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Fix incorrect logic in irqpoll patch

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This commit is contained in:
Josh Boyer 2012-06-20 15:06:01 -04:00
parent 3b37beedf4
commit b718a988d5
2 changed files with 53 additions and 53 deletions
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5
kernel.spec
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@ -62,7 +62,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
#
%global baserelease 2
%global baserelease 3
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -2282,6 +2282,9 @@ fi
# ||----w |
# || ||
%changelog
* Wed Jun 20 2012 Josh Boyer <jwboyer@redhat.com>
- Fix incorrect logic in irqpoll patch
* Mon Jun 18 2012 Josh Boyer <jwboyer@redhat.com> - 3.5.0-0.rc3.git0.2
- Disable debugging options.

101
unhandled-irqs-switch-to-polling.patch
View File

@ -1,23 +1,8 @@
Date: Mon, 30 Jan 2012 22:37:28 +0100
Message-ID: <CAPRPZsAt+e3cy1YTriikpb2SNN=jOusvnPF0ByFeun+uaBa5Og@mail.gmail.com>
From f9b32cd97783f2be14386f1347439e86109050b9 Mon Sep 17 00:00:00 2001
From: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
Date: Mon, 30 Jan 2012 22:37:28 +0100
Subject: [PATCH] Unhandled IRQs on AMD E-450: temporarily switch to
low-performance polling IRQ mode
From: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Clemens Ladisch <clemens@ladisch.de>, "Huang, Shane" <Shane.Huang@amd.com>,
Borislav Petkov <bp@amd64.org>, "Nguyen, Dong" <Dong.Nguyen@amd.com>,
jesse.brandeburg@gmail.com
Content-Type: text/plain; charset=ISO-8859-1
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
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It seems that some motherboard designs using the ASM1083 PCI/PCIe
bridge (PCI device ID 1b21:1080, Rev. 01) suffer from stuck IRQ lines
@ -79,16 +64,49 @@ I would like to thank Clemens Ladisch for his invaluable help in
finding a solution (and providing a patch to avoid my SATA going down
every time during debugging).
Signed-off-by: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
Make it less chatty. Only kick it in if we detect an ASM1083 PCI bridge.
Fix logic error due to lack of braces
Josh Boyer <jwboyer@redhat.com>
======
---
drivers/pci/quirks.c | 16 +++++++++++
kernel/irq/spurious.c | 73 +++++++++++++++++++++++++++++++++++++++---------
2 files changed, 75 insertions(+), 14 deletions(-)
--- linux-2.6.orig/kernel/irq/spurious.c
+++ linux-2.6/kernel/irq/spurious.c
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 78fda9c..6ba5dbf 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1677,6 +1677,22 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x2609, quirk_intel_pcie_pm);
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,
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 611cd60..f722eb6 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -18,6 +18,8 @@
static int irqfixup __read_mostly;
@ -113,7 +131,7 @@ Josh Boyer <jwboyer@redhat.com>
for_each_irq_desc(i, desc) {
unsigned int state;
@@ -159,14 +162,33 @@ static void poll_spurious_irqs(unsigned
@@ -159,14 +162,33 @@ static void poll_spurious_irqs(unsigned long dummy)
if (!(state & IRQS_SPURIOUS_DISABLED))
continue;
@ -152,7 +170,7 @@ Josh Boyer <jwboyer@redhat.com>
}
static inline int bad_action_ret(irqreturn_t action_ret)
@@ -177,11 +199,19 @@ static inline int bad_action_ret(irqretu
@@ -177,11 +199,19 @@ static inline int bad_action_ret(irqreturn_t action_ret)
}
/*
@ -174,7 +192,7 @@ Josh Boyer <jwboyer@redhat.com>
* functioning device sharing an IRQ with the failing one)
*/
static void
@@ -269,6 +299,8 @@ try_misrouted_irq(unsigned int irq, stru
@@ -269,6 +299,8 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
void note_interrupt(unsigned int irq, struct irq_desc *desc,
irqreturn_t action_ret)
{
@ -183,18 +201,19 @@ Josh Boyer <jwboyer@redhat.com>
if (desc->istate & IRQS_POLL_INPROGRESS)
return;
@@ -302,19 +334,31 @@ void note_interrupt(unsigned int irq, st
@@ -302,19 +334,32 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
}
desc->irq_count++;
- if (likely(desc->irq_count < 100000))
- return;
+ if (!irq_poll_and_retry)
+ if (!irq_poll_and_retry) {
+ if (likely(desc->irq_count < 100000))
+ return;
+ else
+ } else {
+ if (likely(desc->irq_count < 10))
+ return;
+ }
desc->irq_count = 0;
- if (unlikely(desc->irqs_unhandled > 99900)) {
@ -221,28 +240,6 @@ Josh Boyer <jwboyer@redhat.com>
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,
--
1.7.7.6