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Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 irq fixes from Ingo Molnar:
 "Two changes: a cpu-hotplug/irq race fix, plus a HyperV related fix"

* 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/irq: Fix fixup_irqs() error handling
  x86, irq, pic: Probe for legacy PIC and set legacy_pic appropriately
This commit is contained in:
Linus Torvalds 2014-06-12 20:03:47 -07:00
commit 71998d1be4
4 changed files with 46 additions and 24 deletions
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28
arch/x86/kernel/apic/io_apic.c
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@ -2297,7 +2297,7 @@ 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;
@ -2328,7 +2328,7 @@ 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);
@ -3001,9 +3001,11 @@ 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);
@ -3100,9 +3102,11 @@ 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);
@ -3149,9 +3153,11 @@ 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);
@ -3218,9 +3224,11 @@ 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;

9
arch/x86/kernel/cpu/mshyperv.c
View File

@ -132,15 +132,6 @@ static void __init ms_hyperv_init_platform(void)
lapic_timer_frequency = hv_lapic_frequency;
printk(KERN_INFO "HyperV: LAPIC Timer Frequency: %#x\n",
lapic_timer_frequency);
/*
* On Hyper-V, when we are booting off an EFI firmware stack,
* we do not have many legacy devices including PIC, PIT etc.
*/
if (efi_enabled(EFI_BOOT)) {
printk(KERN_INFO "HyperV: Using null_legacy_pic\n");
legacy_pic = &null_legacy_pic;
}
}
#endif

20
arch/x86/kernel/i8259.c
View File

@ -299,13 +299,31 @@ static void unmask_8259A(void)
static void init_8259A(int auto_eoi)
{
unsigned long flags;
unsigned char probe_val = ~(1 << PIC_CASCADE_IR);
unsigned char new_val;
i8259A_auto_eoi = auto_eoi;
raw_spin_lock_irqsave(&i8259A_lock, flags);
outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */
/*
* Check to see if we have a PIC.
* Mask all except the cascade and read
* back the value we just wrote. If we don't
* have a PIC, we will read 0xff as opposed to the
* value we wrote.
*/
outb(0xff, PIC_SLAVE_IMR); /* mask all of 8259A-2 */
outb(probe_val, PIC_MASTER_IMR);
new_val = inb(PIC_MASTER_IMR);
if (new_val != probe_val) {
printk(KERN_INFO "Using NULL legacy PIC\n");
legacy_pic = &null_legacy_pic;
raw_spin_unlock_irqrestore(&i8259A_lock, flags);
return;
}
outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */
/*
* outb_pic - this has to work on a wide range of PC hardware.

13
arch/x86/kernel/irq.c
View File

@ -365,6 +365,7 @@ 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;
@ -403,10 +404,14 @@ 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);
else if (!(warned++))
set_affinity = 0;
if (chip->irq_set_affinity) {
ret = chip->irq_set_affinity(data, affinity, true);
if (ret == -ENOSPC)
pr_crit("IRQ %d set affinity failed because there are no available vectors. The device assigned to this IRQ is unstable.\n", irq);
} else {
if (!(warned++))
set_affinity = 0;
}
/*
* We unmask if the irq was not marked masked by the