STATE_OPENED) {
- channel_wqs[index].in_open = 0;
- return -EBUSY;
- }
+ state = xchg(&chan->lx_state, RTLX_STATE_OPENED);
+ if (state == RTLX_STATE_OPENED) {
+ ret = -EBUSY;
+ goto out_fail;
+ }
- chan->lx_state = RTLX_STATE_OPENED;
- channel_wqs[index].in_open = 0;
- return 0;
+out_fail:
+ smp_mb();
+ atomic_dec(&channel_wqs[index].in_open);
+ smp_mb();
+
+out_ret:
+ return ret;
}
int rtlx_release(int index)
{
+ if (rtlx == NULL) {
+ pr_err("rtlx_release() with null rtlx\n");
+ return 0;
+ }
rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
return 0;
}
unsigned int rtlx_read_poll(int index, int can_sleep)
{
- struct rtlx_channel *chan;
+ struct rtlx_channel *chan;
- if (rtlx == NULL)
- return 0;
+ if (rtlx == NULL)
+ return 0;
- chan = &rtlx->channel[index];
+ chan = &rtlx->channel[index];
/* data available to read? */
if (chan->lx_read == chan->lx_write) {
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 (chan->lx_read == chan->lx_write) {
- schedule();
-
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (sp_stopping) {
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
- return 0;
- }
- }
-
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
-
- /* back running */
- }
- else
+ int ret = __wait_event_interruptible(
+ channel_wqs[index].lx_queue,
+ (chan->lx_read != chan->lx_write) ||
+ sp_stopping);
+ if (ret)
+ return ret;
+
+ if (sp_stopping)
+ return 0;
+ } else
return 0;
}
@@ -315,108 +232,113 @@ static inline int write_spacefree(int read, int write, int size)
unsigned int rtlx_write_poll(int index)
{
struct rtlx_channel *chan = &rtlx->channel[index];
- return write_spacefree(chan->rt_read, chan->rt_write, chan->buffer_size);
-}
-
-static inline void copy_to(void *dst, void *src, size_t count, int user)
-{
- if (user)
- copy_to_user(dst, src, count);
- else
- memcpy(dst, src, count);
-}
-static inline void copy_from(void *dst, void *src, size_t count, int user)
-{
- if (user)
- copy_from_user(dst, src, count);
- else
- memcpy(dst, src, count);
+ return write_spacefree(chan->rt_read, chan->rt_write,
+ chan->buffer_size);
}
-ssize_t rtlx_read(int index, void *buff, size_t count, int user)
+ssize_t rtlx_read(int index, void __user *buff, size_t count)
{
- size_t fl = 0L;
+ size_t lx_write, fl = 0L;
struct rtlx_channel *lx;
+ unsigned long failed;
if (rtlx == NULL)
return -ENOSYS;
lx = &rtlx->channel[index];
+ mutex_lock(&channel_wqs[index].mutex);
+ smp_rmb();
+ lx_write = lx->lx_write;
+
/* find out how much in total */
count = min(count,
- (size_t)(lx->lx_write + lx->buffer_size - lx->lx_read)
+ (size_t)(lx_write + lx->buffer_size - lx->lx_read)
% lx->buffer_size);
/* then how much from the read pointer onwards */
- fl = min( count, (size_t)lx->buffer_size - lx->lx_read);
+ fl = min(count, (size_t)lx->buffer_size - lx->lx_read);
- copy_to(buff, &lx->lx_buffer[lx->lx_read], fl, user);
+ failed = copy_to_user(buff, lx->lx_buffer + lx->lx_read, fl);
+ if (failed)
+ goto out;
/* and if there is anything left at the beginning of the buffer */
- if ( count - fl )
- copy_to (buff + fl, lx->lx_buffer, count - fl, user);
+ if (count - fl)
+ failed = copy_to_user(buff + fl, lx->lx_buffer, count - fl);
+
+out:
+ count -= failed;
- /* update the index */
- lx->lx_read += count;
- lx->lx_read %= lx->buffer_size;
+ smp_wmb();
+ lx->lx_read = (lx->lx_read + count) % lx->buffer_size;
+ smp_wmb();
+ mutex_unlock(&channel_wqs[index].mutex);
return count;
}
-ssize_t rtlx_write(int index, void *buffer, size_t count, int user)
+ssize_t rtlx_write(int index, const void __user *buffer, size_t count)
{
struct rtlx_channel *rt;
+ unsigned long failed;
+ size_t rt_read;
size_t fl;
if (rtlx == NULL)
- return(-ENOSYS);
+ return -ENOSYS;
rt = &rtlx->channel[index];
+ mutex_lock(&channel_wqs[index].mutex);
+ smp_rmb();
+ rt_read = rt->rt_read;
+
/* total number of bytes to copy */
- count = min(count,
- (size_t)write_spacefree(rt->rt_read, rt->rt_write,
- rt->buffer_size));
+ count = min_t(size_t, count, write_spacefree(rt_read, rt->rt_write,
+ rt->buffer_size));
/* first bit from write pointer to the end of the buffer, or count */
fl = min(count, (size_t) rt->buffer_size - rt->rt_write);
- copy_from (&rt->rt_buffer[rt->rt_write], buffer, fl, user);
+ failed = copy_from_user(rt->rt_buffer + rt->rt_write, buffer, fl);
+ if (failed)
+ goto out;
/* if there's any left copy to the beginning of the buffer */
- if( count - fl )
- copy_from (rt->rt_buffer, buffer + fl, count - fl, user);
+ if (count - fl)
+ failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
+
+out:
+ count -= failed;
- rt->rt_write += count;
- rt->rt_write %= rt->buffer_size;
+ smp_wmb();
+ rt->rt_write = (rt->rt_write + count) % rt->buffer_size;
+ smp_wmb();
+ mutex_unlock(&channel_wqs[index].mutex);
- return(count);
+ _interrupt_sp();
+
+ return count;
}
static int file_open(struct inode *inode, struct file *filp)
{
- int minor = iminor(inode);
-
- return rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1);
+ return rtlx_open(iminor(inode), (filp->f_flags & O_NONBLOCK) ? 0 : 1);
}
static int file_release(struct inode *inode, struct file *filp)
{
- int minor = iminor(inode);
-
- return rtlx_release(minor);
+ return rtlx_release(iminor(inode));
}
-static unsigned int file_poll(struct file *file, poll_table * wait)
+static unsigned int file_poll(struct file *file, poll_table *wait)
{
- int minor;
+ int minor = iminor(file_inode(file));
unsigned int mask = 0;
- minor = iminor(file->f_dentry->d_inode);
-
poll_wait(file, &channel_wqs[minor].rt_queue, wait);
poll_wait(file, &channel_wqs[minor].lx_queue, wait);
@@ -434,104 +356,49 @@ static unsigned int file_poll(struct file *file, poll_table * wait)
return mask;
}
-static ssize_t file_read(struct file *file, char __user * buffer, size_t count,
- loff_t * ppos)
+static ssize_t file_read(struct file *file, char __user *buffer, size_t count,
+ loff_t *ppos)
{
- int minor = iminor(file->f_dentry->d_inode);
+ int minor = iminor(file_inode(file));
/* data available? */
- if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) {
- return 0; // -EAGAIN makes cat whinge
- }
+ if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1))
+ return 0; /* -EAGAIN makes 'cat' whine */
- return rtlx_read(minor, buffer, count, 1);
+ return rtlx_read(minor, buffer, count);
}
-static ssize_t file_write(struct file *file, const char __user * buffer,
- size_t count, loff_t * ppos)
+static ssize_t file_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
{
- int minor;
- struct rtlx_channel *rt;
- DECLARE_WAITQUEUE(wait, current);
-
- minor = iminor(file->f_dentry->d_inode);
- rt = &rtlx->channel[minor];
+ int minor = iminor(file_inode(file));
/* any space left... */
if (!rtlx_write_poll(minor)) {
+ int ret;
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
- add_wait_queue(&channel_wqs[minor].rt_queue, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
-
- while (!rtlx_write_poll(minor))
- schedule();
-
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&channel_wqs[minor].rt_queue, &wait);
+ ret = __wait_event_interruptible(channel_wqs[minor].rt_queue,
+ rtlx_write_poll(minor));
+ if (ret)
+ return ret;
}
- return rtlx_write(minor, (void *)buffer, count, 1);
+ return rtlx_write(minor, buffer, count);
}
-static struct file_operations rtlx_fops = {
+const struct file_operations rtlx_fops = {
.owner = THIS_MODULE,
.open = file_open,
.release = file_release,
.write = file_write,
.read = file_read,
- .poll = file_poll
+ .poll = file_poll,
+ .llseek = noop_llseek,
};
-static struct irqaction rtlx_irq = {
- .handler = rtlx_interrupt,
- .flags = IRQF_DISABLED,
- .name = "RTLX",
-};
-
-static int rtlx_irq_num = MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ;
-
-static char register_chrdev_failed[] __initdata =
- KERN_ERR "rtlx_module_init: unable to register device\n";
-
-static int rtlx_module_init(void)
-{
- int i;
-
- major = register_chrdev(0, module_name, &rtlx_fops);
- if (major < 0) {
- printk(register_chrdev_failed);
- return major;
- }
-
- /* 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);
- channel_wqs[i].in_open = 0;
- }
-
- /* set up notifiers */
- notify.start = starting;
- notify.stop = stopping;
- vpe_notify(RTLX_TARG_VPE, &notify);
-
- if (cpu_has_vint)
- set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
-
- rtlx_irq.dev_id = rtlx;
- setup_irq(rtlx_irq_num, &rtlx_irq);
-
- return 0;
-}
-
-static void __exit rtlx_module_exit(void)
-{
- unregister_chrdev(major, module_name);
-}
-
module_init(rtlx_module_init);
module_exit(rtlx_module_exit);
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