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 xen_hvm_register_pirq(u32 gsi, int triggering)
26 struct physdev_map_pirq map_irq;
30 if (!xen_hvm_domain())
33 map_irq.domid = DOMID_SELF;
34 map_irq.type = MAP_PIRQ_TYPE_GSI;
38 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
40 printk(KERN_WARNING "xen map irq failed %d\n", rc);
44 if (triggering == ACPI_EDGE_SENSITIVE) {
49 name = "ioapic-level";
52 irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
54 printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
59 static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
60 int trigger, int polarity)
62 return xen_hvm_register_pirq(gsi, trigger);
66 #if defined(CONFIG_PCI_MSI)
67 #include <linux/msi.h>
68 #include <asm/msidef.h>
70 struct xen_pci_frontend_ops *xen_pci_frontend;
71 EXPORT_SYMBOL_GPL(xen_pci_frontend);
73 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
76 /* We set vector == 0 to tell the hypervisor we don't care about it,
77 * but we want a pirq setup instead.
78 * We use the dest_id field to pass the pirq that we want. */
79 msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
82 MSI_ADDR_DEST_MODE_PHYSICAL |
83 MSI_ADDR_REDIRECTION_CPU |
84 MSI_ADDR_DEST_ID(pirq);
87 MSI_DATA_TRIGGER_EDGE |
88 MSI_DATA_LEVEL_ASSERT |
89 /* delivery mode reserved */
94 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
96 int irq, pirq, ret = 0;
97 struct msi_desc *msidesc;
100 list_for_each_entry(msidesc, &dev->msi_list, list) {
101 xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
102 "msi-x" : "msi", &irq, &pirq);
103 if (irq < 0 || pirq < 0)
105 printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
106 xen_msi_compose_msg(dev, pirq, &msg);
107 ret = set_irq_msi(irq, msidesc);
110 write_msi_msg(irq, &msg);
115 unbind_from_irqhandler(irq, NULL);
118 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
119 " MSI/MSI-X support!\n");
125 * For MSI interrupts we have to use drivers/xen/event.s functions to
126 * allocate an irq_desc and setup the right */
129 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
132 struct msi_desc *msidesc;
135 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
139 if (type == PCI_CAP_ID_MSIX)
140 ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
142 ret = xen_pci_frontend_enable_msi(dev, &v);
146 list_for_each_entry(msidesc, &dev->msi_list, list) {
147 irq = xen_allocate_pirq(v[i], 0, /* not sharable */
148 (type == PCI_CAP_ID_MSIX) ?
149 "pcifront-msi-x" : "pcifront-msi");
153 ret = set_irq_msi(irq, msidesc);
162 unbind_from_irqhandler(irq, NULL);
165 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
166 " MSI/MSI-X support!\n");
172 static void xen_teardown_msi_irqs(struct pci_dev *dev)
174 struct msi_desc *msidesc;
176 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
177 if (msidesc->msi_attrib.is_msix)
178 xen_pci_frontend_disable_msix(dev);
180 xen_pci_frontend_disable_msi(dev);
183 static void xen_teardown_msi_irq(unsigned int irq)
185 xen_destroy_irq(irq);
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 irq = xen_create_msi_irq(dev, msidesc, type);
198 ret = set_irq_msi(irq, msidesc);
205 xen_destroy_irq(irq);
210 static int xen_pcifront_enable_irq(struct pci_dev *dev)
215 dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
220 if (dev->irq < NR_IRQS_LEGACY)
223 rc = xen_allocate_pirq(dev->irq, share, "pcifront");
225 dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
232 int __init pci_xen_init(void)
234 if (!xen_pv_domain() || xen_initial_domain())
237 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
239 pcibios_set_cache_line_size();
241 pcibios_enable_irq = xen_pcifront_enable_irq;
242 pcibios_disable_irq = NULL;
245 /* Keep ACPI out of the picture */
249 #ifdef CONFIG_PCI_MSI
250 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
251 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
252 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
257 int __init pci_xen_hvm_init(void)
259 if (!xen_feature(XENFEAT_hvm_pirqs))
264 * We don't want to change the actual ACPI delivery model,
265 * just how GSIs get registered.
267 __acpi_register_gsi = acpi_register_gsi_xen_hvm;
270 #ifdef CONFIG_PCI_MSI
271 x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
272 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
277 #ifdef CONFIG_XEN_DOM0
278 static int xen_register_pirq(u32 gsi, int triggering)
281 struct physdev_map_pirq map_irq;
285 if (!xen_pv_domain())
288 if (triggering == ACPI_EDGE_SENSITIVE) {
290 name = "ioapic-edge";
293 name = "ioapic-level";
296 irq = xen_allocate_pirq(gsi, shareable, name);
298 printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
303 map_irq.domid = DOMID_SELF;
304 map_irq.type = MAP_PIRQ_TYPE_GSI;
308 rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
310 printk(KERN_WARNING "xen map irq failed %d\n", rc);
318 static int xen_register_gsi(u32 gsi, int triggering, int polarity)
321 struct physdev_setup_gsi setup_gsi;
323 if (!xen_pv_domain())
326 printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
327 gsi, triggering, polarity);
329 irq = xen_register_pirq(gsi, triggering);
332 setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
333 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
335 rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
337 printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
339 printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
346 static __init void xen_setup_acpi_sci(void)
349 int trigger, polarity;
350 int gsi = acpi_sci_override_gsi;
355 rc = acpi_get_override_irq(gsi, &trigger, &polarity);
357 printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
358 " sci, rc=%d\n", rc);
361 trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
362 polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
364 printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
365 "polarity=%d\n", gsi, trigger, polarity);
367 gsi = xen_register_gsi(gsi, trigger, polarity);
368 printk(KERN_INFO "xen: acpi sci %d\n", gsi);
373 static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
374 int trigger, int polarity)
376 return xen_register_gsi(gsi, trigger, polarity);
379 static int __init pci_xen_initial_domain(void)
381 #ifdef CONFIG_PCI_MSI
382 x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
383 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
385 xen_setup_acpi_sci();
386 __acpi_register_gsi = acpi_register_gsi_xen;
391 void __init xen_setup_pirqs(void)
395 pci_xen_initial_domain();
397 if (0 == nr_ioapics) {
398 for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
399 xen_allocate_pirq(irq, 0, "xt-pic");
403 /* Pre-allocate legacy irqs */
404 for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
405 int trigger, polarity;
407 if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
410 xen_register_pirq(irq,
411 trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);