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Date: Wed, 5 Mar 2014 15:04:14 -0500
From: Prarit Bhargava <prarit@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Prarit Bhargava <prarit@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Rui Wang <rui.y.wang@...el.com>,
Liu Ping Fan <kernelfans@...il.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>,
Lv Zheng <lv.zheng@...el.com>,
Seiji Aguchi <seiji.aguchi@....com>,
Yang Zhang <yang.z.zhang@...el.com>,
Andi Kleen <ak@...ux.intel.com>,
"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
Li Fei <fei.li@...el.com>, gong.chen@...ux.intel.com
Subject: [PATCH] x86, fix x86 fixup_irqs() error handling
fixup_irqs() calls chip->set_irq_affinity which eventually calls
__assign_irq_vector(). Errors are not propogated back from this function call
and this results in silent irq relocation failures. This patch fixes this
issue and prints out a warning if there is a relocation failure.
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Rui Wang <rui.y.wang@...el.com>
Cc: Liu Ping Fan <kernelfans@...il.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc: Lv Zheng <lv.zheng@...el.com>
Cc: Seiji Aguchi <seiji.aguchi@....com>
Cc: Yang Zhang <yang.z.zhang@...el.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
Cc: Li Fei <fei.li@...el.com>
Cc: gong.chen@...ux.intel.com
Signed-off-by: Prarit Bhargava <prarit@...hat.com>
---
arch/x86/kernel/apic/io_apic.c | 28 ++++++++++++++++++----------
arch/x86/kernel/irq.c | 9 +++++++--
2 files changed, 25 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 6ad4658..b4b21db 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2312,7 +2312,7 @@ int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
int err;
if (!config_enabled(CONFIG_SMP))
- return -1;
+ return -EPERM;
if (!cpumask_intersects(mask, cpu_online_mask))
return -EINVAL;
@@ -2343,7 +2343,7 @@ int native_ioapic_set_affinity(struct irq_data *data,
int ret;
if (!config_enabled(CONFIG_SMP))
- return -1;
+ return -EPERM;
raw_spin_lock_irqsave(&ioapic_lock, flags);
ret = __ioapic_set_affinity(data, mask, &dest);
@@ -3075,9 +3075,11 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
struct irq_cfg *cfg = data->chip_data;
struct msi_msg msg;
unsigned int dest;
+ int ret;
- if (__ioapic_set_affinity(data, mask, &dest))
- return -1;
+ ret = __ioapic_set_affinity(data, mask, &dest);
+ if (ret)
+ return ret;
__get_cached_msi_msg(data->msi_desc, &msg);
@@ -3177,9 +3179,11 @@ dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
struct irq_cfg *cfg = data->chip_data;
unsigned int dest, irq = data->irq;
struct msi_msg msg;
+ int ret;
- if (__ioapic_set_affinity(data, mask, &dest))
- return -1;
+ ret = __ioapic_set_affinity(data, mask, &dest);
+ if (ret)
+ return ret;
dmar_msi_read(irq, &msg);
@@ -3226,9 +3230,11 @@ static int hpet_msi_set_affinity(struct irq_data *data,
struct irq_cfg *cfg = data->chip_data;
struct msi_msg msg;
unsigned int dest;
+ int ret;
- if (__ioapic_set_affinity(data, mask, &dest))
- return -1;
+ ret = __ioapic_set_affinity(data, mask, &dest);
+ if (ret)
+ return ret;
hpet_msi_read(data->handler_data, &msg);
@@ -3295,9 +3301,11 @@ ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
{
struct irq_cfg *cfg = data->chip_data;
unsigned int dest;
+ int ret;
- if (__ioapic_set_affinity(data, mask, &dest))
- return -1;
+ ret = __ioapic_set_affinity(data, mask, &dest);
+ if (ret)
+ return ret;
target_ht_irq(data->irq, dest, cfg->vector);
return IRQ_SET_MASK_OK_NOCOPY;
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index d99f31d..55fab61 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -351,6 +351,7 @@ void fixup_irqs(void)
struct irq_desc *desc;
struct irq_data *data;
struct irq_chip *chip;
+ int ret;
for_each_irq_desc(irq, desc) {
int break_affinity = 0;
@@ -389,8 +390,12 @@ void fixup_irqs(void)
if (!irqd_can_move_in_process_context(data) && chip->irq_mask)
chip->irq_mask(data);
- if (chip->irq_set_affinity)
- chip->irq_set_affinity(data, affinity, true);
+ if (chip->irq_set_affinity) {
+ ret = chip->irq_set_affinity(data, affinity, true);
+ WARN(ret == -ENOSPC,
+ "IRQ %d set affinity failed with %d. The device assigned to this IRQ is unstable.\n",
+ irq, ret);
+ }
else if (!(warned++))
set_affinity = 0;
--
1.7.9.3
--
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