/*
- * Intel Multimedia Timer device implementation for SGI SN platforms.
+ * Timer device implementation for SGI SN platforms.
*
* 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) 2001-2004 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (c) 2001-2006 Silicon Graphics, Inc. All rights reserved.
*
* This driver exports an API that should be supportable by any HPET or IA-PC
* multimedia timer. The code below is currently specific to the SGI Altix
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/mm.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/mmtimer.h>
#include <linux/miscdevice.h>
#include <linux/posix-timers.h>
/* name of the device, usually in /dev */
#define MMTIMER_NAME "mmtimer"
#define MMTIMER_DESC "SGI Altix RTC Timer"
-#define MMTIMER_VERSION "2.0"
+#define MMTIMER_VERSION "2.1"
#define RTC_BITS 55 /* 55 bits for this implementation */
*/
static unsigned long mmtimer_femtoperiod = 0;
-static struct file_operations mmtimer_fops = {
+static const struct file_operations mmtimer_fops = {
.owner = THIS_MODULE,
.mmap = mmtimer_mmap,
.ioctl = mmtimer_ioctl,
};
-/*
- * Comparators and their associated info. Shub has
- * three comparison registers.
- */
-
/*
* We only have comparison registers RTC1-4 currently available per
* node. RTC0 is used by SAL.
* This function must be called with interrupts disabled and preemption off
* in order to insure that the setup succeeds in a deterministic time frame.
* It will check if the interrupt setup succeeded.
- * mmtimer_setup will return the cycles that we were too late if the
- * initialization failed.
*/
static int inline mmtimer_setup(int comparator, unsigned long expires)
{
- long diff;
-
switch (comparator) {
case 0:
mmtimer_setup_int_0(expires);
break;
}
/* We might've missed our expiration time */
- diff = rtc_time() - expires;
- if (diff > 0) {
- if (mmtimer_int_pending(comparator)) {
- /* We'll get an interrupt for this once we're done */
- return 0;
- }
- /* Looks like we missed it */
- return diff;
- }
+ if (rtc_time() < expires)
+ return 1;
- return 0;
+ /*
+ * If an interrupt is already pending then its okay
+ * if not then we failed
+ */
+ return mmtimer_int_pending(comparator);
}
static int inline mmtimer_disable_int(long nasid, int comparator)
struct tasklet_struct tasklet;
} mmtimer_t;
-/*
- * Total number of comparators is comparators/node * MAX nodes/running kernel
- */
-static mmtimer_t timers[NUM_COMPARATORS*MAX_COMPACT_NODES];
+static mmtimer_t ** timers;
/**
* mmtimer_ioctl - ioctl interface for /dev/mmtimer
if (PAGE_SIZE > (1 << 16))
return -ENOSYS;
- vma->vm_flags |= (VM_IO | VM_SHM | VM_LOCKED );
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
mmtimer_addr = __pa(RTC_COUNTER_ADDR);
static struct timespec sgi_clock_offset;
static int sgi_clock_period;
-static int sgi_clock_get(struct timespec *tp)
+static int sgi_clock_get(clockid_t clockid, struct timespec *tp)
{
u64 nsec;
return 0;
};
-static int sgi_clock_set(struct timespec *tp)
+static int sgi_clock_set(clockid_t clockid, struct timespec *tp)
{
u64 nsec;
int n;
struct k_itimer *t = x->timer;
- t->it_timer.magic = x->i;
+ t->it.mmtimer.clock = x->i;
t->it_overrun--;
n = 0;
do {
- t->it_timer.expires += t->it_incr << n;
+ t->it.mmtimer.expires += t->it.mmtimer.incr << n;
t->it_overrun += 1 << n;
n++;
if (n > 20)
return 1;
- } while (mmtimer_setup(x->i, t->it_timer.expires));
+ } while (!mmtimer_setup(x->i, t->it.mmtimer.expires));
return 0;
}
* mmtimer_interrupt - timer interrupt handler
* @irq: irq received
* @dev_id: device the irq came from
- * @regs: register state upon receipt of the interrupt
*
* Called when one of the comarators matches the counter, This
* routine will send signals to processes that have requested
* registers.
*/
static irqreturn_t
-mmtimer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+mmtimer_interrupt(int irq, void *dev_id)
{
int i;
- mmtimer_t *base = timers + cpuid_to_cnodeid(smp_processor_id()) *
- NUM_COMPARATORS;
unsigned long expires = 0;
int result = IRQ_NONE;
+ unsigned indx = cpu_to_node(smp_processor_id());
/*
* Do this once for each comparison register
*/
for (i = 0; i < NUM_COMPARATORS; i++) {
+ mmtimer_t *base = timers[indx] + i;
/* Make sure this doesn't get reused before tasklet_sched */
- spin_lock(&base[i].lock);
- if (base[i].cpu == smp_processor_id()) {
- if (base[i].timer)
- expires = base[i].timer->it_timer.expires;
+ spin_lock(&base->lock);
+ if (base->cpu == smp_processor_id()) {
+ if (base->timer)
+ expires = base->timer->it.mmtimer.expires;
/* expires test won't work with shared irqs */
if ((mmtimer_int_pending(i) > 0) ||
(expires && (expires < rtc_time()))) {
mmtimer_clr_int_pending(i);
- tasklet_schedule(&base[i].tasklet);
+ tasklet_schedule(&base->tasklet);
result = IRQ_HANDLED;
}
}
- spin_unlock(&base[i].lock);
+ spin_unlock(&base->lock);
expires = 0;
}
return result;
goto out;
t->it_overrun = 0;
- if (tasklist_lock.write_lock || posix_timer_event(t, 0) != 0) {
+ if (posix_timer_event(t, 0) != 0) {
// printk(KERN_WARNING "mmtimer: cannot deliver signal.\n");
t->it_overrun++;
}
- if(t->it_incr) {
+ if(t->it.mmtimer.incr) {
/* Periodic timer */
if (reschedule_periodic_timer(x)) {
printk(KERN_WARNING "mmtimer: unable to reschedule\n");
}
} else {
/* Ensure we don't false trigger in mmtimer_interrupt */
- t->it_timer.expires = 0;
+ t->it.mmtimer.expires = 0;
}
t->it_overrun_last = t->it_overrun;
out:
static int sgi_timer_create(struct k_itimer *timer)
{
/* Insure that a newly created timer is off */
- timer->it_timer.magic = TIMER_OFF;
+ timer->it.mmtimer.clock = TIMER_OFF;
return 0;
}
*/
static int sgi_timer_del(struct k_itimer *timr)
{
- int i = timr->it_timer.magic;
- cnodeid_t nodeid = timr->it_timer.data;
- mmtimer_t *t = timers + nodeid * NUM_COMPARATORS +i;
+ int i = timr->it.mmtimer.clock;
+ cnodeid_t nodeid = timr->it.mmtimer.node;
+ mmtimer_t *t = timers[nodeid] + i;
unsigned long irqflags;
if (i != TIMER_OFF) {
spin_lock_irqsave(&t->lock, irqflags);
mmtimer_disable_int(cnodeid_to_nasid(nodeid),i);
t->timer = NULL;
- timr->it_timer.magic = TIMER_OFF;
- timr->it_timer.expires = 0;
+ timr->it.mmtimer.clock = TIMER_OFF;
+ timr->it.mmtimer.expires = 0;
spin_unlock_irqrestore(&t->lock, irqflags);
}
return 0;
static void sgi_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
{
- if (timr->it_timer.magic == TIMER_OFF) {
+ if (timr->it.mmtimer.clock == TIMER_OFF) {
cur_setting->it_interval.tv_nsec = 0;
cur_setting->it_interval.tv_sec = 0;
cur_setting->it_value.tv_nsec = 0;
return;
}
- ns_to_timespec(cur_setting->it_interval, timr->it_incr * sgi_clock_period);
- ns_to_timespec(cur_setting->it_value, (timr->it_timer.expires - rtc_time())* sgi_clock_period);
+ ns_to_timespec(cur_setting->it_interval, timr->it.mmtimer.incr * sgi_clock_period);
+ ns_to_timespec(cur_setting->it_value, (timr->it.mmtimer.expires - rtc_time())* sgi_clock_period);
return;
}
if (flags & TIMER_ABSTIME) {
struct timespec n;
+ unsigned long now;
getnstimeofday(&n);
- when -= timespec_to_ns(n);
+ now = timespec_to_ns(n);
+ if (when > now)
+ when -= now;
+ else
+ /* Fire the timer immediately */
+ when = 0;
}
/*
*/
preempt_disable();
- nodeid = cpuid_to_cnodeid(smp_processor_id());
- base = timers + nodeid * NUM_COMPARATORS;
+ nodeid = cpu_to_node(smp_processor_id());
retry:
/* Don't use an allocated timer, or a deleted one that's pending */
for(i = 0; i< NUM_COMPARATORS; i++) {
- if (!base[i].timer && !base[i].tasklet.state) {
+ base = timers[nodeid] + i;
+ if (!base->timer && !base->tasklet.state) {
break;
}
}
return -EBUSY;
}
- spin_lock_irqsave(&base[i].lock, irqflags);
+ spin_lock_irqsave(&base->lock, irqflags);
- if (base[i].timer || base[i].tasklet.state != 0) {
- spin_unlock_irqrestore(&base[i].lock, irqflags);
+ if (base->timer || base->tasklet.state != 0) {
+ spin_unlock_irqrestore(&base->lock, irqflags);
goto retry;
}
- base[i].timer = timr;
- base[i].cpu = smp_processor_id();
+ base->timer = timr;
+ base->cpu = smp_processor_id();
- timr->it_timer.magic = i;
- timr->it_timer.data = nodeid;
- timr->it_incr = period;
- timr->it_timer.expires = when;
+ timr->it.mmtimer.clock = i;
+ timr->it.mmtimer.node = nodeid;
+ timr->it.mmtimer.incr = period;
+ timr->it.mmtimer.expires = when;
if (period == 0) {
- if (mmtimer_setup(i, when)) {
+ if (!mmtimer_setup(i, when)) {
mmtimer_disable_int(-1, i);
posix_timer_event(timr, 0);
- timr->it_timer.expires = 0;
+ timr->it.mmtimer.expires = 0;
}
} else {
- timr->it_timer.expires -= period;
- if (reschedule_periodic_timer(base+i))
+ timr->it.mmtimer.expires -= period;
+ if (reschedule_periodic_timer(base))
err = -EINVAL;
}
- spin_unlock_irqrestore(&base[i].lock, irqflags);
+ spin_unlock_irqrestore(&base->lock, irqflags);
preempt_enable();
static int __init mmtimer_init(void)
{
unsigned i;
+ cnodeid_t node, maxn = -1;
if (!ia64_platform_is("sn2"))
- return -1;
+ return 0;
/*
* Sanity check the cycles/sec variable
if (sn_rtc_cycles_per_second < 100000) {
printk(KERN_ERR "%s: unable to determine clock frequency\n",
MMTIMER_NAME);
- return -1;
+ goto out1;
}
mmtimer_femtoperiod = ((unsigned long)1E15 + sn_rtc_cycles_per_second /
2) / sn_rtc_cycles_per_second;
- for (i=0; i< NUM_COMPARATORS*MAX_COMPACT_NODES; i++) {
- spin_lock_init(&timers[i].lock);
- timers[i].timer = NULL;
- timers[i].cpu = 0;
- timers[i].i = i % NUM_COMPARATORS;
- tasklet_init(&timers[i].tasklet, mmtimer_tasklet, (unsigned long) (timers+i));
- }
-
- if (request_irq(SGI_MMTIMER_VECTOR, mmtimer_interrupt, SA_PERCPU_IRQ, MMTIMER_NAME, NULL)) {
+ if (request_irq(SGI_MMTIMER_VECTOR, mmtimer_interrupt, IRQF_PERCPU, MMTIMER_NAME, NULL)) {
printk(KERN_WARNING "%s: unable to allocate interrupt.",
MMTIMER_NAME);
- return -1;
+ goto out1;
}
- strcpy(mmtimer_miscdev.devfs_name, MMTIMER_NAME);
if (misc_register(&mmtimer_miscdev)) {
printk(KERN_ERR "%s: failed to register device\n",
MMTIMER_NAME);
- return -1;
+ goto out2;
+ }
+
+ /* Get max numbered node, calculate slots needed */
+ for_each_online_node(node) {
+ maxn = node;
+ }
+ maxn++;
+
+ /* Allocate list of node ptrs to mmtimer_t's */
+ timers = kmalloc(sizeof(mmtimer_t *)*maxn, GFP_KERNEL);
+ if (timers == NULL) {
+ printk(KERN_ERR "%s: failed to allocate memory for device\n",
+ MMTIMER_NAME);
+ goto out3;
+ }
+
+ memset(timers,0,(sizeof(mmtimer_t *)*maxn));
+
+ /* Allocate mmtimer_t's for each online node */
+ for_each_online_node(node) {
+ timers[node] = kmalloc_node(sizeof(mmtimer_t)*NUM_COMPARATORS, GFP_KERNEL, node);
+ if (timers[node] == NULL) {
+ printk(KERN_ERR "%s: failed to allocate memory for device\n",
+ MMTIMER_NAME);
+ goto out4;
+ }
+ for (i=0; i< NUM_COMPARATORS; i++) {
+ mmtimer_t * base = timers[node] + i;
+
+ spin_lock_init(&base->lock);
+ base->timer = NULL;
+ base->cpu = 0;
+ base->i = i;
+ tasklet_init(&base->tasklet, mmtimer_tasklet,
+ (unsigned long) (base));
+ }
}
sgi_clock_period = sgi_clock.res = NSEC_PER_SEC / sn_rtc_cycles_per_second;
sn_rtc_cycles_per_second/(unsigned long)1E6);
return 0;
+
+out4:
+ for_each_online_node(node) {
+ kfree(timers[node]);
+ }
+out3:
+ misc_deregister(&mmtimer_miscdev);
+out2:
+ free_irq(SGI_MMTIMER_VECTOR, NULL);
+out1:
+ return -1;
}
module_init(mmtimer_init);
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