[MIPS] kpsd and other AP/SP improvements.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
@ -21,45 +21,44 @@
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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#include <linux/elf.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/moduleloader.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <asm/mipsmtregs.h>
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#include <asm/bitops.h>
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#include <asm/cacheflush.h>
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#include <asm/atomic.h>
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#include <asm/cpu.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/vpe.h>
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#include <asm/rtlx.h>
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#include <asm/uaccess.h>
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#define RTLX_TARG_VPE 1
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static struct rtlx_info *rtlx;
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static int major;
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static char module_name[] = "rtlx";
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static struct irqaction irq;
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static int irq_num;
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static inline int spacefree(int read, int write, int size)
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{
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if (read == write) {
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/*
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* never fill the buffer completely, so indexes are always
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* equal if empty and only empty, or !equal if data available
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*/
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return size - 1;
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}
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return ((read + size - write) % size) - 1;
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}
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static struct chan_waitqueues {
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wait_queue_head_t rt_queue;
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wait_queue_head_t lx_queue;
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int in_open;
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} channel_wqs[RTLX_CHANNELS];
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static struct irqaction irq;
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static int irq_num;
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static struct vpe_notifications notify;
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static int sp_stopping = 0;
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extern void *vpe_get_shared(int index);
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static void rtlx_dispatch(struct pt_regs *regs)
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@ -67,174 +66,298 @@ static void rtlx_dispatch(struct pt_regs *regs)
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do_IRQ(MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ, regs);
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}
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/* Interrupt handler may be called before rtlx_init has otherwise had
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a chance to run.
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*/
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static irqreturn_t rtlx_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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int i;
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for (i = 0; i < RTLX_CHANNELS; i++) {
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struct rtlx_channel *chan = &rtlx->channel[i];
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if (chan->lx_read != chan->lx_write)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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wake_up(&channel_wqs[i].lx_queue);
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wake_up(&channel_wqs[i].rt_queue);
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}
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return IRQ_HANDLED;
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}
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/* call when we have the address of the shared structure from the SP side. */
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static int rtlx_init(struct rtlx_info *rtlxi)
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static __attribute_used__ void dump_rtlx(void)
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{
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int i;
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printk("id 0x%lx state %d\n", rtlx->id, rtlx->state);
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for (i = 0; i < RTLX_CHANNELS; i++) {
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struct rtlx_channel *chan = &rtlx->channel[i];
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printk(" rt_state %d lx_state %d buffer_size %d\n",
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chan->rt_state, chan->lx_state, chan->buffer_size);
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printk(" rt_read %d rt_write %d\n",
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chan->rt_read, chan->rt_write);
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printk(" lx_read %d lx_write %d\n",
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chan->lx_read, chan->lx_write);
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printk(" rt_buffer <%s>\n", chan->rt_buffer);
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printk(" lx_buffer <%s>\n", chan->lx_buffer);
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}
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}
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/* call when we have the address of the shared structure from the SP side. */
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static int rtlx_init(struct rtlx_info *rtlxi)
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{
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if (rtlxi->id != RTLX_ID) {
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printk(KERN_WARNING "no valid RTLX id at 0x%p\n", rtlxi);
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printk(KERN_ERR "no valid RTLX id at 0x%p 0x%x\n", rtlxi, rtlxi->id);
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return -ENOEXEC;
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}
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/* initialise the wait queues */
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for (i = 0; i < RTLX_CHANNELS; i++) {
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init_waitqueue_head(&channel_wqs[i].rt_queue);
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init_waitqueue_head(&channel_wqs[i].lx_queue);
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}
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/* set up for interrupt handling */
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memset(&irq, 0, sizeof(struct irqaction));
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if (cpu_has_vint)
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set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch);
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irq_num = MIPSCPU_INT_BASE + MIPS_CPU_RTLX_IRQ;
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irq.handler = rtlx_interrupt;
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irq.flags = SA_INTERRUPT;
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irq.name = "RTLX";
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irq.dev_id = rtlx;
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setup_irq(irq_num, &irq);
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rtlx = rtlxi;
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return 0;
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}
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/* only allow one open process at a time to open each channel */
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static int rtlx_open(struct inode *inode, struct file *filp)
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/* notifications */
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static void starting(int vpe)
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{
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int minor, ret;
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struct rtlx_channel *chan;
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int i;
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sp_stopping = 0;
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/* assume only 1 device at the mo. */
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minor = MINOR(inode->i_rdev);
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/* force a reload of rtlx */
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rtlx=NULL;
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/* wake up any sleeping rtlx_open's */
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for (i = 0; i < RTLX_CHANNELS; i++)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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}
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static void stopping(int vpe)
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{
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int i;
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sp_stopping = 1;
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for (i = 0; i < RTLX_CHANNELS; i++)
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wake_up_interruptible(&channel_wqs[i].lx_queue);
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}
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int rtlx_open(int index, int can_sleep)
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{
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int ret;
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struct rtlx_channel *chan;
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volatile struct rtlx_info **p;
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if (index >= RTLX_CHANNELS) {
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printk(KERN_DEBUG "rtlx_open index out of range\n");
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return -ENOSYS;
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}
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if (channel_wqs[index].in_open) {
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printk(KERN_DEBUG "rtlx_open channel %d already opened\n", index);
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return -EBUSY;
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}
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channel_wqs[index].in_open++;
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if (rtlx == NULL) {
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struct rtlx_info **p;
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if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
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printk(KERN_ERR "vpe_get_shared is NULL. "
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"Has an SP program been loaded?\n");
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return -EFAULT;
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if (can_sleep) {
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DECLARE_WAITQUEUE(wait, current);
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/* go to sleep */
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add_wait_queue(&channel_wqs[index].lx_queue, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while ((p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) {
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schedule();
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set_current_state(TASK_INTERRUPTIBLE);
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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/* back running */
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} else {
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printk( KERN_DEBUG "No SP program loaded, and device "
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"opened with O_NONBLOCK\n");
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channel_wqs[index].in_open = 0;
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return -ENOSYS;
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}
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}
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if (*p == NULL) {
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printk(KERN_ERR "vpe_shared %p %p\n", p, *p);
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return -EFAULT;
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if (can_sleep) {
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DECLARE_WAITQUEUE(wait, current);
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/* go to sleep */
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add_wait_queue(&channel_wqs[index].lx_queue, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while (*p == NULL) {
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schedule();
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/* reset task state to interruptable otherwise
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we'll whizz round here like a very fast loopy
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thing. schedule() appears to return with state
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set to TASK_RUNNING.
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If the loaded SP program, for whatever reason,
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doesn't set up the shared structure *p will never
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become true. So whoever connected to either /dev/rt?
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or if it was kspd, will then take up rather a lot of
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processor cycles.
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*/
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set_current_state(TASK_INTERRUPTIBLE);
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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/* back running */
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}
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else {
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printk(" *vpe_get_shared is NULL. "
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"Has an SP program been loaded?\n");
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channel_wqs[index].in_open = 0;
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return -ENOSYS;
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}
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}
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if ((ret = rtlx_init(*p)) < 0)
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return ret;
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if ((unsigned int)*p < KSEG0) {
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printk(KERN_WARNING "vpe_get_shared returned an invalid pointer "
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"maybe an error code %d\n", (int)*p);
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channel_wqs[index].in_open = 0;
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return -ENOSYS;
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}
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if ((ret = rtlx_init(*p)) < 0) {
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channel_wqs[index].in_open = 0;
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return ret;
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}
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}
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chan = &rtlx->channel[minor];
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chan = &rtlx->channel[index];
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if (test_and_set_bit(RTLX_STATE_OPENED, &chan->lx_state))
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return -EBUSY;
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if (chan->lx_state == RTLX_STATE_OPENED) {
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channel_wqs[index].in_open = 0;
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return -EBUSY;
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}
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chan->lx_state = RTLX_STATE_OPENED;
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channel_wqs[index].in_open = 0;
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return 0;
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}
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static int rtlx_release(struct inode *inode, struct file *filp)
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int rtlx_release(int index)
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{
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int minor = MINOR(inode->i_rdev);
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clear_bit(RTLX_STATE_OPENED, &rtlx->channel[minor].lx_state);
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smp_mb__after_clear_bit();
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rtlx->channel[index].lx_state = RTLX_STATE_UNUSED;
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return 0;
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}
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static unsigned int rtlx_poll(struct file *file, poll_table * wait)
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unsigned int rtlx_read_poll(int index, int can_sleep)
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{
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int minor;
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unsigned int mask = 0;
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struct rtlx_channel *chan;
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struct rtlx_channel *chan;
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minor = MINOR(file->f_dentry->d_inode->i_rdev);
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chan = &rtlx->channel[minor];
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if (rtlx == NULL)
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return 0;
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poll_wait(file, &channel_wqs[minor].rt_queue, wait);
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poll_wait(file, &channel_wqs[minor].lx_queue, wait);
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chan = &rtlx->channel[index];
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/* data available to read? */
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if (chan->lx_read != chan->lx_write)
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mask |= POLLIN | POLLRDNORM;
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if (chan->lx_read == chan->lx_write) {
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if (can_sleep) {
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DECLARE_WAITQUEUE(wait, current);
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/* space to write */
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if (spacefree(chan->rt_read, chan->rt_write, chan->buffer_size))
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mask |= POLLOUT | POLLWRNORM;
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/* go to sleep */
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add_wait_queue(&channel_wqs[index].lx_queue, &wait);
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return mask;
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set_current_state(TASK_INTERRUPTIBLE);
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while (chan->lx_read == chan->lx_write) {
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schedule();
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set_current_state(TASK_INTERRUPTIBLE);
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if (sp_stopping) {
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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return 0;
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}
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[index].lx_queue, &wait);
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/* back running */
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}
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else
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return 0;
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}
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return (chan->lx_write + chan->buffer_size - chan->lx_read)
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% chan->buffer_size;
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}
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static ssize_t rtlx_read(struct file *file, char __user * buffer, size_t count,
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loff_t * ppos)
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static inline int write_spacefree(int read, int write, int size)
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{
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unsigned long failed;
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size_t fl = 0L;
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int minor;
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struct rtlx_channel *lx;
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DECLARE_WAITQUEUE(wait, current);
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minor = MINOR(file->f_dentry->d_inode->i_rdev);
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lx = &rtlx->channel[minor];
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/* data available? */
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if (lx->lx_write == lx->lx_read) {
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if (file->f_flags & O_NONBLOCK)
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return 0; /* -EAGAIN makes cat whinge */
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/* go to sleep */
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add_wait_queue(&channel_wqs[minor].lx_queue, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while (lx->lx_write == lx->lx_read)
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schedule();
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&channel_wqs[minor].lx_queue, &wait);
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/* back running */
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if (read == write) {
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/*
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* Never fill the buffer completely, so indexes are always
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* equal if empty and only empty, or !equal if data available
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*/
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return size - 1;
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}
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return ((read + size - write) % size) - 1;
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}
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unsigned int rtlx_write_poll(int index)
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{
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struct rtlx_channel *chan = &rtlx->channel[index];
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return write_spacefree(chan->rt_read, chan->rt_write, chan->buffer_size);
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}
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static inline void copy_to(void *dst, void *src, size_t count, int user)
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{
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if (user)
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copy_to_user(dst, src, count);
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else
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memcpy(dst, src, count);
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}
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static inline void copy_from(void *dst, void *src, size_t count, int user)
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{
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if (user)
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copy_from_user(dst, src, count);
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else
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memcpy(dst, src, count);
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}
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ssize_t rtlx_read(int index, void *buff, size_t count, int user)
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{
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size_t fl = 0L;
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struct rtlx_channel *lx;
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if (rtlx == NULL)
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return -ENOSYS;
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lx = &rtlx->channel[index];
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/* find out how much in total */
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count = min(count,
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(size_t)(lx->lx_write + lx->buffer_size - lx->lx_read) % lx->buffer_size);
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(size_t)(lx->lx_write + lx->buffer_size - lx->lx_read)
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% lx->buffer_size);
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/* then how much from the read pointer onwards */
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fl = min(count, (size_t)lx->buffer_size - lx->lx_read);
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fl = min( count, (size_t)lx->buffer_size - lx->lx_read);
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failed = copy_to_user (buffer, &lx->lx_buffer[lx->lx_read], fl);
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if (failed) {
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count = fl - failed;
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goto out;
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}
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copy_to(buff, &lx->lx_buffer[lx->lx_read], fl, user);
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/* and if there is anything left at the beginning of the buffer */
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if (count - fl) {
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failed = copy_to_user (buffer + fl, lx->lx_buffer, count - fl);
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if (failed) {
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count -= failed;
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goto out;
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}
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}
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if ( count - fl )
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copy_to (buff + fl, lx->lx_buffer, count - fl, user);
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out:
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/* update the index */
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lx->lx_read += count;
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lx->lx_read %= lx->buffer_size;
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@ -242,20 +365,101 @@ out:
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return count;
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}
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static ssize_t rtlx_write(struct file *file, const char __user * buffer,
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size_t count, loff_t * ppos)
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ssize_t rtlx_write(int index, void *buffer, size_t count, int user)
|
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{
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unsigned long failed;
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int minor;
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struct rtlx_channel *rt;
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size_t fl;
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||||
|
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if (rtlx == NULL)
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return(-ENOSYS);
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|
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rt = &rtlx->channel[index];
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||||
|
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/* total number of bytes to copy */
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count = min(count,
|
||||
(size_t)write_spacefree(rt->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);
|
||||
|
||||
/* 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);
|
||||
|
||||
rt->rt_write += count;
|
||||
rt->rt_write %= rt->buffer_size;
|
||||
|
||||
return(count);
|
||||
}
|
||||
|
||||
|
||||
static int file_open(struct inode *inode, struct file *filp)
|
||||
{
|
||||
int minor = MINOR(inode->i_rdev);
|
||||
|
||||
return rtlx_open(minor, (filp->f_flags & O_NONBLOCK) ? 0 : 1);
|
||||
}
|
||||
|
||||
static int file_release(struct inode *inode, struct file *filp)
|
||||
{
|
||||
int minor;
|
||||
minor = MINOR(inode->i_rdev);
|
||||
|
||||
return rtlx_release(minor);
|
||||
}
|
||||
|
||||
static unsigned int file_poll(struct file *file, poll_table * wait)
|
||||
{
|
||||
int minor;
|
||||
unsigned int mask = 0;
|
||||
|
||||
minor = MINOR(file->f_dentry->d_inode->i_rdev);
|
||||
|
||||
poll_wait(file, &channel_wqs[minor].rt_queue, wait);
|
||||
poll_wait(file, &channel_wqs[minor].lx_queue, wait);
|
||||
|
||||
if (rtlx == NULL)
|
||||
return 0;
|
||||
|
||||
/* data available to read? */
|
||||
if (rtlx_read_poll(minor, 0))
|
||||
mask |= POLLIN | POLLRDNORM;
|
||||
|
||||
/* space to write */
|
||||
if (rtlx_write_poll(minor))
|
||||
mask |= POLLOUT | POLLWRNORM;
|
||||
|
||||
return mask;
|
||||
}
|
||||
|
||||
static ssize_t file_read(struct file *file, char __user * buffer, size_t count,
|
||||
loff_t * ppos)
|
||||
{
|
||||
int minor = MINOR(file->f_dentry->d_inode->i_rdev);
|
||||
|
||||
/* data available? */
|
||||
if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) {
|
||||
return 0; // -EAGAIN makes cat whinge
|
||||
}
|
||||
|
||||
return rtlx_read(minor, buffer, count, 1);
|
||||
}
|
||||
|
||||
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 = MINOR(file->f_dentry->d_inode->i_rdev);
|
||||
rt = &rtlx->channel[minor];
|
||||
|
||||
/* any space left... */
|
||||
if (!spacefree(rt->rt_read, rt->rt_write, rt->buffer_size)) {
|
||||
if (!rtlx_write_poll(minor)) {
|
||||
|
||||
if (file->f_flags & O_NONBLOCK)
|
||||
return -EAGAIN;
|
||||
@ -263,61 +467,64 @@ static ssize_t rtlx_write(struct file *file, const char __user * buffer,
|
||||
add_wait_queue(&channel_wqs[minor].rt_queue, &wait);
|
||||
set_current_state(TASK_INTERRUPTIBLE);
|
||||
|
||||
while (!spacefree(rt->rt_read, rt->rt_write, rt->buffer_size))
|
||||
while (!rtlx_write_poll(minor))
|
||||
schedule();
|
||||
|
||||
set_current_state(TASK_RUNNING);
|
||||
remove_wait_queue(&channel_wqs[minor].rt_queue, &wait);
|
||||
}
|
||||
|
||||
/* total number of bytes to copy */
|
||||
count = min(count, (size_t)spacefree(rt->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);
|
||||
|
||||
failed = copy_from_user(&rt->rt_buffer[rt->rt_write], buffer, fl);
|
||||
if (failed) {
|
||||
count = fl - failed;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* if there's any left copy to the beginning of the buffer */
|
||||
if (count - fl) {
|
||||
failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl);
|
||||
if (failed) {
|
||||
count -= failed;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
rt->rt_write += count;
|
||||
rt->rt_write %= rt->buffer_size;
|
||||
|
||||
return count;
|
||||
return rtlx_write(minor, (void *)buffer, count, 1);
|
||||
}
|
||||
|
||||
static struct file_operations rtlx_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = rtlx_open,
|
||||
.release = rtlx_release,
|
||||
.write = rtlx_write,
|
||||
.read = rtlx_read,
|
||||
.poll = rtlx_poll
|
||||
.owner = THIS_MODULE,
|
||||
.open = file_open,
|
||||
.release = file_release,
|
||||
.write = file_write,
|
||||
.read = file_read,
|
||||
.poll = file_poll
|
||||
};
|
||||
|
||||
static struct irqaction rtlx_irq = {
|
||||
.handler = rtlx_interrupt,
|
||||
.flags = SA_INTERRUPT,
|
||||
.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 __init rtlx_module_init(void)
|
||||
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, ¬ify);
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
@ -330,5 +537,5 @@ module_init(rtlx_module_init);
|
||||
module_exit(rtlx_module_exit);
|
||||
|
||||
MODULE_DESCRIPTION("MIPS RTLX");
|
||||
MODULE_AUTHOR("Elizabeth Clarke, MIPS Technologies, Inc.");
|
||||
MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
Reference in New Issue
Block a user