1 // SPDX-License-Identifier: GPL-2.0-only
3  * Xen PCI - handle PCI (INTx) and MSI infrastructure calls for PV, HVM and
4  * initial domain support. We also handle the DSDT _PRT callbacks for GSI's
5  * used in HVM and initial domain mode (PV does not parse ACPI, so it has no
7  * 0xcf8 PCI configuration read/write.
15 #include <linux/pci.h>
26 #include <asm/xen/pci.h>
41 		dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",  in xen_pcifront_enable_irq()
45 	/* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/  in xen_pcifront_enable_irq()
53 		dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",  in xen_pcifront_enable_irq()
58 	dev->irq = rc;  in xen_pcifront_enable_irq()
59 	dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);  in xen_pcifront_enable_irq()
66 	int rc, pirq = -1, irq;  in xen_register_pirq()
86 		return -1;  in xen_register_pirq()
91 		name = "ioapic-edge";  in xen_register_pirq()
94 		name = "ioapic-level";  in xen_register_pirq()
101 	printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi);  in xen_register_pirq()
110 		return -1;  in acpi_register_gsi_xen_hvm()
123 		return -1;  in xen_register_gsi()
135 	if (rc == -EEXIST)  in xen_register_gsi()
177 		return -ENOMEM;  in xen_setup_msi_irqs()
190 					       "pcifront-msi-x" :  in xen_setup_msi_irqs()
191 					       "pcifront-msi",  in xen_setup_msi_irqs()
203 	if (ret == -ENOSYS)  in xen_setup_msi_irqs()
204 		dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");  in xen_setup_msi_irqs()
206 		dev_err(&dev->dev, "Xen PCI frontend error: %d!\n", ret);  in xen_setup_msi_irqs()
221 	msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH;  in xen_msi_compose_msg()
222 	msg->arch_addr_hi.destid_8_31 = pirq >> 8;  in xen_msi_compose_msg()
223 	msg->arch_addr_lo.destid_0_7 = pirq & 0xFF;  in xen_msi_compose_msg()
224 	msg->arch_addr_lo.base_address = X86_MSI_BASE_ADDRESS_LOW;  in xen_msi_compose_msg()
225 	msg->arch_data.delivery_mode = APIC_DELIVERY_MODE_EXTINT;  in xen_msi_compose_msg()
240 			irq = -ENODEV;  in xen_hvm_setup_msi_irqs()
245 		dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);  in xen_hvm_setup_msi_irqs()
249 					       "msi-x" : "msi",  in xen_hvm_setup_msi_irqs()
253 		dev_dbg(&dev->dev,  in xen_hvm_setup_msi_irqs()
254 			"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);  in xen_hvm_setup_msi_irqs()
259 	dev_err(&dev->dev, "Failed to create MSI%s! ret=%d!\n",  in xen_hvm_setup_msi_irqs()
260 		type == PCI_CAP_ID_MSI ? "" : "-X", irq);  in xen_hvm_setup_msi_irqs()
277 		/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,  in xen_initdom_setup_msi_irqs()
285 		map_irq.index = -1;  in xen_initdom_setup_msi_irqs()
286 		map_irq.pirq = -1;  in xen_initdom_setup_msi_irqs()
287 		map_irq.bus = dev->bus->number |  in xen_initdom_setup_msi_irqs()
288 			      (pci_domain_nr(dev->bus) << 16);  in xen_initdom_setup_msi_irqs()
289 		map_irq.devfn = dev->devfn;  in xen_initdom_setup_msi_irqs()
299 			pos = dev->msix_cap;  in xen_initdom_setup_msi_irqs()
305 				return -EINVAL;  in xen_initdom_setup_msi_irqs()
308 			map_irq.entry_nr = msidesc->msi_attrib.entry_nr;  in xen_initdom_setup_msi_irqs()
311 		ret = -EINVAL;  in xen_initdom_setup_msi_irqs()
325 		if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {  in xen_initdom_setup_msi_irqs()
327 			map_irq.index = -1;  in xen_initdom_setup_msi_irqs()
328 			map_irq.pirq = -1;  in xen_initdom_setup_msi_irqs()
329 			map_irq.bus = dev->bus->number;  in xen_initdom_setup_msi_irqs()
332 			if (ret != -EINVAL)  in xen_initdom_setup_msi_irqs()
336 			dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",  in xen_initdom_setup_msi_irqs()
343 		                               (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",  in xen_initdom_setup_msi_irqs()
360 		restore_ext.seg = pci_domain_nr(dev->bus);  in xen_initdom_restore_msi_irqs()
361 		restore_ext.bus = dev->bus->number;  in xen_initdom_restore_msi_irqs()
362 		restore_ext.devfn = dev->devfn;  in xen_initdom_restore_msi_irqs()
365 		if (ret == -ENOSYS)  in xen_initdom_restore_msi_irqs()
367 		WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);  in xen_initdom_restore_msi_irqs()
372 		restore.bus = dev->bus->number;  in xen_initdom_restore_msi_irqs()
373 		restore.devfn = dev->devfn;  in xen_initdom_restore_msi_irqs()
375 		WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);  in xen_initdom_restore_msi_irqs()
389 		if (msidesc->irq) {  in xen_teardown_msi_irqs()
390 			for (i = 0; i < msidesc->nvec_used; i++)  in xen_teardown_msi_irqs()
391 				xen_destroy_irq(msidesc->irq + i);  in xen_teardown_msi_irqs()
400 	if (msidesc->msi_attrib.is_msix)  in xen_pv_teardown_msi_irqs()
408 static int xen_msi_domain_alloc_irqs(struct irq_domain *domain,  in xen_msi_domain_alloc_irqs()  argument
414 		return -EINVAL;  in xen_msi_domain_alloc_irqs()
416 	if (first_msi_entry(dev)->msi_attrib.is_msix)  in xen_msi_domain_alloc_irqs()
424 static void xen_msi_domain_free_irqs(struct irq_domain *domain,  in xen_msi_domain_free_irqs()  argument
443  * This irq domain is a blatant violation of the irq domain design, but
447  * domain pointer in struct device. This irq domain wrappery allows to do
455 	fn = irq_domain_alloc_named_fwnode("XEN-MSI");  in xen_create_pci_msi_domain()
485 	 * Override the PCI/MSI irq domain init function. No point  in xen_setup_pci_msi()
486 	 * in allocating the native domain and never use it.  in xen_setup_pci_msi()
498 		return -ENODEV;  in pci_xen_init()
500 	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");  in pci_xen_init()
567 	 * Pre-allocate the legacy IRQs.  Use NR_LEGACY_IRQS here  in pci_xen_initial_domain()
573 		if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)  in pci_xen_initial_domain()
582 			xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");  in pci_xen_initial_domain()
591 	domid_t domain;  member
604 		if (owner->dev == dev)  in find_device()
613 	int domain = -ENODEV;  in xen_find_device_domain_owner()  local
618 		domain = owner->domain;  in xen_find_device_domain_owner()
620 	return domain;  in xen_find_device_domain_owner()
624 int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)  in xen_register_device_domain_owner()  argument
630 		return -ENODEV;  in xen_register_device_domain_owner()
636 		return -EEXIST;  in xen_register_device_domain_owner()
638 	owner->domain = domain;  in xen_register_device_domain_owner()
639 	owner->dev = dev;  in xen_register_device_domain_owner()
640 	list_add_tail(&owner->list, &dev_domain_list);  in xen_register_device_domain_owner()
654 		return -ENODEV;  in xen_unregister_device_domain_owner()
656 	list_del(&owner->list);  in xen_unregister_device_domain_owner()