On 2013-02-26 16:57, Anders Blomdell wrote:
> On 2013-02-25 23:02, Jan Kiszka wrote:
>> On 2013-02-25 21:09, Anders Blomdell wrote:
>>> On 2013-02-25 20:10, Jan Kiszka wrote:
>>>> On 2013-02-25 20:07, Anders Blomdell wrote:
>>>>> On 2013-02-25 18:08, Jan Kiszka wrote:
>>>>>> As 3.5 is dead, this fix will never make it there unless we
>>>>>> back-port.
>>>>>> While I'm doing this, could you try if
>>>>>>
>>>>>> git://git.xenomai.org/ipipe-jki.git for-upstream/master
>>>>> I'm probably more stupid than normal (i.e I can't find any ipipe for
>>>>> x86_64):
>>>>>
>>>>> # git clone git://git.xenomai.org/ipipe-jki.git for-upstream/master
>>>>
>>>> git clone git://git.xenomai.org/ipipe-jki.git
>>>> git checkout -b for-upstream/master origin/for-upstream/master
>>> OK, thanks. Do I need to setup xenomai in order to gain any useful
>>> information, or is:
>>>
>>> CONFIG_IPIPE=y
>>> CONFIG_IPIPE_LEGACY=y
>>> CONFIG_IPIPE_CORE=y
>>> CONFIG_IPIPE_CORE_APIREV=2
>>> CONFIG_IPIPE_TARGET_APIREV=1
>>> CONFIG_IPIPE_HAVE_HOSTRT=y
>>> CONFIG_IPIPE_DELAYED_ATOMICSW=y
>>> # CONFIG_IPIPE_DEBUG is not set
>>>
>>> sufficient?
>>
>> Plain I-pipe will suffice as the the interrupt virtualization is
>> unconditional, thus __ipipe_handle_irq is always taken.
>>
>> Alternatively, here is the backported patch over 3.5.7:
>>
>> diff --git a/arch/x86/kernel/apic/io_apic.c
>> b/arch/x86/kernel/apic/io_apic.c
>> index 08e5ad4..aade7f0 100644
>> --- a/arch/x86/kernel/apic/io_apic.c
>> +++ b/arch/x86/kernel/apic/io_apic.c
>> @@ -234,11 +234,11 @@ int __init arch_early_irq_init(void)
>> zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node);
>> /*
>> * For legacy IRQ's, start with assigning irq0 to irq15 to
>> - * IRQ0_VECTOR to IRQ15_VECTOR on cpu 0.
>> + * IRQ0_VECTOR to IRQ15_VECTOR for all cpu's.
>> */
>> if (i < legacy_pic->nr_legacy_irqs) {
>> cfg[i].vector = IRQ0_VECTOR + i;
>> - cpumask_set_cpu(0, cfg[i].domain);
>> + cpumask_setall(cfg[i].domain);
>> }
>> }
>>
>> @@ -1181,8 +1181,9 @@ next:
>> current_vector = vector;
>> current_offset = offset;
>> if (old_vector) {
>> - cfg->move_in_progress = 1;
>> cpumask_copy(cfg->old_domain, cfg->domain);
>> + cfg->move_in_progress =
>> + cpumask_intersects(cfg->old_domain, cpu_online_mask);
>> }
>> for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
>> per_cpu(vector_irq, new_cpu)[vector] = irq;
>> @@ -1250,12 +1251,6 @@ void __setup_vector_irq(int cpu)
>> cfg = irq_get_chip_data(irq);
>> if (!cfg)
>> continue;
>> - /*
>> - * If it is a legacy IRQ handled by the legacy PIC, this cpu
>> - * will be part of the irq_cfg's domain.
>> - */
>> - if (irq < legacy_pic->nr_legacy_irqs && !IO_APIC_IRQ(irq))
>> - cpumask_set_cpu(cpu, cfg->domain);
>>
>> if (!cpumask_test_cpu(cpu, cfg->domain))
>> continue;
>> @@ -1380,13 +1375,6 @@ static void setup_ioapic_irq(unsigned int irq,
>> struct irq_cfg *cfg,
>>
>> if (!IO_APIC_IRQ(irq))
>> return;
>> - /*
>> - * For legacy irqs, cfg->domain starts with cpu 0 for legacy
>> - * controllers like 8259. Now that IO-APIC can handle this irq,
>> update
>> - * the cfg->domain.
>> - */
>> - if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0,
>> cfg->domain))
>> - apic->vector_allocation_domain(0, cfg->domain);
>>
>> if (assign_irq_vector(irq, cfg, apic->target_cpus()))
>> return;
>
> Thanks, have put both versions under test on different machines. Will
> come back if it crashes.
Then I hope you'll stay away...
Thanks!
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux
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