On 2014/9/5 22:29, David Vrabel wrote:
> On 05/09/14 11:09, Yijing Wang wrote:
>> Use MSI chip framework instead of arch MSI functions to configure
>> MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.
> [...]
>> --- a/arch/x86/pci/xen.c
>> +++ b/arch/x86/pci/xen.c
> [...]
>> @@ -418,9 +430,9 @@ int __init pci_xen_init(void)
>> #endif
>>
>> #ifdef CONFIG_PCI_MSI
>> - x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
>> - x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
>> - x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
>> + xen_msi_chip.setup_irqs = xen_setup_msi_irqs;
>> + xen_msi_chip.teardown_irqs = xen_teardown_msi_irqs;
>> + x86_msi_chip = &xen_msi_chip;
>> msi_chip.irq_mask = xen_nop_msi_mask;
>> msi_chip.irq_unmask = xen_nop_msi_mask;
>
> Why have these not been changed to set the x86_msi_chip.mask/unmask
> fields instead?
Hi David, x86_msi_chip here is struct msi_chip data type, used to configure MSI/MSI-X
irq. msi_chip above is struct irq_chip data type, represent the MSI irq controller. They are
not the same object. Their name easily confusing people.
Defined in arch/x86/kernel/apic/io_apic.c
/*
* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MSI or MSI-X Capability Structure.
*/
static struct irq_chip msi_chip = {
.name = "PCI-MSI",
.irq_unmask = unmask_msi_irq,
.irq_mask = mask_msi_irq,
.irq_ack = ack_apic_edge,
.irq_set_affinity = msi_set_affinity,
.irq_retrigger = ioapic_retrigger_irq,
};
Defined in arch/x86/kernel/apic/io_apic.c, introduced in patch 7/21
struct msi_chip apic_msi_chip = {
.setup_irqs = native_setup_msi_irqs,
.teardown_irq = native_teardown_msi_irq,
};
[...]
struct msi_chip *x86_msi_chip = &apic_msi_chip;
Thanks!
Yijing.
>
> David
>
> .
>
--
Thanks!
Yijing
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