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()
178 		return -ENOMEM;  in xen_setup_msi_irqs()
191 					       "pcifront-msi-x" :  in xen_setup_msi_irqs()
192 					       "pcifront-msi",  in xen_setup_msi_irqs()
204 	if (ret == -ENOSYS)  in xen_setup_msi_irqs()
205 		dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");  in xen_setup_msi_irqs()
207 		dev_err(&dev->dev, "Xen PCI frontend error: %d!\n", ret);  in xen_setup_msi_irqs()
222 	msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);  in xen_msi_compose_msg()
223 	msg->address_lo =  in xen_msi_compose_msg()
229 	msg->data = XEN_PIRQ_MSI_DATA;  in xen_msi_compose_msg()
244 			irq = -ENODEV;  in xen_hvm_setup_msi_irqs()
249 		dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);  in xen_hvm_setup_msi_irqs()
253 					       "msi-x" : "msi",  in xen_hvm_setup_msi_irqs()
257 		dev_dbg(&dev->dev,  in xen_hvm_setup_msi_irqs()
258 			"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);  in xen_hvm_setup_msi_irqs()
263 	dev_err(&dev->dev, "Failed to create MSI%s! ret=%d!\n",  in xen_hvm_setup_msi_irqs()
264 		type == PCI_CAP_ID_MSI ? "" : "-X", irq);  in xen_hvm_setup_msi_irqs()
281 		/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,  in xen_initdom_setup_msi_irqs()
289 		map_irq.index = -1;  in xen_initdom_setup_msi_irqs()
290 		map_irq.pirq = -1;  in xen_initdom_setup_msi_irqs()
291 		map_irq.bus = dev->bus->number |  in xen_initdom_setup_msi_irqs()
292 			      (pci_domain_nr(dev->bus) << 16);  in xen_initdom_setup_msi_irqs()
293 		map_irq.devfn = dev->devfn;  in xen_initdom_setup_msi_irqs()
303 			pos = dev->msix_cap;  in xen_initdom_setup_msi_irqs()
309 				return -EINVAL;  in xen_initdom_setup_msi_irqs()
312 			map_irq.entry_nr = msidesc->msi_attrib.entry_nr;  in xen_initdom_setup_msi_irqs()
315 		ret = -EINVAL;  in xen_initdom_setup_msi_irqs()
329 		if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {  in xen_initdom_setup_msi_irqs()
331 			map_irq.index = -1;  in xen_initdom_setup_msi_irqs()
332 			map_irq.pirq = -1;  in xen_initdom_setup_msi_irqs()
333 			map_irq.bus = dev->bus->number;  in xen_initdom_setup_msi_irqs()
336 			if (ret != -EINVAL)  in xen_initdom_setup_msi_irqs()
340 			dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",  in xen_initdom_setup_msi_irqs()
347 		                               (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",  in xen_initdom_setup_msi_irqs()
364 		restore_ext.seg = pci_domain_nr(dev->bus);  in xen_initdom_restore_msi_irqs()
365 		restore_ext.bus = dev->bus->number;  in xen_initdom_restore_msi_irqs()
366 		restore_ext.devfn = dev->devfn;  in xen_initdom_restore_msi_irqs()
369 		if (ret == -ENOSYS)  in xen_initdom_restore_msi_irqs()
371 		WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);  in xen_initdom_restore_msi_irqs()
376 		restore.bus = dev->bus->number;  in xen_initdom_restore_msi_irqs()
377 		restore.devfn = dev->devfn;  in xen_initdom_restore_msi_irqs()
379 		WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);  in xen_initdom_restore_msi_irqs()
393 		if (msidesc->irq) {  in xen_teardown_msi_irqs()
394 			for (i = 0; i < msidesc->nvec_used; i++)  in xen_teardown_msi_irqs()
395 				xen_destroy_irq(msidesc->irq + i);  in xen_teardown_msi_irqs()
404 	if (msidesc->msi_attrib.is_msix)  in xen_pv_teardown_msi_irqs()
412 static int xen_msi_domain_alloc_irqs(struct irq_domain *domain,  in xen_msi_domain_alloc_irqs()  argument
418 		return -EINVAL;  in xen_msi_domain_alloc_irqs()
420 	if (first_msi_entry(dev)->msi_attrib.is_msix)  in xen_msi_domain_alloc_irqs()
428 static void xen_msi_domain_free_irqs(struct irq_domain *domain,  in xen_msi_domain_free_irqs()  argument
447  * This irq domain is a blatant violation of the irq domain design, but
451  * domain pointer in struct device. This irq domain wrappery allows to do
459 	fn = irq_domain_alloc_named_fwnode("XEN-MSI");  in xen_create_pci_msi_domain()
488 	 * Override the PCI/MSI irq domain init function. No point  in xen_setup_pci_msi()
489 	 * in allocating the native domain and never use it.  in xen_setup_pci_msi()
493 	 * With XEN PIRQ/Eventchannels in use PCI/MSI[-X] masking is solely  in xen_setup_pci_msi()
506 		return -ENODEV;  in pci_xen_init()
508 	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");  in pci_xen_init()
575 	 * Pre-allocate the legacy IRQs.  Use NR_LEGACY_IRQS here  in pci_xen_initial_domain()
581 		if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)  in pci_xen_initial_domain()
590 			xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");  in pci_xen_initial_domain()
596 	domid_t domain;  member
609 		if (owner->dev == dev)  in find_device()
618 	int domain = -ENODEV;  in xen_find_device_domain_owner()  local
623 		domain = owner->domain;  in xen_find_device_domain_owner()
625 	return domain;  in xen_find_device_domain_owner()
629 int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)  in xen_register_device_domain_owner()  argument
635 		return -ENODEV;  in xen_register_device_domain_owner()
641 		return -EEXIST;  in xen_register_device_domain_owner()
643 	owner->domain = domain;  in xen_register_device_domain_owner()
644 	owner->dev = dev;  in xen_register_device_domain_owner()
645 	list_add_tail(&owner->list, &dev_domain_list);  in xen_register_device_domain_owner()
659 		return -ENODEV;  in xen_unregister_device_domain_owner()
661 	list_del(&owner->list);  in xen_unregister_device_domain_owner()