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Date: Fri, 16 May 2008 17:14:30 +0800
From: Kevin Hao <kexin.hao@...driver.com>
To: Clemens Ladisch <clemens@...isch.de>
Cc: venkatesh.pallipadi@...el.com, bob.picco@...com, mingo@...hat.com,
tglx@...utronix.de, linux-kernel@...r.kernel.org,
Kevin Hao <kexin.hao@...driver.com>
Subject: Re: [PATCH] x86: Get irq for hpet timer
On Fri, 2008-05-16 at 10:46 +0200, Clemens Ladisch wrote:
> Kevin Hao wrote:
> > HPET timer's IRQ is 0 by default, so we have to select which irq
> > will be used for these timers. We wait to set the timer's irq until
> > we really turn on interrupt in order to reduce the chance of
> > conflicting with some legacy device.
> >
> > + for (irq = find_first_bit(&cap, HPET_MAX_IRQ); irq < HPET_MAX_IRQ;
> > + irq = find_next_bit(&cap, HPET_MAX_IRQ, 1 + irq)) {
> > + if (request_irq(irq, hpet_interrupt, irq_flags,
> > + devp->hd_name, (void *)devp)) {
> > + printk(KERN_WARNING "hpet: IRQ %d is not free\n", irq);
> > + continue;
>
> This warning message will be output for every interrupt that is in use
> by another device. I think it would be better to postpone complaining
> until after the loop, if no interrupt has been found at all.
>
Ok, I agree with you.
This is the revised version.
Best Regards,
Kevin
---
drivers/char/hpet.c | 63 ++++++++++++++++++++++++++++++++++++++------------
include/linux/hpet.h | 3 +-
2 files changed, 50 insertions(+), 16 deletions(-)
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index e7fb0bc..0fdc627 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -383,6 +383,52 @@ hpet_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
return hpet_ioctl_common(devp, cmd, arg, 0);
}
+static int hpet_timer_get_irq(struct hpet_dev *devp)
+{
+ struct hpet_timer __iomem *timer;
+ struct hpet __iomem *hpet;
+ struct hpets *hpetp;
+ unsigned long cap, irq_flags;
+ int irq;
+
+ timer = devp->hd_timer;
+ hpet = devp->hd_hpet;
+ hpetp = devp->hd_hpets;
+
+ irq = devp->hd_hdwirq;
+
+ sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
+ irq_flags = devp->hd_flags & HPET_SHARED_IRQ
+ ? IRQF_SHARED : IRQF_DISABLED;
+ if (irq) {
+ if (request_irq(irq, hpet_interrupt, irq_flags,
+ devp->hd_name, (void *)devp)) {
+ printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
+ irq = 0;
+ }
+ return irq;
+ }
+
+ cap = (readq(&timer->hpet_config) & Tn_INT_ROUTE_CAP_MASK)
+ >> Tn_INT_ROUTE_CAP_SHIFT;
+
+ for (irq = find_first_bit(&cap, HPET_MAX_IRQ); irq < HPET_MAX_IRQ;
+ irq = find_next_bit(&cap, HPET_MAX_IRQ, 1 + irq)) {
+ if (request_irq(irq, hpet_interrupt, irq_flags,
+ devp->hd_name, (void *)devp))
+ continue;
+ break;
+ }
+
+ if (irq >= HPET_MAX_IRQ) {
+ printk(KERN_WARNING "hpet: No available IRQ for %s timer\n",
+ devp->hd_name);
+ irq = 0;
+ }
+
+ return irq;
+}
+
static int hpet_ioctl_ieon(struct hpet_dev *devp)
{
struct hpet_timer __iomem *timer;
@@ -412,21 +458,7 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
devp->hd_flags |= HPET_SHARED_IRQ;
spin_unlock_irq(&hpet_lock);
- irq = devp->hd_hdwirq;
-
- if (irq) {
- unsigned long irq_flags;
-
- sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
- irq_flags = devp->hd_flags & HPET_SHARED_IRQ
- ? IRQF_SHARED : IRQF_DISABLED;
- if (request_irq(irq, hpet_interrupt, irq_flags,
- devp->hd_name, (void *)devp)) {
- printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
- irq = 0;
- }
- }
-
+ irq = hpet_timer_get_irq(devp);
if (irq == 0) {
spin_lock_irq(&hpet_lock);
devp->hd_flags ^= HPET_IE;
@@ -438,6 +470,7 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
t = devp->hd_ireqfreq;
v = readq(&timer->hpet_config);
g = v | Tn_INT_ENB_CNF_MASK;
+ g |= irq << Tn_INT_ROUTE_CNF_SHIFT;
if (devp->hd_flags & HPET_PERIODIC) {
write_counter(t, &timer->hpet_compare);
diff --git a/include/linux/hpet.h b/include/linux/hpet.h
index 2dc29ce..440ca72 100644
--- a/include/linux/hpet.h
+++ b/include/linux/hpet.h
@@ -37,6 +37,7 @@ struct hpet {
#define hpet_compare _u1._hpet_compare
#define HPET_MAX_TIMERS (32)
+#define HPET_MAX_IRQ (32)
/*
* HPET general capabilities register
@@ -64,7 +65,7 @@ struct hpet {
*/
#define Tn_INT_ROUTE_CAP_MASK (0xffffffff00000000ULL)
-#define Tn_INI_ROUTE_CAP_SHIFT (32UL)
+#define Tn_INT_ROUTE_CAP_SHIFT (32UL)
#define Tn_FSB_INT_DELCAP_MASK (0x8000UL)
#define Tn_FSB_INT_DELCAP_SHIFT (15)
#define Tn_FSB_EN_CNF_MASK (0x4000UL)
>
> Regards,
> Clemens
--
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