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x86/xen: Consolidate XEN-MSI init 

X86 cannot store the irq domain pointer in struct device without breaking
XEN because the irq domain pointer takes precedence over arch_*_msi_irqs()
fallbacks.

To achieve this XEN MSI interrupt management needs to be wrapped into an
irq domain.

Move the x86_msi ops setup into a single function to prepare for this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20200826112333.420224092@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-08-26 13:16:56 +02:00
parent 7d4d892de6
commit 70b59379ef
1 changed files with 32 additions and 19 deletions
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51
arch/x86/pci/xen.c
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@ -372,7 +372,10 @@ static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
}
}
#endif
#else /* CONFIG_XEN_DOM0 */
#define xen_initdom_setup_msi_irqs NULL
#define xen_initdom_restore_msi_irqs NULL
#endif /* !CONFIG_XEN_DOM0 */
static void xen_teardown_msi_irqs(struct pci_dev *dev)
{
@ -404,7 +407,31 @@ static void xen_teardown_msi_irq(unsigned int irq)
WARN_ON_ONCE(1);
}
#endif
static __init void xen_setup_pci_msi(void)
{
if (xen_pv_domain()) {
if (xen_initial_domain()) {
x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
} else {
x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
}
x86_msi.teardown_msi_irqs = xen_pv_teardown_msi_irqs;
pci_msi_ignore_mask = 1;
} else if (xen_hvm_domain()) {
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
} else {
WARN_ON_ONCE(1);
return;
}
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
}
#else /* CONFIG_PCI_MSI */
static inline void xen_setup_pci_msi(void) { }
#endif /* CONFIG_PCI_MSI */
int __init pci_xen_init(void)
{
@ -421,12 +448,7 @@ int __init pci_xen_init(void)
/* Keep ACPI out of the picture */
acpi_noirq_set();
#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_pv_teardown_msi_irqs;
pci_msi_ignore_mask = 1;
#endif
xen_setup_pci_msi();
return 0;
}
@ -446,10 +468,7 @@ static void __init xen_hvm_msi_init(void)
((eax & XEN_HVM_CPUID_APIC_ACCESS_VIRT) && boot_cpu_has(X86_FEATURE_APIC)))
return;
}
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
xen_setup_pci_msi();
}
#endif
@ -482,13 +501,7 @@ int __init pci_xen_initial_domain(void)
{
int irq;
#ifdef CONFIG_PCI_MSI
x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
x86_msi.teardown_msi_irqs = xen_teardown_pv_msi_irqs;
x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
pci_msi_ignore_mask = 1;
#endif
xen_setup_pci_msi();
__acpi_register_gsi = acpi_register_gsi_xen;
__acpi_unregister_gsi = NULL;
/*