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x86/pci: Set default irq domain in pcibios_add_device()

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Now that interrupt remapping sets the irqdomain pointer when a PCI device
is added it's possible to store the default irq domain in the device struct
in pcibios_add_device().

If the bus to which a device is connected has an irq domain associated then
this domain is used otherwise the default domain (PCI/MSI native or XEN
PCI/MSI) is used. Using the bus domain ensures that special MSI bus domains
like VMD work.

This makes XEN and the non-remapped native case work solely based on the
irq domain pointer in struct device for PCI/MSI and allows to remove the
arch fallback and make most of the x86_msi ops private to XEN in the next
steps.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200826112333.900423047@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-08-26 13:17:01 +02:00
parent 2b2c6aa638
commit 2c681e6b37
3 changed files with 20 additions and 2 deletions
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2
arch/x86/kernel/apic/msi.c
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@@ -21,7 +21,7 @@
#include <asm/apic.h>
#include <asm/irq_remapping.h>
static struct irq_domain *x86_pci_msi_default_domain __ro_after_init;
struct irq_domain *x86_pci_msi_default_domain __ro_after_init;
static void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg)
{