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Fixup irqpoll patch to only activate on machines with ASM108x PCI bridge

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This commit is contained in:
Josh Boyer 2012-03-14 20:29:41 -04:00
parent fa580e5210
commit c4069fe6d2
2 changed files with 63 additions and 85 deletions
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3
kernel.spec
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@ -2344,6 +2344,9 @@ fi
# ||----w |
# || ||
%changelog
* Wed Mar 14 2012 Josh Boyer <jwboyer@redhat.com>
- Fixup irqpoll patch to only activate on machines with ASM108x PCI bridge
* Tue Mar 13 2012 John W. Linville <linville@redhat.com>
- Remove infrastructure related to compat-wireless integration

145
unhandled-irqs-switch-to-polling.patch
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@ -1,62 +1,3 @@
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Date: Mon, 30 Jan 2012 22:37:28 +0100
Message-ID: <CAPRPZsAt+e3cy1YTriikpb2SNN=jOusvnPF0ByFeun+uaBa5Og@mail.gmail.com>
Subject: [PATCH] Unhandled IRQs on AMD E-450: temporarily switch to
@ -141,21 +82,23 @@ every time during debugging).
Signed-off-by: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
Make it less chatty. Josh Boyer <jwboyer@redhat.com>
Make it less chatty. Only kick it in if we detect an ASM1083 PCI bridge.
Josh Boyer <jwboyer@redhat.com>
======
--- linux-2.6.orig/kernel/irq/spurious.c
+++ linux-2.6/kernel/irq/spurious.c
@@ -18,7 +18,7 @@
@@ -18,6 +18,8 @@
static int irqfixup __read_mostly;
-#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
+#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/100)
+int irq_poll_and_retry = 0;
+
#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
static void poll_spurious_irqs(unsigned long dummy);
static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0);
static int irq_poll_cpu;
@@ -141,14 +141,15 @@ out:
@@ -141,12 +143,13 @@ out:
static void poll_spurious_irqs(unsigned long dummy)
{
struct irq_desc *desc;
@ -168,12 +111,9 @@ Make it less chatty. Josh Boyer <jwboyer@redhat.com>
+ poll_again = 0; /* Will stay false as long as no polling candidate is found */
for_each_irq_desc(i, desc) {
- unsigned int state;
+ unsigned int state, irq;
unsigned int state;
if (!i)
continue;
@@ -159,14 +160,29 @@ static void poll_spurious_irqs(unsigned
@@ -159,14 +162,33 @@ static void poll_spurious_irqs(unsigned
if (!(state & IRQS_SPURIOUS_DISABLED))
continue;
@ -183,19 +123,23 @@ Make it less chatty. Josh Boyer <jwboyer@redhat.com>
+ /* We end up here with a disabled spurious interrupt.
+ desc->irqs_unhandled now tracks the number of times
+ the interrupt has been polled */
+
+ irq = desc->irq_data.irq;
+ if (desc->irqs_unhandled < 100) { /* 1 second delay with poll frequency 100 Hz */
+ if (irq_poll_and_retry) {
+ if (desc->irqs_unhandled < 100) { /* 1 second delay with poll frequency 100 Hz */
+ local_irq_disable();
+ try_one_irq(i, desc, true);
+ local_irq_enable();
+ desc->irqs_unhandled++;
+ poll_again = 1;
+ } else {
+ irq_enable(desc); /* Reenable the interrupt line */
+ desc->depth--;
+ desc->istate &= (~IRQS_SPURIOUS_DISABLED);
+ desc->irqs_unhandled = 0;
+ }
+ } else {
+ local_irq_disable();
+ try_one_irq(i, desc, true);
+ local_irq_enable();
+ desc->irqs_unhandled++;
+ poll_again = 1;
+ } else {
+ irq_enable(desc); /* Reenable the interrupt line */
+ desc->depth--;
+ desc->istate &= (~IRQS_SPURIOUS_DISABLED);
+ desc->irqs_unhandled = 0;
+ }
}
+ if (poll_again)
@ -208,7 +152,7 @@ Make it less chatty. Josh Boyer <jwboyer@redhat.com>
}
static inline int bad_action_ret(irqreturn_t action_ret)
@@ -177,11 +193,19 @@ static inline int bad_action_ret(irqretu
@@ -177,11 +199,19 @@ static inline int bad_action_ret(irqretu
}
/*
@ -230,7 +174,7 @@ Make it less chatty. Josh Boyer <jwboyer@redhat.com>
* functioning device sharing an IRQ with the failing one)
*/
static void
@@ -302,19 +326,19 @@ void note_interrupt(unsigned int irq, st
@@ -302,19 +332,24 @@ void note_interrupt(unsigned int irq, st
}
desc->irq_count++;
@ -242,15 +186,46 @@ Make it less chatty. Josh Boyer <jwboyer@redhat.com>
- if (unlikely(desc->irqs_unhandled > 99900)) {
+ if (unlikely(desc->irqs_unhandled >= 9)) {
/*
* The interrupt is stuck
- * The interrupt is stuck
+ * The interrupt might be stuck
*/
- __report_bad_irq(irq, desc, action_ret);
+ /* __report_bad_irq(irq, desc, action_ret); */
+ if (!irq_poll_and_retry) {
+ __report_bad_irq(irq, desc, action_ret);
+ printk(KERN_EMERG "Disabling IRQ %d\n", irq);
+ } else {
+ printk(KERN_INFO "IRQ %d might be stuck. Polling\n",
+ irq);
+ }
/*
* Now kill the IRQ
*/
- printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
+ printk(KERN_EMERG "Disabling IRQ %d\n", irq);
desc->istate |= IRQS_SPURIOUS_DISABLED;
desc->depth++;
irq_disable(desc);
--- linux-2.6.orig/drivers/pci/quirks.c
+++ linux-2.6/drivers/pci/quirks.c
@@ -1677,6 +1677,22 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_IN
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x260a, quirk_intel_pcie_pm);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x260b, quirk_intel_pcie_pm);
+/* ASM108x transparent PCI bridges apparently have broken IRQ deassert
+ * handling. This causes interrupts to get "stuck" and eventually disabled.
+ * However, the interrupts are often shared and disabling them is fairly bad.
+ * It's been somewhat successful to switch to polling mode and retry after
+ * a bit, so let's do that.
+ */
+extern int irq_poll_and_retry;
+static void quirk_asm108x_poll_interrupts(struct pci_dev *dev)
+{
+ dev_info(&dev->dev, "Buggy bridge found [%04x:%04x]\n",
+ dev->vendor, dev->device);
+ dev_info(&dev->dev, "Stuck interrupts will be polled and retried\n");
+ irq_poll_and_retry = 1;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ASMEDIA, 0x1080, quirk_asm108x_poll_interrupts);
+
#ifdef CONFIG_X86_IO_APIC
/*
* Boot interrupts on some chipsets cannot be turned off. For these chipsets,