2 * Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
3 * x86 PCI core to support the Xen PCI Frontend
5 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
7 #include <linux/module.h>
8 #include <linux/init.h>
10 #include <linux/acpi.h>
13 #include <asm/io_apic.h>
14 #include <asm/pci_x86.h>
16 #include <asm/xen/hypervisor.h>
18 #include <xen/features.h>
19 #include <xen/events.h>
20 #include <asm/xen/pci.h>
23 static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
24 int trigger, int polarity)
27 struct physdev_map_pirq map_irq;
31 if (!xen_hvm_domain())
34 map_irq.domid = DOMID_SELF;
35 map_irq.type = MAP_PIRQ_TYPE_GSI;
39 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
41 printk(KERN_WARNING "xen map irq failed %d\n", rc);
45 if (trigger == ACPI_EDGE_SENSITIVE) {
50 name = "ioapic-level";
53 irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
55 printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
61 #if defined(CONFIG_PCI_MSI)
62 #include <linux/msi.h>
63 #include <asm/msidef.h>
65 struct xen_pci_frontend_ops *xen_pci_frontend;
66 EXPORT_SYMBOL_GPL(xen_pci_frontend);
68 #define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
69 MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
71 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
74 /* We set vector == 0 to tell the hypervisor we don't care about it,
75 * but we want a pirq setup instead.
76 * We use the dest_id field to pass the pirq that we want. */
77 msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
80 MSI_ADDR_DEST_MODE_PHYSICAL |
81 MSI_ADDR_REDIRECTION_CPU |
82 MSI_ADDR_DEST_ID(pirq);
84 msg->data = XEN_PIRQ_MSI_DATA;
87 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
90 struct msi_desc *msidesc;
93 list_for_each_entry(msidesc, &dev->msi_list, list) {
94 __read_msi_msg(msidesc, &msg);
95 pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
96 ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
97 if (msg.data != XEN_PIRQ_MSI_DATA ||
98 xen_irq_from_pirq(pirq) < 0) {
99 pirq = xen_allocate_pirq_msi(dev, msidesc);
102 xen_msi_compose_msg(dev, pirq, &msg);
103 __write_msi_msg(msidesc, &msg);
104 dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
107 "xen: msi already bound to pirq=%d\n", pirq);
109 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
110 (type == PCI_CAP_ID_MSIX) ?
116 "xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
122 "Xen PCI frontend has not registered MSI/MSI-X support!\n");
127 * For MSI interrupts we have to use drivers/xen/event.s functions to
128 * allocate an irq_desc and setup the right */
131 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
134 struct msi_desc *msidesc;
137 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
141 if (type == PCI_CAP_ID_MSIX)
142 ret = xen_pci_frontend_enable_msix(dev, v, nvec);
144 ret = xen_pci_frontend_enable_msi(dev, v);
148 list_for_each_entry(msidesc, &dev->msi_list, list) {
149 irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
150 (type == PCI_CAP_ID_MSIX) ?
162 dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
168 static void xen_teardown_msi_irqs(struct pci_dev *dev)
170 struct msi_desc *msidesc;
172 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
173 if (msidesc->msi_attrib.is_msix)
174 xen_pci_frontend_disable_msix(dev);
176 xen_pci_frontend_disable_msi(dev);
178 /* Free the IRQ's and the msidesc using the generic code. */
179 default_teardown_msi_irqs(dev);
182 static void xen_teardown_msi_irq(unsigned int irq)
184 xen_destroy_irq(irq);
187 #ifdef CONFIG_XEN_DOM0
188 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
191 struct msi_desc *msidesc;
193 list_for_each_entry(msidesc, &dev->msi_list, list) {
194 struct physdev_map_pirq map_irq;
197 domid = ret = xen_find_device_domain_owner(dev);
198 /* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
199 * hence check ret value for < 0. */
203 memset(&map_irq, 0, sizeof(map_irq));
204 map_irq.domid = domid;
205 map_irq.type = MAP_PIRQ_TYPE_MSI;
208 map_irq.bus = dev->bus->number;
209 map_irq.devfn = dev->devfn;
211 if (type == PCI_CAP_ID_MSIX) {
213 u32 table_offset, bir;
215 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
217 pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
219 bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
221 map_irq.table_base = pci_resource_start(dev, bir);
222 map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
225 ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
227 dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
232 ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
233 map_irq.pirq, map_irq.index,
234 (type == PCI_CAP_ID_MSIX) ?
247 static int xen_pcifront_enable_irq(struct pci_dev *dev)
254 rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
256 dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
261 rc = xen_allocate_pirq_gsi(gsi);
263 dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
269 if (gsi < NR_IRQS_LEGACY)
272 rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
274 dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
280 dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
284 int __init pci_xen_init(void)
286 if (!xen_pv_domain() || xen_initial_domain())
289 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
291 pcibios_set_cache_line_size();
293 pcibios_enable_irq = xen_pcifront_enable_irq;
294 pcibios_disable_irq = NULL;
297 /* Keep ACPI out of the picture */
301 #ifdef CONFIG_PCI_MSI
302 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
303 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
304 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
309 int __init pci_xen_hvm_init(void)
311 if (!xen_feature(XENFEAT_hvm_pirqs))
316 * We don't want to change the actual ACPI delivery model,
317 * just how GSIs get registered.
319 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
322 #ifdef CONFIG_PCI_MSI
323 x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
324 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
329 #ifdef CONFIG_XEN_DOM0
330 static int xen_register_pirq(u32 gsi, int triggering)
332 int rc, pirq, irq = -1;
333 struct physdev_map_pirq map_irq;
336 bool gsi_override = false;
338 if (!xen_pv_domain())
341 if (triggering == ACPI_EDGE_SENSITIVE) {
343 name = "ioapic-edge";
346 name = "ioapic-level";
349 pirq = xen_allocate_pirq_gsi(gsi);
353 /* Before we bind the GSI to a Linux IRQ, check whether
354 * we need to override it with bus_irq (IRQ) value. Usually for
355 * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
356 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
357 * but there are oddballs where the IRQ != GSI:
358 * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
359 * which ends up being: gsi_to_irq[9] == 20
360 * (which is what acpi_gsi_to_irq ends up calling when starting the
361 * the ACPI interpreter and keels over since IRQ 9 has not been
362 * setup as we had setup IRQ 20 for it).
364 if (gsi == acpi_sci_override_gsi) {
365 /* Check whether the GSI != IRQ */
366 acpi_gsi_to_irq(gsi, &irq);
368 /* Bugger, we MUST have that IRQ. */
372 irq = xen_bind_pirq_gsi_to_irq(irq, pirq, shareable, name);
374 irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
378 printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", pirq, irq, gsi);
380 map_irq.domid = DOMID_SELF;
381 map_irq.type = MAP_PIRQ_TYPE_GSI;
385 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
387 printk(KERN_WARNING "xen map irq failed %d\n", rc);
395 static int xen_register_gsi(u32 gsi, int triggering, int polarity)
398 struct physdev_setup_gsi setup_gsi;
400 if (!xen_pv_domain())
403 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
404 gsi, triggering, polarity);
406 irq = xen_register_pirq(gsi, triggering);
409 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
410 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
412 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
414 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
416 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
423 static __init void xen_setup_acpi_sci(void)
426 int trigger, polarity;
427 int gsi = acpi_sci_override_gsi;
432 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
434 printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
435 " sci, rc=%d\n", rc);
438 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
439 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
441 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
442 "polarity=%d\n", gsi, trigger, polarity);
444 gsi = xen_register_gsi(gsi, trigger, polarity);
445 printk(KERN_INFO "xen: acpi sci %d\n", gsi);
450 static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
451 int trigger, int polarity)
453 return xen_register_gsi(gsi, trigger, polarity);
456 static int __init pci_xen_initial_domain(void)
458 #ifdef CONFIG_PCI_MSI
459 x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
460 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
462 xen_setup_acpi_sci();
463 __acpi_register_gsi = acpi_register_gsi_xen;
468 void __init xen_setup_pirqs(void)
472 pci_xen_initial_domain();
474 if (0 == nr_ioapics) {
475 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
476 pirq = xen_allocate_pirq_gsi(irq);
478 "Could not allocate PIRQ for legacy interrupt\n"))
480 irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
485 /* Pre-allocate legacy irqs */
486 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
487 int trigger, polarity;
489 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
492 xen_register_pirq(irq,
493 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
498 #ifdef CONFIG_XEN_DOM0
499 struct xen_device_domain_owner {
502 struct list_head list;
505 static DEFINE_SPINLOCK(dev_domain_list_spinlock);
506 static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
508 static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
510 struct xen_device_domain_owner *owner;
512 list_for_each_entry(owner, &dev_domain_list, list) {
513 if (owner->dev == dev)
519 int xen_find_device_domain_owner(struct pci_dev *dev)
521 struct xen_device_domain_owner *owner;
522 int domain = -ENODEV;
524 spin_lock(&dev_domain_list_spinlock);
525 owner = find_device(dev);
527 domain = owner->domain;
528 spin_unlock(&dev_domain_list_spinlock);
531 EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
533 int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
535 struct xen_device_domain_owner *owner;
537 owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
541 spin_lock(&dev_domain_list_spinlock);
542 if (find_device(dev)) {
543 spin_unlock(&dev_domain_list_spinlock);
547 owner->domain = domain;
549 list_add_tail(&owner->list, &dev_domain_list);
550 spin_unlock(&dev_domain_list_spinlock);
553 EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
555 int xen_unregister_device_domain_owner(struct pci_dev *dev)
557 struct xen_device_domain_owner *owner;
559 spin_lock(&dev_domain_list_spinlock);
560 owner = find_device(dev);
562 spin_unlock(&dev_domain_list_spinlock);
565 list_del(&owner->list);
566 spin_unlock(&dev_domain_list_spinlock);
570 EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);