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charset="utf-8" The new common domain number allocator can replace the custom allocator in VMD. Beyond some code reuse benefits it does close a potential race whereby vmd_find_free_domain() collides with new PCI buses coming online with a conflicting domain number. Such a race has not been observed in practice, hence not tagging this change as a fix. As VMD uses pci_create_root_bus() rather than pci_alloc_host_bridge() + pci_scan_root_bus_bridge() it has no chance to set ->domain_nr in the bridge so needs to manage freeing the domain number on its own. Cc: Nirmal Patel Signed-off-by: Dan Williams --- drivers/pci/controller/vmd.c | 33 ++++++++++----------------------- 1 file changed, 10 insertions(+), 23 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 8df064b62a2f..f60244ff9ef8 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -565,22 +565,6 @@ static void vmd_detach_resources(struct vmd_dev *vmd) vmd->dev->resource[VMD_MEMBAR2].child =3D NULL; } =20 -/* - * VMD domains start at 0x10000 to not clash with ACPI _SEG domains. - * Per ACPI r6.0, sec 6.5.6, _SEG returns an integer, of which the lower - * 16 bits are the PCI Segment Group (domain) number. Other bits are - * currently reserved. - */ -static int vmd_find_free_domain(void) -{ - int domain =3D 0xffff; - struct pci_bus *bus =3D NULL; - - while ((bus =3D pci_find_next_bus(bus)) !=3D NULL) - domain =3D max_t(int, domain, pci_domain_nr(bus)); - return domain + 1; -} - static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint, resource_size_t *offset1, resource_size_t *offset2) @@ -865,13 +849,6 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsi= gned long features) .parent =3D res, }; =20 - sd->vmd_dev =3D vmd->dev; - sd->domain =3D vmd_find_free_domain(); - if (sd->domain < 0) - return sd->domain; - - sd->node =3D pcibus_to_node(vmd->dev->bus); - /* * Currently MSI remapping must be enabled in guest passthrough mode * due to some missing interrupt remapping plumbing. This is probably @@ -903,9 +880,17 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsi= gned long features) pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]); pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]); =20 + sd->vmd_dev =3D vmd->dev; + sd->domain =3D pci_bus_find_emul_domain_nr(PCI_DOMAIN_NR_NOT_SET); + if (sd->domain < 0) + return sd->domain; + + sd->node =3D pcibus_to_node(vmd->dev->bus); + vmd->bus =3D pci_create_root_bus(&vmd->dev->dev, vmd->busn_start, &vmd_ops, sd, &resources); if (!vmd->bus) { + pci_bus_release_emul_domain_nr(sd->domain); pci_free_resource_list(&resources); vmd_remove_irq_domain(vmd); return -ENODEV; @@ -998,6 +983,7 @@ static int vmd_probe(struct pci_dev *dev, const struct = pci_device_id *id) return -ENOMEM; =20 vmd->dev =3D dev; + vmd->sysdata.domain =3D PCI_DOMAIN_NR_NOT_SET; vmd->instance =3D ida_alloc(&vmd_instance_ida, GFP_KERNEL); if (vmd->instance < 0) return vmd->instance; @@ -1063,6 +1049,7 @@ static void vmd_remove(struct pci_dev *dev) vmd_detach_resources(vmd); vmd_remove_irq_domain(vmd); ida_free(&vmd_instance_ida, vmd->instance); + pci_bus_release_emul_domain_nr(vmd->sysdata.domain); } =20 static void vmd_shutdown(struct pci_dev *dev) --=20 2.50.1