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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/include/asm/irqdomain.h
View File

@ -53,9 +53,11 @@ extern int mp_irqdomain_ioapic_idx(struct irq_domain *domain);
#ifdef CONFIG_PCI_MSI
void x86_create_pci_msi_domain(void);
struct irq_domain *native_create_pci_msi_domain(void);
extern struct irq_domain *x86_pci_msi_default_domain;
#else
static inline void x86_create_pci_msi_domain(void) { }
#define native_create_pci_msi_domain NULL
#define x86_pci_msi_default_domain NULL
#endif
#endif

2
arch/x86/kernel/apic/msi.c
View File

@ -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)
{

18
arch/x86/pci/common.c
View File

@ -19,6 +19,7 @@
#include <asm/smp.h>
#include <asm/pci_x86.h>
#include <asm/setup.h>
#include <asm/irqdomain.h>
unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
PCI_PROBE_MMCONF;
@ -633,8 +634,9 @@ static void set_dev_domain_options(struct pci_dev *pdev)
int pcibios_add_device(struct pci_dev *dev)
{
struct setup_data *data;
struct pci_setup_rom *rom;
struct irq_domain *msidom;
struct setup_data *data;
u64 pa_data;
pa_data = boot_params.hdr.setup_data;
@ -661,6 +663,20 @@ int pcibios_add_device(struct pci_dev *dev)
memunmap(data);
}
set_dev_domain_options(dev);
/*
* Setup the initial MSI domain of the device. If the underlying
* bus has a PCI/MSI irqdomain associated use the bus domain,
* otherwise set the default domain. This ensures that special irq
* domains e.g. VMD are preserved. The default ensures initial
* operation if irq remapping is not active. If irq remapping is
* active it will overwrite the domain pointer when the device is
* associated to a remapping domain.
*/
msidom = dev_get_msi_domain(&dev->bus->dev);
if (!msidom)
msidom = x86_pci_msi_default_domain;
dev_set_msi_domain(&dev->dev, msidom);
return 0;
}